EP4015709B1 - Grouting structure filled with soluble crystal and construction method - Google Patents

Grouting structure filled with soluble crystal and construction method Download PDF

Info

Publication number
EP4015709B1
EP4015709B1 EP21847342.9A EP21847342A EP4015709B1 EP 4015709 B1 EP4015709 B1 EP 4015709B1 EP 21847342 A EP21847342 A EP 21847342A EP 4015709 B1 EP4015709 B1 EP 4015709B1
Authority
EP
European Patent Office
Prior art keywords
water
permeable
pipe
section
grouting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21847342.9A
Other languages
German (de)
French (fr)
Other versions
EP4015709A4 (en
EP4015709A1 (en
Inventor
Yunhe FAN
Changqing ZHENG
Yu YU
Wanqiang ZHAO
Yongping Zeng
Tao Pang
Yu Cao
Yongping Zhang
Yongjie TAN
Jinsong Liu
Yang Liu
Liang KUANG
Changguo HE
Yuzhe ZHOU
Guoquan JU
Li Jiang
Youhao LONG
Xiaochuan REN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Eryuan Engineering Group Co Ltd CREEC
Original Assignee
China Railway Eryuan Engineering Group Co Ltd CREEC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway Eryuan Engineering Group Co Ltd CREEC filed Critical China Railway Eryuan Engineering Group Co Ltd CREEC
Publication of EP4015709A1 publication Critical patent/EP4015709A1/en
Publication of EP4015709A4 publication Critical patent/EP4015709A4/en
Application granted granted Critical
Publication of EP4015709B1 publication Critical patent/EP4015709B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads
    • E02D5/80Ground anchors

Definitions

  • the present invention relates to the technical field of slope drainage engineering, and in particular, to a grouting structure filled with soluble crystals and a construction method thereof.
  • the existing drainage measures for slope mainly include surface drainage ditch, blind ditch, collecting well, horizontal drainage borehole, underground drainage hole, negative pressure drainage, etc.
  • the existing negative pressure drainage technology for slope mainly divides the slope boreholes into a water-permeable borehole section and a grouting seal borehole section, with a water-stop ring made of water-expanding rubber in between.
  • side slope underground water drilling self-starting negative pressure drainage system and method wherein a declination borehole grout into the grouting seal borehole section, and the reserved water-permeable borehole section is isolated from the outside atmosphere.
  • the water inlet of the drain pipe is arranged in the permeable pipe, and the water outlet of such pipe extends out of the ground through the water-stop ring made of water-expanding rubber for drainage.
  • the pressure in the borehole will gradually increase with the infiltration of groundwater, leading to the natural outflow of the groundwater from the water outlet.
  • the drainage capacity of the drain pipe is greater than the flow rate of groundwater in the slope infiltrating into the cavity of the water-permeable borehole section and the air pressure in the permeable pipe is lower than the atmospheric pressure (a negative pressure is formed)
  • the water in the soil around the permeable pipe continues to flow towards it, forcing the groundwater in the slope to flow rapidly towards the borehole to drain to the surface.
  • the negative pressure in the permeable pipe due to the negative pressure in the permeable pipe, the water in all directions around the permeable pipe will flow towards it, so the drainage range will increase, and such increased drainage range is more conducive to discharging the groundwater in the slope.
  • the difficulty of negative pressure drainage technology is that the water-permeable borehole section needs to maintain its permeability, and the slurry of the grouting seal borehole section cannot enter the water-permeable borehole section. If the pressure of grouting is high, the slurry will often break through the baffle structure such as the water-stop ring made of water-expanding rubber and enter the water-permeable borehole section, resulting in the failure of the borehole; if the pressure of grouting is small, the borehole section cannot be closed and the negative pressure cannot be formed. Accordingly, in order to solve the above problems, a new grouting technology is required.
  • WO2019/000776 discloses a grouting structure, comprising: a water-permeable section (water-permeable drilling section 6) and a grouting section (grouting closed drilling section 7), wherein the water-permeable section (6) is located at the lower part of a declination borehole (1 and the grouting section (7) is situated at the upper part of the borehole (1 ); a water-stop component (water-expanding rubber water stop ring 3) is arranged between the water-permeable section (7) and the grouting section (7) ; a permeable pipe (water pipe 4) is arranged in the water- permeable section (6) ; the top of the permeable pipe (4) is in contact with the water-stop component (3); a cavity is formed in the permeable pipe (4); the groundwater penetrates into the cavity through the permeable pipe (4); the water inlet of the drain pipe (4) is arranged in the water-permeable section (6), and the water inlet of the a drain pipe (d
  • an object of the present invention is to provide a grouting structure filled with soluble crystals and a construction method thereof.
  • a grouting structure filled with soluble crystals comprising a water-permeable section and a grouting section, wherein the water-permeable section is located at the lower part of a declination borehole, and the grouting section is situated at the upper part of the borehole; a water-stop component is arranged between the water-permeable section and the grouting section; a permeable pipe is arranged in the water-permeable section; the top of the permeable pipe is in contact with the water-stop component; a cavity is formed in the permeable pipe; the groundwater penetrates into the cavity through the permeable pipe; a water inlet of the drain pipe is arranged in the water-permeable section, and the water inlet of the drain pipe is insterted into the permeable pipe after passing through the water-stop component; a water outlet of the drain pipe is located at the lower part of the slope; an elevation of the water inlet of the drain pipe is higher than that
  • the permeable pipe is a pipe with permeable holes on its pipe wall.
  • the lift of the drain pipe being smaller than the height of the water column corresponding to atmospheric pressure means the height difference between the water inlet of the drain pipe and the borehole orifice is smaller than the height of the water column corresponding to the local atmospheric pressure in order to perform negative pressure drainage.
  • the present invention provides a grouting structure filled with soluble crystals, wherein the permeable pipe is filled with the solid soluble crystals to support the water-stop component to a certain extent during grouting, contributing to the prevention of the slurry from entering the water-permeable section, and the water-stop component from being squeezed to cause a large displacement; at the same time, grouting pressure will be increased to reduce the porosity of the grouting section and a better sealing can be achieved to ensure the negative pressure effect of the water-permeable section.
  • the soluble crystals can dissolve, thereby changing the osmotic pressure of the surrounding soil, leading to the water flow from the surrounding soil to the permeable section and finally forcing the groundwater in the slope to be discharged to the surface; the cavity in the permeable pipe can facilitate the infiltration of groundwater after the soluble crystals dissolve.
  • the present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing. It is conducive to ensuring continuous drainage of the deep portion of the slope, and is of great significance in solving the problem of drainage treatment of large-scale landslide.
  • the soluble crystals comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • the slurry of the grouting section is cement mortar or cement-sodium silicate slurry.
  • the water-stop component includes a water-stop strip made of water-expanding rubber, a water-stop belt or sandbags.
  • the bottom of the permeable pipe is provided with a pipe boot.
  • a construction method for a grouting structure filled with soluble crystals using any of the above-mentioned grouting structures filled with soluble crystals, comprising the following steps:
  • Adopting a construction method of a grouting structure filled with soluble crystals recites in the present invention, wherein the permeable pipe is filled with solid soluble crystals to support the water-stop component, does not increase additional difficulty and cost, effectively improving the pressure of grouting in the grouting process, contributing to the improvement of grouting efficiency and avoidance of the damage to the water-stop component, and effectively ensuring the grouting effect, thereby guaranteeing the effective formation of a negative pressure environment for efficient operation of the drainage system and continuous drainage.
  • step d the following steps are also included:
  • step g. stop suction when the concentration ⁇ of the soluble crystals is less than or equal to 1/2 ⁇ 0 , wherein ⁇ 0 stands for the initial concentration of the soluble crystals.
  • step e inject water above 40° C.
  • Element Reference 1-permeable pipe, 21-water-permeable section, 22-grouting section, 23-water-stop component, 24-slurry, 3-soluble crystals, 4-drain pipe, 5-groundwater level line.
  • a grouting structure filled with soluble crystals of the present invention comprising a water-permeable section 21 and a grouting section 22, wherein the water-permeable section 21 is located at the lower part of a declination borehole, and the grouting section 22 is situated at the upper part of the borehole; a water-stop component 23 is arranged between the water-permeable section 21 and the grouting section 22; a permeable pipe 1 is arranged in the water-permeable section 21; the top of the permeable pipe 1 contacts the water-stop component 23; a cavity is formed in the permeable pipe 1; the permeable pipe 1 is filled with solid soluble crystals 3; the groundwater penetrates into the cavity through the permeable pipe 1; the water inlet of the drain pipe 4 is arranged in the water-permeable section 21, and the water inlet of the drain pipe 4 inserts into the permeable pipe 1 after passing through the water-stop component 23; the water outlet of the drain pipe 4 is located at the lower
  • the diameter of the borehole should be larger than 90mm
  • the permeable pipe 1 can be a corrugated pipe, externally covered with filter cloth and internally supported by HDPE, preventing large particles such as coarse sand and gravel from entering;
  • a pipe boot is set at the bottom of the permeable pipe 1;
  • the pipe boot can be a HDPE pipe with a sealed bottom and an open top, and is sleeved on the bottom of the permeable pipe 1 (not shown in the FIG) ;
  • the drain pipe 4 can be a PA pipe with a diameter of 4-8mm;
  • the drain pipe 4 has good air tightness;
  • the drainage capacity of the drain pipe 4 is greater than the flow rate of groundwater in slope infiltrating into the water-permeable section 21, facilitating natural drainage when the water head height of the cavity in the permeable pipe 1 is greater than the orifice elevation of the borehole as a result of elevated groundwater level, discharging groundwater of the slope in real time, and keeping the groundwater below the safe water
  • the soluble crystals 3 comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • the space between the permeable pipe 1 and the drain pipe 4 is filled with the soluble crystals 3, providing effective support for the water-stop component 23 during grouting. After that, groundwater will flow into or additional water will be added into the permeable pipe 1 over time, dissolving the soluble crystals 3 and then freeing the cavity in the permeable pipe 1 for drainage.
  • Different soluble crystals 3 have different dissolution rates and can be selected according to actual needs.
  • the present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing; besides, solid salt and solid alum, after dissolving, will form a certain residue in the water-permeable section 21 and the drain pipe 4, contributing to the inhibition of growth of plants in the drain pipe 4 and the water-permeable section 21, the effective avoidance of blockage, and the guarantee of availability and continuity of the entire drainage system.
  • the construction method of a grouting structure filled with soluble crystals according to the present invention adopts a grouting structure filled with soluble crystals as described in Embodiment 1, and includes the following steps:
  • step 1 the solubility of the soluble crystals 3 can be roughly obtained according to the amount of water injected and the amount of the soluble crystals 3.
  • the prediction of reaching the predetermined solubility according to time is acceptable, and complete dissolution is not a must.
  • the cavity in the permeable pipe 1 can be vacated more quickly with water injection, as such, the groundwater in the surrounding soil can penetrate into the permeable pipe 1.
  • step 1 the pumping is stopped when it is detected that the concentration ⁇ of the soluble crystals 3 is less than or equal to 1/2 ⁇ 0 , wherein ⁇ 0 is the initial concentration of the soluble crystals 3 and can be can be roughly obtained according to the volume of the water-permeable section, the amount of water injected and the mass of the soluble crystals 3, or by referring to the concentration of the liquid extracted for the first time after a certain period of time.
  • concentration requirements are mainly used to roughly grasp the dissolution of the soluble crystals 3.
  • Water injection is optional, that is, not to perform steps e and 1, but to utilize the penetration of groundwater into the permeable section 21 to dissolve the soluble crystals 3.
  • the osmotic pressure increases, the attraction to groundwater elevates, and then the infiltration of groundwater into the permeable pipe 1 is accelerated; at the same time, the solution will diffuse freely and the groundwater can still effectively dissolve the soluble crystals 3 when the groundwater needs to be drained.
  • the soluble crystal 3 When the soluble crystal 3 is solid ice it can be effectively melt since the soil has a temperature and there is no need to inject water; after the ice melts, the cavity in the permeable pipe 1 is vacated and there is no need to test the concentration.
  • the groundwater level line 5 in the slope is higher than the highest point of the drain pipe 4 (that is where the orifice of the borehole is located)
  • the water head height of the water inlet of the drain pipe 4 is higher than that of the orifice of the borehole, discharging groundwater in the water-permeable section 21 by the drain pipe 4 under a water head difference, and triggering a drainage process.
  • a siphon drainage process is started and negative pressure is generated in the water-permeable section 21.
  • the groundwater in the slope accelerates into the cavity, and after the groundwater in the cavity and the soil above the water-permeable section 21 in the slope is drained, an entire drainage process ends; wherein with cycles of rainfall infiltration, the drainage process circulates, effectively realizing continuous drainage of a deep portion of the slope, solving a problem of drainage treatment of large landslide, and ensuring the stability of the slope with low maintenance cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Description

    Technical Field
  • The present invention relates to the technical field of slope drainage engineering, and in particular, to a grouting structure filled with soluble crystals and a construction method thereof.
  • Background
  • Rainfall infiltration is one of the important factors to change the mechanical parameters of the slope and induce landslides. Timely and effective drainage of the slope is an effective way to solve this problem. The existing drainage measures for slope mainly include surface drainage ditch, blind ditch, collecting well, horizontal drainage borehole, underground drainage hole, negative pressure drainage, etc.
  • The existing negative pressure drainage technology for slope mainly divides the slope boreholes into a water-permeable borehole section and a grouting seal borehole section, with a water-stop ring made of water-expanding rubber in between. As described in the Chinese Patent, publication No. CN107246019A , side slope underground water drilling self-starting negative pressure drainage system and method, wherein a declination borehole grout into the grouting seal borehole section, and the reserved water-permeable borehole section is isolated from the outside atmosphere. The water inlet of the drain pipe is arranged in the permeable pipe, and the water outlet of such pipe extends out of the ground through the water-stop ring made of water-expanding rubber for drainage. Before the drainage process occurs, the pressure in the borehole will gradually increase with the infiltration of groundwater, leading to the natural outflow of the groundwater from the water outlet. When the drainage process takes place, because the drainage capacity of the drain pipe is greater than the flow rate of groundwater in the slope infiltrating into the cavity of the water-permeable borehole section and the air pressure in the permeable pipe is lower than the atmospheric pressure (a negative pressure is formed), the water in the soil around the permeable pipe continues to flow towards it, forcing the groundwater in the slope to flow rapidly towards the borehole to drain to the surface. At the same time, due to the negative pressure in the permeable pipe, the water in all directions around the permeable pipe will flow towards it, so the drainage range will increase, and such increased drainage range is more conducive to discharging the groundwater in the slope.
  • However, in the process of on-site construction, the difficulty of negative pressure drainage technology is that the water-permeable borehole section needs to maintain its permeability, and the slurry of the grouting seal borehole section cannot enter the water-permeable borehole section. If the pressure of grouting is high, the slurry will often break through the baffle structure such as the water-stop ring made of water-expanding rubber and enter the water-permeable borehole section, resulting in the failure of the borehole; if the pressure of grouting is small, the borehole section cannot be closed and the negative pressure cannot be formed. Accordingly, in order to solve the above problems, a new grouting technology is required. WO2019/000776 discloses a grouting structure, comprising: a water-permeable section (water-permeable drilling section 6) and a grouting section (grouting closed drilling section 7), wherein the water-permeable section (6) is located at the lower part of a declination borehole (1 and the grouting section (7) is situated at the upper part of the borehole (1 ); a water-stop component (water-expanding rubber water stop ring 3) is arranged between the water-permeable section (7) and the grouting section (7) ; a permeable pipe (water pipe 4) is arranged in the water- permeable section (6) ; the top of the permeable pipe (4) is in contact with the water-stop component (3); a cavity is formed in the permeable pipe (4); the groundwater penetrates into the cavity through the permeable pipe (4); the water inlet of the drain pipe (4) is arranged in the water-permeable section (6), and the water inlet of the a drain pipe (drain pipe 8) is inserted into the permeable pipe (4) after passing through the water-stop component (3); the water outlet of the drain pipe (8) is located at the lower part of the slope (1 0); the elevation of the water inlet of the drain pipe (8) is higher than that of the water outlet of the drain pipe (8), and the lift of the drain pipe (8) is less than the height of the water column (11) corresponding to the atmospheric pressure; the space between the drain pipe (8) and the wall of the borehole of the grouting section (7) is used for grouting. However it does not disclose that the pipe is filled with solid soluble crystals.
  • Summary
  • For overcoming the deficiency of existing negative pressure drainage technology in controlling the pressure of grouting and the consequent failure in negative pressure drainage, an object of the present invention is to provide a grouting structure filled with soluble crystals and a construction method thereof.
  • Accordingly, in order to accomplish the above objects, the present invention provides the following technologies:
    A grouting structure filled with soluble crystals, comprising a water-permeable section and a grouting section, wherein the water-permeable section is located at the lower part of a declination borehole, and the grouting section is situated at the upper part of the borehole; a water-stop component is arranged between the water-permeable section and the grouting section; a permeable pipe is arranged in the water-permeable section; the top of the permeable pipe is in contact with the water-stop component; a cavity is formed in the permeable pipe; the groundwater penetrates into the cavity through the permeable pipe; a water inlet of the drain pipe is arranged in the water-permeable section, and the water inlet of the drain pipe is insterted into the permeable pipe after passing through the water-stop component; a water outlet of the drain pipe is located at the lower part of the slope; an elevation of the water inlet of the drain pipe is higher than that of the water outlet of the drain pipe, and the lift of the drain pipe is less than the height of the water column corresponding to the atmospheric pressure; a space between the drain pipe and the wall of the borehole of the grouting section is grounted; wherein the permeable pipe is filled with solid soluble crystals.
  • The permeable pipe is a pipe with permeable holes on its pipe wall.
  • The lift of the drain pipe being smaller than the height of the water column corresponding to atmospheric pressure means the height difference between the water inlet of the drain pipe and the borehole orifice is smaller than the height of the water column corresponding to the local atmospheric pressure in order to perform negative pressure drainage.
  • The present invention provides a grouting structure filled with soluble crystals, wherein the permeable pipe is filled with the solid soluble crystals to support the water-stop component to a certain extent during grouting, contributing to the prevention of the slurry from entering the water-permeable section, and the water-stop component from being squeezed to cause a large displacement; at the same time, grouting pressure will be increased to reduce the porosity of the grouting section and a better sealing can be achieved to ensure the negative pressure effect of the water-permeable section. The soluble crystals can dissolve, thereby changing the osmotic pressure of the surrounding soil, leading to the water flow from the surrounding soil to the permeable section and finally forcing the groundwater in the slope to be discharged to the surface; the cavity in the permeable pipe can facilitate the infiltration of groundwater after the soluble crystals dissolve. The present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing. It is conducive to ensuring continuous drainage of the deep portion of the slope, and is of great significance in solving the problem of drainage treatment of large-scale landslide.
  • Preferably, the soluble crystals comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • Different soluble crystals have different dissolution rates, and can be selected and matched according to actual needs. Among them, solid salt and solid alum, after dissolving, will form a certain residue in the water-permeable section and the drain pipe, contributing to the inhibition of growth of plants in the drain pipe and the water-permeable section, the effective avoidance of blockage, and the guarantee of effectiveness and continuity of the entire drainage system.
  • Preferably, the slurry of the grouting section is cement mortar or cement-sodium silicate slurry.
  • Preferably, the water-stop component includes a water-stop strip made of water-expanding rubber, a water-stop belt or sandbags.
  • Preferably, the bottom of the permeable pipe is provided with a pipe boot.
  • It is conducive to avoiding blockage at the bottom of the permeable pipe due to accumulation of sand and gravel and the consequent impact on drainage.
  • A construction method for a grouting structure filled with soluble crystals, using any of the above-mentioned grouting structures filled with soluble crystals, comprising the following steps:
    1. a. drilling a declination borehole according to the geological survey, and making the water-permeable section of the borehole below the groundwater level line of the slope;
    2. b. arranging a permeable pipe in the water-permeable section, and then inserting a drain pipe into the permeable pipe;
    3. c. filling the permeable pipe with solid soluble crystals, and then installing a water-stop component to block the water-permeable section;
    4. d. injecting slurry into the borehole to form a grouting section, and the completing the construction of the grouting structure.
  • Adopting a construction method of a grouting structure filled with soluble crystals recites in the present invention, wherein the permeable pipe is filled with solid soluble crystals to support the water-stop component, does not increase additional difficulty and cost, effectively improving the pressure of grouting in the grouting process, contributing to the improvement of grouting efficiency and avoidance of the damage to the water-stop component, and effectively ensuring the grouting effect, thereby guaranteeing the effective formation of a negative pressure environment for efficient operation of the drainage system and continuous drainage.
  • Preferably, after step d, the following steps are also included:
    • e. injecting water into the permeable pipe from the water outlet of the drain pipe;
    • f. drawing the solution out from the water outlet of the drain pipe and testing it after the soluble crystals are dissolved;
    • g. stopping suction and completing the construction of the grouting structure when the concentration ρ of the soluble crystals in the solution meets the requirements.
  • It is beneficial to dissolve the soluble crystals at a rapid pace so as to perform drainage as soon as possible.
  • Preferably, in the step g., stop suction when the concentration ρ of the soluble crystals is less than or equal to 1/2 ρ0, wherein ρ0 stands for the initial concentration of the soluble crystals.
  • Preferably, in the step e, inject water above 40° C.
  • To sum up, compared with the existing art, the beneficial effects of the present invention are:
    1. 1. The present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing. It is conducive to ensuring continuous drainage of the deep portion of the slope, and is of great significance in solving the problem of drainage treatment of large-scale landslide.
    2. 2. Adopting a construction method of a grouting structure filled with soluble crystals recites in the present invention, wherein the permeable pipe is filled with solid soluble crystals to support the water-stop component, does not increase additional difficulty and cost, effectively improving the pressure of grouting in the grouting process, contributing to the improvement of grouting efficiency and avoidance of the damage to the water-stop component, and effectively ensuring the grouting effect, thereby guaranteeing the effective formation of a negative pressure environment for efficient operation of the drainage system and continuous drainage.
    Brief Description of Drawings
    • FIG. 1 is a structure view of a grouting structure filled with soluble crystals of the present invention;
    • FIG. 2 is a view of drainage of a grouting structure filled with soluble crystals of the present invention.
  • Element Reference: 1-permeable pipe, 21-water-permeable section, 22-grouting section, 23-water-stop component, 24-slurry, 3-soluble crystals, 4-drain pipe, 5-groundwater level line.
  • Description of Embodiments
  • The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. However, it shall not be construed that the scope of the above-mentioned subject matter of the present invention is limited to the following embodiments, as all technologies realized based on the content of the present invention belong to the scope of the present invention.
  • Embodiment 1
  • Referring to FIG. 1, a grouting structure filled with soluble crystals of the present invention, comprising a water-permeable section 21 and a grouting section 22, wherein the water-permeable section 21 is located at the lower part of a declination borehole, and the grouting section 22 is situated at the upper part of the borehole; a water-stop component 23 is arranged between the water-permeable section 21 and the grouting section 22; a permeable pipe 1 is arranged in the water-permeable section 21; the top of the permeable pipe 1 contacts the water-stop component 23; a cavity is formed in the permeable pipe 1; the permeable pipe 1 is filled with solid soluble crystals 3; the groundwater penetrates into the cavity through the permeable pipe 1; the water inlet of the drain pipe 4 is arranged in the water-permeable section 21, and the water inlet of the drain pipe 4 inserts into the permeable pipe 1 after passing through the water-stop component 23; the water outlet of the drain pipe 4 is located at the lower part of the slope; the elevation of the water inlet of the drain pipe 4 is higher than that of the water outlet of the drain pipe 4, the lift of the drain pipe 4 is less than the height of the water column corresponding to the atmospheric pressure; the space between the drain pipe 4 and the wall of the borehole of the grouting section 22 is used for grouting.
  • Specifically, the diameter of the borehole should be larger than 90mm, and the permeable pipe 1 can be a corrugated pipe, externally covered with filter cloth and internally supported by HDPE, preventing large particles such as coarse sand and gravel from entering; a pipe boot is set at the bottom of the permeable pipe 1; the pipe boot can be a HDPE pipe with a sealed bottom and an open top, and is sleeved on the bottom of the permeable pipe 1 (not shown in the FIG) ; the drain pipe 4 can be a PA pipe with a diameter of 4-8mm; the drain pipe 4 has good air tightness; the drainage capacity of the drain pipe 4 is greater than the flow rate of groundwater in slope infiltrating into the water-permeable section 21, facilitating natural drainage when the water head height of the cavity in the permeable pipe 1 is greater than the orifice elevation of the borehole as a result of elevated groundwater level, discharging groundwater of the slope in real time, and keeping the groundwater below the safe water level; the slurry 24 of the grouting section 22 is cement mortar or cement-sodium silicate slurry, cutting off the water-gas connection between the ground surface and the cavity of the water-permeable borehole section; the water-stop component 23 includes a water-stop ring made of water-expanding rubber, a water-stop belt or sandbags; after the water-stop component 23 is closed, the gap between the drain pipe 4 and the wall of the borehole of the grouting section 22 is closed by grouting.
  • The soluble crystals 3 comprise at least one of solid salt, solid sugar, solid alum and solid ice. The space between the permeable pipe 1 and the drain pipe 4 is filled with the soluble crystals 3, providing effective support for the water-stop component 23 during grouting. After that, groundwater will flow into or additional water will be added into the permeable pipe 1 over time, dissolving the soluble crystals 3 and then freeing the cavity in the permeable pipe 1 for drainage. Different soluble crystals 3 have different dissolution rates and can be selected according to actual needs. The present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing; besides, solid salt and solid alum, after dissolving, will form a certain residue in the water-permeable section 21 and the drain pipe 4, contributing to the inhibition of growth of plants in the drain pipe 4 and the water-permeable section 21, the effective avoidance of blockage, and the guarantee of availability and continuity of the entire drainage system. solid salt and solid alum, after dissolving, will form a certain residue in the water-permeable section 21 and the drain pipe 4, contributing to the inhibition of growth of plants in the drain pipe 4 and the water-permeable section 21, the effective avoidance of blockage, and the guarantee of effectiveness and continuity of the entire drainage system.
  • Embodiment 2
  • The construction method of a grouting structure filled with soluble crystals according to the present invention adopts a grouting structure filled with soluble crystals as described in Embodiment 1, and includes the following steps:
    1. a. drilling a declination borehole according to the geological survey, and making the water-permeable section 21 of the borehole below the groundwater level line 5 of the slope, that is, the position of the water-permeable section 21 is set according to the water level of the groundwater level line 5; the height difference between the bottom of the borehole and the orifice of the borehole is less than the height of the water column corresponding to the local atmospheric pressure, ensuring that the lift of the drain pipe 4 meets the requirements;
    2. b. arranging a permeable pipe 1 in the water-permeable section 21, and then inserting a drain pipe 4 into the permeable pipe 1 with the port of the drain pipe 4 extending into the bottom of the permeable pipe 1;
    3. c. filling the permeable pipe 1 with solid soluble crystals 3 until it is full, and then installing a water-stop component 23 to block the water-permeable section 21;
    4. d. injecting slurry 24 into the borehole to form the grouting section 22 by the backward method can increase the pressure of grouting during grouting; the slurry 24 flowing into the surrounding soil to further ensure the sealing of the grouting section 22.
    5. e. injecting water, such as water above 40° C, into the permeable pipe 1 from the water outlet of the drain pipe 4;
    6. f. drawing the solution out from the water outlet of the drain pipe 4 and testing it after the soluble crystals 3 are dissolved; stopping suction and completing the construction of the grouting structure when the concentration ρ of the soluble crystals 3 in the solution meets the requirements.
  • In step 1, the solubility of the soluble crystals 3 can be roughly obtained according to the amount of water injected and the amount of the soluble crystals 3. The prediction of reaching the predetermined solubility according to time is acceptable, and complete dissolution is not a must. The cavity in the permeable pipe 1 can be vacated more quickly with water injection, as such, the groundwater in the surrounding soil can penetrate into the permeable pipe 1.
  • In step 1, the pumping is stopped when it is detected that the concentration ρ of the soluble crystals 3 is less than or equal to 1/2 ρ0, wherein ρ0 is the initial concentration of the soluble crystals 3 and can be can be roughly obtained according to the volume of the water-permeable section, the amount of water injected and the mass of the soluble crystals 3, or by referring to the concentration of the liquid extracted for the first time after a certain period of time. The aforementioned concentration requirements are mainly used to roughly grasp the dissolution of the soluble crystals 3.
  • Water injection is optional, that is, not to perform steps e and 1, but to utilize the penetration of groundwater into the permeable section 21 to dissolve the soluble crystals 3. During the dissolution process, the osmotic pressure increases, the attraction to groundwater elevates, and then the infiltration of groundwater into the permeable pipe 1 is accelerated; at the same time, the solution will diffuse freely and the groundwater can still effectively dissolve the soluble crystals 3 when the groundwater needs to be drained.
  • When the soluble crystal 3 is solid ice it can be effectively melt since the soil has a temperature and there is no need to inject water; after the ice melts, the cavity in the permeable pipe 1 is vacated and there is no need to test the concentration.
  • As shown in FIG. 2, after the construction is completed, since the groundwater level line 5 in the slope is higher than the highest point of the drain pipe 4 (that is where the orifice of the borehole is located), the water head height of the water inlet of the drain pipe 4 is higher than that of the orifice of the borehole, discharging groundwater in the water-permeable section 21 by the drain pipe 4 under a water head difference, and triggering a drainage process. When the groundwater level drops below the highest point of the drain pipe 4, a siphon drainage process is started and negative pressure is generated in the water-permeable section 21. As such, the groundwater in the slope accelerates into the cavity, and after the groundwater in the cavity and the soil above the water-permeable section 21 in the slope is drained, an entire drainage process ends; wherein with cycles of rainfall infiltration, the drainage process circulates, effectively realizing continuous drainage of a deep portion of the slope, solving a problem of drainage treatment of large landslide, and ensuring the stability of the slope with low maintenance cost.

Claims (9)

  1. A grouting structure filled with soluble crystals, comprising: a drain pipe (4), a water-permeable section (21) and a grouting section (22), wherein the water-permeable section (21) is located at the lower part of a declination borehole, and the grouting section (22) is situated at the upper part of the borehole; a water-stop component (23) is arranged between the water-permeable section (21) and the grouting section (22); a permeable pipe (1) is arranged in the water-permeable section (21); the top of the permeable pipe (1) is in contact with the water-stop component (23); a cavity is formed in the permeable pipe (1) ; the groundwater penetrates into the cavity through the permeable pipe (1); a water inlet of the drain pipe (4) is arranged in the water-permeable section (21), and the water inlet of the drain pipe (4) is inserted into the permeable pipe (1) after passing through the water-stop component (23); a water outlet of the drain pipe (4) is located at the lower part of the slope; an elevation of the water inlet of the drain pipe (4) is higher than that of the water outlet of the drain pipe (4), and the lift of the drain pipe (4) is less than the height of the water column corresponding to the atmospheric pressure; a space between the drain pipe (4) and the wall of the borehole of the grouting section (22) is grounted;
    wherein the permeable pipe (1) is filled with solid soluble crystals (3);
  2. The grouting structure, as recited in claim 1, wherein the soluble crystals (3) comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  3. The grouting structure, as recited in claim 1, wherein a slurry (24) of the grouting section (22) is cement mortar or cement-sodium silicate slurry.
  4. The grouting structure, as recited in any one of claims 1-3, wherein the water-stop component (23) includes a water-stop strip made of water-expanding rubber, a water-stop belt or sandbags.
  5. The grouting structure, as recited in any one of claims 1-3, wherein the bottom of the permeable pipe (1) is provided with a pipe boot.
  6. A construction method for a grouting structure filled with soluble crystals, wherein any grouting structure filled with soluble crystals is applied in accordance with claims 1-5, comprises the following steps:
    a. drilling a declination borehole according to the geological survey, and making the water-permeable section (21) of the borehole below the groundwater level line (5) of the slope;
    b. arranging a permeable pipe (1) in the water-permeable section (21), and then inserting a drain pipe (4) into the permeable pipe (1);
    c. filling the permeable pipe (1) with solid soluble crystals (3), and then installing a water-stop component (23) to block the water-permeable section (21) ;
    d. injecting slurry (24) into the borehole to form a grouting section (22), and then completing the construction of the grouting structure.
  7. The construction method, as recited in claim 6, wherein the following steps are included after step d:
    e. injecting water into the permeable pipe (1) from the water outlet of the drain pipe (4);
    f. drawing the solution out from the water outlet of the drain pipe (4) and testing it after the soluble crystals (3) are dissolved;
    g. stopping suction and completing the construction of the grouting structure when the concentration ρ of the soluble crystals (3) in the solution meets the requirements.
  8. The construction method, as recited in claim 7, wherein suction is stopped when the concentration ρ of the soluble crystals (3) is less than or equal to 1/2 ρ0 in the step 1, wherein ρ0 stands for the initial concentration of the soluble crystals.
  9. The construction method, as recited in claim 7, wherein water above 40°C is injected in the step e.
EP21847342.9A 2020-07-20 2021-07-13 Grouting structure filled with soluble crystal and construction method Active EP4015709B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010700824.5A CN111794238B (en) 2020-07-20 2020-07-20 Grouting structure for filling soluble crystals and construction method
PCT/CN2021/106035 WO2022017226A1 (en) 2020-07-20 2021-07-13 Grouting structure filled with soluble crystal and construction method

Publications (3)

Publication Number Publication Date
EP4015709A1 EP4015709A1 (en) 2022-06-22
EP4015709A4 EP4015709A4 (en) 2022-12-28
EP4015709B1 true EP4015709B1 (en) 2023-05-31

Family

ID=72807792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21847342.9A Active EP4015709B1 (en) 2020-07-20 2021-07-13 Grouting structure filled with soluble crystal and construction method

Country Status (3)

Country Link
EP (1) EP4015709B1 (en)
CN (1) CN111794238B (en)
WO (1) WO2022017226A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111794238B (en) * 2020-07-20 2021-05-04 中铁二院工程集团有限责任公司 Grouting structure for filling soluble crystals and construction method
CN113323723B (en) * 2021-06-25 2021-11-16 中铁二院工程集团有限责任公司 Acid-soluble drilling drainage structure for tunnel and side slope of karst or fault and construction method
CN113445959B (en) * 2021-08-10 2022-02-01 中铁二院工程集团有限责任公司 Drilling drainage structure of karst or fault tunnel and construction method and construction structure thereof

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPC20060043A1 (en) * 2006-10-02 2008-04-03 Cesare Melegari METHOD FOR THE REALIZATION OF DRAINAGE WORKS, IN PARTICULAR FOR THE STABILIZATION, OF VERSATIVES AND / OR UNSTABLE OR LANDSCAPE
JP4716134B2 (en) * 2007-04-25 2011-07-06 東洋建設株式会社 Slope stabilization method
JP5313192B2 (en) * 2010-03-03 2013-10-09 公益財団法人鉄道総合技術研究所 Slope stabilization method with drainage using injected material
CN102251529A (en) * 2011-06-02 2011-11-23 浙江大学 Self-balancing siphon drainage method by using side slope declining drill hole
CN102635402A (en) * 2012-04-11 2012-08-15 浙江大学 Siphon drainage method for tunnel wall water seepage disposal by using dipping borehole
CN107246019B (en) * 2017-06-30 2019-10-29 浙江大学 A kind of slope underground water drilling self-starting drainage by suction method
CN107237650B (en) * 2017-06-30 2020-02-11 浙江大学 Drilling siphon negative pressure drainage system and method for treating water seepage of tunnel wall
CN109629566B (en) * 2019-01-16 2021-04-06 宁夏大学 Vacuum drainage anchor rod and construction method thereof
CN209780957U (en) * 2019-03-13 2019-12-13 云南建投基础工程有限责任公司 Water-rich railway tunnel bottom sluicing decompression and reinforced structure
CN111005760A (en) * 2019-12-27 2020-04-14 中铁二院工程集团有限责任公司 Drainage type drainage system for karst tunnel
CN111425249A (en) * 2020-03-30 2020-07-17 中铁二院工程集团有限责任公司 Tunnel wind power drainage system
CN111794238B (en) * 2020-07-20 2021-05-04 中铁二院工程集团有限责任公司 Grouting structure for filling soluble crystals and construction method
CN111810234B (en) * 2020-07-20 2021-06-29 中铁二院工程集团有限责任公司 Tunnel water seepage and harmful gas discharge structure and semi-closed ice filling drilling construction method

Also Published As

Publication number Publication date
EP4015709A4 (en) 2022-12-28
CN111794238A (en) 2020-10-20
CN111794238B (en) 2021-05-04
WO2022017226A1 (en) 2022-01-27
EP4015709A1 (en) 2022-06-22

Similar Documents

Publication Publication Date Title
EP4015709B1 (en) Grouting structure filled with soluble crystal and construction method
US10577770B2 (en) Self-starting negative pressure drainage system for draining groundwater in slope and construction method thereof
CN107237650B (en) Drilling siphon negative pressure drainage system and method for treating water seepage of tunnel wall
CN111810234B (en) Tunnel water seepage and harmful gas discharge structure and semi-closed ice filling drilling construction method
CN106320353B (en) A kind of construction method of basement construction Yield rainfall relation device
CN109707444B (en) Automatic start-up formula tunnel drainage system
CN109898533A (en) Raft plate built-in dewatering structure, well sealing structure of dewatering well and well sealing method
CN110896645B (en) Pile bottom grouting device, using method thereof, cast-in-place pile body and construction method of cast-in-place pile body
CN118241679B (en) Method for plugging large water burst in foundation pit rock fracture zone
CN109024706A (en) A kind of foundation pit waterproof curtain breakthrough inside method for blocking
CN109339079A (en) A kind of foundation pit water-stopping system and its construction technology close to river permeable stratum
CN112627212A (en) Water-faced cofferdam inner tube well dewatering dry excavation construction method
CN112096343A (en) Borehole closure device, and gravity drainage device and method for a dive borehole
CN209260739U (en) A kind of foundation pit water-stopping system close to river permeable stratum
CN116024998A (en) Construction method for water-sealing blocking of deep foundation pit dewatering well
CN111622249B (en) Miniature pumping device for underground water of narrow foundation pit and construction method thereof
CN209011145U (en) A kind of base pit dewatering structure
CN110761291B (en) Anti-floating waterproof system and method applied to karst water-rich region deep foundation pit
KR102051579B1 (en) Soft ground improvement device and that method
CN113445959B (en) Drilling drainage structure of karst or fault tunnel and construction method and construction structure thereof
CN113323723B (en) Acid-soluble drilling drainage structure for tunnel and side slope of karst or fault and construction method
JP3650809B2 (en) Water flow hole forming apparatus and method for forming water flow holes used for water flow hole formation for maintaining groundwater flow in impermeable walls
CN115142453B (en) Relief well structure in foundation pit and construction method thereof
CN108385704A (en) A kind of diaphram wall piping plugging structure and its construction method
CN220847613U (en) Precipitation structure of foundation pit for river-like construction

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20220318

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

A4 Supplementary search report drawn up and despatched

Effective date: 20221124

RIC1 Information provided on ipc code assigned before grant

Ipc: E02D 5/80 20060101ALI20221118BHEP

Ipc: E02D 15/04 20060101ALI20221118BHEP

Ipc: E02D 19/10 20060101ALI20221118BHEP

Ipc: E02D 3/10 20060101ALI20221118BHEP

Ipc: E02D 17/20 20060101AFI20221118BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: E02D 5/80 20060101ALI20230220BHEP

Ipc: E02D 15/04 20060101ALI20230220BHEP

Ipc: E02D 19/10 20060101ALI20230220BHEP

Ipc: E02D 3/10 20060101ALI20230220BHEP

Ipc: E02D 17/20 20060101AFI20230220BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
INTG Intention to grant announced

Effective date: 20230330

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1570982

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230615

Ref country code: DE

Ref legal event code: R096

Ref document number: 602021002571

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20230531

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1570982

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230831

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230930

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230901

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230816

Year of fee payment: 3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20231002

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602021002571

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20230731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230713

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230713

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20240201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

26N No opposition filed

Effective date: 20240301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230531

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230713

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230713