CN217681731U - Air shaft duct for breaking shield tunnel segment mine construction interval - Google Patents

Abstract

A mine method construction interval air shaft air duct for breaking shield tunnel segments comprises a left line, a right line and an existing tunnel, and further comprises an underground layer and an underground second layer of the air shaft air duct which are constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel to the end wall plug of the air duct of the air shaft and is provided with an end wall A; the underground second layer transversely extends to the outer edge of the shield tunnel from the position below the top of the tunnel; a No. 1 vertical shaft is arranged between the left and right tunnels, and a No. 2 vertical shaft is arranged on the outer side of the right tunnel; a No. 1 vertical shaft hole and a No. 2 vertical shaft hole are formed in the middle partition plate of the underground layer; the underground first floor and the underground second floor are communicated with the left line tunnel, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft. The tunnel segment is broken and applied as the air duct of the air shaft after the shield passes through in advance.

Description

Air shaft duct for breaking shield tunnel segment mine construction interval

Technical Field

The utility model relates to a subway engineering construction technical field specifically is a break shield tunnel section of jurisdiction mine method interval air shaft wind channel of being under construction.

Background

Subway construction is used as a large long-distance linear engineering project, the construction period risk is gradually prominent in recent years, and particularly, in recent years, many long-distance interval tunnels appear in the construction of long and large express lines. In order to meet the needs of subway operation and evacuation, interval air shafts are often added to long-distance tunnels, if the interval air shafts are constructed and then shield tunneling is carried out, the delay of the construction period of the interval air shafts often influences subsequent shield construction, and the total construction period is prolonged.

In addition, similar situations also exist in subway stations, a common subway is located in a region with bustling commercial and heavy ground traffic, the construction period is greatly limited by the removal progress, and after a tunnel is opened, the problems of station adding, station reducing, station slow building and the like are frequently solved in the later period.

Therefore, the combined application of the underground tunnel excavation construction methods is urgently needed, the design scheme and the construction technical research for flexibly solving the problems that the shield firstly passes through and the tunnel segment is broken in the later period are needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a break apart shield tunnel section of jurisdiction mine method interval air shaft wind channel of being under construction, its aim at solve earlier shield construct cross station, break apart the technical problem in the interval air shaft wind channel of shield tunnel section of jurisdiction construction after. The method is used for solving the technical problems that shield construction progress is restricted and the construction period of a node cannot be met due to the fact that shield station passing is carried out after the construction of the air duct of the air shaft is finished in the prior art, and can be used as a construction method when a temporary air shaft or an interval substation is additionally arranged after a shield interval passes through.

The technical scheme of the utility model as follows:

the utility model relates to a break apart section wind shaft wind channel that shield tunnel section of jurisdiction mine method was under construction, including existing tunnel, existing tunnel includes left side line tunnel, right side line tunnel, its characterized in that still includes the wind shaft wind channel underground one deck 1, the second floor 2 that the pilot tunnel step method was executed; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for preliminary bracing until the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the underground second layer transversely extends to the outer edge of the shield tunnel from the position below the top of the tunnel and is constructed for primary support; a No. 1 vertical shaft is arranged between the left and right tunnels, a No. 2 vertical shaft is arranged on the outer side of the right tunnel, and primary support is constructed; the underground first floor (1) and the underground second floor (2) are communicated with the left line, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.

The interval air shaft air duct for the mining method for breaking the shield tunnel segments is characterized in that two lining structures are arranged in the underground first layer, the underground second layer, the left line tunnel, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.

The technical characteristics of the utility model are that: after the upper-layer pilot tunnel of the air duct crosses over the shield tunnel, primary support and secondary support structures on two sides of the shield are hung upside down under the protection of primary support and secondary support of the upper-layer air duct, then primary support structures on the side wall of the vertical shaft are broken, segments of the shield are broken, and finally pouring of the secondary support structures of the air duct is completed.

The effect of the utility model

The method effectively solves the contradiction between the construction lag of the air shaft air duct and the restricted shield construction progress, can avoid the risks of multiple starting and receiving of the shield when passing through the air shaft air duct, and has the advantages of reasonable procedures, safety, reliability, capability of effectively shortening the construction period and the like. Meanwhile, the method for constructing the air shaft air duct can solve the problem that the shield passes through in advance and then breaks away tunnel segments and can be applied to projects of adding stations, reducing stations, building stations slowly and needing temporary air shafts and the like.

Drawings

FIG. 1 is a schematic view of the air shaft duct branch pilot tunnel excavation lateral direction of the utility model,

fig. 2 (1) and 2 (2) are longitudinal schematic views of the air shaft duct branch pilot tunnel excavation of the present invention, and fig. 2 (2) is a cross-sectional view of fig. 2 (1) from 1-1;

fig. 3 (1) and 3 (2) are schematic structural diagrams of the underground second-layer construction of the underground first layer of the air shaft duct of the present invention, and fig. 3 (2) is a sectional view of fig. 3 (1) from 1 to 1;

fig. 4 (1) and fig. 4 (2) are schematic construction diagrams of the vertical shaft 1 and the vertical shaft 2 of the air shaft duct of the utility model,

FIG. 4 (2) is a sectional view taken along line 1-1 in FIG. 4 (1);

fig. 5 (1) and 5 (2) are schematic structural diagrams of a second lining for the construction of a number 1 shaft and a number 2 shaft of the air duct of the air shaft of the present invention, and fig. 5 (2) is a sectional view of fig. 5 (1) from 1 to 1;

FIG. 6 is a schematic view of the construction of removing shield segments from the air duct of the air shaft of the present invention,

FIG. 7 is a schematic view of the construction of the outer side wall near the air soil body and the back cover of the shield segment removed from the air shaft duct of the utility model,

FIG. 8 is a schematic view of a construction secondary lining structure after shield segments are removed from the air duct of the air shaft of the present invention,

FIG. 9 is a flow chart of the specific operation steps for removing the duct piece according to the present invention,

FIG. 10 is a schematic view of the arrangement of plate openings and the arrangement of section steel beams in the air duct of the air shaft of the present invention,

figure 11 is a schematic view of segment hoisting of the utility model,

figure 12 is a schematic diagram of the inner support of the steel ring of the present invention,

FIG. 13 is a schematic view of the grouting reinforcement in the shield tunnel of the present invention,

figure 14 is a schematic cross-sectional view of the auxiliary grouting in the shaft of the present invention,

FIG. 15 is a schematic plan view of an auxiliary grouting in a shaft according to the present invention;

fig. 16 is a schematic view of the air shaft of the present invention;

description of the figure numbering:

an underground first layer 1, an underground second layer 2, a tunnel 3, an underground first layer rail traveling region outer side 4, an underground second layer rail traveling region outer side 5, an underground first layer rail traveling region 6, a rail traveling region underground second layer bottom plate 7, a wind well air duct side wall 8, a left line tunnel vault hoisting port 9, a No. 1 shaft hole 10, a right line tunnel vault hoisting port 11 which is a permanent piston wind hole, a No. 2 shaft hole 12, an outer side wall upper part 121, a scaffold 13, two backing plates 14, a side wall upper part 15, a steel ring inner support 16, a H25 b type steel longitudinal connecting beam 17, a movable type steel ring support 18, a wind well air duct side wall outer side adjacent hollow soil body 19, a bottom sealing 20, a ring beam 21, an I32a type steel beam 22, a vertical support 23, a transverse support 24, a middle first ring segment (1), a second ring segment (2), a third ring segment (3), a fourth ring segment (4), a fifth ring segment (5), a sixth ring segment (6), a seventh ring segment (7), an eighth ring segment (8), a ninth ring segment (9);

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

Referring to fig. 16, the interval air shaft duct for breaking the shield tunnel segment mine method construction of the present invention includes an existing tunnel, which includes a left-line tunnel and a right-line tunnel, and further includes an underground first layer 1 and an underground second layer 2 of the air shaft duct constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for primary support till the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the second underground layer is transversely plugged to the outer edge of the adjacent shield tunnel from the position below the top of the tunnel, and is provided with a second end wall B for primary support construction; a No. 1 vertical shaft 100 is arranged between the left and right line tunnels, a No. 2 vertical shaft 120 is arranged on the outer side edge of the tunnel far away from the end wall II B, and primary support is constructed; a No. 1 vertical shaft hole 10 and a No. 2 vertical shaft hole 12 are formed in the middle partition plate of the underground layer 1, and are shown in a figure 5 (1); and in the range of the air shaft air duct, the primary support of the second end wall B, the left-line tunnel segment, the primary support of the No. 1 shaft side wall, the right-line tunnel segment and the primary support of the No. 2 shaft side wall are synchronously broken, so that the air shaft air duct is communicated with the left-line tunnel, the right-line tunnel, the No. 1 shaft and the No. 2 shaft.

A break interval air shaft wind channel of shield tunnel section of jurisdiction mine method construction, underground one deck 1, two layers of 2, left side line tunnel section of jurisdiction and right side line tunnel section of jurisdiction broken scope, no. 1 shaft, no. 2 shaft set up two lining structures.

The utility model discloses a construction method for breaking shield tunnel section of jurisdiction mine method construction interval air shaft wind channel mainly includes following step:

(1) Grouting advanced deep holes to reinforce the vault soil body 101 of the air shaft air duct, and excavating the air shaft air duct in a layered and segmented manner according to the section size and the engineering conditions of the air shaft air duct after a reinforcing effect is achieved;

as shown in fig. 1, the following description will be made in detail by taking four layers of 12-layer pilot tunnel construction air shaft ducts as an example, excavating all chambers and constructing primary supports in sequence by a pilot tunnel numbering step method, wherein the step length is 3-5 m, locking anchor pipes are constructed in time, and the longitudinal excavation lengths of all chambers are staggered by no less than 6m;

as shown in fig. 2 (1) and 2 (2), the upper two layers of pilot tunnels (No. 1-6 chambers) are constructed and constructed for primary support from the top of the tunnel 3, transversely span the existing tunnel, are excavated to the air shaft air duct end wall for plugging, are constructed as an end wall A, and are excavated into an underground layer 1; constructing the lower two layers of pilot tunnels (No. 7-12) from the top of the tunnel, constructing primary support, transversely excavating to the outer edge of the adjacent shield tunnel for plugging, constructing a second end wall B, and excavating into a second underground layer 2;

(2) As shown in fig. 3 (1) and 3 (2), waterproof layers and two lining structures on the outer side 4 of the underground one-layer rail area of the air shaft air duct, the underground one-layer rail area 6 and the outer side 5 of the underground two-layer rail area are constructed, only structures of side walls of the underground two-layer rail area of the air shaft air duct and an underground two-layer bottom plate 7 of the rail area are reserved without construction so as to be convenient for construction and removal of duct pieces, and a shaft hole 10 No. 1 and a shaft hole 12 No. 2 are reserved on a middle plate of the underground one-layer rail area 6, and a left-line tunnel vault lifting port 9 and a right-line tunnel vault lifting port 11 are reserved respectively and are also used as permanent piston air holes; the No. 1 vertical shaft is positioned between the left tunnel and the right tunnel, and the No. 2 vertical shaft is positioned on the side edge of the right tunnel; the left line tunnel vault hoisting port 9 and the right line tunnel vault hoisting port 11 are positioned at the tops of the left line tunnel and the right line tunnel;

(3) As shown in fig. 4 (1) and 4 (2); the temporary inverted arches of air shaft air ducts 2, 4 and 6 pilot tunnels in the opening ranges of the No. 1 vertical shaft and the No. 2 vertical shaft are broken in a partitioning mode, the vertical shaft is excavated by hanging a shaft wall upside down, vertical shaft grids are erected in time, longitudinal tie bars are connected, and profile steel supports are erected;

the vertical excavation step distance is a grid distance, a profile steel support vertical distance and a concrete grid distance; excavating to the bottom of the vertical shaft, and sealing the bottom in time; constructing according to the construction sequence of the No. 1 vertical shaft and the No. 2 vertical shaft, and carrying out deep hole grouting reinforcement on two sides of the vertical shaft in time in the vertical shaft construction process;

(4) Dismantling two steel supports at the lower part in the shaft, laying a waterproof layer, binding reinforcing steel bars, and pouring two substrate plates 14 and partial side walls; after the second lining of the bottom plate reaches 80% of the design strength, erecting a scaffold, locally breaking a vertical shaft temporary intermediate wall, laying a waterproof layer, binding reinforcing steel bars, erecting a formwork, pouring the upper part 121 of the outer side wall and connecting the middle floor, and the upper part 15 of the side wall in the width direction of the air duct of the air shaft; as shown in fig. 5 (1) and 5 (2).

(V): removing shield segments in the air duct of the air shaft;

as shown in fig. 6, after the second lining construction of the No. 1 vertical shaft and the No. 2 vertical shaft in the air shaft duct is finished, firstly, tunnel duct pieces between left line areas are removed, a movable steel ring support 18 is constructed on a first ring duct piece which is removed in advance, and the first ring duct piece (1) in the middle is removed firstly; moving the movable steel ring support to the next ring of pre-removed pipe pieces, symmetrically and gradually removing the pipe pieces on two sides of the first ring of pipe pieces until reaching the side wall 8 of the air duct of the air shaft; the end wall II B and the primary support of the side wall of the vertical shaft are gradually broken along with the pipe sheet of the left line tunnel, and the left line tunnel is communicated with the air duct of the air shaft and the No. 1 vertical shaft;

(VI): constructing a secondary lining structure of the air duct of the air shaft in the segment-broken range; as shown in figures 7 and 8 of the drawings,

(1) Hanging double-layer reinforcing mesh sheets, spraying C20 concrete to close an air body 19 on the outer side of the air duct side wall of the air shaft, excavating a removed segment bottom soil body to a structural bottom plate, and sealing a bottom 20 by adopting C20 sprayed concrete and I22 a steel support;

(2) Constructing a waterproof layer of a bottom plate, binding reinforcing steel bars, erecting a scaffold in the segment-broken range, erecting a formwork, pouring a secondary lining structure of the bottom plate (in an air-facing soil body 19 and a back cover 20), and constructing and finishing a side wall structure (8) of an air duct of the air shaft and a post-cast ring beam 21;

and after the left line pipe piece is removed, removing the tunnel pipe piece between the right line areas according to the same method, constructing a secondary lining structure of the air shaft air channel in the range of the removed pipe piece, and communicating the air shaft air channel with the left line tunnel, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft to form the air shaft air channel. As shown in fig. 5 (1), 5 (2), and 8. The bottom of the air duct of the air shaft, the shaft 1 and the shaft bottom of the shaft 2 are deeper than the tunnel.

The specific embodiment of duct piece removal is as follows:

the removal of the tube sheets is mainly carried out in the following steps, see the flow chart of fig. 9.

(1) Construction preparation: as shown in fig. 10;

(1) erecting a steel frame on a middle plate of an air duct of the air shaft, respectively laying 2I 32a steel beams 22 on a left tunnel vault hoisting port 9 and a right tunnel vault hoisting port 11, and respectively fixing 2 chain blocks of 10t on different steel beams so as to facilitate hoisting and outward transportation of duct pieces and materials;

(2) the assembly of the movable steel ring support 18 is shown in figure 11; the movable steel ring is assembled at the position of the duct piece to be dismantled, the jacks which are radially and symmetrically distributed are arranged in a hydraulic support system of the movable steel ring, so that supporting stress can be provided for the duct piece for dismantling the connecting bolt in the early stage, and the jacks which independently work can provide operation space for the duct piece to be dismantled through unloading a hydraulic rod and provide continuous supporting stress for the duct piece to be dismantled in the later stage when the duct piece is dismantled, so that the overall stability of the duct piece to be dismantled of the dismantling ring is ensured;

(2) Segment removal as shown in fig. 6, 9, and 11:

(1) firstly, removing a middle segment, namely removing a segment (1) of a 1 st ring, erecting a movable steel support to the segment of the 1 st ring, and providing support stress for the segment through a hydraulic loading system of the movable steel support;

(2) punching a grouting hole of a duct piece at the vault position, installing a duct piece hoisting bolt on the grouting hole of the duct piece to be dismantled, and installing the bolt on a lifting rope of a chain block; completely removing the longitudinal connecting bolts above the center line of the pipe piece between the ring 1 and the rings 2 and 3;

(3) cutting a 1 st ring wedge-shaped K segment of the vault by using a water drill or a wire saw, making a circle of cutting seams on the periphery of the K segment, removing the longitudinal jacking force of the segment to separate the segment from peripheral segments, and removing the K segment; in the dismantling process, jacks on two sides of the movable steel support K are gradually unloaded, a lifting rope of the chain block is slowly tensioned, and the chain block is transported to the outside of the hole through a reserved lifting port of the air shaft air duct;

(4) then, removing adjacent segment, installing segment hoisting bolts in the segment bolt holes to be removed, and removing the bolts connected with the adjacent segment; slowly tensioning the chain block, symmetrically and sectionally unloading the hydraulic jack of the movable steel support, and lifting out the pipe piece; removing the pipe piece within 180-degree arch top of the 1 st ring pipe piece;

(5) in the same way, the 1 st circular pipe piece is symmetrically removed one by one according to the serial number at two sides; removing the pipe piece within the range of 180-degree vault of each ring pipe piece, erecting a movable supporting steel ring on the pipe piece before removing, and moving the steel ring to the next ring to remove the pipe piece in advance after the removal of the pipe piece is finished;

(6) cutting the pipe piece in the 180-degree range of the bottom of the pipe piece into small pieces by using a water drill or a rope saw, and removing the cut and crushed pipe piece by using an excavator;

the protective measures in the duct piece removing process are as follows:

(1) After the segment is removed, the arrangement state of the segments is broken, the segment is in a loosening state, and the permanent segment has the tendency of deformation and ellipticity increase.

The concrete solving method is as follows: before the underground excavation air shaft air duct is excavated, longitudinal connecting bolts of permanent duct pieces and duct pieces to be dismantled are dismantled, steel ring inner supports 16 with the outer diameters being tightly attached to the inner diameters of the duct pieces are erected in 10 ring duct pieces on two sides of a piston air duct in a shield tunnel, and as shown in figure 12, 25b type steel longitudinal connecting beams 17 are adopted to tension and connect the steel rings so as to prevent the duct pieces from being deformed and increased in the construction process.

(a) The steel ring inner support (prior art) is formed by assembling small arc blocks, wood wedges or concrete blocks are placed on the inner side of joints, and M5.8-grade phi 24 bolts are adopted to rotate and jack tightly.

(b) Two I-shaped steel vertical supports 23 which are spliced by a worker 40b in a double mode are arranged in the steel ring in an inner supporting mode, and the distance is 2000mm; three workers 25b are arranged to double-splice transverse I-steel supports 24, and the first distance is 1300mm from the top.

(c) Four I25 b type steel longitudinal connecting beams 17 are arranged at the upper, lower, left and right cross centers of the steel rings and are tensioned through the long type steel for longitudinal connection.

(d) Reliable welding is needed between the steel supports, and the height of the welding seam is not less than 8mm. As shown in FIG. 12;

(2) Referring to fig. 13, 14 and 15, before the air shaft duct is excavated, a duct piece removing section passes through duct pieces from the tunnel (adding duct piece grouting holes for radial grouting reinforcement;

each 4 rings of permanent section of jurisdiction in air shaft wind channel both sides is consolidated from the slip casting in the tunnel, consolidates the peripheral stratum of section of jurisdiction, and radial slip casting length is 2m, beats to establish 7 injected holes on every ring pipe sheet, and 4 injected holes are established to the lower part, and different slip casting points are selected to odd number ring and even number ring to ensure that every ring of injected hole is in the coplanar. The grouting slurry adopts single-liquid cement slurry, and during grouting operation, the grouting pressure and flow change conditions are observed, and grouting parameters are strictly controlled.

(3) Auxiliary grouting reinforcement in the vertical shaft and air duct pilot tunnel is shown in fig. 15 and 16;

before the duct piece is removed, the peripheral soil mass of 4 adjacent ring duct pieces at two ends of the secondary lining of the air shaft air duct is grouted and reinforced,

and (3) near the transverse pilot tunnel, grouting holes are drilled at the lower layer of the air duct pilot tunnel of the air shaft for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the drilling length is 4m. And (3) horizontally beating grouting holes for reinforcement when primary support is applied in the vertical shaft near the vertical shaft, wherein the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the beating length is 4m. The grout adopts single-liquid grout, grouting parameters are strictly controlled in the grouting process, the radius diffusion range of the grout reaches 0.5m, and the grout can be effectively lapped between grouting holes.

Claims (2)

1. A wind shaft air duct for breaking shield tunnel segment mine construction interval comprises an existing tunnel which comprises a left line tunnel and a right line tunnel, and is characterized by also comprising a first underground layer (1) and a second underground layer (2) of the wind shaft air duct constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for preliminary bracing until the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the underground second layer transversely extends to the outer edge of the shield tunnel from the position below the top of the tunnel and is constructed for primary support; a No. 1 vertical shaft (100) is arranged between the left and right linear tunnels, a No. 2 vertical shaft (120) is arranged at the outer side of the right linear tunnel, and primary support is constructed; a No. 1 vertical shaft hole (10) and a No. 2 vertical shaft hole (12) are formed in the middle partition plate of the underground layer (1); the underground first floor (1) and the underground second floor (2) are communicated with the left line, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.

2. The mine construction interval air shaft duct for breaking the segments of the shield tunnel according to claim 1, wherein two lining structures are arranged in the first underground layer, the second underground layer, the left line, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.

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