CN103527204B - A kind of method for tunnel construction of first wall rear arch intersection median septum - Google Patents
A kind of method for tunnel construction of first wall rear arch intersection median septum Download PDFInfo
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- CN103527204B CN103527204B CN201310544705.5A CN201310544705A CN103527204B CN 103527204 B CN103527204 B CN 103527204B CN 201310544705 A CN201310544705 A CN 201310544705A CN 103527204 B CN103527204 B CN 103527204B
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Abstract
The invention discloses a kind of method for tunnel construction of first wall rear arch intersection median septum; the present invention first constructs the pilot tunnel at arch springing position; to construct in pilot tunnel more vertical skirt piles of constructing below vertical longeron and pilot tunnel, then under advance support protection, adopt CRD engineering method partial excavation tunnel.The present invention is applicable to features as poor geologic condition, buried depth is shallow, width is large and require strict tunnel to construction settlement, arch load can be passed in time on the high longeron of supporting capacity and skirt piles, effective minimizing Settlement in Construction Period, working security is high, and preliminary bracing structural integrity is good, waterproofing course can continuous laying, monobloc cast secondary lining, and good water-proof effect, quality is secure.
Description
Technical field
The present invention relates to technical field of tunnel construction, refer to a kind of method for tunnel construction of first wall rear arch intersection median septum particularly.
Background technology
Under complex environment, shallow embedding condition, longspan tunnel excavation method is more, and wherein main construction method is for intersecting median septum method (CRD, Center Cross Diaphragm) or stake camber method (PBA, Pile-Beam-Arc).
As shown in Figure 1, CRD engineering method is by the tunnel median septum 1.1 compared with big cross section, horizontal support 1.2, be divided into some small cavities, partial excavation small cavities and each self-enclosed one-tenth ring are until whole section excavation completes, then remove median septum and horizontal support, build secondary lining, complete the method for constructing tunnel.Big cross section is divided into light section construction by the method, finally complete the construction of large cross-section tunnel, excavated section can be avoided to amass, and disturbance that much thus formation produces is excessive, be conducive to tunnel structure to stablize, but because preliminary bracing arch springing and foundation are all directly located on stratum, under powerful stratum vertical uniform load q, easily cause structural entity to sink and left and right uneven subsidence, be not only difficult to when deflection is excessive control surface settlement, structure also may be made to produce and destroy.In addition, the quality of connection of the median septum of this engineering method, horizontal support and preliminary bracing is difficult to ensure, the risk that may occur connecting portion local buckling and then cause total to be destroyed.
As shown in Figure 2; PBA engineering method; utilize the little pilot tunnel 2.1 of first constructing; vertical construction skirt piles 2.2, center pillar 2.3 and the longeron 2.4 be arranged in little pilot tunnel 2.1; then step excavation arch, build arch structure between two side girders; under the protection of arch structure, skirt piles, tunneling remainder, then placement layer by layer internal construction is until complete whole tunnel structure.
This engineering method is mainly used in metro station construction, and it has used for reference the advantage of cover and cut construction method conventional in underground construction, completes the construction of main hole, but there is following problem in actual use under the top structure of formerly constructing protection:
1. working procedure is many, and switching node is many: the main node of structure is all apply in small space, and construction quality is difficult to ensure;
2. the longeron 2.4 above center pillar 2.3 passes through the arch anatomical connectivity of segmentation with the longeron 2.4 above skirt piles 2.2, and in node location place waterproof construction difficulty, this position leaks comparatively serious, and construction quality is difficult to ensure;
3. internal construction constuction joint is many, and globality is poor, and waterproof effect is poor.
Therefore, need improve prior art.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve above-mentioned background technology, provides the method for tunnel construction that a kind of first wall rear arch intersects median septum, to solve Problems existing in background technology.
Technical scheme of the present invention is: a kind of method for tunnel construction of first wall rear arch intersection median septum, and it is characterized in that, it comprises the following steps:
1), to construct left pilot tunnel and right pilot tunnel;
2), in the bottom of left pilot tunnel to construct downwards left side stake, the right stake of constructing downwards in the bottom of right pilot tunnel;
3), on a left side lead the left longeron of in-cavity construction, lead in-cavity construction right vertical beam on the right side;
4), on the right side of left pilot tunnel the first branch is excavated, and the first arch preliminary bracing of first branch that constructs, septum primum wall and the first horizontal support, the first horizontal support is arranged between left pilot tunnel and septum primum wall;
5), on the left of right pilot tunnel, the second branch is excavated, and the second arch preliminary bracing of second branch that constructs and the second horizontal support, second arch preliminary bracing and the first arch preliminary bracing form the preliminary bracing of arch, tunnel, and the second horizontal support is arranged between right pilot tunnel and septum primum wall;
6), on the right side of the stake of the left side, below the first horizontal support, the 3rd branch is excavated, and the septum secundum wall of the 3rd branch that constructs and the 3rd horizontal support, septum secundum wall upper end is connected with septum primum wall lower end, and the 3rd horizontal support is arranged between left side stake and septum secundum wall;
7), on the left of the stake of the right, below the second horizontal support the 4th branch is excavated, and the 4th horizontal support of the 4th branch that constructs, the 4th horizontal support is arranged between the right stake and septum secundum wall;
8), according to step 6,7 excavate downwards, until tunnel has all excavated;
9), after tunnel excavation completes, the structure that horizontal support in mid-board, tunnel and left pilot tunnel and right pilot tunnel invade tunnel scope is removed in segmentation;
10), lay splash guard, build secondary lining, complete tunnel structure construction.
In such scheme:
The stake of the described left side and the right stake adopt hand excavated pile or bored pile to construct.
Described left longeron and right vertical beam are reserved with the built-in fitting be connected with the second horizontal support with arch preliminary bracing, the first horizontal support.
Described 3rd horizontal support is fixedly connected with left side stake, and described 4th horizontal support is fixedly connected with left side stake.
The present invention is applicable to features as poor geologic condition, buried depth is shallow, width is large and require strict tunnel to construction settlement, arch load can be passed in time on the high longeron of supporting capacity and skirt piles, effective minimizing Settlement in Construction Period, working security is high, and preliminary bracing structural integrity is good, waterproofing course can continuous laying, monobloc cast secondary lining, and good water-proof effect, quality is secure.
Accompanying drawing explanation
Fig. 1 is CRD engineering method schematic diagram;
Fig. 2 is PBA engineering method schematic diagram;
Fig. 3 is the left pilot tunnel of construction and right pilot tunnel schematic diagram;
Fig. 4 is construction left side stake and the right stake schematic diagram;
Fig. 5 is the left longeron of construction and right vertical beam schematic diagram;
Fig. 6 is construction first branch schematic diagram;
Fig. 7 is construction second branch schematic diagram;
Fig. 8 is construction the 3rd branch's schematic diagram;
Fig. 9 is construction the 4th branch's schematic diagram;
Figure 10 is constructing tunnel schematic diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
CRD engineering method as shown in Figure 1, the PBA engineering method shown in Fig. 2, be explained in detail in the introduction, repeat no more in this.
The method for tunnel construction of illustrated a kind of first wall rear arch intersection median septum, it comprises the following steps:
1), utilize surrounding enviroment condition, construct left pilot tunnel 1 and right pilot tunnel 2(as shown in Figure 3), it is little that the headroom size of left pilot tunnel 1 and right pilot tunnel 2 should be tried one's best under the construction requirement meeting left side stake 3, the right stake 4 and left longeron 5, right vertical beam 6;
2), in the bottom of left pilot tunnel 1 to construct downwards left side stake 3, construct the right stake 4(downwards in the bottom of right pilot tunnel 2 as shown in Figure 4), adopt hand excavated pile or bored pile to construct according to geological conditions left side stake 3 and the right stake 4;
3), left longeron 5 of constructing in left pilot tunnel 1, right pilot tunnel 2 in, construction right vertical beam 6(is as shown in Figure 5), left longeron 5 and right vertical beam 6 are reserved with the built-in fitting be connected with arch preliminary bracing, the first horizontal support 10, second horizontal support 13;
4), on the right side of left pilot tunnel 1, the first branch 7 is excavated, and the first arch preliminary bracing 8 of first branch 7 that constructs, septum primum wall 9 and the first horizontal support 10, first horizontal support 10 is arranged between left pilot tunnel 1 and septum primum wall 9 (as shown in Figure 6), and the first arch preliminary bracing 8, first horizontal support 10 is connected firmly with the built-in fitting in left longeron 5;
5), on the left of right pilot tunnel 2, the second branch 11 is excavated, and the second arch preliminary bracing 12 of second branch 11 that constructs and the second horizontal support 13(are as shown in Figure 7), second arch preliminary bracing 12 and the first arch preliminary bracing 8 form the preliminary bracing of arch, tunnel, and the preliminary bracing of arch, tunnel can require to arrange shaped steel arch or grillage according to structure stress; Second horizontal support 13 is arranged between right pilot tunnel 2 and septum primum wall 9, and the second arch preliminary bracing 12 is connected firmly with the built-in fitting in right vertical beam 6;
6), on the right side of left side stake 3, below the first horizontal support 10, the 3rd branch 14 is excavated, and the septum secundum wall 15 of the 3rd branch 14 that constructs and the 3rd horizontal support 16, septum secundum wall 15 upper end is connected with septum primum wall 9 lower end, 3rd horizontal support 16 is arranged on (as shown in Figure 8) between left side stake 3 and septum secundum wall 15, and the 3rd horizontal support 16 is connected firmly with left side stake 3;
7), on the left of the right stake 4, below the second horizontal support 13, the 4th branch 17 is excavated, and the 4th horizontal support 18 of the 4th branch 17 that constructs, 4th horizontal support 18 is arranged between the right stake 4 and septum secundum wall 15 (as shown in Figure 9), and the 4th horizontal support 18 is connected firmly with left side stake 4.
8), according to step 6,7 excavate downwards, until tunnel has all excavated;
9), after tunnel excavation completes, the structure that horizontal support in mid-board, tunnel and left pilot tunnel 1 and right pilot tunnel 2 invade tunnel scope is removed in segmentation;
10), lay splash guard 19, build secondary lining 20, complete tunnel structure construction (as shown in Figure 10).
The present invention is directed to the shortcoming of CRD engineering method and PBA engineering method, propose to adopt first wall rear arch intersection median septum method (being called for short PBCRD engineering method, Pile-Beam-Center Cross Diaphragm), to solve problems of the prior art.In the present invention, the first pilot tunnel at construction arch springing position, to construct in pilot tunnel more vertical skirt piles of constructing below vertical longeron and pilot tunnel, then under advance support protection, CRD engineering method partial excavation tunnel is adopted, form the Tunnel with median septum and interim horizontal support, vertical longeron and vertically skirt piles are as the abutment wall of Tunnel, horizontal girder is as the Guan Liang of piling wall, top preliminary bracing is supported on longeron, horizontal temporary support is connected with longeron (or piling wall), arch strata pressure can be passed on longeron and skirt piles, and then logical longeron and skirt piles are passed in deep formation, thus malformation that is that cause is excessive because its arch springing position sedimentation is excessive to avoid vault construction.After tunnel excavation completes, median septum and horizontal support are removed in segmentation, along tunnel surrounding continuous laying waterproofing course, and monobloc cast secondary lining.
The present invention is applicable to features as poor geologic condition, buried depth is shallow, width is large and require strict tunnel to construction settlement, arch load can be passed in time on the high longeron of supporting capacity and skirt piles, effective minimizing Settlement in Construction Period, working security is high, and preliminary bracing structural integrity is good, waterproofing course can continuous laying, monobloc cast secondary lining, and good water-proof effect, quality is secure.
Claims (4)
1. a method for tunnel construction for first wall rear arch intersection median septum, it is characterized in that, it comprises the following steps:
1), to construct left pilot tunnel (1) and right pilot tunnel (2);
2), in the bottom of left pilot tunnel (1) to construct downwards left side stake (3), the right stake (4) of constructing downwards in the bottom of right pilot tunnel (2);
3), in left pilot tunnel (1) construct left longeron (5), right pilot tunnel (2) in construction right vertical beam (6);
4), from left pilot tunnel (1) right side excavation the first branch (7), and the first arch preliminary bracing (8) of the first branch (7) that constructs, septum primum wall (9) and the first horizontal support (10), the first horizontal support (10) is arranged between left pilot tunnel (1) and septum primum wall (9);
5), from right pilot tunnel (2) left side excavation the second branch (11), and the second arch preliminary bracing (12) of the second branch (11) that constructs and the second horizontal support (13), second arch preliminary bracing (12) and the first arch preliminary bracing (8) form the preliminary bracing of arch, tunnel, and the second horizontal support (13) is arranged between right pilot tunnel (2) and septum primum wall (9);
6), below left side stake (3) right side, the first horizontal support (10), the 3rd branch (14) is excavated, and the septum secundum wall (15) of the 3rd branch (14) that constructs and the 3rd horizontal support (16), septum secundum wall (15) upper end is connected with septum primum wall (9) lower end, and the 3rd horizontal support (16) is arranged between left side stake (3) and septum secundum wall (15);
7), below the right stake (4) left side, the second horizontal support (13), the 4th branch (17) is excavated, and the 4th horizontal support (18) of the 4th branch (17) that constructs, the 4th horizontal support (18) is arranged between the right stake (4) and septum secundum wall (15);
8), according to step 6,7 excavate downwards, until tunnel has all excavated;
9), after tunnel excavation completes, the structure of horizontal support in mid-board, tunnel and left pilot tunnel (1) and right pilot tunnel (2) intrusion tunnel scope is removed in segmentation;
10), lay splash guard (19), build secondary lining (20), complete tunnel structure construction.
2. the method for tunnel construction of a kind of first wall rear arch intersection median septum according to claim 1, is characterized in that: described left side stake (3) and the right stake (4) adopt hand excavated pile or bored pile to construct.
3. the method for tunnel construction of a kind of first wall rear arch intersection median septum according to claim 1, is characterized in that: described left longeron (5) and right vertical beam (6) are reserved with the built-in fitting be connected with arch preliminary bracing, the first horizontal support (10), the second horizontal support (13).
4., according to the method for tunnel construction of a kind of first wall rear arch intersection median septum shown in claim 1, it is characterized in that: described 3rd horizontal support (16) is fixedly connected with left side stake (3), described 4th horizontal support (18) is fixedly connected with left side stake (4).
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104295301B (en) * | 2014-08-14 | 2016-04-27 | 山东科技大学 | The construction method in a kind of shallow buried covered excavation cracked rock mass subway tunnel crosspoint |
| CN104500093B (en) * | 2014-12-16 | 2017-02-22 | 湖南科技大学 | Method for positioning temporary middle walls in large-section tunnel supporting structure of formation with soft top and hard bottom |
| CN105736002A (en) * | 2016-04-30 | 2016-07-06 | 北京城乡建设集团有限责任公司 | Method for excavating middle tunnel in large-span subway ventilation duct by using combined supporting structure |
| CN109915150A (en) * | 2019-04-26 | 2019-06-21 | 重庆交通大学 | A kind of pile foundation pre-reinforcement supporting construction and its construction method controlling tunnel subsidence |
| CN113236262B (en) * | 2021-06-29 | 2023-08-15 | 中铁八局集团第一工程有限公司 | Cantilever tunneling machine tunnel transverse channel roof-picking swivel construction method |
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| CN1707067A (en) * | 2004-06-11 | 2005-12-14 | 同济大学 | Method for building large-span tunnel with preformation structure |
| CN101225742A (en) * | 2007-10-17 | 2008-07-23 | 中铁十八局集团有限公司 | Construction method of shallow buried underground excavating tunnel super large section using PBA method |
| CN102654055A (en) * | 2012-05-21 | 2012-09-05 | 乐贵平 | Construction method for compound construction of large-scale underground space structure by holes, groove and piles |
| CN103195455A (en) * | 2013-03-11 | 2013-07-10 | 中铁二院工程集团有限责任公司 | Large section tunnel construction support and protection system and construction method under flabby geological environment |
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Patent Citations (4)
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| CN1707067A (en) * | 2004-06-11 | 2005-12-14 | 同济大学 | Method for building large-span tunnel with preformation structure |
| CN101225742A (en) * | 2007-10-17 | 2008-07-23 | 中铁十八局集团有限公司 | Construction method of shallow buried underground excavating tunnel super large section using PBA method |
| CN102654055A (en) * | 2012-05-21 | 2012-09-05 | 乐贵平 | Construction method for compound construction of large-scale underground space structure by holes, groove and piles |
| CN103195455A (en) * | 2013-03-11 | 2013-07-10 | 中铁二院工程集团有限责任公司 | Large section tunnel construction support and protection system and construction method under flabby geological environment |
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