CN209228377U - A kind of multistage set arch structure and pipe canopy set arch structure for tunnel portal supporting - Google Patents

A kind of multistage set arch structure and pipe canopy set arch structure for tunnel portal supporting Download PDF

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Publication number
CN209228377U
CN209228377U CN201822024555.6U CN201822024555U CN209228377U CN 209228377 U CN209228377 U CN 209228377U CN 201822024555 U CN201822024555 U CN 201822024555U CN 209228377 U CN209228377 U CN 209228377U
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China
Prior art keywords
arch
multistage
pipe
steel pipe
tunnel portal
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CN201822024555.6U
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Chinese (zh)
Inventor
柏署
向建军
傅立新
易震宇
蒋胜波
阳军生
蒋正华
任会
史晓琼
熊建军
杨雄
王明明
王海林
李金鑫
王木群
王建华
何颖
陈兆
李箐
刘汉宏
黄欣
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Central South University
Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
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Central South University
Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
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Abstract

The utility model discloses a kind of multistage set arch structures for tunnel portal supporting, including the multiple sets arch being arranged along hillside face, multiple sets encircle arranged adjacent, and the stepped arrangement in lower part of multistage set arch structure, multistage, which covers, offers multiple orifice tubes for being used to install pipe boron steel pipe in arch structure.The utility model also provides a kind of pipe canopy for tunnel portal supporting and covers arch structure, and including above-mentioned multistage set arch structure and pipe boron steel pipe, the pipe boron steel pipe is inserted in the orifice tube integral with set arch connection.The multistage set arch structure of the utility model is without all excavating the part other than penumbra, it only needs to open up construction slot on a small quantity in the foot that each set encircles, former massif side slope is disturbed less, excavated volume is few, free face is small, tunnel is constructed under the strong supporting of pipe canopy set arch structure prior involvement, more safety and environmental protection.

Description

A kind of multistage set arch structure and pipe canopy set arch structure for tunnel portal supporting
Technical field
The utility model belongs to constructing tunnel field more particularly to a kind of set arch structure and pipe canopy set arch structure.
Background technique
In recent years, Tunnel Engineering construction is increasing, and tunnel excavation method is increasingly taken seriously, various tunnel excavation sides Method is also come into being, and throat of the tunnel portal as engineering, which builds especially needed research.For soft rock-soil layer, collapse Collapse the unfavorable geologies such as body, and tunnel portal position rock-soil layer is relatively broken looser, easily form landslide, collapse etc..Portal Section Construction Usually first setting pipe canopy covers arch, then carries out boring construction.
The setting of conventional tube canopy is in penumbra, and according to general provision, penumbra is that earthing is pushed up greater than at 1.5m in hole. Part other than penumbra, Rock And Soil need to be excavated all, tunnel slope and faced upward slope and are commonly formed Slope with multi-step, free face and Excavated volume is big, thus tunnel portal becomes the maximum place of construction risk, not only uneconomical but also dangerous.
Utility model content
Technical problem to be solved in the utility model is to overcome the shortcomings of to mention in background above technology and defect, is provided The multistage set arch structure and pipe canopy for tunnel portal supporting that a kind of excavated volume is few, free face is small cover arch structure.On solving State technical problem, the utility model proposes technical solution are as follows:
A kind of multistage set arch structure for tunnel portal supporting, including the multiple sets arch (at least two being arranged along hillside face A set encircles), multiple sets encircle arranged adjacents, and the stepped arrangement in lower part of multistage set arch structure, multistage cover in arch structure It offers multiple for installing the orifice tube of pipe boron steel pipe.
In above-mentioned multistage set arch structure, it is preferred that the top of multiple set arches is located at same level.
In above-mentioned multistage set arch structure, it is preferred that the bottom of tunnel portal outermost set arch is concordant with road ground line, The bottom of remaining set arch gradually rises along hillside face.
In the utility model, tunnel portal most inner side set, which arches upward, is a little located at eaves and massif on multistage set arch structure backer side Concordant position, outermost set arch height of foundation and open cut tunnel basis are consistent, remaining set encircles position, highly with quantity according to massif Depending on topographic and geologic condition and construction demand.It can be zero earthing that tunnel portal most inner side, which covers dome portions, or have covering for relatively small thickness Soil.
In above-mentioned multistage set arch structure, it is preferred that the orifice tube in the adjacent set arch is corresponded and is interconnected.By Multistage set arch structure in the utility model is composed of multiple sets arch, needs to guarantee the hole in each set arch in work progress Mouth pipe is interconnected, in order to subsequent insertion tube boron steel pipe.
In above-mentioned multistage set arch structure, it is preferred that each set arch includes I-shaped steel skeleton, and the orifice tube passes through solid It is affixed integral with I-shaped steel skeleton to determine reinforcing bar.Set arch can be formed after casting concrete on I-shaped steel skeleton, for branch Support fixing pipe boron steel pipe.
As a general technical idea, the utility model also provides a kind of pipe canopy set arch knot for tunnel portal supporting Structure, including above-mentioned multistage set arch structure and pipe boron steel pipe, the pipe boron steel pipe is inserted in the orifice tube and set arch connection It is integral.The pipe canopy set arch structure of the utility model is suitable for the constructing tunnel of the geographical conditions such as soft rock-soil layer section, pipe canopy Set arch can provide advance support for constructing tunnel, guarantee the safety of constructing tunnel.
In above-mentioned pipe canopy set arch structure, it is preferred that the pipe boron steel pipe includes hole steel floral tube and non-porous steel pipe, described to have Hole steel floral tube is arranged alternately with non-porous steel pipe.In the actual operation process, it should be first equipped with hole steel floral tube, break non-porous steel after slip casting again Pipe, non-porous steel pipe can be used as inspection pipe, check grouting quality.Drilling machine vertical shaft direction must accurately control, to guarantee aperture Hole is often drilled a hole just one root canal boron steel pipe of jacking to correct, should be through measuring the inclined of rod boring frequently with inclinometer in drilling Gradient, discovery deflection are more than design requirement, timely correction.
In above-mentioned pipe canopy set arch structure, it is preferred that when roadbed is straight line in tunnel, control pipe boron steel pipe is parallel in roadbed Axis when roadbed is curve in tunnel, controls the starting point of pipe boron steel pipe to the intersection point distance k of pipe boron steel pipe and roadbed central axes It is 0.828 times of pipe boron steel pipe overall length.Above-mentioned setting is to reduce pipe boron steel pipe intrusion excavation contour line as far as possible.
The utility model also provides a kind of construction method of pipe canopy set arch structure, comprising the following steps:
S1: it determines the construction location of tunnel portal most inner side set arch, and opens up on hillside for accommodating tunnel portal most The construction slot of inner sleeve arch bottom;
S2: it in the I-shaped steel skeleton and orifice tube for excavating part installing set arch, is poured under the action of set encircles shaping template Set arch;
S3: repeating step S1 and S2 and be sequentially completed pouring for multiple set arches, so that multiple sets is encircleed each self-stabilization and is fixedly arranged on hillside On, when excavating every time, retain the Core Soil part of excavation face;
S4: pipe boron steel pipe is installed in multistage set arch structure by orifice tube, forms steel pipe supporting section;
S5: injecting cement slurry in pipe boron steel pipe, and fills up the gap in pipe boron steel pipe and orifice tube, optionally exists Backfill a part soil at the top of multistage set arch structure, the i.e. construction of completion pipe canopy set arch structure.
The utility model also provides the construction method of another pipe canopy set arch structure, comprising the following steps:
S1: determining the construction location of multistage set arch structure, and opens up on hillside for accommodating multistage set arch structure bottom Construction slot;When excavation, retain the Core Soil part of excavation face;
S2: respectively covering the I-shaped steel skeleton and orifice tube of arch in excavating the multistage set arch structure of part installing, shapes in set arch By multistage set arch structure one-time-concreting molding under the action of template;
S3: pipe boron steel pipe is installed in multistage set arch structure by orifice tube, forms steel pipe supporting section;
S4: injecting cement slurry in pipe boron steel pipe, and fills up the gap in pipe boron steel pipe and orifice tube, optionally exists Backfill a part soil at the top of multistage set arch structure, the i.e. construction of completion pipe canopy set arch structure.
In above two construction method, former is set arch step-by-step construction, and latter is set arch integral construction, step-by-step construction It can reduce soil body exposure duration, integral construction covers the good integrity of arch.
Compared with the prior art, the advantages of the utility model are:
1, conventional sleeve arch is generally located on penumbra, for the needs of construction, part other than penumbra, and rock The soil body need to be excavated all, tunnel slope and face upward slope Slope with multi-step is commonly formed, and free face and excavated volume are big, and free face needs a large amount of Safeguard procedures (usually to hang steel mesh, beat anchor pole, pneumatically placed concrete etc. as preventive means), to ensure to face upward in tunnel holing through front Slope is stablized, not only uneconomical but also dangerous.The multistage set arch structure of the utility model is not necessarily to the part other than penumbra is complete Excavate in portion, it is only necessary to open up construction slot on a small quantity in the foot of each set arch, less to the disturbance of former massif side slope, excavated volume is few, faces sky Face is small, therefore face-upward slope is not necessarily to additional safeguard procedures, and tunnel is constructed under the strong supporting of pipe canopy set arch structure prior involvement, more Add safety and environmental protection.
2, the stability of the pipe canopy set arch structure of the utility model, stress performance are excellent, can ensure the peace of constructing tunnel Entirely.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is this Some embodiments of utility model, for those of ordinary skill in the art, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the structural schematic diagram that pipe canopy covers arch structure.
Fig. 2 is the partial enlarged view of A in Fig. 1.
Fig. 3 is the location diagram of multistage set arch structure and hillside face.
Fig. 4 is the side view of multistage set arch structure and pipe boron steel pipe.
Fig. 5 is the cross-section diagram in the face A-A in Fig. 3.
Fig. 6 is the cross-section diagram in the face B-B in Fig. 3.
Fig. 7 is the cross-section diagram in the face C-C in Fig. 3.
Marginal data:
1, set arch;2, pipe boron steel pipe;3, orifice tube;4, I-shaped steel skeleton;5, fixed steel bars;L1, hillside face;L2, road Ground line;L3, massif excavation face;L4, tunnel vault structure lines;L5, traditional shadow line.
Specific embodiment
For the ease of understanding the utility model, below in conjunction with Figure of description and preferred embodiment to the utility model Work more comprehensively, meticulously describes, but the protection scope of the utility model is not limited to embodiment in detail below.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, and being not intended to limitation, this is practical Novel protection scope.
Embodiment:
As shown in Figs 1-4, the multistage set arch structure for tunnel portal supporting of the present embodiment, including set along hillside face L1 3 sets set encircle 1,3 sets and encircle 1 arranged adjacent and be respectively stabilized, the stepped arrangement in lower part of multistage set arch structure, more It is offered in grade set arch structure multiple for installing the orifice tube 3 of pipe boron steel pipe 2.In Fig. 2, L4 is tunnel vault structure lines.Such as Shown in Fig. 3, multistage set arch structure is located at the tradition left side shadow line L5, and traditional set arch 1 is located at traditional shadow line At L5.
In the present embodiment, the top of 3 set arches 1 is located at same level.The bottom and road of tunnel portal outermost set arch 1 Road ground line L2 is concordant, and the bottom of remaining 2 set arches 1 gradually rises along hillside face L1.
In the present embodiment, the orifice tube 3 in adjacent set arch 1 is corresponded and is interconnected.
In the present embodiment, each set arch 1 includes I-shaped steel skeleton 4, and orifice tube 3 passes through fixed steel bars 5 and I-shaped reinforcing bar Frame 4 is welded into a whole, when welding, using two-sided welding.
The pipe canopy for tunnel portal supporting of the present embodiment covers arch structure, including above-mentioned multistage set arch structure and pipe boron steel Pipe 2, pipe boron steel pipe 2 are inserted in orifice tube 3 integral with set arch connection.
In above-mentioned pipe canopy set arch structure, circumferential distance, steel pipe construction between the specification of pipe boron steel pipe 2, each orifice tube 3 are missed The poor connector quantity with the pipe boron steel pipe 2 in same cross section can be depending on actual loading demand.For example pipe boron steel pipe 2 can be with Using the steel pipe for saving a length of 3m and 6m, the steel pipe of 3m and 6m are connected by threaded joint, a length of 15cm of screw thread, in order to connect steel pipe Head is staggered, and the steel of 6m can be used in the steel pipe for using different sections long near the adjacent steel pipe of a section of tunnel portal, subsequent steel pipe Pipe.
The present embodiment also provides a kind of construction method of above-mentioned pipe canopy set arch structure, comprising the following steps:
S1: it determines the construction location of tunnel portal most inner side set arch 1, and opens up on hillside for accommodating tunnel portal most Inner sleeve encircles the construction slot of 1 bottom;
S2: in the I-shaped steel skeleton 4 and orifice tube 3 for excavating part installing set arch 1, under the action of set encircles 1 shaping template Pour set arch 1;To guarantee that the position of I-shaped steel skeleton and orifice tube 3 must not move when pouring, one-time-concreting molding;
S3: it repeats step S1 and S2 and is sequentially completed pouring for other two set arch 1, so that multiple sets is encircleed 1 each self-stabilization fixed In on hillside, when excavating every time, retain the Core Soil part of excavation face;
S4: after the completion of set arches 1 at different levels perform, drilling, borehole cleaning, insertion tube boron steel pipe 2 form steel pipe supporting section;
S5: cement slurry (early strength agent can be added in right amount) is injected in pipe boron steel pipe 2, and fills up pipe boron steel pipe 2 and orifice tube 3 Interior gap, optionally backfill a part is native at the top of multistage set arch structure, i.e. the construction of completion pipe canopy set arch structure.
Certainly, the multistage set arch structure in the pipe canopy set arch structure in the present embodiment can also be applied in construction using whole It makes, one-pass molding, it is only necessary to first install a pouring molding after the skeleton and typified form of a lot of grade set arch structures.
In order to illustrate the advantage of the multistage set arch structure in the present embodiment, the present embodiment is described as follows herein in connection with Fig. 5-7.Figure 5 (for the needs of construction, can also change massif with massif excavation face L3 location diagram for tunnel portal most inner side set arch 1 The positional relationship of excavation face L3 and most inner side set arch 1), as seen from the figure, most inner side set arch 1 is built, when opening up construction slot, without digging Too many massif is removed, the construction of most inner side set arch 1 can be completed.Similarly, as shown in Figure 6,7, when building remaining two sets arch 1, Without cutting out too many massif.The multistage set arch structure in the present embodiment is built, on the whole, being not necessarily to will be other than penumbra Part (i.e. the massif of traditional shadow line L5 left-hand component in Fig. 3) all excavate, it is only necessary to it is few in the foot of each set arch 1 Amount opens up construction slot, less to the disturbance of former massif side slope, and excavated volume is few, and free face is small, small to the original ecological environment destruction of massif, Tunnel is constructed under the strong supporting of pipe canopy set arch structure prior involvement, more safety and environmental protection.
In other embodiments, the quantity of set arch 1 can also be other quantity, such as 2,4,5 in multistage set arch structure It is a or more, can the gradient, geological conditions according to massif etc. determine.

Claims (6)

1. a kind of multistage set arch structure for tunnel portal supporting, which is characterized in that more including being arranged along hillside face (L1) A set encircles (1), and multiple sets encircle (1) arranged adjacent, and the stepped arrangement in lower part of multistage set arch structure, multistage set arch knot It is embedded in structure multiple for installing the orifice tube (3) of positioning pipe boron steel pipe (2).
2. multistage set arch structure according to claim 1, which is characterized in that the top of multiple set arches (1) is located at same One horizontal plane.
3. multistage set arch structure according to claim 1, which is characterized in that the bottom of tunnel portal outermost set arch (1) Concordant with road ground line (L2), the bottom of remaining set arch (1) gradually rises along hillside face (L1).
4. multistage set arch structure according to any one of claim 1-3, which is characterized in that in the adjacent set arch (1) Orifice tube (3) correspond and be interconnected.
5. multistage set arch structure according to any one of claim 1-3, which is characterized in that each set arch (1) wraps It includes I-shaped steel skeleton (4), the orifice tube (3) is affixed integral by fixed steel bars (5) and I-shaped steel skeleton (4).
6. a kind of pipe canopy for tunnel portal supporting covers arch structure, which is characterized in that including any one of claim 1-5's The multistage set arch structure and pipe boron steel pipe (2), the pipe boron steel pipe (2), which is inserted in the orifice tube (3), encircles (1) with set It connects integral.
CN201822024555.6U 2018-12-04 2018-12-04 A kind of multistage set arch structure and pipe canopy set arch structure for tunnel portal supporting Active CN209228377U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110985057A (en) * 2019-12-25 2020-04-10 云南交投公路建设第四工程有限公司 Construction method for tunneling hidden excavation and hole entering under combined advanced support of cover beam and pipe shed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110985057A (en) * 2019-12-25 2020-04-10 云南交投公路建设第四工程有限公司 Construction method for tunneling hidden excavation and hole entering under combined advanced support of cover beam and pipe shed

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