阅读说明：本技术 一种针对运营地铁隧道位移纠偏的充气囊结构及施工方法 (Inflatable bag structure for deviation correction of displacement of operation subway tunnel and construction method ) 是由 魏纲 齐永洁 于 2020-06-15 设计创作，主要内容包括：本发明公开了一种针对运营地铁隧道位移纠偏的充气囊结构及施工方法,包括充气囊,所述充气囊内部设置有中心拉杆和围绕所述中心拉杆布置的伸缩骨架,顶部设置与所述中心拉杆固定连接的锥形帽尖,底部连接密封塞,所述密封塞中心留有供中心拉杆、充气管以及送土管伸入的孔道,所述充气管由充气装置供气,所述送土管由送土装置供填充土。利用充气囊进行充气挤压纠偏的方式能够最大限度上将对周围的影响降低到最小,避免了传统袖阀管注浆中对周围环境影响大,可能造成临近其他管线或构筑物不必要变形的危害,适用于在管线密集的地下空间进行局部的隧道位移纠偏。(The invention discloses an inflatable bag structure for deviation rectification of an operation subway tunnel and a construction method thereof. The mode of utilizing the inflatable bag to inflate extrusion and rectifying deviation can reduce the influence on the periphery to the minimum to the utmost extent, avoids the harm that the influence on the surrounding environment is large in the traditional sleeve valve pipe grouting and unnecessary deformation of other pipelines or structures is possibly caused, and is suitable for local tunnel displacement rectification in the underground space with dense pipelines.)

1. The utility model provides an air bag structure to operation subway tunnel displacement is rectified, a serial communication port, including the air bag, the inside center pull rod that is provided with of air bag and center on the flexible skeleton that the center pull rod was arranged, the top set up with center pull rod fixed connection's toper cap point, the sealing plug is connected to the bottom, the sealing plug center is left and is supplied center pull rod, gas tube and the pore that the soil feeding pipe stretched into, the gas tube is supplied the air by aerating device, the soil feeding pipe supplies the filling soil by the soil feeding device.

2. The inflatable bag structure for deviation rectification of the displacement of the operating subway tunnel according to claim 1, wherein a first speed-limiting control valve and a first flowmeter are connected to the inflatable pipe, and a second speed-limiting control valve and a second flowmeter are connected to the soil conveying pipe.

3. The inflatable bag structure for deviation rectification of an operation subway tunnel according to claim 1, wherein said inflating device adopts a first inflator pump.

4. The inflatable air bag structure for deviation rectification of an operation subway tunnel according to claim 1, wherein the soil conveying device comprises a second inflation pump and a soil collecting box, and the soil conveying pipe is respectively connected with the second inflation pump and the soil collecting box.

5. The inflatable bag structure for deviation rectification of the operating subway tunnel according to claim 1, wherein the telescopic frame is longitudinally arranged along the inner surface of the inflatable bag at equal angles, and the telescopic frame and the inflatable bag can be synchronously folded or unfolded.

6. The inflatable air bag structure for deviation rectification of an operating subway tunnel according to claim 1, wherein the telescopic framework is made of steel materials and is divided into a plurality of sections, the sections are connected through hinges, and the telescopic framework is in a folded state and an unfolded state.

7. The inflatable bag structure for correcting the displacement of the tunnel of the operation subway according to claim 1, wherein when the inflatable bag structure is used for a grouting hole on the upper half section of the tunnel, the distance between the front port of the inflatable tube and the front port of the soil conveying tube is 5-8cm from the conical cap tip, the front port of the inflatable tube is arranged above, the front port of the soil conveying tube is arranged below, and the upper part and the lower part of the inflatable tube are staggered;

when the grouting device is used for a grouting hole in the lower half section of a tunnel, the front end opening of the inflation tube and the front end opening of the soil conveying tube are inserted into the inflation bag and are 5-8cm away from the sealing plug, the front end opening of the inflation tube is arranged above, and the front end opening of the soil conveying tube is arranged below and staggered with each other.

8. The inflatable bag structure for deviation rectification of the displacement of the operating subway tunnel according to claim 1, wherein a three-layer anti-suck-back device is arranged at a front port of the inflatable tube, and the three-layer anti-suck-back device comprises a wire mesh, a filter cloth and a wire mesh in sequence from top to bottom.

9. The inflatable bag structure for deviation rectification of the displacement of the operating subway tunnel according to claim 1, wherein the inflatable bags are arranged in the displacement section of the tunnel according to the principle that the middle is dense and the two ends are sparse, two inflatable bags are arranged on the same ring of tunnel segment and are respectively arranged on the left side and the right side of the tunnel segment, the included angle between the position of the left inflatable bag and the vertical direction is α, and the inflation quantity is V_αThe included angle between the position of the right inflatable bag and the vertical direction is β, and the inflation quantity is V_βThe inflation amount and the included angle satisfy

10. The construction method of the air bag structure for correcting the displacement of the operating subway tunnel according to claim 2, comprising the following steps:

1) designing a measuring and arranging scheme: measuring the length and the deformation of a deformation interval section of the tunnel, identifying available grouting holes in the interval range, measuring the angles between the grouting holes on the left side and the right side of the same ring of the tunnel and the vertical direction as alpha and beta respectively, and determining the arrangement number, the arrangement interval and the arrangement range of the inflatable bags through calculation and analysis;

2) manufacturing the inflatable bag: sleeving an anti-suck-back device on the port of the inflation tube, enabling the inflation tube and the soil conveying tube to penetrate through a small hole in the sealing plug and be inserted into the inflation bag, selecting a proper insertion depth according to the use position of the inflation bag, and smearing waterproof paint on the inner hole passage and the side surface of the sealing plug after the assembly is finished;

3) inserting an inflatable bag: pushing the folded inflatable bags into the grouting hole, after the inflatable bags are inserted into the wall and the soft soil layer is in a specified depth, embedding and fixing the sealing plug in the grouting hole, coating slurry on the inner surface of the sealing plug to perform waterproof treatment, and continuously repeating the operation until all the inflatable bags are driven into the specified grouting hole;

4) and (3) inflation deviation rectifying process: opening an inflating device and a first speed-limiting control valve and closing a second speed-limiting control valve to start inflating by using a corresponding inflation tube on each inflation bag in cooperation with a real-time tunnel monitoring technology, wherein the inflation quantity and the inflation speed of each inflation bag need to be strictly noticed and the inflation quantities of two annular inflation bags are determined according to the inflation quantities of the two annular inflation bags when the first speed-limiting control valve and the first flowmeter are fully utilized in the inflation process

5) and (3) deformation recovery of the tunnel: after the deviation rectification of the tunnel is finished, firstly closing the first speed-limiting control valve and the inflation device of each inflation bag, stabilizing for a period of time, and waiting for the longitudinal deformation recovery of the tunnel;

6) and (3) soil body replacement and filling process: after the longitudinal deformation of the tunnel is recovered, firstly, starting a soil conveying device, sucking filling soil into a soil conveying pipe through high-pressure gas, then synchronously and slowly starting a second speed-limiting control valve and a first speed-limiting control valve, closely observing the readings of a second flowmeter and a first flowmeter, strictly controlling the volume of the gas fed into the soil conveying pipe to be equal to the volume of the gas discharged from an inflation pipe, maintaining the size of the inflation bag unchanged, gradually accumulating the filling soil in the inflation bag until the whole inflation bag is finally filled with the filling soil along with the process of air exchange, then injecting light quick-setting cement mortar into the inflation bag by using the soil conveying pipe, further compressing and solidifying the filling soil in the inflation bag, and in the process of soil exchange and filling, locking a central pull rod to keep the shape of the inflation bag unchanged;

7) and (4) subsequent related work: after the structure of the inflatable bag is stable, the soil conveying device, the first speed-limiting control valve and the second speed-limiting control valve are closed, after the later-stage tunnel displacement monitoring result meets the stability requirement, the relevant structural equipment inside the duct piece is gradually removed, the sealing plug is pulled out, special sealing treatment is carried out on the grouting hole, and the deviation rectifying work is completed.

Technical Field

The invention belongs to the technical field of reinforcement and protection of an operation subway tunnel, and particularly relates to an inflatable bag structure for deviation correction of the displacement of the operation subway tunnel and a construction method.

Background

With the development of urban underground spaces, more and more pipelines and structures appear in limited shallow stratum spaces. Because the subway tunnel is sensitive to the influence of displacement, the construction influences such as construction near a newly-built tunnel possibly appearing in the existing operation subway tunnel, foundation pit excavation, large-scale pile foundation construction, large-scale ground pile loading and the like can cause local displacement deformation of the existing tunnel towards all directions, and the normal operation and the structure safety of the tunnel are influenced.

In response to excessive tunnel displacement, grouting deviation rectification is often adopted in engineering to rectify deviation. The traditional grouting deviation rectifying technology is usually used for compacting and grouting through arranging sleeve valve pipes, the vertical sleeve valve pipes can be arranged for grouting to conduct horizontal deviation rectifying of a tunnel, and the oblique sleeve valve pipes can be arranged for vertical deviation rectifying. However, in practical engineering, slurry is easy to cause slurry channeling in soil, the volume, position and direction of injected slurry are difficult to control accurately, and secondary influence is easy to be caused on other surrounding structures. When a to-be-corrected body and a non-corrected body exist in a narrow space at the same time or the deviation correction amount of a plurality of to-be-corrected bodies is not uniform, the difficulty of the traditional sleeve valve pipe deviation correction scheme in sleeve valve pipe driving arrangement, grouting amount and grouting pressure control can be increased sharply, and the traditional sleeve valve pipe deviation correction scheme is difficult to realize in reality. Meanwhile, the deviation rectifying form of sleeve valve pipe grouting is not flexible enough, the grouting process is irreversible, if too much grout is injected, the deviation rectifying process is easy to be excessive, reverse grouting is needed in the other direction, unnecessary waste is caused, and time and labor are wasted. Except the sleeve valve pipe slip casting deviation rectifying technology, another common deviation rectifying measure aiming at an operation tunnel in engineering is duct piece wall post-grouting, the existing wall post-grouting technology mostly directly carries out high-pressure slip casting to the outside of a duct piece through a slip casting hole, the surrounding soil layer is reinforced by the splitting and the osmosis of grout, the method can correct the floating or sinking deformation of the tunnel in a short period, but because the specific gravity of a cement block formed by the solidification of general grout and a soil body is larger than surrounding soft soil, the cement block can drive the tunnel to sink with acceleration in the later operation process, and the operation and the structure safety of the tunnel are influenced. In addition, a large amount of slurry is required to be injected in both the sleeve valve pipe technology and the wall back grouting technology, so that the soil body and an underground water source are polluted greatly, and the environment is not protected.

In summary, the existing grouting deviation rectifying technology for the shield tunnel mainly has the problems that the deviation rectifying effect is difficult to control accurately, the influence on other non-rectifying bodies is large, the deviation rectifying form is inflexible, the design of the construction scheme is complex, the environment is polluted, the sedimentation is easy to accelerate after construction, and the like, and the improvement technology is urgently needed to solve.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an inflatable bag structure for deviation correction of the displacement of an operation subway tunnel and a construction method.

In order to achieve the technical purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the invention provides an inflatable bag structure for deviation rectification of an operating subway tunnel, which comprises an inflatable bag, wherein a central pull rod and a telescopic framework arranged around the central pull rod are arranged in the inflatable bag, a conical cap tip fixedly connected with the central pull rod is arranged at the top of the inflatable bag, a sealing plug is connected at the bottom of the inflatable bag, a pore passage for the central pull rod, an inflation pipe and a soil conveying pipe to extend into is reserved in the center of the sealing plug, the inflation pipe is supplied with air by an inflation device, and the soil conveying pipe is supplied with filling soil by a soil conveying device.

Furthermore, a first speed-limiting control valve and a first flowmeter are connected to the inflation pipe, and a second speed-limiting control valve and a second flowmeter are connected to the soil conveying pipe.

Further, the inflation device adopts a first inflation pump.

Furthermore, the soil conveying device comprises a second air pump and a soil collecting box, and the soil conveying pipe is respectively connected with the second air pump and the soil collecting box.

Furthermore, the telescopic framework is longitudinally arranged at equal angles along the inner surface of the inflatable bag, and the telescopic framework and the inflatable bag can be synchronously folded or unfolded.

Furthermore, the telescopic framework is made of steel materials and is divided into a plurality of sections, the sections are connected through hinges, and the telescopic framework is in a furled state and an unfolded state.

Further, when the grouting hole is used for the upper half-section grouting hole of the tunnel, the distance between the front port of the inflation tube and the front port of the soil conveying tube is 5-8cm from the conical cap tip, the front port of the inflation tube is arranged above, the front port of the soil conveying tube is arranged below, and the inflation tube and the soil conveying tube are staggered up and down;

when the grouting device is used for a grouting hole in the lower half section of a tunnel, the front end opening of the inflation tube and the front end opening of the soil conveying tube are inserted into the inflation bag and are 5-8cm away from the sealing plug, the front end opening of the inflation tube is arranged above, and the front end opening of the soil conveying tube is arranged below and staggered with each other.

Furthermore, the front end opening of the inflation tube is provided with a three-layer anti-suck-back device, and the three-layer anti-suck-back device is composed of a wire mesh, filter cloth and the wire mesh from top to bottom in sequence.

Furthermore, the inflatable bags are arranged in the displacement section of the tunnel according to the principle that the middle is dense and the two ends are sparse, two inflatable bags are arranged on the same ring of tunnel segment and are respectively arranged on the left side and the right side of the tunnel segment, the included angle between the position of the left inflatable bag and the vertical direction is α, and the inflation amount is V_αThe included angle between the position of the right inflatable bag and the vertical direction is β, and the inflation quantity is V_βThe inflation amount and the included angle satisfyThe concrete air inflation amount is adjusted and determined according to the deviation rectifying displacement amount of the tunnel.

In a second aspect, an embodiment of the present invention further provides a construction method for a displacement correction air bag structure of an operation subway tunnel, including the following steps:

1) designing a measuring and arranging scheme: measuring the length and the deformation of a deformation interval section of the tunnel, identifying available grouting holes in the interval range, measuring the angles between the grouting holes on the left side and the right side of the same ring of the tunnel and the vertical direction as alpha and beta respectively, and determining the arrangement number, the arrangement interval and the arrangement range of the inflatable bags through calculation and analysis;

2) manufacturing the inflatable bag: sleeving an anti-suck-back device on the port of the inflation tube, enabling the inflation tube and the soil conveying tube to penetrate through a small hole in the sealing plug and be inserted into the inflation bag, selecting a proper insertion depth according to the use position of the inflation bag, and smearing waterproof paint on the inner hole passage and the side surface of the sealing plug after the assembly is finished;

3) inserting an inflatable bag: pushing the folded inflatable bags into the grouting hole, after the inflatable bags are inserted into the wall and the soft soil layer is in a specified depth, embedding and fixing the sealing plug in the grouting hole, coating slurry on the inner surface of the sealing plug to perform waterproof treatment, and continuously repeating the operation until all the inflatable bags are driven into the specified grouting hole;

4) and (3) inflation deviation rectifying process: the inflation device and the first speed limit control are opened in cooperation with the real-time tunnel monitoring technologyControlling a valve, closing the second speed-limiting control valve, and beginning to inflate by using the corresponding inflation tube on each inflation bag, wherein the inflation quantity and the inflation speed of each inflation bag need to be strictly paid attention to by fully using the first speed-limiting control valve and the first flowmeter in the inflation process, and the inflation quantity of the two annular inflation bags is according to the inflation quantity of the two annular inflation bags

The ratio of the deformation interval to the expansion interval is limited, the inflation process is carried out synchronously, firstly, the inflatable bags close to the center of the deformation interval are inflated and corrected along the longitudinal direction of the tunnel, then, the two sides are inflated symmetrically step by step, and in the inflation and expansion process of each inflatable bag, the internal telescopic frameworks are opened step by step;

5) and (3) deformation recovery of the tunnel: after the deviation rectification of the tunnel is finished, firstly closing the first speed-limiting control valve and the inflation device of each inflation bag, stabilizing for a period of time, and waiting for the longitudinal deformation recovery of the tunnel;

6) and (3) soil body replacement and filling process: after the longitudinal deformation of the tunnel is recovered, firstly, starting a soil conveying device, sucking filling soil into a soil conveying pipe through high-pressure gas, then synchronously and slowly starting a second speed-limiting control valve and a first speed-limiting control valve, closely observing the readings of a second flowmeter and a first flowmeter, strictly controlling the volume of the gas fed into the soil conveying pipe to be equal to the volume of the gas discharged from an inflation pipe, maintaining the size of the inflation bag unchanged, gradually accumulating the filling soil in the inflation bag until the whole inflation bag is finally filled with the filling soil along with the process of air exchange, then injecting light quick-setting cement mortar into the inflation bag by using the soil conveying pipe, further compressing and solidifying the filling soil in the inflation bag, and in the process of soil exchange and filling, locking a central pull rod to keep the shape of the inflation bag unchanged;

7) and (4) subsequent related work: after the structure of the inflatable bag is stable, the soil conveying device, the first speed-limiting control valve and the second speed-limiting control valve are closed, after the later-stage tunnel displacement monitoring result meets the stability requirement, the relevant structural equipment inside the duct piece is gradually removed, the sealing plug is pulled out, special sealing treatment is carried out on the grouting hole, and the deviation rectifying work is completed.

According to the technical scheme, the method has the following technical effects:

1) can correct the deviation in the dense space of the pipeline

The mode of utilizing the inflatable bag to inflate extrusion and rectifying deviation can reduce the influence on the periphery to the minimum to the utmost extent, avoids the harm that the influence on the surrounding environment is large in the traditional sleeve valve pipe grouting and unnecessary deformation of other pipelines or structures is possibly caused, and is suitable for local tunnel displacement rectification in the underground space with dense pipelines.

2) The deviation rectification form is more flexible

Because traditional slip casting deviation rectifying process is irreversible, if the thick liquid volume of pouring into too big then can lead to rectifying an excessive amount, need carry out reverse slip casting in another direction, cause unnecessary waste, waste time and energy, and utilize the gas cell to rectify a deviation, because the setting of flowmeter and speed limit control valve, the gas quantity of can accurate control pouring into, when filling gas too much, can open the speed limit control valve on the soil conveying pipe and carry out the pressure release, avoid rectifying an excessive amount.

3) Can correct tunnel displacement in all directions

Because each ring segment all sets up the slip casting hole of different angles, can select different slip casting holes to carry out the arrangement of gas cell according to tunnel displacement section and displacement direction. For example, when the tunnel sinks and deforms, the inflatable bag can be arranged on the lower half part of the segment ring, when the inflatable bag driven into the soil layer starts to inflate and expand, the lower soil body can be extruded, and due to the mutual action of the forces, the lower soil body can generate an upward reaction force for rectifying the deviation of the tunnel at the sinking section back to the original position in an extruding mode; if the tunnel is locally deformed in an upward floating manner, the upper half part of the segment ring can be provided with an inflatable bag.

4) Can accurately correct the local displacement deformation of the tunnel

According to the range and the displacement value of the displacement section of the tunnel, the inflatable bags with different quantities and sizes can be arranged along the circumferential direction and the longitudinal direction of the tunnel for correcting the deviation, the longitudinal arrangement principle is based on the middle point of the displacement section, the two sides are symmetrically arranged, and the scheme of dense center and sparse two sides is followed, in addition, the segments are spliced by staggered joints, the positions of grouting holes of each ring of the tunnel are possibly different, so that the size and the quantity of inflated air of each inflatable bag in the circumferential direction are possibly different, the deviation correcting target is met, the tunnel is ensured not to generate displacement in other directions, namely, the inflated air quantity in the two inflatable bags on the same ring needs to be calculated to determine a proportion. In actual engineering, a real-time displacement monitoring technology is required to be adopted for assistance, and the deviation rectifying amount is accurately controlled.

5) Simple operation, fast rectification and avoiding the waste of slurry

The construction method is simple and quick, is convenient to adopt in the operated tunnel, reduces the waste of slurry due to the fact that the soil body filled with the inflatable bag is replaced, and simultaneously avoids the defect that the slurry is diffused in the soil to pollute the environment in the traditional sleeve valve pipe grouting deviation correction.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of an airbag structure for deviation correction of a displacement of an operating subway tunnel according to an embodiment of the present invention;

FIG. 2 is a schematic view of the process of driving the air bag into the ground in the embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a deviation correcting process of the inflation of the inflatable bag according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a balloon soil displacement process in an embodiment of the invention;

FIG. 5 is a view showing the arrangement of the air cells in the longitudinal direction when the tunnel is deformed by sinking in the embodiment of the present invention;

FIG. 6 is a view showing the lateral arrangement of the air bags in the case of the tunnel sinking and deforming in the embodiment of the present invention;

FIG. 7 is a detail view of the interior of the bladder during a tunnel collapse deformation in accordance with an embodiment of the present invention;

FIG. 8 is a longitudinal arrangement of the inflatable bags during floating deformation of the tunnel according to the embodiment of the invention;

FIG. 9 is a transverse arrangement diagram of the inflatable bags during floating deformation of the tunnel in the embodiment of the invention;

FIG. 10 is a detailed view of the interior of the balloon during ascent deformation of the tunnel according to an embodiment of the present invention;

description of reference numerals: a segment 1; a grouting hole 2; a sealing plug 3; an air-filled bag 4; a telescopic framework 5; a conical cap tip 6; a central pull rod 7; an inflation tube 8; a soil delivery pipe 9; a fill tube port 10; a soil feeding pipe port 11; a first speed-limiting control valve 12; a second rate-limiting control valve 13; a first flow meter 14; a second flow meter 15; a first inflator 16; a second inflator 17; a soil collection box 18; and filled with soil 19.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

As shown in fig. 1, this embodiment provides an airbag structure to operation subway tunnel displacement is rectified, including airbag 4, inside central pull rod 7 and the center of being provided with of airbag 4 centers on telescopic frame 5 that central pull rod 7 arranged, the top set up with central pull rod 7 fixed connection's toper cap point 6, sealing plug 3 is connected to the bottom, sealing plug 3 center leaves the pore that supplies central pull rod 7, gas tube 8 and send native pipe 9 to stretch into, gas tube 8 is by the aerating device air feed, send native pipe 9 to supply with filled soil 19 by the device of sending soil.

In this embodiment, the conical cap tip 6 is made of a hard metal material, so that the conical cap tip can be conveniently pushed in a grouting crust layer and a soil body.

In the embodiment, the bottom of the inflatable bag 4 is connected with the sealing plug 3 and fixed in the grouting hole 2 together, the inner surface of the inflatable bag 4 is tightly attached with the telescopic framework 5, the center of the inflatable bag 4 is provided with the central pull rod 7, the top of the central pull rod 7 is connected with the conical cap tip 6, and the bottom of the central pull rod passes through the sealing plug 3, so that the whole inflatable bag 4 and the telescopic framework 5 are supported.

In this embodiment, the gas-filled pipe 8 is connected to a first speed-limiting control valve 12 and a first flowmeter 14, and the soil-conveying pipe 9 is connected to a second speed-limiting control valve 13 and a second flowmeter 15, wherein the speed-limiting control valve can control the flow rate of gas, and the flowmeter can monitor the volume of gas flowing through the corresponding pipeline in real time. In this embodiment, the inflator is a first inflator 16. In this embodiment, the soil transporting device includes a second inflator 17 and a soil collecting box 18, and the soil transporting pipe 9 is connected to the second inflator 17 and the soil collecting box 18 respectively.

In this embodiment, telescopic frame 5 is along the vertical equiangular setting of 4 internal surfaces of gas-filled bags, and telescopic frame 5 and gas-filled bags 4 can draw in or open in step, telescopic frame 5 is made by the steel material of a plurality of sections, links to each other through articulated between the section, and telescopic frame 5 divide into draw in state and open state, can be through pulling central pull rod 7 downwards and turn into open state by the state of drawing together, because telescopic frame 5 and gas-filled bags 4 reciprocal anchorage, so telescopic frame 5 opens and will make gas-filled bags 4 open equally.

In the embodiment, when the grouting hole is used for the grouting hole 2 on the upper half section of the tunnel, the distance between the front port 10 of the inflation tube 8 and the front port 11 of the soil conveying tube 9 is 5-8cm from the conical cap tip, the front port 10 of the inflation tube is arranged above, the front port 11 of the soil conveying tube is arranged below, and the upper part and the lower part are mutually staggered;

when the grouting hole is used for the grouting hole 2 on the lower half section of the tunnel, the front port 10 of the inflation tube and the front port 11 of the soil conveying tube are inserted into the inflation bag 4 and are 5-8cm away from the sealing plug, the front port 10 of the inflation tube is arranged above, the front port 11 of the soil conveying tube is arranged below, and the upper part and the lower part are mutually staggered.

In this embodiment, the front port 10 of the inflation tube is provided with a three-layer anti-suck-back device, the three-layer anti-suck-back device is composed of a wire mesh, a filter cloth and a wire mesh from top to bottom in sequence, and in the subsequent soil replacement process, the filler soil 19 can be prevented from entering the inflation tube 8, so that the inflation tube 8 is ensured not to be blocked.

In this embodiment, the inflatable bags 4 are arranged in the displacement section of the tunnel according to the principle that the middle is dense and the two ends are sparse, the tunnel segment 1 in the same ring is provided with two inflatable bags 4, the two inflatable bags 4 are respectively arranged on the left side and the right side of the tunnel segment 1, the included angle between the position of the inflatable bag 4 on the left side and the vertical direction is α, and the inflation amount is V_αThe included angle between the position of the right inflatable bag 4 and the vertical direction is β, and the inflation quantity is V_βThe inflation amount and the included angle satisfyThe concrete air inflation amount is adjusted and determined according to the deviation rectifying displacement amount of the tunnel.

As shown in fig. 2, fig. 3 and fig. 4, the schematic diagrams of the structural construction of the present invention are shown at various stages, wherein fig. 2 is a process of driving the air bag 4 into the soil body, the conical cap tip 6 at the top of the air bag 4 is utilized, the whole air bag 4 is pushed into the soft soil layer after penetrating through the grouting hard shell layer by external force, the telescopic framework 5 is in a close state in the pushing process, and after the air bag is driven to a specified depth, the sealing plug 3 is embedded and fixed in the grouting hole 2; FIG. 3 is a process of deviation correction during inflation, according to the feedback of real-time monitoring technology, the inflatable bag 4 is inflated by the inflation tube 8, the inflatable bag 4 expands, and the central pull rod 7 is slowly pulled downwards according to the volume of the inflation gas, so that the telescopic frame 5 is gradually opened, during the process, the telescopic frame 5 plays a role in stabilizing and supporting the structure of the inflatable bag 4, so that the structure of the inflatable bag is not irregularly deformed during the inflation process, and the deviation correction quality is ensured; fig. 4 shows a process of soil replacement and filling, in which the filling soil 19 is fed into the air bag 4 by using high-pressure gas through the soil feeding pipe 9, the air tube 8 on the other side plays a role of discharging excess gas, the volume of the high-pressure gas filled in the soil feeding pipe 9 is ensured to be equal to the volume of the gas discharged from the air tube 8 through the control of the speed-limiting control valves on both sides and the flow meter, the volume balance of the gas in the air bag 4 is maintained, and in addition, because the anti-suck-back device is arranged at the port 10 of the air tube, the soil entering the air bag 4 cannot be discharged out of the air tube 8 along with the high-pressure gas and is permanently remained in the air bag 4 until the whole air bag 4 is filled.

As shown in fig. 5, 6 and 7, when the tunnel is deformed by sinking in the longitudinal direction, the inflatable bags 4 can be arranged in the longitudinal direction as shown in fig. 5, the inflatable bags 4 are arranged on the lower half part of the duct piece 1 and are arranged symmetrically along the center of the sinking deformation section, the arrangement number is dense in the middle and sparse at two ends, and in the process of inflation and rectification, the inflatable bags 4 in the middle are sequentially and symmetrically arranged towards two sides, specifically in the same directionThe sequence of a, b, c, d and e is sequentially inflated, as shown in fig. 6, the inflatable bags 4 are arranged along the circular direction of the duct piece 1, because a track bed is arranged at the bottom of the duct piece, the closest grouting holes 2 at two sides of the track bed can be selected for arranging the inflatable bags 4, the grouting holes 2 at two sides are often asymmetric, in order to ensure that the inflatable bags 4 do not generate additional horizontal deformation in the process of correcting the sinking deformation of the tunnel, an asymmetric inflation rectification scheme is needed, namely the inflation amount of the inflatable bags 4 at two sides is different, for a specific example, the included angle between the left inflatable bag 4 and the vertical direction is α, the included angle between the right inflatable bag 4 and the vertical direction is β, so that α is more than β, and in order to ensure that no additional horizontal deformation occurs, the radius R of the left inflatable bag 4 is₁Is smaller than the radius R of the right side airbag 4₂I.e. the inflation volume V of the left side airbag 4_αIs less than the inflation quantity V of the right side inflatable bag 4_βSpecifically satisfyAs shown in fig. 7, which is a detailed view of the inside of the air bag 4, since the air bag 4 is arranged at the lower half section of the duct piece 1, the air inflation tube port 10 and the soil feeding tube port 11 are inserted into the air bag 4 shallowly, the depth is only 5-8mm, and the two ports are staggered up and down, the air inflation tube port 10 is at the top and the soil feeding tube port 11 is at the bottom.

As shown in fig. 8, 9 and 10, when the tunnel is deformed in a longitudinal direction, the inflatable bags 4 are arranged in the longitudinal direction as shown in fig. 8, the inflatable bags 4 are arranged on the upper half part of the duct piece 1 and are symmetrically arranged along the center of the upward-floating deformation section, the arrangement number is dense in the middle and the two ends are sparse, in the inflation correction process, the inflation is performed symmetrically from the middle inflatable bag 4 to the two sides in sequence, the specific sequence is a, b, c, d and e, in the inflation correction process, as shown in fig. 9, the scheme that the inflatable bags 4 are arranged along the circumferential direction of the duct piece 1, the grouting holes 2 at the two sides closest to the vault are selected for setting the inflatable bags 4, the grouting holes 2 at the two sides are often not symmetrical, in order to ensure that the inflatable bags 4 do not generate additional horizontal deformation in the process of correcting the tunnel upward-floating deformation, an asymmetric inflation correction scheme is required, that the inflation amount of the inflatable bags 4 at the two sides is different, and in the concrete example, the included angle between the inflatable bag 4 at the leftAngle β, α > β, and radius R of left balloon 4 to ensure no additional deformation in the horizontal direction₁Is smaller than the radius R of the right side airbag 4₂I.e. the inflation volume V of the left side airbag 4_αIs less than the inflation quantity V of the right side inflatable bag 4_βSpecifically satisfyAs shown in fig. 10, which is a detailed view of the inside of the air bag 4, since the air bag 4 is arranged on the upper half section of the duct piece 1, the port 10 of the air inflation tube and the port 11 of the soil feeding tube are inserted deeper into the air bag 4, the distance from the top conical cap tip 6 is 5-8mm, the two ports are staggered up and down, the port 10 of the air inflation tube is on, and the port 11 of the soil feeding tube is on the bottom.

The embodiment also provides a construction method for the displacement correction air bag structure of the operation subway tunnel, which comprises the following steps:

1) designing a measuring and arranging scheme: measuring the length and deformation of a tunnel deformation zone interval, marking available grouting holes 2 in the interval range, measuring the angles of the grouting holes 2 at two sides of the same segment 1 as alpha and beta respectively, adopting a scheme of dense middle and sparse two ends along the arrangement of a tunnel longitudinal inflatable bag 4, and reasonably designing the arrangement number, the arrangement interval and the arrangement range of the inflatable bags 4 after calculation and analysis;

2) manufacturing the inflatable bag 4: preparing an inflation tube 8 and a soil conveying tube 9, sleeving an anti-suck-back device on a port 10 of the inflation tube, binding and manufacturing by using three layers of materials of wire netting, filter cloth and wire netting, then enabling the inflation tube 8 and the soil conveying tube 9 to pass through a small hole in a sealing plug 3 and be inserted into an inflation bag 4, selecting a proper insertion depth according to the use position of the inflation bag 4, smearing waterproof paint on a hole channel and the side surface in the sealing plug 3 after the assembly is finished, and placing aside for later use;

3) insertion of the balloon 4: before the filling materials are injected into the grouting holes 2, the inflatable bags 4 are in a folded state, the inflatable bags 4 are pushed into the grouting holes 2 by thrust, a conical cap tip 6 at the tops of the inflatable bags 4 penetrates through a grouting hard shell layer with the thickness of 7-14cm on the surface of the duct piece 1, then the inflatable bags 4 are integrally pushed into a soft soil layer outside the grouting hard shell layer, after the specified depth is reached, the sealing plugs 3 are embedded and fixed in the grouting holes 2, the inner surfaces of the sealing plugs 3 are coated with slurry for waterproof treatment, and the operation is continuously repeated until all the inflatable bags 4 are injected into the specified grouting holes 2;

4) and (3) inflation deviation rectifying process: in cooperation with a real-time tunnel monitoring technology, a first inflator pump 16 and a first speed-limiting control valve 12 are opened, a second speed-limiting control valve 13 is closed, inflation is carried out by using a corresponding inflation tube 8 on each inflation bag 4, the first speed-limiting control valve 12 and a first flowmeter 14 are fully utilized in the inflation process, the inflation amount and the inflation speed of each inflation bag 4 need to be strictly paid attention to, the inflation amount of two circumferential inflation bags 4 is limited according to the inflation amount ratio calculated by the arrangement angle, namely the inflation amount meets the requirement of meeting the requirement of inflation amountAccording to the requirements, the inflation process is carried out synchronously, the inflatable bag 4 close to the center of the deformation zone is inflated and corrected in the longitudinal direction of the tunnel, and then the air is inflated symmetrically towards two sides step by step. Firstly, inflating two inflatable bags 4 of the most central ring, then inflating four inflatable bags 4 on two sides of the central ring, and so on, wherein it is worth noting that information feedback of a real-time monitoring technology is needed in the inflation process, so as to ensure accurate deviation correction amount, the inflation amount of each inflatable bag 4 is adjusted according to the actual deviation correction condition and displacement monitoring data of the tunnel, and if the inflatable bag 4 of a certain ring is inflated too much in the process, the two inflatable bags 4 of the same ring need to be simultaneously exhausted, so as to ensure that the inflation amount of the two inflatable bags 4 of the same ring is always maintained at the initial design ratio, and in addition, in the inflation and expansion process of each inflatable bag 4, the telescopic framework 5 inside each inflatable bag 4 is gradually opened, so as to play a role in stabilizing the shape of the inflatable bags 4;

5) and (3) deformation recovery of the tunnel: after the correction of the tunnel is finished, firstly closing the first speed-limiting control valve 12 and the first inflator pump 16 of each inflatable bag 4 to ensure that the shape and the gas quantity of the inflatable bags 4 are kept unchanged, stabilizing for a period of time, and waiting for the longitudinal deformation of the tunnel to recover;

6) and (3) soil body replacement and filling process: after the longitudinal deformation of the tunnel is recovered, firstly, the second inflator pump 17 is started, the filling soil 19 is sucked into the soil conveying pipe 9 by high-pressure gas, then the second speed-limiting control valve 13 and the first speed-limiting control valve 12 are synchronously and slowly started, the indications of the second flowmeter 15 and the first flowmeter 14 are closely observed, the volume of the gas fed into the soil conveying pipe 9 is strictly controlled to be equal to the volume of the gas discharged from the gas filling pipe 8, the size of the gas filling bag 4 is kept unchanged, when the filling soil 19 is conveyed into the gas filling bag 4, the filling soil 19 cannot be sucked into the gas filling pipe 8 because the anti-suck-back device is arranged at the port 10 of the gas filling pipe, along with the progress of the gas exchange process, the filling soil 19 in the gas filling bag 8 is gradually accumulated until the whole gas filling bag 4 is finally filled, then, light rapid-setting cement mortar is injected into the gas filling bag 4 by using the gas conveying pipe 9, the filling soil 19 in the gas filling bag 4, in the process of soil filling, the central pull rod 7 needs to be locked, namely the opening degree of the telescopic framework 5 is kept unchanged, the shape of the inflatable bag 4 is kept unchanged, and the deviation rectification quality is ensured;

7) and (4) subsequent related work: after the inflatable bag 4 is stable in structure, the second inflator pump 17, the first speed-limiting control valve 12 and the second speed-limiting control valve 13 are closed, the inside of the inflatable bag 4 behind the wall of the duct piece 1 is changed into filling soil 19 from high-pressure gas, the filling soil 19 is the same as the soil quality of surrounding soil layers, the stability after the tunnel deviation correction can be ensured, after the later-stage monitoring result meets the stability requirement, relevant structural equipment inside the duct piece 1 gradually starts to be detached, the sealing plug 3 is pulled out, special sealing treatment is carried out on the grouting hole 2, and the deviation correction work is completed.

The method is suitable for local displacement correction of the operated subway tunnel in the soft soil area in all directions, and is particularly suitable for realizing accurate correction of the correction target when a plurality of pipelines appear in a narrow underground space so as to avoid causing excessive influence on other surrounding pipelines.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.