CN103174434A - Dissymmetric double-linking-arch tunnel structure and construction method thereof - Google Patents
Dissymmetric double-linking-arch tunnel structure and construction method thereof Download PDFInfo
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- CN103174434A CN103174434A CN2013100819418A CN201310081941A CN103174434A CN 103174434 A CN103174434 A CN 103174434A CN 2013100819418 A CN2013100819418 A CN 2013100819418A CN 201310081941 A CN201310081941 A CN 201310081941A CN 103174434 A CN103174434 A CN 103174434A
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- 238000010276 construction Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 26
- 241000272525 Anas platyrhynchos Species 0.000 claims description 179
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 238000004078 waterproofing Methods 0.000 claims description 45
- 230000003014 reinforcing effect Effects 0.000 claims description 32
- 238000009412 basement excavation Methods 0.000 claims description 23
- 239000002689 soil Substances 0.000 claims description 22
- 239000011435 rock Substances 0.000 claims description 15
- 230000011218 segmentation Effects 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 238000012544 monitoring process Methods 0.000 description 3
- 210000005239 tubule Anatomy 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
Disclosed are a dissymmetric double-linking-arch tunnel structure and a construction method of the dissymmetric double-linking-arch tunnel structure. The structure comprises a small cave and a big cave, wherein the big cave is connected with the small cave. The construction method of the dissymmetric double-linking-arch tunnel structure successively includes the following steps: constructing a small cave advance support, constructing a small cave preliminary support, conducting construction of a preliminary support piece being embedded on the small cave preliminary support, constructing a small cave secondary lining, constructing a big cave advance support, constructing a big cave preliminary support, constructing big cave temporary middle partitioning walls, conducting integral connection of preliminary support connecting pieces on the big cave preliminary supporting and the small cave preliminary supporting, dismantling the big cave temporary middle partitioning walls at interval, and constructing a big cave secondary lining. The dissymmetric double-linking-arch tunnel structure and the method resolve the technical problems that in a traditional dissymmetric double-linking-arch tunnel construction process, abandoned work amount is large, cost is high, construction process is slow, and construction safety cannot be guaranteed.
Description
Technical field
The present invention relates to a kind of construction of tunnel structure and job practices thereof, particularly a kind of section is asymmetric duplex arch tunnel structure and job practices thereof.
Background technology
Due to construction of tunnel, when building the engineering such as subway, highway, railway, need to bend line be set in certain distance or the line of giving another the right of way, to guarantee the normal and safe operation of vehicle underground.This part bend line generally is designed to asymmetric duplex arch tunnel cross-section form, selects rational job practices, has the meaning of particular importance to guaranteeing its construction safety.Because its form of fracture is irregular, length is relatively short, can't adopt the heavy mechanical equipments such as shield machine to construct.Be pilot tunnel method in general employing of duplex arch method for tunnel construction for section, namely first apply middle base tunnel, after base tunnel is completed within it section apply middle wall concrete, rear excavation both sides, the method safety is low, workload large, the abandoned project amount is large, cost is high, will cause larger impact to overall construction speed, is unfavorable for total body construction arrangement.If adopt the large form of fracture of single arch, will significantly add span and the height of large tunnel structure, not only engineering quantity increases greatly, and has strengthened the security risk of construction.
Summary of the invention
The purpose of this invention is to provide a kind of asymmetric duplex arch tunnel structure and job practices thereof, solve in conventional construction method workload large, the abandoned project amount is large, and cost is high, and construction speed is slow, the technical problem that construction safety can not be guaranteed.
For achieving the above object, the present invention adopts following technical scheme:
a kind of asymmetric duplex arch tunnel structure, comprise duck eye and the large hole that is attached thereto, be provided with successively advance support on the country rock of described duck eye, the duck eye preliminary bracing, duck eye waterproofing course and duck eye secondary lining, be provided with successively advance support on the country rock in described large hole, large hole preliminary bracing, large hole waterproofing course and large hole secondary lining, at duck eye and large hole intersection, the steel member of the described duck eye preliminary bracing of every Pin be duck eye just prop up be embedded with at least two on the steel member at the beginning of connector, duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the end of each extension all is embedded with a steel member connecting plate,
The steel member of the described large hole preliminary bracing of every Pin is that the steel member is just propped up in large hole and described connector and the steel member connecting plate of just propping up is connected to form integral body one by one, makes the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing;
Described duck eye waterproofing course is connected as a single entity along duck eye and large hole intersection with large hole waterproofing course; The border of described duck eye secondary lining is embedded with the reinforcing bar connector, and large hole secondary lining reinforcing bar stretches into the reinforcing bar connector, makes large hole secondary lining and duck eye secondary lining become an overall structure.
The job practices of this asymmetric duplex arch tunnel structure comprises the construction in duck eye and large hole, and construction sequence is as follows:
Step 1: first the country rock of duck eye carried out advance support;
Step 2: adopt the benching tunnelling method excavation duck eye soil body and apply the duck eye preliminary bracing;
Step 3: at duck eye and large hole intersection, along the tunnel excavation direction, the steel member of every Pin duck eye preliminary bracing is that duck eye just props up on the steel member connector at the beginning of pre-buried at least two, duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the pre-buried row steel member connecting plate in the end of each extension, be the interval of just propping up steel member Pin and Pin by duck eye in whole duck eye, two row of pre-buried at least formation interval setting are connector and a row steel member connecting plate just;
Step 4: after the duck eye preliminary bracing is complete, lay the duck eye waterproofing course, do not seal along the duck eye waterproofing course of duck eye with large hole intersection;
Step 5: assembling reinforcement, apply the duck eye secondary lining, the border of duck eye secondary lining is provided with to reserve builds space and embedded bar connector, is used for docking with large hole secondary lining reinforcing bar;
Step 6: after duck eye secondary lining concrete reaches the intensity of designing requirement, larger hole country rock is carried out advance support;
Step 7: adopt and intersect the median septum method excavation large hole soil body and apply the preliminary bracing of large hole and the interim median septum in large hole, do not seal along duck eye and the described large hole preliminary bracing of large hole intersection, and at duck eye and large hole intersection, the steel member of every Pin large hole preliminary bracing is that the steel member is just propped up in large hole and described connector and the steel member connecting plate of just propping up is connected to form integral body one by one, makes the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing;
Step 8: after large hole preliminary bracing is complete, according to the sequence of construction in first inverted arch scope, in rear abutment wall and crown scope, segmentation is removed the interim median septum in large hole, is laid large hole waterproofing course, colligation large hole secondary lining reinforcing bar, build four steps of large hole secondary lining and intersect and carry out, wherein large hole waterproofing course and duck eye waterproofing course are connected as a single entity, large hole secondary lining reinforcing bar stretches into to reserve to build on reinforcing bar connector pre-buried in the space and is connected as a single entity, and constructs complete.
The steel member of the described duck eye preliminary bracing of every Pin is that duck eye just props up on the steel member connector at the beginning of pre-buried at least two, lays respectively at duck eye and just props up peak place, boundary and meet in advance interim median septum place, large hole with large hole.
In described step 3, just propping up connector is pre-embedded steel slab or embedded bar.
In described step 7, steel member and just connector employing bolt anchoring or welding are just propped up in large hole.
In described step 5, the order of building of duck eye secondary lining is followed successively by duck eye two lining inverted arch, duck eye two lining mid-boards and duck eye two lining crowns.
In described step 7, the large hole of the described intersection median septum method excavation soil body is about to large hole soil body layering partial excavation, first excavates the large hole soil body away from duck eye one side, then excavates the large hole soil body of opposite side, the outer boundaries of every part soil body applies the preliminary bracing of large hole, and inboard border applies interim median septum.
In described step 8, after large hole preliminary bracing is complete, the interim median septum in large hole and duck eye and the part duck eye preliminary bracing of hole intersection greatly in the inverted arch scope removed in first segmentation, lay large hole inverted arch waterproofing course and be connected as a single entity with the bottom of duck eye waterproofing course, colligation inverted arch reinforcing bar is built the inverted arch concrete and is formed large hole two lining inverted arch; Remaining interim median septum in large hole is removed in segmentation, applies large hole abutment wall and crown waterproofing course and is connected as a single entity with the top of duck eye waterproofing course, and colligation abutment wall and crown reinforcing bar are built abutment wall and crown concrete and formed large hole two mat wall and crowns.
In described step 8, described reinforcing bar connector is established two places altogether along duck eye and boundary, large hole, lays respectively at duck eye and serves as a contrast the boundary highs and lows with large hole two.
In described step 8, adopt along the excavation direction when removing the interim median septum in large hole and jump the section dismounting.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention takes the Construction Principle of similar one-sided wall pilot tunnel method, first excavates duck eye, then excavates large hole, can effectively reduce height and the span of large cross-section tunnel structure, compares full section method and constructs, and once excavates span less, and safety is better.
The present invention is on the basis of following the New Austrian Tunneling Method Construction Principle, excavate again large hole after first completing duck eye two linings in asymmetric duplex arch tunnel, compare traditional middle pilot tunnel method and first apply middle base tunnel, after base tunnel is completed within it section apply middle wall concrete, the sequence of construction of rear excavation both sides has reduced the disturbance number of times to adjacent structure, and safety is guaranteed.
In the present invention, duck eye adopts the benching tunnelling method construction, compares the median septum method or intersects the median septum method and construct, and has greatly reduced engineering quantity and construction speed is very fast, and can satisfy safety and quality requirement.
The present invention is by first connector pre-buried in the duck eye preliminary bracing, with the preliminary bracing of large hole be buckled in the duck eye preliminary bracing on, make the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing, reduce construction sequence, accelerating construction progress.
In the present invention, two of tunnel lining sequences of construction are followed successively by duck eye two lining inverted arch, duck eye two lining mid-boards, duck eye two lining crowns, large hole two lining inverted arch and large hole two lining crowns, needing branch repeatedly to construct with two linings in traditional middle pilot tunnel method duck eye and large hole compares, optimized working procedure, the construction substep is few, reduced the constuction joint setting, the waterproofing course segmentation is few, and waterproof quality is improved.
The present invention strictly follows the construction principle of " precocity ring, fast sealing, control are sunk ", have advantages of that construction speed is fast, cost is low, the construction difficulty action accomplishment is high, the present invention can be applicable to the tunneling construction of various geology country rocks, is specially adapted to the tunneling construction of the similar form of fractures of construction of tunnel such as subway, highway, railway.
Description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is the construction schematic diagram that construction method step one of the present invention, step 2 duck eye are topped bar.
Fig. 2 is the construction schematic diagram that construction method step two duck eyes of the present invention are got out of a predicament or an embarrassing situation.
Fig. 3 is the construction schematic diagram of construction method step four duck eye secondary linings of the present invention.
Fig. 4 is the construction schematic diagram in construction method step six of the present invention, step 7 the first hole.
Fig. 5 is the construction schematic diagram in construction method step of the present invention 7 second holes.
Fig. 6 is the construction schematic diagram in construction method step seven of the present invention the 3rd hole.
Fig. 7 is the construction schematic diagram in construction method step seven of the present invention the 4th hole.
Fig. 8 is the construction schematic diagram of construction method step eight of the present invention large hole two lining inverted arch.
Fig. 9 is the construction schematic diagram of construction method step eight of the present invention large hole two lining crowns.
Figure 10 is that the duck eye of node A in Fig. 7 just props up steel member connection partial enlarged drawing with the hole of being connected.
Figure 11 is that the duck eye of Node B in Fig. 9 connects partial enlarged drawing with the hole of being connected two lined steel muscle.
Figure 12 is the schematic diagram after in the embodiment of the present invention, the tunnel structure section is completed.
Reference numeral: 1-duck eye, the preliminary bracing of 2-duck eye, 2.1-duck eye preliminary bracing crown, 2.2-duck eye inverted arch of primary support, 3-duck eye secondary lining, 3.1-duck eye two lining inverted arch, 3.2-duck eye two lining mid-boards, 3.3-duck eye two lining crowns, the large hole of 4-, 5-large hole preliminary bracing, 5.1-the first hole preliminary bracing, 5.2-the second hole preliminary bracing, 5.3-the 3rd hole preliminary bracing, 5.4-the 4th interim median septum in the large hole of preliminary bracing 6-, hole, the large hole of 7-secondary lining, 7.1-large hole two lining inverted arch, 7.2-large hole two mat wall and crowns, the 8-advanced tubule, the 9-duck eye is topped bar, the 10-duck eye is got out of a predicament or an embarrassing situation, 11-duck eye waterproofing course, 12-the first hole, 13-the second hole, 14-the second hole, 15-the second hole, the large hole of 16-inverted arch waterproofing course, 17-large hole abutment wall and crown waterproofing course, the large hole tunnel center line of 18-, the large hole of 19-line midline, 20-duck eye tunnel center line, 21-duck eye line midline, the 22-duck eye just props up the steel member, 23-just props up connector, 24-just props up the steel member in large hole, 25-steel member connecting plate, the 26-duck eye just props up peak place, boundary with large hole, 27-meets interim median septum place, large hole in advance, 28-reserves and builds the space, the large hole of 29-secondary lining reinforcing bar, 30-reinforcing bar connector, 31-median septum steel member.
The specific embodiment
embodiment is referring to shown in Fig. 1-12, the section in a kind of asymmetric duplex arch tunnel is that duck eye intersects the forked type structure with large hole, comprise duck eye 1 and the large hole 4 that is attached thereto, be provided with successively advance support 8 on the country rock of described duck eye, duck eye preliminary bracing 2, duck eye waterproofing course 11 and duck eye secondary lining 3, be provided with successively advance support 8 on the country rock in described large hole, large hole preliminary bracing 5, large hole waterproofing course and large hole secondary lining 7, at duck eye and large hole intersection, the steel member of the described duck eye preliminary bracing of every Pin be duck eye just prop up be embedded with at least two on steel member 22 at the beginning of connector 23, duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the end of each extension is embedded with a steel member connecting plate 25,
The steel member of the described large hole preliminary bracing of every Pin is that steel member 24 is just propped up in large hole and described connector 23 and the steel member connecting plate 25 of just propping up is connected to form integral body one by one, makes the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing;
Described duck eye waterproofing course does not seal along duck eye and large hole intersection, and large hole waterproofing course and duck eye waterproofing course are connected as a single entity herein; The border of described duck eye secondary lining is embedded with reinforcing bar connector 30, and large hole secondary lining reinforcing bar 29 stretches into reinforcing bar connector 30, makes large hole secondary lining and duck eye secondary lining become an overall structure.
The job practices in this asymmetric duplex arch tunnel, construction sequence is as follows:
Step 1: shown in Figure 1, first the country rock of duck eye carried out advance support 8, set the advanced tubule outside the excavation contour line of duck eye 1 arch.
Step 2: shown in Fig. 1-2, adopt the benching tunnelling method excavation duck eye soil body and apply duck eye preliminary bracing 2, wherein the duck eye soil body can divide two-layer construction: first excavate duck eye and top bar 9 and apply duck eye preliminary bracing crown 2.1, then excavate duck eye and get out of a predicament or an embarrassing situation 10 and apply duck eye inverted arch of primary support 2.2, duck eye top bar 9 with duck eye 10 certain distances that stagger of getting out of a predicament or an embarrassing situation, the distance that staggers can be 3-5m.
step 3: shown in Figure 10, at duck eye and large hole intersection, along the tunnel excavation direction, the steel member of every Pin duck eye preliminary bracing is that duck eye just props up a pre-buried at least just connector 23 on steel member 22, it can be steel grating or steel bracket that duck eye just props up steel member 22, just prop up the interval of steel member (22) Pin and Pin by duck eye, two row that pre-buried formation interval arranges are a connector just, laying respectively at duck eye just props up peak place, boundary 26 and meets in advance interim median septum place, large hole 27 with large hole, can use pre-embedded steel slab or embedded bar as just propping up connector in this example, pre-buried connected mode is welding or anchoring,
Duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the pre-buried row steel member connecting plate 25 in the end of each extension, just prop up the interval of steel member (22) Pin and Pin by duck eye, the row steel member connecting plate that pre-buried formation interval arranges is provided with the three pre-buried tie points of row in so far duck eye preliminary bracing.
Step 4: shown in Figure 3, after duck eye preliminary bracing 2 is complete, lay duck eye waterproofing course 11, do not seal along the duck eye waterproofing course of duck eye with large hole intersection, namely the duck eye waterproofing course is not laid with large hole intersection in the duck eye left side.
Step 5: shown in Figure 11, assembling reinforcement, apply duck eye secondary lining 3, the border of duck eye secondary lining is provided with to reserve builds space 28 and embedded bar connector 30, be used for docking with large hole secondary lining reinforcing bar 29, build sequentially to be followed successively by and build duck eye two lining inverted arch 3.1, duck eye two lining mid-boards 3.2 and duck eye two lining crowns 3.3.
Step 6: shown in Figure 4, after duck eye secondary lining concrete reaches the intensity of designing requirement, larger hole country rock is carried out advance support 8, set advanced tubule 8 outside the excavation contour line of 4 arch, large hole.
Step 7: described intersection median septum method is excavated the large hole soil body and is about to large hole soil body layering partial excavation, first excavate the large hole soil body away from duck eye one side, excavate again the large hole soil body of opposite side, the outer boundaries of every part soil body applies large hole preliminary bracing 5, inboard border applies interim median septum 6, the present embodiment adopts the form excavation large hole soil body of double-deck four pilot tunnels of median septum method and applies large hole preliminary bracing 5, with the upper left, the lower-left, the upper right, four of bottom rights order is constructed, and is respectively the first hole 12, the second hole 13,14, the four holes 15, the 3rd hole;
Shown in Figure 4, at first excavate the first hole 12 and apply the left-half that the first hole preliminary bracing 5.1 is large hole preliminary bracing crown, then apply the interim median septum 6 in the first hole 12; Shown in Figure 5, continuing downwards excavation the second hole 13 and applying the second hole preliminary bracing 5.2 is the left-half of large hole inverted arch of primary support, the step that then applies interim median septum 6, the second holes 13 in the second hole 13 and the first hole 12 3-5m that staggers; Shown in Figure 6, continue to excavate the 3rd hole 14 to the right and apply the right half part that the 3rd hole preliminary bracing 5.3 is large hole preliminary bracing crown;
shown in Figure 10, duck eye and large hole intersection, the steel member of every Pin the 3rd hole preliminary bracing 5.3 is that the termination steel plate of steel grating or steel bracket is connected with first the connector 23 that peak place, boundary 26 is just propped up in duck eye and large hole, can adopt bolt to be fixedly connected with or to weld and form integral body, such the 3rd hole preliminary bracing 5.3 bottoms are overlapped on the haunch of duck eye preliminary bracing, to guarantee that top stress can effectively transmit, then apply the interim median septum 6 in the 3rd hole 14, median septum steel member 31 is connected with first the connector 23 that meets in advance interim median septum place, large hole 27, can adopt bolt to be fixedly connected with or to weld and form integral body,
Shown in Figure 7, continuing to excavate the 4th hole 15 downwards and apply the 4th hole preliminary bracing 5.4 is the right half part of large hole inverted arch of primary support, shown in Figure 10, the steel member of this part large hole preliminary bracing is that steel member 24 is just propped up in large hole and described connector 23 and the steel member connecting plate 25 of just propping up is connected to form integral body one by one, the three pre-buried tie points in place connect complete, make the preliminary bracing of large hole form together enclosed construction by the duck eye preliminary bracing.
Step 8: shown in Figure 8, after large hole preliminary bracing is complete, according to the deformation monitoring situation, according to the sequence of construction in first inverted arch scope, in rear abutment wall and crown scope, segmentation is removed the interim median septum in large hole, is laid large hole waterproofing course, colligation large hole secondary lining reinforcing bar 29 and build 7 four steps of large hole secondary lining and intersect and carry out, adopt along the excavation direction when wherein removing the interim median septum 6 in large hole and jump the section dismounting, carry out again the dismounting work of next section after namely the preceding paragraph two linings are completed;
The interim median septum in large hole and duck eye and the part duck eye preliminary bracing of hole intersection greatly in the inverted arch scope removed in first segmentation, this part duck eye preliminary bracing comprises the median septum steel member 31 that meets in advance interim median septum place, large hole 27 and just props up connector 23, lay large hole inverted arch waterproofing course 16 and be connected as a single entity with the bottom of duck eye waterproofing course 11, colligation inverted arch reinforcing bar is built the inverted arch concrete and is formed large hole two lining inverted arch 7.1; Shown in Figure 9, remaining interim median septum in large hole is removed in segmentation, apply large hole abutment wall and crown waterproofing course 17 and be connected as a single entity with the top of duck eye waterproofing course 11, colligation abutment wall and crown reinforcing bar, build abutment wall and crown concrete and form large hole two mat walls and crown 7.2, fill and reserve the space of building the space;
Shown in Figure 11, wherein large hole waterproofing course and duck eye waterproofing course are connected as a single entity, large hole secondary lining reinforcing bar 29 anchors into the described reservation of step 5 and builds on the pre-buried reinforcing bar connector 30 in space 28 and be connected as a single entity, anchor into the degree of depth more than or equal to 1m, described reinforcing bar connector 30 has a common boundary with large hole along duck eye and establishes altogether two places, lay respectively at duck eye and serve as a contrast the boundary highs and lows with large hole two, construct complete.
Shown in Figure 12, after the section construction was completed, duck eye was closed u-shaped cross-section, and large hole is as rear construction section, and its preliminary bracing and secondary lining all are buckled in type duck eye, form enclosed construction.Large hole tunnel center line 18, large hole line midline 19, duck eye tunnel center line 20 and duck eye line midline 21 are as shown in figure 12.
In interim median septum demolishing process, strengthen the monitoring to vault sedimentation and clearance convergence, instruct by information-aided construction and remove operation.If be out of shape excessively, should in time suspend dismounting, i iron and recover or take other reinforcement measures.Removing length can not be long, strengthens the monitoring to vault sedimentation and clearance convergence in demolishing process, accomplishes information-aided construction.
Each unit of the present invention needs to carry out temporary fixed in work progress, can set in the both sides, unit lock pin anchor tube and grouting and reinforcing.
If the present invention is applied in country rock when being the hard such as middle wind slap or diabase rock stratum, need to adopt the damping blast working when excavation the 3rd hole 14 and the 4th hole 15, make explosion drop to minimum on the impact of duck eye two linings.
Claims (10)
1. an asymmetric duplex is encircleed tunnel structure, the large hole (4) that comprises duck eye (1) and be attached thereto, be provided with successively advance support (8) on the country rock of described duck eye, duck eye preliminary bracing (2), duck eye waterproofing course (11) and duck eye secondary lining (3), be provided with successively advance support (8) on the country rock in described large hole, large hole preliminary bracing (5), large hole waterproofing course and large hole secondary lining (7), it is characterized in that: at duck eye and large hole intersection, the steel member of the described duck eye preliminary bracing of every Pin be duck eye just prop up be embedded with at least two on steel member (22) at the beginning of connector (23), duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the end of each extension all is embedded with a steel member connecting plate (25),
The steel member of the described large hole preliminary bracing of every Pin is that steel member (24) is just propped up in large hole and described connector (23) and the steel member connecting plate (25) of just propping up is connected to form integral body one by one, makes the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing;
Described duck eye waterproofing course is connected as a single entity along duck eye and large hole intersection with large hole waterproofing course; The border of described duck eye secondary lining is embedded with reinforcing bar connector (30), and large hole secondary lining reinforcing bar (29) stretches into reinforcing bar connector (30), makes large hole secondary lining and duck eye secondary lining become an overall structure.
2. the job practices of the described asymmetric duplex arch tunnel structure of claim 1, comprise the construction of duck eye (1) He Dadong (4), and it is characterized in that: construction sequence is as follows:
Step 1: first the country rock of duck eye carried out advance support (8);
Step 2: adopt the benching tunnelling method excavation duck eye soil body and apply duck eye preliminary bracing (2);
Step 3: at duck eye and large hole intersection, along the tunnel excavation direction, the steel member of every Pin duck eye preliminary bracing is that duck eye just props up a connector (23) at the beginning of upper pre-buried at least two of steel member (22), duck eye just props up steel member arch springing place horizontal segment and extends to large hole direction, the pre-buried row steel member connecting plate (25) in the end of each extension, be the interval of just propping up steel member (22) Pin and Pin by duck eye in whole duck eye, two row of pre-buried at least formation interval setting are connector and a row steel member connecting plate just;
Step 4: after the duck eye preliminary bracing is complete, lay duck eye waterproofing course (11), do not seal along the duck eye waterproofing course of duck eye with large hole intersection;
Step 5: assembling reinforcement, apply duck eye secondary lining (3), the border of duck eye secondary lining is provided with to reserve builds space (28) and embedded bar connector (30), is used for docking with large hole secondary lining reinforcing bar (29);
Step 6: after duck eye secondary lining concrete reaches the intensity of designing requirement, larger hole country rock is carried out advance support (8);
Step 7: adopt and intersect the median septum method excavation large hole soil body and apply large hole preliminary bracing (5) and the large interim median septum in hole (6), do not seal along duck eye and the described large hole preliminary bracing (5) of large hole intersection, and at duck eye and large hole intersection, the steel member of every Pin large hole preliminary bracing is that steel member (24) is just propped up in large hole and described connector (23) and the steel member connecting plate (25) of just propping up is connected to form integral body one by one, makes the preliminary bracing of large hole form enclosed construction together with the duck eye preliminary bracing;
Step 8: after large hole preliminary bracing is complete, according to the sequence of construction in first inverted arch scope, in rear abutment wall and crown scope, segmentation is removed the interim median septum in large hole, is laid large hole waterproofing course, colligation large hole secondary lining reinforcing bar (29), build (7) four steps of large hole secondary lining and intersect and carry out, wherein large hole waterproofing course and duck eye waterproofing course are connected as a single entity, large hole secondary lining reinforcing bar (29) stretches into to reserve to build on reinforcing bar connector (30) pre-buried in space (28) and is connected as a single entity, and constructs complete.
3. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, it is characterized in that: in described step 3, the steel member of the described duck eye preliminary bracing of every Pin is that duck eye just props up a connector (23) at the beginning of upper pre-buried at least two of steel member (22), lays respectively at duck eye and just props up peak place, boundary (26) and meet in advance interim median septum place, large hole (27) with large hole.
4. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, and it is characterized in that: in described step 3, just propping up connector (23) is pre-embedded steel slab or embedded bar.
5. a kind of asymmetric duplex according to claim 4 is encircleed the job practices in tunnel, it is characterized in that: in described step 7, steel member (24) and just connector (23) employing bolt anchoring or welding are just propped up in large hole.
6. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, it is characterized in that: in described step 5, the order of building of duck eye secondary lining (3) is followed successively by duck eye two lining inverted arch (3.1), duck eye two lining mid-boards (3.2) and duck eye two lining crowns (3.3).
7. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, it is characterized in that: in described step 7, the large hole of the described intersection median septum method excavation soil body is about to large hole soil body layering partial excavation, first excavate the large hole soil body away from duck eye one side, excavate again the large hole soil body of opposite side, the outer boundaries of every part soil body applies large hole preliminary bracing (5), and inboard border applies interim median septum (6).
8. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, it is characterized in that: in described step 8, after large hole preliminary bracing is complete, the interim median septum in large hole and duck eye and the part duck eye preliminary bracing of hole intersection greatly in the inverted arch scope removed in first segmentation, lay large hole inverted arch waterproofing course (16) and be connected as a single entity with the bottom of duck eye waterproofing course (11), colligation inverted arch reinforcing bar is built the inverted arch concrete and is formed large hole two lining inverted arch (7.1); Remaining interim median septum in large hole is removed in segmentation, apply large hole abutment wall and crown waterproofing course (17) and be connected as a single entity with the top of duck eye waterproofing course (11), colligation abutment wall and crown reinforcing bar are built abutment wall and crown concrete and are formed large hole two mat walls and crown (7.2).
9. a kind of asymmetric duplex according to claim 2 is encircleed the job practices in tunnel, it is characterized in that: in described step 8, described reinforcing bar connector (30) is established two places altogether along duck eye and boundary, large hole, lays respectively at duck eye and serves as a contrast the boundary highs and lows with large hole two.
10. a kind of asymmetric duplex according to claim 8 is encircleed the job practices in tunnel, it is characterized in that: in described step 8, adopt along the excavation direction when removing the interim median septum in large hole and jump the section dismounting.
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| CN112065479A (en) * | 2020-09-14 | 2020-12-11 | 中国建筑第八工程局有限公司 | Construction method of asymmetric multi-curve double-arch tunnel |
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