CN105003272B - Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways - Google Patents

Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways Download PDF

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Publication number
CN105003272B
CN105003272B CN201510442470.8A CN201510442470A CN105003272B CN 105003272 B CN105003272 B CN 105003272B CN 201510442470 A CN201510442470 A CN 201510442470A CN 105003272 B CN105003272 B CN 105003272B
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station
column
construction
jurisdiction
tunnel
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CN105003272A (en
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张明聚
刘义
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention discloses a reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways. The expanded and excavated stations are simply supported frame wall column type double-layer subway stations in structural forms. The reversed construction method includes retaining soil and water by the aid of piles in rows and waterproof curtains or underground diaphragm walls, and resisting lateral deformation of soil mass; excavating the soil mass between openings of parallel shield tunnel segments and constructing cross passages; grouting and reinforcing the soil mass above tunnels, building foundation pit excavation supporting structures and short supporting piles of station bodies and connecting the tops of the foundation pit excavation supporting structures and the short supporting piles with the outer piles in the rows or the outer underground diaphragm walls by connecting beams; constructing the structures of the station bodies by the aid of cover and excavation top down processes, filling the station bodies with the soil mass and recovering road surfaces. Foundation pit slopes can be supported by the aid of composite soil nailing supporting technologies in excavation procedures. The reversed construction method has the advantages that the reversed construction method is reasonable and feasible, is high in operability and has important engineering application value and an important development prospect, and huge economic, social and environmental benefits can be brought by application of the reversed construction method.

Description

A kind of reversed construction method that station is digged on the basis of Subway Tunnel shield tunnel
Technical field
The present invention relates to a kind of structure that station is digged on the basis of Subway Tunnel shield tunnel and its it is inverse do construction method, Belong to track traffic technical field of construction.
Background technology
In the middle of numerous subway construction constructions, " shield method " is very fast, right with its working security height, speed of application The features such as surrounding environment influence is relatively small has obtained increasingly being widely applied in subway construction.However, conventional at home Interval shield construction in the middle of, the simple single running tunnel construction of form of fracture is only limitted to the use of shield, running into Shield miss the stop problem when, often first shield disassembled, hang out from current shield well, then proceed to another shield well, Shield is re-assemblied again, is constructed;Or in advance dig station, the width at station and bottom are enlarged, so Afterwards shield is drawn using dilatory equipment and missed the stop.No matter two kinds of modes of missing the stop can all cause Suporting structure from for which angle Utilization ratio is substantially reduced, and the disposable continuous driving distance for making shield method is greatly shortened.According to Beijing at present on several ground built Shield construction present situation statistics on iron wire road, the shield machine of a practice of construction removes the time of its work holdup in interval, and it is applied The work non-propulsion activity duration accounts for the 52.7% of total construction propulsion activity duration, and these non-propulsion constructions mainly exist including shield machine The construction of shield well when missing the stop, the assembling of going into the well of shield machine, disintegrate, hang out, transition, turn around, it is dilatory miss the stop, if again plus Work holdup situation of the upper shield machine in interval construction, the practice of construction speed of shield machine can be slower, and its utilization rate will be lower.This Outward, because present shield construction causes shield machine in construction period very flexible, its dismounting group repeatedly unloads dilatory missing the stop Etc. the service life of shield machine for substantially reducing.Meanwhile, launching shaft, received well, the construction of the well that turns around and shield machine Disintegrate, hang out, the extra operating expenses caused by transition etc., make the engineering cost cost in shield construction per km compared with shield The expense that machine is normally advanced is increased up to nearly 10% or so;And for the dilatory of shield machine misses the stop, be related to intensification and widen station The extra charge brought, about 6%~8% is increased per km.It can be seen that, the non-propulsion how effectively reduced in shield construction is made Industry construction is the key point of the utilization ratio problem for improving shield machine.
The content of the invention
Based on the problems referred to above, the present invention proposes a kind of structure that station is digged on the basis of Shield-bored tunnels and its construction Method, its version is freely-supported framed wall pillar bilayer Metro Station Structure system.It adopts double building enclosures to carry out gear soil Dash;Section of jurisdiction supporting is carried out using section of jurisdiction inner support system, unnecessary section of jurisdiction is removed, and using rectangular steel plates and " L " shape Cast iron arch springing beam carries out longitudinal restraint to section of jurisdiction;In the transverse passage-way excavated out using subsurface excavation method, the base plate of agent structure is constructed With central post strip footing and both walls intercolumniation cross-brace beam, and carry out between base plate and wall column, cross-brace beam and wall column Connection;Excavation construction is carried out to station agent structure using sheltered reverse excavation, when excavating bottom station space, is removed remaining many Remaining section of jurisdiction, and carry out the connection of coupling beam between section of jurisdiction and wall column;By the use of wall column system, side wall, central post constructed etc. as master The vertical supporting system of body structure, by the use of the base plate constructed, middle plate, top board and cross-brace beam as the horizontal of agent structure Support system.Its main purpose is that offer is a kind of builds subway station in the underground railway engineering using shield construction New technology, new method, to reduce the non-propulsion operation in the middle of shield-tunneling construction, improves the utilization ratio of Suporting structure.It is mainly used in Under solving prevailing conditions, interval shield (is referred to for a diameter of 6m of Suporting structure of subway sectional tunnel or so, it is impossible to opened using it The single shield tunnel enlarging subway station that digging is formed) in the middle of tunnel enlarging metro station construction non-propulsion operation it is excessive, shield The low problem of structure equipment service efficiency.
To achieve these goals, the technical solution used in the present invention is:
Step one:Construct in the range of subway station building enclosure A (as campshed plus water-stop curtain or underground are continuous planning to build Wall), building enclosure A top pours Guan Liang and in Guan Liang near the reserved sufficient length reinforcing bar in main body station side, its Guan Liang top Absolute altitude should be equal with ground elevation.The building-in depth of building enclosure should meet the requirement of resistance to overturning and Antiseepage stability;
Step 2:Subway sectional tunnel is applied using Suporting structure, the interim inner support system in section of jurisdiction is set up inside section of jurisdiction, The version of inner support system is gate type support structure, for the sake of construction and safety, each interim inner support system width Degree is a width of preferably with half section of jurisdiction, each endless tube piece construction period, it is ensured that at least support of the semi-ring section of jurisdiction in inner support system Under, and with the connection of longitudinal bracing rod member between adjacent interim inner support system;
Step 3:Designed openings position section of jurisdiction is removed, using the reserved steel of section of jurisdiction at rectangular steel plates and lower cut Muscle and built-in fitting are attached, and are carried out with the reserved steel bar and built-in fitting of section of jurisdiction at " L " shaped cast iron arch springing girder construction and upper cut Connection, longitudinal restraint is carried out to section of jurisdiction at upper cut, and water-proof concrete is poured between cast iron arch springing beam and section of jurisdiction to carry out Waterproof;
Step 4:Light section transverse passage-way excavation is carried out the soil body between parallel shield tunnel corresponding opening, soil excavation is treated After finishing, uplift pile, station base arrangement and wall column structure are poured in transverse passage-way, apply wall column and the upper and lower otch in opening section of jurisdiction Place's node, pours support beam between wall column, applies wall column and support beam node, and between correspondence wall column temporary steel is set up Support.Together with station base plate is poured with wall column bottom and while pour station agent structure neutrality column foundation, neutral column foundation two Side is closely connected and reserved central post bottom cup-shaped recess and node connector with base plate;
Step 5:Grouting and reinforcing is carried out to transverse passage-way and section of jurisdiction top soil layer, in the range of excavation of foundation pit is drafted base is constructed Hole excavating structure B and short fender post, and be attached building enclosure B, short fender post and building enclosure 1 with coupling beam;
Step 6:Soil mass of foundation pit in the range of station is carried out to be excavated to top board bottom design elevation location, body junction is constructed Structure top board, and set central post.After top body plate concrete reaches design strength, the top board top soil body is backfilled and extensive Multiple road surface.Using gateway or air channel position, it is close to station structure and vertical shaft is set, broken pile opens ingate and station station hall layer is carried out Excavate.In digging process, in order to keep the stability of fender post, supporting is carried out to it simultaneously in time using compound soil nail support technology Carry out middle plate and the construction of station hall layer side wall;
Step 7:The station layer residue soil body is excavated, remainder section of jurisdiction is removed, " L " shape is installed at upper cut Cast iron arch springing beam is simultaneously welded with arch springing beam set by wall column position, and rectangle steel at rectangular steel plates, with wall column is installed at lower cut Plate weld, completes pouring for whole base arrangement, at the upper and lower opening of section of jurisdiction, constructs coupling beam structure between wall column, applies open tube Lower cut node constructs and pours water-proof concrete with waterproof on the outside of upper node on piece;
Step 8:The interim inner support system in section of jurisdiction is removed, inverted arch structure of constructing in shield tunnel;
Step 9:Temporary steel support between wall column is removed, station bottom side wall, platform slab is constructed, is carried out and superstructure Connection, completes main structure construction;
Beneficial effect
A kind of structure that subway station is digged on the basis of Subway Tunnel shield tunnel proposed by the invention and its inverse do Construction method, the non-propulsion operation being effectively reduced in shield-tunneling construction, substantially increases the efficiency of construction of shield-tunneling construction, both for The long distance driving of shield machine provides condition, and the also flexible selection for interchange of position provides possibility.Meanwhile, gone along with sb. to guard him using double Structure, both ensure that the resistance to overturning of main structure body, also been removed the potential safety hazard hidden in work progress.Rectangular steel plates The application of " L " shaped cast iron arch springing beam not only serves the effect of longitudinal restraint to the section of jurisdiction at opening, also causes section of jurisdiction and wall The connecting node stress of coupling beam is more reasonable between post and section of jurisdiction and wall column, and water-proofing treatment is simpler easy.The construction of transverse passage-way The construction that takes the lead in for base plate creates condition, and used as one of the cross-brace of wall column, the construction of base plate strengthens stablizing for wall column Property.Station main body using sheltered reverse excavation construct, take up an area less, it is little to surrounding environment influence, economical, safe, horizontal stroke has been added between wall To support beam, can more preferably ensure wall column structure and stratum lateral stability between node.The technology of the present invention is reasonable, construction reliability Easy, stress system conversion is simple, and clearly quality is easily controllable, will thoroughly change the conventional program that underground railway is built, and it is applied Work application will bring huge economic benefit, social benefit and environmental benefit.
Description of the drawings
Fig. 1 is the subway station standard section profile digged on the basis of Parallel Interval shield tunnel of the present invention, Fig. 2 For freely-supported framed wall pillar bilayer subway station three-dimensional structure diagram.
Fig. 3~Figure 14 is each construction way figure that Parallel Interval shield tunnel of the present invention digs subway station.Wherein, Fig. 3 For bored pile (wall), building enclosure 1 and Guan Liang are constructed;Fig. 4 is that shield-tunneling construction is interval by station, and running tunnel AT STATION Interior placement shield duct piece;Fig. 5 is the installation inner support system in duct pieces of shield tunnel;Fig. 6 installs square to remove unnecessary section of jurisdiction Shape steel plate and " L " shaped cast iron arch springing beam, and pour water-proof concrete and carry out waterproof;Fig. 7 is to install in section of jurisdiction to prop up inside section of jurisdiction Support, laterally excavates transverse passage-way and pours uplift pile at correspondence section of jurisdiction opening;Fig. 8 is construction wall column and base plate, neutral column foundation, And temporary steel support is set up between wall column, and the upper lower node between wall column and section of jurisdiction is applied, pour the cross-brace of both walls intercolumniation Beam;Fig. 9 is grouting and reinforcing section of jurisdiction and transverse passage-way upper soil horizon and constructs building enclosure 2 and short fender post, at the Guan Liang of top pair Building enclosure 1 and building enclosure 2, short fender post carry out coupling beam connection;Figure 10 is that soil mass of foundation pit in the range of station is excavated, Agent structure top board is constructed, and sets central post, to the top board top soil body road surface is backfilled and recovered;Figure 11 is excavation subway concourse Layer soil body, supporting and middle plate and station hall layer side wall are poured when excavating;Figure 12 is excavation platform layer soil body until designed elevation position Put, remove remaining unnecessary section of jurisdiction, longitudinal restraint is carried out to incision section of jurisdiction, and constructs coupling beam between wall column to carry out with incision section of jurisdiction Connection;Figure 13 pours inverted arch structure to remove section of jurisdiction inner support system inside section of jurisdiction;Figure 14 is propped up to remove temporary steel between wall column Support, constructs bottom side wall, platform slab.
Figure 15 is transverse passage-way standard section profile.
In figure, 1, road surface, 2, building enclosure A, 3, Guan Liang, 4, shield duct piece, 5, wall column, 6, rectangular steel plates, 7, " L " shaped cast Iron arch springing beam, 8, water-proof concrete, 9, inverted arch, 10, base plate, 11, neutral column foundation, 12, grouting and reinforcing soil layer, 13, go along with sb. to guard him knot Structure B, 14, coupling beam, 15, anchor pole, 16, bottom central post, 17, cross-brace beam, 18, bottom side wall, 19, middle plate, 20, station hall layer Side wall, 21, central post, 22, top board, 23, backfill, 24, uplift pile, 25, Guan Liang, 26, interim inner support, 27, transverse passage-way, 28th, temporary steel support, 29, platform slab, coupling beam between 30, wall column, 31, soil nailing, 32, short fender post.
Specific embodiment
As shown in figures 1-15, across the subway station embodiment of shallow embedding bilayer two under a urban road of the invention, adopts A kind of the inverse of subway station that dig on the basis of Subway Tunnel shield tunnel of the present invention does construction and applies, its agent structure By cast-in-situ steel reinforced concrete base plate 10, middle plate 19, top board 22, bottom side wall 18, station hall layer side wall 20, wall column 5, shield tunnel Piece 4, cross-brace beam 17, central post 21 constitute (its structure composition is as shown in Figure 1), its structure top thickness of earth covering 5.5m, excavate Cross dimensions is 12m × 20.5m.With reference to accompanying drawing, the construction way of the present invention is further described in detail.
Inverse construction its construction way of doing that station is digged on the basis of Subway Tunnel shield tunnel of the present embodiment is:
Step one:Stake is filled punching in the range of subway station is planned to build, building enclosure A2 is constructed, is poured at the top of building enclosure A2 Build Guan Liang 3 and in Guan Liang near the reserved sufficient length reinforcing bar in station side;
Step 2:Subway sectional tunnel is applied using Suporting structure, duct pieces of shield tunnel is installed AT STATION in running tunnel 4, and the interim inner support 26 in section of jurisdiction is set up inside section of jurisdiction;
Step 3:Design opening portion section of jurisdiction, using the reserved steel bar of section of jurisdiction at rectangular steel plates 6 and lower cut and pre- Embedded part is attached, and is attached with the reserved steel bar and built-in fitting of section of jurisdiction at " L " shaped cast iron arch springing beam 7 and upper cut, with right Section of jurisdiction carries out longitudinal restraint at upper cut, and water-proof concrete 8 is poured between cast iron arch springing beam and section of jurisdiction carries out waterproof;
Step 4:Light section transverse passage-way 27 is carried out the soil body between parallel shield tunnel corresponding opening to excavate,
Step 5:After soil excavation is finished, uplift pile, station base plate 10 and wall column 5 are constructed in transverse passage-way 27, applied Wall column 5 and shield duct piece incision node about 4, pours support beam 17 between wall column, applies wall column 5 and the node of crossbeam 17, Temporary steel support 28 is set up between wall column.Together with station base plate 10 is poured with the bottom of wall column 5 and while pour station body junction Structure neutrality column foundation 11, the both sides of neutral column foundation 11 are closely connected with base plate 10 and reserved central post bottom cup-shaped recess and node connect Fitting;
Step 6:Grouting and reinforcing is carried out to transverse passage-way and section of jurisdiction top soil layer, in the range of excavation of foundation pit is drafted base is constructed Hole excavating structure B13, short fender post 32, and entered building enclosure B13, short fender post 32 with building enclosure A2 with coupling beam 14 Row connection;
Step 6:Soil mass of foundation pit in the range of station is carried out to be excavated to the bottom design elevation location of top board 22, main body is constructed Structure roof 22, and set central post 21.After top body plate concrete reaches design strength, the top board top soil body is carried out back Banket and 23 and recover road surface 1.Using gateway or air channel position, it is close to station structure and vertical shaft is set, broken pile drives ingate to car Station hall layer of standing is excavated.In digging process, in order to keep the stability of fender post, it is entered using compound soil nail support technology Row supporting simultaneously carries out in time middle plate 19 and station hall layer side wall 20 is constructed;
Step 7:The station layer residue soil body is excavated, remainder section of jurisdiction is removed, " L " shaped cast iron arch is installed at upper cut Pin beam 7 is simultaneously welded with arch springing beam set by wall column position, rectangular steel plates 6 at rectangular steel plates 6, with wall column is installed at lower cut and is welded Connect, complete pouring for whole base arrangement, at the upper and lower opening of section of jurisdiction, construct coupling beam 30 between wall column, apply opening section of jurisdiction upper and lower Otch node is constructed and water-proof concrete 8 is poured on the outside of upper node with waterproof;
Step 8:The interim inner support 26 in section of jurisdiction is removed, the structure of inverted arch 9 of constructing in shield tunnel;
Step 9:Temporary steel support 28 between wall column is removed, station bottom side wall 18, platform slab 29 is constructed;
Step 10:The construction of this job step is completed, next step construction is carried out.
Building enclosure A2 adds water-stop curtain or continuous underground wall structure for campshed, and hat is poured at the top of building enclosure A2 Beam 3, the elevation of top of Guan Liang 3 is equal with the absolute altitude of ground 1.Building enclosure A2 building-in depth should meet resistance to overturning and Antiseepage stability Property require;
The external diameter of shield duct piece 4 is 6m or so, it is impossible to extend subway station using single shield tunnel.
Shield duct piece 4 is installed, the shield duct piece 4 installed is straight joint splicing, and strengthens in the running tunnel AT STATION Ring connection between section of jurisdiction.
The interim inner support 26 in section of jurisdiction is set up inside shield duct piece 4, the interim inner support 26 for being set up is for convenience of construction Gate type support structural system.For the sake of construction and safety, each width of interim inner support 26 is a width of preferably with half section of jurisdiction, often One endless tube piece construction period, it is ensured that at least semi-ring section of jurisdiction is under the support of inner support, and adjacent interim inner support system Between with longitudinal bracing rod member connection.
The rectangular steel plates 6, its longitudinal stretching rigidity is sufficiently large, to constrain section of jurisdiction demolishing process in occur longitudinal direction from Dissipate;" L " shaped cast iron arch springing beam 7 should have enough bending stiffnesses in addition to longitudinal stretching rigidity is met, also, to meet connection stiffness Demand.
The light section transverse passage-way 27, it is bordered by position with section of jurisdiction should be arranged between wall column construction working, workplace top mark Height should be higher than that wall column 20~30cm of elevation of top, and transverse passage-way elevation of bottom should be no less than wall column elevation of bottom, and its excavation width is big In or equal to the width of a wall column.
The uplift pile 24 constructed in the transverse passage-way 27, its foundation stabilization intensity should meet base bearing capacity examination criteria.
Building enclosure B13 is underground continuous wall-enclosure structure.
Described to carry out grouting and reinforcing to transverse passage-way 27 and the top soil layer of shield duct piece 4, its reinforcing scope regards concrete soil body bar Depending on part, concrete norm is not done.Coupling beam 14 between the building enclosure, its elevation of top is not higher than ground elevation.
Little fender post 32 is used to go along with sb. to guard him excavation slope during more than 22 excavation of foundation pit of top board, and its building-in depth meets side slope Stability requirement.
The building enclosure B13 bottom is connected with the water-proof concrete 8 poured in " L " shaped cast iron arch springing beam 7, and should take Measure avoids the node to constructing from causing compared with large disturbances.
The central post 21 is concrete filled steel tube central post.
" L " the shaped cast iron arch springing beam 7 should be fastenedly connected with rectangular steel plates 6 with section of jurisdiction reserved steel bar and built-in fitting;It is described The height of inverted arch 9 for pouring meets gauge requirement and the design height setting of wall column 5 when normally running by train.
Described its version of main body station is freely-supported framed wall pillar bilayer Metro Station Structure system.
Be more than the present invention an exemplary embodiments, the present invention enforcement not limited to this.

Claims (10)

1. a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, it is characterised in that:Specific construction Step is,
Step one:Construct in the range of subway station building enclosure A (2) planning to build, building enclosure A (2) top pour Guan Liang (3) and In Guan Liang (3) near the reserved sufficient length reinforcing bar in main body station side;
Step 2:Subway sectional tunnel is applied using Suporting structure, installation shield duct piece (4) in running tunnel AT STATION, and Section of jurisdiction inside sets up the interim inner support (26) in section of jurisdiction;
Step 3:Design opening portion section of jurisdiction, using the reserved steel bar of section of jurisdiction at rectangular steel plates (6) and lower cut and pre-buried Part is attached, and is attached with the reserved steel bar and built-in fitting of section of jurisdiction at " L " shaped cast iron arch springing beam (7) and upper cut, with right Section of jurisdiction carries out longitudinal restraint at upper cut, and pours building waterproofing coagulation between " L " shaped cast iron arch springing beam (7) and shield duct piece (4) Native (8) carry out waterproof;
Step 4:Light section transverse passage-way (27) excavation is carried out the soil body between parallel shield tunnel corresponding opening, soil excavation is treated After finishing, uplift pile, station base arrangement (10) and wall column (5) are poured in light section transverse passage-way, apply wall column and open tube The upper and lower incision node of piece, pours support beam between wall column (17), applies wall column and support beam node, sets up between wall column Temporary steel support (28);Together with station base arrangement (10) is poured with wall column (5) bottom and while pour station agent structure Neutral column foundation (11), neutral column foundation (11) both sides are closely connected and reserved central post bottom cup with station base arrangement (10) Shape mouth and node connector;
Step 5:Grouting and reinforcing is carried out to light section transverse passage-way (27) and shield duct piece (4) top soil layer, is drafted in excavation of foundation pit In the range of construct excavation of foundation pit building enclosure B (13) and short fender post (32), and with coupling beam (14) by building enclosure B (13), short Fender post (32) is attached with building enclosure A (2);
Step 6:Soil mass of foundation pit in the range of station is carried out to be excavated to top board (22) bottom design elevation location, body junction is constructed Structure top board (22), and set central post (21);After top body plate concrete reaches design strength, backfill is filled out to top board top (23) backfilled and recovered road surface (1);Using gateway or air channel position, it is close to station structure and vertical shaft is set, broken pile opens horse Head door is excavated to station station hall layer;In digging process, in order to keep the stability of fender post, using composite soil nailing skill Art carries out supporting to it and carries out middle plate (19) and station hall layer side wall (20) construction in time;
Step 7:The station layer residue soil body is excavated, remainder section of jurisdiction is removed, " L " shaped cast iron is installed at upper cut Arch springing beam (7) is simultaneously welded with cast iron arch springing beam set by wall column position, and rectangle at rectangular steel plates, with wall column is installed at lower cut Steel plate (6) is welded, and completes pouring for whole base arrangement, at the upper and lower opening of section of jurisdiction, constructs coupling beam between wall column (30), is applied out Lower cut node pours and pours water-proof concrete with waterproof on the outside of upper node on mouth section of jurisdiction;
Step 8:The interim inner support (26) in section of jurisdiction is removed, inverted arch (9) structure of constructing in shield tunnel;
Step 9:Temporary steel support (28) between wall column is removed, station bottom side wall (18) and platform slab (29) is constructed, bottom is carried out Structure and the connection of superstructure, complete main structure construction.
2. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step one, building enclosure A (2) adds water-stop curtain for campshed, or for continuous underground wall structure, Guan Liang (3) is poured at building enclosure A (2) top, Guan Liang (3) elevation of top is equal with road surface (1) absolute altitude.
3. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 2, the shield duct piece (4) installed is straight joint splicing, and strengthens the connection of the ring between section of jurisdiction; The interim inner support (26) in section of jurisdiction is set up inside shield duct piece (4), the interim inner support (26) for being set up is gate type support structure System.
4. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 3, the rectangular steel plates (6), its longitudinal stretching rigidity is sufficiently large, was removed with constraining section of jurisdiction There is longitudinal dispersion in journey;" L " shaped cast iron arch springing beam (7) should have enough bendings firm in addition to longitudinal stretching rigidity is met, also Degree, to meet connection stiffness demand.
5. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 4, the light section transverse passage-way (27), it is bordered by position and should arrange wall column construction working with section of jurisdiction Between, workplace elevation of top should be higher than that wall column 20~30cm of elevation of top, and light section transverse passage-way elevation of bottom should be no less than wall column Elevation of bottom, width of its excavation width more than or equal to a wall column;The resistance to plucking constructed in the light section transverse passage-way (27) Stake (24), its foundation stabilization intensity should meet base bearing capacity examination criteria.
6. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 5, building enclosure B (13) is underground continuous wall-enclosure structure;Little fender post (32) is used for Excavation slope is gone along with sb. to guard him during top board (22) above excavation of foundation pit, its building-in depth meets slope stability requirement;It is described to go along with sb. to guard him The water-proof concrete (8) poured in structure B (13) bottom and " L " shaped cast iron arch springing beam (7) is connected, and should take measures to avoid it is right The node constructed is caused compared with large disturbances.
7. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 6, the central post (21) is concrete filled steel tube central post.
8. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 7, " L " shaped cast iron arch springing beam (7) and rectangular steel plates (6) should be with section of jurisdiction reserved steel bars and pre- Embedded part is fastenedly connected.
9. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 8, the inverted arch (9) for pouring meets gauge requirement and wall column when highly normally running by train (5) design height setting.
10. according to claim 1 a kind of the inverse of station that dig on the basis of Subway Tunnel shield tunnel does construction method, its It is characterised by:In the step 9, described its version of main body station is freely-supported framed wall pillar bilayer Metro Station Structure System.
CN201510442470.8A 2015-07-26 2015-07-26 Reversed construction method for expanding and excavating stations on sectional shield tunnel foundations of subways Expired - Fee Related CN105003272B (en)

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