CN115095332A - Post-grouting system and method for pipe joint wall of U-shaped shield machine - Google Patents
Post-grouting system and method for pipe joint wall of U-shaped shield machine Download PDFInfo
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- CN115095332A CN115095332A CN202210411289.0A CN202210411289A CN115095332A CN 115095332 A CN115095332 A CN 115095332A CN 202210411289 A CN202210411289 A CN 202210411289A CN 115095332 A CN115095332 A CN 115095332A
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- 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
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- 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
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- 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
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- 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
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- Geochemistry & Mineralogy (AREA)
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a grouting system and a grouting method for a pipe joint wall of a U-shaped shield machine, which solve the problem of low fertilizer tank backfilling efficiency in U-shaped shield construction in the prior art. The invention discloses a U-shaped shield machine pipe joint post-grouting supporting system which comprises a flow state solidified soil preparation system, a shield tail sealing system and a grouting system, wherein the shield tail sealing system is detachably connected at a shield tail, the flow state solidified soil preparation system comprises a drying device, a screening and crushing device and a stirring device which are integrated in a front shield, the stirring device is communicated with an additive container, a curing agent container and a water tank, and the output end of the stirring device is communicated with the inlet end of the grouting system and extends backwards to the shield tail sealing system. The flow-state solidified soil preparation system is integrated in the front shield and matched with the front excavator to prepare the flow-state solidified soil, can be used for reasonable construction aiming at different working conditions, has high adaptability with a U-shaped shield machine, utilizes excavated soil to backfill a fertilizer groove, improves the grouting process and the construction efficiency, and reduces the construction cost.
Description
Technical Field
The invention relates to the technical field of construction of U-shaped shield machines, in particular to a post-grouting system and a post-grouting method for a pipe joint wall of a U-shaped shield machine.
Background
After the U-shaped shield machine is paved with the pipe joints and pushed forward, a gap (a fertilizer groove) with a certain width is generated between the side wall of the pipe joint and original-state soil, the gap needs to be backfilled in time, the soil body of the side wall is prevented from being unstable and collapsing, and the like. The back clearance of the pipe joint wall is backfilled with fluid solidified soil, which is one of the directions of cost reduction and efficiency improvement. The method for processing the backfill soil of the pipe gallery in the collapsible loess area with the publication number CN106638684 has the advantages of low adaptation degree and low working efficiency with a U-shaped shield machine although compaction grouting is performed on the backfill soil on two sides of the pipe gallery. The U-shaped shield machine pipe joint wall back grouting system is developed and integrated on a shield machine, and is necessary to be applied to filling pipe joint wall back gaps so as to improve construction efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a grouting system and a grouting method for the pipe joint wall of a U-shaped shield machine, which solve the problem of low fertilizer groove backfilling efficiency in U-shaped shield construction in the prior art.
The technical scheme of the invention is realized as follows: the utility model provides a U type shield constructs quick-witted tube coupling post-grouting support system, including flow state solidification soil preparation system, shield tail sealing system and slip casting system, shield tail sealing system can dismantle the connection in shield tail department, flow state solidification soil preparation system is including the integrated drying device in the front shield, screening breaker and agitating unit, drying device, screening breaker and agitating unit communicate in proper order, the last intercommunication of agitating unit has the admixture container, curing agent container and water tank, agitating unit's output and slip casting system's entrance point intercommunication and ranging back to shield tail sealing system.
Further, the shield tail sealing system comprises a tail shield mounting plate, at least two sealing structures are arranged on the tail shield mounting plate along the front and back of the tunneling direction of the shield tunneling machine, and a base plate is arranged between every two adjacent sealing structures.
The tail shield mounting plate is provided with two sealing structures, the front sealing structure is a polyurethane plate, and the rear sealing structure is a rubber plate; and a reinforcing plate is arranged at the joint of the polyurethane plate and the rubber plate with the tail shield mounting plate. Preferably, each sealing structure comprises a left side seal, a right side seal and a bottom seal, and the left side seal, the right side seal and the bottom seal form a sealing cavity structure with an upper opening.
As another preferred scheme, when the mixed slurry is backfilled into the fertilizer tank after the propulsion of the U-shaped shield machine is finished, the shield tail sealing system further comprises a sealing push plate, and the sealing push plate is in sliding connection with the middle shield or the tail shield through a pushing oil cylinder arranged along the axial direction; the tail shield mounting plate is arranged at the axial tail part of the sealing push plate.
Further, the slip casting system includes the tee bend blender, and an import and the flow state soil solidifying pipe who connects at agitating unit's output of tee bend blender are connected, another access connection has the additive pipeline, and the additive pipeline communicates with the additive container, and the exit end of tee bend blender is connected with mixes the thick liquid pipeline, and the liquid outlet that mixes the thick liquid pipeline extends to shield tail sealing system's rear. And flowmeters are arranged on the fluid solidified soil pipe, the additive pipeline, the slurry mixing pipeline and the pipeline of the water tank communicated with the stirring device.
The U-shaped shield tunneling machine pipe joint post-grouting system also comprises a forepoling excavator, and the forepoling excavator corresponds to the flow state solidified soil preparation system; and weighing mechanisms are arranged in the stirring device and the curing agent container.
A grouting method of a U-shaped shield tunneling machine pipe joint wall post-grouting system comprises the following steps:
s1 preparing fluid solidified soil: the method comprises the following steps that an advanced excavator sends an excavated soil body into a screening and crushing device directly or after being dried, the screening and crushing device carries out crushing and screening on the soil body, the screened partial soil body enters a stirring device according to a certain proportion, and a curing agent container and a water tank simultaneously add curing agent and water in a certain proportion into the stirring device; then the stirring device stirs the materials in the stirring device to form fluid solidified soil; the amount of the fluid-state solidified soil in the stirring device at least meets the backfill requirement of a circular tube sheet;
s2 grouting: respectively pumping the additive and the fluid-state solidified soil prepared in the step S1 into a three-way mixer of a grouting system, mixing to form mixed slurry, pumping the mixed slurry to the rear part of a shield tail sealing system through a slurry mixing pipeline, and backfilling a fertilizer tank;
s3 sealing: and S2, synchronously sealing the mixed slurry by the shield tail sealing system while grouting, and preventing the slurry from flowing back to the tail shield.
S4 flushing: after grouting, pumping water in the water tank to a stirring device, a fluid solidified soil pipe, a three-way mixer and a slurry mixing pipeline through a water pump for washing;
s5: and repeating the steps S1-S4 until all the segments are assembled.
As another embodiment: s1 preparing fluid solidified soil: the method comprises the following steps that an advanced excavator sends excavated soil bodies into a screening and crushing device directly or after drying, the screening and crushing device carries out crushing and screening on the soil bodies, screened partial soil bodies enter a stirring device according to a certain proportion, and an additive container, a curing agent container and a water tank are added with additives, curing agents and water in a certain proportion into the stirring device at the same time; then the stirring device stirs the materials in the stirring device to form fluid solidified soil; the amount of the fluid-state solidified soil in the stirring device at least meets the backfill requirement of a circular pipe piece;
s2 grouting: the fluid solidified soil prepared in the step S1 enters a grouting system to form mixed slurry, the mixed slurry is pumped to the rear part of the shield tail sealing system through a slurry mixing pipeline, and the fertilizer tank is backfilled;
s3 sealing: and S2, synchronously sealing the mixed slurry by the shield tail sealing system while grouting, and preventing the slurry from flowing back to the tail shield.
S4 flushing: after grouting, pumping water in the water tank to a stirring device, a fluid solidified soil pipe, a three-way mixer and a slurry mixing pipeline through a water pump for washing;
s5: and repeating the steps S1-S4 until all the segments are assembled.
The specific process of step S3 includes two conditions: injecting the mixed slurry into the fertilizer tank while propelling, and backfilling the mixed slurry into the fertilizer tank after propelling is finished;
the concrete process of injecting the mixed slurry into the fertilizer groove while propelling is as follows: when the laying of one pipe joint is finished, the mixed slurry is solidified, and the preparation of the fluid state solidified soil required by the next pipe joint is also finished in the stirring device; the U-shaped shield machine continues to advance, and meanwhile, the grouting system continues to inject mixed slurry into the advanced fertilizer tank, and the operation is circulated;
the concrete process of backfilling the mixed slurry into the fertilizer tank after the propelling is finished is as follows: when the laying of a section of pipe joint is finished and before the U-shaped shield machine starts to push the next ring, the mixed slurry is not solidified, a sealing push plate of the tail sealing system is pushed backwards and tightly against the laid pipe joint; the thrust cylinder pushes the shield tunneling machine to move forward, and the push plate is static relative to the pipe joint; after the pushing oil cylinder finishes pushing, the mixed slurry can be solidified, then the sealing push plate is retracted, the mixed slurry is injected into the pushed fertilizer groove, and the operation is circulated.
The flow-state solidified soil preparation system is integrated in the front shield and matched with the front excavator to prepare flow-state solidified soil, mixed slurry can be injected into the fertilizer tank while being pushed according to different working conditions or mixed slurry is backfilled into the fertilizer tank after the pushing is finished for grouting construction, the applicability is high, the adaptability with a U-shaped shield machine is high, the fertilizer tank is backfilled by utilizing excavated soil, the grouting process and the construction efficiency are greatly improved, and the construction cost is reduced. After the fluid-state solidified soil is solidified, the gap behind the wall is completely filled, the supporting strength and the waterproof effect are stronger, the raw material of the fluid-state solidified soil can be obtained from local materials, the material cost is low, and compared with a concrete filling construction method, the fluid-state solidified soil is convenient and fast to prepare and inject, the solidification time is short, the construction efficiency is improved, and the material cost is reduced.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an enlarged view of a portion of the grouting system of the present invention.
Fig. 3 is a view from a-a in fig. 1.
Fig. 4 is a view from B-B in fig. 1.
Fig. 5 is a schematic view of a shield tail sealing system with a sealing push plate.
FIG. 6 is a schematic diagram of the arrangement state of a fluidized solidified soil preparation system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, in example 1, a U-shaped shield machine pipe joint post-grouting support system includes a fluid solidified soil preparation system 1, a shield tail sealing system 2 and a grouting system 3, wherein the fluid solidified soil preparation system 1 is used for preparing fluid solidified soil; the shield tail sealing system 2 is used for sealing grouting slurry and preventing the grouting slurry from flowing back into the shield body. And the grouting system 3 is used for pumping prepared slurry at fixed points to realize efficient fertilizer tank backfilling. The shield tail sealing system 2 is detachably connected to the shield tail to prevent the slurry from flowing back to the shield body. The fluidized solidified soil preparation system 1 comprises a drying device 1-1, a screening and crushing device 1-2 and a stirring device 1-3 which are integrated in a front shield 4, wherein the drying device 1-1, the screening and crushing device 1-2 and the stirring device 1-3 are communicated in sequence. The drying device 1-1 is used for drying the wet soil body under excavation, and the screening and crushing device 1-2 is used for screening and crushing the soil body, and sending the soil meeting the requirement of the particle size after screening and crushing into the stirring and conveying device. The stirring device 1-3 is communicated with an additive container 1-4, a curing agent container 1-5 and a water tank 1-6; the stirring devices 1-3 and the curing agent containers 1-5 are internally provided with weighing mechanisms which can adopt the existing built-in weighing devices and are used for weighing the addition amount of materials in the equipment. The admixture (the admixture comprises a water reducing agent, water glass and the like) in the admixture container 1-4, the curing agent in the curing agent container 1-5 and the water in the water tank 1-6 are injected into the stirring device according to a certain proportion, and then the fluidized curing soil is formed under the stirring action of the stirring device. The soil body screening and crushing device, the water tank, the curing agent container and the additive container are respectively provided with a connecting valve at the bottom, materials of each part are added into the stirring device by opening the valves, and the containers and the lower part of the device are respectively provided with a weighing function so as to ensure the amount required by grouting after one-time injection of one ring pipe section wall. The output end of the stirring device 1-3 is communicated with the inlet end of the grouting system 3 and extends backwards to the shield tail sealing system 2. Pouring the fluid-state solidified soil into a gap (a fertilizer groove) with a certain width between the side wall of the pipe joint and the undisturbed soil under the action of a grouting system to finish backfilling; the shield tail sealing system 2 plays a sealing role at the same time, and prevents the backflow of the casting liquid. Above-mentioned structural design and U type shield structure machine adaptation degree are high, utilize the excavation soil to carry out the fertile groove and backfill, improve slip casting process and efficiency of construction greatly, have reduced construction cost simultaneously.
As shown in fig. 6, in embodiment 2, the system for supporting the pipe joint wall post-grouting of the U-shaped shield machine is based on embodiment 1, and the shield tail sealing system 2 includes a tail shield mounting plate 2-1, in this embodiment, the tail shield mounting plate is fixed on a tail shield of the U-shaped shield machine. At least two sealing structures are arranged on the tail shield mounting plate 2-1 in the front and back direction of the tunneling direction of the shield tunneling machine, and the number of the sealing structures can be increased as required. And a base plate 2-2 is arranged between two adjacent sealing structures, so that the sealing effect is improved.
As shown in fig. 3 and 4, in this embodiment, two sealing structures are arranged on the tail shield mounting plate 2-1, and both the two sealing structures are fixed on the tail shield mounting plate by bolts. In order to improve the wear resistance and the sealing property, the front sealing structure is a polyurethane plate 2-3, and the rear sealing structure is a rubber plate 2-4. A reinforcing plate 2-5 is arranged at the joint of the polyurethane plate 2-3, the rubber plate 2-4 and the tail shield mounting plate 2-1; the arrangement of the reinforcing plate can improve the wear resistance of the polyurethane plate 2-3 and the rubber plate 2-4 and the strength and the sealing property of the polyurethane plate and the rubber plate. Each sealing structure in the embodiment comprises a left sealing 21, a right sealing 22 and a bottom sealing 23, and the left sealing 21, the right sealing 22 and the bottom sealing 23 form a sealing cavity structure with an upper opening. Specifically, the method comprises the following steps: one end of the right seal is fixed on the mounting plate, and the other end of the right seal extends out of the pipe joint wall to be pressed, so that the flow state solidified soil is prevented from flowing out along the pipe joint wall; one end of the bottom seal is fixed on the mounting plate, and the other end of the bottom seal extends out to press the ground and the left undisturbed soil, so that the fluidized solidified soil is prevented from flowing out along the bottom ground and the left undisturbed soil; left side sealed one end is fixed on the mounting panel, and the other end stretches out and compresses tightly left side original state soil, prevents that flow state solidification soil from flowing along left side original state soil.
As shown in fig. 5, in embodiment 3, based on embodiment 2, the U-shaped shield machine pipe joint wall post-grouting support system further includes a lead excavator 5, and the lead excavator 5 corresponds to the fluid solidified soil preparation system 1; namely, the advanced excavator 5 is positioned in front of the U-shaped shield machine to perform advanced excavation, and the excavated soil body is sent to the drying device or the screening and crushing device 1-2 to prepare for preparing the fluid-state solidified soil. In this embodiment, a weighing mechanism is arranged in the stirring device 1-3, and the weighing mechanism is used for measuring the weight of the material entering the stirring device, so as to ensure the precision of preparing the fluid solidified soil.
In the embodiment, when the mixed slurry is backfilled into the fertilizer groove after the propulsion of the U-shaped shield tunneling machine is finished, the shield tail sealing system 2 further comprises a sealing push plate 24, and the sealing push plate 24 is in sliding connection with the middle shield or the tail shield through a pushing oil cylinder 25 arranged along the axial direction; the tail shield mounting plate 2-1 is mounted at the axial tail part of the sealing push plate 24. In the embodiment, the pushing oil cylinder 25 is arranged at the tail shield, the push plate is fixed on the pushing oil cylinder and moves along with the pushing oil cylinder, a shield tail sealing device is arranged at the tail part of the sealing push plate, when a pipe joint is paved, fluid solidified soil cannot be solidified before the next ring is pushed, the pushing oil cylinder pushes the shield machine to move forwards, the push plate is static relative to the pipe joint, after the fluid solidified soil is solidified, the pushing oil cylinder is generally pushed to finish, the fluid solidified soil can be solidified, at the moment, the pushing oil cylinder retracts the push plate again, the fluid solidified soil is filled, a new pipe joint is placed, the next ring is prepared for pushing, and the whole process is circulated until the whole process is completed.
In the embodiment, as shown in fig. 2, the grouting system 3 comprises a three-way mixer 3-1, one inlet of the three-way mixer 3-1 is connected with a fluid-state solidified soil pipe 3-2 connected to the output end of the stirring device 1-3, the other inlet is connected with an additive pipeline 3-3, and the additive pipeline 3-3 is communicated with an additive container 1-4. The additive can be water glass, and the water glass has the function of reducing the solidification time of the fluid solidified soil. Mixing the fluid solidified soil and the water glass, and then leading the mixture to reach a grouting opening through a pipeline to perform grouting on the wall. The outlet end of the three-way mixer 3-1 is connected with a slurry mixing pipeline 3-4, and the liquid outlet of the slurry mixing pipeline 3-4 extends to the rear of the shield tail sealing system 2. And flowmeters are arranged on the pipelines of the fluidized solidified soil pipe 3-2, the additive pipeline 3-3, the slurry mixing pipeline 3-4 and the water tank 1-6 communicated with the stirring device 1-3, so that the grouting amount is ensured, and the grouting quality is improved. In the construction process, the admixture in the admixture container can enter the stirring devices 1-3 to be fully stirred and mixed with other materials, and then the mixture is directly filled into the fertilizer tank through the fluidized solidified soil pipe and the slurry mixing pipeline, and under the condition, the three-way mixer can be removed.
In addition, the adding mode of the water glass determines two fluid state solidified soil manufacturing processes, which are respectively as follows: 1. the water glass and other ingredients are directly added into the stirring and conveying device together, and are mixed and uniformly stirred in the stirring and conveying device, so that the water glass is generally added into the stirring and conveying device at last in order to prevent the fluidized solidified soil from being solidified prematurely or changing the state, such as segregation and the like; 2. except water glass, other ingredients are added into the stirring and conveying device together for mixing and stirring uniformly, and when the fluidized solidified soil is to be backfilled, the water glass and other materials which are mixed and stirred uniformly in the stirring and conveying device are mixed through a pipeline and then are injected into the pipe gallery fertilizer trough together.
s1 preparing fluid solidified soil: the method comprises the following steps that an advanced excavator 5 directly or after drying, sends excavated soil bodies into a screening and crushing device 1-2, the screening and crushing device 1-2 carries out screening and crushing on the soil bodies, screened partial soil bodies enter a stirring device 1-3 according to a certain proportion, and an additive container 1-4, a curing agent container 1-5 and a water tank 1-6 simultaneously add additives, curing agents and water into the stirring device 1-3 according to a certain proportion. The admixture in the admixture containers 1 to 4 may be added to the material prepared by the stirring apparatus through a mixer during the grouting. Then the stirring device 1-3 stirs the materials in the container to form fluid solidified soil; the amount of the fluid state solidified soil in the stirring device 1-3 at least meets the backfill requirement of a circular pipe piece. Specific examples are as follows: firstly, injecting a kilogram of water into a stirring device, wherein the stirring device has a weighing function, and stopping injecting water when the weight is increased to a kilogram; the excavator sends into soil body screening breaker after will excavating soil is direct or dry in, and soil body screening breaker sieves the original state soil, and the soil that the particle diameter meets the requirements is sent into agitating unit and is stirred, if the soil of b kilograms is needed, then stops when agitating unit weighing function shows that weight increases b kilograms and adds soil. The curing agent container is opened, the connecting valve of the additive container bottom and the stirring device is opened, quantitative materials are injected into the stirring device, for example, the flow state solidified soil required for filling the gap of the ring pipe joint is composed of x kilograms of curing agent, y kilograms of additive and other materials, the valve of the material container is opened, the materials fall into the stirring device from the material container, when the weighing function shows that the weight of the materials falling into the container reaches x kilograms and y kilograms, the valve is closed, so that the material injection is completed, then the stirring device stirs the mixed materials to a certain time, and the flow state solidified soil required for filling the gap after the ring pipe joint wall is prepared. After the materials are added, the curing agent container, the additive container and the like on the top are lost, and the materials can be added into the curing agent container, the additive container and the like again while the stirring device is used for stirring, so that the preparation is prepared for the next feeding.
S2 grouting: when the admixture is not added with a stirring device in the step S1, the admixture and the fluidized solidified soil prepared in the step S1 in the next step are respectively pumped into a three-way mixer 3-1 of the grouting system 3, mixed slurry is formed after mixing, the mixed slurry is pumped to the rear part of the shield tail sealing system 2 through a slurry mixing pipeline 3-4, and fertilizer tank backfilling is carried out. The method specifically comprises the following steps: the prepared fluid solidified soil and water glass are respectively pumped to a grouting mixer while the U-shaped shield machine is propelled forwards, so that the fluid solidified soil and the water glass are fully mixed, the water glass has the effect of reducing the solidification time of the fluid solidified soil, and the fluid solidified soil and the water glass are mixed and then reach a grouting opening through a pipeline to perform grouting backwards. And stopping when the U-shaped shield machine advances to the width of one pipe joint, starting to lay the pipe joint, waiting for solidification of the fluid solidified soil after grouting is finished, and starting to prepare the fluid solidified soil required by the next pipe joint by the fluid solidified soil preparation system. When the pipe joints are laid, the fluid-state solidified soil is solidified, the fluid-state solidified soil required by a new pipe joint is stirred in the stirring device, the U-shaped shield machine is pushed forward again, the pumping equipment extracts the fluid-state solidified soil and the water glass again to perform mixed grouting, and the operation is circulated. In addition, as a grouting process transformation technical scheme, water glass can be directly injected into the stirring device through the additive container, and the fluidized solidified soil and the water glass are fully stirred and then pumped into the wall, so that a grouting mixer is not needed.
S3 sealing: and S2, synchronously sealing the mixed slurry by the shield tail sealing system 2 while grouting, and preventing the slurry from flowing back to the tail shield.
S4 flushing: after grouting is finished, pumping water in the water tank to a stirring device 1-3, a fluidized solidified soil pipe 3-2, a three-way mixer 3-1 and a slurry mixing pipeline 3-4 through a water pump, and flushing the slurry;
s5: and repeating the steps S1-S3 until all the segments are assembled.
The specific process of step S3 includes two operating conditions: injecting the mixed slurry into the fertilizer tank while propelling, and backfilling the mixed slurry into the fertilizer tank after propelling is finished;
the concrete process of injecting the mixed slurry into the fertilizer groove while propelling is as follows: when the laying of one pipe joint is finished, the mixed slurry is solidified, and the preparation of the fluid state solidified soil required by the next pipe joint is also finished in the stirring device; the U-shaped shield machine continues to be pushed forward, and meanwhile, the grouting system continues to inject mixed slurry into the pushed fertilizer tank, and the operation is circulated;
the concrete process of backfilling the mixed slurry into the fertilizer tank after the propelling is finished is as follows: when the laying of a pipe joint is finished and before the U-shaped shield machine starts to push the next ring, the mixed slurry is not solidified, the sealing push plate 24 of the tail sealing system 2 is pushed backwards and tightly against the laid pipe joint; the thrust cylinder pushes the shield tunneling machine to move forward, and the push plate is static relative to the pipe joint; after the propulsion oil cylinder finishes propulsion, the mixed slurry can be solidified, then the sealing push plate 24 is retracted, the mixed slurry is injected into the propelled fertilizer tank, and the operation is circulated. In other words, the propulsion oil cylinder retracts, and simultaneously starts to be filled with the fluid-state solidified soil and the pipe joint is lowered, so that the pipe joint is lowered, the fluid-state solidified soil is not solidified and can only be propelled first, and the propulsion oil cylinder retracts after the propulsion oil cylinder finishes pushing, and the push plate is sealed; the time is saved for curing the mixed slurry, and the tunneling construction of the U-shaped shield machine is not delayed, so that the construction efficiency is further improved.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The utility model provides a slip casting system behind U type shield constructs quick-witted tube coupling wall which characterized in that: the shield tail sealing system (2) is detachably connected to a shield tail, the flow state solidified soil preparation system (1) comprises a drying device (1-1) integrated in a front shield (4), a screening and crushing device (1-2) and a stirring device (1-3), the drying device (1-1), the screening and crushing device (1-2) and the stirring device (1-3) are sequentially communicated, the stirring device (1-3) is communicated with an additive container (1-4), a curing agent container (1-5) and a water tank (1-6), and the output end of the stirring device (1-3) is communicated with the inlet end of the grouting system (3) and extends backwards to the shield tail sealing system (2).
2. The U-shaped shield tunneling machine pipe joint grouting system according to claim 1, characterized in that: the shield tail sealing system (2) comprises a tail shield mounting plate (2-1), at least two sealing structures are arranged on the tail shield mounting plate (2-1) in the front and back direction of the tunneling direction of the shield tunneling machine, and a base plate (2-2) is arranged between every two adjacent sealing structures.
3. The U-shaped shield tunneling machine pipe joint grouting system according to claim 2, characterized in that: when the mixed slurry is backfilled into the fertilizer groove after the U-shaped shield machine finishes propelling, the shield tail sealing system (2) further comprises a sealing push plate (24), and the sealing push plate (24) is in sliding connection with the middle shield (6) or the tail shield (7) through a pushing oil cylinder (25) arranged along the axial direction; the tail shield mounting plate (2-1) is mounted at the axial tail part of the sealing push plate (24).
4. The U-shaped shield tunneling machine pipe joint grouting system according to claim 2, characterized in that: the tail shield mounting plate (2-1) is provided with two sealing structures, the front sealing structure is a polyurethane plate (2-3), and the rear sealing structure is a rubber plate (2-4); the joint of the polyurethane plate (2-3) and the rubber plate (2-4) and the tail shield mounting plate (2-1) is provided with a reinforcing plate (2-5).
5. The U-shaped shield tunneling machine pipe joint grouting system according to claim 2, 3 or 4, wherein: each sealing structure comprises a left sealing (21), a right sealing (22) and a bottom sealing (23), and the left sealing (21), the right sealing (22) and the bottom sealing (23) form a sealing cavity structure with an upper opening.
6. The U-shaped shield tunneling machine pipe joint grouting system according to claim 1, 2 or 5, wherein: the grouting system (3) comprises a three-way mixer (3-1), one inlet of the three-way mixer (3-1) is connected with a fluidized solidified soil pipe (3-2) connected to the output end of the stirring device (1-3), the other inlet is connected with an additive pipeline (3-3), the additive pipeline (3-3) is communicated with an additive container (1-4), the outlet end of the three-way mixer (3-1) is connected with a slurry mixing pipeline (3-4), and the liquid outlet of the slurry mixing pipeline (3-4) extends to the rear of the shield tail sealing system (2).
7. The U-shaped shield tunneling machine pipe joint grouting system according to claim 6, characterized in that: and flowmeters are arranged on the pipelines of the flow state solidified soil pipe (3-2), the additive pipeline (3-3), the slurry mixing pipeline (3-4) and the water tank (1-6) which are communicated with the stirring device (1-3).
8. The U-shaped shield tunneling machine pipe section grouting system according to claim 1, 2, 5 or 7, wherein: the system also comprises an advanced excavator (5), wherein the advanced excavator (5) corresponds to the fluid state solidified soil preparation system (1); weighing mechanisms are arranged in the stirring devices (1-3) and the curing agent containers (1-5).
9. The grouting method of the U-shaped shield tunneling machine pipe joint wall back grouting system according to claim 8, characterized in that: the method comprises the following steps:
s1 preparing fluidized solidified soil: an advanced excavator (5) directly or after drying the excavated soil body is sent into a screening and crushing device (1-2), the screening and crushing device (1-2) carries out crushing and screening on the soil body, the screened partial soil body enters a stirring device (1-3) according to a certain proportion, and a curing agent container (1-5) and a water tank (1-6) simultaneously add a certain proportion of curing agent and water into the stirring device (1-3); then the stirring device (1-3) stirs the materials in the container to form fluid solidified soil; the amount of the fluid state solidified soil in the stirring device (1-3) at least meets the backfill requirement of a ring pipe slice;
s2 grouting: the admixture in the admixture container (1-4) and the fluid solidified soil prepared in the step S1 are respectively pumped into a three-way mixer (3-1) of a grouting system (3) and mixed to form mixed slurry, and the mixed slurry is pumped to the rear part of a shield tail sealing system (2) through a slurry mixing pipeline (3-4) to carry out fertilizer tank backfilling;
s3 sealing: step S2, synchronously sealing the mixed slurry by the shield tail sealing system (2) while grouting, and preventing the slurry from flowing back to the tail shield;
s4 flushing: after grouting is finished, water in the water tank is pumped to the stirring device (1-3), the fluidized solidified soil pipe (3-2), the three-way mixer (3-1) and the slurry mixing pipeline (3-4) through the water pump for flushing;
s5: and repeating the steps S1-S4 until all the segments are assembled.
10. The grouting method of the U-shaped shield tunneling machine pipe joint wall back grouting system according to claim 8, characterized in that: the method comprises the following steps:
s1 preparing fluid solidified soil: the method comprises the following steps that an advanced excavator (5) directly or after drying, an excavated soil body is sent into a screening and crushing device (1-2), the screening and crushing device (1-2) carries out crushing and screening on the soil body, a screened part of the soil body enters a stirring device (1-3) according to a certain proportion, and an additive container (1-4), a curing agent container (1-5) and a water tank (1-6) simultaneously add an additive, a curing agent and water into the stirring device (1-3) according to a certain proportion; then the stirring device (1-3) stirs the materials in the container to form fluid solidified soil; the amount of the fluid-state solidified soil in the stirring device (1-3) at least meets the backfill requirement of a circular tube piece;
s2 grouting: the fluid solidified soil prepared in the step S1 enters a grouting system (3), is pumped to the rear part of a shield tail sealing system (2) through a slurry mixing pipeline (3-4), and is backfilled with a fertilizer tank;
s3 sealing: step S2, synchronously sealing the fluid solidified soil slurry by the shield tail sealing system (2) while grouting, and preventing the slurry from flowing back to the tail shield;
s4 flushing: after grouting, pumping water in the water tank to a stirring device (1-3), a fluid solidified soil pipe (3-2), a three-way mixer (3-1) and a slurry mixing pipeline (3-4) through a water pump for flushing;
s5: and repeating the steps S1-S4 until all the segments are assembled.
11. The grouting method of the U-shaped shield tunneling machine pipe joint grouting system according to claim 9 or 10, wherein: the specific process of step S3 includes two conditions: injecting the mixed slurry into the fertilizer tank while propelling, and backfilling the mixed slurry into the fertilizer tank after propelling is finished;
the concrete process of injecting the mixed slurry into the fertilizer groove while propelling is as follows: when the laying of one pipe joint is finished, the mixed slurry is solidified, and the preparation of the fluid state solidified soil required by the next pipe joint is also finished in the stirring device; the U-shaped shield machine continues to be pushed forward, and meanwhile, the grouting system continues to inject mixed slurry into the pushed fertilizer tank, and the operation is circulated;
the concrete process of backfilling the mixed slurry into the fertilizer groove after propelling is as follows: when the laying of a pipe joint is finished and before the U-shaped shield machine starts to push the next ring, the mixed slurry is not solidified, a sealing push plate (24) of the shield tail sealing system (2) is pushed backwards and tightly propped against the laid pipe joint; the thrust cylinder pushes the shield tunneling machine to move forward, and the push plate is static relative to the pipe joint; after the pushing oil cylinder is pushed, the mixed slurry can be solidified, then the sealing push plate (24) is retracted, the mixed slurry is injected into the pushed fertilizer tank, and the operation is circulated.
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Cited By (1)
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