CN112483094A - Construction method for reinforcing U-shaped structure of old tunnel - Google Patents
Construction method for reinforcing U-shaped structure of old tunnel Download PDFInfo
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- CN112483094A CN112483094A CN202011448042.3A CN202011448042A CN112483094A CN 112483094 A CN112483094 A CN 112483094A CN 202011448042 A CN202011448042 A CN 202011448042A CN 112483094 A CN112483094 A CN 112483094A
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- 238000010276 construction Methods 0.000 title claims abstract description 87
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 63
- 241001023788 Cyttus traversi Species 0.000 claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 141
- 239000010959 steel Substances 0.000 claims description 141
- 238000000034 method Methods 0.000 claims description 23
- 239000004567 concrete Substances 0.000 claims description 20
- 239000011378 shotcrete Substances 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000002356 single layer Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 13
- 238000005507 spraying Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a construction method for reinforcing a bridgehead opening structure of an old tunnel, which relates to the field of tunnel construction and construction, and comprises the old tunnel, wherein the old tunnel comprises a bridgehead opening section positioned in the middle and common sections positioned at two ends, and the construction method for reinforcing the bridgehead opening structure of the old tunnel comprises the following steps: step 1, reinforcing a common section; step 2, reinforcing the horse head section; step 3, drilling and grouting the top of the side wall of the tunnel to form a forepoling; step 4, cutting off the side wall of the old tunnel; and 5, constructing a horse head opening structure. The structure and the construction method provided by the invention are based on the principle of reducing the existing lining damage disturbance, and the old tunnel is reinforced and reformed.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for reinforcing a U-shaped structure of an old tunnel.
Background
With the great promotion of city infrastructure, in order to facilitate the traveling of people, each big city starts to promote the construction of urban rail transit, so as to relieve the traffic traveling pressure brought by the urbanization process. Under the condition of ensuring safety and not influencing existing traffic, most urban rail transit adopts a construction method mainly based on underground excavation, the burial depth of stations and intervals is usually deep, an auxiliary gallery (construction channel) is required to be newly built during construction by the underground excavation method to enter the construction position of a main structure, the construction channel serving as a temporary structure is generally long in length, the temporary land area on the ground is large, the construction period is correspondingly prolonged, and the construction cost is relatively high. Considering the reasons of construction cost, construction period and construction land, if old and abandoned railways, highway tunnels and civil defense caverns exist in the planned construction planning range, and the operation space created by the existing tunnels is used for constructing the planned auxiliary gallery, the construction cost of the planned construction can be greatly reduced, the waste of temporary engineering is reduced, the construction period is shortened, and the interference to the passing of peripheral roads and the normal life of people can also be reduced.
After an old tunnel structure is built, a stress field around a stratum tends to be stable, a secondary stress field generated by opening a hole on the existing structure is superposed with an initial stress field, and how to ensure the safety of the structure and the existing buildings around the structure under the condition of complicated stress becomes a problem which needs to be solved urgently in the tunnel construction process.
Disclosure of Invention
In order to overcome the problems in the related art, the disclosed embodiment of the invention provides a construction method for reinforcing a ingate structure of an old tunnel. The technical proposal is as follows,
According to a first aspect of the disclosed embodiments of the present invention, there is provided a construction method for reinforcing a ingate structure of an old tunnel, including an old tunnel, the old tunnel including an ingate section located in the middle and ordinary sections located at both ends, characterized in that the construction method for reinforcing the ingate structure of the old tunnel includes the following steps:
step 1, reinforcing a common section;
step 3, drilling and grouting the top of the side wall of the tunnel to form a forepoling;
step 4, cutting off the side wall of the old tunnel;
and 5, constructing a horse head opening structure.
In one embodiment, the step of reinforcing the common section is specifically to reinforce the common section by hanging a steel bar mesh, spraying single-layer concrete and erecting a steel frame.
In one embodiment, the step of reinforcing the horsehead, specifically includes the following steps:
reinforcing, namely reinforcing the U-shaped door section by adopting a semi-closed type steel frame and net-sprayed concrete;
a temporary supporting step, constructing a temporary steel pipe column before lateral opening, ensuring that the column bottom is smooth and compact, and forming a temporary supporting structure with a semi-closed steel frame in a closed mode;
and (3) a permanent supporting step, namely dismantling the ring beam of the section of the U-shaped steel frame to be split according to concrete design standard after the self strength and the stable deformation of the ring beam are achieved, and connecting the semi-closed steel frame and the ring beam through a support to form a permanent supporting structure.
In one embodiment, in the step of removing the old tunnel sidewall, specifically,
and excavating the side wall of the old tunnel along the axial direction of the newly-built tunnel, and performing step-by-step and block-by-block cutting treatment on the side wall at the corresponding position of the new horsehead door ring beam of the old tunnel based on the standard of removing the existing tunnel lining to the minimum extent.
In one embodiment, in the step of constructing the ingate structure, after the side wall part of the old tunnel is cut off, the ingate ring beam is poured step by step and in blocks, the steel plate is embedded in the ring beam, and the semi-closed steel frame of the ingate reinforcing section is fixed by welding the steel plate to form the ingate permanent supporting structure.
In one embodiment, in the step of cutting off the side wall of the old tunnel, specifically, when the tunnel at the ingate section is opened,
5.1 sequentially cutting off the left, right and middle three parts of side walls at the corresponding positions of the newly-built ring beam of the old tunnel, and timely constructing hidden columns at two sides and a top ring beam;
5.2, the left side wall and the right side wall of the old tunnel are broken, and bottom ring beams at the left side and the right side are constructed;
and 5.3, breaking the side wall in the middle of the old tunnel and constructing a ring beam at the bottom of the middle.
In one embodiment, the 5.3 excavating the rock-soil mass in the middle of the tunnel and constructing the middle bottom ring beam specifically comprises the following steps:
5.3.1, completing the advanced support of the top of the side wall of the old tunnel and completing the lining and reinforcing steel frame arrangement of the U-shaped gate section;
5.3.2, cutting off a corresponding part of a newly built top ring beam in the middle of the side wall of the old tunnel, pouring the top ring beam in time, and reserving a steel bar connector at an interface;
5.3.3, cutting off the corresponding part of the temporary steel pipe column in the middle of the side wall of the old tunnel, and constructing the temporary steel pipe column;
5.3.4, cutting off the newly built hidden columns on the left half part of the side wall of the old tunnel and the corresponding parts of the top ring beam, then constructing the hidden columns and the ring beam of the parts, and reserving a steel bar connector at the interface position;
5.3.5, cutting off the newly built hidden columns on the right half part of the old tunnel side wall and the corresponding parts of the top ring beam, then constructing the hidden columns and the ring beam of the newly built hidden columns, and reserving a steel bar connector at the interface position;
5.3.6, integrally breaking the left residual part of the side wall of the old tunnel and constructing a left part bottom ring beam;
5.3.7, integrally breaking the left part of the right side of the old tunnel side wall, and constructing a bottom ring beam of the right side part;
5.3.8, integrally breaking the remaining middle part of the side wall of the old tunnel and the temporary steel pipe column poured at the early stage, and constructing a bottom ring beam at the middle part to finish bottom beam sealing.
5.3.9, the deformation monitoring is stable, the construction of the ingate structure is completed, the section steel temporary upright post is removed, and the ingate permanent supporting structure is formed.
In one embodiment, after the side wall ring beam with the holes on the side surface reaches the design strength and deforms stably, the temporary steel pipe columns are dismantled, the semi-closed steel frame is connected to the ring beam through the connecting steel plate, the steel frame is connected with the erecting steel plate in a welding mode, and the connecting steel plates are connected through bolts.
According to a first aspect of the disclosed embodiments of the present invention, there is provided an old tunnel reinforcing ingate structure suitable for the construction method of the old tunnel reinforcing ingate structure, where the old tunnel reinforcing ingate structure includes: the steel frame, the reinforcing mesh, the sprayed concrete and the ring beam are erected inside the old tunnel, the reinforcing mesh is hung and the sprayed concrete is used for reinforcing in the hole, and the steel frame is fixedly connected with the ring beam through the connecting steel plate.
The technical scheme provided by the embodiment of the invention has the following beneficial effects that the invention provides operation space for the planned tunnel project by utilizing the old tunnel, reduces the construction cost compared with an open excavation construction method or a hidden excavation construction method combined with a vertical shaft, effectively saves the occupied ground area during construction, and reduces the influence on the existing urban traffic. When the old tunnel is broken wall and excavated and the new tunnel is built, the temporary steel pipe columns are constructed to form a temporary structure to bear the main load of the construction process, the main load is converted into a permanent structure consisting of a steel frame and a horsehead door section ring beam to bear the main load, and weak links such as the horsehead door are reinforced. In the excavation process of the ingate door section, the method is different from the traditional tunnel construction method, based on the standard of removing the existing tunnel lining to the minimum degree, the side walls of the tunnel to be excavated are subjected to step division, block cutting and timely construction of a ring beam and a hidden column, after the strength and deformation of the ring beam are stable, the left side wall and the right side wall are broken under the protection of the ring beam at the top, a temporary support is removed, the middle residual side wall is broken, finally a bottom beam is constructed to seal the ring beam, the deformation monitoring is stable, the construction of the ingate door structure is completed, the section steel temporary stand columns are removed, the ingate permanent supporting structure is formed, and the construction of the ingate door structure is completed. The construction and subsequent construction steps for reinforcing the old tunnel and opening the ingate structure are different from the traditional tunnel construction method, are more suitable for the working condition based on broken wall excavation of the old tunnel according to local conditions, and simultaneously the combination of the subsequent excavation methods furthest ensures the safety of the old structure, the newly-built structure and the peripheral existing buildings, the construction efficiency is simultaneously ensured, the construction land is reduced, the construction cost is reduced, and the influence on the peripheral old road traffic is reduced, and the method specifically comprises the steps that the ordinary sections of the first and old tunnels are reinforced by adopting a method of erecting steel frames and hanging nets to spray concrete;
secondly, the section of the U-shaped steel frame and the hanging net are reinforced by concrete,
thirdly, erecting a temporary steel pipe column before opening the hole, closing the temporary steel pipe column and the opposite side steel frame to form a temporary supporting system, and dismantling the temporary steel pipe column after opening the hole; and simultaneously, fixedly connecting the steel support of the section to the top beam to form a closed permanent supporting system.
Fourthly, before the ingate structure is constructed, the top of the ingate structure is firstly finished with advanced support work such as a pipe shed or an advanced small conduit;
fifthly, the existing tunnel side wall at the position of the post-cast ring beam and the temporary steel pipe column is removed, then the ring beam is poured, the temporary steel pipe column is erected, after the ring beam and the temporary steel pipe column are transformed, the existing whole tunnel side wall and the semi-closed steel frame are broken and connected with the ring beam through the support, deformation monitoring is stable, the construction of the ingate structure is completed, the section steel temporary stand column is removed, and the ingate permanent supporting structure is formed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic flow chart of an old tunnel reinforcing ingate structure and a construction method thereof;
FIG. 2 is a steel frame floor plan view at the bottom beam of the interface section;
FIG. 3 is a diagram of the operation procedure for cutting the ring beam at the side wall of the interface;
FIG. 4 is a cross-sectional view A-A of a horsehead door section reinforcement structure;
FIG. 5 is a cross-sectional view of a conventional segment reinforcement structure B-B;
FIG. 6 is an external schematic view of a three-dimensional model temporary support structure of the present invention;
FIG. 7 is a schematic view of the interior of the three-dimensional model permanent support structure of the present invention;
reference numerals,
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The technical scheme provided by the embodiment of the invention relates to a construction method for reinforcing a U-shaped structure of an old tunnel, in particular to the technical field of tunnel construction. In the related technology, urban rail transit mostly adopts a construction method mainly based on underground excavation under the conditions of ensuring safety and not influencing existing traffic, the buried depth of stations and intervals is often deep, the construction of the underground excavation method only needs to build an auxiliary gallery (construction channel) to enter the construction position of a main structure, the construction channel as a temporary structure is generally long, the temporary land area on the ground is large, the construction period is correspondingly prolonged, and the construction cost is relatively high. Based on the construction method, the old tunnel is used for creating a working space for a newly-built tunnel, and meanwhile, a structure and an excavation method suitable for reinforcing and reforming the old tunnel and opening the ingate are provided, wherein a common section of the old tunnel is reinforced by adopting a method of hanging a reinforcing mesh, spraying single-layer concrete and erecting a steel frame; the U-shaped steel frame is reinforced by a semi-closed steel frame and net-sprayed concrete, and a temporary steel column is constructed before lateral opening, and is closed with the semi-closed steel frame to form a temporary supporting structure; after the side wall of the old tunnel is cut off and the ingate structure is completely constructed, the semi-closed steel frame is fixedly connected with the ring beam through the support, and the temporary steel column is removed to form a permanent supporting structure for reinforcing the ingate. The existing old abandoned tunnel is effectively utilized, the length of auxiliary tunnels such as a newly-built construction channel is reduced, the construction cost is reduced, the occupied area of a construction site is further reduced, and the influence on urban traffic is reduced to the greatest extent.
Fig. 1 is a flow chart illustrating steps of a construction method for reinforcing a ingate structure of an old tunnel according to the technical solution disclosed in the present invention. As can be seen from fig. 1, a construction method for reinforcing a ingate structure of an old tunnel comprises the old tunnel, wherein the old tunnel comprises an ingate section located in the middle and common sections located at two ends, and the construction method for reinforcing the ingate structure of the old tunnel comprises the following steps:
step S01, reinforcing the common section;
step S02, reinforcing the horse head section;
and S03, drilling and grouting the top of the side wall of the tunnel before laterally opening the old tunnel to form a forepoling, and drilling and grouting the top of the side wall of the tunnel before laterally opening the old tunnel to complete the forepoling. In the embodiment, the drill hole is positioned outside the contour line of the lateral opening and has no direct connection with a subsequent excavation channel;
step S04, cutting off the side wall of the old tunnel;
step S05, constructing a horse head opening structure;
and step S06, constructing a supporting structure and a backfill layer of the newly-built tunnel.
Further, in the step of reinforcing the common section, specifically, the common section is reinforced by hanging a steel mesh, spraying single-layer concrete and erecting a steel frame, in this embodiment, when erecting a steel frame, when two adjacent steel frames are spliced, the joints of the arch parts of the steel frames should be spliced in a staggered manner, so as to ensure the balance of the whole stress system. In the connection mode, the steel frame is welded with the erection steel plate, and the connection steel plates are connected by bolts. In the key stressed section, such as the split-horse-head door reinforcing section, the supporting structure is reinforced by arranging steel frames in an encrypted manner, and the specific arrangement strategy is to arrange three simultaneous steel frames, so that the rigidity of the key section structure is enhanced, and the safety of the whole stressed system is guaranteed. And all the distributed ring beams are connected by adopting a reserved steel bar connector, and the ring beams are poured to form a whole. The arrangement of the concrete steel frames, the arrangement of the ring beam steel bars and the concrete are specifically analyzed and considered according to the actual working conditions of each project.
Preferably, in the step S02 of reinforcing the horse head, the method specifically includes the following steps:
the strengthening step S021 is that the U-shaped door section is strengthened by adopting a semi-closed steel frame and net-sprayed concrete;
a temporary supporting step S022, constructing a section steel temporary upright post before lateral hole opening, ensuring that the bottom of the upright post is smooth and compact, and closing the section steel temporary upright post and a semi-closed steel frame to form a temporary supporting structure;
as a further optimized scheme, in the step S022, the temporary steel columns are fabricated before lateral hole opening. In the embodiment, the bottom of the temporary steel pipe column needs to be cleaned of residues, the bottom of the column is guaranteed to be flat and compact, and the temporary steel pipe column can be located on bedrock when necessary.
And S023, removing the ring beam of the section of the temporarily erected H-shaped steel frame where the horse head door is to be opened after the ring beam reaches the self strength and is stably deformed according to the concrete design specification, and connecting the semi-closed steel frame with the ring beam by a support to form a permanent supporting structure.
The reinforcement means for the horsehead door segment in step S02 includes the non-holed side and the horsehead door side. The side, which is not provided with the hole, of the ingate section is reinforced by adopting measures of erecting a steel frame and hanging a net to spray concrete; one side of the U-shaped steel door is reinforced by adopting a semi-closed type steel frame and sprayed concrete, a section steel temporary stand column is erected before the opening, and the section steel temporary stand column and the other side steel frame are closed to form a temporary supporting structure, so that the stress stability of surrounding rocks and the whole reinforcing system during subsequent construction is ensured, and the risk of the construction period is reduced
Further, in the step S04, the old tunnel sidewall is removed, specifically,
and excavating the side wall of the old tunnel along the axial direction of the newly-built tunnel, and performing step-by-step and block cutting treatment on the side wall of the old tunnel based on the standard of removing the existing tunnel lining to the minimum extent.
In one embodiment, in the step S05, the step of constructing the ingate structure is specifically to, after the side wall of the old tunnel is partially cut off, timely, pour the ingate ring beam step by step and in blocks, embed the steel plate in the ring beam, and fix the semi-closed steel frame at the ingate reinforcing section by welding the steel plate to form the ingate permanent supporting structure.
Further, in the step S04, the old tunnel side wall is cut off, specifically, when the ingate tunnel is opened, the tunnel is opened
S05.1, sequentially cutting off the left, right and middle part of side walls at the position of the newly-built ring beam of the old tunnel, and timely constructing hidden columns at two sides and a top ring beam;
s05.2, excavating rock and soil bodies on the left side and the right side, and constructing bottom beams on the left side and the right side;
and S05.3, excavating rock and soil mass in the middle of the tunnel and constructing a bottom ring beam in the middle.
In one embodiment, the step S05.3 of excavating rock-soil mass in the middle of the tunnel and constructing the bottom ring beam in the middle of the tunnel specifically includes the following steps:
s05.3.1, performing advance support on the top of the side wall of the old tunnel, and arranging a reinforcing steel frame for the split U-shaped door section;
s05.3.2, cutting off the side wall part of the old tunnel in the range I, constructing a top ring beam at the position, and reserving a steel bar connector at the interface position;
s05.3.3, cutting off the side wall part of the old tunnel in the range II, constructing a temporary steel pipe column in the range II for filling, and removing residues on the base of the temporary steel pipe column
S05.3.4, cutting off the side wall part of the old tunnel in the III range, constructing the hidden column and the ring beam of the part, and reserving a steel bar connector at the interface position;
5.3.5, cutting off the side wall part of the old tunnel in the IV range, constructing the hidden column and the ring beam of the part, and reserving a steel bar connector at the interface position;
5.3.6, cutting the side wall of the old tunnel in the V range, and constructing a bottom ring beam in the VI range;
5.3.7, cutting off the side wall of the old tunnel in the VII range, and constructing a bottom ring beam in the VIII range;
5.3.8, cutting the old tunnel side wall in the IX range and the temporary steel pipe column in the II range, and constructing a bottom ring beam in the X range to finish bottom beam sealing;
5.3.9, the deformation monitoring is stable, the construction of the ingate structure is completed, the section steel temporary upright post is removed, and the ingate permanent supporting structure is formed. And a deformation joint 7 is arranged between the subsequent newly-built construction channel and the ingate structure.
Further, after the side wall ring beam of the split ingate reaches the concrete strength of the side wall ring beam and is stable in deformation, the temporary steel pipe column is dismantled, the semi-closed steel frame is connected to the ring beam through the connecting steel plate, the steel frame is connected with the erection steel plate in a welding mode, and the connecting steel plates are connected through bolts.
The concrete construction process of the old tunnel reinforcing ingate structure and the construction method thereof in the embodiment is described below with reference to fig. 2 to 4 and 7:
the U-shaped door structure for reinforcing the old tunnel comprises a section steel frame, a reinforcing mesh, sprayed concrete and a ring beam, wherein the section steel frame is erected inside the old tunnel, the reinforced mesh is hung and the sprayed concrete is reinforced in a hole, and the steel frame is fixedly connected with the ring beam through a connecting steel plate.
Referring to fig. 2 and 5, erecting a common section steel frame 1 and a bottom section steel frame 11, connecting the steel frames through bolts, hanging reinforcing mesh and spraying concrete to complete the reinforcing work of the common section of the old tunnel;
referring to fig. 2 and 4, constructing a forepoling 6 on the top of the side wall of the tunnel split door section of the old tunnel, erecting a common section steel frame 2, a double-spliced section steel frame 10 and a bottom section steel frame 11, erecting a section steel temporary upright post 5, connecting the steel frames through bolts, hanging a reinforcing mesh and spraying concrete, and completing the temporary reinforcement work on the tunnel split door section of the old tunnel;
referring to fig. 3, 4 and 6, the old tunnel side wall is cut off step by step and in blocks, and the ring beam is constructed in time to complete the construction of the split-head door section structure. The method specifically comprises the following steps:
cutting off the side wall I of the old tunnel, and newly building a top ring beam 12 at the position;
cutting off the old tunnel side wall II and constructing a temporary steel pipe column 13 at the old tunnel side wall II;
cutting off the side wall III of the old tunnel, and constructing the hidden column and the top ring beam 14 at the position;
cutting off the old tunnel side wall IV, and constructing the hidden column and the top ring beam 15 at the position;
after the ring beam 12/13/14 reaches the designed strength of the concrete, old tunnel side walls V and VI are broken and the bottom ring beam 17 is constructed;
old tunnel side walls VII and VIII are removed, and a bottom ring beam 19 is constructed;
the old tunnel side walls IX and X are broken, the temporary steel pipe column 13 is dismantled, and a bottom ring beam 21 is constructed;
and (3) connecting the ring beams of all the subsections through the reserved steel bar connector, pouring concrete to form a whole body, and dismantling the temporary steel upright posts 4 after the whole body of the newly-built ring beam reaches the design strength of the concrete and the monitoring data is stable. And finishing the construction of the permanent supporting structure of the U-shaped door section.
With reference to fig. 4 and 7, after the horsehead door opening structure is completed and the strength and deformation of the horsehead door opening structure are stable, the steel plate is embedded in the top ring beam 8, and the horsehead door reinforcing section semi-closed steel frame 2 is fixed with the bolts through the welded steel plate to form a permanent horsehead door opening supporting structure.
The embodiment creates a working space for a newly-built tunnel based on an old tunnel, and provides a structure and an excavation method suitable for reinforcing, reforming and driving a ingate of the old tunnel, so that the existing old abandoned tunnel is effectively utilized, the length of a newly-built construction channel is reduced, the construction cost is reduced, the occupied area of a construction site is further reduced, and the influence on urban traffic is reduced to the greatest extent. The construction method adopts the cutting treatment and the special excavation process, reduces the disturbance to surrounding rocks in the tunnel construction process, reduces the danger degree of large deformation in the tunnel construction process, and simultaneously strengthens the structural stress concentration and weak parts, thereby ensuring the safety in the construction process.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.
Claims (9)
1. A construction method for reinforcing a ingate structure of an old tunnel comprises the old tunnel, wherein the old tunnel comprises an ingate section positioned in the middle and common sections positioned at two ends, and is characterized by comprising the following steps:
step 1, reinforcing a common section;
step 2, reinforcing the horse head section;
step 3, drilling and grouting the top of the side wall of the tunnel to form a forepoling;
step 4, cutting off the side wall of the old tunnel;
and 5, constructing a horse head opening structure.
2. The method for constructing an old tunnel reinforcing split ingate structure according to claim 1, wherein the step of reinforcing the ordinary section is to hang a steel bar net, spray single-layer concrete and erect a steel-steel frame to reinforce the ordinary section.
3. The construction method for the reinforcement of the ingate structure of the old tunnel according to claim 1, wherein the reinforcement of the ingate section comprises the following steps:
reinforcing, namely reinforcing the U-shaped door section by adopting a semi-closed type steel frame and net-sprayed concrete;
a temporary supporting step, constructing a temporary steel pipe column before lateral opening, ensuring that the column bottom is smooth and compact, and forming a temporary supporting structure with a semi-closed steel frame in a closed mode;
and (3) a permanent supporting step, namely dismantling the ring beam of the section of the U-shaped steel frame to be split according to concrete design standard after the self strength and the stable deformation of the ring beam are achieved, and connecting the semi-closed steel frame and the ring beam through a support to form a permanent supporting structure.
4. The construction method for reinforcing the ingate structure of the old tunnel according to claim 1, wherein in the step of cutting the side wall of the old tunnel, specifically,
and excavating the side wall of the old tunnel along the axial direction of the newly-built tunnel, and performing step-by-step and block-by-block cutting treatment on the side wall at the corresponding position of the new horsehead door ring beam of the old tunnel based on the standard of removing the existing tunnel lining to the minimum extent.
5. The construction method for reinforcing the ingate structure of the old tunnel according to claim 1, wherein in the step of constructing the ingate structure, after the side wall part of the old tunnel is cut off, the ingate ring beam is poured step by step and in blocks, the steel plate is embedded in the ring beam, and the semi-closed steel frame of the ingate reinforcing section is fixed by welding the steel plate to form the ingate permanent supporting structure.
6. The construction method for reinforcing the ingate structure of the old tunnel according to claim 4, wherein in the step of cutting off the side wall of the old tunnel, in particular, when the ingate tunnel of the ingate section is opened,
5.1 sequentially cutting off the left, right and middle three parts of side walls at the corresponding positions of the newly-built ring beam of the old tunnel, and timely constructing hidden columns at two sides and a top ring beam;
5.2, the left side wall and the right side wall of the old tunnel are broken, and bottom ring beams at the left side and the right side are constructed;
and 5.3, breaking the side wall in the middle of the old tunnel and constructing a ring beam at the bottom of the middle.
7. The construction method for reinforcing the ingate structure of the old tunnel according to claim 6, wherein the 5.3 excavating the rock-soil mass in the middle of the tunnel and constructing the ring beam at the bottom of the middle part comprises the following steps:
5.3.1, completing the advanced support of the top of the side wall of the old tunnel and completing the lining and reinforcing steel frame arrangement of the U-shaped gate section;
5.3.2, cutting off a corresponding part of a newly built top ring beam in the middle of the side wall of the old tunnel, pouring the top ring beam in time, and reserving a steel bar connector at an interface;
5.3.3, cutting off the corresponding part of the temporary steel pipe column in the middle of the side wall of the old tunnel, and constructing the temporary steel pipe column;
5.3.4, cutting off the newly built hidden columns on the left half part of the side wall of the old tunnel and the corresponding parts of the top ring beam, then constructing the hidden columns and the ring beam of the parts, and reserving a steel bar connector at the interface position;
5.3.5, cutting off the newly built hidden columns on the right half part of the old tunnel side wall and the corresponding parts of the top ring beam, then constructing the hidden columns and the ring beam of the newly built hidden columns, and reserving a steel bar connector at the interface position;
5.3.6, integrally breaking the left residual part of the side wall of the old tunnel and constructing a left part bottom ring beam;
5.3.7, integrally breaking the left part of the right side of the old tunnel side wall, and constructing a bottom ring beam of the right side part;
5.3.8, integrally breaking the remaining middle part of the side wall of the old tunnel and the temporary steel pipe column poured at the early stage, and constructing a bottom ring beam at the middle part to finish bottom beam sealing.
5.3.9, the deformation monitoring is stable, the construction of the ingate structure is completed, the section steel temporary upright post is removed, and the ingate permanent supporting structure is formed.
8. The construction method of the old tunnel reinforcing ingate structure according to claim 7, wherein after the side wall ring beam with the side opening reaches the design strength and is stably deformed, the temporary steel pipe column is removed, the semi-closed steel frame is connected to the ring beam through the connecting steel plate, the steel frame is welded with the erecting steel plate, and the connecting steel plates are connected through bolts.
9. The reinforcing ingate structure for the old tunnel, which is applied to the construction method of the reinforcing ingate structure for the old tunnel according to any one of claims 1 to 8, wherein the reinforcing ingate structure for the old tunnel comprises:
steel frame, steel mesh, sprayed concrete and ring beam, wherein,
the steel frame is erected in the old tunnel, the steel mesh is hung and concrete is sprayed to reinforce the inside of the tunnel, and the steel frame is fixedly connected with the ring beam through the connecting steel plate.
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| CN104632228A (en) * | 2014-12-19 | 2015-05-20 | 中国建筑第四工程局有限公司 | Main track entering construction method for cross aisle and cross aisle |
| CN111594181A (en) * | 2020-05-07 | 2020-08-28 | 中铁十八局集团有限公司 | Construction method for communicating and connecting newly-added underground excavation channel and existing station hall layer |
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| CN111828016A (en) * | 2020-08-12 | 2020-10-27 | 北京市政建设集团有限责任公司 | Construction process for connecting underground excavated tunnel with existing line side wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104632228A (en) * | 2014-12-19 | 2015-05-20 | 中国建筑第四工程局有限公司 | Main track entering construction method for cross aisle and cross aisle |
| CN111594181A (en) * | 2020-05-07 | 2020-08-28 | 中铁十八局集团有限公司 | Construction method for communicating and connecting newly-added underground excavation channel and existing station hall layer |
| CN111779490A (en) * | 2020-07-28 | 2020-10-16 | 北京市市政工程设计研究总院有限公司 | Construction method and structure for enabling self-hole pile method tunnel to enter arch-connected tunnel in advance |
| CN111828016A (en) * | 2020-08-12 | 2020-10-27 | 北京市政建设集团有限责任公司 | Construction process for connecting underground excavated tunnel with existing line side wall |
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