CN116378683A - Construction method for reinforcing deep buried risk source and overhauling shield simultaneously - Google Patents
Construction method for reinforcing deep buried risk source and overhauling shield simultaneously Download PDFInfo
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- CN116378683A CN116378683A CN202310404191.7A CN202310404191A CN116378683A CN 116378683 A CN116378683 A CN 116378683A CN 202310404191 A CN202310404191 A CN 202310404191A CN 116378683 A CN116378683 A CN 116378683A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 29
- 230000002787 reinforcement Effects 0.000 claims abstract description 99
- 238000012423 maintenance Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
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- 239000002689 soil Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 238000009412 basement excavation Methods 0.000 description 24
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
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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
- E21D9/008—Driving transverse tunnels starting from existing tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction method for reinforcing a deep buried risk source and overhauling a shield at the same time, which comprises the following steps: s10, finding out the position of a risk source; s20, selecting a construction area, wherein the construction area is longitudinally positioned between a risk source and a shield overhaul area and transversely deviates to one side of a shield tunnel; s30, excavating a vertical shaft in a construction area; s40, constructing a transverse cross channel from the vertical shaft to a position between the risk source and the shield overhaul area in the transverse direction; s50, constructing a longitudinal risk source reinforcing transverse channel and a longitudinal shield maintenance transverse channel from the transverse channel to the risk source and the shield maintenance area respectively; s60, performing risk source reinforcement construction operation, and performing shield overhaul. According to the construction method provided by the invention, the construction requirements of the two aspects of risk source reinforcement and shield overhaul are comprehensively considered, so that grouting reinforcement and shield cutter overhaul operation of the existing risk source can be simultaneously carried out, the construction period can be saved, the construction efficiency can be improved, the construction potential safety hazard can be reduced, and the smooth operation of the engineering can be ensured.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a construction method for reinforcing a deep buried risk source and overhauling a shield.
Background
In shield construction for performing underground engineering operations in soft soil and soft rock formations (silt, earth, pebbles, etc.), there are many construction risks. The current classification modes of shield construction risk are as follows: classification according to the reasons of accidents, classification according to the results caused by the accidents, classification according to the prediction capability of people and classification according to the working procedures of shield construction. Among the second category, damage to existing tunnels, existing underground pipelines, existing building structure foundations, and the like is included. If related measures are not taken for the risk sources, the risk sources may cause serious casualties and property loss. To reduce the extent to which these existing structures are affected, construction personnel typically employ reinforcement. The most common mode of reinforcement is grouting, when the depth of burial of a risk source structure is shallow, grouting can be carried out from the ground to an underground structure, when the depth of burial of the risk source structure is deep, the mode of ground grouting cannot be adopted, and only a vertical shaft can be excavated to a designated position, and then grouting reinforcement in a hole is carried out.
The shield tunneling machine drives the cutterhead to rotationally cut and excavate the surface soil layer by means of a motor. In the shield construction, the cutter is reasonably selected and maintained to determine the quality and progress of the shield tunneling project, if the cutter cannot be found and replaced in time, other cutter abrasion can be accelerated, and the cutter abrasion of the shield machine becomes a key problem affecting the project quality. Therefore, the shield construction process needs to pay attention to the abrasion condition of the cutterhead and timely overhaul and tool changing.
Therefore, in the shield construction, the possible risk source needs to be reinforced in time, and shield maintenance is also needed at the same time, namely, the situation that the risk source overlaps with the position of a tool changing (maintenance) well sometimes occurs, namely, the risk source is reinforced at the target position, the maintenance well is excavated, if the risk source and the tool changing (maintenance) well share the same shaft, construction conflict is caused (as shown in fig. 4, according to the prior engineering case, the construction operation (1) and the construction operation (2) are in conflict with each other); if the construction is carried out separately, two shafts are excavated, so that the problems of cost waste, construction period delay, instability and the like caused by interaction of shaft structures are easily caused.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides the construction method for the deep-buried risk source reinforcement and the shield maintenance, which comprehensively considers the construction requirements of the risk source reinforcement and the shield maintenance, can reduce the engineering quantity, save the construction period, improve the construction efficiency and reduce the construction potential safety hazard.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention firstly provides a construction method for reinforcing a deep buried risk source and overhauling a shield, which comprises the following steps: s10, finding out the position of a risk source, and determining that the risk source and a shield overhaul area are both positioned on a shield tunnel; s20, selecting a construction area on the ground based on construction site conditions, wherein the construction area is longitudinally positioned between a risk source and a shield maintenance area and transversely deviates to one side of a shield tunnel; s30, excavating a vertical shaft in the construction area; s40, constructing a transverse channel between a risk source and a shield overhaul area in the transverse direction by the vertical shaft, and excavating the transverse channel at least to the position of a shield tunnel; s50, constructing a longitudinal risk source reinforcing transverse channel and a longitudinal shield maintenance transverse channel to the risk source and the shield maintenance area respectively by the transverse channel; s60, performing risk source reinforcement construction operation by the longitudinal risk source reinforcement transverse channel, and performing shield overhaul by the longitudinal shield overhaul transverse channel.
Further, in S20, the construction area is far away from the risk source in both the longitudinal direction and the transverse direction, and is located outside the coverage area of the risk source and the shield repair area in the transverse direction.
Further, in S40 and S50, the construction transverse channel, the construction longitudinal risk source reinforcement transverse channel and the longitudinal shield maintenance transverse channel are constructed by a step method, and core soil is reserved in the construction process of the step method.
Further, in S60, performing the risk source reinforcement construction operation by the longitudinal risk source reinforcement transverse channel includes: s601, constructing a risk source reinforcement construction operation area in the longitudinal risk source reinforcement transverse channel towards the risk source direction; s602, performing risk source reinforcement construction operation in the risk source reinforcement construction operation area.
Further, in S601, the risk source reinforcement construction work area is close to the risk source.
Further, in S60, performing shield repair by the longitudinal shield repair lateral passage includes: s611, constructing a shield overhaul region in the longitudinal shield overhaul transverse channel towards the shield overhaul region; s612, shield overhaul is carried out in the shield overhaul area.
Further, the method further comprises the following steps: and S70, after the shield overhaul is completed, backfilling construction is carried out, earth backfilling is carried out in the longitudinal risk source reinforcement transverse channel, and the longitudinal shield overhaul transverse channel is reserved.
Further, the risk source reinforcement is one or more of grouting reinforcement, anchor spray reinforcement, anchor cable reinforcement, steel support reinforcement and freezing reinforcement.
The invention also provides a vertical shaft transverse passage combined structure for the construction method, which comprises the following steps: a vertical shaft is longitudinally positioned between the risk source and the shield overhaul area and transversely deviates to one side of the shield tunnel; one end of the transverse cross passage is communicated with the vertical shaft, and transversely extends from the vertical shaft to a position between the risk source and the shield overhaul area, and the other end of the transverse cross passage at least extends to the position of the shield tunnel; the shield tunnel is positioned at one side of the transverse channel, one end of the longitudinal risk source reinforcing transverse channel is communicated with the transverse channel, and the other end extends towards the risk source; and one end of the longitudinal shield overhaul transverse channel is communicated with the transverse channel, and the other end extends to the shield overhaul area.
Further, the method further comprises the following steps: the risk source reinforcement construction operation area is excavated at the other end of the longitudinal risk source reinforcement transverse channel and is close to the risk source, and the risk source reinforcement construction operation area is used for carrying out risk source reinforcement construction operation by constructors; and the shield maintenance area is excavated at the other end of the longitudinal shield maintenance transverse channel and is used for maintenance of the cutter of the shield cutterhead by constructors.
(III) beneficial effects
The invention discloses a construction method for reinforcing a deep buried risk source and overhauling a shield, which can reduce the engineering quantity, save the construction period, improve the construction efficiency and reduce the construction potential safety hazard. Specifically, it has at least the following beneficial effects:
according to the construction method for reinforcing the deep buried risk source and overhauling the shield, provided by the invention, the vertical shaft is excavated between the risk source and the overhauling area of the shield in the longitudinal direction, and is far away from the shield tunnel, so that the safety of the excavation construction of the vertical shaft is ensured, and meanwhile, the disturbance to the risk source is avoided.
According to the construction method for the deep-buried risk source reinforcement and the shield overhaul, provided by the invention, under the condition that only one vertical shaft is excavated, the existing risk source reinforcement and the shield overhaul operation can be simultaneously carried out through the transverse channel construction, so that the construction time is saved, and the smooth operation of the engineering is ensured.
According to the construction method for reinforcing the deep buried risk source and overhauling the shield, provided by the invention, the vertical shaft is not constructed on the shield tunnel between the risk source and the overhauling area of the shield, but is transversely deflected to one side of the shield tunnel, compared with the traditional vertical shaft which is excavated on the shield tunnel, the vertical shaft is far away from the risk source and the overhauling area of the shield, the influence on the risk source and the overhauling area of the shield is small, the vertical shaft is safer, and the safety of construction operation is ensured.
According to the construction method for reinforcing the deep buried risk source and overhauling the shield, the vertical shaft is not constructed on the shield tunnel between the risk source and the overhauling area of the shield, but is deflected to one side of the shield tunnel in the transverse direction, the shield can pass through normally only by partially backfilling the transverse channel after the shield gap is finished, the backfilling of the vertical shaft is avoided, and the normal passing through of the shield is not influenced.
In view of the fact that the vertical shaft is not constructed on the shield tunnel any more, the selection of the position of the vertical shaft is more random and is not strictly restricted any more. For example, when the maintenance area is in a busy urban area, a suitable position can be found to serve as a vertical shaft, and the floor area is occupied as little as possible.
It should be understood that the implementation of any of the embodiments of the invention is not intended to simultaneously possess or achieve some or all of the above-described benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims.
FIG. 1 is a schematic overall flow chart of a construction method according to an embodiment of the present invention;
fig. 2 is a schematic plan view of a shaft transverse channel combined structure according to an embodiment of the present invention;
fig. 3 is a flow chart of shaft locking collar beam construction according to an embodiment of the present invention;
fig. 4 is a schematic plan view of a risk source and shield repair area construction conflict.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be understood that the terms "comprises/comprising," "consists of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method as desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," and the like, does not exclude the presence of other like elements in a product, apparatus, process, or method that includes the element.
It is further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate describing the present invention and to simplify the description, and do not indicate or imply that the devices, components, or structures referred to must have a particular orientation, be configured or operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In actual shield construction, a deep-buried risk source may be encountered, and the deep-buried risk source may overlap with or be located on the line of the shield tunnel at the position of the maintenance (tool changing) well, i.e., the deep-buried risk source may have a large buried depth, for example, the depth is identical to or close to that of the shield tunnel. Under the situation, the deep buried risk source is not suitable for directly grouting and reinforcing by drilling grouting holes in the ground surface, and can only be reinforced underground, at the moment, the risk source is reinforced at the target position, and the inspection well is excavated, if the deep buried risk source and the inspection well share the same vertical shaft, construction conflict can be caused (as shown in fig. 4, the construction operation (1) and the construction operation (2) are mutually conflicting according to the prior engineering case); if the construction is carried out separately, two shafts are excavated, so that the problems of cost waste, construction period delay, instability and the like caused by interaction of shaft structures are easily caused.
Therefore, the invention provides a construction method for reinforcing a deep-buried risk source and overhauling a shield at the same time, in particular to a method for excavating a vertical shaft and transverse channel combined structure, which can finish the operations of reinforcing the deep-buried risk source and overhauling the shield at the same time, shorten the construction period, save the cost and ensure the smooth progress of engineering.
In order to better understand the above technical solution, the following detailed description will refer to the accompanying drawings and specific embodiments.
The construction method for simultaneously reinforcing the deep buried risk source and overhauling the shield, referring to a construction flow chart shown in fig. 1, comprises the following steps: s10, finding out the position of a risk source, designing a shield overhaul region, wherein the risk source and the shield overhaul region are both positioned on a shield tunnel; s20, selecting a construction area on the ground based on construction site conditions, wherein the construction area is longitudinally positioned between a risk source and a shield overhaul area and transversely deviates to one side of a shield tunnel; s30, excavating a vertical shaft in a construction area; s40, constructing a transverse channel from the vertical shaft to a position between the risk source and the shield overhaul area in the transverse direction, and constructing the transverse channel at least to the position of the shield tunnel; s50, constructing a longitudinal risk source reinforcing transverse channel and a longitudinal shield maintenance transverse channel from the transverse channel to the risk source and the shield maintenance area respectively; s60, performing risk source reinforcement construction operation by the longitudinal risk source reinforcement transverse channel, and performing shield overhaul by the longitudinal shield overhaul transverse channel.
In the invention, the position of a risk source is firstly ascertained, and the risk source comprises an existing tunnel, an existing underground pipeline, an existing building structure foundation and the like. When the risk sources are positioned on the shield tunnel, if related measures are not taken for the risk sources, the risk sources can cause serious casualties and property loss. In the existing construction process, in order to reduce the influence degree of shield construction on the existing structures, constructors usually adopt a reinforcing mode. The most common reinforcement mode is grouting, and when the depth of a risk source structure is shallow, grouting can be performed from the ground to the underground. When the risk source structure is deep, the ground grouting mode cannot be adopted, and only the vertical shaft can be excavated to the designated position, and then grouting reinforcement in the hole is carried out.
Because the risk source and the shield overhaul area are both positioned on the shield tunnel, if the shield tunnel between the risk source and the shield overhaul area is constructed by the vertical shaft, the excavation engineering quantity of the transverse passage is minimum, but the requirement of shield construction can be met by backfilling or fully reinforcing the vertical shaft in the later period when the subsequent shield construction is carried out, thus wasting funds and construction period, and if the transverse passage is constructed by beating the vertical shaft aside, the shield can be ensured to normally traverse by only partially backfilling the transverse passage. The present invention therefore selects the construction zone to be longitudinally between the source of risk and the shield repair zone, laterally offset to one of the sides of the shield tunnel, as to the right in fig. 2.
By means of the arrangement of the transverse cross channel, as the vertical shaft is deflected to one side of the shield tunnel in the transverse direction, the vertical shaft cannot affect the risk source and the shield maintenance area, so that the shield maintenance area can be arranged closer to the position of the risk source as much as possible, and the shortest shield maintenance cross channel can be excavated to complete the reinforcement of the risk source and the shield maintenance simultaneously.
The shield repair area is also positioned on the shield tunnel, and is used for repairing and replacing the cutter of the shield cutterhead when the subsequent shield is constructed to the position.
Referring to fig. 2, the construction area is far away from the risk source in the longitudinal direction and the transverse direction, and is located outside the coverage areas of the risk source and the shield repair area in the transverse direction, so as to avoid or reduce the disturbance influence on the risk source structure caused by the subsequent excavation shaft as much as possible. Specifically, how far away from the ground, the construction unit is combined with factors such as shield excavation diameter, shaft excavation diameter, surrounding environment of the ground surface, underground pipelines and the like.
In the invention, the shaft excavation mainly comprises shaft locking collar beam construction, and the locking collar beam construction mainly comprises the working procedures of measuring paying off, earth excavation, reinforcing steel bar binding, formwork erection, concrete pouring and the like.
According to the invention, the construction transverse cross channel, the construction longitudinal risk source reinforcement cross channel and the longitudinal shield overhaul cross channel are constructed by adopting a step method, and core soil is reserved in the construction process of the step method, so that the influence on the structure and the ground surface caused by overlarge stratum settlement in the excavation process is prevented. During the construction of the transverse channel, good ventilation in the hole is ensured, and fresh air is conveyed by the ventilator and the ventilation pipeline in the vertical shaft field region.
In the invention, the construction operation of reinforcing the risk source by reinforcing the transverse channel by the longitudinal risk source further comprises the following steps: constructing a risk source reinforcement construction operation area in the longitudinal risk source reinforcement transverse channel towards the risk source direction; and carrying out risk source reinforcement construction operation in the risk source reinforcement construction operation area.
The risk source reinforcement construction work area is close to the risk source so that constructors can perform risk source reinforcement construction work in the risk source reinforcement construction work area. The excavation size of the longitudinal risk source reinforcement transverse channel is relatively smaller, the requirement that personnel and construction equipment pass through is met, and the risk source reinforcement construction operation area can be an excavation space larger than the longitudinal risk source reinforcement transverse channel in size so as to meet the operation requirement that construction personnel perform reinforcement construction in the excavation space.
In the invention, the risk source reinforcement is reinforcement by grouting, in particular to formation reinforcement by deep hole grouting.
In the invention, shield overhaul by a longitudinal shield overhaul transverse channel comprises the following steps: constructing a shield overhaul region in the longitudinal shield overhaul transverse channel towards the shield overhaul region; and carrying out shield overhaul in the shield overhaul region. Likewise, the excavation size of the longitudinal shield overhaul transverse passage is relatively smaller, the requirement that personnel and construction equipment pass through is met, and the shield overhaul region can be an excavation space larger than the longitudinal shield overhaul transverse passage in size so as to meet the operation requirement that the constructor overhauls and replaces the cutter of the shield cutterhead.
In the invention, after the reinforcement of the risk source and the maintenance of the shield are completed, backfilling construction is further carried out, and earth backfilling is carried out in the longitudinal risk source reinforcement transverse channel. And after the longitudinal risk source reinforcement transverse channel is backfilled, reserving the longitudinal shield overhaul transverse channel for continuous propelling of a subsequent shield machine. Therefore, the shield can be ensured to normally pass through only by backfilling the longitudinal risk source reinforcing transverse channel, the longitudinal shield maintenance transverse channel is not required to be backfilled, the backfilling of a vertical shaft is not required, the engineering quantity is reduced, the normal pass through of the shield is ensured, and the construction efficiency is improved.
Of course, the backfilling needs to be carried out on the risk source reinforcement construction operation area at the end of the longitudinal risk source reinforcement transverse channel.
With continued reference to fig. 2, the present invention further provides a shaft transverse passage assembly structure related to the construction method, including:
a vertical shaft is longitudinally positioned between the risk source and the shield overhaul area and transversely deviates to one side of the shield tunnel;
one end of the transverse cross passage is communicated with the vertical shaft, and extends transversely from the vertical shaft to the space between the risk source and the shield overhaul area, and the other end of the transverse cross passage at least extends to the position of the shield tunnel;
the system comprises a longitudinal risk source reinforcement transverse channel and a risk source reinforcement construction operation area, wherein the longitudinal risk source reinforcement transverse channel is positioned on one side of the transverse channel on a shield tunnel, one end of the longitudinal risk source reinforcement transverse channel is communicated with the transverse channel, the other end of the longitudinal risk source reinforcement transverse channel is communicated with the risk source reinforcement construction operation area, and the risk source reinforcement construction operation area is used for a constructor to perform risk source reinforcement construction operation;
the device comprises a longitudinal shield overhaul transverse channel and a shield overhaul region, wherein the other side of the transverse channel is positioned on a shield tunnel, one end of the longitudinal shield overhaul transverse channel is communicated with the transverse channel, the other end of the longitudinal shield overhaul transverse channel is communicated with the shield overhaul region, and the shield overhaul region is used for carrying out maintenance on a cutter of a shield cutter head by constructors.
At the position of keeping away from existing structure, through excavation shaft, clear up secret silt or silt, build the platform for the construction operation that follows, also be the vent of supplying air simultaneously.
The transverse channel plays a role in simultaneously communicating a risk source to strengthen a construction operation area and a shield overhaul area.
The longitudinal risk source reinforcing transverse channel provides a channel for conveying equipment and materials for grouting reinforcing operation of the existing risk source.
The longitudinal shield overhauling transverse channel provides a channel for conveying equipment and materials for cutter changing (overhauling) operation of a shield cutter head cutter.
According to the invention, the cross section size of the longitudinal risk source reinforcement transverse channel and/or the longitudinal shield overhaul transverse channel is smaller than that of the transverse channel, so that the excavation engineering quantity of the longitudinal risk source reinforcement transverse channel and/or the longitudinal shield overhaul transverse channel is reduced, the requirement of passing personnel and construction equipment is met, the backfilling is still needed, and the backfilling engineering quantity can be reduced.
The risk source reinforcement construction operation area (grouting area) is located at a corresponding position where the risk source is located, for example, below an existing tunnel, an existing underground pipeline, an existing building structure foundation and the like, and is an operation area for grouting reinforcement for constructors.
The shield maintenance area is an operation area for a constructor to carry out maintenance on the cutter of the shield cutterhead.
Engineering application:
bovine street station to financial street station section, the right line section has a starting and stopping mileage of K41+720.402 to K43+604.139, the right line total length 1883.737m, the left line section has a starting and stopping mileage of K41+720.402 to K43+604.139, and the left line section has a total length 1883.854m (including long chain 0.117 m). And (3) penetrating through a section from the line 1 re-emerging gate station to the western single station underground excavation section of the subway, carrying out shield overhaul before crossing, and grouting and reinforcing soil under the section of the existing line 1.
And combining the surrounding environment of the lower penetrating segment, selecting a construction area in the southeast quadrant greenbelt of the intersection of the main street in the recovery gate and the main street in the downtown city, setting a vertical shaft, constructing a transverse passage and a shield maintenance area, and overhauling a cutter disc of the shield machine before the lower penetrating No. 1 line recovery gate station-western single station interval. The construction is carried out by adopting a deep hole grouting reinforcement mine method, the size of a vertical shaft is 6.2m multiplied by 4.4m (length multiplied by width), the depth is 21.24m, and the construction is carried out by adopting a reverse hanging well wall method; the external dimensions of the grouting reinforcement transverse channel are 4.1m multiplied by 3.6m (width multiplied by height), 4.1m multiplied by 4.6m (width multiplied by height) and 5.6m multiplied by 4.1m (width multiplied by height), and the construction is performed by adopting a step method. The outer contour dimensions of the shield overhaul transverse channel are 3.1m multiplied by 3.1m (width multiplied by height), 3.1m multiplied by 4.3m (width multiplied by height) and 3.6m multiplied by 3.1m (width multiplied by height), and the shield overhaul transverse channel is constructed by adopting a step method.
1. Construction of vertical shaft
The construction of the shaft locking ring beam mainly comprises the working procedures of measuring paying off, earth excavation, steel bar binding, formwork erection, concrete pouring and the like. The construction process flow chart is shown in fig. 3, and is specifically as follows.
(1) Locking collar beam excavation and anchor spraying support
Drawing grouting vertical shaft excavation contour lines on the ground according to the design size of the drawing, adopting mechanical excavation, manually matching and trimming, and excavating strictly according to the contour lines, so that underexcavation is avoided, and excavation of a large pot bottom is not required. Step excavation, namely manually removing the bottom and leveling after excavation molding, spraying a thick cushion layer at the bottom of the pit, hanging a reinforcing mesh on the vertical surface, and spraying concrete for supporting.
(2) Locking collar beam reinforcement
The width of the concrete locking collar beam is 1.5m within 0.8m below the ground, and the reinforcement binding is strictly carried out according to the design specification of the drawing. The grouting vertical shaft concrete retaining wall has the specification of 1000mm (height) ×200mm (thickness), is positioned at the outer side of the construction vertical shaft, is provided with a protective railing at the upper part of the retaining wall, and is provided with a drainage ditch at the back. The reinforcement requirements of the concrete retaining wall are as follows:
(1) the welding length of the reinforcing steel bars meets the requirement of single-sided welding 10d, and the overlap joint length of the reinforcing steel bars is not less than 35d; the anchoring length of the stressed steel bars is not less than 35d, and the locking collar beam and the main rib of the concrete retaining wall at the inner side of the wellhead section are anchored into the concrete.
(2) The tail end of the lap joint length is not smaller than 10 times of the diameter of the steel bar from the bending position of the steel bar, the upper steel bar joint is positioned at 1/3 of the midspan, and the lower steel bar joint is positioned at the support.
(3) And preparing binding tools and materials such as 20# to 22# fire wires, reinforcing steel hooks and the like for binding, preparing cement mortar cushion blocks according to the thickness of protective layers of all parts, and keeping the thickness of the net protective layer of the collar beam reinforcing steel bar at the locking port to be not less than 40mm.
(4) When concrete is poured, special people must be arranged on duty to find out that the steel bar is displaced or loosened and corrected in time.
(5) And pre-burying a lifting derrick foundation, a wellhead guard rail steel pipe and a pedestrian escalator embedded part before concrete pouring.
(3) Concrete pouring
And binding the steel bars of the fore shaft ring beam, and performing fore shaft ring beam concrete pouring construction after finishing the formwork erection and checking to be qualified through supervision, wherein the fore shaft ring beam and the wellhead section concrete retaining wall are poured at one time. When concrete is poured, the vertical connecting ribs of the vertical shaft steel grating should be reserved so as to ensure well excavation. Meanwhile, the embedded bolts of the lifting frame are ensured to be vertical, and the protection is perfect. The concrete pouring adopts a 5cm inserted vibrating rod to vibrate, and the vibration follows the principle of quick insertion and slow extraction. The casting of the locking ring beam is completed at one time, the casting is performed in layers, the casting thickness of each layer is controlled to be about 300-500 mm, the time between layers is shortened as much as possible, and cold joints are not generated. In the concrete pouring process, the height difference of concrete pouring surfaces at two sides is not more than 0.5 meter, and the integral deviation of a scaffold support system caused by overlarge deviation is avoided.
2. Risk source grouting reinforcement
In order to control the sedimentation of the underground pipeline, the surface sedimentation value, the pipeline sedimentation value, the in-hole arch top sedimentation and the structure convergence value are controlled within the allowable range, the safety of the pipeline and the structure is ensured, and deep hole grouting is adopted for stratum reinforcement. And (3) performing pre-grouting reinforcement on the stratum around the primary support structure to form partial reinforcement rings, so that disturbance of the primary support structure construction on the peripheral pipeline is reduced, and the effect of controlling sedimentation and deformation of the peripheral pipeline is achieved.
The longitudinal length of deep hole grouting is 12m, a double-pipe back-type grouting process is adopted, 4 angles are adopted for continuous grouting in each hole, the circumferential spacing of grouting holes is 900mm, and the planned grouting diffusion radius is 600mm. Grouting parameters are determined according to the field test conditions, monitoring and measurement are enhanced, and damage to the existing building (construction) is avoided.
In order to prevent the occurrence of slurry mixing, grouting is performed by adopting measures such as hole separation grouting or hole jump distance increase. Before the formal grouting construction, 1-2 holes are adopted for grouting experiments, grouting parameters are checked and adjusted, and the mixing ratio and pressure of the slurry are adjusted in time to ensure that a good grouting effect is achieved.
3. Earthwork backfill
And after the maintenance of the shield cutterhead is completed, performing an earthwork backfilling procedure, and backfilling the well-graded broken stone fine sand. After the grouting reinforcement transverse channel is backfilled, the shield maintenance transverse channel is reserved and used for continuous propelling of a subsequent shield machine.
4. Application benefit
By adopting the construction process between the cattle street station and the financial street station, the shield cutter head tool maintenance work is smoothly carried out while the risk source is reinforced, so that the cost waste is avoided, the construction efficiency is improved, the construction period is saved, the construction safety is ensured, and the construction method has good social benefit.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
While several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.
Claims (10)
1. The construction method for simultaneously reinforcing the deep buried risk source and overhauling the shield is characterized by comprising the following steps of:
s10, finding out the position of a risk source, and determining that the risk source and a shield overhaul area are both positioned on a shield tunnel;
s20, selecting a construction area on the ground based on construction site conditions, wherein the construction area is longitudinally positioned between a risk source and a shield maintenance area and transversely deviates to one side of a shield tunnel;
s30, excavating a vertical shaft in the construction area;
s40, constructing a transverse channel between a risk source and a shield overhaul area in the transverse direction by the vertical shaft, and excavating the transverse channel at least to the position of a shield tunnel;
s50, constructing a longitudinal risk source reinforcing transverse channel and a longitudinal shield maintenance transverse channel to the risk source and the shield maintenance area respectively by the transverse channel;
s60, performing risk source reinforcement construction operation by the longitudinal risk source reinforcement transverse channel, and performing shield overhaul by the longitudinal shield overhaul transverse channel.
2. The construction method according to claim 1, wherein in S20, the construction zone is located both longitudinally and laterally away from the risk source and laterally outside the coverage area of the risk source and shield repair zone.
3. The construction method according to claim 1, wherein in S40 and S50, the construction transverse channel, the construction longitudinal risk source reinforcement transverse channel and the longitudinal shield maintenance transverse channel are constructed by a step method, and core soil is reserved in the construction process of the step method.
4. The construction method according to claim 1, wherein in S60, performing the risk source reinforcement construction work by the longitudinal risk source reinforcement lateral passage includes:
s601, constructing a risk source reinforcement construction operation area in the longitudinal risk source reinforcement transverse channel towards the risk source direction;
s602, performing risk source reinforcement construction operation in the risk source reinforcement construction operation area.
5. The construction method according to claim 4, wherein in S601, the risk source reinforcement construction work area is close to the risk source.
6. The construction method according to claim 1, wherein in S60, the shield repair by the longitudinal shield repair lateral passage includes:
s611, constructing a shield overhaul region in the longitudinal shield overhaul transverse channel towards the shield overhaul region;
s612, shield overhaul is carried out in the shield overhaul area.
7. The construction method according to claim 1, characterized by further comprising: and S70, after the shield overhaul is completed, backfilling construction is carried out, earth backfilling is carried out in the longitudinal risk source reinforcement transverse channel, and the longitudinal shield overhaul transverse channel is reserved.
8. The construction method according to any one of claims 1 to 7, wherein the risk source reinforcement is one or more of grouting reinforcement, anchor spray reinforcement, anchor line reinforcement, steel support reinforcement, and freeze reinforcement.
9. A shaft cross passage assembly structure for use in the construction method according to any one of claims 1 to 8, characterized by comprising:
a vertical shaft is longitudinally positioned between the risk source and the shield overhaul area and transversely deviates to one side of the shield tunnel;
one end of the transverse cross passage is communicated with the vertical shaft, and transversely extends from the vertical shaft to a position between the risk source and the shield overhaul area, and the other end of the transverse cross passage at least extends to the position of the shield tunnel;
the shield tunnel is positioned at one side of the transverse channel, one end of the longitudinal risk source reinforcing transverse channel is communicated with the transverse channel, and the other end extends towards the risk source;
and one end of the longitudinal shield overhaul transverse channel is communicated with the transverse channel, and the other end extends to the shield overhaul area.
10. The hoistway cross passage assembly structure of claim 9, further comprising:
the risk source reinforcement construction operation area is excavated at the other end of the longitudinal risk source reinforcement transverse channel and is close to the risk source, and the risk source reinforcement construction operation area is used for carrying out risk source reinforcement construction operation by constructors;
and the shield maintenance area is excavated at the other end of the longitudinal shield maintenance transverse channel and is used for maintenance of the cutter of the shield cutterhead by constructors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310404191.7A CN116378683A (en) | 2023-04-17 | 2023-04-17 | Construction method for reinforcing deep buried risk source and overhauling shield simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310404191.7A CN116378683A (en) | 2023-04-17 | 2023-04-17 | Construction method for reinforcing deep buried risk source and overhauling shield simultaneously |
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| Publication Number | Publication Date |
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| CN116378683A true CN116378683A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310404191.7A Pending CN116378683A (en) | 2023-04-17 | 2023-04-17 | Construction method for reinforcing deep buried risk source and overhauling shield simultaneously |
Country Status (1)
| Country | Link |
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| CN (1) | CN116378683A (en) |
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2023
- 2023-04-17 CN CN202310404191.7A patent/CN116378683A/en active Pending
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