CN205503149U - Special section mine method tunnel structure of circle varies from top to bottom - Google Patents

Abstract

The utility model relates to a special section mine method tunnel structure of circle varies from top to bottom. Receive the influence of building subway line and all ring edge borders, later stage subway line construction condition is harsh relatively, and special sectional mine method tunnel structure scheme is arisen at the historic moment. The utility model discloses a tunnel structure's section is the circular form that varies from top to bottom, semicircle under first is mediate, pass through through the straightway between the upper and lower semicircle, whole bilateral symmetry, upward semicircle curvature radius is lighter than semicircle curvature radius down, mainly acts on the construction through the bassoon canopy with the advance support who advances the formula stock certainly. The utility model discloses have the section arrange nimble, inside spatial regularization range big, the reliable advantage of supporting construction system, satisfies that the upper portion cross -section is little, the circular structural type of class of big this special requirement in lower part cross -section, can effectively avoid the conventional shape of a hoof or stalk circular arch mine method tunnel excavation profile phase to adverse effect great and that the atress performance is relatively poor relatively simultaneously, has extensive application space.

Description

One does not the most wait circle special cross section Tunneling by mining method structure

Technical field

This utility model belongs to tunnel construction technical field, is specifically related to one and does not the most wait circle special cross section Tunneling by mining method structure.

Background technology

Railway traffic engineering for current cities in China, continuous encryption along with subway gauze, when follow-up subway line is built, affected with surrounding enviroment by built subway line, stricter with the requirement of the aspects such as engineering measure with structural shape and construction method in line alignment and paving mode, spatial relationship.The conventional shape of a hoof or stalk circular arch Tunneling by mining method structural shape may be limited, by the space of periphery existing buildings, the condition that do not performs, and similar round Tunneling by mining method section structure has the advantages that outline excavation is relatively small, construction method has flexible and changeable, strong adaptability, the feature such as safe and reliable.

Summary of the invention

The purpose of this utility model is to provide one and does not the most wait circle special cross section Tunneling by mining method structure and construction method thereof, by structural stability measures such as super-front large pipe shed and the stratum pre-reinforcement measure of self-feeding anchor pile, CRD method digging construction method, grid steel frame and the interim type steel supports in inside, it is achieved the special Mining Method tunnel cross-section structural shape that cross section, top is little, lower section is big.

The technical scheme that this utility model is used is:

One does not the most wait circle special cross section Tunneling by mining method structure, it is characterised in that:

The section of described tunnel structure is not in waiting toroidal, including upper semi-circle and lower half circle；

By straightway transition between upper and lower semicircle, overall symmetrical, upper semi-circle radius of curvature is less than lower half circle radius of curvature.

Tunnel structure uses waterproof concrete cast, and outer ring has performed preliminary bracing, performs steel tube shed and self-feeding anchor pile outside preliminary bracing, the internal pressure injection cement mortar of steel tube shed；

Preliminary bracing is by grid steel frame, steelframe joint and sprays mixed composition；

Upper semi-circle grid steel frame foot is provided with lock foot anchor tube；

Grid steel frame uses grade III steel, and steelframe joint uses Q235 steel, and spray is mixed uses C25 early strength concrete；

Vertical interim type steel support it is provided with level to interim type steel support inside form steelframe.

Being provided with shield machine guide table bottom tunnel structure lower half circle inner ring, shield machine guide table uses fine-stone concrete cast.

This utility model has the advantage that

This utility model has up-small and down-big special circular cross-sectional configuration pattern, and provides a kind of novel Tunneling by mining method construction concept, enriches existing constructing tunnel technique, has widened Tunnel Design thinking.Steel tube shed, self-feeding anchor pile and preliminary bracing grid steel frame and the interim type steel support of tunnel internal setting that profile is provided above over tunnel, and the cement mortar of pressure injection in steel tube shed, liner structure with just now with concrete etc., steel, cement mortar, water-proof concrete and the steel tube shed related to sets plant equipment etc. used and is conventional material (equipment), its corresponding size is general type, it is simple to processing and manufacturing；And horizontal layout, the quantity of steel tube shed and self-feeding anchor pile can be adjusted according to condition of construction with length, steel tube shed rigidity can determine with steel pipe stiffness by itself information summary according to the cement mortar grade of internal filling, and grid steel frame can be adjusted flexibly according to construction monitoring situation with the longitudinal pitch of interim type steel support.Advanced stratum pre-reinforcement measure by steel tube shed Yu self-feeding anchor pile; grid steel frame and the setting of the interim type steel support in inside; and the continuous requirement of construction step that CRD engineering method breaks the whole up into parts; the safety of special circular Tunneling by mining method structure can be realized; reduce potential unsafe factor; reach to meet construction convenient; structure function can be met again and use requirement with inner space; the rigors of surrounding enviroment protection can be met, be avoided that again the ground routine shape of a hoof or the stalk circular arch tunnel excavation profiled outline adverse effect greatly to surrounding enviroment.There is higher economic benefit and social benefit, have wide practical use in the engineerings such as urban track traffic, railway, highway.

Accompanying drawing explanation

Fig. 1 is not wait circle special cross section Tunneling by mining method structure chart.

Fig. 2 is that tunnel support is longitudinally arranged schematic diagram.

Fig. 3 is that tunnel support arranges sectional drawing.

In figure, 1-tunnel structure, 2-preliminary bracing, 3-steel tube shed, 4-self-feeding anchor pile, 5-shield machine guide table, 6-grid steel frame, 7-steelframe joint, a spray is mixed at the beginning of 8-, and 9-level is to interim type steel support, and 10-vertically interim type steel support, 11-locks foot anchor tube.

Detailed description of the invention

Below in conjunction with detailed description of the invention, this utility model is described in detail.

This utility model relates to one and does not the most wait circle special cross section Tunneling by mining method structure, and the section of described tunnel structure 1 is not in waiting toroidal, including upper semi-circle and lower half circle.By straightway transition between upper and lower semicircle, overall symmetrical, upper semi-circle radius of curvature is less than lower half circle radius of curvature.Concrete radius of curvature size be embodied as scope, need to determine with inner space use requirement according to structure function.

Tunnel structure 1 uses waterproof concrete to pour into a mould, and outer ring has performed preliminary bracing 2, performs steel tube shed 3 and self-feeding anchor pile 4 outside preliminary bracing 2.Preliminary bracing 2 is made up of with spray mixed 8 grid steel frame 6, steelframe joint 7；Upper semi-circle grid steel frame 6 two ends foot is provided with lock foot anchor tube 11, and grid steel frame 6 is internally provided with 9 levels to the vertical interim type steel support of interim type steel support and 10；Grid steel frame 6 uses grade III steel, interim shaped steel and steelframe joint 7 to use Q235 steel, the mixed 8 employing C25 early strength concretes of spray.Grid steel frame 6 and the general desirable 0.5m of interim shaped steel longitudinal pitch are identical with tunnel longitudinally excavation step pitch.

Being provided with shield machine guide table 5 bottom tunnel structure 1 lower half circle inner ring, shield machine guide table 5 uses fine-stone concrete to pour into a mould.

The above-mentioned special cross section Tunneling by mining method structure of the circle such as the most not is mainly constructed by the advance support effect of steel tube shed 3 with self-feeding anchor pile 4, supporting in the early stage 2 is internal, requirement, the unequal special circular cross section structure of about two radiuses performed is used with inner space according to structure function.Specifically include following steps:

Step one: based on stratum pre-reinforcement requirement, quantity and pitch requirements is arranged according to pipe canopy, steel tube shed 3 is set in tunnel portal position, after pipe canopy length reaches design requirement, in time to the internal pressure injection cement mortar of steel tube shed 3, for guaranteeing to set precision and length requirement, steel tube shed 3 needs first to implement pipe canopy and guides wall before setting, and guiding the most pre-buried guide pipe, the longitudinal lap joint between adjacent steel tube shed 6 is not less than 3m；

Step 2: require to arrange dewatering well and water level observation hole according to design, the clear distance of dewatering well is considered as along about tunnel longitudinal pitch 15m, both sides, tunnel are respectively arranged a row, carry out dewatering construction, guarantee level of ground water about 1m below tunnel structure base plate, precipitation needs strictly control sand production rate, control the Stratum Loss that precipitation causes；

Step 3: set self-feeding anchor pile 4 below the tunnel place of punching steel tube shed 3, the layout of self-feeding anchor pile 4 need to stagger with steel tube shed 3, guaranteeing that self-feeding anchor pile 4 is arranged in blossom type in the plane with steel tube shed 3, the angle of self-feeding anchor pile and length are strictly performed by design requirement；

nullStep 4: according to CRD method excavating sequences requirement，Whole tunnel is divided into four part excavations，And press upper left quarter、Lower left quarter、Upper right quarter excavates successively with the order of right lower quadrant，Remaining core soil in advance is needed during every excavation，Set up grid steel frame 6 after excavation in time and spray mixed 8，By first setting up vertical interim type steel support 10，The level that sets up again is carried out to the order of interim type steel support 9，Sedimentation and deformation at strict control tunnel vault，After upper half section grid steel frame 6 sets up，Lock foot anchor tube 11 is performed in time at arch springing，And pressure injection cement-sodium silicate double liquid，Grid steel frame 6 connects into a preliminary bracing 2 closed by steelframe joint 7，Construct in strict accordance with the theory dug with supportting，Interim shaped steel longitudinally uses bar connecting gunite concrete，For avoiding multiple electrodes，The excavation progress of adjacent two the most at least differs one times of excavation span along tunnel；

Step 5: according to design requirement, beyond the certain distance of tunnel excavation face, to carrying out outside preliminary bracing 2 backfilling slip casting, it is ensured that preliminary bracing 2 is closely connected with tunnel perimeter country rock；

Step 6: after hole is logical, progressively remove interim type steel support, according to level of first removing to interim type steel support 9, the order removing vertical interim type steel support 10 again is carried out, the length every time removed, less than 0.5 times (about 3～5m) of tunnel excavation span, waterproof layer layings floating according to preliminary bracing 2 surface mortar subsequently, steel reinforcement cage colligation, two serves as a contrast the order poured and constructs；

Step 7: according to the curvature of upper and lower two circles with specifically perform area requirement, tunnel double-lining is divided into upper and lower two parts pour, according to first encircleing the principle of vault behind the end, first pour point two linings bottom arch (lower circle), after-pouring vault part (upper circle), use straightway transition between lower circle and upper circle, it is ensured that body structure surface smoothly transition, formed and do not wait circle special cross section Tunneling by mining method structure 1；

Step 8: after two linings reach certain design strength, by Grouting Pipe reserved on tunnel double-lining, carries out grouting filling to the space between two linings and preliminary bracing 2, it is ensured that blocked completely by the percolating water passage of two linings with preliminary bracing 2；

Step 9: a point employing C20 pea gravel concreten pours shield machine guide table 5 bottom arch, meets the demand that the logical rear shield machine air pushing in hole passes through, and the later stage can perform requirement according to railway roadbed and remove, or the part as ballast bed structure.

To find out theoretically and to adapt to Tunneling by mining method structure and the construction method thereof that arbitrary cross-section pattern requires, under the conditions of existing theoretical level with construction technology, still there is sizable difficulty, because Tunneling by mining method structure outline must be smoother to meet force request, in Practical Project, tunnel excavation is inevitable to the disturbance of surrounding formations to a certain extent, and Tunnel Engineering protection requires in addition to oneself factor, also need to the different requirements in view of surrounding enviroment, especially closing on existing subway station and tunnel, underground commerce synthesis, and hospital, in the case of school lays special stress on protecting object with laboratory etc., current Tunneling by mining method structure design and construction, still need to according to " pipe is advanced, tight slip casting, short excavation, strong supporting, early close, diligent measuring " basic principle of ten Eight Terms Guidelines carries out.

This utility model " the most not etc. circle special cross section Tunneling by mining method structure " refers mainly to that cross section, top is little, the similar round tunnel cross-section tectonic type of lower section this particular/special requirement big, has section flexible arrangement, inner space adjusts that amplitude is big, supporting structure system reliable and changes flexibly and adapt to the feature of all kinds of environmental requirement.Both the rigors of surrounding enviroment protection be can meet, the conventional shape of a hoof or the adverse effect that stalk circular arch Tunneling by mining method outline excavation is relatively large and stress performance is relatively poor turn avoid.Simultaneously, meet tunnel contour smoother with force request on the premise of, the curvature of upper and lower two circles with specifically perform scope, and the straight transitions segment limit between upper and lower two circles, can adjust accordingly according to Practical Project situation, add motility and adaptability.Can realize when city underground gauze begin to take shape, urban rail corridor has already taken up below major urban arterial highway in the case of main space, underground engineering remains to the purpose using special this conventional means of circular cross section Tunneling by mining method to implement.There is higher economic benefit and social benefit, have wide practical use in the engineerings such as urban track traffic, railway, highway.

In construction:

Steel tube shed 3 uses diameter 108mm, wall thickness 6mm steel floral tube, long 15m, circumferential distance 0.3m, arranges in the range of 150 °, arch, tunnel.The horizontal layout of steel tube shed 3, set length and need to determine according to design requirement with angle, longitudinal lap joint length etc., simultaneously at internal grouting methol.

Self-feeding anchor pile 4 uses diameter 32mm, 4mm steel floral tube after wall, and long 3～5m, arrange in the range of 150 °, arch, tunnel, ring longitudinal pitch can be 0.3 × 2.5m.The horizontal layout of self-feeding anchor pile 4, set angle and need to determine according to design requirement with angle, longitudinal lap joint length etc..

Lock foot anchor tube 11 uses diameter 42mm, the steel floral tube of wall thickness 3.5mm, internal pressure injection cement-sodium silicate double liquid, welds with grid steel frame 6, and longitudinal pitch is identical with grid steel frame 6.

The internal need of preliminary bracing 2 sets up vertical interim type steel support 10 with level to interim type steel support 9, and the erection of type steel support need to match with tunnel excavation operation, according to after the most vertical interim type steel support 10, level is to the sequence construction of interim type steel support 9, and the longitudinal pitch of type steel support is identical with grid steel frame 6.

This utility model justifies the radius of curvature of two circles up and down of special cross section Tunneling by mining method structure and the adjustment being embodied as scope by not waiting, and the corresponding adjustment of upper and lower two round middle straight line changeover portion practical ranges, not only can meet the requirement of track clearance and construction error, tunnel internal shield sky can also be met and push away going of passing through, and then realize the structural function similar with shield tunnel.

Content of the present utility model is not limited to cited by embodiment, the conversion of any equivalence that technical solutions of the utility model are taked by those of ordinary skill in the art by reading this utility model description, is claim of the present utility model and is contained.

Claims (3)

1. about one kind is not waited circle special cross section Tunneling by mining method structure, it is characterised in that:

The section of described tunnel structure (1) is not in waiting toroidal, including upper semi-circle and lower half circle；

By straightway transition between upper and lower semicircle, overall symmetrical, upper semi-circle radius of curvature is less than lower half circle radius of curvature.

One the most according to claim 1 does not the most wait circle special cross section Tunneling by mining method structure, it is characterised in that:

Tunnel structure (1) uses waterproof concrete cast, and outer ring has performed preliminary bracing (2), and preliminary bracing (2) outside performs steel tube shed (3) and self-feeding anchor pile (4), the internal pressure injection cement mortar of steel tube shed (3)；

Preliminary bracing (2) is made up of with spray mixed (8) grid steel frame (6), steelframe joint (7)；

Upper semi-circle grid steel frame (6) foot is provided with lock foot anchor tube (11)；

Grid steel frame (6) uses grade III steel, and steelframe joint (7) uses Q235 steel, spray mixed (8) to use C25 early strength concrete；

Form steelframe (6) is internal is provided with vertical interim type steel support (10) with level to interim type steel support (9).

One the most according to claim 1 does not the most wait circle special cross section Tunneling by mining method structure, it is characterised in that:

Being provided with shield machine guide table (5) bottom tunnel structure (1) lower half circle inner ring, shield machine guide table (5) uses fine-stone concrete cast.