CN105275483B - A kind of big arch section method for digging of city offspur tunnel - Google Patents
A kind of big arch section method for digging of city offspur tunnel Download PDFInfo
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- CN105275483B CN105275483B CN201510770228.3A CN201510770228A CN105275483B CN 105275483 B CN105275483 B CN 105275483B CN 201510770228 A CN201510770228 A CN 201510770228A CN 105275483 B CN105275483 B CN 105275483B
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Abstract
The invention discloses a kind of big arch section method for digging of city offspur tunnel, technical scheme of the present invention is solved the problem of offspur tunnel big arch section liner structure security in city is not enough big with difficulty of construction, the security of supporting construction can be effectively improved, stratum settlement is controlled, and is maintained a long-term stability.
Description
Technical field
The present invention relates to field of civil engineering, more particularly to a kind of big arch section method for digging of city offspur tunnel.
Background technology
It is public by the underground in the domestic line city of representative of Beijing and Shanghai to alleviate the traffic jam issue become increasingly conspicuous
Road (also known as Impacts Evaluation of Urban Tunnel) will welcome upsurge in construction, will as a large amount of offspur tunnels for connecting itself and traffic above-ground tie
Produce therewith.Offspur tunnel is a class by encircleing the combination tunnel pattern that section, arcading section and small interval section are collectively formed greatly, and its is linear
The characteristics of many sections, multiple dimensioned and working procedure in design and country rock load frequent transitions, causes its excavation supporting system multiple
A difficulty is shown as in miscellaneous stress-space from value-added system.Offspur tunnel is a kind of novel tunnel structural shape, be there is no at present
Corresponding design, construction technique normalizing and standard can be followed, and the example for building up and coming into operation at home is simultaneously few.And and the mountain ridge
Offspur tunnel is compared, and Impacts Evaluation of Urban Tunnel offspur tunnel has section and structure more complicated, and geological conditions is worse and environment shadow
Ring the features such as sensitiveness is stronger.
Big arch section is important part in Impacts Evaluation of Urban Tunnel offspur tunnel this structural shape, and with super large
Excavated section feature, surrouding rock stress change and country rock and structural interaction relation are complicated, and have the characteristics that：
(1) big arch section tunnel cross-section size is big, and due at tunnel exit soil condition it is poor, cause common hole
Between clear distance can not substantially reach the requirement of minimum clear distance, then generating the tunnel of large span, to be often small-clear-distance tunnel this
Situation；
(2) big arch section tunnel cross-section area is big, and for hole four lane road tunnel of soliciting orders, net sectional area is generally all big
In 220m2.When number of track-lines increase, tunnel excavation span also increases therewith, in work progress, if using general double
During lane road Tunnel Design method design section, it will cause larger space waste, the utilization rate of section can be decreased,
Construction can be caused uneconomical for a certain extent, therefore, big arch section tunnel can generally be designed to flat pattern；
(3) in weak surrounding rock, big arch section constructing tunnel process will take branch to open due to the larger feature of section
The mode of digging.When wall rock condition is preferable, work progress using onepull and then will not substantially enter control disturbance
The method of row full face tunneling, therefore the working procedure and method of complexity will be taken.So in arch section constructing tunnel process greatly
In more need pay attention to constructional mechanical effect influence, so as to work out relatively reasonable construction procedure.
Due to the mechanical characteristic that big arch section tunnel is complicated, along with the geological environment of Tunnel Engineering is also very complicated, therefore
There is no unified specification in design and work progress.Moreover, encircleing section tunnel cross-section form, liner structure parameter and construction work greatly
Research in terms of skill is also fewer, and the case history that can be used for reference is simultaneously few, and design there is no clear and definite experience to follow with management,
The numerical value such as numerical simulation, network analysis and theoretical research are not also goed deep into, and also have many critical problems demands to solve.Cause
This, carries out the mechanical characteristics research of the big arch section of offspur tunnel in the stratum of city, will be formulated for support structure design parameter and provide reason
By basis, with important and real meaning.
Tunnel flat ratio refers to tunnel height and the ratio of span.Tunnel is ensureing building limit when cross dimensions is designed
On the basis of boundary, reduce spring of arch as far as possible, reduce more than gauge unnecessary headroom, reduce earth excavation, and then save engineering and make
Valency, now needs to reduce flat ratio, but the reduction of flat ratio can cause Tunnel Stability to reduce, and structure stress is more unfavorable, band
Carry out potential safety hazard.Therefore, how construction costs is reduced while ensureing that structure is safe, selects suitable flat ratio then to turn into and grind
The emphasis studied carefully.
Flat, large section tunnel basic mechanical characteristic may be summarized to be：(1) large section tunnel is on geometric properties
A flat arch structure is shown as, carries out approximately regarding ellipse as during mechanical characteristic analysis；(2) span adds with cross-sectional area
Greatly, stresses re-distribution tends to be unfavorable；(3) at arch springing stress concentration, it is necessary to higher foundation bearing capacity；(4) vault stability is poor；
(5) relaxation pressure is larger；(6) supporting construction bearing capacity is smaller.Flat ratio is big problem, flat ratio mistake present in Practical Project
Greatly, safety issue, lining cutting is blocked up, also uneconomical；Flat ratio is too small, and excavation area is excessive, uneconomical.
Accordingly, it is desirable to provide a kind of new method for digging, to meet the safety of super-span compressed tunnel supporting construction
The demand of property.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of city offspur tunnel it is big arch section assisted mining supporting construction and
Method for digging, to solve the problem of offspur tunnel big arch section liner structure security in city is not enough big with difficulty of construction.
In order to solve the above technical problems, the present invention uses following technical proposals：
The step of a kind of big arch section method for digging of city offspur tunnel, this method, includes
S1, the sectional view based on the tunnel blueprint being pre-designed, an insertion is dug in the position of the near top in the tunnel
First pilot tunnel in tunnel, and lay the first lining cutting in the part that is overlapped with tunnel inner wall of inwall of first pilot tunnel, this first is led
Other inner wall sections laying temporary support portion in hole, in the first pilot tunnel inwall formation closed-loop；
S2, in the tunnel with the position near the tunnel bottom of the first pilot tunnel symmetric position dig an insertion tunnel
Second pilot tunnel, and lay in the part that is overlapped with tunnel inner wall of inwall of second pilot tunnel the first lining cutting, second pilot tunnel its
Its inner wall section laying temporary support portion, in the second pilot tunnel inwall formation closed-loop；
S3, in the bottom of the first pilot tunnel every a segment distance cast-in-situ bored pile is applied to the second pilot tunnel, the top of the pile body
It is fixed on by the first longeron on the first substrate in the first pilot tunnel, the bottom of the pile body is fixed on second by the second longeron and led
On the first substrate in hole；
S4, between the left side wall and the pile body in the tunnel distance 1/3rd at space between left side wall
Top half dig the 3rd pilot tunnel in an insertion tunnel, and spread in the part that is overlapped with tunnel inner wall of inwall of the 3rd pilot tunnel
If the first lining cutting, other inner wall sections laying temporary support portion of the 3rd pilot tunnel, in the 3rd pilot tunnel inwall formation closed-loop；
S5, between the left side wall and the pile body in the tunnel distance 1/3rd at space between left side wall
The latter half dig the 4th pilot tunnel in an insertion tunnel, and spread in the part that is overlapped with tunnel inner wall of inwall of the 4th pilot tunnel
If the first lining cutting, other inner wall sections laying temporary support portion of the 4th pilot tunnel, in the 4th pilot tunnel inwall formation closed-loop；
S6, between the right side wall and the pile body in the tunnel distance 1/3rd at space between right side wall
Top half dig the 5th pilot tunnel in an insertion tunnel, and spread in the part that is overlapped with tunnel inner wall of inwall of the 5th pilot tunnel
If the first lining cutting, other inner wall sections laying temporary support portion of the 5th pilot tunnel, in the 5th pilot tunnel inwall formation closed-loop；
S7, between the right side wall and the pile body in the tunnel distance 1/3rd at space between right side wall
The latter half dig the 6th pilot tunnel in an insertion tunnel, and spread in the part that is overlapped with tunnel inner wall of inwall of the 6th pilot tunnel
If the first lining cutting, other inner wall sections laying temporary support portion of the 6th pilot tunnel, in the 6th pilot tunnel inwall formation closed-loop；
S8, between the pile body and the 3rd pilot tunnel in the tunnel distance 1/2nd between the 3rd pilot tunnel
The 7th pilot tunnel in an insertion tunnel is dug in space, and lays first in the part that is overlapped with tunnel inner wall of inwall of the 7th pilot tunnel
Lining cutting, other inner wall sections laying temporary support portion of the 7th pilot tunnel, in the 7th pilot tunnel inwall formation closed-loop；
S9, between the pile body and the 4th pilot tunnel in the tunnel distance 1/2nd between the 4th pilot tunnel
The 8th pilot tunnel in an insertion tunnel is dug in space, and lays first in the part that is overlapped with tunnel inner wall of inwall of the 8th pilot tunnel
Lining cutting, other inner wall sections laying temporary support portion of the 8th pilot tunnel, in the 8th pilot tunnel inwall formation closed-loop；
S10, the space between the pile body and the 5th pilot tunnel in the tunnel, and remove the space and the first pilot tunnel weight
The temporary support portion of the first pilot tunnel in folded space, digs the 9th pilot tunnel in an insertion tunnel, and in the inwall of the 9th pilot tunnel
The first lining cutting is laid in the part that is overlapped with tunnel inner wall, other inner wall sections laying temporary support portion of the 9th pilot tunnel, the
Nine pilot tunnel inwalls formation closed-loop；
S11, the space between the pile body and the 6th pilot tunnel in the tunnel, and remove the space and the second pilot tunnel weight
The temporary support portion of the second pilot tunnel in folded space, digs the tenth pilot tunnel in an insertion tunnel, and in the inwall of the tenth pilot tunnel
The first lining cutting is laid in the part that is overlapped with tunnel inner wall, other inner wall sections laying temporary support portion of the tenth pilot tunnel, the
Ten pilot tunnel inwalls formation closed-loop；
S12, the space between the pile body and the 7th pilot tunnel in the tunnel, and remove the space and the first pilot tunnel weight
The temporary support portion of the first pilot tunnel in folded space, digs the 11st pilot tunnel in an insertion tunnel, and in the 11st pilot tunnel
Lay the first lining cutting, other inner wall sections laying temporary support of the 11st pilot tunnel in the part that inwall is overlapped with tunnel inner wall
Portion, in the 11st pilot tunnel inwall formation closed-loop；
S13, the space between the pile body and the 8th pilot tunnel in the tunnel, and remove the space and the second pilot tunnel weight
The temporary support portion of the second pilot tunnel in folded space, digs the 12nd pilot tunnel in an insertion tunnel, and in the 12nd pilot tunnel
Lay the first lining cutting, other inner wall sections laying temporary support of the 12nd pilot tunnel in the part that inwall is overlapped with tunnel inner wall
Portion, in the 12nd pilot tunnel inwall formation closed-loop；
S14, all temporary support portions of dismounting, the second lining cutting is fixed in covering in the first lining cutting, and is performed in the second lining cutting
All temporary supports of first layer lining cutting are removed afterwards, are only retained stanchion as the permanent support in tunnel, are completed final offspur tunnel
The excavation of big arch section section.
It is preferred that, the pile body is the concrete stanchion that outer wrap steel pipe is gone along with sb. to guard him.
Beneficial effects of the present invention are as follows：
Technical scheme of the present invention is solved in the big arch section liner structure security deficiency of city offspur tunnel and construction
The problem of difficulty is big, can effectively improve the security of supporting construction, control stratum settlement, and maintain a long-term stability.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings；
Fig. 1 shows the section structure of the big arch section lining cutting type assisted mining supporting construction of city offspur tunnel of the present invention
Schematic diagram；
Fig. 2 shows the big arch section section method for digging of city offspur tunnel of the present invention.
Drawing reference numeral
1st, the first lining cutting, the 2, second lining cutting, the 3, first longeron, the 4, second longeron, 5, reinforced concrete pipe column, 6, interim branch
Support part.
Embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As depicted in figs. 1 and 2, should the invention discloses a kind of big arch section assisted mining supporting construction of city offspur tunnel
Structure includes the first lining cutting 1 and the second lining cutting 2 being laid on successively on tunnel inner wall, and first lining cutting 1 is gunite concrete,
Second lining cutting 2 is that mould builds armored concrete；The structure further comprises multiple that tunnel internal is supported on perpendicular to horizontal plane
Support part, the supporting part is fixed in the first lining cutting and the second lining cutting by the first longeron 3 and the second longeron 4, the supporting part
For reinforced concrete pipe column 5.In this programme, the supporting construction further comprises being used to assist first lining cutting, the second lining
The multiple temporary support portions 6 being supported with multiple supporting parts to the tunnel structure newly excavated are built, the temporary support portion is
Gunite concrete and the reinforced concrete support frame for embedding I-shaped shaped steel.
As shown in Fig. 2 the present invention further discloses a kind of big arch section method for digging of city offspur tunnel, the step of this method
Suddenly include
S1, the sectional view based on the tunnel blueprint being pre-designed, an insertion is dug in the position of the near top in the tunnel
First pilot tunnel I in tunnel, and the first lining cutting 1 is laid in the part that is overlapped with tunnel inner wall of inwall of first pilot tunnel I, this first
Other inner wall sections laying temporary support portion 6 of pilot tunnel I, in the inwall of the first pilot tunnel I formation closed-loop；
S2, in the tunnel near the tunnel bottom of the symmetric position of the first pilot tunnel I position dig an insertion tunnel
The second pilot tunnel II, and lay the first lining cutting 1 in the part that is overlapped with tunnel inner wall of inwall of second pilot tunnel II, this second is led
Other inner wall sections laying temporary support portion 6 in hole II, in the inwall of the second pilot tunnel II formation closed-loop；
S3, in the bottom of the first pilot tunnel I every a segment distance cast-in-situ bored pile is applied to the second pilot tunnel II, the top of the pile body
Portion is fixed on the first substrate 1 in the first pilot tunnel I by the first longeron 3, and the bottom of the pile body is fixed on by the second longeron 4
On the first substrate 1 in second pilot tunnel II；The pile body is the reinforced concrete pipe column 5 that outer wrap steel pipe is gone along with sb. to guard him；
S4, between the left side wall and the pile body in the tunnel distance 1/3rd at space between left side wall
Top half dig the 3rd pilot tunnel III in an insertion tunnel, and in the portion that is overlapped with tunnel inner wall of inwall of the 3rd pilot tunnel III
Divide laying the first lining cutting 1, other inner wall sections laying temporary support portion 6 of the 3rd pilot tunnel III, in the inwall shape of the 3rd pilot tunnel III
Into closed-loop；
S5, between the left side wall and the pile body in the tunnel distance 1/3rd at space between left side wall
The latter half dig the 4th pilot tunnel IV in an insertion tunnel, and in the portion that is overlapped with tunnel inner wall of inwall of the 4th pilot tunnel IV
Divide laying the first lining cutting 1, other inner wall sections laying temporary support portion 6 of the 4th pilot tunnel IV, in the inwall shape of the 4th pilot tunnel IV
Into closed-loop；
S6, between the right side wall and the pile body in the tunnel distance 1/3rd at space between right side wall
Top half dig the 5th pilot tunnel V in an insertion tunnel, and in the portion that is overlapped with tunnel inner wall of inwall of the 5th pilot tunnel V
Divide laying the first lining cutting 1, other inner wall sections laying temporary support portion 6 of the 5th pilot tunnel V, in the inwall shape of the 5th pilot tunnel V
Into closed-loop；
S7, between the right side wall and the pile body in the tunnel distance 1/3rd at space between right side wall
The latter half dig the 6th pilot tunnel VI in an insertion tunnel, and in the portion that is overlapped with tunnel inner wall of inwall of the 6th pilot tunnel VI
Divide laying the first lining cutting 1, other inner wall sections laying temporary support portion 6 of the 6th pilot tunnel VI, in the inwall shape of the 6th pilot tunnel VI
Into closed-loop；
S8, between the pile body and the 3rd pilot tunnel III in the tunnel distance 1/2nd at and the 3rd pilot tunnel III it
Between space dig the 7th pilot tunnel VII in an insertion tunnel, and in the part that is overlapped with tunnel inner wall of inwall of the 7th pilot tunnel VII
The first lining cutting 1 is laid, other inner wall sections laying temporary support portion 6 of the 7th pilot tunnel VII is formed in the inwall of the 7th pilot tunnel VII
Closed-loop；
S9, between the pile body and the 4th pilot tunnel IV in the tunnel distance 1/2nd at and the 4th pilot tunnel IV it
Between space dig the 8th pilot tunnel VIII in an insertion tunnel, and in the part that is overlapped with tunnel inner wall of inwall of the 8th pilot tunnel VIII
The first lining cutting 1 is laid, other inner wall sections laying temporary support portion 6 of the 8th pilot tunnel VIII is formed in the inwall of the 8th pilot tunnel VIII
Closed-loop；
S10, the space between the pile body and the 5th pilot tunnel V in the tunnel, and remove the space and the first pilot tunnel
The temporary support portion 6 of the first pilot tunnel I in I overlapping space, digs the 9th pilot tunnel Ⅸ in an insertion tunnel, and in the 9th pilot tunnel
The first lining cutting 1 is laid in the part that Ⅸ inwall is overlapped with tunnel inner wall, and other inner wall sections laying of the 9th pilot tunnel Ⅸ is interim
Supporting part 6, in the inwall of the 9th pilot tunnel Ⅸ formation closed-loop；
S11, the space between the pile body and the 6th pilot tunnel VI in the tunnel, and remove the space and the second pilot tunnel
The temporary support portion 6 of the second pilot tunnel II in II overlapping space, digs the tenth pilot tunnel Ⅹ in an insertion tunnel, and is led the tenth
The first lining cutting 1 is laid in the part that the inwall in hole Ⅹ is overlapped with tunnel inner wall, and other inner wall sections laying of the tenth pilot tunnel Ⅹ is faced
When supporting part 6, the inwall of the tenth pilot tunnel Ⅹ formation closed-loop；
S12, the space between the pile body and the 7th pilot tunnel VII in the tunnel, and remove the space and the first pilot tunnel
The temporary support portion 6 of the first pilot tunnel I in I overlapping space, digs the 11st pilot tunnel Ⅺ in an insertion tunnel, and the 11st
The other inner wall sections paving for the part laying pilot tunnel Ⅺ of the first lining cutting the 1, the 11st that the inwall of pilot tunnel Ⅺ is overlapped with tunnel inner wall
If temporary support portion 6, in the inwall of the 11st pilot tunnel Ⅺ formation closed-loop；
S13, the space between the pile body and the 8th pilot tunnel VIII in the tunnel, and remove the space and the second pilot tunnel
The temporary support portion 6 of the second pilot tunnel II in II overlapping space, digs the 12nd pilot tunnel Ⅻ in an insertion tunnel, and the tenth
Lay other inner wall sections of the pilot tunnel Ⅻ of the first lining cutting the 1, the 12nd in the part that the inwall of two pilot tunnels Ⅻ is overlapped with tunnel inner wall
Temporary support portion 6 is laid, in the inwall of the 12nd pilot tunnel Ⅻ formation closed-loop；
S14, all temporary supports 6 of dismounting, the second lining cutting 2 is fixed in covering in the first lining cutting 1, completes final offspur tunnel
The excavation of big arch section section.
Below by one group of embodiment, the present invention will be further described：
As depicted in figs. 1 and 2, city offspur tunnel of the present invention it is big arch section lining cutting type supporting construction include the first lining cutting 1,
Second lining cutting 2, the first longeron 3, the second longeron 4, concrete steel tubing string 5 and temporary support portion 6.Utilize the first of tunnel top
Longeron 3 and the second longeron 4 of bottom connect concrete steel tubing string 5.Concrete steel tubing string 5, the first of tunnel top are indulged
Second longeron of beam 3 and tunnel bottom can provide and effectively realize the vertical supporting in tunnel, and with the first lining cutting 1 and the second lining cutting
2 collectively form carrying system.Supporting construction can be improved using the big arch section lining structure type of city offspur tunnel of the present invention to hold
Power is carried, strengthens the security of supporting construction, so as to reduce flat ratio, reduces excavated section product, improves economy.
As shown in Fig. 2 being the big arch section peripheral rock deformation of effectively control offspur tunnel and top ground settlement, by the tunnel that diverges
The big arch section in road is divided into 12 parts as shown in Figure 2, according to cyclization step by step and the principle closed in time, using the side of step excavation
Method, often completes once to excavate with regard to carrying out closing cyclization, Specific construction step is as follows：
Step one：The first pilot tunnel I is excavated first, narrow-bore tunnel is formed and excavates, and then applies the first lining of preliminary bracing
1 and temporary support portion 6 are built, closing cyclization is carried out；
Step 2：While excavating the first pilot tunnel I, carry out excavating the second pilot tunnel II, then apply the first of preliminary bracing
Lining cutting 1 and temporary support portion 6, carry out closing cyclization；
Step 3：After the completion of the first pilot tunnel I and the second pilot tunnel II excavate cyclization, reinforced concrete pipe column 5 is applied, first
The first longeron 3 of tunnel top and the second longeron 4 of tunnel bottom are applied, then cast-in-situ bored pile is applied at the first pilot tunnel I,
Connect on top with the first longeron of tunnel top, then get through and reach at the second pilot tunnel II to the second longeron 4 of tunnel bottom,
Finally gone along with sb. to guard him on the outside of concrete with steel pipe；
Step 4：The 3rd pilot tunnel III is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 5：The 4th pilot tunnel IV is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 6：The 5th pilot tunnel V is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 7：The 6th pilot tunnel VI is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 8：The 7th pilot tunnel VII is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 9：The 8th pilot tunnel VIII is excavated, the first lining cutting 1 and the temporary support portion 6 of preliminary bracing is applied, is closed into
Ring；
Step 10：The 9th pilot tunnel Ⅸ is excavated, the top right side temporary support portion 6 of the first pilot tunnel I is removed, applies preliminary bracing
First lining cutting 1 and temporary support portion 6, carry out closing cyclization；
Step 11：The tenth pilot tunnel Ⅹ is excavated, the lower section right side temporary support portion 6 of the second pilot tunnel II is removed, applies branch at initial stage
First lining cutting 1 of shield and temporary support portion 6, carry out closing cyclization；
Step 12：The 11st pilot tunnel Ⅺ is excavated, the top left side temporary support portion 6 of the first pilot tunnel I is removed, applies branch at initial stage
First lining cutting 1 of shield and temporary support portion 6, carry out closing cyclization；
Step 13：The 12nd pilot tunnel Ⅻ is excavated, the lower section left side temporary support portion 6 of the second pilot tunnel II is removed, applies initial stage
First lining cutting 1 of supporting and temporary support portion 6, carry out closing cyclization；
Step 14：All temporary supports 6 are removed, the second lining cutting 2 is applied, the big arch section section lining of final offspur tunnel is completed
Build structure.
In summary, technical scheme of the present invention is solved in the big arch section liner structure security of city offspur tunnel not
The problem of foot and difficulty of construction are big, can effectively improve the security of supporting construction, control stratum settlement, and keep long-term steady
It is fixed.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical scheme is extended out still in protection scope of the present invention.
Claims (2)
1. a kind of big arch section method for digging of city offspur tunnel, it is characterised in that include the step of this method
S1, the sectional view based on the tunnel blueprint being pre-designed, an insertion tunnel is dug in the position of the near top in the tunnel
The first pilot tunnel, and lay the first lining cutting in the part that is overlapped with tunnel inner wall of inwall of first pilot tunnel, first pilot tunnel
Other inner wall section laying temporary support portions, in the first pilot tunnel inwall formation closed-loop；
S2, in the tunnel near the tunnel bottom of the first pilot tunnel symmetric position position dig an insertion tunnel second
Pilot tunnel, and lay in the part that is overlapped with tunnel inner wall of inwall of second pilot tunnel the first lining cutting, second pilot tunnel it is other in
Wall part laying temporary support portion, in the second pilot tunnel inwall formation closed-loop；
S3, in the bottom of the first pilot tunnel every a segment distance cast-in-situ bored pile is applied to the second pilot tunnel, passed through at the top of the pile body
First longeron is fixed on the first substrate in the first pilot tunnel, and the bottom of the pile body is fixed in the second pilot tunnel by the second longeron
The first substrate on；
S4, between the left side wall and the pile body in the tunnel distance 1/3rd at space between left side wall it is upper
Half part digs the 3rd pilot tunnel in an insertion tunnel, and lays in the part that is overlapped with tunnel inner wall of inwall of the 3rd pilot tunnel the
One lining cutting, other inner wall sections laying temporary support portion of the 3rd pilot tunnel, in the 3rd pilot tunnel inwall formation closed-loop；
S5, between the left side wall and the pile body in the tunnel distance 1/3rd under space between left side wall
Half part digs the 4th pilot tunnel in an insertion tunnel, and lays in the part that is overlapped with tunnel inner wall of inwall of the 4th pilot tunnel the
One lining cutting, other inner wall sections laying temporary support portion of the 4th pilot tunnel, in the 4th pilot tunnel inwall formation closed-loop；
S6, between the right side wall and the pile body in the tunnel distance 1/3rd at space between right side wall it is upper
Half part digs the 5th pilot tunnel in an insertion tunnel, and lays in the part that is overlapped with tunnel inner wall of inwall of the 5th pilot tunnel the
One lining cutting, other inner wall sections laying temporary support portion of the 5th pilot tunnel, in the 5th pilot tunnel inwall formation closed-loop；
S7, between the right side wall and the pile body in the tunnel distance 1/3rd under space between right side wall
Half part digs the 6th pilot tunnel in an insertion tunnel, and lays in the part that is overlapped with tunnel inner wall of inwall of the 6th pilot tunnel the
One lining cutting, other inner wall sections laying temporary support portion of the 6th pilot tunnel, in the 6th pilot tunnel inwall formation closed-loop；
S8, between the pile body and the 3rd pilot tunnel in the tunnel distance 1/2nd at space between the 3rd pilot tunnel
Dig the 7th pilot tunnel in an insertion tunnel, and served as a contrast in the part laying first that is overlapped with tunnel inner wall of inwall of the 7th pilot tunnel
Build, other inner wall sections laying temporary support portion of the 7th pilot tunnel, in the 7th pilot tunnel inwall formation closed-loop；
S9, between the pile body and the 4th pilot tunnel in the tunnel distance 1/2nd at space between the 4th pilot tunnel
Dig the 8th pilot tunnel in an insertion tunnel, and served as a contrast in the part laying first that is overlapped with tunnel inner wall of inwall of the 8th pilot tunnel
Build, other inner wall sections laying temporary support portion of the 8th pilot tunnel, in the 8th pilot tunnel inwall formation closed-loop；
S10, the space between the pile body and the 5th pilot tunnel in the tunnel, and remove space sky overlapping with the first pilot tunnel
The temporary support portion of the first interior pilot tunnel, digs the 9th pilot tunnel in an insertion tunnel, and in the inwall and tunnel of the 9th pilot tunnel
The first lining cutting is laid in the part that road inwall is overlapped, and other inner wall sections laying temporary support portion of the 9th pilot tunnel is led the 9th
Hole inwall formation closed-loop；
S11, the space between the pile body and the 6th pilot tunnel in the tunnel, and remove space sky overlapping with the second pilot tunnel
The temporary support portion of the second interior pilot tunnel, digs the tenth pilot tunnel in an insertion tunnel, and in the inwall and tunnel of the tenth pilot tunnel
The first lining cutting is laid in the part that road inwall is overlapped, and other inner wall sections laying temporary support portion of the tenth pilot tunnel is led the tenth
Hole inwall formation closed-loop；
S12, the space between the pile body and the 7th pilot tunnel in the tunnel, and remove space sky overlapping with the first pilot tunnel
The temporary support portion of the first interior pilot tunnel, digs the 11st pilot tunnel in an insertion tunnel, and in the inwall of the 11st pilot tunnel
The first lining cutting is laid in the part overlapped with tunnel inner wall, and other inner wall sections of the 11st pilot tunnel lay temporary support portion,
11st pilot tunnel inwall formation closed-loop；
S13, the space between the pile body and the 8th pilot tunnel in the tunnel, and remove space sky overlapping with the second pilot tunnel
The temporary support portion of the second interior pilot tunnel, digs the 12nd pilot tunnel in an insertion tunnel, and in the inwall of the 12nd pilot tunnel
The first lining cutting is laid in the part overlapped with tunnel inner wall, and other inner wall sections of the 12nd pilot tunnel lay temporary support portion,
12nd pilot tunnel inwall formation closed-loop；
S14, all temporary support portions of dismounting, the second lining cutting is fixed in covering in the first lining cutting, and is torn open after the second lining cutting is performed
Except all temporary supports of first layer lining cutting, only retain stanchion as the permanent support in tunnel, complete the final big arch of offspur tunnel
The excavation of section section.
2. method for digging according to claim 1, it is characterised in that the pile body is the coagulation that outer wrap steel pipe is gone along with sb. to guard him
Earth pillar stake.
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 |
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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 |
| 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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| JP2002088789A (en) * | 2000-09-19 | 2002-03-27 | Ishikawajima Constr Materials Co Ltd | Arch tunnel |
| CN102345460A (en) * | 2011-06-21 | 2012-02-08 | 北京交通大学 | Settlement control method for shallow large-section loess tunnel |
| CN102619531A (en) * | 2012-03-06 | 2012-08-01 | 北京交通大学 | Multi-step sequence construction deformation control method for shallow-buried tunnel with big cross section |
| CN103321659B (en) * | 2013-07-22 | 2015-04-22 | 中铁隧道集团有限公司 | Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method |
| CN103510959B (en) * | 2013-09-13 | 2015-12-02 | 北京交通大学 | A kind of Shallow-buried Large-span small interval loess tunnel excavation technology |
| CN104612696B (en) * | 2014-11-28 | 2019-07-05 | 中铁四局集团有限公司 | Overpass column hole method construction method is passed through in big cross section tunneling subway station in fine sand layer |
| CN205154188U (en) * | 2015-11-12 | 2016-04-13 | 北京交通大学 | Supplementary bearing structure that excavates of big hunch of city offspur tunnel section |
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