CN211144503U - High steep topography bridge tunnel meets section open cut tunnel and connects long structure - Google Patents

High steep topography bridge tunnel meets section open cut tunnel and connects long structure Download PDF

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Publication number
CN211144503U
CN211144503U CN201920649215.4U CN201920649215U CN211144503U CN 211144503 U CN211144503 U CN 211144503U CN 201920649215 U CN201920649215 U CN 201920649215U CN 211144503 U CN211144503 U CN 211144503U
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open cut
tunnel
cut tunnel
concrete
foundation
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白明禄
于介
范存斌
邓启华
赵圆圆
项育德
陈如海
李明波
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China Railway 22nd Bureau Group Co Ltd
Fifth Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
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China Railway 22nd Bureau Group Co Ltd
Fifth Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
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Abstract

The utility model belongs to the technical field of tunnel engineering, a high steep topography bridge tunnel meets section open cut tunnel and connects long structure is disclosed, high steep topography bridge tunnel meets section open cut tunnel and connects long structure and includes: the method comprises the following steps of 1.5 m-thick deepened open cut tunnel lining, phi 1.5m fender piles (which also serve as lining foundation piles), crown beams, transverse support beams, dry rubble layers, gravel filter layers, longitudinal drainage blind ditches, exposed pile body facing walls, foundation pit backfilling C20 concrete, paving under beams, bentonite waterproof blankets and EVA waterproof boards, concrete retaining walls and foundation pit anchor net spraying protection; the utility model discloses a structural design of "open cut tunnel + pile foundation, hat beam" has played the safety protection effect to the route, and guarantee operation safety, extension open cut tunnel have reduced the disturbance damage to the natural side slope, are favorable to soil and water conservation, have good ecological environment benefit.

Description

High steep topography bridge tunnel meets section open cut tunnel and connects long structure
Technical Field
The utility model belongs to the technical field of tunnel engineering, especially, relate to a high steep topography bridge and tunnel meets section open cut tunnel and connects long structure.
Background
Currently, the current state of the art commonly used in the industry is such that:
with the large-scale new construction of high-speed rails, the tunnel is longer and more complicated to deal with adverse geological conditions. Under the control of line direction, longitudinal slope design and station position, the tunnel portal location selection is usually deep and downward, the terrain is high and steep, bedrock above the portal weathers and peels off for a long time, the problem of dangerous rock falling generated by unloading cracks is prominent, and the influence on the operation safety is great. The conventional open cut tunnel lengthening method comprises the following steps: one method is that the tunnel adopts the method of pouring an arch open cut tunnel by an arch ring steel frame and an internal mold for installing a fiber concrete slab to carry out the construction of the lengthened open cut tunnel. And the other method is to adopt a method of changing a lining side wall into an enlarged foundation and hoisting a precast concrete arch ring to be connected with the foundation to carry out the construction of the lengthened open cut tunnel. And the other method is that aiming at the defects of slump and landslide of the loess surface layer of the tunnel group, steel sheet piles are driven to reinforce the side slope of the roadbed, the wing walls at the opening end of the tunnel are removed section by section, a foundation pit is excavated to be used as the side wall of the lengthened open cut tunnel, and then the open cut tunnel is lengthened by pouring the concrete of the arch part by using an arch frame vehicle at the skylight point.
In summary, the problems of the prior art are as follows:
the first method adopts the design of an arch frame and fiber concrete slab semi-fabricated open cut tunnel structure, is a light open cut tunnel structure, is not enough to resist diseases such as rain wash, downward seepage, slope surface slide collapse and landslide in high and steep loess collapse and gravity collapse sections, has low structural strength and short service life, needs long-term maintenance and overhaul, and has low operation safety and low economic benefit for reducing lines.
The second method adopts the assembly type lining concrete arch ring installed on the cast-in-place expansion foundation, is a light open cut tunnel structure, has low structural strength, weak bearing capacity and short service life, and needs to be maintained and overhauled for a long time, has large quality guarantee difficulty of longitudinal assembling, circumferential seam water stopping, water prevention and the like of the prefabricated concrete arch ring, and is suitable for the open cut tunnel construction of the cut open cut tunnel section of the single-track common railway.
In the third method, side wall foundations are excavated in an operation railway, a template is erected to pour side wall concrete, then a skylight point assembled arch truss vehicle is utilized, an insulating plate and vault template cast-in-place arch ring concrete are installed, and in the method, the skylight point or the travelling gap is utilized for construction several months before or several years after the operation is opened, so that the occupied resources are large, the economic benefit is low, and the operation interference is large. The method is only suitable for the construction of the lengthened open cut tunnel of the cutting open cut tunnel section of the single-track common railway.
Disclosure of Invention
To the problem that prior art exists, the utility model provides a high steep topography bridge tunnel meets section open cut tunnel and connects long structure.
The utility model is realized in such a way that the open cut tunnel lengthening structure of the high and steep terrain bridge and tunnel connecting section is provided with an open cut tunnel, the lower end of the open cut tunnel is provided with a fender post foundation, and two sides of the open cut tunnel are provided with anchor net spraying protective layers; foundation pit backfill concrete is arranged on two sides of the open cut tunnel, and a concrete retaining wall is arranged on the bias side of the open cut tunnel; 3 transverse supporting beams are transversely arranged; the fender pile is arranged by adopting long and short piles.
A top beam is arranged on the top pile top of the open cut tunnel pile foundation, a transverse reinforced concrete beam is arranged on the top beam, and a lower paving and longitudinal drainage ditch is arranged below the beam.
Open cut tunnel: deepening open cut tunnel lining by using a thick side wall of 70 cm;
the concrete retaining wall is tamped on the right side of the open cut tunnel, a grouted rubble layer is tamped on the right side of the concrete retaining wall, a reinforcing mesh is constructed on the right side of the grouted rubble layer, and concrete is filled in the reinforcing mesh; the periphery of the open cut tunnel is wrapped with a longitudinal blind pipe; and a broken stone filtering layer is laid on the right side of the open cut tunnel, a dry masonry stone layer is filled below the broken stone filtering layer, a crown beam is poured below the open cut tunnel foundation, a transverse supporting beam is poured between the left crown beam and the right crown beam, a vertebral body material backfill layer is filled at the lower part of the crown beam connected with the transverse supporting beam, and a fender post is fixedly connected below the crown beam.
Furthermore, the open cut tunnel adopts a horn inclined cut tunnel door.
Furthermore, the transverse supporting beams are provided with three channels.
Further, a tunnel construction access road is built at the upper part of the crown beam.
The open cut tunnel adopts a reinforced concrete curved wall to deepen the special open cut tunnel lining of the foundation, the foundation adopts a phi 150cm fender pile foundation, and the long pile and the short pile are designed. C20 concrete is used for backfilling the foundation pit, a rectangular longitudinal drainage blind ditch is arranged on the side close to the lining side wall, and dry rubbles and a gravel filtering layer are backfilled in the foundation pit above the ground line to drain water. A gravity type concrete retaining wall is arranged on the bias side of the open cut tunnel, connecting steel bars with the length of 1.53m phi 22 are arranged between the retaining wall and the open cut tunnel lining for connection, the distance between the retaining wall and the open cut tunnel lining is 50cm by 50cm, and the retaining wall and the open cut tunnel lining are arranged in a plum blossom shape. The top pile top of the open cut tunnel pile foundation is provided with a crown beam with the size of 2.85m by 1.4m (width by height), and the crown beam is provided with a longitudinal slope of 25 per mill. The crown beam is provided with a transverse C35 reinforced concrete beam with the thickness of 1.4m, and the exposed pile foundation is provided with a protective surface retaining wall. The lower part of the beam is provided with a paving layer under the beam and a longitudinal drainage ditch, which can drain the accumulated water of the bridge and the tunnel and can be used as an operation period maintenance channel.
The extension open cut tunnel is specially designed by 'arch ring + side wall deepening and expanding foundation', the open cut tunnel lining is of a C40 reinforced concrete structure, the arch part is 70cm thick, the foundation width is 276-338 cm, the size of a door opening of the horn tunnel is gradually enlarged, and the foundation pit depth of the extension open cut tunnel foundation is 10 m;
the diameter of the fender post is 1.5m, the design of long and short posts is adopted, and the spacing between the posts is 2 m;
the cross brace beams are cast by C35 reinforced concrete, three beams are arranged, the height of each beam is 1.4m, the bending moment and the vertical ultimate bearing capacity of the crown beam are reduced, and the length of the pile is shortened;
the lower part of the beam is provided with a paving and longitudinal drainage ditch under the beam, which can drain the accumulated water of the bridge and the tunnel and can be used as an operation period maintenance channel.
The filling thickness of the rammed filling stone layer is 2 m;
and (3) above the top surface of the crown beam, adopting anchor net spraying for temporary protection when the open cut tunnel foundation pit is excavated, adopting C25 concrete for 10cm thick, phi 8 reinforcing mesh @25 x 25cm and phi 22 mortar anchor rods for 3m long at a distance of 1.5 × 1.5.5 m, adopting C20 concrete for backfilling the foundation pit, arranging a rectangular longitudinal drainage blind ditch close to the side of the lining side wall, and backfilling dry masonry and a gravel filter layer above the ground line to drain water by means of planning.
The width of the top beam is 2.85m, the height of the top beam is 1.4m, the longitudinal slope is 25 per mill, a Bailey beam, a distribution beam and a steel paving plate can be built on the upper portion of the top beam during construction to serve as tunnel construction pavement transportation and site conditions, and bridge abutment construction is carried out on the lower portion of the Bailey beam to achieve up-and-down parallel operation.
To sum up, the utility model discloses an advantage and positive effect do:
(1) the construction method adopts the prior art, namely, an extended open cut tunnel adopts an extended foundation and semi-fabricated (or fabricated) lining structure, according to the similar previous engineering experience, the extended open cut tunnel extended foundation and a side wall are cast in advance, then an inner thin layer reinforced concrete arch prefabricated outside a field is hung on the top of the side wall by using a crane, and the inner thin layer reinforced concrete arch is connected by reinforcing steel bars pre-embedded on the top of the side wall, the inner layer prefabricated concrete lining is used as a bottom mould condition, an outer layer reinforced concrete lining is cast by a simple erecting template, ① the extended open cut tunnel extended foundation meets the requirement of excavating a foundation pit according to a bearing platform at the bridge and tunnel connection position, the extended foundation is a C35 reinforced concrete structure, the size is 4m ×.0m ×.2m, the side wall is a C40 reinforced concrete side wall, the thickness of the side wall is 1.0m, the height is 6m, the top is set as a slope surface to be connected with an arch part, the excavation amount is 4357m3, the extended foundation and the side wall construction amount is 3m, the foundation pit depth is increased, the pile diameter is increased, the distance of the foundation pit diameter is 1.3, the total number of the foundation pit is 30.3, the total number of the inner thin layer of the foundation is 1050.The unit blocks are prefabricated and assembled, the width of each block is 1.0m, and the engineering quantity is 8.4 × 22.2.2 m3=186.5m3④ cast-in-place concrete arch ring with outer layer of C40 reinforced concrete structure, thickness of 40cm, engineering quantity of 12.01 ×× 22.2.2 m3=266.6m3
This technical construction, the waterproof position of assembled structure is many, and the weak link is many, and stagnant water, waterproof quality are difficult to effectively guarantee, and through numerical simulation analysis and calculation, structural safety factor is only 1.77, is less than structural design factor of safety 2.0, is not enough to resist suffering diseases such as rain wash and the domatic top layer swift current slump of infiltration back, landslide, and structural strength is low, and need long-term maintenance, and is not high to the operation security that reduces the circuit.
(2) The bridge and tunnel connecting section open cut tunnel lengthening structure is constructed by adopting a novel high and steep terrain bridge and tunnel connecting section open cut tunnel lengthening structure technology, the bridge and tunnel connecting engineering penetrating deep V-shaped high and steep terrain adopts a scheme of 'open cut tunnel + pile foundation and crown beam', the lengthened open cut tunnel foundation and abutment foundation pit protection are combined forever, the continuity and the stability of the structure are ensured, the influence of the high and steep terrain dislocation, pushing and slumping on the safety of the bridge and tunnel foundation is prevented, ① open cut tunnel lining adopts a C40 reinforced concrete structure, the thickness of an arch part is 70cm, the quantity of the lengthened open cut tunnel engineering is 537m3② excavation volume of foundation pit is 3360m3③ fender pile diameter is 1.5m, long and short pile design is adopted, pile spacing is 2m, total pile number is 27, pile length is 645m, ④ crown beam width is 2.85m, height is 1.4m, length is 22.2m, engineering quantity is 240m3⑤ the cross-brace beam is cast by C35 reinforced concrete, three beams are arranged in total, the height of the beam is 1.4m, and the engineering quantity is 33m3
According to the technical construction, the open cut tunnel structure bears upper soil covering load and impact load, and can also be used as abutment deep foundation pit support, so that 'permanent temporary combination' is realized, the structural safety coefficient is minimum 11.93 through numerical simulation analysis and check calculation, the structural strength is high, the effect of preventing soil body stripping impact in the operation period is improved, and the construction is safe and reliable.
The two methods are compared: novel open cut tunnel high and steep topography bridge tunnel meets section open cut tunnel and connects long structure and practices thrift excavation engineering volume than prior art: 4357 997 m-3And foundation pit protecting pile foundation is saved: 1050-3And the economic benefit is good. The utility model discloses a build beret beam temporary platform on the hat beam, can solve the problem of the section construction process mutual interference restriction that meets of high and steep topography bridge tunnel betterly, realize tunnel and bridge construction parallel operation, the structural design of "open cut tunnel + pile foundation, hat beam" has played the safety protection effect to the route, guarantee operation safety, and the extension open cut tunnel has reduced the disturbance broken ring to the nature side slope, is favorable to soil and water conservation, has good ecological environment benefit.
Drawings
Fig. 1 is a schematic structural view of a structure for extending a open cut tunnel of a connecting section of a high and steep terrain bridge and tunnel provided by an embodiment of the present invention;
in the figure: 1. open cut tunnel and trumpet tunnel portal; 2. a fender pile; 3. a crown beam; 4. a transverse support beam; 5. a macadam filtration layer; 6. dry laying a rubble layer; 7. longitudinal drainage blind ditches; 8. exposed pile body facing wall; 9. backfilling concrete in the foundation pit; 10. paving a layer under the beam; 11. a bentonite waterproof blanket; 12. concrete retaining wall
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the open cut tunnel lengthening structure of the connecting section of the high and steep terrain bridge and tunnel is provided with an open cut tunnel 1, the lower end of the open cut tunnel 1 is provided with a foundation of a fender post 2, and two sides of the open cut tunnel 1 are provided with anchor net spraying protective layers; foundation pit backfill concrete is arranged on two sides of the open cut tunnel 1, and a concrete retaining wall 12 is arranged on the bias side of the open cut tunnel 1; three cross supporting beams are transversely arranged; the fender pile is arranged by adopting long and short piles. The embodiment of the utility model provides a high steep topography bridge tunnel meets section open cut tunnel and connects long structure includes: the method comprises the following steps of 1, 2, a top beam 3, a transverse supporting beam 4, a gravel filtering layer 5, a dry masonry layer 6, a longitudinal drainage blind ditch 7, an exposed pile body retaining wall 8, foundation pit backfill C20 concrete 9, 10 paving below the beam, 11 and 12, wherein the deep open cut tunnel is 70cm thick, and is a fender pile (also used as a lining foundation pile) with the diameter of 1.5 m;
the lower part of the open cut tunnel 1 is provided with a crown beam 3, the lower part of the crown beam 3 is provided with a phi 1.5m fender post (also used as a lining foundation pile) 2 by driving, the transverse supporting beam 4 of the crown beam 3 is provided with a gravity type concrete retaining wall 12 at the bias side of the open cut tunnel 1, the peripheries of the open cut tunnel 1 and the concrete retaining wall are wrapped with a bentonite waterproof blanket and an EVA waterproof board 11, a C20 concrete 9 is backfilled after a foundation pit of the open cut tunnel 1 is excavated, a dry masonry stone layer 6 and a macadam filtering layer 5 are constructed between the backfilled C20 concrete 9 and the open cut tunnel 1, the exposed phi 1.5m fender post (also used as a lining foundation pile) 2 is provided with a pile body guard surface wall 8, and the lower part of the transverse supporting beam 4 is provided;
the open cut tunnel 1 adopts a horn oblique cutting type tunnel portal, the open cut tunnel 1 adopts special design of 'arch ring + side wall deepening + pile foundation and crown beam', the open cut tunnel 1 is lined by adopting a C40 reinforced concrete structure, the arch part is 70cm thick, the size of the horn tunnel portal is gradually enlarged, the foundation width is 276-338 cm, and the foundation of the open cut tunnel 1 is lengthened to be excavated with the foundation pit depth of 10 m;
the fender pile 2 adopts a phi 150cm fender pile foundation and long and short pile design, comprehensively considers the protection function of the abutment deep foundation pit, and serves as a permanent bearing foundation in service in the operation period, so that permanent temporary combination is realized.
The size of the crown beam 3 is 2.85m by 1.4m (width by height), and the crown beam is provided with a longitudinal slope of 25 per mill. And during construction, a Bailey beam, a distribution beam and a steel plate are built on the upper part of the crown beam 3 to be used as a tunnel construction access road.
The transverse support beam 4 is cast by C35 reinforced concrete, and three transverse support beams are arranged in total and have the height of 1.4 m.
The gravity concrete retaining wall 12 and the open cut tunnel lining are connected by connecting reinforcing steel bars with the length of 1.53m phi 22, the distance between the connecting reinforcing steel bars and the open cut tunnel lining is 50cm by 50cm, and the connecting reinforcing steel bars and the open cut tunnel lining are arranged in a quincunx manner.
The utility model discloses a theory of operation:
1. basic work flow: maintaining pile foundation construction → excavating foundation pit for temporary slope protection → crown beam casting → excavating bridge abutment foundation pit → constructing top beret beam platform of crown beam → constructing bearing platform, bridge abutment → dismantling beret beam platform → continuous beam side span straight line segment casting, closure → bridge abutment top construction → constructing transverse support beam → erecting falsework construction open cut tunnel lining → foundation pit backfilling C20 concrete → casting bias side concrete retaining wall → laying bentonite waterproof blanket + EVA waterproof board → constructing dry masonry stone and laying macadam filter layer → completing project of lower beam and drainage ditch.
2. Construction of enclosure pile foundation and crown beam
The pile foundation construction is combined with geological conditions of a region, a pile foundation is drilled into a hole by adopting a rotary drilling rig, a construction method of pouring concrete by adopting a guide pipe after a reinforcement cage is lifted and placed after the hole is cleaned is adopted, and pile forming quality detection is carried out on all foundation piles by adopting a low-strain reflection wave method after the construction of the reinforced concrete cast-in-situ pile is completed for 28 days.
The method comprises the steps of excavating a foundation trench in the bridge abutment range in time after pile foundation construction is completed, excavating the foundation trench to the pile top height, adopting a manual cooperation excavator excavating method for a foundation pit, combining geological conditions, setting a slope-releasing condition of 1: 0.75-1: 1 during excavation, spraying C25 concrete for protection in a grid-connected mode, excavating a crown beam foundation trench vertically, circularly cutting and stripping a pile head, adopting a large steel formwork for hanging line assembly and forming, uniformly processing reinforcing steel bars, binding on site, embedding main reinforcing steel bars of an open cut tunnel structure during binding of the crown beam reinforcing steel bars, reserving the exposed length of the main reinforcing steel bars according to 75d, adopting pumping and layered pouring and inserting type concrete, vibrating a vibrating rod, and spraying water to cover and maintain after pouring is completed.
3. Construction for building Bailey beam platform
Because the lengthened open cut tunnel section wraps the bridge abutment and the bridge body and is limited by the terrain, the access way of the tunnel portal occupies the bridge position, and the bridge and the tunnel are under parallel construction, so that cross interference influence exists. In order to ensure the orderly organization of the bridge and tunnel construction without mutual interference, the Bailey beam, the distribution beam and the steel plate are built on the upper part of the crown beam during construction to serve as the conditions of transportation and site of tunnel construction pavement, and the lower part of the Bailey beam is constructed with the abutment bearing platform to realize the up-and-down parallel operation.
The utility model discloses a 2 double-row double-deck beiLei roof beam bases of 150 × 300cm are laid on the top of crown beam, then 150 single-row single-deck beiLei roof beam of 150 × 300cm is put on the base, use bolted connection between the beiLei roof beam, set up span 13.5m, arrange total width 15m, vertically 3m between the beiLei roof beam all uses supporting frame as horizontal relation, the beiLei roof beam is whole to be set up the back upper portion unknown I14I-steel distribution beam, interval 100cm, then the horizontal bridge direction sets up 12 × 12cm wooden square on the distribution beam, lays 15mm thick steel sheet and forms the platform of passing.
4. Construction of side span straight line segment, closure and abutment of continuous beam
And (3) removing the Bailey beam in front of the abutment when the side span straight line section of the continuous beam is constructed, removing all Bailey beam platforms after the continuous beam is folded, pouring the abutment top, backfilling the conical slope of the abutment and recovering the tunnel passing access way at the abutment back.
5. Lining construction for lengthened open cut tunnel
After the tunnel hidden hole is communicated, constructing and lengthening an open cut tunnel for lining, utilizing a finished continuous beam bridge deck as a platform, erecting a bowl buckle support falsework method for assisting construction, wherein the length of segmental construction is 6m, the transverse distance between the bowl buckle supports is 60cm, the longitudinal distance between the bowl buckle supports is 90cm, jacking and mounting longitudinal channel steel, mounting an inner mold on the channel steel, manufacturing an inner template by adopting a 40cm × 100cm customized assembling steel mold, firmly connecting bolts, sealing joints between the inner template and the template after the inner mold is mounted by adopting putty, assembling and molding the outer template by adopting a small steel template from a side wall to an arch part, fixing the small template and the inner template firmly by using a pull rod and a steel bar, manufacturing the steel bar and mounting a buried rubber waterstop at the end by adopting a 10mm thick steel plate to manufacture a segmented arc template, assembling on site, connecting and reinforcing the inner template by using the pull rod, mounting the inner and outer and end molds.
6. Backfilling a foundation pit with C20 concrete: and after the lining of the lengthened open cut tunnel is poured and the maintenance strength is 100% of the design strength, backfilling the open cut tunnel foundation pit below the ground line by using C20 concrete, erecting a wood template to seal the end, and pouring concrete by using an automobile pump into a warehouse.
7. Construction of bias side concrete retaining wall
The concrete retaining wall is poured by adopting a sectional vertical mold, the concrete is continuously poured without forming a horizontal through seam, the concrete is intensively mixed, the concrete is transported to the site by a concrete tank truck, and the concrete is conveyed into the mold by a conveying pump. In order to ensure the quality and effect of the stubble connection between the retaining wall and the open cut tunnel, the retaining wall and the open cut tunnel lining are connected by the stubble connection steel bars with the length of 1.53m phi 22, the spacing is 50cm by 50cm, and the retaining wall and the open cut tunnel lining are arranged in a plum blossom shape.
8. Waterproof carpet of bentonite and EVA waterproof board are laid
And (3) paving a needle-punched film-coated natural sodium bentonite waterproof blanket and an EVA waterproof board behind the lining of the lengthened open cut tunnel, arranging a longitudinal drainage blind ditch at the bottom of the wall foot of the bias side retaining wall, and leading and draining water to the position below the bridge.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.

Claims (2)

1. A high and steep terrain bridge and tunnel connecting section open cut tunnel extension structure is provided with an open cut tunnel, and is characterized in that the lower end of the open cut tunnel is provided with an enclosure pile foundation which is provided with a crown beam and a cross beam, and the lower end of the crown beam is fixedly connected with an enclosure pile;
the concrete retaining wall is tamped on the right side of the open cut tunnel, a grouted rubble layer is tamped on the right side of the concrete retaining wall, a reinforcing mesh is constructed on the right side of the grouted rubble layer, and concrete is filled in the reinforcing mesh; the periphery of the open cut tunnel is wrapped with a longitudinal blind pipe; paving a broken stone filtering layer on the left side of the open cut tunnel, and filling a dry rubble layer below the broken stone filtering layer;
3 transverse supporting beams are transversely arranged;
the fender pile is arranged by adopting long and short piles.
2. The open cut tunnel lengthening structure for the adjoining section of a high and steep terrain bridge and tunnel according to claim 1, wherein the crown beam is provided with a transverse reinforced concrete beam, and the lower part of the beam is provided with an underbeam paving and a longitudinal drainage ditch.
CN201920649215.4U 2019-05-08 2019-05-08 High steep topography bridge tunnel meets section open cut tunnel and connects long structure Active CN211144503U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920649215.4U CN211144503U (en) 2019-05-08 2019-05-08 High steep topography bridge tunnel meets section open cut tunnel and connects long structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920649215.4U CN211144503U (en) 2019-05-08 2019-05-08 High steep topography bridge tunnel meets section open cut tunnel and connects long structure

Publications (1)

Publication Number Publication Date
CN211144503U true CN211144503U (en) 2020-07-31

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Country Status (1)

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