CN103321659A - Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method - Google Patents
Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method Download PDFInfo
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Abstract
The invention relates to a large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and a construction method, belonging to the field of tunnel and underground engineering construction. The structure and the construction method are mainly characterized in that underground excavation subway station construction can be realized under the super-shallow burying condition without affecting ground traffic and constructed structures. The structure is structurally formed in a mode that a large-diameter flange circular steel tube curtain supports are employed on the top part, fender posts are employed on sides, the large-diameter flange circular steel tube curtain supports on the top and the fender posts on the side are organically combined together through top beams so as to form primary support, and inner hole soil bodies are excavated and secondary structures are cast based on the primary support. Compared with the conventional shallow-burying underground excavation engineering method, the structure and the construction method can remarkably reduce station burying depth, lower the engineering cost and realize underground excavated three-layer or multi-layer underground structures; in addition, the top part of a subway station constructed by using the conventional shallow-burying underground excavation engineering method is generally in an arch structure, the spatial utilization rate is low, however, the construction method breaks through the limit, stations constructed by using the method are all in rectangular cross sections, and the top part of the constructed subway station is in a horizontal plane, so that the spatial utilization rate is greatly improved.
Description
Technical field
The present invention relates to tunnel and underground engineering construction field, particularly support system adopts pipe curtain method in conjunction with the situation of hole stake method construction tunneling multiple level station during metro station construction.
Background technology
Pipe curtain jacking mainly is applicable to soft stratum, and this engineering method originates from 20 Century European, and at present, domestic Station mainly adopts the shallow burial hidden digging construction, and is mainly double-deck vault stalk structure, and for reducing construction risk, station buried depth general control is more than 7m.Station is comparatively general in the northern area of China, and engineering experience is very abundant, but three layers of tunnelings or three layers there is no complete case with bus loading zone.Particularly under super shallow embedding (earthing 3m) condition, not yet there is the precedent of tunneling subway multiple level station in the subway engineering field at home, and the top, subway station that traditional shallow buried covered excavation engineering method realizes is generally arch structure, and space availability ratio is low.
Summary of the invention
Technical problem to be solved by this invention is, the construction that performs the subway multiple level station under a kind of super shallow embedding condition is provided, and can affect traffic above-ground, pipeline and construction of structures, effectively control ground settlement, reduce construction costs, improve the tunnel structure durability.
The objective of the invention is to be achieved through the following technical solutions:
The large cross-section subway station job practices of the tunneling super shallow embedding of construction is characterized in that under the supporting of large diameter pipe curtain, comprises following construction sequence:
1) excavation and support work well;
2) processing and fabricating pipe curtain, welded flange plate on the pipe curtain is offered connecting hole at the steel pipe curtain;
3) utilize active well as operation side, by jack horizontal fragmentation jacking tube curtain to designing mileage;
4) manage in time in the jack-in process that artificial clear geotechnique does between interior, pipe;
5) adjacent pipe curtain laterally connects into integral body by connector;
6) in active well by conduit concrete perfusion in pipe curtain and between pipe;
7) get on, get off the successively lower pilot tunnel of excavation, upper pilot tunnel are finished up and down pilot tunnel supporting, by upper pilot tunnel grouting and reinforcing are carried out on the stratum of pipe curtain foot;
8) lower pilot tunnel, on perform bottom waterproofing course and bottom girder in the pilot tunnel, and reserve steel tubular column joints, after bottom girder reaches design strength, in negative one deck, perform steel pipe column be installed, lay top waterproofing course, top longeron and part top board;
9) the negative layer soil body of symmetrical piecemeal excavation, pilot tunnel in the dismounting;
10) in the negative one deck that connects, perform skirt piles and Guan Liang, and Guan Liang and lateral tube curtain are connected into integral body with the shearing resistance muscle;
11) lay negative one deck residue waterproofing course, perform negative one deck secondary structure, and pass through the bracket freely-supported on Guan Liang;
12) be excavated to plate design elevation in negative one deck downwards, lay the side wall waterproofing course, build plate in negative one deck, and finish the secondary structure sealing of negative one deck;
13) be excavated to each laminate design elevation downwards, by the step 12) mode, finish residue each layer waterproof and secondary structure and build;
14) perform the station internal construction, build and build by laying bricks or stones and fit up, finish station construction.
Active well described in the step 1) is comprised of temporary construction vertical shaft or station open-cut foundation ditch.
Described pipe curtain is round steel pipe pipe curtain, and diameter is 0.7 ~ 1.2m.
In step 9), before the pilot tunnel, set up diagonal brace in pipe curtain bight in the dismounting.
The large cross-section subway station structure of the tunneling super shallow embedding of construction is horizontal plane by the top, subway station after the abovementioned steps construction under the supporting of a kind of large diameter pipe curtain.
Beneficial effect of the present invention: the present invention program top adopts major diameter band edge of a wing steel pipe curtain, side to adopt fender post, and both are by the Guan Liang common preliminary bracing that forms that organically links together, and excavates on this basis the soil body the cavern in and builds secondary structure.Compare traditional shallow buried covered excavation engineering method, the present invention has not only absorbed the characteristics that pipe curtain method rigidity is large, settlement Control is remarkable, also drawn the flexible and changeable advantage of domestic tunneling hole stake method, this scheme can realize super shallow embedding (earthing 3m) construction F3/B3 and even multiple level station, significantly reduces construction costs; Adopt the station of engineering method construction of the present invention to be rectangular cross section, the top, station is horizontal plane, and space availability ratio improves greatly.In addition, the present invention utilizes pipe curtain and fender post as in advance supporting, finish station secondary structure construction by contrary sequence method, reduce to greatest extent the temporary works amount, can also realize entirely wrapping waterproof, solve the not enough problem of multiple level station anti-floating, the real design concept that realizes " safe and reliable, economic and practical, advanced technology ".
Description of drawings
Fig. 1 is the active well floor map.
Fig. 2 is the active well sectional schematic diagram.
Fig. 3 is the 0.9m diameter band edge of a wing, bolt hole round steel pipe pipe curtain structure schematic diagram.
Fig. 4 is skirt piles and Guan Liang and pipe curtain connection diagram.
Fig. 5-the 1st, station excavating sequences one schematic diagram.
Fig. 5-the 2nd, station excavating sequences two schematic diagrames.
Fig. 5-the 3rd, station excavating sequences three schematic diagrames.
Fig. 5-the 4th, station excavating sequences four schematic diagrames.
Fig. 5-the 5th, station excavating sequences five schematic diagrames.
Fig. 5-the 6th, station excavating sequences six schematic diagrames.
Fig. 5-the 7th, station excavating sequences seven schematic diagrames.
Fig. 5-the 8th, station excavating sequences eight schematic diagrames.
Fig. 5-the 9th, station excavating sequences nine schematic diagrames.
Fig. 5-the 10th, station excavating sequences ten schematic diagrames.
The specific embodiment
As shown in the figure, to realize three layer of three standdle carrier station of tunneling as example, the technical scheme that the invention of this engineering method is adopted comprises the steps:
1) excavation and two active wells 1 of supporting, active well 1 is comprised of temporary construction vertical shaft or station open-cut foundation ditch, and its structure is as shown in Figure 1, 2;
2) processing and fabricating steel pipe curtain 2, as shown in Figure 2, welded flange plate 11 on steel pipe curtain 2 is offered bolt hole at steel pipe curtain 2;
3) utilize active well 1 as operation side, by jack horizontal fragmentation jacking steel pipe curtain 2 to the design mileage; Steel pipe curtain 2 is apart from the about 3m in ground; Realize super shallow embedding construction operation;
4) manage in time in the jack-in process that artificial clear geotechnique does between interior, pipe;
5) at steel pipe curtain 2 interior installation cross bolts 3 and nuts 4, steel pipe curtain 2 is laterally connected into integral body;
6) in active well 1 by conduit concrete perfusion in pipe curtain 2 and between pipe;
State was shown in Fig. 5-1 after above-mentioned steps was finished;
7) after the supporting of pipe curtain reaches design strength greatly, take two ends active well 1 as work plane, by the principle that gets on, get off, excavate successively lower pilot tunnel 5, upper pilot tunnel 10, in time finish the supporting of lower pilot tunnel 5 and upper pilot tunnel 10, and carry out grouting and reinforcing by stratum, 10 pairs of pipe curtains of upper pilot tunnel foot place; Completion status is shown in Fig. 5-2;
8) lower pilot tunnel 5, on perform bottom waterproofing course and bottom girder 13 in the pilot tunnel 10, and reserve steel tubular column joints, after bottom girder 13 reaches design strength, in negative one deck, perform steel pipe column be installed, lay top waterproofing course, top longeron 14 and part top board; Completion status is shown in Fig. 5-3;
9) stride in the negative one deck of symmetrical excavation, the end bay soil body, set up diagonal brace 6 in a pipe curtain bight, and remove upper pilot tunnel 10 structures; Completion status is shown in Fig. 5-4;
10) in the negative one deck that connects, perform skirt piles 7 and hat beam 8, and will be preced with beam 8 and lateral tube curtain 2 usefulness shearing resistance muscle connect into integral body; Completion status is shown in Fig. 5-5;
11) lay negative one deck residue waterproofing course, perform negative one deck secondary structure, secondary structure comprises: top board structure, and sidewall structure etc., and pass through bracket 9 freely-supporteds on hat beam 8; Completion status is shown in Fig. 5-6;
12) be excavated to plate design elevation in negative one deck downwards, lay the side wall waterproofing course, build plate in negative one deck, and finish the secondary structure sealing of negative one deck; Completion status is shown in Fig. 5-7;
13) be excavated to negative two laminate design elevations downwards, lay the side wall waterproofing course, build plate in negative two layers, and finish negative two layers secondary structure sealing; Completion status is shown in Fig. 5-8;
14) be excavated to negative Tipple Bottom plate design elevation downwards, remove lower pilot tunnel 5, lay the side wall waterproofing course, build base plate, and finish negative three layers secondary structure sealing; Completion status is shown in Fig. 5-9;
15) perform the station internal construction, build and build by laying bricks or stones and fit up, finish station construction.Completion status is shown in Fig. 5-10.
Aforementioned steel pipe curtain 2 internal diameters close decision by comprehensive factors such as structure stress, construction operation space and structure requirements, diameter range 0.7m ~ 1.2m commonly used, steel plate or the angle steel of welding can be adopted in the edge of a wing of steel pipe curtain 2, and bolt hole should require the location to reserve according to design document in 2 production phases of steel pipe curtain.
In the pipe curtain cross bolts 3 and nut 4 are installed, diameter, length and the material of its bolt 3 and nut 4 closes decision by comprehensive factors such as structure stress and structure requirements.As long as satisfy structure stress and structure requirement, the present invention can also adopt the transverse connection of other types.
The size of upper pilot tunnel 10, lower pilot tunnel 5 and supporting parameter close decision by comprehensive factors such as structure stress, construction operation space and structure requirements, also can be with reference to common tunneling hole stake method station relevant parameter.But as long as satisfy structure stress, structure and construction operation requirements, the present invention can also adopt the other types pilot tunnel, the particular location of lower pilot tunnel 5 can be determined according to the design number of plies, lower pilot tunnel is positioned at the bottom of construction, as construct altogether as negative two layers, lower pilot tunnel is performed in negative two layers of position, construction is altogether for bearing three layers, then lower pilot tunnel is performed in negative three layers of position, the like.
Size and the supporting parameter of skirt piles 7 and hat beam 8 close decision by comprehensive factors such as structure stress, construction operation space and structure requirements, three layers and and three layers with bus loading zone in, skirt piles 7 and hat beam 8 are adopted in the suggestion of side direction space enclosing structure, after individual layer or double-deck station are examined as calculated, can adopt steel pipe curtain 2 as the side direction space enclosing structure.But as long as satisfy structure stress, structure and construction operation requirements, the present invention can also adopt other types side direction space enclosing structure.
The physical dimension of bracket 9 and arrangement of reinforcement close decision by comprehensive factors such as structure stress and structure requirements, can be cast in negative one deck side wall secondary structure.As long as satisfy structure stress and structure requirement, the present invention can also adopt the other types bracket structure.
Claims (5)
1. the large cross-section subway station job practices of the tunneling super shallow embedding of construction under the supporting of large diameter pipe curtain is characterized in that, comprises following construction sequence:
1) excavation and support work well (1);
2) processing and fabricating pipe curtain (2) at the upper welded flange plate (11) of pipe curtain (2), is offered connecting hole at steel pipe curtain (2);
3) utilize active well (1) as operation side, by jack horizontal fragmentation jacking tube curtain (2) to designing mileage;
4) manage in time in the jack-in process that artificial clear geotechnique does between interior, pipe;
5) adjacent pipe curtain (2) laterally connects into integral body by connector;
6) in active well (1) by conduit concrete perfusion in pipe curtain (2) and between pipe;
7) get on, get off the successively lower pilot tunnel (5) of excavation, upper pilot tunnel (10) are finished up and down pilot tunnel supporting, by upper pilot tunnel grouting and reinforcing are carried out on the stratum of pipe curtain foot;
8) in lower pilot tunnel (5), upper pilot tunnel (10), perform bottom waterproofing course and bottom girder (13), and reservation steel tubular column joints, after bottom girder (13) reaches design strength, in negative one deck, perform steel pipe column is installed, lay top waterproofing course, top longeron (14) and part top board;
9) the negative layer soil body of symmetrical piecemeal excavation, pilot tunnel in the dismounting (10);
10) in the negative one deck that connects, perform skirt piles (7) and Guan Liang (8), and Guan Liang (8) and lateral tube curtain (2) are connected into integral body with shearing resistance muscle (12);
11) lay negative one deck residue waterproofing course, perform negative one deck secondary structure, and pass through bracket (9) freely-supported on Guan Liang (8);
12) be excavated to plate design elevation in negative one deck downwards, lay the side wall waterproofing course, build plate in negative one deck, and finish the secondary structure sealing of negative one deck;
13) be excavated to each laminate design elevation downwards, by the step 12) mode, finish residue each layer waterproof and secondary structure and build;
14) perform the station internal construction, build and build by laying bricks or stones and fit up, finish station construction.
2. the large cross-section subway station job practices of the tunneling super shallow embedding of construction under the large diameter pipe curtain according to claim 1 supporting is characterized in that, the active well described in the step 1) (1) is comprised of temporary construction vertical shaft or station open-cut foundation ditch.
3. the large cross-section subway station job practices of the tunneling super shallow embedding of construction under the large diameter pipe curtain according to claim 1 supporting is characterized in that, described pipe curtain (2) is round steel pipe pipe curtain, and diameter is 0.7 ~ 1.2m.
4. according to claim 1, the large cross-section subway station job practices of the tunneling super shallow embedding of construction is characterized in that under the supporting of described large diameter pipe curtain, in step 9), before the pilot tunnel, sets up diagonal brace (6) in pipe curtain bight in the dismounting.
5. the large cross-section subway station structure of the tunneling super shallow embedding of construction under the large diameter pipe curtain supporting is characterized in that, is horizontal plane by the top, subway station after the aforementioned claim step construction.
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