CN111764923A - Construction method for dismantling temporary inverted arch of existing tunnel with cross-cut downward - Google Patents
Construction method for dismantling temporary inverted arch of existing tunnel with cross-cut downward Download PDFInfo
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- CN111764923A CN111764923A CN202010602558.2A CN202010602558A CN111764923A CN 111764923 A CN111764923 A CN 111764923A CN 202010602558 A CN202010602558 A CN 202010602558A CN 111764923 A CN111764923 A CN 111764923A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—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 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention discloses a construction method for dismantling a temporary inverted arch of an existing tunnel with an underpass skew, which is applied to dismantling construction of the temporary inverted arch in a skew section generated by constructing the tunnel and the existing tunnel; according to different stresses of the tunnel under construction, the diagonal sections generated by the tunnel under construction and the existing tunnel are divided into all dismantling sections, one dismantling section is selected as a test section, and the dismantling work is gradually carried out on the test section in a subsection and fractional manner, so that different construction methods can be adopted for all the sections more pertinently, and the construction safety is improved.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for dismantling a temporary inverted arch of an existing tunnel with a downward-penetrating oblique crossing.
Background
In the process of traffic construction, tunnel construction is a common engineering building, generally known is single tunnel construction, but with the acceleration of road construction footsteps, a plurality of constructions for constructing multi-line tunnels at the same position appear.
The construction of underpass of the existing tunnel is not only difficult, but also has certain potential safety hazard problems, and especially in the construction of obliquely crossing sections generated by the tunnel and the existing tunnel and the disassembly construction of temporary inverted arches, the problem of settlement generated by the existing tunnel can occur. In order to prevent uneven settlement of the existing tunnel and ensure the operation safety of the existing tunnel and the construction safety of a newly-built tunnel during construction, the requirement for dismantling the temporary inverted arch in the inclined crossing section generated between the built tunnel and the existing tunnel is higher and higher, and the construction safety of dismantling the temporary inverted arch is the key and difficult point for controlling the tunnel.
Disclosure of Invention
The invention aims to provide a construction method for dismantling a temporary inverted arch of an existing tunnel with a downward-penetrating skew, and aims to solve the technical problem that in the prior art, the dismantling construction of the temporary inverted arch is low in safety in a skew section generated by building the tunnel and the existing tunnel.
The invention is realized by the following technical scheme:
a construction method for dismantling a temporary inverted arch of an existing tunnel with an underpass skew is applied to dismantling construction of the temporary inverted arch in a skew section generated by a built tunnel and the existing tunnel;
the in-building tunnel comprises a right line A tunnel and a left line B tunnel, the existing tunnel comprises a C tunnel and a D tunnel, a first intersection point is generated when the right line A tunnel is intersected with the C tunnel, a second intersection point is generated when the right line A tunnel is intersected with the D tunnel, a third intersection point is generated when the left line B tunnel is intersected with the C tunnel, a fourth intersection point is generated when the left line B tunnel is intersected with the D tunnel, the right line A tunnel comprises a first boundary point and a second boundary point, and the left line B tunnel comprises a third boundary point and a fourth boundary point;
the first demarcation point and the first intersection point form a first demolition segment, the first intersection point and the second intersection point form a second demolition segment, and the second intersection point and the second demarcation point form a third demolition segment;
the third demarcation point and the third intersection point form a fourth demolition segment, the third intersection point and the fourth intersection point form a fifth demolition segment, and the fourth intersection point and the fourth demarcation point form a sixth demolition segment;
the concrete dismantling steps are as follows:
s1: selecting a test section: after the primary support of the oblique crossing section is penetrated, selecting the first dismantling section as a test section according to the dismantling direction of the tunnel under construction;
s2: dismantling a test section: gradually dismantling the test section in a sectional and fractional manner; if the dismantling result of the first test section is stable, the following steps are continuously executed:
and (4) completing all temporary inverted arch dismantling work of the oblique crossing section by the rest second dismantling section, the rest third dismantling section, the rest fourth dismantling section, the rest fifth dismantling section and the rest sixth dismantling section according to the dismantling principle that the right line is firstly dismantled, the left line is dismantled and the left line is then dismantled and the left line and the right line are staggered.
According to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the dismantling sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
The scheme also adopts the test section, can judge whether to carry out the demolition work of the subsequent oblique crossing section according to the demolition result of the test section, and can quickly find an inapplicable construction method, thereby effectively saving the working efficiency and improving the construction safety.
Further, the step of dismantling the test section of step S2 is as follows:
1) dividing the test section into a test section right below the existing tunnel and a test section obliquely below the existing tunnel;
2) spraying concrete for chiseling; the test section is dismantled in a grading and subsection mode according to the length of the one-time continuous breaking and chiseling sprayed concrete and the dismantling mode of the steel support in the test section, and the length of the one-time continuous breaking and chiseling sprayed concrete is carried out in the sequence from short to long;
3) dismantling the temporary steel support; after the test section finishes one-time continuous breaking and shotcrete breaking, the steel support starts to be dismantled within the time range of 12 hours, and the dismantling of the steel support comprises dismantling modes of 1 at intervals, 2 at intervals and 3 at intervals.
This scheme still adopts and divide into two kinds with the test segment, and the mode of demolising of two kinds of test segments is different, can be according to the different more effectual construction scheme of making of atress, can improve efficiency of construction and construction safety nature.
Further, the length of the test section is 24m, the length of the test section under the existing tunnel and the length of the test section under the existing tunnel are 12m, and the length of the one-time continuous breaking and spraying concrete is divided into three sections of 2m, 4m and 6 m; and the angle of the skew between the built tunnel and the existing tunnel is less than 45 degrees.
When the oblique crossing angle of the oblique crossing section generated by the tunnel and the existing tunnel is smaller than 45 degrees, the pressure values born by the tunnel and the existing tunnel are analyzed by the inventor, and when the oblique crossing angle is smaller than 45 degrees, the safety of the dismantling work can be well improved.
Further, the dismantling process of the test section right below the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 1 at intervals, and if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 partition, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 2-1 partition; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled in the steel support dismantling mode of 1-2 partition, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling the concrete in the steel support dismantling mode of 1-3 partition, namely completing the dismantling work of the test section under the existing tunnel.
Further, the dismantling process of the test section obliquely below the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 2 at intervals, if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 dismantling 2, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 1-3 dismantling; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled at intervals of 1-3, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling by adopting the steel support dismantling mode at intervals of 1-3 to complete the dismantling work of the test section obliquely below the existing tunnel.
Further, in the step 2), spraying is performed by adopting an air pick and manual mode.
This scheme is for avoiding the broken in-process of chiseling of shotcrete, produces too big vibrations, causes the secondary disturbance to primary support structure, arouses the quality of safety accident, when the broken chisel of shotcrete, should adopt pneumatic pick + artificial mode to go on, reduces vibrations.
Further, in the step 2), the reinforcing mesh is cut off at the same time, and the longitudinal connecting ribs are reserved.
Further, the number of single longitudinal steel support cutting is not more than 1 in the cutting of the steel mesh.
Further, the dismounting mode also comprises a dismounting mode of disassembling 1 at the partition 2 and a dismounting mode of disassembling 1 at the partition 3.
Further, selecting the first dismantling section as a test section, and dismantling the test section; selecting the fourth dismantling section as a second test section, dismantling the second test section, selecting the second dismantling section as a third test section, dismantling the third test section, selecting the fifth dismantling section as a fourth test section, dismantling the fourth test section, selecting the third dismantling section as a fifth test section, dismantling the fifth test section, selecting the sixth dismantling section as a sixth test section, dismantling the sixth test section;
the method for dismantling the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the method for dismantling the test sections.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the dismantling sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
2. The scheme also adopts the test section, can judge whether to carry out the demolition work of the subsequent oblique crossing section according to the demolition result of the test section, and can quickly find an inapplicable construction method, thereby effectively saving the working efficiency and improving the construction safety.
3. This scheme is for avoiding the broken in-process of chiseling of shotcrete, produces too big vibrations, causes the secondary disturbance to primary support structure, arouses the quality of safety accident, when the broken chisel of shotcrete, should adopt pneumatic pick + artificial mode to go on, reduces vibrations.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a cross section structure according to the present invention.
Fig. 2 is a dismantling flow chart of a test section right below an existing tunnel according to the invention.
FIG. 3 is a flow chart of the dismantling process of the test section obliquely below the existing tunnel.
Reference numbers and corresponding part names:
11-a first demarcation point; 12-a second demarcation point; 13-third demarcation point; 14-fourth demarcation point; 21-a first intersection; 22-a second intersection; 23-a third intersection; 24-a fourth intersection; 31-test section; 311-an existing tunnel test section at the oblique lower part; 312-test section directly under existing tunnel; 32-a second demolition segment; 33-a third demolition segment; 34-a fourth demolition segment; 35-a fifth demolition segment; 35-sixth demolition segment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
[ examples ] A method for producing a compound
As shown in fig. 1, a construction method for dismantling a temporary inverted arch of an existing tunnel passing through an oblique cross from bottom to top is applied to dismantling construction of the temporary inverted arch in an oblique cross section generated between a built tunnel and the existing tunnel;
the method comprises the following steps that the established tunnels comprise a right line A tunnel and a left line B tunnel, the existing tunnels comprise a C tunnel and a D tunnel, a first intersection 21 is generated when the right line A tunnel is intersected with the C tunnel, a second intersection 22 is generated when the right line A tunnel is intersected with the D tunnel, a third intersection 23 is generated when the left line B tunnel is intersected with the C tunnel, a fourth intersection 24 is generated when the left line B tunnel is intersected with the D tunnel, the right line A tunnel comprises a first demarcation point 11 and a second demarcation point 12, and the left line B tunnel comprises a third demarcation point 13 and a fourth demarcation point 14;
the first point of demarcation 11 and the first point of intersection 21 form a first demolition segment 31, the first point of intersection 21 and the second point of intersection 22 form a second demolition segment 32, and the second point of intersection 22 and the second point of demarcation 12 form a third demolition segment 33;
the concrete dismantling steps are as follows:
s1: selecting a test section: after the primary support of the diagonal section is penetrated, selecting the first dismantling section 31 as a test section according to the dismantling direction of the tunnel under construction;
s2: dismantling a test section: gradually dismantling the test section in a sectional and fractional manner; if the dismantling result of the first test section is stable, the following steps are continuously executed:
and (3) completing all temporary inverted arch dismantling work of the oblique section according to the dismantling principle that the left line is firstly dismantled, the left line is dismantled and then the left line is dismantled and the left line and the right line are staggered with the rest of the second dismantling section 32, the third dismantling section 33, the fourth dismantling section 34, the fifth dismantling section 35 and the sixth dismantling section 36.
According to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the dismantling sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
The scheme also adopts the test section, can judge whether to carry out the demolition work of the subsequent oblique crossing section according to the demolition result of the test section, and can quickly find an inapplicable construction method, thereby effectively saving the working efficiency and improving the construction safety.
Further, the step of dismantling the test section of step S2 is as follows:
1) dividing the test section into a test section 312 under the existing tunnel and a test section 311 under the existing tunnel in an inclined manner;
2) spraying concrete for chiseling; in the test section, the test section is dismantled in a grading and subsection mode according to the length of the one-time continuous breaking and chiseling sprayed concrete and the dismantling mode of the steel support, and the length of the one-time continuous breaking and chiseling sprayed concrete is carried out in the sequence from short to long;
3) dismantling the temporary steel support; after the test section finishes one-time continuous breaking and shotcrete breaking, the steel support starts to be dismantled within the time range of 12 hours, and the dismantling of the steel support comprises dismantling modes of 1 dismantling at intervals, 2 dismantling at intervals and 3 dismantling at intervals.
This scheme still adopts and divide into two kinds with the test segment, and the mode of demolising of two kinds of test segments is different, can be according to the different more effectual construction scheme of making of atress, can improve efficiency of construction and construction safety nature.
Further, the length of the test section is 24m, the length of the test section 312 under the existing tunnel and the length of the test section 311 under the existing tunnel are 12m, and the length of the one-time continuous breaking and spraying concrete is divided into three sections of 2m, 4m and 6 m; the angle of the skew between the built tunnel and the existing tunnel is less than 45 degrees.
When the oblique crossing angle of the oblique crossing section generated by the tunnel and the existing tunnel is smaller than 45 degrees, the pressure values born by the tunnel and the existing tunnel are analyzed by the inventor, and when the oblique crossing angle is smaller than 45 degrees, the safety of the dismantling work can be well improved.
As shown in fig. 2, further, the dismantling process of the test section 312 right below the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 1 at intervals, and if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 partition, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 2-1 partition; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled in the steel support dismantling mode of 1-2 partition, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling the concrete in the steel support dismantling mode of 1-3 partition, namely completing the dismantling work of the test section under the existing tunnel.
As shown in fig. 3, further, the dismantling process of the test section 311 at the lower oblique side of the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 2 at intervals, if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 dismantling 2, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 1-3 dismantling; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled at intervals of 1-3, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling by adopting the steel support dismantling mode at intervals of 1-3 to complete the dismantling work of the test section obliquely below the existing tunnel.
Further, in the step 2), the air pick and manual mode is adopted for injection.
This scheme is for avoiding the broken in-process of chiseling of shotcrete, produces too big vibrations, causes the secondary disturbance to primary support structure, arouses the quality of safety accident, when the broken chisel of shotcrete, should adopt pneumatic pick + artificial mode to go on, reduces vibrations.
Further, in the step 2), the reinforcing mesh is cut off at the same time, and the longitudinal connecting ribs are reserved.
Further, the number of the steel supports longitudinally cut for one time is not more than 1 in the cutting of the steel mesh.
Further, the removal mode also comprises the removal mode of removing 1 at the partition 2 and removing 1 at the partition 3.
Further, the first dismantling section 31 is selected as a test section, and after the test section is dismantled; selecting the fourth dismantling section 34 as a second test section, dismantling the second test section, selecting the second dismantling section 32 as a third test section, dismantling the third test section, selecting the fifth dismantling section 35 as a fourth test section, dismantling the fourth test section, selecting the third dismantling section 33 as a fifth test section, dismantling the fifth test section, and finally selecting the sixth dismantling section 36 as a sixth test section, dismantling the sixth test section;
the method for dismantling the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the method for dismantling the test sections.
As shown in fig. 1, in order to further illustrate the implementation process of this embodiment, this embodiment is described by using temporary inverted arch removal construction in a section of the existing No. 1 line under a section of a contract section tunnel i YDK33+ 468.366-YDK 33+559.022(ZDK33+ 430.420-ZDK 33+534.854) of reconstruction and extension of a municipal supporting project (track traffic No. 2 line second stage) at wuluqi airport 01:
in this embodiment, there are two first intersection points 21, two second intersection points 22, two third intersection points 23, and two fourth intersection points 24, and they are located at the intersection between the tunnel under construction and the existing tunnel respectively; two of the first, second, third and fourth demarcation points 11, 12, 13 and 14 are also provided.
In addition, in order to ensure safety, grading unloading is carried out in the temporary inverted arch dismantling process. Firstly chiseling off the temporary inverted arch and the sprayed concrete in the width range of 30-50 cm of the primary support node, and observing the stability of the primary support structure. And then, a transverse groove is drilled along the supporting direction (vertical to the tunnel direction) of the temporary inverted arch, and the longitudinal connecting rib and the reinforcing mesh are exposed.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A construction method for dismantling a temporary inverted arch of an existing tunnel with an underpass skew is applied to dismantling construction of the temporary inverted arch in a skew section generated by a built tunnel and the existing tunnel;
characterized in that the in-progress tunnel comprises a right-line A tunnel and a left-line B tunnel, the existing tunnel comprises a C tunnel and a D tunnel, the right-line A tunnel and the C tunnel intersect to generate a first intersection (21), the right-line A tunnel and the D tunnel intersect to generate a second intersection (22), the left-line B tunnel and the C tunnel intersect to generate a third intersection (23), the left-line B tunnel and the D tunnel intersect to generate a fourth intersection (24), the right-line A tunnel comprises a first demarcation point (11) and a second demarcation point (12), and the left-line B tunnel comprises a third demarcation point (13) and a fourth demarcation point (14);
-the first demarcation point (11) and the first intersection point (21) form a first demolition segment (31), -the first intersection point (21) and the second intersection point (22) form a second demolition segment (32), -the second intersection point (22) and the second demarcation point (12) form a third demolition segment (33);
-said third point of intersection (13) and said third point of intersection (23) constitute a fourth demolition segment (34), -said third point of intersection (23) and said fourth point of intersection (24) constitute a fifth demolition segment (35), -said fourth point of intersection (24) and said fourth point of intersection (14) constitute a sixth demolition segment (36);
the concrete dismantling steps are as follows:
s1: selecting a test section: after the primary support of the diagonal section is penetrated, selecting the first dismantling section (31) as a test section according to the dismantling direction of the tunnel under construction;
s2: dismantling a test section: gradually dismantling the test section in a sectional and fractional manner; if the dismantling result of the first test section is stable, the following steps are continuously executed:
and (3) the rest second dismantling section (32), the third dismantling section (33), the fourth dismantling section (34), the fifth dismantling section (35) and the sixth dismantling section (36) are dismantled according to the dismantling principle that the right line is dismantled first, the left line is dismantled later and the left line and the right line are staggered, and the dismantling work of all temporary inverted arches of the oblique crossing section is completed.
2. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew under the inclined tunnel according to claim 1, wherein the dismantling of the test section in the step S2 comprises the following steps:
1) dividing the test section into a test section (312) under the existing tunnel and a test section (311) obliquely under the existing tunnel;
2) spraying concrete for chiseling; the test section is dismantled in a grading and subsection mode according to the length of the one-time continuous breaking and chiseling sprayed concrete and the dismantling mode of the steel support in the test section, and the length of the one-time continuous breaking and chiseling sprayed concrete is carried out in the sequence from short to long;
3) dismantling the temporary steel support; after the test section finishes one-time continuous breaking and shotcrete breaking, the steel support starts to be dismantled within the time range of 12 hours, and the dismantling of the steel support comprises dismantling modes of 1 at intervals, 2 at intervals and 3 at intervals.
3. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew under according to the claim 2, wherein the length of the test section is 24m, the length of the test section (312) under the existing tunnel and the length of the test section (311) under the existing tunnel are 12m, and the length of the one-time continuous breaking and spraying concrete is divided into three sections of 2m, 4m and 6 m; and the angle of the skew between the built tunnel and the existing tunnel is less than 45 degrees.
4. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew downward according to claim 3, wherein the dismantling process of the test section (312) right below the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 1 at intervals, and if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 partition, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 2-1 partition; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled in the steel support dismantling mode of 1-2 partition, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling the concrete in the steel support dismantling mode of 1-3 partition, namely completing the dismantling work of the test section under the existing tunnel.
5. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew bottom according to claim 3, wherein the dismantling process of the test section (311) at the lower oblique side of the existing tunnel is as follows:
firstly, continuously chiseling concrete with the length of 2m at one time, judging whether a current jet section is stable, if so, dismantling by adopting a steel support dismantling mode of dismantling 2 at intervals, if not, immediately adding a support, and then shortening the length of the continuously chiseling jet concrete at one time;
after the steel support is dismantled in the steel support dismantling mode of 1-1 dismantling 2, judging whether the current dismantling result is stable, if so, continuously chiseling and spraying concrete with the length of 4m once, and dismantling the concrete support in the steel support dismantling mode of 1-3 dismantling; if the steel support is unstable, immediately reinforcing to stabilize the current test section, and reducing the number of the removed trusses for sequentially removing the steel supports after the steel support is stable;
and finally, after the steel support is dismantled at intervals of 1-3, judging whether the current dismantling result is stable, if so, continuously breaking and spraying concrete with the length of 6m at one time, and dismantling by adopting the steel support dismantling mode at intervals of 1-3 to complete the dismantling work of the test section obliquely below the existing tunnel.
6. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew under the inclined tunnel according to claim 2, wherein in the step 2), the injection is carried out by adopting a pneumatic pick and a manual mode.
7. The construction method for dismantling the temporary inverted arch of the existing tunnel with the downward-crossing skew angle as claimed in claim 2, wherein in the step 2), the reinforcing mesh is cut off at the same time, and the longitudinal connecting ribs are reserved.
8. The construction method for dismantling the temporary inverted arch of the existing tunnel with the downward-passing oblique crossing as claimed in claim 7, wherein the number of single cutting of the steel bar mesh in the longitudinal direction of the steel support is not more than 1.
9. The construction method for dismantling the temporary inverted arch of the existing tunnel passing through the skew under the inclined tunnel according to claim 2, wherein the dismantling mode further comprises a partition 2 dismantling mode and a partition 3 dismantling mode.
10. The construction method for the temporary inverted arch demolition of an existing tunnel passing through an oblique cross downwards according to claim 1, wherein the first demolition segment (31) is selected as a test segment, and after the test segment is demolished; selecting the fourth dismantling section (34) as a second test section, dismantling the second test section, selecting the second dismantling section (32) as a third test section, dismantling the third test section, selecting the fifth dismantling section (35) as a fourth test section, dismantling the fourth test section, selecting the third dismantling section (33) as a fifth test section, dismantling the fifth test section, and selecting the sixth dismantling section (36) as a sixth test section, dismantling the sixth test section;
the method for dismantling the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the method for dismantling the test sections.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167026A (en) * | 2023-11-03 | 2023-12-05 | 中交第一航务工程局有限公司 | Construction method for reverse roof-picking at intersection of inclined shaft work area of tunnel reconstruction and expansion section |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0274788A (en) * | 1988-09-12 | 1990-03-14 | Nakazawa Seisakusho:Kk | Drilling method for wall of vertical shaft and sealed device using therefor |
| CN101899977A (en) * | 2010-02-04 | 2010-12-01 | 上海隧道工程股份有限公司 | Ultra-shallow earth-covered subway shield traversing operation tunnel construction method of |
| CN104153800A (en) * | 2014-08-14 | 2014-11-19 | 中铁第一勘察设计院集团有限公司 | Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof |
| CN109653755A (en) * | 2019-01-03 | 2019-04-19 | 中铁隧道集团二处有限公司 | The construction method of ballastless track roadbed is passed through in a kind of sedimentation of major diameter slurry shield zero |
-
2020
- 2020-06-29 CN CN202010602558.2A patent/CN111764923B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0274788A (en) * | 1988-09-12 | 1990-03-14 | Nakazawa Seisakusho:Kk | Drilling method for wall of vertical shaft and sealed device using therefor |
| CN101899977A (en) * | 2010-02-04 | 2010-12-01 | 上海隧道工程股份有限公司 | Ultra-shallow earth-covered subway shield traversing operation tunnel construction method of |
| CN104153800A (en) * | 2014-08-14 | 2014-11-19 | 中铁第一勘察设计院集团有限公司 | Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof |
| CN109653755A (en) * | 2019-01-03 | 2019-04-19 | 中铁隧道集团二处有限公司 | The construction method of ballastless track roadbed is passed through in a kind of sedimentation of major diameter slurry shield zero |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167026A (en) * | 2023-11-03 | 2023-12-05 | 中交第一航务工程局有限公司 | Construction method for reverse roof-picking at intersection of inclined shaft work area of tunnel reconstruction and expansion section |
| CN117167026B (en) * | 2023-11-03 | 2024-01-23 | 中交第一航务工程局有限公司 | Construction method for reverse roof-picking at intersection of inclined shaft work area of tunnel reconstruction and expansion section |
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