CN107130613A - Large span tunnel is just wearing the retaining structure and its construction method of existing barricade - Google Patents
Large span tunnel is just wearing the retaining structure and its construction method of existing barricade Download PDFInfo
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- CN107130613A CN107130613A CN201710360989.0A CN201710360989A CN107130613A CN 107130613 A CN107130613 A CN 107130613A CN 201710360989 A CN201710360989 A CN 201710360989A CN 107130613 A CN107130613 A CN 107130613A
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- friction pile
- coupling beam
- retaining structure
- tunnel
- construction
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
Abstract
The invention belongs to Tunnel Engineering technical field, more particularly to a kind of Large span tunnel is just wearing the retaining structure and its construction method of existing barricade, retaining structure includes two row's friction piles, ground coupling beam, coupling beam, Guan Liang, diagonal brace, anchor rope structure and grouting and reinforcing body, two row's friction piles are arranged on the outside of retaining structure, front-seat friction pile is connected apart from retaining structure certain distance and each other with ground coupling beam, heel row friction pile is close to retaining structure and each other with Guan Liang, coupling beam, ground coupling beam connection, connected between two row's friction piles with ground coupling beam and diagonal brace, constitute integral frame structure, set on heel row friction pile to pull-type anchor rope, grouting and reinforcing is carried out to the Rock And Soil of stress side around friction pile by grouting and reinforcing body, improve the bearing capacity of Rock And Soil and retaining structure, the retaining structure is applied to Large span tunnel and imports and exports and require that slope is faced upward at the hole of small deformation, not only consolidation effect had been can guarantee that but also the operation that do not block the traffic.
Description
Technical field
The invention belongs to Tunnel Engineering technical field, more particularly to a kind of Large span tunnel is just wearing the retaining structure of existing barricade
And construction method.
Background technology
Since 21st century, with China Express Railway net, freeway net, high-grade highway net and Municipal
The construction of road network, the traffic engineering infrastructure construction of China is flourished.And many mountain regions in China inland, house, road
Suit measures to local conditions to build by the mountain after using Retaining Wall Reinforcement side slope Deng more, high road network construction then frequently with tunnel structure pass through massif and
The form of side slope italic, this relates to wear house, road under tunnel's entrance and exit section and is just wearing asking for the existing barrier wall structure of side slope
Topic.The general buried depth of Portal Section is shallower, and slope rock mass is comprehensive in crustal movement, weathering Erosion, rain drop erosion and mankind's activity etc.
In length and breadth, constructing tunnel inevitably disturbs slope ground body in effect lower crack, so as to influence top house, traffic route
Stability, meanwhile, the deformation of Rock And Soil can increase the stress of slope protection structure and tunnel lining structure, or even hole again with sliding
Door is likely to result in the failure of existing barrier wall structure after abolishing, and then causes hole to face upward slope unstability, occurs major landslip, not only can shadow
The safety for closing on building and traffic operation is rung, huge economic loss is caused, it is more serious to threaten staff, close on resident and row
The security of the lives and property of people.As can be seen here, under such a operating mode, the scheme of dismounting reconstruction is taken not to facing upward the existing barrier wall structure in slope
Only limit big, cost many, long in time limit, and can not ensure to close on the normal operation of the safety of building and top traffic route, more
It can not ensure that big landslide disaster does not occur for the slope ground body of cranny development.Therefore, slope need to be faced upward to hole using rational scheme
Existing barrier wall structure is reinforced, and to control the deformation and sliding of slope ground body, prevents existing structure from failing, it is to avoid slided at hole
The generation of slope disaster.
At present, the treatment measures for this operating mode are not described in existing tunnel specification and side slope specification, and it is real
Usually carried out in the engineering of border using reinforcement measures such as newly-built supporting constructions outside the slip casting in Slope Treatment, anchor drawing and existing structure
Disease Processing.Slip casting is mainly by improving the strength characteristics of Rock And Soil with Reducing distortion, it is adaptable to cranny development, Rock And Soil pine
Under the conditions of scattered, filling compaction deficiency, structural substrates drag deficiency etc., occurs oxygen blast cyanidation, cracking and slip casting for structure
The stability that gliding mass can not be improved increases the diseases such as sliding force not only no effect aggravates disease, municipal section road on the contrary on the contrary
Face mortar depositing construction had not only disturbed traffic operation but also had influenceed surrounding environment.The pulling force of anchor rope (bar) is limited, for stress it is larger and will
Ask and deform small structure and do not apply to, especially large deformation, which occurs, for tunnel exit and busy road slope retaining structure means knot
The destruction of structure, it is serious to threaten safety.Common newly-built supporting construction has bracket and friction pile, general construction party outside existing structure
Just, short time limit, without interference with the operation of top road, but influences outward appearance, has occupation of land to require again, to ensure that effect is general to each other
Away from smaller, the supporting and retaining system reinforcing that long span tunnel faces upward slope existing structure is not suitable for.
In view of this, it is necessary to invent the retaining structure and its construction method of a kind of existing barricade, the country had both been adapted to
Topographic and geologic condition is reinforced to existing supporting construction, is ensured the supporting effectiveness of structure and is closed on the normal operation of traffic, again
The small spacing defect of existing ruggedized construction can be overcome, it is adaptable to which the slope supporting structure of small deformation is imported and exported and required to Large span tunnel
Reinforcing.Meanwhile, the support to realize this retaining structure provides a kind of construction method, to realize that long span tunnel is existing
The consolidation process of supporting construction.
The content of the invention
In view of this, the present invention can adapt to domestic topographic and geologic condition there is provided one kind to solve the above problems, overcome
Small spacing defect, the retaining structure for the existing Retaining Wall Reinforcement imported and exported suitable for Large span tunnel and construction method, both can guarantee that and add
The operation Gu effect does not block the traffic again.
To reach above-mentioned purpose, the present invention provides following technical scheme：
Including retaining structure, friction pile and grouting and reinforcing body, friction pile include front-seat friction pile and with heel row friction pile, after
The friction pile for arranging friction pile middle part is corresponding with front-seat friction pile, and heel row friction pile is close on retaining structure, and heel row resists
Sliding pile is higher than front-seat friction pile, in same height between the stake top of the adjacent friction pile of front-seat friction pile, with the stake top of front-seat friction pile
Ground coupling beam is installed between the adjacent friction pile of the heel row friction pile of journey, the stake top with front-seat friction pile is on same elevation
Heel row friction pile and front-seat friction pile between be fixedly connected by ground coupling beam, heel row friction pile top is installed with Guan Liang,
Be installed with coupling beam between ground coupling beam in Guan Liang and heel row friction pile, be fixedly mounted between coupling beam and Guan Liang it is some be used for plus
The rib post of strong retaining structure, retaining structure is provided with the pull-type anchor rope for penetrating retaining structure and heel row friction pile, front-seat antiskid
Diagonal brace is fixedly mounted with corresponding heel row friction pile top in the stake top of stake.
Beneficial effect：The present invention builds double friction pile on the outside of existing barricade, and heel row friction pile is close to existing barricade
Build, be divided into in-rock segment and ground epimere, front-seat friction pile before existing barricade at a certain distance from build, predominantly embedded rock pile；Before
Row's friction pile is linked together in its stake top by ground coupling beam, and is connected using diagonal brace and ground coupling beam with heel row friction pile；Heel row
The ground epimere of friction pile connects to form an entirety by Guan Liang, coupling beam and ground coupling beam, and the thrust that retaining structure is transmitted is shared
Onto each friction pile, big spacing between stake is realized；Thrust is delivered to front-seat anti-by heel row friction pile by diagonal brace and ground coupling beam
In sliding pile, to reduce the deformation of heel row friction pile, the consolidation effect and bearing capacity of enhancing structure；Guan Liang on heel row friction pile
Vertical rib post is set between coupling beam below, strengthens the ability of friction pile cantilever segment and Guan Liang resistance to deformation；Heel row antiskid
Stake both sides can also add friction pile, for sharing the power in intermediate structure, to increase the bearing capacity of structure.
It can also set and be connected between some row's friction piles, adjacent each row's friction pile by ground before the front-seat friction pile of the present invention
Beam is fixedly connected, and is fixedly connected between the friction pile before front-seat friction pile and corresponding heel row friction pile by diagonal brace, multiple rows of antiskid
Stake and the cooperation of diagonal brace can be played a part of further reinforcing to retaining structure.
Further, the one end of diagonal brace away from front-seat friction pile stake top is connected to heel row friction pile and intersected with coupling beam or Guan Liang
Position, wedge shape is formed between coupling beam and corresponding heel row friction pile between diagonal brace, front-seat friction pile and heel row friction pile
Frame structure.Beneficial effect：The one end of diagonal brace away from front-seat friction pile stake top is connected to heel row friction pile and coupling beam or Guan Liang
Intersecting position, enable to diagonal brace to the consolidation effect of retaining structure more preferably.
Further, pull-type anchor rope penetrates existing barricade and retaining structure, and anchor rope one end is fixedly mounted by anchor pull head
In heel row friction pile, the other end is fixed in basement rock supporting body by slip casting.
Further, grouting and reinforcing body is arranged on around friction pile, and slip casting is carried out to the Rock And Soil of stress side around friction pile
Reinforce.Beneficial effect：The present invention can be carried out using necessary slip casting measure to the Rock And Soil of loose, cranny development before friction pile
Reinforce, to improve the bearing capacity of Rock And Soil and friction pile.The present invention uses advance support or pipe canopy pair before tunnel excavation
Arch Rock And Soil is reinforced, to reduce the sedimentation and surface subsidence of tunnel vault, it is ensured that the stabilization of existing building and traffic
Normal operation.
The construction method that Large span tunnel is just wearing the retaining structure of existing barricade in the present invention is real by the following technical programs
Existing：
The Large span tunnel is just wearing the construction method of the retaining structure of existing barricade, comprises the following steps：
Step one：Preparation of construction, comprises the following steps：
1st, construction survey is carried out in Sui Zhi areas by construction design drawing, survey sets out tunnel portal and its in the existing barricade of side slope
On excavation contour line, including the center line in the main hole in tunnel and peripheral sideline at hole；
2nd, the tunnel portal contour line set out according to construction design drawing and survey, measures the friction pile position nearby to be built
Profile, and mark the sequence of construction of friction pile；
3rd, the tunnel portal and friction pile position profile set out according to construction design drawing, survey, survey sets out the anchor to be applied
Drag-line position.
Step 2：The reinforcing retaining structure construction of the existing barricade of long span tunnel, comprises the following steps：
1st, to reduce influence of the antiskid pile driving construction to the existing barricade of tunnel portal and shortening the construction period, the underground of friction pile
In-rock segment uses quincunx sequence of construction, interval construction；
2nd, the position contour line of the friction pile set according to surveying, while between the friction pile for heel row center position of constructing and both sides
Every friction pile and front-seat Center stake both sides friction pile, at the bottom surface elevation for being all poured into ground coupling beam；
3rd, the position contour line of the remaining stake set according to surveying, the bottom surface for remaining friction pile to ground coupling beam of and then constructing is high
At journey；
4th, constructed after the in-rock segment of friction pile, one-piece casting ground coupling beam structure, and in the cushion cap on front-seat friction pile top
The reinforcing bar of the default diagonal brace in place；
5th, according to the anchor rope position and anchor rope and horizontal plane surveyed between the heel row friction pile coupling beam set out and ground coupling beam
Design angle, the pull-type anchor rope of constructing, one end of anchor rope is fixed in basement rock supporting body using slip casting, and the other end passes through anchor
Pull head is fixed in heel row friction pile；
6th, after the anchor rope constructed on this section of friction pile, the friction pile below one-piece casting coupling beam and coupling beam, and even
The junction of beam and friction pile, which is preset, presets rib post reinforcing bar in the reinforcing bar of diagonal brace, coupling beam；
7th, the anchor rope constructed according to the method for above-mentioned construction procedure 5 between Guan Liang and coupling beam；
8th, complete after anchor rope construction, reinforcement placing and template, friction pile, rib post and the hat on one-piece casting coupling beam top
Beam；
9th, according to design drawing and the default reinforcing bar of diagonal brace, the reinforcing bar and template of diagonal brace is set up, diagonal brace is poured, completed whole
The construction of individual retaining structure；
10th, can around grouting and reinforcing friction pile power transmission carrying Rock And Soil, with the bearing capacity of enhancing structure.
Step 3：Large span tunnel is constructed, and is comprised the following steps：
1st, the existing barricade in hole retaining structure construct complete, into after the maintenance stage, you can carry out tunnel excavation and
Liner structure is applied；
2nd, the portal profile set according to survey, is punched using rig on the existing barricade above arch, is led using small in advance
Rock And Soil after pipe or pipe booth structure reinforcement walls, to reduce Vault settlement, it is to avoid cause Earth cave, influence top is built
Safety and traffic operation, then carry out that portal is abolished, tunnel excavation and lining cutting are applied；
3rd, the constructing tunnel after existing barricade still carries out advance support first with pipe canopy or advanced tubule, then excavates
Tunnel, applies liner structure in time；
4th, constructing tunnel is using small drilling depth, diligent measurement, the method for fast supporting, to ensure construction safety.
Advantage for present invention：
1st, reinforced on the outside of existing barricade, rigid structure meets deformation requirements
Technical scheme proposed by the present invention by retaining structure, friction pile, Guan Liang, coupling beam, coupling beam, diagonal brace, pull-type anchor draw
Rope and basement rock supporting body composition, are applied on the outside of existing barrier wall structure.On the basis of existing structure plays a role, antiskid is utilized
Stake, diagonal brace, anchor rope formation rigid structure and Guan Liang, coupling beam, coupling beam formation force transfer system collective effect, thrust is passed
It is delivered on the basement rock supporting body of lower section, is greatly reduced the deformation of structure and the movement of gliding mass, the small deformation in engineering can be met
It is required that.
2nd, the engine request of big spacing between friction pile is realized
Friction pile in the present invention is connected by girder construction, realizes sharing for power, reduces the stress in single stake, one
Engineering demand can also be met by determining increasing friction pile spacing in scope, and the operating mode for the excavation long span tunnel between friction pile is outstanding
It is applicable.
3rd, symmetrical configuration, outward appearance is beautiful
Sliding-resistant system in the present invention is using friction pile, beam and diagonal brace to form similar on the outside of existing barrier wall structure
Frame structure, symmetrical on neutral surface, outward appearance harmony is beautiful.
4th, material is saved compared to bracket structure, practicality is stronger
The present invention instead of bracket using ground coupling beam and inclined support structure, and simple structure saves material.Meanwhile, utilize front row
Structure thrust is delivered on preferable basement rock supporting body by friction pile, even if top layer Rock And Soil is relatively crushed, also can be using the present invention
Supporting and retaining system reinforcing is carried out, the applicability of the present invention is greatly enhanced.
5th, apply arrangement compact, the duration can be shortened to greatest extent, reduce Coherent traffic noise
Sliding-resistant system proposed by the present invention is applied on the outside of existing barrier wall structure, easy construction, can many friction piles it is same
When construct, and the construction method adaptable with it proposed arranges compact, and the construction period is shortened to greatest extent, can be reduced
Construction infection, most fast can reach consolidation effect again, meanwhile, the traffic operation above existing barricade will not be hindered.
Other advantages and features of the present invention determine according to practical application engineering to a certain extent, can be from reality hereafter
Apply and certain elaboration is carried out in example, to some teachings of various equivalent modifications.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 is the stereogram for the retaining structure that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 2 is the front view for the retaining structure that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 3 is the structural representation for the retaining structure B-B sections that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 4 is the structural representation for the retaining structure C-C sections that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 5 is the structural representation for the retaining structure D-D sections that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 6 is the construction process figure for the retaining structure construction method that Large span tunnel of the present invention is just wearing existing barricade.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Reference in Figure of description includes：
Basement rock supporting body 1, potential slide surface 2, gliding mass 3, Po Ding road surfaces 4, above-ground route 5, retaining structure 6, friction pile 7, note
Starch reinforcing body 8, coupling beam 9, stake end cushion cap 10, coupling beam 11, rib post 12, anchor rope 13, anchor pull head 14, Guan Liang 15, diagonal brace 16, even
Encircle tunnel partition wall 17, advanced tubule 18, tunnel lining structure 19, tunnel portal 20.
As shown in Figure 1, Figure 2, the Large span tunnel shown in Fig. 3, Fig. 4 and Fig. 5 is just wearing the retaining structure of existing barricade, and the present embodiment is
The town road of heavy traffic is worn under certain multiple-arch tunnel outlet section, tunnel, hole mileage ZK5+494.461 and YK5+495 are worn
The more existing barricade of road slope.In the artificial plain fill of Portal Section overlying and silty clay, 3.90~15.20m of thickness, the Jurassic system that underlies
System sandy soil stabilizer mud stone, sandstone, ground interface are steeper.Rock layer surface has the thick highly weathered rock mass of 0.9~2.7m, relatively crushes,
The harm such as it may cause chip off-falling after tunnel excavation, collapse.The high about 18.8m in slope is faced upward at hole, mainly by plain fill and highly weathered rock mass
Composition.Tunnel list hole is three lanes large-span structure, excavates and abolishes after portal barricade, and existing barrier wall structure may be ineffective,
Causing to face upward the slope soil body may destroy along rock soil interface or the interior slip that bankets, and threaten workmen, road above equipment and side slope
Road, the safety of structures.On the basis of engineering demand, through checking computations, it was demonstrated that can using sliding-resistant system provided by the present invention and
Construction method is faced upward progress scheme outside the existing barricade in slope in this long span tunnel 20 and applied.
The operating mode for facing upward the existing barricade in slope is just being worn to the Large span tunnel using the sliding-resistant system of the present invention, specific technical scheme
It is as follows：
Embodiment uses 8 sizes for 2000 × 3000 friction pile 7, heel row friction pile according to the sliding-resistant system of the present invention
7 be 5, and front-seat friction pile 7 is 3 corresponding with the centre 3 of heel row friction pile 7.
5 friction piles 7 of heel row friction pile 7 are connected with the Guan Liang 15, coupling beam 11 and ground coupling beam 9 that size is 1500 × 3000
Connect, ground epimere is all 18m, middle friction pile 7 build-in 19.25m, the equal build-in 14.25m of 4 piles of the middle both sides of friction pile 7.
The front-seat equal build-in 15.75m of 3 friction piles 7, the ground coupling beam 9 using size as 1500 × 3000 is in its antiskid each other
The top of stake 7 links together.
Front two rows friction pile 7 is 2000 × 2000 and and heel row by 2000 × 1500 ground coupling beam 9 and size of size
The angle of friction pile 7 is that 45 ° of diagonal brace 16 is connected, and constitutes integral frame structure.
The anchor rope 13 set on heel row friction pile 7, the middle top of friction pile 7 sets one, with the horizontal 30 ° of folders
Angle；Two are set respectively on close to the both sides friction pile 7 of central pile, with the horizontal 20 ° of angles；On the friction pile 7 in two outsides
4 are set respectively, with the horizontal 20 ° of angles.
Grouting and reinforcing is carried out to the Rock And Soil of the front-seat front side of friction pile 7, to strengthen the carrying energy of Rock And Soil and retaining structure
Power, and then Reducing distortion.
Large span tunnel as shown in Figure 6 is just wearing the construction method of the retaining structure of existing barricade, comprises the following steps：
Step one：Preparation of construction
1st, construction survey is carried out in Sui Zhi areas by construction design drawing, survey sets out tunnel portal 20 and its in the existing gear of side slope
Excavation contour line on wall, including the center line in the main hole in two tunnels and peripheral sideline at hole or so；
2nd, the friction pile 7 to be built is being measured at the hole measured near tunnel contour line according to construction design drawing
Put, and mark its sequence of construction；
3rd, according to construction design drawing and the position profile for the heel row friction pile 7 measured, survey sets out anchor rope 13 to be applied
Position.
Step 2：The ruggedized construction construction of the existing barricade in hole
1st, position is set according to the survey of friction pile 7, while four friction piles 7 and the heel row center of front and rear row both sides of constructing
A friction pile 7 to ground coupling beam 9 bottom surface elevation at；
2nd, and then a friction pile 7 and remaining two friction piles 7 of heel row for the front-seat center position of construction connects to ground
At the bottom surface elevation of beam 9；
3rd, the reinforcing bar of ground coupling beam 9 is set up, the reinforcing bar of diagonal brace 16 is preset at stake end cushion cap 10, the support ground template of coupling beam 9 is overall
The stake end cushion cap 10 at the ground component of coupling beam 9 and front-seat 7 ends of friction pile is poured, makes one overall structure of formation of front and rear row friction pile 7；
4th, the position of the anchor rope 13 set according to surveying, the anchor rope 13 between construction ground coupling beam 9 and coupling beam 11, ground lower end leads to
Cross slip casting to be fixed in basement rock supporting body 1, the end anchor pull head 14 of friction pile 7 is fixed；
5th, reinforcement placing, the steel of diagonal brace 16 is preset in the junction of the corresponding heel row friction pile 7 of front-seat friction pile 7 and coupling beam 11
Muscle, support shuttering, one-piece casting coupling beam 11 and friction pile 7 below；
6th, continue the anchor rope 13 constructed between Guan Liang 15 and coupling beam 11, ground lower end by slip casting and basement rock supporting body 1 or
Middle Wall of Multi-Arch Highway Tunnel 17 is fixed, and the end anchor pull head 14 of friction pile 7 is fixed；
7th, reinforcement placing, the template of construction friction pile 7, rib post 12 and Guan Liang 15, one-piece casting concrete forms overall knot
Structure；
8th, the template of construction diagonal brace 16, lays reinforcing bar, and casting concrete completes the construction of whole retaining structure；
9th, after front-seat friction pile 7 reaches intensity requirement, you can carry out grouting and reinforcing to the Rock And Soil in front of it.
Step 3：Tunnel portal is constructed
1st, multiple-arch tunnel uses central drift method inside rock mass to excavation at the barricade of hole in the present embodiment；
2nd, middle drift is first excavated during constructing tunnel, advanced 5~10m of tunnel tunnel face applies interim liner structure and tunnel
Mid-board；
3rd, advanced tubule 18 or pipe booth structure are applied before tunnel excavation in vault Rock And Soil, to the power of vault Rock And Soil
Learning performance is improved, and strengthens its intensity, Reducing distortion；
4th, after tunnel is excavated using benching tunneling method, tunnel lining structure 19 is applied in time, forms the loop configuration of closing,
To reduce, the Rock And Soil on top is settled and gliding mass 3 is moved；
5th, tunnel structure, which is all applied, faces upward slope supporting and retaining system and is linked to be with existing supporting and retaining system after entirety, first abolishes pilot tunnel portal and timely
Crack is blocked, then tunnel portal barricade is abolished again and applies tunnel structure in time, crack is blocked, the portal for completing tunnel is applied
Work；
6th, after tunnel structure evagination certain distance, tunnel portal 20 is applied, the construction that barricade is just being worn in tunnel is completed.
Example proves that the retaining structure construction method that Large span tunnel of the invention is just wearing existing barricade is applied to Large span tunnel
Just wearing the operating mode for facing upward the existing barricade in slope in hole 20.Large span tunnel in the present invention is just wearing the retaining structure design letter of existing barricade
Single, consumptive material is less, and outward appearance is beautiful, easy construction, and construction method arranges compact, can effectively shorten the duration, realize Large span tunnel
The supporting and retaining system that the existing barricade on slope is faced upward at hole 20 is reinforced, control slope sliding and deformation, reduces construction disturbance and to closing on traffic fortune
The influence of battalion, reduces construction risk, saves construction costs.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. Large span tunnel is just wearing the retaining structure of existing barricade, it is characterised in that including retaining structure (6), friction pile (7) and note
Starch reinforcing body (8), the friction pile include front-seat friction pile and with heel row friction pile, the friction pile of heel row friction pile middle part
Corresponding with front-seat friction pile, heel row friction pile is close on retaining structure, and heel row friction pile is higher than front-seat friction pile, and front row is anti-
Adjacent friction pile of the stake top of between the stake top of the adjacent friction pile of sliding pile and front row friction pile in the heel row friction pile of same elevation
Between be installed with ground coupling beam (9), with the heel row friction pile of the stake top of front-seat friction pile on same elevation and front-seat antiskid
It is fixedly connected between stake by ground coupling beam, the heel row friction pile top is installed with Guan Liang (15), Guan Liang and heel row antiskid
Coupling beam (11) is installed between ground coupling beam in stake, be fixedly mounted between the coupling beam and Guan Liang it is some be used for strengthen supporting and retaining system
The rib post (12) of structure, the retaining structure is provided with the pull-type anchor rope (13) for penetrating retaining structure and heel row friction pile, preceding
Diagonal brace (16) is fixedly mounted with corresponding heel row friction pile top in the stake top for arranging friction pile.
2. Large span tunnel as claimed in claim 1 is just wearing the retaining structure of existing barricade, it is characterised in that diagonal brace is away from front-seat
One end of friction pile stake top is connected to the position that heel row friction pile intersects with coupling beam or Guan Liang, diagonal brace, front-seat friction pile and after
Wedge-shaped frame structure is formed between coupling beam and corresponding heel row friction pile between row's friction pile.
3. Large span tunnel as claimed in claim 2 is just wearing the retaining structure of existing barricade, it is characterised in that the pull-type anchor is drawn
Rope penetrates existing barricade and retaining structure, and described anchor rope one end is fixedly mounted in heel row friction pile by anchor pull head (14),
The other end is fixed in basement rock supporting body (1) by slip casting.
4. Large span tunnel as claimed in claim 3 is just wearing the retaining structure of existing barricade, it is characterised in that the grouting and reinforcing
Body (8) is arranged on around friction pile, and grouting and reinforcing is carried out to the Rock And Soil of stress side around friction pile.
5. a kind of Large span tunnel is just wearing the construction method of the retaining structure of existing barricade, it is characterised in that work progress include with
Lower step：
Step one：Preparation of construction, comprises the following steps：
1) according to design drawing, survey sets out center line and outer contour of the tunnel portal on existing barricade；
2) combine design drawing and survey outer contour of the tunnel portal set out on existing barricade, determine the position of friction pile
And its contour line, and mark sequence of construction；
3) tunnel portal and friction pile position contour line set out with reference to design drawing and survey, survey sets out setting for pull-type anchor rope
Seated position, and mark；
Step 2：The reinforcing retaining structure construction of the existing barricade of long span tunnel, comprises the following steps：
1) the friction pile position profile that sets is surveyed according to step one, according to quincuncial sequence of construction interval construction friction pile to company
Soffit elevation；
2) integral erection reinforcing bar and template, one-piece casting ground coupling beam and the cushion cap on front-seat friction pile top, and preset at cushion cap
The reinforcing bar of diagonal brace；
3) the anchor rope position for setting out and marking is surveyed according to step one, the anchor rope between construction coupling beam and ground coupling beam is integrally poured
Build coupling beam and friction pile below；
4) the anchor rope position for setting out and marking, the anchor rope between construction Guan Liang and coupling beam, one-piece casting are surveyed according to step one
Guan Liang and friction pile, rib post below；
5) inclined support structure is applied, the construction of whole retaining structure is completed；
6) grouting and reinforcing is carried out to the Rock And Soil before friction pile, to improve the bearing capacity of Rock And Soil and retaining structure；
Step 3：Large span tunnel is constructed, and is comprised the following steps：
1) the retaining structure construction of existing barricade described in step 2 completes to enter after the maintenance stage, you can carry out constructing tunnel；
2) according to the portal profile that sets of survey, punched using rig on the existing barricade above arch, using advanced tubule or
Rock And Soil after pipe booth structure reinforcement walls, then carry out that portal is abolished, tunnel excavation and lining cutting are applied；
3) advance support is carried out to tunnel vault Rock And Soil using advanced tubule or pipe booth structure before tunnel excavation；
4) constructing tunnel is using small drilling depth, diligent measurement, the method for fast supporting, to ensure construction safety.
6. Large span tunnel as claimed in claim 5 is just wearing the construction method of the retaining structure of existing barricade, it is characterised in that step
In rapid two 1) described in friction pile quincunx sequence of construction, refer to the position contour line of friction pile set according to surveying, first construct
The friction pile of heel row center position and the friction pile at both sides interval and front-seat friction pile not corresponding therewith, are all poured into ground
At the bottom surface elevation of coupling beam, and then construct remaining friction pile to ground coupling beam bottom surface elevation at.
7. Large span tunnel as claimed in claim 6 is just wearing the construction method of the retaining structure of existing barricade, it is characterised in that step
In rapid two 3) described in one-piece casting coupling beam, refer to preset the reinforcing bar of diagonal brace in coupling beam and heel row friction pile junction, in coupling beam
Preset the reinforcing bar of rib post in upside.
8. Large span tunnel as claimed in claim 7 is just wearing the construction method of the retaining structure of existing barricade, it is characterised in that step
In rapid two 3) and 4) described in anchor rope construction, refer to that, by drilling, anchor rope passes through existing barrier wall structure, and one end passes through slip casting
It is fixed in basement rock supporting body, the other end is fixed in anti-slide pile structure using anchor pull head.
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| CN108194095A (en) * | 2018-03-20 | 2018-06-22 | 上海市城市建设设计研究总院（集团）有限公司 | The prefabricated superposed type vehicle driving passage structure of subterranean tunnel or gallery |
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| CN110205889B (en) * | 2019-06-11 | 2021-03-02 | 兰州铁道设计院有限公司 | Method for carrying out existing line roadbed slope width transformation by adopting combined pile slab wall structure |
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| CN111305237A (en) * | 2020-03-05 | 2020-06-19 | 中煤科工集团重庆设计研究院有限公司 | Slope supporting structure and construction method |
| CN112502188B (en) * | 2020-12-10 | 2022-03-22 | 河南博源电力设备股份有限公司 | Power communication comprehensive pipe rack in easy-to-slide area and construction method thereof |
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| CN114922200A (en) * | 2022-01-17 | 2022-08-19 | 兰州交通大学 | Existing-new combined retaining structure for wide embankment and construction method |
| CN114922200B (en) * | 2022-01-17 | 2023-11-24 | 兰州交通大学 | Existing-newly-built combined retaining structure of wide road embankment and construction method |
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