CN107130613B - 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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- CN107130613B CN107130613B CN201710360989.0A CN201710360989A CN107130613B CN 107130613 B CN107130613 B CN 107130613B CN 201710360989 A CN201710360989 A CN 201710360989A CN 107130613 B CN107130613 B CN 107130613B
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- friction pile
- coupling beam
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- retaining structure
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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 fields, in particular to a kind of Large span tunnel is just wearing the retaining structure and its construction method of existing barricade, retaining structure includes two rows of friction piles, ground coupling beam, coupling beam, crown beam, diagonal brace, anchor rope structure and grouting and reinforcing body, two rows of friction piles are mounted on the outside of retaining structure, front-seat friction pile is apart from retaining structure certain distance and each other with the connection of ground coupling beam, heel row friction pile is close to retaining structure and each other with crown beam, coupling beam, the connection of ground coupling beam, it is connected with ground coupling beam with diagonal brace between two rows of friction piles, constitute integral frame structure, it is arranged on heel row friction pile to pull-type anchor rope, grouting and reinforcing is carried out by Rock And Soil of the grouting and reinforcing body to stress side around friction pile, improve the bearing capacity of Rock And Soil and retaining structure, the retaining structure is suitable for Large span tunnel and imports and exports and the hole of small deformation is required to face upward slope , not only can guarantee consolidation effect but also the operation that do not block the traffic.
Description
Technical field
The invention belongs to Tunnel Engineering technical field, in particular to a kind of Large span tunnel is just wearing the retaining structure of existing barricade
And its construction method.
Background technique
Since 21st century, with China express railway net, freeway net, high-grade highway net and Municipal
The traffic engineering infrastructure construction of the construction of road network, China is flourished.And China, more mountainous regions, inland, house, road
Etc. more adaptation to local conditions using building by the mountain after Retaining Wall Reinforcement side slope, 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 to tunnel's entrance and exit section and just wears 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.
Act on lower crack in length and breadth, constructing tunnel inevitably disturbs slope ground body, to influence top house, traffic route
Stability, meanwhile, the deformation of Rock And Soil can increase stress or even the hole of slope protection structure and tunnel lining structure with sliding again
Door may cause the failure of existing barrier wall structure after abolishing, and then hole is caused to face upward slope unstability, and major landslip occurs, not only can shadow
The safety for closing on building and traffic operation is rung, huge economic loss is caused, more seriously threatens staff, closes on resident and row
The security of the lives and property of people.It can be seen that taking the scheme of dismounting reconstruction not to the existing barrier wall structure in slope is faced upward under such operating condition
Only limitation is big, cost is more, long in time limit, and not can guarantee the normal operation of the safety for closing on building and top traffic route, more
Big landslide disaster does not occur for the slope ground body that not can guarantee cranny development.Therefore, slope need to be faced upward to hole using reasonable scheme
Existing barrier wall structure is reinforced, and to control the deformation and sliding of slope ground body, prevents existing structure from failing, and avoids hole sliding
The generation of slope disaster.
Currently, the treatment measures for this operating condition are not described in existing tunnel specification and side slope specification, and it is real
It is usually drawn using the slip casting in Slope Treatment, anchor in the engineering of border and existing structure creates the reinforcement measures such as supporting construction outside and carries out
Disease Processing.Slip casting is mainly to pass through the strength characteristics for improving Rock And Soil with Reducing distortion, is suitable for cranny development, Rock And Soil pine
Under the conditions of scattered, filling compaction deficiency, structural substrates drag deficiency etc., oxygen blast cyanidation, cracking and slip casting have been occurred for structure
The stability that gliding mass cannot be improved increases the diseases such as sliding force instead and not only aggravates disease, municipal section road instead without effect
Face mortar depositing construction had not only interfered traffic operation but also had influenced ambient enviroment.The pulling force of anchor rope (bar) is limited, larger for stress and want
It asks and deforms small structure and be not suitable for, especially large deformation, which occurs, for tunnel exit and busy road slope retaining structure means to tie
The destruction of structure, seriously threatens safety.Common newly-built supporting construction has bracket and friction pile, general construction party outside existing structure
Just, short time limit will not interfere the operation of top road, but influence appearance, and have land occupation to require, to guarantee effect generally to each other
Away from smaller, it is not suitable for long span tunnel and faces upward the supporting and retaining system of slope existing structure reinforcing.
In view of this, it is necessary to which the retaining structure and its construction method for inventing a kind of existing barricade had both adapted to the country
Topographic and geologic condition reinforces existing supporting construction, ensures the supporting effectiveness of structure and closes on the normal operation of traffic, again
The small spacing defect that existing ruggedized construction can be overcome imports and exports and requires the slope supporting structure of small deformation suitable for Large span tunnel
Reinforcing.Meanwhile to realize that the support of this retaining structure provides a kind of construction method, to realize that long span tunnel is existing
The consolidation process of supporting construction.
Summary of the invention
It can adapt to domestic topographic and geologic condition in view of this, the present invention, provides one kind to solve the above-mentioned problems, overcome
The retaining structure and construction method of small spacing defect, the existing Retaining Wall Reinforcement imported and exported suitable for Large span tunnel both can guarantee and add
The operation Gu effect does not block the traffic again.
In order to achieve the above objectives, the invention provides the 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 centre position is corresponding with front-seat friction pile, and heel row friction pile is tightly attached on retaining structure, and heel row is anti-
Sliding pile is higher than front-seat friction pile, and the stake top between the stake top of the adjacent friction pile of front-seat friction pile, with front-seat friction pile is in same height
Ground coupling beam is fixedly 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 by coupling beam be fixedly connected, heel row friction pile top is fixedly installed with crown beam,
Be fixedly installed with coupling beam between ground coupling beam in crown beam and heel row friction pile, be fixedly mounted between coupling beam and crown beam it is several be used to plus
The rib column of strong retaining structure, retaining structure are equipped 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.
The utility model has the advantages that the present invention builds double friction pile on the outside of existing barricade, heel row friction pile is close to existing barricade
It builds, is divided into in-rock segment and ground upper section, is built at a certain distance from front-seat friction pile is before existing barricade, predominantly embedded rock pile；Before
Row's friction pile is linked together in its stake top by ground coupling beam, and is connect using diagonal brace and ground coupling beam with heel row friction pile；Heel row
The ground upper section of friction pile is connected to form a whole by crown beam, 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 transmitted 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；Crown beam on heel row friction pile
Vertical rib column is set between coupling beam below, reinforces the ability of friction pile cantilever segment and crown beam resistance to deformation；Heel row antiskid
Stake two sides can also add friction pile, for sharing the power in intermediate structure, to increase the bearing capacity of structure.
Several row's friction piles can also be set before front-seat friction pile of the invention, connected between adjacent each row's friction pile by ground
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 play the role of retaining structure further to reinforce.
Further, diagonal brace is connected to heel row friction pile far from one end of front-seat antiskid stake top and intersects with coupling beam or crown beam
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.The utility model has the advantages that diagonal brace is connected to heel row friction pile and coupling beam or crown beam far from one end of front-seat antiskid stake top
The position of intersection, 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 mounted on around friction pile, carries out slip casting to the Rock And Soil of stress side around friction pile
It reinforces.Rock And Soil loose, cranny development before friction pile is carried out the utility model has the advantages that necessary slip casting measure can be used in the present invention
It reinforces, 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, and to reduce the sedimentation and surface subsidence of tunnel vault, guarantees the stabilization and traffic of existing building
Normal operation.
It is real by the following technical programs that Large span tunnel, which is just wearing the construction method of the retaining structure of existing barricade, in the present invention
Existing:
The Large span tunnel is just wearing the construction method of the retaining structure of existing barricade, comprising the following steps:
Step 1: preparation of construction, comprising the following steps:
1, construction survey is carried out in the area Sui Zhi by construction design drawing, survey sets out tunnel portal and its in the existing barricade of side slope
On excavation contour line, center line including the main hole in tunnel at hole and peripheral sideline；
2, 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；
3, the tunnel portal and friction pile position profile set out according to construction design drawing, survey, survey set out the anchor to be applied
Drag-line position.
Step 2: the reinforcing retaining structure construction of the existing barricade of long span tunnel, comprising the following steps:
1, 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；
2, according to the position contour line for surveying the friction pile set, while between the friction pile and two sides for heel row center position of constructing
Every friction pile and front-seat Center stake two sides friction pile, be all poured at the bottom surface elevation of ground coupling beam；
3, according to the position contour line for surveying the remaining stake set, the bottom surface of and then construct remaining friction pile to ground coupling beam is high
At journey；
4, it has constructed after the in-rock segment of friction pile, one-piece casting ground coupling beam structure, and the cushion cap on front-seat friction pile top
Locate the reinforcing bar of default diagonal brace；
5, according to the anchor rope position and anchor rope surveyed between the heel row friction pile coupling beam set out and ground coupling beam and horizontal plane
Design angle, one end of pull-type anchor rope of constructing, 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；
6, after the anchor rope constructed on this section of friction pile, friction pile below one-piece casting coupling beam and coupling beam, and even
The reinforcing bar of diagonal brace is preset in the junction of beam and friction pile, presets rib column reinforcing bar in coupling beam；
7, the anchor rope constructed between crown beam and coupling beam according to the method for above-mentioned construction procedure 5；
8, after completing anchor rope construction, reinforcement placing and template, friction pile, rib column and the hat on one-piece casting coupling beam top
Beam；
9, according to the default reinforcing bar of design drawing and diagonal brace, the reinforcing bar and template of diagonal brace are set up, pours diagonal brace, is completed whole
The construction of a retaining structure；
10, 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 construction, comprising the following steps:
1, the existing barricade in hole retaining structure construct complete, into after the maintenance stage, can carry out tunnel excavation and
Liner structure applies；
2, the portal profile set according to survey, is punched on the existing barricade above arch using drilling machine, is led using small in advance
Rock And Soil avoids causing Earth cave after pipe or pipe booth structure reinforcement walls to reduce Vault settlement, influences top building
Safety and traffic operation, then carry out that portal is abolished, tunnel excavation and lining cutting apply；
3, 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；
4, constructing tunnel is using small drilling depth, the method for diligent measurement, fast supporting, to guarantee construction safety.
Advantage for present invention:
1, it is reinforced on the outside of existing barricade, rigid structure meets deformation requirements
Technical solution proposed by the present invention by retaining structure, friction pile, crown beam, coupling beam, coupling beam, diagonal brace, pull-type anchor draw
Rope and basement rock supporting body composition, apply 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 formed rigid structure and crown beam, coupling beam, coupling beam formed 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.
2, 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, and one
Engineering demand can also be met by determining increasing friction pile spacing in range, outstanding for the operating condition for excavating long span tunnel between friction pile
It is applicable.
3, symmetrical configuration, appearance are beautiful
Sliding-resistant system in the present invention be formed on the outside of existing barrier wall structure using friction pile, beam and diagonal brace it is similar
Frame structure, symmetrical about neutral surface, appearance harmony is beautiful.
4, material is saved compared to bracket structure, practicability is stronger
For the present invention using ground coupling beam and inclined support structure instead of bracket, simple structure saves material.Meanwhile utilizing front row
Structure thrust is transmitted on preferable basement rock supporting body by friction pile, also can be using the present invention even if surface layer Rock And Soil is relatively broken
Supporting and retaining system reinforcing is carried out, applicability of the invention is greatly enhanced.
5, it is compact to apply arrangement, can shorten the construction period to greatest extent, reduces Coherent traffic noise
Sliding-resistant system proposed by the present invention is applied on the outside of existing barrier wall structure, easy for construction, can more friction piles it is same
When the construction method adaptable with it constructing, and propose arrange compact, shorten the construction period to greatest extent, can reduce
Construction infection, but can be most fast reach consolidation effect, 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
It applies and carries out certain elaboration in example, to some introductions of those skilled in the relevant arts.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is the perspective view for the retaining structure that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 2 is the main view for the retaining structure that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 3 is the structural schematic diagram for the retaining structure B-B section that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 4 is the structural schematic diagram for the retaining structure C-C section that Large span tunnel of the present invention is just wearing existing barricade；
Fig. 5 is the structural schematic diagram for the retaining structure D-D section 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.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
Appended drawing reference in Figure of description includes:
Basement rock supporting body 1, potential slide surface 2, gliding mass 3, top of the slope road surface 4, ground line 5, retaining structure 6, friction pile 7, note
Starch reinforcing body 8, coupling beam 9, stake end cushion cap 10, coupling beam 11, rib column 12, anchor rope 13, anchor pull head 14, crown beam 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, Fig. 3, Fig. 4 and Large span tunnel shown in fig. 5 are just wearing the retaining structure of existing barricade, and the present embodiment is
Certain multiple-arch tunnel outlet section wears the town road of heavy traffic under tunnel, and hole mileage ZK5+494.461 and YK5+495 are worn
The more existing barricade of road slope.Cover artificial plain fill and silty clay on Portal Section, 3.90~15.20m of thickness, in the Jurassic system that underlies
System sandy soil stabilizer mud stone, sandstone, ground interface are steeper.Rock layer surface has the highly weathered rock mass of 0.9~2.7m thickness, relatively broken,
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, and after excavating and abolishing portal barricade, existing barrier wall structure may lost effect,
Leading to face upward the slope soil body may destroy along rock soil interface or the interior slip that bankets, and threaten construction personnel, road above equipment and side slope
Road, structures safety.On the basis of engineering demand, through checking, it was demonstrated that can be used 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 and is applied.
The operating condition for facing upward the existing barricade in slope is just being worn to the Large span tunnel using sliding-resistant system of the invention, specific technical solution
It is as follows:
Embodiment sliding-resistant system according to the invention using 8 having a size of 2000 × 3000 friction pile 7, heel row friction pile
It is 5, front-seat friction pile is 3 corresponding with the centre 3 of heel row friction pile.
5 friction piles 7 of heel row friction pile are connected with the crown beam 15, coupling beam 11 and ground coupling beam 9 that size is 1500 × 3000
It connects, ground upper section is all 18m, intermediate friction pile build-in 19.25m, the equal build-in 14.25m of 4 piles of intermediate friction pile two sides.
The front-seat equal build-in 15.75m of 3 friction piles, each other with the ground coupling beam 9 having a size of 1500 × 3000 in its friction pile
7 tops link together.
Front two rows friction pile is with the ground coupling beam 9 having a size of 2000 × 1500 and having a size of 2000 × 2000 and anti-with heel row
The diagonal brace 16 that sliding pile angle is 45 ° connects, and constitutes integral frame structure.
The anchor rope 13 being arranged on heel row friction pile, intermediate friction pile top is arranged one, with horizontal plane at 30 ° of angles；
Two are respectively set on close to the two sides friction pile 7 of central pile, with horizontal plane at 20 ° of angles；On the friction pile 7 in two outsides respectively
Setting 4, with horizontal plane at 20 ° of angles.
Grouting and reinforcing is carried out to the Rock And Soil on front side of front-seat friction pile, to reinforce the carrying energy of Rock And Soil and retaining structure
Power, and then Reducing distortion.
Large span tunnel as shown in FIG. 6 is just wearing the construction method of the retaining structure of existing barricade, comprising the following steps:
Step 1: preparation of construction
1, construction survey is carried out in the area Sui Zhi 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 at hole or so and peripheral sideline；
2, to be built friction pile 7 are measured near tunnel contour line at the hole measured according to construction design drawing
It sets, and marks its sequence of construction；
3, according to the position profile of construction design drawing and the heel row friction pile measured, survey sets out anchor rope 13 to be applied
Position.
Step 2: the ruggedized construction construction of the existing barricade in hole
1, position is set according to the survey of friction pile 7, while four friction piles 7 of front and rear row two sides of constructing and heel row center
A friction pile 7 to ground coupling beam 9 bottom surface elevation at；
2, and then a friction pile 7 of the front-seat center position of construction and remaining two friction piles 7 of heel row connect to ground
At 9 bottom surface elevation of beam；
3, the reinforcing bar for setting up ground coupling beam 9, presets 16 reinforcing bar of diagonal brace at stake end cushion cap 10, and support ground 9 template of coupling beam is whole
The stake end cushion cap 10 for pouring ground 9 component of coupling beam and front-seat friction pile stake end, makes front and rear row friction pile form an overall structure；
4, the position of the anchor rope 13 set according to survey, the anchor rope 13 between construction ground coupling beam 9 and coupling beam 11, ground lower end are logical
It crosses slip casting to be fixed in basement rock supporting body 1,7 end of friction pile is fixed with anchor pull head 14；
5, reinforcement placing presets 16 steel of diagonal brace in the junction of the corresponding heel row friction pile of front-seat friction pile and coupling beam 11
Muscle, support shuttering, one-piece casting coupling beam 11 and friction pile 7 below；
6, continue the anchor rope 13 constructed between crown beam 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 7 end of friction pile is fixed with anchor pull head 14；
7, reinforcement placing, the template of construction friction pile 7, rib column 12 and crown beam 15, one-piece casting concrete form whole knot
Structure；
8, the template of construction diagonal brace 16, lays reinforcing bar, and casting concrete completes the construction of entire retaining structure；
9, after front-seat friction pile reaches intensity requirement, grouting and reinforcing can be carried out to the Rock And Soil in front of it.
Step 3: tunnel portal construction
1, multiple-arch tunnel is excavated inside rock mass to from the barricade of hole using central drift method in the present embodiment；
2, middle drift is first excavated when constructing tunnel, advanced 5~10m of tunnel tunnel face applies interim liner structure and tunnel
Mid-board；
3, 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, its intensity, Reducing distortion are enhanced；
4, after tunnel is excavated using benching tunneling method, tunnel lining structure 19 is applied in time, forms closed ring structure,
It is mobile with the Rock And Soil sedimentation and the gliding mass 3 that reduce top；
5, tunnel structure all applies face upward slope supporting and retaining system and be linked to be entirety with existing supporting and retaining system after, first abolish pilot tunnel portal and timely
Crack is blocked, then tunnel portal barricade is abolished again and applies tunnel structure in time, blocks crack, the portal for completing tunnel is applied
Work；
6, after tunnel structure evagination certain distance, tunnel portal 20 is applied, completes the construction that barricade is just being worn in tunnel.
Example proves that the retaining structure construction method that Large span tunnel of the invention is just wearing existing barricade is suitable for Large span tunnel
The operating condition of the existing barricade in the hole slope Zheng Chuanyang.The retaining structure design that Large span tunnel in the present invention is just wearing existing barricade is simple,
Consumptive material is less, and appearance is beautiful, easy for construction, and construction method arranges compact, can effectively shorten the duration, realize long span tunnel
The supporting and retaining system for facing upward the existing barricade on slope is reinforced, and control slope sliding and deformation reduce construction disturbance and to the shadow for closing on traffic operation
It rings, reduces construction risk, save project cost.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand 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 (5)
1. the retaining structure that Large span tunnel is just wearing existing barricade, which is characterized in that including retaining structure (6), friction pile (7) and note
It starches reinforcing body (8), the friction pile includes front-seat friction pile and with heel row friction pile, the friction pile at position among heel row friction pile
Corresponding with front-seat friction pile, heel row friction pile is tightly attached on retaining structure, and heel row friction pile is higher than front-seat friction pile, and front row is anti-
The adjacent friction pile of heel row friction pile of the stake top in same elevation between the stake top of the adjacent friction pile of sliding pile, with front-seat friction pile
Between be fixedly installed with ground coupling beam (9), with heel row friction pile on same elevation of the stake top of front-seat friction pile and front-seat antiskid
It is fixedly connected between stake by ground coupling beam, heel row friction pile top is fixedly installed with crown beam (15), crown beam and heel row antiskid
Coupling beam (11) are fixedly installed between ground coupling beam in stake, be fixedly mounted between the coupling beam and crown beam it is several be used to reinforce supporting and retaining system
The rib column (12) of structure, the retaining structure are equipped with the pull-type anchor rope for penetrating retaining structure and heel row friction pile, and front row is anti-
Diagonal brace (16) are fixedly mounted with corresponding heel row friction pile top in the stake top of sliding pile, the one end of diagonal brace far from front-seat antiskid stake top
It is connected to the position that heel row friction pile intersects with coupling beam or crown beam, is connected between diagonal brace, front-seat friction pile and heel row friction pile
Wedge-shaped frame structure is formed between beam and corresponding heel row friction pile, the pull-type anchor rope penetrates existing barricade and supporting and retaining system knot
Structure, described anchor rope one end are fixedly mounted in heel row friction pile by anchor pull head (14), and the other end is fixed on base by slip casting
In rock supporting body (1), the grouting and reinforcing body (8) is mounted on around friction pile, to the Rock And Soil of stress side around friction pile into
Row grouting and reinforcing.
2. the construction method that a kind of Large span tunnel is just wearing the retaining structure of existing barricade, which is characterized in that work progress include with
Lower step:
Step 1: preparation of construction, comprising the following steps:
1) according to design drawing, survey sets out center line and outer contour of the tunnel portal on existing barricade；
2) it combines design drawing and surveys 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) it combines design drawing and surveys the tunnel portal and friction pile position contour line set out, 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, comprising the following steps:
1) the friction pile position profile that sets is surveyed according to step 1, according to quincuncial sequence of construction interval construction friction pile to company
Soffit elevation；
2) integral erection reinforcing bar and template, one-piece casting coupling beam and front-seat friction pile top cushion cap, 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 1, the anchor rope between coupling beam of constructing and ground coupling beam integrally pours
Build coupling beam and friction pile below；
4) the anchor rope position for setting out and marking is surveyed according to step 1, the anchor rope between crown beam of constructing and coupling beam, one-piece casting
Crown beam and friction pile below, rib column；
5) inclined support structure is applied, the construction of entire 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 construction, comprising the following steps:
1) the retaining structure construction of existing barricade described in step 2 is completed after entering the maintenance stage, can carry out constructing tunnel；
2) according to the portal profile that sets of survey, punched on the existing barricade above arch using drilling machine, 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 apply；
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, the method for diligent measurement, fast supporting, to guarantee construction safety.
3. the construction method that Large span tunnel as claimed in claim 2 is just wearing the retaining structure of existing barricade, which is characterized in that step
In rapid two 1) described in friction pile quincunx sequence of construction, refer to according to the position contour line of friction pile set is surveyed, first construct
The friction pile of heel row center position and the friction pile at two sides interval and front-seat friction pile not corresponding therewith, are all poured into ground
At the bottom surface elevation of coupling beam, remaining friction pile is and then constructed at the bottom surface elevation of ground coupling beam.
4. the construction method that Large span tunnel as claimed in claim 3 is just wearing the retaining structure of existing barricade, which is characterized in that step
In rapid two 3) described in one-piece casting coupling beam, refer to and 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 column in upside.
5. the construction method that Large span tunnel as claimed in claim 4 is just wearing the retaining structure of existing barricade, which is characterized 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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| CN113957815B (en) * | 2021-11-30 | 2022-10-04 | 中铁二十局集团第五工程有限公司 | Construction method for medium-large-diameter double-hole steel corrugated pipe culvert of highway |
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Effective date of registration: 20191213 Address after: 400044 Shapingba street, Shapingba District, Chongqing, No. 174 Co-patentee after: No.5 Engineering Corporation Limited of CR22G Patentee after: Chongqing University Address before: 400044 Shapingba street, Shapingba District, Chongqing, No. 174 Patentee before: Chongqing University |