Anti-seepage construction method for joint of underground diaphragm wall adjacent to metro site
By using fluid solidified soil at the underground continuous wall joints, and using raw materials such as slag to form a solidified body, the problem of high cement grouting cost is solved, and efficient and low-cost anti-seepage effect and construction quality improvement is achieved.
Patent Information
- Application Number
- CN202510517399.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-08-01
AI Technical Summary
The use of cement grouting sealing at the underground continuous wall joints close to the subway site has the problem of high construction costs and limited results.
Using the construction method of fluid solidified soil, a mixture composed of slag, cement, slag powder, desulfurization gypsum, fly ash, silicon powder, retarder and water glass is formed by drilling holes at the joints at high pressure to inject a mixture of slag, cement, slag powder, and desulfurization gypsum, fly ash, silicon powder, retarder and water glass into a solidified body that is integrated with the underground continuous wall.
It significantly improves the anti-seepage effect at the joints, reduces construction costs, reduces the transportation of slag, and improves construction efficiency and hole-forming quality.
Smart Images
Figure CN120401462A_ABST
Abstract
Description
Technical Field
[0001] This invention patent relates to the technical field of diaphragm walls, specifically, an anti-seepage construction method at the joint of diaphragm walls adjacent to subway sites. Background Art
[0002] In recent years, new first-tier and super first-tier cities have emerged. In these cities, the construction of subways has developed rapidly and grown exponentially. Due to the particularity and importance of subways, the construction within a 50-meter radius around the subway (referred to as the subway protection area) is extremely cautious and strict. Due to the limited available urban area, in a large number of engineering constructions, it is inevitable to carry out operations within the subway protection area, which greatly increases the operation difficulty and importance during the construction of similar projects.
[0003] As a protective structure, diaphragm walls are widely used in the engineering construction of relevant lines adjacent to subway sites in recent years because of their large stiffness, good integrity, anti-seepage property, and durability.
[0004] The diaphragm wall is constructed in segments. The first segment and the subsequent segments are connected by I-beams, that is, the joint of the diaphragm wall. During the actual construction process, since the I-beams are poured separately with the first segment and the subsequent segments, and not formed in one go, it is easy to have quality problems such as water leakage and non-water permeability.
[0005] For projects adjacent to subway sites, the importance of the structural stability of the diaphragm wall is self-evident, and it is required to have sufficient stability and high anti-seepage property. After the traditional diaphragm wall construction, the joint is prone to water leakage, which is absolutely prohibited in subway lines. Therefore, in the construction of projects adjacent to subway sites, the anti-seepage project at the joint of the diaphragm wall is extremely important. In the prior art, cement grouting is generally used for plugging, but the effect is limited and the cost is relatively high. Summary of the Invention
[0006] The purpose of the present invention is to provide an anti-seepage construction method at the joint of diaphragm walls adjacent to subway sites, aiming to solve the problem of high construction cost in the prior art when using cement grouting to plug the joint of diaphragm walls adjacent to subway sites.
[0007] The present invention is realized as follows. The anti-seepage construction method at the joint of diaphragm walls adjacent to subway sites includes the following construction steps:
[0008] 1), Collect the muck generated during the construction of the diaphragm wall at the construction site;
[0009] 2), According to the set mass ratio, add muck, cement, slag powder, desulfurized gypsum, fly ash, silica fume, retarder and water into a mixing tank for stirring and mixing to form a mixture;
[0010] 3), Add sodium silicate into the mixing tank, and stir and mix the mixture with sodium silicate to form fluid solidified soil;
[0011] 4), Level the construction site, level the upper part of the diaphragm wall, and determine the joint of the diaphragm wall;
[0012] 5), A drill bit is connected to the drill pipe, and the drill bit is used to drill at the joint to form a grouting hole. A grouting pipe is formed in the drill pipe, and the grouting pipe has a slurry outlet, and the slurry outlet is formed below the drill bit;
[0013] 6), When the drill bit drills to the bottom of the grouting hole, the slurry outlet is located at the bottom of the grouting hole. Through the grouting pipe, inject fluid solidified soil into the grouting hole under high pressure. The fluid solidified soil penetrates to the outer periphery of the joint to form a consolidation body integrated with the diaphragm wall.
[0014] Further, in the construction step 1), screen the muck and remove the sand and gravel with a particle size greater than 2 mm.
[0015] Further, in the construction step 1), place the screened muck in a storage tank, inject water into the storage tank, mix the water with the muck, and foam the muck with a disperser.
[0016] Further, by mass ratio, the cement accounts for 12%-20% of the fluid solidified soil, the muck accounts for 40%-60% of the fluid solidified soil, the slag powder accounts for 5%-8% of the fluid solidified soil, the desulfurized gypsum accounts for 10%-12% of the fluid solidified soil, the fly ash accounts for 6%-9% of the fluid solidified soil, the silica fume accounts for 3%-8% of the fluid solidified soil, the retarder accounts for 1%-3% of the fluid solidified soil, and the sodium silicate accounts for 1%-2% of the fluid solidified soil.
[0017] Further, in the construction step 1), the cement used is ordinary Portland cement 42.5.
[0018] Further, in the construction step 1), the gypsum is desulfurized gypsum.
[0019] Further, in the construction step 1), the silica fume is formed by collecting and processing the smoke and dust escaping with the waste gas during the high-temperature smelting of industrial silicon and ferrosilicon in an industrial electric furnace, and the content of silicon dioxide in the silica fume is greater than 85%.
[0020] Further, the retarder is sucrose, sodium gluconate or sodium hexametaphosphate.
[0021] Further, in the construction step 6), the drill bit drills to the bottom of the grouting hole, and after injecting the fluidized solidified soil into the bottom of the grouting hole through the grouting pipe for a set time, the drill pipe is rotated reversely, and the drill pipe is lifted upward. The slurry outlet is lifted synchronously, and the grouting pipe injects the fluidized solidified soil into the grouting hole at high pressure through the slurry outlet until the drill bit disengages from the grouting hole.
[0022] Further, in the construction step 1), the muck is placed in a drum screen. The drum screen includes a horizontally rolling drum. A plurality of sieve holes are provided on the outer periphery of the drum, and a horizontal cavity is provided inside the drum.
[0023] A plurality of rolling rings are provided in the horizontal cavity. The plurality of rolling rings are arranged at intervals along the axial direction of the drum, and the rolling rings are arranged in a circumferential direction around the drum. The outer periphery of the rolling ring is rotatably connected to the drum, and an annular plate is provided inside the rolling ring. Adjacent rolling rings are connected by a plurality of elastic strips. The plurality of elastic strips are arranged at intervals in the circumferential direction around the drum, and the elastic strips are arranged obliquely along the axial direction of the drum.
[0024] In the construction step 1), after the muck is placed in the horizontal cavity, the drum rolls horizontally, and the plurality of rolling rings rotate synchronously relative to the drum. During the rotation of adjacent drums, the plurality of elastic strips are elastically deformed, and reversely drive the rolling rings to rotate back to their original positions, so that the plurality of rolling rings reciprocally stir the muck in the horizontal cavity.
[0025] Compared with the prior art, the anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site provided by the present invention has the following advantages:
[0026] 1) The fluidized solidified soil is prepared from cement, muck, slag micro-powder, desulfurized gypsum, fly ash, silica fume, retarder and water glass. By using the muck collected on site as the main material of the fluidized solidified soil, and through the solidification treatment of cement, slag micro-powder, desulfurized gypsum and fly ash, at the same time, silica fume is supplemented to improve its strength, impermeability, abrasion resistance and other properties. Through the coordinated action of each component, the solidification and anti-seepage effect of the fluidized solidified soil can be significantly improved, meeting the construction requirements of the diaphragm wall.
[0027] 2) Using the muck excavated on site during the construction of the diaphragm wall as the main component of the fluidized solidified soil can large-scale dispose of the muck generated in urban construction, providing a new idea for muck treatment, enabling it to be resourcefully, green and pollution-free utilized, reducing the cost of muck transportation, and greatly reducing the construction cost.
[0028] 3) The retarder and sodium silicate used can ensure the fluidity of the fluidized solidified soil during the grouting process. After reaching the grouting position, while rapidly increasing the strength, the anti-seepage effect is greatly enhanced, ensuring its normal service performance.
[0029] 4) After drilling, the grouting pipe in the drill pipe can be directly used for grouting without the need for mud wall protection. This can ensure a clean and tidy construction site while greatly improving work efficiency. Seepage prevention is carried out based on the specific position after the construction of the diaphragm wall in the early stage, with more precise construction and high hole-forming quality, so it is suitable for popularization. Description of the Drawings
[0030] Figure 1 is a schematic flow chart of the anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site provided by the present invention;
[0031] Figure 2 is a sectional view of the drum screen provided by the present invention. Detailed Embodiments
[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0033] The implementation of the present invention will be described in detail below with reference to specific embodiments.
[0034] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0035] Refer to Figure 1-2 as shown, which is a preferred embodiment provided by the present invention.
[0036] The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site includes the following construction steps:
[0037] 1) Collect the muck generated during the construction of the diaphragm wall at the construction site;
[0038] 2), According to the set mass ratio, add muck, cement, slag powder, desulfurized gypsum, fly ash, silica fume, retarder and water into the mixing tank and stir to form a mixture;
[0039] 3), Add sodium silicate into the mixing tank, and stir and mix the mixture with sodium silicate to form fluid solidified soil;
[0040] 4), Level the construction site, level the upper part of the diaphragm wall, and determine the joint of the diaphragm wall;
[0041] 5), A drill bit is connected to the drill pipe, and the drill bit is used to drill at the joint to form a grouting hole. A grouting pipe is formed in the drill pipe, and the grouting pipe has a slurry outlet, and the slurry outlet is formed below the drill bit;
[0042] 6), When the drill bit drills to the bottom of the grouting hole, the slurry outlet is located at the bottom of the grouting hole. Through the grouting pipe, fluid solidified soil is injected into the grouting hole under high pressure, and the fluid solidified soil penetrates to the outer periphery of the joint to form a consolidation body integrated with the diaphragm wall.
[0043] The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site provided above has the following advantages:
[0044] 1), The fluid solidified soil is prepared from cement, muck, slag powder, desulfurized gypsum, fly ash, silica fume, retarder and sodium silicate. By using the muck collected on-site as the main material of the fluid solidified soil and solidifying it with cement, slag powder, desulfurized gypsum and fly ash, at the same time, silica fume is used to improve its strength, impermeability, abrasion resistance and other properties. Through the coordinated action of each component, the solidification and anti-seepage effect of the fluid solidified soil can be significantly improved, meeting the construction requirements of the diaphragm wall;
[0045] 2), Using the muck excavated on-site during the construction of the diaphragm wall as the main component of the fluid solidified soil can large-scale dispose of the muck generated in urban construction, providing a new idea for muck treatment, enabling it to be resourcefully, green and pollution-free utilized, reducing the cost of muck transportation, and greatly reducing the construction cost;
[0046] 3), The retarder and sodium silicate used can ensure the fluidity of the fluid solidified soil during the grouting process. After reaching the grouting position, while quickly increasing the strength, the anti-seepage effect is greatly increased, ensuring its normal service performance;
[0047] 4), After the drill pipe drills, the grouting pipe in the drill pipe can be directly used for grouting without the need for slurry wall protection. It can ensure a clean and tidy construction site while greatly improving work efficiency. The anti-seepage is carried out according to the specific position after the previous diaphragm wall construction, the construction is more precise, and the hole-forming quality is high, so it is suitable for popularization.
[0048] In this embodiment, the components in the fluidized solidified soil interact with each other in a coordinated manner, significantly improving the solidification effect and solidification rate. After grouting construction treatment at the joint of the diaphragm wall, it can enhance the anti-seepage treatment effect at the joint.
[0049] The main reason for the reaction principle of the fluidized solidified soil is that chemical reactions such as hydration reaction, ion exchange reaction, pozzolanic reaction, and carbonation reaction occur. The muck belongs to clay, and the soil particles in it are neutrally charged, with the particle surface being negatively charged. Under the action of static gravitational force, a double electric layer corresponding to a negatively charged layer and a positively charged layer of hydrated cations will form on the surface of the muck. The attracted cations will move in the opposite direction due to the molecular concentration gradient and thermal motion. During the cation adsorption motion and diffusion motion, a hydrated cation layer in a diffusion state will form on the surface of the muck particles. This state is the double electric layer of the muck. After adding the curing agent, the cations increase, and cations with high charge amounts such as Ca2+ and Al3+ replace the previous cations such as Na+, making the double electric layer thickness thinner and the distance between clay particles shorter. The plasticity of the solidified soil body decreases and the strength increases. Thus, a "skeleton" formed by a series of hydration reactions is filled.
[0050] Generally speaking, an overall "skeleton" framework is built based on hydration reactions, etc. Subsequently, ion exchange, hardening reaction, and carbonation reaction continue to occur to fill its "skeleton", weakening the double electric layer, etc. This enables its strength to increase and meet the requirements. The addition of additives such as water glass makes the structure more compact. The water permeability is greatly reduced, and the anti-seepage performance is greatly improved.
[0051] In this embodiment, in construction step 1), the muck is screened to remove sand and gravel with a particle size greater than 2 mm. The muck can be first crushed and then placed in a rotary screen for rolling screening to remove sand and gravel with a particle size greater than 2 mm in the muck.
[0052] In this embodiment, in construction step 1), the screened muck is placed in a storage tank, water is injected into the storage tank, and the water is mixed with the muck to foam the muck with a disperser.
[0053] In this embodiment, by mass ratio, cement accounts for 12% - 20% of the fluidized solidified soil, muck accounts for 40% - 60% of the fluidized solidified soil, slag micro-powder accounts for 5% - 8% of the fluidized solidified soil, desulfurized gypsum accounts for 10% - 12% of the fluidized solidified soil, fly ash accounts for 6% - 9% of the fluidized solidified soil, silica fume accounts for 3% - 8% of the fluidized solidified soil, retarder accounts for 1% - 3% of the fluidized solidified soil, and water glass accounts for 1% - 2% of the fluidized solidified soil.
[0054] In this embodiment, in construction step 1), ordinary Portland cement 42.5 is used as the cement.
[0055] In this embodiment, in construction step 1), the gypsum is desulfurized gypsum.
[0056] In this embodiment, in construction step 1), the silica fume is formed by collecting and processing the soot escaping with the waste gas during the high-temperature smelting of industrial silicon and ferrosilicon in an industrial electric furnace, and the content of silicon dioxide in the silica fume is greater than 85%.
[0057] In this embodiment, the retarder is sucrose or sodium gluconate or sodium hexametaphosphate. The appearance of the water glass is a colorless, slightly colored semi-transparent or transparent viscous liquid, and the modulus of the water glass should be controlled between 2.6 and 3.0.
[0058] In this embodiment, in construction step 6), the drill bit drills to the bottom of the grouting hole, and after injecting the fluidized solidified soil into the bottom of the grouting hole through the grouting pipe for a set time, the drill pipe is rotated reversely and the drill pipe is lifted upward, and the slurry outlet is lifted synchronously, and the grouting pipe injects the fluidized solidified soil into the grouting hole at high pressure through the slurry outlet until the drill bit disengages from the grouting hole.
[0059] After injecting the fluidized solidified soil into the bottom of the grouting hole, rotating the drill pipe reversely can better clean the grouting hole, so that the fluidized solidified soil can fill the grouting hole. And during the process of rotating the drill pipe reversely, the drill pipe is lifted synchronously and the fluidized solidified soil is injected synchronously. In this way, grouting in the whole range of the grouting hole can be realized.
[0060] In this embodiment, in construction step 1), the muck is placed in a drum sieve. The drum sieve includes a drum 100 arranged horizontally and rolling, and a plurality of sieve holes are provided on the outer periphery of the drum 100, and a horizontal cavity 101 is provided inside the drum 100;
[0061] A plurality of rolling rings 200 are provided in the horizontal cavity 101. The plurality of rolling rings 200 are arranged at intervals along the axial direction of the drum 100, and the rolling rings 200 are arranged in a circumferential direction around the drum 100; the outer periphery of the rolling ring 200 is rotatably connected to the drum 100, and an annular plate 201 is provided inside the rolling ring 200; adjacent rolling rings 200 are connected by a plurality of elastic strips 300. The plurality of elastic strips 300 are arranged at intervals in the circumferential direction around the drum 100, and the elastic strips 300 are arranged obliquely along the axial direction of the drum 100.
[0062] In construction step 1), after the muck is placed in the horizontal cavity 101, the drum 100 rolls horizontally, and the plurality of rolling rings 200 rotate synchronously relative to the drum 100. During the rotation of adjacent drums 100, the plurality of elastic strips 300 are elastically deformed, and reversely drive the rolling rings 200 to rotate back to their original positions, so that the plurality of rolling rings 200 reciprocally stir the muck in the horizontal cavity 101.
[0063] When the muck rolls horizontally along with the roller 100, multiple rolling rings 200 rotate reciprocally, using the annular plate 201 to stir the muck and capable of crushing the muck. During the process of stirring the muck, the muck is further crushed to achieve more efficient screening of the muck.
[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site is characterized in that, It includes the following construction steps: 1), Collect the muck generated during the construction process of the diaphragm wall at the construction site; 2), According to the set mass ratio, add the muck, cement, slag powder, desulfurized gypsum, fly ash, silica fume, retarder and water into a mixing tank for stirring and mixing to form a mixture; 3), Add sodium silicate into the mixing tank, and stir and mix the mixture with sodium silicate to form a fluid solidified soil; 4), Level the construction site, level the upper part of the diaphragm wall, and determine the joint of the diaphragm wall; 5), A drill bit is connected to the drill pipe, and the drill bit is used to drill at the joint to form a grouting hole. A grouting pipe is formed in the drill pipe, and the grouting pipe has a slurry outlet, and the slurry outlet is formed below the drill bit; 6), When the drill bit drills to the bottom of the grouting hole, the slurry outlet is located at the bottom of the grouting hole. Through the grouting pipe, the fluid solidified soil is injected into the grouting hole under high pressure, and the fluid solidified soil penetrates to the outer periphery of the joint to form a consolidation body integrated with the diaphragm wall.
2. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site as described in claim 1, characterized in that, In the construction step 1), the muck is screened to remove the sand and gravel with a particle size greater than 2mm.
3. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site as described in claim 2, characterized in that, In the construction step 1), the screened muck is placed in a storage tank, and water is injected into the storage tank. The water is mixed with the muck, and the muck is foamed by a disperser.
4. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, By mass ratio, the cement accounts for 12%-20% of the fluid solidified soil, the muck accounts for 40%-60% of the fluid solidified soil, the slag powder accounts for 5%-8% of the fluid solidified soil, the desulfurized gypsum accounts for 10%-12% of the fluid solidified soil, the fly ash accounts for 6%-9% of the fluid solidified soil, the silica fume accounts for 3%-8% of the fluid solidified soil, the retarder accounts for 1%-3% of the fluid solidified soil, and the sodium silicate accounts for 1%-2% of the fluid solidified soil.
5. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, In the construction step 1), the cement used is ordinary Portland cement 42.
5.
6. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, In the construction step 1), the gypsum is desulfurized gypsum.
7. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, In the construction step 1), the silica fume is formed by collecting and processing the dust escaping with the waste gas during the high-temperature smelting of industrial silicon and ferrosilicon in an industrial electric furnace, and the content of silicon dioxide in the silica fume is greater than 85%.
8. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, The retarder is sucrose or sodium gluconate or sodium hexametaphosphate.
9. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, In the construction step 6), when the drill bit drills to the bottom of the grouting hole and injects the fluid solidified soil into the bottom of the grouting hole through the grouting pipe for a set time, the drill pipe is rotated reversely and the drill pipe is lifted upwards, the slurry outlet is lifted synchronously, and the grouting pipe injects the fluid solidified soil into the grouting hole under high pressure through the slurry outlet until the drill bit disengages from the grouting hole.
10. The anti-seepage construction method at the joint of the diaphragm wall adjacent to the subway site according to any one of claims 1 to 3, characterized in that, In the construction step 1), the muck is placed in a vibrating screen. The vibrating screen includes a horizontally rolling drum. A plurality of screen holes are provided on the outer periphery of the drum, and a horizontal cavity is provided inside the drum; A plurality of rolling rings are provided in the horizontal cavity. The plurality of rolling rings are arranged at intervals along the axial direction of the drum, and the rolling rings are arranged in a circumferential manner around the drum. The outer periphery of the rolling ring is rotatably connected to the drum, and an annular plate is provided inside the rolling ring. Adjacent rolling rings are connected by a plurality of elastic strips. The plurality of elastic strips are spaced and surrounded along the circumferential direction of the drum, and the elastic strips are arranged obliquely along the axial direction of the drum. In the construction step 1), after the muck is placed in the horizontal cavity, the drum rolls horizontally, and the plurality of rolling rings rotate synchronously relative to the drum. During the rotation of adjacent drums, the plurality of elastic strips elastically deform and reversely drive the rolling rings to rotate back to their original positions, so that the plurality of rolling rings reciprocally stir the muck in the horizontal cavity.