CN113153321B - Muck improvement system for shield construction and construction method thereof - Google Patents
Muck improvement system for shield construction and construction method thereof Download PDFInfo
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- CN113153321B CN113153321B CN202110337944.8A CN202110337944A CN113153321B CN 113153321 B CN113153321 B CN 113153321B CN 202110337944 A CN202110337944 A CN 202110337944A CN 113153321 B CN113153321 B CN 113153321B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/124—Helical conveying means therefor
Abstract
The invention provides a muck improving system used in shield construction, wherein a shield machine tunnels from an originating well to a soil body to be constructed to form a tunnel, and the muck improving system comprises: the bentonite pond is arranged in the starting well, and bentonite slurry is added into the bentonite pond; one end of the bentonite slurry is communicated with the bentonite pool, and the other end of the bentonite slurry is communicated to a first pipeline at a cutter head of the shield tunneling machine; and a centrifugal pump mounted to the first pipe. The invention facilitates the muck reconstruction of the water-rich stratum in the shield construction, and achieves the aim of smoothly performing the shield construction.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a muck improvement system for shield construction and a construction method thereof.
Background
With the continuous development of cities, more and more cases of tunnel construction of the shield tunneling machine appear in the construction process of urban rail transit, but the tunnel construction process of the shield tunneling machine has abundant underground water content, so that the whole shield tunneling machine is in abundant underground water in the excavation process, and faults are easy to occur; meanwhile, various rainwater pipelines, dark culverts, rainfall and the like on the earth surface can provide abundant groundwater supply for the stratum, the shield machine can carry out 'muck improvement' by means of self power, and structural parts such as hinged oil cylinders, hinged seals and the like at weak parts of the shield machine are easily damaged under the condition of overlarge self power, the muck improvement time is long, the influence on the stratum and the surrounding environment is large, and the stratum and surrounding buildings are easily settled in the construction engineering, so that safety accidents are caused.
Disclosure of Invention
In view of the above situation, the present invention provides a muck improving system for shield construction, which solves the technical problems that the traditional shield machine is difficult to tunnel in the water-rich stratum and the stratum is easy to collapse, and facilitates the muck improvement of the water-rich stratum in the shield construction, so as to achieve the purpose of smoothly performing the shield construction.
In order to achieve the purpose, the invention adopts the technical scheme that:
a muck reclamation system for use in shield construction, a shield machine driving from an originating well into a body of soil to be constructed to form a tunnel, comprising:
the bentonite pond is arranged in the originating well, and bentonite slurry is added into the bentonite pond;
one end of the first pipeline is communicated with the bentonite tank, the other end of the first pipeline is communicated with the cutter head of the shield tunneling machine, bentonite slurry is conveyed to the cutter head of the shield tunneling machine through the first pipeline and enters the excavation surface of the tunnel to adsorb moisture of the excavation surface, and therefore the plasticity of soil of the excavation surface is improved; and
a centrifugal pump mounted to the first conduit.
The invention is used for the further improvement of the muck improving system in shield construction, and the side wall of the excavated tunnel is stuck with a plurality of segments, and the segments are provided with radial holes; the residue soil improvement system further comprises a mud effect-restraining container, a second pipeline and a mud effect-restraining pump, wherein the mud effect-restraining container is arranged in the tunnel and contains mud effect-restraining slurry, one end of the second pipeline is communicated with the mud effect-restraining container, the other end of the second pipeline is communicated to the radial hole, the mud effect-restraining pump is installed on the second pipeline, the mud effect-restraining slurry is conveyed to the soil body on the outer side of the pipe piece through the second pipeline to absorb water in the soil body, and therefore plasticity of the soil body is improved.
The invention is further improved in the muck improving system used in shield construction, and also comprises a water glass container which is arranged in the tunnel and contains water glass slurry, a third pipeline with one end communicated with the water glass container and the other end communicated with a cutter head of the shield machine, and a water glass pump arranged on the third pipeline; and the water glass slurry of the water glass container is conveyed to a cutter head of the shield tunneling machine through the third pipeline and enters the excavation surface of the tunnel to adsorb the moisture of the excavation surface, so that the plasticity of the soil of the excavation surface is improved.
The invention further provides a muck improving system for shield construction, which is characterized by further comprising a plurality of sleeve valve pipes extending from the ground to a tunnel to be constructed, wherein a plurality of through holes are formed in pipe bodies of the sleeve valve pipes at intervals, and grouting is performed on the top of the tunnel through the sleeve valve pipes so as to form a grouting layer on the top of the tunnel.
The invention is used for the further improvement of the muck improving system in the shield construction, and the shield machine is provided with a screw conveyer to convey the muck in the soil bin of the shield machine outwards; the muck improvement system further comprises a first branch pipe, one end of the first branch pipe is communicated with the first pipeline, the other end of the first branch pipe is communicated with the outlet of the screw conveyer, and the bentonite slurry is conveyed to the outlet of the screw conveyer through the first branch pipe so as to adsorb moisture of muck conveyed by the screw conveyer, so that the plasticity of the muck is improved.
The invention further provides a muck improving system used in shield construction, which is improved in that the muck improving system further comprises a second branch pipe, one end of the second branch pipe is communicated with the first pipeline, the other end of the second branch pipe is communicated with a cutter head of the shield machine, and bentonite slurry is conveyed to the cutter head of the shield machine through the second branch pipe and then enters an excavation surface of a tunnel to adsorb moisture of the excavation surface, so that the plasticity of the soil quality of the excavation surface is improved.
The invention is used for the further improvement of the muck improving system in the shield construction, wherein a soil bin is formed at the part of the shield machine close to the cutter head to contain the muck excavated by the cutter head; the muck improvement system further comprises a third branch pipe, one end of the third branch pipe is communicated with the first pipeline, the other end of the third branch pipe is communicated with the soil bin inlet, and the bentonite slurry is conveyed to the soil bin inlet through the third branch pipe to adsorb moisture of muck to enter the soil bin, so that the plasticity of the muck is improved.
The invention is further improved in the muck improving system used in shield construction, and also comprises a foaming agent barrel which is arranged in the tunnel and contains foaming agent, and a foaming pipe, one end of which is communicated with the foaming agent barrel, and the other end of which is communicated with the first pipeline; the foaming agent in the foaming agent barrel is conveyed to the first pipeline through the foaming pipe to be mixed with the bentonite slurry in the first pipeline.
The construction method of the muck improving system used in shield construction further comprises a mud effect restraining container which is arranged in the tunnel and contains mud effect restraining slurry, a second pipeline of which one end is communicated with the mud effect restraining container and the other end is communicated to the radial hole, and a mud effect restraining pump which is arranged on the second pipeline; and opening the centrifugal pump, conveying bentonite slurry to a cutter head of the shield tunneling machine through the first pipeline, and enabling the bentonite slurry to enter the excavation surface of the tunnel so as to adsorb moisture of the excavation surface, thereby improving the plasticity of the soil quality of the excavation surface.
A construction method of a muck improvement system used in shield construction comprises the following steps: arranging a mud-effect-restraining container for containing mud-effect-restraining slurry in the tunnel, communicating one end of the second pipeline with the mud-effect-restraining container, communicating the other end of the second pipeline with the radial hole, and arranging a mud-effect-restraining pump in the second pipeline; and starting the mud effect-restraining pump, and conveying the mud effect-restraining slurry into soil on the outer side of the duct piece through the second pipeline to adsorb moisture in the soil, so that the plasticity of the soil is improved.
The muck improvement system for shield construction builds the bentonite pool in the shield machine starting well, and conveys the bentonite to the excavation surface, the muck bin, the screw conveyer and the like of the shield construction, so that the muck improvement is carried out on the part to be constructed of the tunnel in multiple directions, the influence on the normal use of the shield machine due to the excessive water content in the muck is prevented, and the safety of the tunnel is improved; the invention also carries out grouting on different parts of the section to be constructed of the tunnel in advance through the sleeve valve pipes, thereby improving partial sections caused by natural phenomena such as underground rivers, karst accumulated water, air-entrained water and the like, preventing safety accidents caused by ground collapse due to the action of gravity in the tunnel construction process, and simultaneously improving the muck in the top part range of the constructed tunnel by the sleeve valve pipes, thereby improving the safety of the soil environment around the tunnel, preventing the water seepage of the upper layer of the tunnel from greatly permeating into the tunnel and damaging the constructed tunnel; the invention improves the stratum around the tunnel through the mud-restraining effect, thereby effectively preventing the occurrence of accidents such as gushing, collapse and the like in the shield construction process.
Drawings
Fig. 1 is a sectional view of a muck reclamation system for shield construction in a shield machine according to the present invention.
Fig. 2 is an enlarged schematic view at a in fig. 1.
Fig. 3 is a sectional view of a portion B-B of fig. 1.
Fig. 4 is a sectional view of the portion C-C in fig. 1.
Fig. 5 is a schematic view of a bentonite pond in a muck reclamation system for use in shield construction according to the present invention.
Fig. 6 is a side sectional view of a sleeve valve pipe of the muck reclamation system used in shield construction in accordance with the present invention.
Fig. 7 is a top view of the sleeve valve pipe of the muck upgrading system for shield construction according to the present invention.
Fig. 8 is a front view after tunnel construction is completed.
The correspondence of reference numerals to components is as follows: the bentonite pond 11, the centrifugal pump 12, the first pipeline 13, the first branch pipe 131, the second branch pipe 132, the third branch pipe 133, the bentonite jar 14, the foaming agent bucket 15, the extrusion pump 16, the gram mud effect container 21, the second pipeline 22, the first gram mud effect port 221, the second gram mud effect port 222, the third gram mud effect port 223, the water glass container 31, the third pipeline 32, the sleeve valve pipe 41, the first grouting port 411, the second grouting port 412, the third grouting port 413, the first grouting layer 42, the second grouting layer 43, the tunnel 5 and the underdrain 6.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
As shown in fig. 1, 2 and 5, the present invention provides a muck improving system for use in shield construction, in which a shield machine tunnels from an originating well to a soil body to be constructed to form a tunnel, comprising: the bentonite pool 11 is arranged in an initial well of the shield machine, and bentonite slurry is added into the bentonite pool 11; one end of the first pipeline is communicated with the bentonite pool 11, the other end of the first pipeline is communicated with the first pipeline 13 at the cutter head of the shield tunneling machine, bentonite slurry is conveyed to the cutter head of the shield tunneling machine through the first pipeline 13 and enters the excavation surface of the tunnel to adsorb moisture of the excavation surface, and therefore the plasticity of soil quality of the excavation surface is improved; and a centrifugal pump 12 installed at the first pipe 13 to accelerate the bentonite slurry entering the first pipe 13 by the centrifugal pump 12, thereby enabling the bentonite slurry to be transported to the excavated surface.
The muck improving system for the water-rich stratum disclosed by the invention is arranged outside the shield machine, so that the muck improving system of the shield machine and the muck improving system of the shield machine work together in shield construction, and therefore, the soil environment around the tunnel is improved in all directions before, during and after the tunnel is excavated in the tunnel construction process, the safety of tunnel construction is improved, the loss of the shield machine is reduced, and the engineering cost is saved.
Preferably, as shown in fig. 5, the starting well of the shield machine is a double-layer building structure, and each layer is provided with a bentonite pool 11 and a centrifugal pump 12, one end of the first pipeline 13 is connected to the bentonite pool on the upper layer, and is connected to the bentonite pool on the bottom layer through the centrifugal pump on the upper layer, and then is connected to the centrifugal pump on the bottom layer and extends to the tunnel to be constructed, so that the bentonite can be quickly supplemented through the two constructed bentonite pools 11, thereby preventing the local improvement effect from being poor due to untimely bentonite supplement in the slag improvement process, affecting the construction of the shield machine, and also preventing the centrifugal pump 12 from idling, and further preventing the equipment from being damaged.
A preferred embodiment of the muck improvement system for shield construction of the present invention is that, as shown in fig. 1, a plurality of segments are attached to the side wall of an excavated tunnel, and radial holes are formed in the segments; the residue soil improvement system further comprises a g mud effect container 21, a second pipeline 22 and a g mud effect pump, wherein the g mud effect container 21, one end of the g mud effect container 21 and the other end of the g mud effect container are communicated with the radial hole, the g mud effect pump is installed on the second pipeline 22, the g mud effect slurry is conveyed to the soil body on the outer side of the pipe piece through the second pipeline 22, water in the soil body is adsorbed, and the plasticity of the soil body is improved.
Specifically, as shown in fig. 2, 3 and 4, the outlet of the second pipeline 22 is located at the B-B section of the shield machine and is a first mud-restraining port 221, meanwhile, the second pipeline 22 is provided with a second mud-restraining port 222 at the C-C section of the shield machine through a section of branch pipe, the second pipeline 22 is provided with a third mud-restraining port 223 at the D-D section of the shield machine through another section of branch pipe, and the first mud-restraining port 221, the second mud-restraining port 222 and the third mud-restraining port 223 are respectively and oppositely arranged in the radial holes of the segments, so that mud-restraining materials are respectively injected into the outer sides of the segments through the mud-restraining ports to improve the tunnel soil around the tunnel, thereby preventing the upper building of the constructed tunnel from settling; and the mud-restraining ports are used for injecting the mud-restraining port simultaneously, so that the phenomenon that the shield machine gushes due to overlarge water content in the excavating process is effectively prevented, and the shield machine is effectively protected.
Preferably, the inner wall of the tunnel is paved with segments to form the tunnel 5; the shield constructs the machine and is located the tunnel, and the section of jurisdiction is laid the inner wall in the tunnel through the shield structure machine.
Preferably, the gram-effect container 21 is arranged at the sixth trolley; the radial bore of the segment matches the diameter of the second conduit 22.
Preferably, the weight ratio of the mud effect powder to the water is 450kg:825L of slurry with high viscosity and gram mud effect is mixed in proportion, then the slurry is respectively sent to a shield construction site, and is injected into a construction part through a radial hole of a segment, and a gap between the excavation diameter and the shield diameter is filled; soil quality of the mixed mud effect slurry is not easy to be diluted by water, and the viscosity strength of the mixed mud effect slurry does not change along with time, the mud effect is injected before the first mud effect port 221 in construction, the effects of sealing and stopping water and supporting a soil body above a shield body are achieved, settlement is reduced, locking of a shield machine is avoided, and subsequent injection is continued; and then, injecting mud into the mud-blocking effect port 222 and the mud-blocking effect port 223 in the second mud-blocking effect port and the third mud-blocking effect port to block the rear water catchment of the tunnel and fill the gap between the tunnel and the soil body, punching holes on the tunnel segment in advance before secondary grouting, observing whether water exists on the back of the segment, if water exists, performing mud-blocking effect conveying operation, ensuring that the back of the 5-segment of the tunnel is tightly filled, and assisting water stopping.
Further, as shown in fig. 1, the system further comprises a water glass container 31 which is arranged in the tunnel and contains water glass slurry, a third pipeline 32 of which one end is communicated with the water glass container 31 and the other end is communicated with a cutter head of the shield tunneling machine, and a water glass pump which is arranged on the third pipeline 32; and the water glass slurry of the water glass container is conveyed to a cutter head of the shield tunneling machine through a third pipeline 32 and enters the excavation surface of the tunnel to adsorb moisture on the excavation surface, so that the plasticity of soil quality of the excavation surface is improved.
Preferably, the water glass container 31 is installed at the sixth trolley of the shield, water glass is injected into the excavation surface of the tunnel, water glass slurry can rapidly absorb moisture in the region to be excavated by the shield machine, silicic acid gel is formed to plasticize the soil body, so that the shield machine can be conveniently excavated, and the shield machine is prevented from being immersed in a large amount of water in the excavation process, thereby preventing the shield machine from being difficult to propel and affecting the construction efficiency.
Further, as shown in fig. 6, the sleeve valve pipe system further includes a plurality of sleeve valve pipes 41 extending from the ground to the tunnel to be constructed, a plurality of through holes are formed at intervals in pipe bodies of the sleeve valve pipes 41, and grouting is performed to the top of the tunnel through the sleeve valve pipes 41, so that a grouting layer is formed at the top of the tunnel.
Preferably, as shown in fig. 7, the sleeve valve tubes 41 are arranged along the extending direction of the tunnel, and are sequentially divided into a first grouting opening 411, a second grouting opening 412 and a third grouting opening 413 according to the grouting sequence of the sleeve valve tubes, and the sleeve valve tubes 41 are obliquely arranged towards the top of the tunnel, so that a grouting layer is formed at the top of the tunnel, and gaps are prevented from being formed in the process of converging grouting materials of the sleeve valve tubes 41 at two sides of the tunnel, so that water seepage enters the tunnel from the gaps and the safety of the tunnel is affected.
Preferably, as shown in fig. 6 and 8, a first grouting port 411 and a second grouting port 412 are used to perform grouting to a tunnel to be constructed to improve the ground layer of the tunnel to be constructed, thereby performing shield construction to form a tunnel, and then a third grouting port 413 is used to perform grouting to form a first grouting layer 42 at the bottom of an underdrain above the tunnel, wherein the first grouting layer 42 serves as a first line of defense for preventing water seepage of the underdrain 6, thereby effectively protecting the tunnel; meanwhile, a second grouting layer 43 is formed at the top of the tunnel, and after the water seepage of the underdrain 5 passes through the first grouting layer 42, the water seepage can be further prevented from entering the tunnel by the second grouting layer 43, so that the stability of the tunnel is improved.
Further, as shown in fig. 1, the system also comprises a bentonite tank 14 which is arranged on the first pipeline 13 and fixed on the tunnel, and a stirring paddle which is arranged on the bentonite tank 14; the bentonite slurry in the bentonite tank 14 is stirred by rotating the stirring paddle so that the bentonite slurry is maintained in a homogenous state.
Further, as shown in fig. 1 and 2, the shield machine is provided with a screw conveyor to convey the muck in the soil chamber of the shield machine outwards; this sediment improvement system still includes that one end is linked together with first pipeline 13 and the other end communicates to the first branch pipe 131 of screw conveyer's exit, and the bentonite thick liquid transports the exit to screw conveyer through first branch pipe 131 to the moisture of the sediment of absorption screw conveyer transportation, thereby improve the plasticity of sediment.
Preferably, one end of the first branch pipe 131 is connected to the bentonite tank 14, and the other end is connected to the outlet of the screw conveyor.
Further, as shown in fig. 1, fig. 2 and fig. 3, the tunnel further includes a second branch pipe 132, one end of which is communicated with the first pipeline 13, and the other end of which is communicated to the cutter head of the shield tunneling machine, and the bentonite slurry is transported to the cutter head of the shield tunneling machine through the second branch pipe 132 and then enters the excavation surface of the tunnel to adsorb moisture of the excavation surface, so as to improve plasticity of soil quality of the excavation surface.
Preferably, one end of the second branch pipe 131 is connected to the bentonite tank 14, and the other end is connected to a cutter head of the shield tunneling machine.
Further, as shown in fig. 1 and 2, a soil bin is formed at a part of the shield tunneling machine close to the cutterhead to contain the residue soil excavated by the cutterhead; a third branch pipe 133, one end of which is communicated with the first pipeline 13 and the other end of which is communicated with the soil bin inlet; the bentonite slurry is transported to the inlet of the soil bin through the third branch pipe 133 to adsorb moisture of the muck to be introduced into the soil bin, thereby improving the plasticity of the muck.
Preferably, as shown in fig. 1, four third branches 133 are provided, one of which is connected to the bentonite tank 14 and the other is connected to the cutter head of the shield tunneling machine, and the other three of which are connected to the first pipeline adjacent to the pipeline on the D-D section of the shield tunneling machine and the other is connected to the cutter head of the shield tunneling machine, in such a way that the third branch 133 from the first pipeline is prevented from being too many, thereby affecting the flow rate of bentonite, so that the moisture in the soil can be completely adsorbed, and affecting the shield construction.
Further, as shown in fig. 1 and 2, the device further comprises a foaming agent barrel 15 which is arranged in the tunnel and contains foaming agent, and a foaming pipe of which one end is communicated with the foaming agent barrel 15 and the other end is communicated with the first pipeline 13; the foaming agent in the foaming agent tank 15 is delivered to the first pipe 13 through the foaming pipe to be mixed with the bentonite slurry in the first pipe 13, thereby improving the lubricity of the bentonite slurry.
Specifically, the specific gravity of the bentonite is 1.05-1.08, and the consistency is 30-40 s.
Preferably, the bentonite slurry is added into the excavation surface of the shield construction and the weak part of the shield machine system in an all-around manner, so that the stability of the shield construction is improved, the problem that the residual soil has more water content and breaks down in the shield construction is prevented, the construction period is shortened, and the construction efficiency is improved.
The concrete implementation case of the muck improvement system used in shield construction of the invention is as follows: a plurality of sleeve valve pipes 41 extend from the ground to the soil body of the tunnel to be tunneled, and grouting materials are conveyed to the tunnel to be formed through the sleeve valve pipes 41 to form a grouting layer, so that the muck environment at the position is improved;
arranging a bentonite pool 11 in an initial well of the shield machine, communicating one end of a first pipeline 13 with the bentonite pool 11, communicating the other end of the first pipeline 13 to a cutter head of the shield machine, arranging a centrifugal pump 13 in the first pipeline 13, and conveying bentonite slurry to the cutter head of the shield machine through the first pipeline 13 and entering an excavation surface of the tunnel to adsorb moisture of the excavation surface so as to improve slag; one end of the first branch pipe 131 is communicated with the first pipeline 13, the other end of the first branch pipe is communicated to an outlet of the screw conveyor, and the bentonite slurry is conveyed to the outlet of the screw conveyor through the first branch pipe 131 to adsorb moisture of the residue soil conveyed by the screw conveyor, so that the plasticity of the residue soil is improved; one end of the second branch pipe 132 is communicated with the first pipeline 13, the other end of the second branch pipe is communicated to a cutter head of the shield tunneling machine, and bentonite slurry is conveyed to the cutter head of the shield tunneling machine through the second branch pipe 132 and then enters the excavation surface of the tunnel to adsorb moisture of the excavation surface, so that the plasticity of soil quality of the excavation surface is improved; one end of the third branch pipe 133 is communicated with the first pipeline 13, and the other end is communicated to an inlet of the soil bin, and the bentonite slurry is transported to the inlet of the soil bin through the third branch pipe 133 to adsorb moisture of the muck to be fed into the soil bin, so that the plasticity of the muck is improved;
installing a mud effect restraining container 21 at a trolley of a shield machine, communicating one end of a second pipeline 22 with the mud effect restraining container 21 and communicating the other end of the second pipeline to a radial hole, installing a mud effect restraining pump at the second pipeline 22, and opening the mud effect restraining pump to convey mud effect restraining slurry to a soil body of a tunnel close to a pipe piece through the second pipeline 22 so as to adsorb water of the soil body and improve the plasticity of the soil body;
installing a water glass pump 31 at a sixth trolley of the shield tunneling machine, communicating one end of a third pipeline 32 with the water glass container 31 and communicating the other end of the third pipeline to a cutter head of the shield tunneling machine, installing the water glass pump at a third pipeline 22, turning on the water glass pump to convey water glass slurry to the cutter head of the shield tunneling machine through the third pipeline 32 and enter an excavation surface of the tunnel to adsorb moisture of the excavation surface, and thus improving the plasticity of soil quality of the excavation surface;
installing a foaming agent barrel 15 at a space of the shield tunneling machine close to the D-D section, communicating one end of a foaming pipe with the foaming agent barrel 15 and communicating the other end of the foaming pipe with the first pipeline 13 close to the D-D section, conveying a foaming agent in the foaming agent barrel 15 to the first pipeline 13 through the foaming pipe to mix with the bentonite slurry in the first pipeline 13, thereby improving the lubricity of the bentonite slurry and facilitating smooth transportation and output of the bentonite slurry to the first pipeline 13;
after the tunnel 5 is formed, grout is again supplied through the sleeve valve 41 to form a first grout layer 42 at the bottom of the underdrain 6 and a second grout layer 43 at the top of the tunnel 5, thereby improving the stability of the tunnel.
A construction method of a muck improving system used in shield construction comprises the following steps: arranging a bentonite pool 11 in an initial well of the shield machine, communicating one end of a first pipeline 13 with the bentonite pool 11, communicating the other end of the first pipeline 13 to a cutter head of the shield machine, and arranging a centrifugal pump 12 in the first pipeline 13; and (3) starting the centrifugal pump 12, conveying the bentonite slurry to a cutter head of the shield tunneling machine through a first pipeline 13, and enabling the bentonite slurry to enter the excavation surface of the tunnel so as to adsorb moisture on the excavation surface, thereby improving the plasticity of soil quality of the excavation surface.
Further, the construction method of the muck improving system for shield construction further comprises the following steps: arranging a mud effect restraining container 21 containing mud effect restraining slurry in the tunnel, communicating one end of a second pipeline 22 with the mud effect restraining container 21, communicating the other end of the second pipeline to a radial hole, and arranging a mud effect restraining pump in the second pipeline 22; and starting the mud effect prevention pump, and conveying the mud effect prevention slurry into soil on the outer side of the pipe piece through the second pipeline 22 to adsorb water in the soil, so that the plasticity of the soil is improved.
The concrete implementation case of the muck improvement system used in shield construction of the invention is as follows: a plurality of sleeve valve pipes 41 extend from the ground to the soil body of the tunnel to be tunneled, and grouting materials are conveyed to the tunnel to be formed through the sleeve valve pipes 41 to form a grouting layer, so that the muck environment at the position is improved;
arranging a bentonite pool 11 in an initial well of the shield machine, communicating one end of a first pipeline 13 with the bentonite pool 11, communicating the other end of the first pipeline 13 to a cutter head of the shield machine, arranging a centrifugal pump 13 in the first pipeline 13, and conveying bentonite slurry to the cutter head of the shield machine through the first pipeline 13 and entering an excavation surface of the tunnel to adsorb moisture of the excavation surface so as to improve slag; one end of the first branch pipe 131 is communicated with the first pipeline 13, the other end of the first branch pipe is communicated to an outlet of the screw conveyor, and the bentonite slurry is conveyed to the outlet of the screw conveyor through the first branch pipe 131 to adsorb moisture of the residue soil conveyed by the screw conveyor, so that the plasticity of the residue soil is improved; one end of the second branch pipe 132 is communicated with the first pipeline 13, the other end of the second branch pipe is communicated to a cutter head of the shield tunneling machine, and bentonite slurry is conveyed to the cutter head of the shield tunneling machine through the second branch pipe 132 and then enters the excavation surface of the tunnel to adsorb moisture of the excavation surface, so that the plasticity of soil quality of the excavation surface is improved; one end of the third branch pipe 133 is communicated with the first pipeline 13, and the other end is communicated to the inlet of the soil bin, and the bentonite slurry is transported to the inlet of the soil bin through the third branch pipe 133 to adsorb moisture of the muck to be entered into the soil bin, so that the plasticity of the muck is improved;
installing a mud effect restraining container 21 at a trolley of a shield machine, communicating one end of a second pipeline 22 with the mud effect restraining container 21 and communicating the other end of the second pipeline to a radial hole, installing a mud effect restraining pump at the second pipeline 22, and opening the mud effect restraining pump to convey mud effect restraining slurry to a soil body of a tunnel close to a pipe piece through the second pipeline 22 so as to adsorb water of the soil body and improve the plasticity of the soil body;
installing a water glass pump 31 at a sixth trolley of the shield machine, communicating one end of a third pipeline 32 with the water glass container 31 and communicating the other end of the third pipeline to a cutter head of the shield machine, installing the water glass pump at the third pipeline 22, opening the water glass pump to convey water glass slurry to the cutter head of the shield machine through the third pipeline 32 and enter an excavation surface of the tunnel so as to adsorb moisture of the excavation surface, and thus improving the plasticity of soil quality of the excavation surface;
installing a foaming agent barrel 15 in a space of a shield machine close to a D-D section, communicating one end of a foaming pipe with the foaming agent barrel 15 and communicating the other end of the foaming pipe with a first pipeline 13 close to the D-D section, conveying a foaming agent in the foaming agent barrel 15 to the first pipeline 13 through the foaming pipe to mix with bentonite slurry in the first pipeline 13, thereby improving the lubricity of the bentonite slurry and facilitating the smooth transportation and output of the bentonite slurry to the first pipeline 13;
and after the tunnel 5 is formed by laying the pipe pieces in the tunnel, grouting materials are conveyed again through the sleeve valve pipe 41, a first grouting layer 42 is formed at the bottom of the underdrain 6, and a second grouting layer 43 is formed at the top of the tunnel 5, so that the stability of the tunnel is improved.
The muck improving system for the water-rich stratum is arranged outside the muck improving system of the shield machine, so that the muck improving system of the shield machine and the muck improving system of the shield machine work together in shield construction, and the improving system improves the stratum around the tunnel in an all-around way, so that when the shield is driven, the influence on ground traffic and social environment is reduced, zero settlement of the stratum and surrounding buildings is ensured, safety accidents are avoided, meanwhile, the improving system directly protects the weak part of the shield machine, the shield machine is prevented from being damaged, and the safety risk of tunnel construction is avoided.
While the invention has been described in detail and with reference to the drawings and examples thereof, it will be apparent to one skilled in the art that various changes in form and detail can be made therein. Therefore, certain details of the embodiments should not be construed as limitations of the invention, except insofar as the following claims are interpreted to cover the invention.
Claims (8)
1. A muck reclamation system for use in shield construction, a shield machine driving a soil mass to be constructed from an originating well to form a tunnel, the muck reclamation system comprising:
the bentonite pond is arranged in the originating well, and bentonite slurry is added into the bentonite pond;
one end of the first pipeline is communicated with the bentonite pool, the other end of the first pipeline is communicated with a cutter head of the shield tunneling machine, the bentonite slurry is conveyed to the cutter head of the shield tunneling machine through the first pipeline and enters an excavation surface of the tunnel to adsorb moisture of the excavation surface, and therefore plasticity of soil quality of the excavation surface is improved; and
a centrifugal pump mounted to the first pipe;
the shield machine is provided with a screw conveyor to convey the muck in the soil bin of the shield machine outwards;
one end of the first branch pipe is communicated with the first pipeline, the other end of the first branch pipe is communicated to the outlet of the spiral conveyor, and the bentonite slurry is conveyed to the outlet of the spiral conveyor through the first branch pipe so as to adsorb moisture of the muck conveyed by the spiral conveyor, so that the plasticity of the muck is improved;
the sleeve valve pipes extend from the ground to the tunnel to be constructed, a plurality of through holes are formed in pipe bodies of the sleeve valve pipes at intervals, and grouting is performed on the top of the tunnel through the sleeve valve pipes so as to form a grouting layer on the top of the tunnel;
a plurality of sleeve valve pipe sets up along the extending direction in tunnel, just the through-hole divide into first slip casting mouth, second slip casting mouth and third slip casting mouth in proper order, just sleeve valve pipe sets up to the top direction slope in tunnel, through first slip casting mouth with the second slip casting mouth is in order to the tunnel department slip casting to treating the construction to the stratum of the tunnel part of treating the construction is treated in the improvement, and the tunnel forms the back, through the third slip casting mouth in order to the top slip casting of tunnel, thereby in the top of tunnel forms first slip casting layer.
2. The muck improving system for shield construction according to claim 1, wherein a plurality of segments are attached to the side wall of the excavated tunnel, and the segments are provided with radial holes;
the residue soil improvement system further comprises a mud effect-restraining container, a second pipeline and a mud effect-restraining pump, wherein the mud effect-restraining container is arranged in the tunnel and contains mud effect-restraining slurry, one end of the second pipeline is communicated with the mud effect-restraining container, the other end of the second pipeline is communicated to the radial hole, the mud effect-restraining pump is installed on the second pipeline, the mud effect-restraining slurry is conveyed to the soil body on the outer side of the pipe piece through the second pipeline to absorb water in the soil body, and therefore plasticity of the soil body is improved.
3. The muck improving system for shield construction according to claim 1, further comprising a water glass container disposed in the tunnel and containing water glass slurry, a third pipeline having one end communicated with the water glass container and the other end communicated with a cutter head of the shield machine, and a water glass pump mounted on the third pipeline;
and the water glass slurry of the water glass container is conveyed to a cutter head of the shield tunneling machine through the third pipeline and enters the excavation surface of the tunnel to adsorb the moisture of the excavation surface, so that the plasticity of the soil of the excavation surface is improved.
4. The muck improvement system for shield construction according to claim 1, further comprising a plurality of second branch pipes, one end of each second branch pipe is communicated with the first pipeline, the other end of each second branch pipe is communicated with the cutter head of the shield tunneling machine, and the bentonite slurry is transported to the cutter head of the shield tunneling machine through the second branch pipes and enters the excavation surface of the tunnel to adsorb moisture on the excavation surface, so that the plasticity of soil quality of the excavation surface is improved.
5. The muck reclamation system as recited in claim 1, wherein a portion of the shield tunneling machine adjacent to the cutterhead is formed with a soil chamber for receiving muck excavated by the cutterhead;
the muck improvement system further comprises a third branch pipe, one end of the third branch pipe is communicated with the first pipeline, the other end of the third branch pipe is communicated with the soil bin inlet, and the bentonite slurry is conveyed to the soil bin inlet through the third branch pipe to adsorb moisture of muck to enter the soil bin, so that the plasticity of the muck is improved.
6. The muck improving system for shield construction according to claim 5, further comprising a foaming agent barrel disposed in the tunnel and containing a foaming agent, a foaming pipe having one end communicated with the foaming agent barrel and the other end communicated with the first pipeline;
the foaming agent in the foaming agent barrel is conveyed to the first pipeline through the foaming pipe to be mixed with the bentonite slurry in the first pipeline.
7. A construction method of the muck reclamation system used in shield construction according to claim 1, comprising the steps of:
arranging a bentonite pool in an initial well of the shield machine, communicating one end of the first pipeline with the bentonite pool, communicating the other end of the first pipeline with a cutter head of the shield machine, and arranging the centrifugal pump in the first pipeline;
and opening the centrifugal pump, and conveying bentonite slurry to a cutter head of the shield tunneling machine through the first pipeline and entering an excavation surface of the tunnel to adsorb moisture of the excavation surface, so that the plasticity of soil quality of the excavation surface is improved.
8. The construction method of the muck upgrading system used in shield construction according to claim 2, further comprising a mud effect container disposed in the tunnel and containing mud effect slurry, a second pipeline having one end communicated with the mud effect container and the other end communicated to the radial hole, and a mud effect pump mounted on the second pipeline;
and starting the mud effect-restraining pump, and conveying the mud effect-restraining slurry into soil bodies on the outer sides of the pipe pieces through the second pipeline to absorb moisture in the soil bodies, so that the plasticity of the soil bodies is improved.
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| CN202110337944.8A CN113153321B (en) | 2021-03-30 | 2021-03-30 | Muck improvement system for shield construction and construction method thereof |
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| CN202110337944.8A CN113153321B (en) | 2021-03-30 | 2021-03-30 | Muck improvement system for shield construction and construction method thereof |
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| CN113153321B true CN113153321B (en) | 2023-03-14 |
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| CN114086980A (en) * | 2021-12-03 | 2022-02-25 | 北京市市政四建设工程有限责任公司 | Shield starting stage muck transportation system and method |
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