CN110005422B - Shield grouting wrapping method - Google Patents
Shield grouting wrapping method Download PDFInfo
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- CN110005422B CN110005422B CN201910287115.6A CN201910287115A CN110005422B CN 110005422 B CN110005422 B CN 110005422B CN 201910287115 A CN201910287115 A CN 201910287115A CN 110005422 B CN110005422 B CN 110005422B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 40
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000005641 tunneling Effects 0.000 claims abstract description 22
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 10
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 239000011550 stock solution Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000015271 coagulation Effects 0.000 claims description 4
- 238000005345 coagulation Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000008093 supporting effect Effects 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 4
- 239000011241 protective layer Substances 0.000 abstract description 2
- 230000005465 channeling Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/12—Water-soluble silicates, e.g. waterglass
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Soil Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a shield grouting wrapping method, which comprises the steps of preparing a water glass solution and a phosphoric acid solution by stirring according to a proportion, injecting the water glass solution and the phosphoric acid solution into the periphery of a shield body from a shield body reserved radial grouting hole by utilizing a double-fluid injection system of a shield machine, forming a protective layer at the periphery of the shield body, preventing slurry from channeling to the periphery of the shield body to cause body locking when the double-fluid grouting is backfilled and reinforced, and supporting and reinforcing a soil body at the periphery of the shield body; and a sealing failure device is arranged, so that effective sealing is formed between the shield tail and the duct piece, muddy water is prevented from flowing into the shield tunneling machine, and the smoothness of the tunneling process of the shield tunneling machine is ensured.
Description
Technical Field
The invention relates to a tunnel and underground engineering, in particular to a shield method tunnel construction method.
Background
In the process of shield tunneling in and out of a hole, penetrating a composite stratum and penetrating a building under the hole, in order to ensure the safety of construction and ground surface construction, a cement-water glass double-liquid slurry mode is often adopted to reinforce a soil body or a cavity so as to prevent the ground surface from deforming excessively. However, when double-fluid slurry is injected, slurry can flow around the shield body and lock the shield machine after being condensed, so that the shield machine is protected by being wrapped before the slurry is injected.
Currently, a currently available similar technical process is a mud-restraining process. The mud-effect-restraining material has the characteristics of never solidifying and certain bearing capacity, the mud-effect-restraining construction method can not clamp the main shield body due to the solidification of the material, and can also effectively fill gaps generated by tunneling to achieve the purpose of supporting the upper soil body to be stable in structure. The viscosity of the product is adjustable, the viscosity can be adjusted in time according to needs, and the product cannot rapidly flow to the front of the cutter head or the back of the tail shield from an injection point. The construction method is simple to use and operate, and can directly pump the mixture to the periphery of the shield body only by uniformly mixing the mixture with water in proportion.
However, considering the safety of the ground surface and the stability of the stratum in the underground engineering construction, the non-condensable material is easy to flow and lose compared with the condensed material, and the supporting and reinforcing effects are not obvious. Therefore, the selection of the consolidation material which can play a better role in supporting and reinforcing is optimal without causing locking after the shield machine is wrapped for protection.
In addition, the existing shield tail seal only depends on filling grease by a shield tail brush, and a ring formed after the duct piece is installed and an inherent ring of the shield tail seal brush are in an eccentric state, so that the condition of seal failure exists.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention mainly aims to solve the problem that the existing cement effect-inhibiting material is not solidified, and provides a shield grouting wrapping method which is replaced and improved by modified water glass.
In order to achieve the aim, the invention provides a shield grouting wrapping method, which comprises the following steps:
(1) proportioning:
the modified water glass slurry comprises the following components in percentage by weight: the volume ratio of the water glass stock solution (37Be) to water is 1:1, the volume ratio of the phosphoric acid stock solution to water is 1:16, and the volume ratio of the water glass solution to the phosphoric acid solution is 1: 1;
(2) stirring:
when the modified water glass slurry is prepared and stirred, water is added while stirring, so that the materials are uniformly stirred;
(3) cleaning:
flushing water pipes are arranged at the elevated tank, the slurry transporting vehicle and the slurry mixing machine, a dredger is arranged at the shield operation surface, and cleaning treatment is carried out on the grouting equipment during injection;
(4) grouting and wrapping:
injecting modified water glass around the shield body by using a piston pump through a radial preformed hole of the shield body, filling building gaps around the shield body with the modified water glass under the action of pressure, and adding a layer of protective film around the shield body by the cured modified water glass; wherein the grouting amount of each ring of the modified water glass is as follows:
Q＝Kπ(Φ1 2—Φ2 2)×1/4×L，
wherein phi 1 is the outer diameter of the shield, phi 2 is the outer diameter of the segment, L is the length of the ring, and K is a coefficient, and the value is 1.5-2.2;
(5) and (3) sealing monitoring:
injecting shield tail grease at the position of the shield tail steel wire brush to achieve the sealing function of the shield; simultaneously arranging a sealing failure monitoring device and a sealing failure emergency device, and starting the sealing failure emergency device when the sealing failure of the shield tail brush is detected;
(6) secondary cleaning:
and cleaning the pipeline piston in time after the injection is finished.
Further, in the step (1), a mixing ratio can be established according to actual conditions to adjust the coagulation time. The setting time of the modified water glass is related to the PH value, the setting time is shorter when the PH value is larger, the penetration or diffusion range of the modified water glass in the stratum is smaller, and the engineering application is not utilized; when the pH value is small, the setting time is long, the penetration or diffusion distance of the modified water glass in the stratum is too long, and the engineering application is not utilized.
Further, in the step (4), an operator needs to stare at and control the grouting pressure and record the grouting pressure, and the injection is stopped in time. The grouting pressure depends on the geological conditions and groundwater pressure, the grouting pressure and the amount of grouting being controlled to ensure that the entire building void is filled. And during grouting, the grouting quantity and the grouting pressure are considered according to the actual construction condition and the geological condition. And (4) the grouting speed and the tunneling are kept synchronous, namely grouting is carried out while the shield tunneling is carried out, and the grouting is correspondingly stopped after the tunneling is stopped.
Further, in the step (4), K is 2.2. The actual grouting amount is more than the theoretical building void volume due to the reasons that grout pressed into the back surface of the lining can be subjected to water loss shrinkage consolidation, part of grout can be split into surrounding strata, curve propulsion, deviation correction or shield tunneling machine head raising and the like. In addition, the shield is considered to be propelled in a sand layer and a small radius, and the loss and the overbreak amount need to be fully considered in the slurry amount of synchronous grouting.
Furthermore, flushing water pipes are arranged at the elevated tank, the slurry transporting vehicle and the slurry mixing machine, a dredger is arranged at the shield operation surface, and pipelines are cleaned in the step (3) and the step (6).
Further, in the step (2), the slurry mixing area is positioned between the travelling rails of the working well, and slurry is mixed and then enters the slurry storage box and then slides into the slurry transport vehicle at the bottom of the well through the chute.
Furthermore, in order to prevent underground water and synchronous grouting slurry from entering the tunnel from the shield tail during shield tunneling, shield tail grease is injected at the position of the shield tail steel wire brush so as to achieve the sealing function of the shield. In order to prevent that the condition of sealing failure from appearing, set up sealed emergency device in shield tail brush department, include: elastic coat, fixed column, magnetic flux, excitation coil, magnetorheological suspensions, the extrusion of elastic coat sets up between section of jurisdiction and shield tail, and the fixed column sets up on the shield tail, and it has inlayed excitation coil, and magnetorheological suspensions fills up between fixed column and elastic coat. When the electromagnetic coil has no current, the magnetorheological fluid is Newtonian fluid, the viscosity of the fluid is very small, and when the ring formed after the duct piece is installed and the inherent ring of the shield tail sealing brush are in an eccentric state, the elastic outer sleeve is arranged between the two rings in an extruding mode, and the fluid can be completely filled in the elastic outer sleeve along with the deformation of the elastic outer sleeve. However, when the sealing failure of the shield tail brush is detected, the electromagnetic coil is electrified, the suspended particles in the magnetorheological fluid are magnetized under the action of a magnetic field and mutually attract each other along the direction of the magnetic field to form a chain, the chain structure increases the shearing stress of the magnetorheological fluid, the viscosity is increased by means of the shearing stress, the magnetorheological fluid is not easy to deform and is firmly sealed between the two circular rings, so that the shield tail and the duct piece form effective sealing, muddy water is prevented from flowing into the shield machine, and the smoothness of the tunneling process of the shield machine is ensured. After the coil is powered off, the magneto-rheological fluid is quickly converted into Newtonian fluid, so that the viscosity of the Newtonian fluid is very small.
The invention is mixed into water glass solution and phosphoric acid solution according to the proportion, and the mixture is injected into the periphery of the shield body from the reserved radial grouting hole of the shield body by utilizing a double-fluid injection system of the shield machine. The water glass solution and the phosphoric acid solution can form crystals in a short time after being mixed, are not easy to flow, can be filled in a large range, and saves materials; the mixed solution is solidified, the supporting and reinforcing effects are better, the cohesive force in the crystals is low, the strength is low, the contact surface can be easily damaged when the shield tunneling is recovered, and large cohesive resistance cannot be generated.
Compared with the prior art, the invention has the following beneficial effects: the materials are widely available; a layer of isolation protection barrier can be formed around the shield body to prevent slurry from flowing to the shield body; the modified water glass has the characteristic of cementing, and particularly, the modified water glass can be quickly filled at fixed points, so that a better stratum supporting and reinforcing effect can be achieved; the shield tail is provided with the sealing emergency device, so that effective sealing is formed between the shield tail and the duct piece, muddy water is prevented from flowing into the shield machine, and the smoothness of the tunneling process of the shield machine is ensured.
Drawings
FIG. 1 is a schematic flow diagram of a shield grouting wrapping method according to the present invention;
fig. 2 is a schematic view of a sealed emergency device according to the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, the term "comprise" or variations such as "comprises" or "comprising," etc., will be understood to imply the inclusion of stated elements or components but not the exclusion of any other elements or components unless specifically stated otherwise.
The invention provides a shield grouting wrapping method, which comprises the following steps:
(1) proportioning:
the modified water glass slurry comprises the following components in percentage by weight: the volume ratio of the water glass stock solution (37Be) to water is 1:1, the volume ratio of the phosphoric acid stock solution to water is 1:16, and the volume ratio of the water glass solution to the phosphoric acid solution is 1: 1;
(2) stirring:
when the modified water glass slurry is prepared and stirred, water is added while stirring, so that the materials are uniformly stirred;
(3) cleaning:
flushing water pipes are arranged at the elevated tank, the slurry transporting vehicle and the slurry mixing machine, a dredger is arranged at the shield operation surface, and cleaning treatment is carried out on the grouting equipment during injection;
(4) grouting and wrapping:
injecting modified water glass around the shield body by using a piston pump through a radial preformed hole of the shield body, filling building gaps around the shield body with the modified water glass under the action of pressure, and adding a layer of protective film around the shield body by the cured modified water glass; wherein the grouting amount of each ring of the modified water glass is as follows:
Q＝Kπ(Φ1 2—Φ2 2)×1/4×L，
wherein phi 1 is the outer diameter of the shield, phi 2 is the outer diameter of the segment, L is the length of the ring, and K is a coefficient, and the value is 1.5-2.2;
(5) and (3) sealing monitoring:
injecting shield tail grease at the position of the shield tail steel wire brush to achieve the sealing function of the shield; simultaneously arranging a sealing failure monitoring device and a sealing failure emergency device, and starting the sealing failure emergency device when the sealing failure of the shield tail brush is detected;
(6) secondary cleaning:
and cleaning the pipeline piston in time after the injection is finished.
Further, in the step (1), a mixing ratio can be established according to actual conditions to adjust the coagulation time. The setting time of the modified water glass is related to the PH value, the setting time is shorter when the PH value is larger, the penetration or diffusion range of the modified water glass in the stratum is smaller, and the engineering application is not utilized; when the pH value is small, the setting time is long, the penetration or diffusion distance of the modified water glass in the stratum is too long, and the engineering application is not utilized.
Further, in the step (4), an operator needs to stare at and control the grouting pressure and record the grouting pressure, and the injection is stopped in time. The grouting pressure depends on the geological conditions and groundwater pressure, the grouting pressure and the amount of grouting being controlled to ensure that the entire building void is filled. And during grouting, the grouting quantity and the grouting pressure are considered according to the actual construction condition and the geological condition. And (4) the grouting speed and the tunneling are kept synchronous, namely grouting is carried out while the shield tunneling is carried out, and the grouting is correspondingly stopped after the tunneling is stopped.
Further, in the step (4), K is 2.2. The actual grouting amount is more than the theoretical building void volume due to the reasons that grout pressed into the back surface of the lining can be subjected to water loss shrinkage consolidation, part of grout can be split into surrounding strata, curve propulsion, deviation correction or shield tunneling machine head raising and the like. In addition, the shield is considered to be propelled in a sand layer and a small radius, and the loss and the overbreak amount need to be fully considered in the slurry amount of synchronous grouting.
Furthermore, flushing water pipes are arranged at the elevated tank, the slurry transporting vehicle and the slurry mixing machine, a dredger is arranged at the shield operation surface, and pipelines are cleaned in the step (3) and the step (6).
Further, in the step (2), the slurry mixing area is positioned between the travelling rails of the working well, and slurry is mixed and then enters the slurry storage box and then slides into the slurry transport vehicle at the bottom of the well through the chute.
Furthermore, in order to prevent underground water and synchronous grouting slurry from entering the tunnel from the shield tail during shield tunneling, shield tail grease is injected at the position of the shield tail steel wire brush so as to achieve the sealing function of the shield. In order to prevent the sealing failure, a sealing emergency device 3 is arranged at the shield tail brush 2 and comprises: elastic jacket 4, fixed column 6, magnetic flux, excitation coil 7, magnetorheological suspensions 5, elastic jacket 4 extrusion sets up between section of jurisdiction 8 and shield tail 1, and fixed column 6 sets up on shield tail 1, and it has inlayed excitation coil 7, and magnetorheological suspensions 5 fills between fixed column 6 and elastic jacket 4. When the electromagnetic coil has no current, the magnetorheological fluid is Newtonian fluid, the viscosity of the fluid is very small, and when the ring formed after the duct piece is installed and the inherent ring of the shield tail sealing brush are in an eccentric state, the elastic outer sleeve is arranged between the two rings in an extruding mode, so that the elastic outer sleeve can be always in contact with the two rings in the eccentric state, and the fluid can be filled in the elastic outer sleeve along with the deformation of the elastic outer sleeve. However, when the sealing failure of the shield tail brush is detected, the electromagnetic coil is electrified, the suspended particles in the magnetorheological fluid are magnetized under the action of a magnetic field and mutually attract each other along the direction of the magnetic field to form a chain shape, the chain structure increases the shearing stress of the magnetorheological fluid, the viscosity is increased by means of the shearing stress, the magnetorheological fluid is not easy to deform and is firmly sealed between the two circular rings, and effective sealing is formed between the shield tail and the duct piece. After the coil is powered off, the magnetorheological fluid is quickly converted into Newtonian fluid, so that the viscosity of the Newtonian fluid is very low, the elastic sleeve recovers the elastic function, and the magnetorheological fluid is ensured to be always in contact with the two rings.
In the invention, a 'protective layer' is formed at the periphery of the shield body by injecting the modified water glass around the shield body, so that the effect of preventing slurry from jumping to the periphery of the shield body to cause the locking of a machine body when double-slurry is injected for backfill and reinforcement is achieved, and the soil body around the shield body can be supported and reinforced by utilizing the self-consolidation characteristic.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A shield grouting wrapping method is characterized by comprising the following steps:
(1) proportioning:
the modified water glass slurry comprises the following components in percentage by weight: the volume ratio of the water glass stock solution (37Be) to water is 1:1, the volume ratio of the phosphoric acid stock solution to water is 1:16, and the volume ratio of the water glass solution to the phosphoric acid solution is 1: 1;
(2) stirring:
adding water while stirring when preparing and stirring the modified water glass slurry to ensure that all materials are uniformly stirred, wherein a slurry stirring area is positioned between travelling rails of a working well, and the slurry is firstly put into a slurry storage box after being stirred and then is slid into a slurry transport vehicle at the bottom of the well through a chute;
(3) cleaning:
flushing water pipes are arranged at the elevated tank, the slurry transporting vehicle and the slurry mixing machine, a dredger is arranged at the shield operation surface, and cleaning treatment is carried out on the grouting equipment during injection;
(4) grouting and wrapping:
injecting modified water glass around the shield body by using a piston pump through a radial preformed hole of the shield body, filling a building gap around the shield body with the modified water glass under the action of pressure, and adding a layer of protective film on the periphery of the shield body by the cured modified water glass;
wherein the grouting amount of each ring of the modified water glass is as follows:
Q＝Kπ(Φ1 2—Φ2 2)×1/4×L，
wherein phi 1 is the outer diameter of the shield, phi 2 is the outer diameter of the segment, L is the length of the ring, and K is a coefficient, and the value is 1.5-2.2;
an operator needs to stare at and control the grouting pressure and record the grouting pressure, and the grouting is stopped in time; during grouting, the grouting quantity and the grouting pressure are considered according to the actual construction condition and the geological condition; the grouting speed and the tunneling are kept synchronous, grouting is carried out while the shield tunneling is carried out, and after the tunneling is stopped, the grouting is correspondingly stopped;
(5) and (3) sealing monitoring:
injecting shield tail grease at the position of the shield tail steel wire brush to achieve the sealing function of the shield; simultaneously arranging a sealing failure monitoring device and a sealing failure emergency device, and starting the sealing failure emergency device when the sealing failure of the shield tail brush is detected;
sealed emergency device, comprising: the device comprises an elastic outer sleeve, a fixing column, magnetic flux, an excitation coil and magnetorheological fluid, wherein the elastic outer sleeve is arranged between a duct piece and a shield tail in an extruding mode, the fixing column is arranged on the shield tail and embedded with the excitation coil, and the magnetorheological fluid is filled between the fixing column and the elastic outer sleeve; when the electromagnetic coil has no current, the magnetorheological fluid is Newtonian fluid, the viscosity of the fluid is very small, and when the ring formed after the duct piece is installed and the inherent ring of the shield tail sealing brush are in an eccentric state, the elastic outer sleeve is arranged between the two rings in an extruding way, and the fluid can be completely filled in the elastic outer sleeve along with the deformation of the elastic outer sleeve; when the sealing failure of the shield tail brush is detected, current is introduced into the electromagnetic coil, suspended particles in the magnetorheological fluid are magnetized under the action of a magnetic field and mutually attract along the direction of the magnetic field to form a chain, the shearing stress of the magnetorheological fluid is increased by the chain structure, the viscosity is increased by the shearing stress and is not easy to deform, the chain structure is firmly sealed between two circular rings, effective sealing is formed between the shield tail and the duct piece, muddy water is prevented from flowing into the shield machine, and the smooth tunneling process of the shield machine is ensured; after the coil is powered off, the magnetorheological fluid is quickly converted into Newtonian fluid, so that the viscosity of the Newtonian fluid is very low;
(6) secondary cleaning:
and cleaning the pipeline piston in time after the injection is finished.
2. The shield grouting wrapping method according to claim 1, characterized in that: in the step (1), the mixing ratio can be established according to actual conditions to adjust the coagulation time.
3. The shield grouting wrapping method according to claim 2, characterized in that: in the step (1), the pH value of the mixed solution or the mass fraction ratio of the pH value to the mass fraction ratio of the mixed solution is adjusted to adjust the coagulation time.
4. The shield grouting wrapping method according to claim 3, characterized in that: in the step (4), the value of K is 2.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287115.6A CN110005422B (en) | 2019-04-11 | 2019-04-11 | Shield grouting wrapping method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287115.6A CN110005422B (en) | 2019-04-11 | 2019-04-11 | Shield grouting wrapping method |
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| Publication Number | Publication Date |
|---|---|
| CN110005422A CN110005422A (en) | 2019-07-12 |
| CN110005422B true CN110005422B (en) | 2021-09-03 |
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| CN201910287115.6A Active CN110005422B (en) | 2019-04-11 | 2019-04-11 | Shield grouting wrapping method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110454194B (en) * | 2019-08-06 | 2021-08-24 | 中广核工程有限公司 | Secondary grouting method for shield construction |
| CN113216991A (en) * | 2021-04-26 | 2021-08-06 | 中建八局轨道交通建设有限公司 | Method for reinforcing collapsed soil in front of shield cutter head |
| CN114776323B (en) * | 2022-04-01 | 2023-04-11 | 成都未来智隧科技有限公司 | Method for controlling double compensation of stratum and stress loss of shield tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0647911B2 (en) * | 1988-03-11 | 1994-06-22 | 株式会社大林組 | Shield machine |
| CN104314580B (en) * | 2014-10-11 | 2016-07-06 | 北京铁五院工程机械有限公司 | The tail sealing brush monitoring shield tail grease cavity pressure and shield machine for shield machine |
| CN106907155A (en) * | 2017-03-24 | 2017-06-30 | 山东大学 | The prominent water burst film bag slip casting fast plugging device of shield tail and it is provided with the shield machine of the device |
| CN107382254A (en) * | 2017-08-01 | 2017-11-24 | 中铁工程装备集团技术服务有限公司 | A kind of novel slurry filling material suitable for shield method |
| CN107605498B (en) * | 2017-11-02 | 2023-08-22 | 中铁十局集团有限公司 | Construction method for horizontal grouting reinforcement structure of end head of shield tunnel in water-rich sandy pebble stratum |
| CN108643933A (en) * | 2018-04-27 | 2018-10-12 | 中铁十二局集团有限公司 | Shield receives portal reinforcement means |
| CN108678758A (en) * | 2018-04-28 | 2018-10-19 | 青岛新华友建工集团股份有限公司 | Major diameter slurry shield passes through shanty town settlement Control construction over long distances under the conditions of non-reinforced |
| CN108716410B (en) * | 2018-05-21 | 2020-05-05 | 宁波大学 | Mechanical method connecting channel high-strength elastic wall post-grouting slurry and grouting method |
| CN109534769A (en) * | 2018-12-14 | 2019-03-29 | 沈阳建筑大学 | A kind of application method of magnetorheological intelligent shield grouting material |
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