CN110685699A - Mine method tunnel shield empty pushing starting construction method - Google Patents
Mine method tunnel shield empty pushing starting construction method Download PDFInfo
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- CN110685699A CN110685699A CN201910977888.7A CN201910977888A CN110685699A CN 110685699 A CN110685699 A CN 110685699A CN 201910977888 A CN201910977888 A CN 201910977888A CN 110685699 A CN110685699 A CN 110685699A
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- tunnel
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- starting
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000009412 basement excavation Methods 0.000 claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 230000005641 tunneling Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005065 mining Methods 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 239000011440 grout Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 230000002452 interceptive effect Effects 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000011435 rock Substances 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 239000010438 granite Substances 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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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
- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a mine method tunnel shield empty push starting construction method, which comprises the following steps: s1) excavating an air-thrust tunnel on the selected excavation surface by adopting a mining method along the excavation direction of the shield machine; s2) reinforcing the tunnel face of the air-pushed tunnel; s3) constructing a shield guide table in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, and piling pea gravel on the constructed shield guide table; s4) the shield machine executes the empty pushing starting on the shield guide table, and the shield machine enters the empty pushing tunnel; s5) laying shield segments in the air-thrust tunnel by the shield machine, building a temporary sealing wall by attaching to an excavation surface to seal an air-thrust starting tunnel portal, and injecting first slurry between the shield segments and the tunnel wall of the air-thrust tunnel after laying the shield segments with the given ring number; s6) the tunnel face is broken, and the secondary starting of the shield machine in the air-thrust tunnel is completed. The construction method provided by the invention solves the problems of water leakage of the shield forming tunnel and later-stage tunnel settlement instability.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a mine method tunnel shield empty push starting construction method.
Background
In tunnel construction, shield construction is widely used due to the advantages of high excavation speed, low labor intensity, no influence on ground traffic facilities during construction and the like. However, in the process of tunnel construction by using the shield method, long-distance hard rock or hard strata above and below, boulder groups and other sections with special conditions often appear in the excavation direction of the shield machine, the shield cutter directly cutting the surrounding rock of such sections will cause abnormal damage of the cutter and even abrasion of the cutter head, and serious and even uncontrollable engineering accidents will be caused by untimely replacement of the abraded cutter or cutter head; the replacement of the cutter can prevent engineering accidents caused by cutter abrasion, but frequent replacement of the cutter can increase the engineering construction cost and also influence the construction speed of the tunnel, so that construction is carried out in such areas by adopting a construction mode combining a mine method and a shield method, namely, the tunnel excavation and initial support are carried out on the areas by the mine method in advance, and the shield machine continues to shield and empty and push the excavated tunnel by the mine method.
The problem that the shield machine leaks water due to extrusion of a water-stop adhesive tape which is not compact and causes leakage of a shield forming tunnel or filling of a duct piece wall which is not compact and causes later-stage tunnel settlement instability is easily caused because the existing shield machine starts empty pushing in the process of penetrating through a tunnel excavated by a mine method and starts excavation of the shield machine again later due to small reaction force in front of the shield machine, so that a shield starting method of the shield machine in the tunnel excavated by the mine method is urgently needed to solve at least one problem.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the shield machine has small front reaction force during tunneling initiation of tunneling machine tunneling by a mining method and after tunneling initiation of tunneling machine secondary excavation, water-stop rubber strips are extruded and are not compact, so that water leakage of a shield forming tunnel is caused, or the wall of a segment is not compact after filling, so that later-stage tunnel settlement is unstable.
In order to achieve the above object, an embodiment of the present invention provides a mine tunnel shield empty pushing starting construction method, where the starting construction method includes the following steps: s1) excavating an air-propelled tunnel with a given design size on the selected excavation surface by adopting a mining method along the excavation direction of the shield machine; s2) reinforcing the tunnel face of the air-pushed tunnel; s3) constructing a shield guide table in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, and piling pea gravel on the constructed shield guide table; s4) the shield machine executes the empty pushing starting on the shield guide table, and the shield machine enters the empty pushing tunnel; s5) the shield machine lays shield segments in the air-thrust tunnel, builds a temporary sealing wall by attaching to the excavation surface to seal an air-thrust starting tunnel portal, and injects first slurry between the shield segments and the tunnel wall of the air-thrust tunnel after laying a given number of rings of shield segments; s6), the tunnel face is broken, and the secondary starting of the shield machine in the air-thrust tunnel is completed.
Specifically, in step S2), reinforcing the tunnel face of the air-pushed tunnel includes: arranging a plurality of face grouting holes on the face, and injecting second grout into each face grouting hole; and applying a stable layer with a given thickness on the tunnel face by adopting glass fiber concrete to block the tunnel face.
In particular, the first pitch is between 1.2m and 1.5 m.
Specifically, step S3) further includes: after the shield guide table is constructed and before the pea gravel is stacked, measuring a plurality of cross sections of the shield guide table and the air-pushed tunnel to determine whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed starting.
Specifically, the performing measurement on a plurality of cross sections of the shield guide station and the air-thrust tunnel to determine whether the air-thrust tunnel meets the requirement of the shield machine for performing air-thrust originating includes: measuring diameter sizes of a plurality of cross sections of the air-pushed tunnel; measuring the elevation of the shield guide table and the flatness of the shield guide table; and determining whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed originating or not according to the measurement results of the plurality of cross sections of the air-pushed tunnel and the measurement result of the shield guide station.
Specifically, after the step S3), and before the step S4), the construction method further includes: and removing the cutter interfering with the shield guide table on the cutter head of the shield machine.
Specifically, in step S5), attaching the excavation face to construct a temporary sealing wall to seal the empty pushing starting tunnel portal includes: attaching the excavation face to build a temporary sealing wall so as to seal an annular gap formed between the shield segment and the tunnel wall of the air-pushed tunnel, embedding a plurality of exhaust pipes in the temporary sealing wall, and installing a ball valve at the air outlet of each exhaust pipe; paving a steel bar mesh on the temporary sealing wall; and performing spray anchor support on the temporary sealing wall paved with the reinforcing mesh to finish sealing the tunnel door by idle pushing.
Specifically, after step S5), the construction method further includes: and grouting the position of the opening on the sealed opening starting opening.
Specifically, the first slurry is prepared from water: cement: the water glass is prepared according to the proportion of 1:1: 1.
Specifically, in step S5), injecting a first slurry between the shield segment and the wall of the air-thrust tunnel includes: and injecting the first slurry between the shield segment and the tunnel wall of the air-thrust tunnel through the radial assembling hole of the shield segment.
The invention provides a mine method tunnel shield empty-push starting construction method, which adopts a mine method to dig out an empty-push tunnel with a given design size, wherein the excavated empty-push tunnel already spans surrounding rock sections which are not beneficial to the construction of a shield machine, the tunnel face of the empty-push tunnel is reinforced for the subsequent excavation safety of the shield machine, a shield guide table is manufactured in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, the shield machine carries out empty-push starting on the shield guide table and enters the empty-push tunnel along the extending direction of the shield guide table, pea granites are piled on the shield guide table in advance, shield segments are paved in the empty-push tunnel by the shield machine in the process that the shield machine moves towards the tunnel face after entering the empty-push tunnel along the shield guide table to reinforce the support of the empty-push tunnel, at the moment, the pea granites piled on the shield guide table in advance can provide support for the tail shield of the subsequent shield machine, the shield tail segment is prevented from sinking to generate a wrong platform, pea stones in front of a shield cutter head can increase the forward thrust of the shield, the compaction of the rear segment is facilitated, the segment water-stop adhesive tape is squeezed tightly, the water leakage of the formed tunnel segment is prevented, a temporary sealing wall is built by attaching an excavation surface to seal a blank-pushing starting tunnel portal in the process of laying the shield segment, the first slurry subsequently injected between the shield segment and the tunnel wall of the blank-pushing tunnel is prevented from flowing out from the gap between the shield segment on the excavation surface and the tunnel wall of the blank-pushing tunnel, in order to ensure the supporting effect of the shield segment laid by the shield machine on the blank-pushing tunnel, the first slurry is injected between the shield segment and the tunnel wall of the blank-pushing tunnel to fill the gap between the shield segment and the tunnel wall of the blank-pushing tunnel after the shield segment with a given number is laid in the blank-pushing tunnel each time, so that the shield, and later-period tunnel settlement instability is prevented.
According to the mine tunnel shield empty-pushing launching construction method, the method that pea gravel is stacked on the shield guide table, the temporary sealing wall is built and the first slurry is injected into the gap between the shield segment and the tunnel wall of the empty-pushing tunnel is adopted, the problems of water leakage of the shield forming tunnel and later-stage tunnel settlement instability are solved, meanwhile, the use of the template in the prior art when the empty-pushing launching portal is sealed is omitted by building the temporary sealing wall, the time for building and dismantling the template is saved, the construction cost is reduced, and the construction efficiency is accelerated.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a mine tunnel shield empty pushing starting construction method provided by an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a mine method tunnel shield empty pushing starting construction method, and fig. 1 is a flow chart of the mine method tunnel shield empty pushing starting construction method, as shown in fig. 1, the starting construction method comprises the following steps: s1) excavating an air-propelled tunnel with a given design size on the selected excavation surface by adopting a mining method along the excavation direction of the shield machine; s2) reinforcing the tunnel face of the air-pushed tunnel; s3) constructing a shield guide table in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, and piling pea gravel on the constructed shield guide table; s4) the shield machine executes the empty pushing starting on the shield guide table, and the shield machine enters the empty pushing tunnel; s5) the shield machine lays shield segments in the air-thrust tunnel, builds a temporary sealing wall by attaching to the excavation surface to seal an air-thrust starting tunnel portal, and injects first slurry between the shield segments and the tunnel wall of the air-thrust tunnel after laying a given number of rings of shield segments; s6), the tunnel face is broken, and the secondary starting of the shield machine in the air-thrust tunnel is completed.
According to the mine method tunnel shield empty-pushing starting construction method provided by the invention, the empty-pushing tunnel with a given design size is excavated in advance by adopting a mine method in the surrounding rock section which is not suitable for the shield machine to excavate, so that abnormal abrasion of a cutter of the shield machine is avoided, the surrounding rock condition excavated by the shield machine is different from the surrounding rock condition excavated by the mine method, and the tunnel face of the empty-pushing tunnel is reinforced in order to ensure the subsequent shield construction safety; in order to control the advancing direction and the tunneling direction of the shield machine, a shield guide table is constructed in the reverse direction of the tunneling direction of the shield machine, the advancing direction and the tunneling direction of the shield machine are limited by the shield guide table, pea stones are stacked on the shield guide table, and the stacked pea stones can provide support for segments of a shield tail laid by the shield machine, so that the segments of the shield tail are prevented from sinking to generate staggered platforms, the pea stones stacked in the front of a shield cutter head can increase the advancing thrust of the shield machine, the pressing of the segments at the rear part is facilitated, water-stop adhesive tapes between the segments of the shield machine are squeezed tightly, and the water leakage of the segments of a formed tunnel is prevented; the shield machine enters the air-thrust tunnel under the guidance of the shield guide table, and in the process of advancing towards the palm surface, the shield machine lays shield segments in the air-thrust tunnel, the laid shield segments reinforce and support the air-thrust tunnel, so that the support structure of the air-thrust tunnel is more stable, in order to prevent first slurry filled between the shield segments and the tunnel wall of the air-thrust tunnel from flowing out of an excavation surface, a temporary sealing wall is built by attaching the excavation surface to seal an air-thrust originating tunnel portal, the use of a template in the prior art when the air-thrust originating tunnel portal is sealed is omitted, the time for building and dismantling the template is saved, the construction cost is reduced, and the construction efficiency is accelerated; in order to ensure that the gap between the shield segment and the air-thrust tunnel is tightly filled and prevent the later-stage tunnel from being subsided and unstable, first slurry is injected between the shield segment and the tunnel wall of the air-thrust tunnel, the shield segment and the air-thrust tunnel are tightly combined after the first slurry is solidified so as to exert the elastic resistance of surrounding rocks and reduce leakage, the shield machine advances in the air-thrust tunnel until the shield machine breaks away the tunnel face, and the secondary starting of the shield machine in the air-thrust tunnel is completed. The mine tunnel shield empty-pushing starting construction method provided by the invention solves the problems of water leakage of a shield forming tunnel and later-period tunnel settlement instability caused by the fact that filling between shield segments and empty-pushing tunnel walls is not compact.
In one embodiment, a concrete shield guide platform is constructed, for example, the thickness of the shield guide platform in the vertical horizontal direction is 400mm, the shield guide platform is made of a concrete spray anchor matched with a steel mesh, the chord length of the shield guide platform is 4064mm, in order to reserve a rotation space of a shield cutter head in secondary starting of the shield machine and avoid the shield cutter head from being blocked, a first distance is reserved between the shield guide platform and a tunnel face, and specifically, the first distance is between 1.2m and 1.5 m; piling pea gravel in advance on the shield guide table, providing support for the duct piece of the shield tail laid by the shield machine, preventing the duct piece of the shield tail from sinking to generate dislocation, piling pea gravel in front of a shield cutter head, increasing the forward thrust of the shield, being beneficial to compressing the duct piece at the rear and tightly extruding water-stop rubber strips between the duct pieces of the shield, preventing the formed tunnel duct piece from leaking water, and selecting the diameter of the piled pea gravel to be 5-10 mm.
In order to ensure the construction safety when the shield machine starts for the second time after passing through the air-pushed tunnel, specifically, in step S2), reinforcing the tunnel face of the air-pushed tunnel, the method includes: arranging a plurality of face grouting holes on the face, and injecting second grout into each face grouting hole; and applying a stable layer with a given thickness on the tunnel face by adopting glass fiber concrete to block the tunnel face.
In one embodiment, after the air-pushed tunnel is excavated by adopting the mining method, the surrounding rock condition excavated by the subsequent shield construction is a soft soil layer, grouting and reinforcing a soft soil layer behind the palm surface, uniformly arranging a plurality of palm surface grouting holes on the palm surface, wherein the diameter of each palm surface grouting hole is 110mm, the grouting pressure when grouting is carried out on each palm surface grouting hole is 0.5-1.5 MPa, the grouting termination pressure is greater than the hydrostatic pressure of 2MPa, the second grout injected into the palm surface grouting holes is double-grout prepared from cement and water glass grout, the diffusion range of the double-grout is ensured to be 3 meters when grouting is carried out, after grouting is finished, the glass fiber concrete is applied to the tunnel face to form a stabilizing layer with the thickness of 800mm so as to block the tunnel face, and the applied stabilizing layer can enable the tunnel face to have higher tensile strength and bending strength and can greatly improve the toughness of the tunnel face.
In order to ensure that the central line of the shield machine coincides with the central line of the designed tunnel when the shield machine performs secondary originating, and ensure that the secondary originating is performed smoothly, specifically, step S3) further includes: after the shield guide table is constructed and before the pea gravel is stacked, measuring a plurality of cross sections of the shield guide table and the air-pushed tunnel to determine whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed starting.
Specifically, the performing measurement on a plurality of cross sections of the shield guide station and the air-thrust tunnel to determine whether the air-thrust tunnel meets the requirement of the shield machine for performing air-thrust originating includes: measuring diameter sizes of a plurality of cross sections of the air-pushed tunnel; measuring the elevation of the shield guide table and the flatness of the shield guide table; and determining whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed originating or not according to the measurement results of the plurality of cross sections of the air-pushed tunnel and the measurement result of the shield guide station.
In one embodiment, when measuring a plurality of cross sections of the shield guide platform and the air-thrust tunnel, specifically measuring the diameter sizes of the plurality of cross sections of the air-thrust tunnel, for example, the length of the air-thrust tunnel is 100m, determining a cross section every 5m along the longitudinal direction of the air-thrust tunnel, totally determining 20 cross sections, measuring the diameter size of each cross section, comparing the measured diameter size of each cross section with the diameter size of a shield machine body, if the diameter size of each cross section is greater than the diameter size of the shield machine body by 30cm, the air-thrust tunnel meets the air-thrust initiation requirement, if the diameter size of any cross section is not greater than the diameter size of the shield machine body by 30cm, the air-thrust tunnel does not meet the air-thrust initiation requirement of the shield machine, judging that the air-thrust tunnel is underexcavated, and determining an underexcavated section in the air-thrust tunnel according to the measured diameters of the plurality of cross sections, eliminating the underdigging section before the shield machine idle pushing is started; the method comprises the steps of measuring the elevation of the shield guide table and the flatness of the shield guide table, controlling the elevation error of the shield guide table to be less than or equal to 15mm, and controlling the flatness error of the shield guide table to be less than or equal to 15mm so as to enable the center line of the shield machine to coincide with the center line of a designed tunnel to ensure that the shield machine smoothly advances in an air-propelled tunnel, and further ensure the construction quality of the tunnel excavated by the shield machine.
In order to ensure that the null push starts to proceed smoothly, specifically, after the step S3) and before the step S4), the construction method further includes: and removing the cutter interfering with the shield guide table on the cutter head of the shield machine. The method comprises the steps of detaching a cutter interfering with a shield guide table on a cutter head of the shield machine, enabling the shield machine to advance smoothly in the air-thrust tunnel, avoiding abrasion of the cutter on the cutter head when the shield machine advances in the air-thrust tunnel, and mounting the detached cutter on the cutter head again when the shield machine advances to the end of the shield guide table in the air-thrust tunnel and the cutter head is located at a first interval between the shield guide table and a tunnel face to ensure that secondary starting is finished smoothly.
Specifically, in step S5), attaching the excavation face to construct a temporary sealing wall to seal the empty pushing starting tunnel portal includes: attaching the excavation face to build a temporary sealing wall so as to seal an annular gap formed between the shield segment and the tunnel wall of the air-pushed tunnel, embedding a plurality of exhaust pipes in the temporary sealing wall, and installing a ball valve at the air outlet of each exhaust pipe; paving a steel bar mesh on the temporary sealing wall; and performing spray anchor support on the temporary sealing wall paved with the reinforcing mesh to finish sealing the tunnel door by idle pushing.
In one embodiment, when the air-pushing starting tunnel portal is sealed, an excavation surface is attached to build a temporary sealing wall, the built temporary sealing wall blocks an annular gap formed between a shield segment and the tunnel wall of the air-pushing tunnel, a plurality of PVC exhaust pipes with the length of 1m and the diameter of 100mm are embedded in the temporary sealing wall according to design requirements, the embedding positions of the exhaust pipes are the top and two sides of the air-pushing starting tunnel portal respectively, a ball valve is installed at the air outlet of each exhaust pipe, then a steel bar mesh is laid on the temporary sealing wall, and spray anchor support is carried out on the temporary sealing wall on which the steel bar mesh is laid, so that the air-pushing starting tunnel portal is sealed.
In order to seal the gap between the duct piece and the air-pushed tunnel on the excavation surface and further stabilize the shield tunnel, and prevent the water leakage phenomenon of the tunnel after the later construction is completed, specifically, after the step S5), the construction method further comprises: and grouting the position of the opening on the sealed opening starting opening.
Specifically, the first slurry is prepared from water: cement: the water glass is prepared according to the proportion of 1:1: 1. First slurry is injected between the shield segment and the tunnel wall of the air-propelled tunnel, pea gravel at the rear part of the shield tail can be quickly solidified, and the shield segment is prevented from sinking after being separated from the shield tail.
Specifically, in step S5), injecting a first slurry between the shield segment and the wall of the air-thrust tunnel includes: and injecting the first slurry between the shield segment and the tunnel wall of the air-thrust tunnel through the radial assembling hole of the shield segment.
The invention provides a mine method tunnel shield empty-push starting construction method, which adopts a mine method to dig out an empty-push tunnel with a given design size, wherein the excavated empty-push tunnel already spans surrounding rock sections which are not beneficial to the construction of a shield machine, the tunnel face of the empty-push tunnel is reinforced for the subsequent excavation safety of the shield machine, a shield guide table is manufactured in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, the shield machine carries out empty-push starting on the shield guide table and enters the empty-push tunnel along the extending direction of the shield guide table, pea granites are piled on the shield guide table in advance, shield segments are paved in the empty-push tunnel by the shield machine in the process that the shield machine moves towards the tunnel face after entering the empty-push tunnel along the shield guide table to reinforce the support of the empty-push tunnel, at the moment, the pea granites piled on the shield guide table in advance can provide support for the tail shield of the subsequent shield machine, the shield tail segment is prevented from sinking to generate a wrong platform, pea stones in front of a shield cutter head can increase the forward thrust of the shield, the compaction of the rear segment is facilitated, the segment water-stop adhesive tape is squeezed tightly, the water leakage of the formed tunnel segment is prevented, a temporary sealing wall is built by attaching an excavation surface to seal a blank-pushing starting tunnel portal in the process of laying the shield segment, the first slurry subsequently injected between the shield segment and the tunnel wall of the blank-pushing tunnel is prevented from flowing out from the gap between the shield segment on the excavation surface and the tunnel wall of the blank-pushing tunnel, in order to ensure the supporting effect of the shield segment laid by the shield machine on the blank-pushing tunnel, the first slurry is injected between the shield segment and the tunnel wall of the blank-pushing tunnel to fill the gap between the shield segment and the tunnel wall of the blank-pushing tunnel after the shield segment with a given number is laid in the blank-pushing tunnel each time, so that the shield, and later-period tunnel settlement instability is prevented.
According to the mine tunnel shield empty-pushing launching construction method, the method that pea gravel is stacked on the shield guide table, the temporary sealing wall is built and the first slurry is injected into the gap between the shield segment and the tunnel wall of the empty-pushing tunnel is adopted, the problems of water leakage of the shield forming tunnel and later-stage tunnel settlement instability are solved, meanwhile, the use of the template in the prior art when the empty-pushing launching portal is sealed is omitted by building the temporary sealing wall, the time for building and dismantling the template is saved, the construction cost is reduced, and the construction efficiency is accelerated.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A mine method tunnel shield empty pushing starting construction method is characterized by comprising the following steps:
s1) excavating an air-propelled tunnel with a given design size on the selected excavation surface by adopting a mining method along the excavation direction of the shield machine;
s2) reinforcing the tunnel face of the air-pushed tunnel;
s3) constructing a shield guide table in the reverse direction of the tunneling direction of the shield machine at a first distance from the tunnel face, and piling pea gravel on the constructed shield guide table;
s4) the shield machine executes the empty pushing starting on the shield guide table, and the shield machine enters the empty pushing tunnel;
s5) the shield machine lays shield segments in the air-thrust tunnel, builds a temporary sealing wall by attaching to the excavation surface to seal an air-thrust starting tunnel portal, and injects first slurry between the shield segments and the tunnel wall of the air-thrust tunnel after laying a given number of rings of shield segments;
s6), the tunnel face is broken, and the secondary starting of the shield machine in the air-thrust tunnel is completed.
2. The mine method tunnel shield empty pushing starting construction method as claimed in claim 1, wherein in the step S2), reinforcing the tunnel face of the empty pushing tunnel comprises the following steps:
arranging a plurality of face grouting holes on the face, and injecting second grout into each face grouting hole;
and applying a stable layer with a given thickness on the tunnel face by adopting glass fiber concrete to block the tunnel face.
3. The mine method tunnel shield empty pushing starting construction method according to claim 1, wherein the first spacing is between 1.2m and 1.5 m.
4. The mining method tunnel shield empty pushing starting construction method as claimed in claim 1, wherein the step S3) further comprises the following steps: after the shield guide table is constructed and before the pea gravel is stacked, measuring a plurality of cross sections of the shield guide table and the air-pushed tunnel to determine whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed starting.
5. The mining method tunnel shield empty push starting construction method as claimed in claim 4, wherein the performing measurement on the shield guide platform and the plurality of cross sections of the empty push tunnel to determine whether the empty push tunnel meets the requirement of the shield machine for performing empty push starting comprises:
measuring diameter sizes of a plurality of cross sections of the air-pushed tunnel;
measuring the elevation of the shield guide table and the flatness of the shield guide table;
and determining whether the air-pushed tunnel meets the requirement of the shield machine for executing air-pushed originating or not according to the measurement results of the plurality of cross sections of the air-pushed tunnel and the measurement result of the shield guide station.
6. The mining method tunnel shield empty pushing starting construction method as claimed in claim 1, wherein after the step S3) and before the step S4), the construction method further comprises: and removing the cutter interfering with the shield guide table on the cutter head of the shield machine.
7. The mining method tunnel shield empty pushing starting construction method as claimed in claim 1, wherein in the step S5), the step of attaching the excavation face masonry temporary sealing wall to seal the empty pushing starting tunnel door comprises the following steps:
attaching the excavation face to build a temporary sealing wall so as to seal an annular gap formed between the shield segment and the tunnel wall of the air-pushed tunnel, embedding a plurality of exhaust pipes in the temporary sealing wall, and installing a ball valve at the air outlet of each exhaust pipe;
paving a steel bar mesh on the temporary sealing wall;
and performing spray anchor support on the temporary sealing wall paved with the reinforcing mesh to finish sealing the tunnel door by idle pushing.
8. The mining method tunnel shield empty pushing starting construction method as claimed in claim 1, wherein after the step S5), the construction method further comprises:
and grouting the position of the opening on the sealed opening starting opening.
9. The mining method tunnel shield empty pushing starting construction method according to claim 1, wherein the first slurry is prepared by mixing water: cement: the water glass is prepared according to the proportion of 1:1: 1.
10. The mining method tunnel shield empty pushing starting construction method as claimed in claim 9, wherein in the step S5), injecting a first slurry between the shield segment and the tunnel wall of the empty pushing tunnel comprises:
and injecting the first slurry between the shield segment and the tunnel wall of the air-thrust tunnel through the radial assembling hole of the shield segment.
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