CN111734420B - Water-rich stratum shield underwater receiving method provided with tunnel portal mortar retaining wall - Google Patents
Water-rich stratum shield underwater receiving method provided with tunnel portal mortar retaining wall Download PDFInfo
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- CN111734420B CN111734420B CN202010547544.5A CN202010547544A CN111734420B CN 111734420 B CN111734420 B CN 111734420B CN 202010547544 A CN202010547544 A CN 202010547544A CN 111734420 B CN111734420 B CN 111734420B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000005641 tunneling Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 7
- 239000011435 rock Substances 0.000 abstract description 3
- 239000002689 soil Substances 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 6
- 239000011440 grout Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009933 burial Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000003973 irrigation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Architecture (AREA)
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- Geology (AREA)
- Environmental & Geological Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a water-rich stratum shield underwater receiving method with a tunnel portal mortar retaining wall, which comprises the following steps of S1: reinforcing the end of the receiving well and performing precipitation construction; s2: pre-burying a grouting pipe on the earth surface of the end of the receiving well; s3: pouring a bottom hole mortar receiving base; s4: receiving and pouring a mortar water retaining wall at a tunnel portal; s5: water pressure inside and outside the water filling balance pit in the well; s6: the shield is tunneled to the shield tail to be separated from the water retaining wall, and secondary grouting in the tunnel and ground grouting are synchronously performed to quickly and effectively plug the tunnel portal; s7: pumping water from a receiving well; s8: breaking the water retaining wall in a layered manner, and plugging a portal above the receiving base by an annular steel plate; s9: the shield is disassembled and hoisted out, the receiving base is broken in a layered mode, and the remaining tunnel portal is plugged by a steel plate; s10: and closing the dewatering well to complete the receiving. The method is suitable for shield receiving under the condition that the tunnel buried depth is large in pressure-bearing water head height or the receiving section is located on a half-rock half-sand/soil layer, and solves the technical problem that the existing underwater receiving method is prone to causing that the tunnel portal is not blocked in place while the safety is guaranteed.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a water-rich stratum shield underwater receiving method with a portal mortar retaining wall.
Background
In recent years, shield tunnels are developed explosively in China, and a plurality of shield tunnels are constructed in the fields of highways, railways, subways, water delivery, gas delivery, electric power and the like. The shield receiving is one of the key processes of the shield construction, and has larger safety risk. In shield reception of water-rich strata, a shield underwater receiving method of water filling in a receiving well or soil covering water filling has been applied for many times in recent years as a technology with higher safety guarantee rate.
In the receiving of the shield water-rich stratum, the underwater receiving method is based on the following 4 types of conditions: (1) the end head of the receiving well has no construction conditions of reinforcement and precipitation; (2) the receiving well can be reinforced by the end head, but the periphery of the end head has important building structures, so that the well point precipitation cannot be implemented due to great precipitation influence; (3) the receiving well can be reinforced at the end, but the tunnel burial depth is large, the confined water head is high, and the precipitation can not be ensured to be in place; (4) the receiving well can implement end reinforcement, but the stratum of the receiving section of the tunnel is positioned on a half rock-half sand/soil layer, and the water depth is difficult to reduce to a rock surface line.
The existing underwater shield receiving method for the water-rich stratum has the advantages that the risk of water burst and sand/mud gushing at the tunnel portal caused by a conventional non-underwater receiving mode is effectively avoided, and the shield receiving safety is improved; the method has the disadvantages that the door curtain cloth and the folding pressing plate are mostly adopted as a hole-outlet waterproof device, the state of the device cannot be monitored under an underwater receiving environment, and the risk that the curtain cloth is damaged by a cutter head when the hole is outlet exists; the tensioning effect of the steel wire rope on the curtain cloth wrapping shield or the duct piece cannot be ensured. In addition, during the receiving of the water-rich sand layer, the grouting plugging effect in the tunnel is poor due to the instantaneous settlement of the sand layer, and the tunnel portal plugging range is limited to the vicinity of the building envelope and the tunnel portal steel ring. Above not enough causes the easy emergence of the not-in-place phenomenon of portal shutoff, receives the well after the completion under water and draws water or the secondary seepage risk of portal probably appears in the process of portal sealing device demolishs.
Disclosure of Invention
In order to overcome the technical defect that the existing shield underwater receiving method in the prior art is easy to cause the defect that the tunnel portal cannot be blocked in place, the invention provides a water-rich stratum shield underwater receiving method with a tunnel portal mortar retaining wall, which is suitable for shield receiving under the conditions that a tunnel receiving section is buried deeply and has a high bearing water head or a receiving section tunnel is positioned in a half-rock and half-sand/ground layer, and the technical problem is solved on the premise of ensuring safe receiving.
The invention realizes the aim through the following technical scheme, and provides a water-rich stratum shield underwater receiving method provided with a tunnel portal mortar retaining wall, which comprises the following steps:
s1: the method comprises the following steps of (1) receiving well end reinforcement and precipitation construction, wherein a stratum at the receiving well end is reinforced by a jet grouting pile or a stirring pile, and precipitation construction is carried out by arranging a certain number of precipitation wells on the inner side and the outer side of a reinforcement area after an end reinforcement body is finished;
s2: carrying out pre-buried grouting pipe construction on the earth surface at the outer edge of the receiving well end enclosure structure, drilling a certain number of grouting holes at the outer edge of the receiving well end enclosure structure and around the position right above the tunnel, controlling the hole bottom elevation to be 1.5-2 m above the tunnel, and installing grouting pipes after drilling is finished;
s3: pouring construction of a receiving well base mortar receiving base is carried out, M10 cement mortar is poured and has equal strength on the receiving well base, the pouring height is lower than the center line of a tunnel portal, horizontal counter force is provided for tunneling of a shield machine, and meanwhile, a shield machine bearing base is formed after a shield machine cuts a mortar layer;
s4: receiving pouring construction of the well base mortar retaining wall, pouring an M10 mortar retaining wall on the side of the portal on the basis of the mortar receiving base according to the diameter of the shield, wherein the height of the mortar retaining wall is higher than the top of the portal steel ring;
s5: the shield is tunneled into an end reinforcing area, water is filled into a receiving well to balance the internal and external water pressures of the pit, after the reinforcing body of the end reinforcing area, a receiving well base mortar receiving base, a mortar water retaining wall and the like are completed, the shield can be tunneled into the end reinforcing area, water is filled into the receiving well at the same time, the filling height is higher than the still water level of a dewatering well, and after the shield is tunneled to the tail of the shield and enters the reinforcing area, a muddy water glass double-slurry seal ring is timely filled behind a segment at the entrance of the reinforcing area;
s6: the method comprises the following steps that a shield is tunneled into a receiving well, the shield is tunneled to a shield tail mortar removal retaining wall, secondary grouting in the hole and grouting pipe reserved on the ground for grouting are synchronously carried out to rapidly plug a hole door, a shield machine cuts an end enclosure structure and the mortar retaining wall, tunneling is carried out in a fully closed mode after entering the receiving well, a slag discharging system is closed, water level change in the receiving well is closely monitored, after the shield is tunneled to the shield tail mortar removal retaining wall, multiple points are immediately selected from the end enclosure structure of the receiving well to the end portion of the mortar retaining wall to carry out secondary grouting simultaneously, grouting pipe pre-buried on the ground surface is opened, and two grouting modes are synchronously carried out, so that the hole door is rapidly and effectively plugged, and cement water glass biliquid is selected for grout;
s7: in the process of water pumping of a receiving well and hole door plugging, the water level change condition is continuously monitored, after the water level is not changed and is stable for more than 12 hours, and no water flows out when a hoisting hole grouting ball valve at the top of a segment at a hole door is opened, so that water pumping can be started, in the process of water pumping, pumping drainage is suspended after the water level of the receiving well drops for a certain height, the water level change is monitored for 1-2 hours, if the water level does not rise and the grouting ball valve at the hole door does not flow out at the same time, pumping drainage is continued, if abnormal conditions exist, pumping drainage is stopped, grouting is continued, water is taken and re-pumped if necessary, and the above processes are repeated until water pumping is completed;
s8: the mortar retaining wall in the receiving well is broken in a layered mode, an annular steel plate is used for plugging a part of a portal above a mortar receiving base, after drainage is completed, breaking operation of the mortar retaining wall at the portal is timely organized, the mortar retaining wall is broken in a layered mode, plugging is carried out by adopting the annular steel plate, the thickness of the annular steel plate is 10-20mm, the annular steel plate is divided into a plurality of blocks according to the outer diameter of shield segments, a layer of cotton cloth is stuffed in advance on an overhanging contact surface of each segment when the steel plate is plugged, one end of each cotton cloth abuts against the segment, the other end of each cotton cloth abuts against the steel ring of the portal, and two sides of each steel plate are welded with adjacent blocked steel plates;
s9: the shield is disassembled and hoisted out, the mortar receiving base is broken layer by layer, the annular steel plate blocks part of the portal below the mortar receiving base, in the step S8, because the mortar receiving base is not broken, the remaining portal is blocked after the shield is hoisted out and the mortar receiving base is broken layer by layer, and the blocking method is the same as the step S8;
s10: and after the steel plate plugging is finished, closing the dewatering well, cleaning the interior of the receiving well, finishing the receiving work, and finishing the work of dismantling the plugging wall if the large-section receiving work well is used for carrying out underwater receiving in the temporary steel-concrete plugging wall.
According to the method for receiving the water-rich stratum shield underwater provided with the tunnel portal mortar retaining wall, the tunnel portal range of the receiving well end enclosure structure uses the glass fiber ribs.
According to the underwater shield receiving method for the water-rich stratum with the tunnel portal mortar retaining wall, in order to avoid the tunnel portal pipe piece from loosening, the last 10-15 ring pipe pieces of the shield in the tunnel are subjected to multi-point position section steel welding and longitudinally tensioned.
Generally, compared with the prior art, the technical scheme of the invention can achieve the following beneficial effects:
1. according to the method, the inner and outer water pressures are balanced by combining the reinforcement of the end of the receiving well and the precipitation with the irrigation of water in the foundation pit, so that water gushing and mud/sand gushing at the portal are effectively prevented, the water flow speed at the portal is obviously reduced, the difficulty of grouting and plugging in the portal is effectively reduced, and the shield receiving safety is guaranteed;
2. according to the invention, the mortar receiving base is arranged to provide sufficient counter force for shield tunneling, so that the segments are fully propped tightly, and the risk of segment leakage at the receiving section is avoided;
3. according to the invention, the mortar water retaining wall is arranged on the mortar receiving base, and a conventional tunnel portal sealing device is not required, so that the risks that the mortar water retaining wall is damaged by a cutter head and a shield or a duct piece cannot be effectively wrapped when the tunnel is out of the ground and cannot be monitored in an underwater receiving environment are effectively avoided; reducing the gap of the portal plugging, and reducing the gap of the portal plugging from the inner diameter of a portal steel ring minus the outer diameter of the duct piece to the excavating diameter of the shield cutter head minus the outer diameter of the duct piece; the grouting plugging distance is increased, the plugging range of the tunnel portal is extended to the end part of the mortar retaining wall from the vicinity of the enclosure structure and the tunnel portal steel ring, and the grouting of a grouting pipe reserved on the ground is matched, so that the tunnel portal can be plugged quickly and effectively; the grouting plugging distance is long, the annular steel plate is sealed along with breaking, the risk of secondary leakage of the portal in the process of pumping water of the receiving well and breaking mortar is effectively avoided, and the grouting pipe is reserved on the ground for grouting, so that the technical problem that the existing underwater receiving method for the water-rich stratum is prone to causing that the portal is not plugged in place is safely and effectively solved.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic plan view of a water-rich stratum shield underwater receiving method provided with a portal mortar retaining wall, which is applied to a small-section receiving working well;
FIG. 2 is a schematic longitudinal section view of a water-rich stratum shield underwater receiving method provided with a portal mortar retaining wall applied to a small-section receiving working well according to the invention;
FIG. 3 is a schematic plan view of a water-rich stratum shield underwater receiving method provided with a portal mortar retaining wall and applied to a large-section receiving working well according to the invention;
FIG. 4 is a partially enlarged schematic view of a cross section at a portal of a receiving working well in a water-rich stratum shield underwater receiving method provided with a portal mortar retaining wall according to the present invention;
in the figure: 1-a receiving well, 11-a receiving well end enclosure structure, 2-a receiving well end stratum, 3-a dewatering well, 4-a grouting pipe, 5-a mortar receiving base, 6-a mortar water retaining wall, 61-an aerated brick bed course, 7-a steel-concrete plugging wall, 8-a portal steel ring and 9-a duct piece.
Detailed Description
As shown in fig. 1 and fig. 2, a plane schematic diagram and a section schematic diagram of a water-rich stratum shield underwater receiving method provided with a tunnel portal mortar retaining wall, which is applied to a small-section receiving working well, are shown, and the receiving method comprises the following steps:
the method comprises the following steps: reinforcing the end of a receiving well 1 and performing precipitation construction, namely reinforcing a stratum 2 at the end of the receiving well by adopting a rotary jet pile or a stirring pile, and after the strength of an end reinforcing body is equal, drilling precipitation wells 3 inside and outside a reinforcing area to perform precipitation construction so as to reduce the water head at the end as much as possible;
step two: constructing a ground surface pre-buried grouting pipe 4 on the outer edge of the receiving well end enclosure structure 11, drilling a certain number of grouting holes on the outer edge of the receiving well end enclosure structure 11 and the periphery right above the tunnel, controlling the hole bottom elevation to be 1.5-2 m above the tunnel, and installing the grouting pipe 4 after drilling;
step three: pouring construction of a mortar receiving base 5 at the base of the receiving well 1, wherein M10 cement mortar is poured and has equal strength at the base of the receiving well 1, the pouring height is lower than the central line of a tunnel portal, horizontal counter force is provided for tunneling of a shield machine, and meanwhile, a shield machine bearing base is formed after a shield machine cuts a mortar layer;
step four: pouring construction of the mortar retaining wall 6 at the base of the receiving well 1, pouring an M10 mortar retaining wall 6 on the side of the portal on the basis of the mortar receiving base 5 according to the diameter of the shield, wherein the height of the mortar retaining wall 6 is higher than the top of the portal steel ring 8;
step five: the shield is tunneled into an end reinforcing area, water is filled into the receiving well 1 to balance the internal and external water pressure of the pit, after the reinforcing body of the end reinforcing area, a mortar receiving base 5 and a mortar water retaining wall 6 at the base of the receiving well 1 are reinforced, the shield can be tunneled into the end reinforcing area, water is filled into the receiving well 1 at the same time, the water filling height is higher than the still water level of the dewatering well 3, and after the shield is tunneled to the shield tail to enter the reinforcing area, a muddy water glass double-liquid slurry seal ring is timely injected behind a pipe piece 9 at the inlet of the reinforcing area;
step six: the shield is tunneled into the receiving well 1, the shield is tunneled to the shield tail to remove the mortar retaining wall 6, secondary grouting in the tunnel and grouting of the reserved grouting pipe 4 on the ground are synchronously carried out to rapidly plug the tunnel portal, the shield machine cuts the retaining structure 11 at the end of the receiving well and the mortar retaining wall 6, after entering the receiving well 1, tunneling in a totally-enclosed mode, closing a slag discharging system, simultaneously closely monitoring the water level change in the receiving well 1, after the shield tunneling to the shield tail mortar-removed water retaining wall 6, a plurality of point positions are selected from the range from the receiving well end enclosure structure 11 to the end part of the mortar retaining wall 6 for secondary grouting at the same time, opening the surface pre-buried grouting pipe 4 for grouting, synchronously performing two grouting modes to quickly and effectively plug a tunnel portal, selecting cement-water-glass double-liquid grout for grout, and performing multi-point section steel welding longitudinal tensioning on the 10-15 ring segments 9 at the last when the shield is out of the tunnel in order to avoid the relaxation of the segment 9 at the tunnel portal;
step seven: in the process of water pumping of the receiving well 1 and hole door plugging, the water level change condition is continuously monitored, after the water level is not changed and is stable for more than 12 hours, and no water flows out when the hoisting hole grouting ball valve at the top of the pipe piece 9 at the hole door is opened, so that water pumping can be started, in the process of water pumping, the water pumping of the receiving well 1 is suspended after the water level is lowered for a certain height, the water level change is monitored for 1-2 hours, if the water level is not raised and the grouting ball valve at the hole door does not flow out at the same time, the water pumping is continued, if abnormal conditions exist, the water pumping is stopped, the grouting is continued, if necessary, the water pumping and recharging are repeated until the water pumping is completed;
step eight: the mortar retaining wall 6 in the receiving well 1 is broken in a layered mode, the annular steel plate blocks a part of a tunnel portal above a mortar receiving base 5, after drainage is completed, breaking operation of the mortar retaining wall 6 at the tunnel portal is timely organized, the mortar retaining wall 6 is broken in a layered mode, blocking is carried out by adopting an annular steel plate, the thickness of the annular steel plate is 10-20mm, the annular steel plate is divided into a plurality of blocks according to the outer diameter of a shield segment 9, a layer of cotton cloth is stuffed in advance on an overhanging contact surface of the segment 9 when the steel plate is blocked, one end of the cotton cloth abuts against the segment 9, the other end of the cotton cloth is welded with a tunnel portal steel ring 8, and two sides of the cotton cloth are welded with adjacent blocked steel plates;
step nine: the shield is disassembled and hoisted out, the mortar receiving base 5 is broken layer by layer, the annular steel plate blocks part of the portal below the mortar receiving base 5, in the step eight, because the mortar receiving base 5 is not broken, residual portal blocking is required to be carried out after the shield is hoisted out and the mortar receiving base 5 is broken layer by layer, and the blocking method is the same as the step eight;
step ten: and after the steel plate plugging is finished, closing the dewatering well 3, cleaning the interior of the receiving well 1, finishing the receiving work, and if the large-section receiving work well is used for carrying out underwater receiving in the temporary steel-concrete plugging wall 7, finishing the dismantling work of the steel-concrete plugging wall 7.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A water-rich stratum shield underwater receiving method provided with a tunnel portal mortar retaining wall is characterized by comprising the following steps:
s1: reinforcing the end of the receiving well (1) and performing precipitation construction, wherein a rotary jet pile or a stirring pile is adopted to reinforce the stratum (2) at the end of the receiving well, and after the end reinforcing body is finished, precipitation wells (3) are arranged on the inner side and the outer side of a reinforcing area to perform precipitation construction;
s2: pre-burying grouting pipes (4) on the earth surface at the outer edge of a receiving well end enclosure structure (11), drilling a certain number of grouting holes at the outer edge of the receiving well end enclosure structure (11) and around the position right above a tunnel, controlling the hole bottom elevation to be 1.5-2 m above the tunnel, and installing the grouting pipes (4) after drilling;
s3: pouring construction of a mortar receiving base (5) at the base of the receiving well (1), wherein M10 cement mortar is poured at the base of the receiving well (1) with equal strength, the pouring height is lower than the central line of a tunnel portal, horizontal counter force is provided for tunneling of the shield tunneling machine, and meanwhile, a shield tunneling machine bearing base is formed after a shield cutting mortar layer is finished;
s4: the pouring construction of the mortar retaining wall (6) at the base of the receiving well (1) is carried out, according to the diameter of a shield, an M10 mortar retaining wall (6) is poured on the side of the tunnel portal on the basis of the mortar receiving base (5), and the height of the mortar retaining wall (6) is higher than the top of a steel ring (8) of the tunnel portal;
s5: the shield is tunneled into an end reinforcing area, water is filled into a receiving well (1) to balance water pressure inside and outside a pit, after the reinforcing body of the end reinforcing area, a mortar receiving base (5) at the base of the receiving well (1), a mortar water retaining wall (6) and the like are completed, the shield can be tunneled into the end reinforcing area, water is filled into the receiving well (1) at the same time, the water filling height is higher than the still water level of a dewatering well (3), and after the shield is tunneled to the shield tail and enters the reinforcing area, a muddy water glass double-liquid-slurry seal ring is timely injected behind a pipe piece (9) at the inlet of the reinforcing area;
s6: the method comprises the steps that a shield is tunneled into a receiving well (1), the shield is tunneled to a shield tail mortar removal water retaining wall (6), secondary grouting in the hole and grouting of a reserved grouting pipe (4) on the ground are synchronously carried out to rapidly plug a hole door, a shield machine cuts an end enclosure structure (11) and the mortar water retaining wall (6), after entering the receiving well (1), tunneling is carried out in a fully closed mode, a slag discharging system is closed, water level change in the receiving well (1) is closely monitored, after the shield is tunneled to the shield tail mortar removal water retaining wall (6), multiple point positions are immediately selected from the end enclosure structure (11) of the receiving well to the end portion of the mortar water retaining wall (6) to carry out secondary grouting simultaneously, grouting pipes (4) on the ground surface are opened for grouting, two grouting modes are carried out synchronously, rapid and effective plugging of the hole door is realized, and cement water glass dual-liquid slurry is selected;
s7: in the process of pumping water from a receiving well (1), continuously monitoring the water level change condition, stopping pumping after the water level is not changed and stably exceeds 12 hours and no water flows out when a hoisting hole grouting ball valve at the top of a duct piece (9) at a portal is in an open state, so that pumping water can be started, in the process of pumping water, pumping drainage is suspended after the water level of the receiving well (1) drops to a certain height, monitoring the water level change for 1-2 hours, if the water level does not rise and no water flows out from the grouting ball valve at the portal at the same time, pumping drainage is continued, if abnormal conditions exist, pumping drainage is stopped, grouting is continued, water is taken for recharging if necessary, and the above processes are repeated until pumping water is pumped;
s8: the mortar retaining wall (6) in the receiving well (1) is broken in a layered mode, an annular steel plate blocks a part of a portal above a mortar receiving base (5), after drainage is completed, breaking operation of the mortar retaining wall (6) at the portal is required to be timely organized, the mortar retaining wall (6) is required to be broken in a layered mode, the annular steel plate is adopted for blocking, the thickness is 10-20mm, the annular steel plate is divided into a plurality of blocks according to the outer diameter of a shield segment (9), a layer of cotton cloth is stuffed in advance on an extending contact surface of the steel plate and the segment (9) during blocking, one end of the steel plate abuts against the segment (9), the other end of the steel plate is welded with a portal steel ring (8), and two sides of the steel plate are welded with adjacent blocked steel plates;
s9: the shield is disassembled and hoisted, the mortar receiving base (5) is broken in a layered mode, the circumferential steel plate blocks part of the portal below the mortar receiving base (5), in the step S8, because the mortar receiving base (5) is not broken, residual portal blocking is required to be carried out after the shield is hoisted out and the mortar receiving base (5) is broken in a layered mode, and the blocking method is the same as that in the step S8;
s10: and after the steel plate plugging is finished, closing the dewatering well (3), cleaning the interior of the receiving well (1), finishing the receiving work, and if the large-section receiving working well is used for receiving underwater in the temporary steel-concrete plugging wall (7), finishing the dismantling work of the plugging wall.
2. The method for receiving the water-rich stratum shield underwater provided with the hole door mortar retaining wall as claimed in claim 1, is characterized in that: the hole door range of the receiving well end enclosure structure (11) uses glass fiber reinforced plastics.
3. The method for receiving the water-rich stratum shield underwater provided with the hole door mortar retaining wall as claimed in claim 1, is characterized in that: in order to avoid the looseness of the duct piece at the opening of the tunnel, the tunnel shield is taken out, and finally 10-15 ring duct pieces (9) are subjected to multi-point position section steel welding and longitudinally tensioned.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704266A (en) * | 2020-12-02 | 2022-07-05 | 中铁六局集团有限公司交通工程分公司 | Construction method for reinforcing end of shield zone of soft soil layer in karst development area |
| CN112647962A (en) * | 2020-12-18 | 2021-04-13 | 上海隧道工程有限公司 | Method for rapidly entering and exiting hole under air shaft with small curvature radius and shield base |
| CN112901266A (en) * | 2021-03-25 | 2021-06-04 | 中建七局第一建筑有限公司 | Water burst prevention system for extra-long tunnel and construction method thereof |
| CN113216987B (en) * | 2021-06-25 | 2022-07-19 | 南通城市轨道交通有限公司 | Method for constructing water-rich sand layer shield machine through water supply pipe and river starting and receiving |
| CN113914872A (en) * | 2021-09-01 | 2022-01-11 | 武汉市政工程设计研究院有限责任公司 | Long-distance drainage deep tunnel shield method for penetrating complex stratum |
| CN114370286B (en) * | 2021-12-08 | 2024-06-04 | 上海市基础工程集团有限公司 | Safety hole entering method of shield machine for open caisson structure |
| CN117007378B (en) * | 2023-09-25 | 2023-12-15 | 上海勘测设计研究院有限公司 | Geological stratification water pumping test device |
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