CN108590695B - Communication channel shield construction method and communication channel - Google Patents
Communication channel shield construction method and communication channel Download PDFInfo
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- CN108590695B CN108590695B CN201810537259.8A CN201810537259A CN108590695B CN 108590695 B CN108590695 B CN 108590695B CN 201810537259 A CN201810537259 A CN 201810537259A CN 108590695 B CN108590695 B CN 108590695B
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- 238000010276 construction Methods 0.000 title claims abstract description 57
- 238000004891 communication Methods 0.000 title claims description 45
- 238000000034 method Methods 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 230000005641 tunneling Effects 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims description 61
- 239000003921 oil Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 23
- 238000009412 basement excavation Methods 0.000 abstract description 9
- 230000001360 synchronised effect Effects 0.000 abstract description 9
- 230000008014 freezing Effects 0.000 description 10
- 238000007710 freezing Methods 0.000 description 10
- 238000005192 partition Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000003673 groundwater Substances 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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 DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- 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
Abstract
The invention discloses a shield construction method of a connecting channel and the connecting channel, which gradually assemble and lengthen a shield shell in the shield construction process and finally remain in soil bodies to form an lengthened shield shell extending from a starting end to a receiving end, so that the soil bodies corresponding to the whole connecting channel are supported by the lengthened shield shell, the generation of gaps at the tail of the shield is stopped, synchronous grouting is not needed in the tunneling process, a large amount of personnel and equipment operation space required by synchronous grouting is saved, and the construction difficulty and the construction cost can be greatly reduced; in addition, the steel lengthened shield shell is reserved in soil body to serve as a primary lining, so that the structural strength of the whole connecting channel can be further improved, and the problems of collapse of an excavation surface, subsidence of the earth surface and the like are prevented.
Description
Technical Field
The invention relates to the technical field of communication channels, in particular to a communication channel shield construction method and a communication channel.
Background
The communication channel is arranged between two main tunnels (such as subway tunnels, highway tunnels, pipe galleries or deep buried drainage tunnels) and is connected with the two main tunnels, the length is generally within 50 meters, and the communication channel is about ten meters in many cases and plays roles of communication, drainage, overhaul, fire rescue and the like. Taking a subway tunnel or a highway tunnel as an example, if one main tunnel is in problem, pedestrians can be transferred to the other main tunnel through the communication channel, so that the safety coefficient of the pedestrians is greatly increased. Meanwhile, when an accident occurs in one main tunnel, rescue workers can reach the connecting channel from the other main tunnel and then enter a place needing rescue (the main tunnel with the accident) through the connecting channel, so that the aim of quick rescue is fulfilled. The communication channel of the pipe gallery can be used for the pipeline to pass through or be used as a personnel overhaul channel; and the communication channel of the deep buried drainage tunnel can be used as a water delivery tunnel.
Traditional communication channel construction adopts the mode of reinforcing stratum, stopping water, manual work or mining method excavation to go on, has subsidence control complicacy, and the security risk is high, and the efficiency of construction is low, shortcoming with high costs.
For this reason, shield construction methods have been developed in the prior art. And in the construction process, the shield tunneling machine is pushed in the ground and assembled with the prefabricated concrete segments, and finally, a channel structure is formed. Wherein the pushing of the shield machine is pressurized and jacked by a jack, soil excavation is carried out in front of the excavation face through a cutting device of the shield machine, and the slurry is conveyed out of the communication channel through the soil outlet device of the shield tunneling machine. Although the existing shield construction method of the connecting channel solves the technical problems existing in the traditional manual excavation to a certain extent, the existing shield construction method still has the defects that: 1. in the shield construction process of the connecting channel, a full-line large-range freezing method is needed to freeze the stratum of the connecting channel, so that groundwater is prevented from entering the connecting channel in the shield construction process, and soil is carried into the main tunnel when the shield machine is pushed to cut and excavate segments at the receiving ends of the connecting channel and the main tunnel, and a great deal of time is saved for cleaning the main tunnel in the follow-up process. And the method of freezing the stratum by a full-line large-range freezing method is time-consuming and labor-consuming, and has long construction period and high construction cost. 2. The inner space of the main tunnel is smaller, and the operation of disassembling the whole shield machine from the main tunnel is difficult after the shield construction of the connecting channel is finished.
In order to solve the problems, the invention patent application with the publication number of CN107605507A discloses a shield construction receiving structure of a connecting channel and a construction method, wherein a sealing partition plate with the edge extending to be in sealing contact with the inner wall of a main tunnel segment at the receiving end and surrounding a region to be excavated of the main tunnel segment is arranged at the position of the main tunnel corresponding to the receiving end of the connecting channel, so that the sealing partition plate and the main tunnel segment form an isolation bin isolated from the rest space inside the main tunnel. In the construction process of the connecting channel, the shield machine is pushed from the starting end to the receiving end in the ground in a conventional manner and assembles the connecting channel segment, when the shield machine digs through the to-be-dug area of the main tunnel segment at the receiving end, the underground water cannot carry soil into the main tunnel through the receiving end due to the sealing blocking effect of the sealing partition plate, so that the subsequent time spent on cleaning the main tunnel is avoided. After that, the stratum in the receiving end area is frozen locally, and meanwhile, under the condition that the shell (shield shell) of the shield machine is reserved as a primary lining, the rest components, the sealing partition plate, the supporting steel frame and the partition plate support of the shield machine are removed; then carrying out watertight treatment on the joint of the shell and the main tunnel duct piece, and carrying out full-loop secondary grouting on the connecting channel duct piece to form a water-stopping hoop; then constructing two liners connected with the shield segments of the communication channel on the inner side of the shell to form a permanent supporting structure of the receiving end of the communication channel together; and finally, stopping local freezing of the stratum in the receiving end area, and completing shield construction of the communication channel. The shield construction process of the whole connecting channel only needs to carry out local freezing on the stratum in the receiving end area, and the stratum is not required to be frozen by adopting a full-line large-scale freezing method for the whole connecting channel, so that the construction efficiency can be greatly improved, and the construction difficulty and the construction cost are reduced. However, the method has the disadvantage that in the shield construction process of the connecting channel, as the shield machine continuously advances in the soil body and assembles the duct pieces, the soil body continuously forms a shield tail gap due to the fact that the outer diameter of the duct pieces is smaller than the outer diameter of the shield shell of the shield machine (it should be noted that the length of the shield shell is smaller than the length of the connecting channel and is generally only a fraction of the length of the connecting channel, and the soil body which is not supported by the shield shell and the duct piece ring form the shield tail gap after the shield machine is continuously pushed. This requires synchronous grouting during the pushing of the shield machine (it should be noted that the existing shield construction needs synchronous grouting) and filling the formed gaps in time, thereby preventing the surrounding stratum from collapsing and deforming to a greater extent to damage the surrounding surface building. The synchronous grouting requires a large amount of personnel and equipment operation space, and has high construction difficulty and high construction cost; in addition, when grouting is not in place, the problems of collapse of an excavation surface, subsidence of the earth surface and the like can be caused.
Disclosure of Invention
The invention mainly aims to provide a shield construction method of a connecting channel and the connecting channel, aiming at reducing construction difficulty and construction cost and preventing problems of collapse of an excavation surface, subsidence of the earth surface and the like.
In order to achieve the above purpose, the invention provides a shield construction method of a connecting channel, which comprises the following steps:
s1, installing an originating structure and a shield machine at an originating end of one main tunnel corresponding to a communication channel to be constructed, and installing a sealing receiving structure at a receiving end of the other main tunnel corresponding to the communication channel to be constructed;
s2, tunneling the shield machine from the originating end to the receiving end for a preset displacement and assembling the connecting channel segments to form at least one connecting channel segment ring;
s3, enabling the shield machine to pause tunneling, and splicing a section of extension shield shell at the rear end of the shield shell of the shield machine so as to lengthen the shield shell;
s4, enabling the shield machine to continuously tunnel towards a receiving end for preset displacement and continuously assemble the connecting channel segments;
s5, repeating the operation according to the step S3 and the step S4 until tunneling construction of the connecting channel is completed, and forming an lengthened shield shell and a connecting channel segment ring which extend from the originating end to the receiving end respectively;
s6, dismantling the starting structure, the seal receiving structure and other components of the shield machine under the condition that the lengthened shield shell is reserved as a primary lining;
and S7, carrying out watertight treatment on the joint of the two ends of the lengthened shield shell and the two main tunnel segments, and completing shield construction of the communication channel.
The invention also provides a communication channel, which comprises:
the lengthened shield shell extends from the starting end to the receiving end of the connecting channel and comprises a section of shield shell and a plurality of sections of lengthened shield shells, the section of shield shell and the plurality of sections of lengthened shield shells are spliced in sequence, and a sealing structure is arranged at the joint of the two ends of the lengthened shield shell and the two main tunnel segments; and
the connecting channel segment ring is positioned on the inner side of the lengthened shield shell and extends from the starting end to the receiving end of the connecting channel, and is formed by splicing prefabricated connecting channel segments.
The shield shell is gradually spliced and lengthened in the shield construction process and finally reserved in the soil body to form the lengthened shield shell extending from the originating end to the receiving end, so that the soil body corresponding to the whole connecting channel is supported by the lengthened shield shell, the generation of a shield tail gap is avoided, synchronous grouting is not needed in the tunneling process, a large amount of personnel and equipment operation space required by synchronous grouting is saved, and the construction difficulty and the construction cost can be greatly reduced; in addition, the steel lengthened shield shell is reserved in soil body to serve as a primary lining, so that the structural strength of the whole connecting channel can be further improved, and the problems of collapse of an excavation surface, subsidence of the earth surface and the like are prevented.
Drawings
FIG. 1 is a schematic view of a main tunnel with an originating structure and shield tunneling machine installed and at least one negative segment ring assembled, but without tunneling through a main tunnel segment;
FIG. 2 is an enlarged detail view of portion A of FIG. 1;
FIG. 3 is a schematic diagram of a shield tunneling machine tunneling segments of a main tunnel and advancing a positioning shift;
FIG. 4 is a schematic illustration of a shield tunneling machine advanced to a segment that is to be routed through another primary tunnel;
FIG. 5 is a schematic view of a shield tunneling machine tunneling another segment of a main tunnel;
FIG. 6 is a schematic illustration of localized freezing of soil in a receiving end zone;
FIG. 7 is a schematic illustration of the removal of the originating structure, seal receiving structure and remaining components of the shield machine, and watertight treatment of the junction of the two ends of the elongated shield shell and the two main tunnel segments;
fig. 8 is a schematic view of a splice between an elongated shield shell and a shield shell or between adjacent elongated shield shells.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiment of the present invention, directional indications (such as up, down, left, right, front, rear, top, bottom, inner, outer, vertical, lateral, longitudinal, counterclockwise, clockwise, circumferential, radial, axial … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first" or "second" etc. in the embodiments of the present invention, the description of "first" or "second" etc. is only for descriptive purposes, and is not to be construed as indicating or implying 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 at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a shield construction method of a connecting channel.
In the embodiment of the invention, as shown in fig. 1 to 8, the shield construction method of the connecting channel comprises the following steps:
s1, an originating structure 200 and a shield machine 300 are installed at an originating end of one main tunnel 100 corresponding to a communication channel to be constructed, and a sealing receiving structure 500 is installed at a receiving end of the other main tunnel 400 corresponding to the communication channel to be constructed.
Specifically, in step 1, the installation of the originating structure 200 at the originating end of the main tunnel 100 corresponding to the contact channel to be constructed includes the process of installing an originating reaction frame 203 at the side of the main tunnel 100 facing the originating end, installing circumferentially distributed reaction jacks 204 at the side of the originating reaction frame 203 facing the originating end, installing a movable pre-stressing support mechanism at the bottom of the main tunnel 100, and installing a sealing guide steel pipe sleeve 205 at the position of the main tunnel 100 corresponding to the originating end. It should be noted that, the specific structure and installation method of the starting reaction frame 203 (typically, a grid steel frame), the reaction jack 204, and the movable prestress supporting mechanism (typically, including the supporting pulley 202 and the supporting frame 201) may be adopted in the prior art, for example, the corresponding structure and installation manner disclosed in the chinese patent application of the application publication No. CN106948833 may be adopted, and the detailed description of the structure and the operation and installation manner thereof will not be repeated herein.
Specifically, in step 1, the process of installing the seal guiding steel pipe sleeve 205 includes the process of embedding a ring-shaped first steel plate 207 at the periphery of the to-be-excavated area of the segment of the main tunnel 100, disposing a first sealing ring 208 on the first steel plate 207, connecting the seal guiding steel pipe sleeve 205 with the first steel plate 207 and abutting against the first sealing ring 208, and disposing a plurality of support jacks 206 with lower ends abutting against the seal guiding steel pipe sleeve 205 and upper ends abutting against the segment of the main tunnel 100 at the peripheral direction of the outer wall of the seal guiding steel pipe sleeve 205. The first sealing ring 208 may enable the joint of the sealing guiding steel pipe sleeve 205 and the main tunnel 100 to form watertight, and the supporting jack 206 may enable the sealing guiding steel pipe sleeve 205 to keep stable, so that the inner diameter of the sealing guiding steel pipe sleeve 205 is adapted to the outer diameter of the shield shell 11 of the shield machine 300, so as to guide the tunneling of the shield machine 300 and prevent the underground water from carrying soil into the main tunnel 100 through the sealing guiding steel pipe sleeve 205 in the tunneling process of the shield machine 300 from the originating end to the receiving end. Further, the process of installing the sealing guide steel pipe sleeve 205 further includes providing a plurality of first oil holes 2051 penetrating through the inner wall surface of the sealing guide steel pipe sleeve 205 in the circumferential direction of the outer peripheral wall of the sealing guide steel pipe sleeve 205, installing a sealing brush 4 (or brush type seal) at a position of the inner wall surface of the sealing guide steel pipe sleeve 205 behind the first oil holes 2051, and injecting lubricating oil between the inner wall of the sealing guide steel pipe sleeve 205 and the outer wall of the shield shell 11 through the first oil holes 2051 during the tunneling process of the shield machine 300, so as to perform sealing and lubricating functions, and the sealing brush 4 can prevent the lubricating oil from leaking outwards when the shield machine 300 is propelled. The first oil holes 2051 are preferably six and uniformly distributed in the circumferential direction.
The installation of the shield machine 300 mainly comprises the installation of a cutter head cutter system, a soil bin, a bearing, a motor, a segment assembly system, a shield shell 11 and other components, and specifically how to install the components is the prior art, and no description is repeated here.
Specifically, there are various ways to install the seal receiving structure 500 at the receiving end of the other main tunnel 400 corresponding to the communication channel to be constructed, and in an embodiment, the receiving structure in the chinese patent application with application publication number of CN107605507a may be adopted. For example, the method comprises the steps that a sealing partition plate 501 with the edge extending to be in sealing contact with the pipe piece of the other main tunnel 400 and sealing and surrounding the to-be-dug area of the pipe piece of the other main tunnel 400 is arranged inside the other main tunnel 400, a sealed isolation bin 502 is formed by enclosing the sealing partition plate 501 and the to-be-dug area of the pipe piece of the other main tunnel 400, slurry is filled in the isolation bin 502, meanwhile, a supporting steel frame 503 is fixedly arranged on the side, opposite to the to-be-dug area, of the pipe wall of the other main tunnel 400, and a partition plate support 504 (generally a jack, a cylinder or a hydraulic cylinder and the like) is abutted between the supporting steel frame 503 and the sealing partition plate 501. After the shield tunneling machine 300 digs through the segment of the other main tunnel 400, the underground water cannot carry soil into the other main tunnel 400 through the receiving end due to the sealing blocking effect of the sealing partition plate 501, so that a great deal of time is saved for cleaning the other main tunnel 400. It will be appreciated that the slurry is primarily pressure maintaining and protective within the isolation bin 502. Specifically, the sealing separator 501 includes a metal plate 5011 with an edge extending to be sealed against another segment of the main tunnel 400, and a separator 5012 fixed to a side opposite to the to-be-excavated area of the metal plate 5011, where the separator 5012 may be made of wood or plastic, and when the shield machine 300 is pushed too much, the separator 5012 may be cut by a cutterhead portion of the shield machine 300 without damage to the cutterhead. Of course, the manner of installing the seal receiving structure 500 at the receiving end of the other main tunnel 400 corresponding to the to-be-constructed communication channel may also adopt an embodiment corresponding to the chinese patent application with application publication No. CN106948833, or adopt other existing embodiments.
S2, tunneling the shield machine 300 from the originating end to the receiving end for a preset displacement and assembling the connecting channel segments to form at least one connecting channel segment ring.
Specifically, before tunneling the shield machine 300 from the originating end to the receiving end, the method further comprises assembling a plurality of sections of negative segment rings 3 inside the shield shell 11, and abutting the counter-force jack 204 against the rear end of the negative segment rings 3 to provide a supporting counter-force for the shield machine jack 301 with the rear end abutting against the front end of the negative segment rings 3, so that the shield machine 300 can tunnel forward. It should be noted that, the negative segment ring 3 refers to a segment ring located outside the connecting channel, and is abutted against the counter jack 204 during the shield construction process, so as to provide a supporting counter force for the tunneling of the shield machine 300. And after the shield construction is finished, the negative segment ring 3 is required to be dismantled.
It will be appreciated that the predetermined displacement should generally be less than the length of the shield 11, with the shield 11 being partially outside the communication path, which facilitates subsequent assembly of the elongate shield 12. It should be noted that, how the shield tunneling machine 300 assembles the connecting channel segments in the tunneling process is the prior art, and no description is repeated here.
S3, enabling the shield machine 300 to pause tunneling, and splicing a section of extension shield shell 12 at the rear end of the shield shell 11 of the shield machine 300 so as to lengthen the shield shell 11.
Specifically, the process of assembling a section of extension shield shell 12 at the rear end of shield shell 11 of shield machine 300 includes the processes of hanging extension shield shell 12 opposite to shield shell 11 located in front of it, and applying a pushing force to push extension shield shell 12 forward until bolt 5 located at the front end wall of it is pushed into a receiving hole located at the rear end wall of shield shell 11, so that extension shield shell 12 is butted with shield shell 11, and welding the junction of extension shield shell 12 and shield shell 11. Further, before assembling, the process of providing the elastic sealing gasket 7 on the front end wall of the extension shield shell 12 and/or the rear end wall of the shield shell 11 is also included to play a role in seepage prevention.
More specifically, the front end wall of the extension shield shell 12 is provided with a screw hole 112 and screwed with the bolt 5, the position of the shield shell 11 opposite to the screw hole 112 is provided with the connecting hole, an elastic lock piece 6 is fixedly arranged in the connecting hole, the lock piece 6 is provided with a clamping hole with the diameter smaller than the outer diameter of the cap part 51 of the bolt 5, and after the cap part 51 of the bolt 5 is extruded through the clamping hole, the hook is clamped on the front end wall of the lock piece 6 so as to fixedly connect the extension shield shell 12 and the shield shell 11. Further, the peripheral wall of the portion of the shank portion of the bolt 5 outside the screw hole 112 is provided with teeth 52 extending outwards, the wall of the clamping hole is formed with a pawl 61, and after the cap portion 51 of the bolt 5 is pushed through the clamping hole, the teeth 52 are clamped into the pawl 61.
It will be appreciated that before a section of extension shield shell 12 is assembled at the rear end of the shield shell 11 of the shield machine 300, the method further comprises the step of removing at least one section of negative segment ring 3 close to the counter-force jack 204 to vacate the space for assembling the extension shield shell 12, and after the extension shield shell 12 is assembled, the piston rod of the counter-force jack 204 can be extended to be propped against the undetached negative segment ring 3 to continuously provide supporting counter-force for forward tunneling of the shield machine 300. The number of the counter jacks 204 is set according to the number of segments of a segment ring 3, for example, six counter jacks 204 are provided, and each counter jack 204 corresponds to a segment of a segment ring 3.
S4, the shield tunneling machine 300 is enabled to continuously tunnel towards the receiving end for preset displacement and continuously assemble the connecting channel segments.
S5, repeating the operation according to the step S3 and the step S4 until tunneling construction of the connecting channel is completed, and forming an lengthened shield shell 1 and a connecting channel segment ring 2 which extend from the originating end to the receiving end respectively;
specifically, the connecting channel segment of the connecting channel segment ring 2 is basically a concrete segment, but in order to improve the structural strength at the receiving end of the connecting channel, the connecting channel segment of the connecting channel segment ring 21 of the last section (i.e. the connecting channel segment ring at the receiving end) is a steel segment and can be welded and fixedly connected with the shield shell 11.
As to how many segments of the extension shield 12 are ultimately spliced, depending on the length of the connection channel and extension shield 12. After the tunneling construction is completed, if the two ends of the lengthened shield shell 1 extend out of the connecting channel too much, the too much extending part needs to be cut off. The splicing manner between the adjacent extension shield shells 12 is identical to the splicing manner of the extension shield shells 12 and 11, and will not be described in detail here.
S6, removing the originating structure 200, the seal receiving structure 500 and the rest components of the shield machine 300 in parallel under the condition that the lengthened shield shell 1 is reserved as a primary lining.
S7, watertight treatment (namely, a sealing structure is arranged) is carried out on the joint of the two ends of the lengthened shield shell 1 and the duct pieces of the two main tunnels 100 and 400, and shield construction of a connecting channel is completed.
Further, the method for constructing the shield of the communication passage of the present invention further comprises the steps of locally freezing the soil body 600 in the receiving end region before the originating structure 200, the seal receiving structure 500 and the remaining components of the shield machine 300 are removed, and after watertight treating the joints between the two ends of the elongated shield shell 1 and the segments of the two main tunnels 100 and 400, terminating the process of locally freezing the soil body in the receiving end region, wherein the locally freezing can locally strengthen the soil body.
Further, the process of forming a second oil injection hole 111 and a third oil injection hole (not shown) in the shield shell 11, the extension shield shell 12 and the connecting channel segment, and injecting lubricating oil between the shield shell 11, the extension shield shell 12 and the connecting channel segment through the second oil injection hole 111 and the third oil injection hole is further included, so as to perform a lubrication function and reduce friction resistance during tunneling of the shield machine 300.
It should be noted that, in order to reduce the cutting resistance of the shield tunneling machine 300, at least the region to be excavated of the segments of the two main tunnels 100, 400 adopts a machinable composite segment, and the specific structure of the machinable composite segment is the prior art, which is not described herein.
Further, before the sealing receiving structure 500 is installed at the receiving end of the other main tunnel 400 corresponding to the communication channel to be constructed, the process further includes embedding a second steel plate 505 with a ring shape around the to-be-excavated area of the segment of the other main tunnel 400, and fixing a second sealing ring 506 with an inner diameter adapted to the outer diameter of the shield shell 11 on the second steel plate 505, so that when the shield machine 300 excavates the to-be-excavated area of the segment of the other main tunnel 400, the second sealing ring 506 is abutted against the seal of the shield shell 11 to form watertight.
According to the invention, the shield shell 11 is gradually spliced and lengthened in the shield construction process and finally reserved in soil, so that the lengthened shield shell 1 extending from the originating end to the receiving end is formed, the soil corresponding to the whole connecting channel is supported by the lengthened shield shell 1, and the generation of a shield tail gap is avoided, so that synchronous grouting is not required in the tunneling process, a large amount of personnel and equipment operation space required by synchronous grouting is saved, and the construction difficulty and the construction cost can be greatly reduced; in addition, the steel lengthened shield shell 1 is reserved in soil body to serve as a primary lining, so that the structural strength of the whole connecting channel can be further improved, and the problems of collapse of an excavation surface, subsidence of the earth surface and the like are prevented.
The invention also proposes a communication channel which,
in the embodiment of the invention, as shown in fig. 1 to 8, the communication channel comprises an elongated shield shell 1 and a communication channel segment ring 2.
The lengthened shield shell 1 extends from the originating end to the receiving end of the connecting channel and comprises a shield shell 11 and a plurality of sections of lengthened shield shells 12, the shield shell 11 and the plurality of sections of lengthened shield shells 12 are spliced in sequence, and a sealing structure is arranged at the joint of the two ends of the lengthened shield shell 1 and two main tunnel segments; the connecting channel segment ring 2 is positioned on the inner side of the lengthened shield shell 1 and extends from the starting end to the receiving end of the connecting channel, and is formed by splicing prefabricated connecting channel segments.
In the embodiment of the invention, the extension shield shell 12 and the shield shell 11 and the adjacent extension shield shells 12 are welded and fixed. In order to facilitate welding and improve the connection strength, the front end wall of the extension shield shell 12 is provided with a screw hole 112 and is screwed with a bolt 5, the rear end walls of the extension shield shell 12 and the shield shell 11 are provided with connecting holes corresponding to the bolt 5, an elastic lock piece 6 is fixedly arranged in each connecting hole, the lock piece 6 is provided with a clamping hole with the diameter smaller than the outer diameter of a cap part 51 of the bolt 5, and after the cap part 51 of the bolt 5 is extruded through the clamping hole, a hook is clamped on the front end wall of the lock piece 6 so as to butt-joint and fasten the extension shield shell 12, the shield shell 11 and the adjacent extension shield shell 12, thereby facilitating subsequent welding. Specifically, the peripheral wall of the portion of the shank portion of the bolt 5 outside the screw hole 112 is provided with teeth 52 extending outwards, the wall of the receiving hole is formed with inverted teeth 61, and after the cap portion 51 of the bolt 5 is pushed through the clamping hole, the teeth 52 are clamped into the inverted teeth 61, so that the connection strength is further improved.
Further, the front end wall of the extension shield 12 and/or the rear end wall of the shield 11 is provided with an elastic sealing gasket 7 for an impermeable effect.
Further, the position of the front end wall of the elastic lock 6 is also provided with a rubber ring extending out of the connecting hole, and after the extension shield 12 is spliced, the rubber ring is elastically abutted between the corresponding extension shield 12 and the shield 11 and the adjacent extension shield 12 to further prevent seepage.
The connecting channel segment is basically a concrete segment, but in order to improve the structural strength at the receiving end of the connecting channel, the segment of the last connecting channel segment ring 21 (i.e., the connecting channel segment ring at the receiving end) is a steel segment.
The periphery of the region to be excavated of the segment of the other main tunnel 400 is embedded with a ring-shaped second steel plate 505, a second sealing ring 506 with the inner diameter matched with the outer diameter of the shield shell 11 is fixedly arranged on the second steel plate 505, and when the shield machine 300 excavates the region to be excavated of the segment of the other main tunnel 400, the second sealing ring 506 is abutted against the seal of the shield shell 11.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (9)
1. The shield construction method of the connecting channel is characterized by comprising the following steps:
s1, installing an originating structure and a shield machine at an originating end of one main tunnel corresponding to a communication channel to be constructed, and installing a sealing receiving structure at a receiving end of the other main tunnel corresponding to the communication channel to be constructed;
s2, tunneling the shield machine from the originating end to the receiving end for a preset displacement and assembling the connecting channel segments to form at least one connecting channel segment ring;
s3, enabling the shield machine to pause tunneling, assembling a section of extension shield shell at the rear end of the shield shell of the shield machine so as to lengthen the shield shell, and specifically comprising the following steps: the process of splicing a section of extension shield shell at the rear end of the shield shell of the shield machine comprises the steps of hanging the extension shield shell to be opposite to the shield shell positioned in front of the extension shield shell, applying thrust to push the extension shield shell forward until a bolt arranged at the front end wall of the extension shield shell is jacked into a joint hole positioned at the rear end wall of the shield shell, enabling the extension shield shell to be in butt joint with the shield shell, and welding the joint of the extension shield shell and the shield shell;
s4, enabling the shield machine to continuously tunnel towards a receiving end for preset displacement and continuously assemble the connecting channel segments;
s5, repeating the operation according to the step S3 and the step S4 until tunneling construction of the connecting channel is completed, and forming an lengthened shield shell and a connecting channel segment ring which extend from the originating end to the receiving end respectively;
s6, dismantling the starting structure, the seal receiving structure and other components of the shield machine under the condition that the lengthened shield shell is reserved as a primary lining;
and S7, carrying out watertight treatment on the joint of the two ends of the lengthened shield shell and the two main tunnel segments, and completing shield construction of the communication channel.
2. The method for constructing the shield of the communication channel according to claim 1, wherein: in step 1, the installation of the originating structure at the originating end of a main tunnel corresponding to the contact channel to be constructed includes the processes of installing an originating reaction frame at one side of the main tunnel facing the originating end, installing circumferentially distributed counter-force jacks at one side of the originating reaction frame facing the originating end, installing a movable prestress supporting mechanism at the bottom of the main tunnel, and installing a sealing guide steel pipe sleeve at the position of the main tunnel corresponding to the originating end; the process of installing the sealing guide steel pipe sleeve comprises the steps of embedding a first annular steel plate at the periphery of a to-be-dug area of a segment of a main tunnel, arranging a first sealing ring on the first steel plate, connecting the sealing guide steel pipe sleeve with the first steel plate and propping against the first sealing ring, and circumferentially arranging a plurality of lower ends propping against the sealing guide steel pipe sleeve on the outer wall of the sealing guide steel pipe sleeve, wherein the upper ends of the support jacks propping against the segment of the main tunnel.
3. The communication tunnel shield construction method according to claim 2, wherein: the process of installing the sealing guide steel pipe sleeve further comprises the steps of circumferentially arranging a plurality of first oil holes penetrating through the inner wall surface of the sealing guide steel pipe sleeve, installing a sealing brush at the position, located behind the first oil holes, of the inner wall surface of the sealing guide steel pipe sleeve, and then injecting lubricating oil between the inner wall of the sealing guide steel pipe sleeve and the outer wall of the shield shell through the first oil holes in the tunneling process of the shield machine.
4. The method for constructing the shield of the communication channel according to claim 1, wherein: the shield machine further comprises a process of assembling a plurality of sections of negative segment rings on the inner side of the shield shell before tunneling from the originating end to the receiving end, and propping the counter-force jack against the rear end of the negative segment rings to provide supporting counter-force for the shield machine jack with the rear end propped against the front end of the negative segment rings so that the shield machine can tunnel forwards.
5. The method for constructing the shield of the connecting passage according to claim 4, wherein: before the rear end of the shield shell of the shield machine is assembled with a section of extension shield shell, the method further comprises the step of removing at least one section of negative segment ring close to the counter-force jack to vacate a space for assembling the extension shield shell, and after the extension shield shell is assembled, a piston rod of the counter-force jack extends out to be propped against the undetached negative segment ring, so that the process of providing supporting counter-force for forward tunneling of the shield machine is continued.
6. The shield construction method for a communication passage according to any one of claims 1 to 5, characterized in that: before the sealing receiving structure is installed at the receiving end of the connecting channel to be constructed corresponding to the other main tunnel, the process of embedding a second annular steel plate at the periphery of the to-be-dug area of the segment of the other main tunnel, and fixedly arranging a second sealing ring with the inner diameter being matched with the outer diameter of the shield shell on the second steel plate.
7. A communication tunnel using the communication tunnel shield construction method according to any one of claims 1 to 6, comprising:
the lengthened shield shell extends from the starting end to the receiving end of the connecting channel and comprises a section of shield shell and a plurality of sections of lengthened shield shells, the section of shield shell and the plurality of sections of lengthened shield shells are spliced in sequence, and a sealing structure is arranged at the joint of the two ends of the lengthened shield shell and the two main tunnel segments; and
the connecting channel segment ring is positioned on the inner side of the lengthened shield shell and extends from the starting end to the receiving end of the connecting channel, and is formed by splicing prefabricated connecting channel segments.
8. A communication tunnel according to claim 7, using the communication tunnel shield construction method according to any one of claims 1 to 6, characterized in that: the bolt hole is formed in the front end wall of the extension shield shell, the bolt is screwed to the front end wall of the extension shield shell, a connecting hole corresponding to the bolt is formed in the rear end wall of the extension shield shell and the rear end wall of the shield shell, an elastic lock piece is fixedly arranged in the connecting hole, a clamping hole with the diameter smaller than the outer diameter of the cap portion of the bolt is formed in the lock piece, after the cap portion of the bolt is extruded through the clamping hole, the hook is clamped on the front end wall of the lock piece, an elastic sealing gasket is arranged on the front end wall of the extension shield shell and/or the rear end wall of the shield shell, and a connecting channel segment of the last section of connecting channel segment ring adopts a steel segment.
9. A communication tunnel according to claim 8, using the communication tunnel shield construction method according to any one of claims 1 to 6, characterized in that: the circumference wall of the part of the bolt part outside the screw hole is provided with teeth extending outwards, the hole wall of the connecting hole is provided with inverted teeth, after the cap part of the bolt is extruded through the clamping hole, the teeth are clamped into the inverted teeth, the periphery of the region to be dug through of the segment of the other main tunnel is embedded with a second annular steel plate, a second sealing ring with the inner diameter being matched with the outer diameter of the shield shell is fixedly arranged on the second steel plate, and when the shield machine dug through the region to be dug through of the segment of the other main tunnel, the second sealing ring is abutted against the seal of the shield shell.
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| CN201810537259.8A CN108590695B (en) | 2018-05-30 | 2018-05-30 | Communication channel shield construction method and communication channel |
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| CN109763827B (en) * | 2019-03-29 | 2019-12-10 | 中山大学 | Shaft shield construction method and shaft shield machine |
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| CN112696201A (en) * | 2020-12-28 | 2021-04-23 | 上海市基础工程集团有限公司 | Shield tunnel connecting channel steel pipe sheet tapping and hole sealing construction method |
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| CN113622948B (en) * | 2021-07-23 | 2023-08-18 | 北京市政建设集团有限责任公司 | Shield tunnel connecting channel pipeline device |
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Inventor after: Huang Linchong Inventor after: Liang Yu Inventor before: Liang Yu Inventor before: Huang Linchong |