CN105275483A - City bifurcation tunnel long span-arch section auxiliary mining support structure and mining method - Google Patents
City bifurcation tunnel long span-arch section auxiliary mining support structure and mining method Download PDFInfo
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- CN105275483A CN105275483A CN201510770228.3A CN201510770228A CN105275483A CN 105275483 A CN105275483 A CN 105275483A CN 201510770228 A CN201510770228 A CN 201510770228A CN 105275483 A CN105275483 A CN 105275483A
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Abstract
The invention discloses a city bifurcation tunnel long span-arch section auxiliary mining support structure, which comprises a first lining and a second lining. The first lining and the second lining are successively laid on the inner wall of a tunnel. The structure further comprises a plurality of support parts that are supported inside the tunnel while being vertical to the horizontal plane. The support parts are fixed onto the first lining and the second lining via a first longitudinal beam and a second longitudinal beam. The invention further discloses a city bifurcation tunnel long span-arch section mining method. According to the technical scheme of the invention, the problem in the prior art that city bifurcation tunnel long span-arch section linings are poor in structure security and large in construction difficulty can be solved. Meanwhile, the safety of the support structure is effectively improved, and the stratum settlement is controlled. The long-term stability is maintained.
Description
Technical field
The present invention relates to field of civil engineering, particularly relate to a kind of city offspur tunnel large arch section lining cutting type structure and excavation method.
Background technology
For alleviating the traffic jam issue become increasingly conspicuous, the ground in the domestic line city being representative with Beijing and Shanghai get down the highway (also known as Impacts Evaluation of Urban Tunnel) be about to welcome upsurge in construction, will produce as a large amount of offspur tunnels connecting itself and traffic above-ground tie thereupon.The offspur tunnel combination tunnel pattern that to be a class be made up of jointly the section of arch, arcading section and small interval section greatly, multibreak on its Alignment Design, multiple dimensioned and working procedure and country rock load frequent transitions feature causes its excavation supporting system in complex stress space, to show as a difficulty from value-added system.Offspur tunnel is a kind of novel tunnel structural shape, and there is no corresponding design, construction technique normalizing and standard at present can follow, and builds up at home and the example come into operation few.And compared with the offspur tunnel of the mountain ridge, Impacts Evaluation of Urban Tunnel offspur tunnel has section and structure is more complicated, the features such as the poorer and ambient influnence sensitiveness of geological conditions is stronger.
Large arch section is ingredient important in this structural shape of Impacts Evaluation of Urban Tunnel offspur tunnel, and has the excavated section feature of super large, and surrouding rock stress change and country rock and structural interaction relation complexity, and have following characteristics:
(1) large arch section tunnel cross-section size is large, and due to poor at tunnel exit place soil condition, causes clear distance between common hole substantially can not reach the requirement of minimum clear distance, so the tunnel creating large span is often this situation of small-clear-distance tunnel;
(2) large arch section tunnel cross-section area is large, and with regard to hole four lane road tunnel of soliciting orders, net sectional area is all greater than 220m usually
2.When number of track-lines increases time, tunnel excavation span also increases thereupon, in work progress, if when adopting general Double-lane highway tunnel method for designing design section, will cause larger space waste, the utilization rate of section can decrease, and construction can be caused to a certain extent uneconomical, therefore, large arch section tunnel generally can be designed to flat pattern;
(3) in weak surrounding rock, large arch section constructing tunnel process will take the mode of partial excavation due to the larger feature of section.When wall rock condition is good, work progress, by control disturbance, can not adopt onepull then to carry out the method for full face excavation substantially, therefore will take complicated working procedure and method.So more need to pay attention to constructional mechanical effect impact in large arch section constructing tunnel process, thus work out comparatively reasonably construction sequence.
Due to the mechanical characteristic of the section of arch tunnel complexity greatly, the geological environment of adding construction of tunnel is also very complicated, therefore in design and work progress, does not have unified specification.And, the research of the aspects such as large arch section tunnel cross-section form, liner structure parameter and construction technology is also fewer, the case history that can use for reference is also few, design and convert there is no clear and definite experience and can follow, the numerical value such as numerical simulation, network analysis and theoretical research also not deeply, also have a lot of critical problems demand to solve.Therefore, carry out the mechanical characteristics research of the large arch section of offspur tunnel in stratum, city, will provide fundamental basis for the formulation of support structure design parameter, there is the important and meaning of reality.
Tunnel flat ratio refers to the ratio of tunnel height and span.Tunnel is when cross dimensions designs, on the basis ensureing track clearance, reduce spring of arch as far as possible, reduce the unnecessary headroom of more than gauge, reduce soil excavation, and then save construction costs, now need to reduce flat ratio, but the reduction of flat ratio can cause Tunnel Stability to reduce, and structure stress is more unfavorable, brings potential safety hazard.Therefore, how while guarantee structural safety, to reduce construction costs, select suitable flat ratio then to become the emphasis of research.
Basic mechanical characteristic that is flat, large section tunnel may be summarized to be: (1) large section tunnel shows as a flat arch structure on geometric properties, can be similar to and regard ellipse as when carrying out mechanical characteristic analysis; (2) span and cross-sectional area strengthen, and stresses re-distribution is tending towards unfavorable; (3) arch springing place stress is concentrated, and needs higher bearing capacity of foundation soil; (4) vault poor stability; (5) relaxation pressure is larger; (6) supporting and protection structure bearing capacity is less.Flat ratio is the large problem existed in Practical Project, and flat ratio is excessive, safety issue, and lining cutting is blocked up, also uneconomical; Flat ratio is too small, and excavation area is excessive, uneconomical.
Therefore, need to provide a kind of novel method for digging, to meet the demand of the safety of super-span compressed tunnel supporting and protection structure.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of city offspur tunnel large arch section assisted mining braced structures and method for digging, to solve not enough in the safety of city offspur tunnel large arch section liner structure and that difficulty of construction is large problem.
For solving the problems of the technologies described above, the present invention adopts following technical proposals:
A kind of city offspur tunnel large arch section assisted mining braced structures, this structure comprises and is laid on the first lining cutting on tunnel inner wall and the second lining cutting successively;
This structure comprises the multiple support portions being supported on tunnel internal perpendicular to horizontal plane further, and described support portion is fixed in the first lining cutting and the second lining cutting by the first longeron and the second longeron.
Preferably, described first lining cutting is sprayed mortar, and the second lining cutting is that mould builds steel concrete.
Preferably, described support portion is reinforced concrete pipe column.
Preferably, described braced structures comprises the multiple temporary support portions for assisting described first lining cutting, the second lining cutting and multiple support portion to support the tunnel structure newly excavated further.
Preferably, described temporary support portion is sprayed mortar and the bracing frame of embedded I-shaped shaped steel.
A kind of city offspur tunnel large arch section method for digging, the step of the method comprises
S1, sectional view based on the tunnel blueprint designed in advance, first pilot tunnel in a through tunnel is dug in the position of the near top in this tunnel, and lay the first lining cutting in the part that the inwall of this first pilot tunnel overlaps with tunnel inner wall, other inner wall section of this first pilot tunnel lays temporary support portion, forms closed-loop at the first pilot tunnel inwall;
S2, in described tunnel with the tunnel bottom of the first pilot tunnel symmetric position near position dig second pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of this second pilot tunnel overlaps with tunnel inner wall, other inner wall section of this second pilot tunnel lays temporary support portion, forms closed-loop at the second pilot tunnel inwall;
S3, apply bored pile every a segment distance to the second pilot tunnel in the bottom of the first pilot tunnel, the top of this pile body is fixed on the first substrate in the first pilot tunnel by the first longeron, the bottom of this pile body is fixed on the first substrate in the second pilot tunnel by the second longeron;
The first half in the space between 1/3rd places of the spacing of S4, left side wall in described tunnel and described pile body and left side wall digs the 3rd pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 3rd pilot tunnel overlaps with tunnel inner wall, other inner wall section of 3rd pilot tunnel lays temporary support portion, forms closed-loop at the 3rd pilot tunnel inwall;
The latter half in the space between 1/3rd places of the spacing of S5, left side wall in described tunnel and described pile body and left side wall digs the 4th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 4th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 4th pilot tunnel lays temporary support portion, forms closed-loop at the 4th pilot tunnel inwall;
The first half in the space between 1/3rd places of the spacing of S6, right side wall in described tunnel and described pile body and right side wall digs the 5th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 5th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 5th pilot tunnel lays temporary support portion, forms closed-loop at the 5th pilot tunnel inwall;
The latter half in the space between 1/3rd places of the spacing of S7, right side wall in described tunnel and described pile body and right side wall digs the 6th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 6th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 6th pilot tunnel lays temporary support portion, forms closed-loop at the 6th pilot tunnel inwall;
The 7th pilot tunnel in a through tunnel is dug in space between 1/2nd places of the spacing of S8, described pile body in described tunnel and the 3rd pilot tunnel and the 3rd pilot tunnel, and lay the first lining cutting in the part that the inwall of the 7th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 7th pilot tunnel lays temporary support portion, forms closed-loop at the 7th pilot tunnel inwall;
The 8th pilot tunnel in a through tunnel is dug in space between 1/2nd places of the spacing of S9, described pile body in described tunnel and the 4th pilot tunnel and the 4th pilot tunnel, and lay the first lining cutting in the part that the inwall of the 8th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 8th pilot tunnel lays temporary support portion, forms closed-loop at the 8th pilot tunnel inwall;
Space between S10, described pile body in described tunnel and the 5th pilot tunnel, and remove the temporary support portion of the first pilot tunnel in this space and the first pilot tunnel overlapping space, dig the 9th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 9th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 9th pilot tunnel lays temporary support portion, forms closed-loop at the 9th pilot tunnel inwall;
Space between S11, described pile body in described tunnel and the 6th pilot tunnel, and remove the temporary support portion of the second pilot tunnel in this space and the second pilot tunnel overlapping space, dig the tenth pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the tenth pilot tunnel overlaps with tunnel inner wall, other inner wall section of tenth pilot tunnel lays temporary support portion, forms closed-loop at the tenth pilot tunnel inwall;
Space between S12, described pile body in described tunnel and the 7th pilot tunnel, and remove the temporary support portion of the first pilot tunnel in this space and the first pilot tunnel overlapping space, dig the 11 pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 11 pilot tunnel overlaps with tunnel inner wall, other inner wall section of 11 pilot tunnel lays temporary support portion, forms closed-loop at the 11 pilot tunnel inwall;
Space between S13, described pile body in described tunnel and the 8th pilot tunnel, and remove the temporary support portion of the second pilot tunnel in this space and the second pilot tunnel overlapping space, dig the 12 pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 12 pilot tunnel overlaps with tunnel inner wall, other inner wall section of 12 pilot tunnel lays temporary support portion, forms closed-loop at the 12 pilot tunnel inwall;
S14, remove all temporary support portions, first lining cutting covers and fixes the second lining cutting, and after the second lining cutting performs, remove all temporary support of first floor lining cutting, only retain stanchion as the permanent support in tunnel, complete the excavation of final offspur tunnel large arch section section.
Preferably, described pile body is the concrete stanchion that outer wrap steel pipe is gone along with sb. to guard him.
Beneficial effect of the present invention is as follows:
Technical scheme of the present invention solves not enough in the safety of city offspur tunnel large arch section liner structure and that difficulty of construction is large problem, effectively can improve the safety of supporting and protection structure, control stratum settlement, and maintain a long-term stability.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail;
Fig. 1 illustrates the schematic diagram of the section structure of city of the present invention offspur tunnel large arch section lining cutting type assisted mining braced structures;
Fig. 2 illustrates city of the present invention offspur tunnel large arch section section method for digging.
Drawing reference numeral
1, the first lining cutting, the 2, second lining cutting, the 3, first longeron, the 4, second longeron, 5, reinforced concrete pipe column, 6, temporary support portion.
Detailed description of the invention
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
As depicted in figs. 1 and 2, the invention discloses a kind of city offspur tunnel large arch section assisted mining braced structures, this structure comprises the first lining cutting 1 and the second lining cutting 2 be laid on successively on tunnel inner wall, and described first lining cutting 1 is sprayed mortar, and the second lining cutting 2 builds steel concrete for mould; This structure comprises the multiple support portions being supported on tunnel internal perpendicular to horizontal plane further, and described support portion is fixed in the first lining cutting and the second lining cutting by the first longeron 3 and the second longeron 4, and described support portion is reinforced concrete pipe column 5.In this programme, described braced structures comprises the multiple temporary support portions 6 for assisting described first lining cutting, the second lining cutting and multiple support portion to support the tunnel structure newly excavated further, and described temporary support portion is sprayed mortar and the reinforced concrete support frame of embedded I-shaped shaped steel.
As shown in Figure 2, the present invention further discloses a kind of city offspur tunnel large arch section method for digging, the step of the method comprises
S1, sectional view based on the tunnel blueprint designed in advance, first pilot tunnel I in a through tunnel is dug in the position of the near top in this tunnel, and lay the first lining cutting 1 in the part that the inwall of this first pilot tunnel I overlaps with tunnel inner wall, other inner wall section of this first pilot tunnel I lays temporary support portion 6, forms closed-loop at the first pilot tunnel I inwall;
S2, in described tunnel with the tunnel bottom of the first pilot tunnel I symmetric position near position dig second pilot tunnel II in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of this second pilot tunnel II overlaps with tunnel inner wall, other inner wall section of this second pilot tunnel II lays temporary support portion 6, forms closed-loop at the second pilot tunnel II inwall;
S3, apply bored pile every a segment distance to the second pilot tunnel II in the bottom of the first pilot tunnel I, the top of this pile body is fixed on the first substrate 1 in the first pilot tunnel I by the first longeron 3, the bottom of this pile body is fixed on the first substrate 1 in the second pilot tunnel II by the second longeron 4; Described pile body is the reinforced concrete pipe column 5 that outer wrap steel pipe is gone along with sb. to guard him;
The first half in the space between 1/3rd places of the spacing of S4, left side wall in described tunnel and described pile body and left side wall digs the 3rd pilot tunnel III in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 3rd pilot tunnel III overlaps with tunnel inner wall, other inner wall section of 3rd pilot tunnel III lays temporary support portion 6, forms closed-loop at the 3rd pilot tunnel III inwall;
The latter half in the space between 1/3rd places of the spacing of S5, left side wall in described tunnel and described pile body and left side wall digs the 4th pilot tunnel IV in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 4th pilot tunnel IV overlaps with tunnel inner wall, other inner wall section of 4th pilot tunnel IV lays temporary support portion 6, forms closed-loop at the 4th pilot tunnel IV inwall;
The first half in the space between 1/3rd places of the spacing of S6, right side wall in described tunnel and described pile body and right side wall digs the 5th pilot tunnel V in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 5th pilot tunnel V overlaps with tunnel inner wall, other inner wall section of 5th pilot tunnel V lays temporary support portion 6, forms closed-loop at the 5th pilot tunnel V inwall;
The latter half in the space between 1/3rd places of the spacing of S7, right side wall in described tunnel and described pile body and right side wall digs the 6th pilot tunnel VI in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 6th pilot tunnel VI overlaps with tunnel inner wall, other inner wall section of 6th pilot tunnel VI lays temporary support portion 6, forms closed-loop at the 6th pilot tunnel VI inwall;
The 7th pilot tunnel VII in a through tunnel is dug in space between 1/2nd places of the spacing of S8, described pile body in described tunnel and the 3rd pilot tunnel III and the 3rd pilot tunnel III, and lay the first lining cutting 1 in the part that the inwall of the 7th pilot tunnel VII overlaps with tunnel inner wall, other inner wall section of 7th pilot tunnel VII lays temporary support portion 6, forms closed-loop at the 7th pilot tunnel VII inwall;
The 8th pilot tunnel VIII in a through tunnel is dug in space between 1/2nd places of the spacing of S9, described pile body in described tunnel and the 4th pilot tunnel IV and the 4th pilot tunnel IV, and lay the first lining cutting 1 in the part that the inwall of the 8th pilot tunnel VIII overlaps with tunnel inner wall, other inner wall section of 8th pilot tunnel VIII lays temporary support portion 6, forms closed-loop at the 8th pilot tunnel VIII inwall;
Space between S10, described pile body in described tunnel and the 5th pilot tunnel V, and remove the temporary support portion 6 of the first pilot tunnel I in this space and the first pilot tunnel I overlapping space, dig the 9th pilot tunnel Ⅸ in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 9th pilot tunnel Ⅸ overlaps with tunnel inner wall, other inner wall section of 9th pilot tunnel Ⅸ lays temporary support portion 6, forms closed-loop at the 9th pilot tunnel Ⅸ inwall;
Space between S11, described pile body in described tunnel and the 6th pilot tunnel VI, and remove the temporary support portion 6 of the second pilot tunnel II in this space and the second pilot tunnel II overlapping space, dig the tenth pilot tunnel Ⅹ in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the tenth pilot tunnel Ⅹ overlaps with tunnel inner wall, other inner wall section of tenth pilot tunnel Ⅹ lays temporary support portion 6, forms closed-loop at the tenth pilot tunnel Ⅹ inwall;
Space between S12, described pile body in described tunnel and the 7th pilot tunnel VII, and remove the temporary support portion 6 of the first pilot tunnel I in this space and the first pilot tunnel I overlapping space, dig the 11 pilot tunnel Ⅺ in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 11 pilot tunnel Ⅺ overlaps with tunnel inner wall, other inner wall section of 11 pilot tunnel Ⅺ lays temporary support portion 6, forms closed-loop at the 11 pilot tunnel Ⅺ inwall;
Space between S13, described pile body in described tunnel and the 8th pilot tunnel VIII, and remove the temporary support portion 6 of the second pilot tunnel II in this space and the second pilot tunnel II overlapping space, dig the 12 pilot tunnel Ⅻ in a through tunnel, and lay the first lining cutting 1 in the part that the inwall of the 12 pilot tunnel Ⅻ overlaps with tunnel inner wall, other inner wall section of 12 pilot tunnel Ⅻ lays temporary support portion 6, forms closed-loop at the 12 pilot tunnel Ⅻ inwall;
S14, remove all temporary support 6, the first lining cutting 1 covers and fixes the second lining cutting 2, complete the excavation of final offspur tunnel large arch section section.
Below by one group of embodiment, the present invention will be further described:
As depicted in figs. 1 and 2, the lining cutting type braced structures of the large arch section of city of the present invention offspur tunnel comprises the first lining cutting 1, second lining cutting 2, first longeron 3, second longeron 4, concrete steel tubing string 5 and temporary support portion 6.Concrete steel tubing string 5 couples together by the second longeron 4 utilizing the first longeron 3 of tunnel top and the end to indulge.First longeron 3 of concrete steel tubing string 5, tunnel top and the second longeron of tunnel bottom can provide the vertical supporting effectively realizing tunnel, and jointly form carrying system with the first lining cutting 1 and the second lining cutting 2.Adopt city of the present invention offspur tunnel large arch section lining structure type can improve supporting and protection structure bearing capacity, strengthen the safety of supporting and protection structure, thus reduce flat ratio, reduce excavated section and amass, improve economy.
As shown in Figure 2, for effectively controlling the distortion of offspur tunnel large arch section peripheral rock and top ground settlement, large for offspur tunnel arch section is divided into 12 parts as shown in Figure 2, according to Cheng Huan step by step and the principle closed in time, adopt the method for step excavation, often complete once to excavate and just carry out closing into ring, Specific construction step is as follows:
Step one: first excavate the first pilot tunnel I, forms narrow-bore tunnel excavation, then applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 2: while excavating the first pilot tunnel I, carries out excavation second pilot tunnel II, then applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carries out closing into ring;
Step 3: excavate into after ring completes at the first pilot tunnel I and the second pilot tunnel II, apply reinforced concrete pipe column 5, first the first longeron 3 of tunnel top and the second longeron 4 of tunnel bottom is applied, then bored pile is applied from the first pilot tunnel I, connect with the first longeron of tunnel top on top, then get through the second longeron 4 place reaching the second pilot tunnel II to tunnel bottom, finally go along with sb. to guard him with steel pipe outside concrete;
Step 4: excavation the 3rd pilot tunnel III, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 5: excavation the 4th pilot tunnel IV, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 6: excavation the 5th pilot tunnel V, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 7: excavation the 6th pilot tunnel VI, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 8: excavation the 7th pilot tunnel VII, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 9: excavation the 8th pilot tunnel VIII, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 10: excavation the 9th pilot tunnel Ⅸ, removes temporary support portion 6 on the right side of the first pilot tunnel I of top, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 11: excavation the tenth pilot tunnel Ⅹ, removes temporary support portion 6 on the right side of the second pilot tunnel II of below, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 12: excavation the 11 pilot tunnel Ⅺ, removes temporary support portion 6 on the left of the first pilot tunnel I of top, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 13: excavation the 12 pilot tunnel Ⅻ, removes temporary support portion 6 on the left of the second pilot tunnel II of below, applies the first lining cutting 1 and the temporary support portion 6 of preliminary bracing, carry out closing into ring;
Step 14: remove all temporary support 6, applies the second lining cutting 2, completes final offspur tunnel large arch section section liner structure.
In sum, technical scheme of the present invention solves not enough in the safety of city offspur tunnel large arch section liner structure and that difficulty of construction is large problem, effectively can improve the safety of supporting and protection structure, control stratum settlement, and maintain a long-term stability.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (7)
1. a city offspur tunnel large arch section assisted mining braced structures, is characterized in that, this structure comprises and is laid on the first lining cutting on tunnel inner wall and the second lining cutting successively;
This structure comprises the multiple support portions being supported on tunnel internal perpendicular to horizontal plane further, and described support portion is fixed in the first lining cutting and the second lining cutting by the first longeron and the second longeron.
2. braced structures according to claim 1, is characterized in that, described first lining cutting is sprayed mortar, and the second lining cutting is that mould builds steel concrete.
3. braced structures according to claim 1, is characterized in that, described support portion is reinforced concrete pipe column.
4. braced structures according to claim 1, is characterized in that, described braced structures comprises the multiple temporary support portions for assisting described first lining cutting, the second lining cutting and multiple support portion to support the tunnel structure newly excavated further.
5. braced structures according to claim 1, is characterized in that, described temporary support portion is sprayed mortar and the bracing frame of embedded I-shaped shaped steel.
6. a city offspur tunnel large arch section method for digging, is characterized in that, the step of the method comprises
S1, sectional view based on the tunnel blueprint designed in advance, first pilot tunnel in a through tunnel is dug in the position of the near top in this tunnel, and lay the first lining cutting in the part that the inwall of this first pilot tunnel overlaps with tunnel inner wall, other inner wall section of this first pilot tunnel lays temporary support portion, forms closed-loop at the first pilot tunnel inwall;
S2, in described tunnel with the tunnel bottom of the first pilot tunnel symmetric position near position dig second pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of this second pilot tunnel overlaps with tunnel inner wall, other inner wall section of this second pilot tunnel lays temporary support portion, forms closed-loop at the second pilot tunnel inwall;
S3, apply bored pile every a segment distance to the second pilot tunnel in the bottom of the first pilot tunnel, the top of this pile body is fixed on the first substrate in the first pilot tunnel by the first longeron, the bottom of this pile body is fixed on the first substrate in the second pilot tunnel by the second longeron;
The first half in the space between 1/3rd places of the spacing of S4, left side wall in described tunnel and described pile body and left side wall digs the 3rd pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 3rd pilot tunnel overlaps with tunnel inner wall, other inner wall section of 3rd pilot tunnel lays temporary support portion, forms closed-loop at the 3rd pilot tunnel inwall;
The latter half in the space between 1/3rd places of the spacing of S5, left side wall in described tunnel and described pile body and left side wall digs the 4th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 4th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 4th pilot tunnel lays temporary support portion, forms closed-loop at the 4th pilot tunnel inwall;
The first half in the space between 1/3rd places of the spacing of S6, right side wall in described tunnel and described pile body and right side wall digs the 5th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 5th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 5th pilot tunnel lays temporary support portion, forms closed-loop at the 5th pilot tunnel inwall;
The latter half in the space between 1/3rd places of the spacing of S7, right side wall in described tunnel and described pile body and right side wall digs the 6th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 6th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 6th pilot tunnel lays temporary support portion, forms closed-loop at the 6th pilot tunnel inwall;
The 7th pilot tunnel in a through tunnel is dug in space between 1/2nd places of the spacing of S8, described pile body in described tunnel and the 3rd pilot tunnel and the 3rd pilot tunnel, and lay the first lining cutting in the part that the inwall of the 7th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 7th pilot tunnel lays temporary support portion, forms closed-loop at the 7th pilot tunnel inwall;
The 8th pilot tunnel in a through tunnel is dug in space between 1/2nd places of the spacing of S9, described pile body in described tunnel and the 4th pilot tunnel and the 4th pilot tunnel, and lay the first lining cutting in the part that the inwall of the 8th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 8th pilot tunnel lays temporary support portion, forms closed-loop at the 8th pilot tunnel inwall;
Space between S10, described pile body in described tunnel and the 5th pilot tunnel, and remove the temporary support portion of the first pilot tunnel in this space and the first pilot tunnel overlapping space, dig the 9th pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 9th pilot tunnel overlaps with tunnel inner wall, other inner wall section of 9th pilot tunnel lays temporary support portion, forms closed-loop at the 9th pilot tunnel inwall;
Space between S11, described pile body in described tunnel and the 6th pilot tunnel, and remove the temporary support portion of the second pilot tunnel in this space and the second pilot tunnel overlapping space, dig the tenth pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the tenth pilot tunnel overlaps with tunnel inner wall, other inner wall section of tenth pilot tunnel lays temporary support portion, forms closed-loop at the tenth pilot tunnel inwall;
Space between S12, described pile body in described tunnel and the 7th pilot tunnel, and remove the temporary support portion of the first pilot tunnel in this space and the first pilot tunnel overlapping space, dig the 11 pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 11 pilot tunnel overlaps with tunnel inner wall, other inner wall section of 11 pilot tunnel lays temporary support portion, forms closed-loop at the 11 pilot tunnel inwall;
Space between S13, described pile body in described tunnel and the 8th pilot tunnel, and remove the temporary support portion of the second pilot tunnel in this space and the second pilot tunnel overlapping space, dig the 12 pilot tunnel in a through tunnel, and lay the first lining cutting in the part that the inwall of the 12 pilot tunnel overlaps with tunnel inner wall, other inner wall section of 12 pilot tunnel lays temporary support portion, forms closed-loop at the 12 pilot tunnel inwall;
S14, remove all temporary support portions, first lining cutting covers and fixes the second lining cutting, and after the second lining cutting performs, remove all temporary support of first floor lining cutting, only retain stanchion as the permanent support in tunnel, complete the excavation of final offspur tunnel large arch section section.
7. braced structures according to claim 6, is characterized in that, described pile body is the concrete stanchion that outer wrap steel pipe is gone along with sb. to guard him.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770228.3A CN105275483B (en) | 2015-11-12 | 2015-11-12 | A kind of big arch section method for digging of city offspur tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770228.3A CN105275483B (en) | 2015-11-12 | 2015-11-12 | A kind of big arch section method for digging of city offspur tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105275483A true CN105275483A (en) | 2016-01-27 |
| CN105275483B CN105275483B (en) | 2017-11-03 |
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Cited By (4)
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| CN106894825A (en) * | 2017-03-20 | 2017-06-27 | 上海市政工程设计研究总院（集团）有限公司 | A kind of hidden digging structure of underground interchange offspur tunnel |
| CN107313790A (en) * | 2017-08-30 | 2017-11-03 | 中国电建集团中南勘测设计研究院有限公司 | A kind of symmetrical trouble hole supporting construction and its construction method |
| CN107630710A (en) * | 2017-11-09 | 2018-01-26 | 河南工程学院 | A kind of super large Varied section tunnel support structure |
| CN116128380A (en) * | 2023-04-13 | 2023-05-16 | 沧州路桥工程有限责任公司 | Bridge health monitoring method and device, electronic equipment and storage medium |
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| CN106894825A (en) * | 2017-03-20 | 2017-06-27 | 上海市政工程设计研究总院（集团）有限公司 | A kind of hidden digging structure of underground interchange offspur tunnel |
| CN107313790A (en) * | 2017-08-30 | 2017-11-03 | 中国电建集团中南勘测设计研究院有限公司 | A kind of symmetrical trouble hole supporting construction and its construction method |
| CN107630710A (en) * | 2017-11-09 | 2018-01-26 | 河南工程学院 | A kind of super large Varied section tunnel support structure |
| CN116128380A (en) * | 2023-04-13 | 2023-05-16 | 沧州路桥工程有限责任公司 | Bridge health monitoring method and device, electronic equipment and storage medium |
| CN116128380B (en) * | 2023-04-13 | 2023-06-30 | 沧州路桥工程有限责任公司 | Bridge health monitoring method and device, electronic equipment and storage medium |
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