CN103174434B - Construction method of dissymmetric double-linking-arch tunnel structure - Google Patents

Construction method of dissymmetric double-linking-arch tunnel structure Download PDF

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Publication number
CN103174434B
CN103174434B CN201310081941.8A CN201310081941A CN103174434B CN 103174434 B CN103174434 B CN 103174434B CN 201310081941 A CN201310081941 A CN 201310081941A CN 103174434 B CN103174434 B CN 103174434B
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hole
duck eye
steel
construction
column
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CN103174434A (en
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肖龙鸽
孙贵华
杨昆鹏
傅启路
杨兵
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China Construction Civil Engineering Co Ltd
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China Construction Civil Engineering Co Ltd
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Abstract

Disclosed are 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

A kind of construction method of asymmetric double arch structure
Technical field
The present invention relates to a kind of construction of tunnel structure and construction method thereof, particularly a kind of section is asymmetric double arch structure and construction method thereof.
Background technology
Due to construction of tunnel, when building the engineerings such as subway, highway, railway in underground, need in certain distance, to arrange bend line or line of giving another the right of way, to ensure the normal of vehicle and safe operation.This part bend line is generally designed to asymmetric double arch form of fracture, selects rational construction method, to ensureing that its construction safety has the meaning of particular importance.Because its form of fracture is irregular, length is relatively short, and the heavy mechanical equipments such as shield machine cannot be adopted to construct.Be pilot tunnel method during double arch construction method generally adopts for section, namely middle base tunnel is first applied, middle wall concrete is applied therein after base tunnel completes, rear excavation both sides, the method safety is low, workload large, abandoned project amount is large, cost is high, will cause larger impact to overall construction speed, is unfavorable for total body construction arrangement.According to single arch big cross section form, will significantly add span and the height of large tunnel structure, not only engineering quantity increases greatly, and increases the security risk of construction.
Summary of the invention
The object of this invention is to provide a kind of construction method of asymmetric double arch structure, solve workload in conventional construction method large, 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 double arch structure, the large hole comprising duck eye and be attached thereto, the country rock of described duck eye is provided with advance support successively, duck eye preliminary bracing, duck eye waterproofing course and duck eye secondary lining, the country rock in described large hole is provided with advance support successively, the preliminary bracing of large hole, large hole waterproofing course and large hole secondary lining, at duck eye and large hole intersection, the steel beam column of duck eye preliminary bracing described in every Pin and duck eye just prop up on steel beam column and are embedded with a connector at the beginning of at least two pieces, duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, the end of each extension is all embedded with one piece of steel beam column junction plate,
Steel beam column is just propped up in the steel beam column of large hole preliminary bracing described in every Pin and large hole and described just a connector and steel beam column junction plate are connected to form entirety one by one, makes the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing;
Described duck eye waterproofing course and large hole waterproofing course are connected as a single entity along duck eye and large hole intersection; The border of described duck eye secondary lining is embedded with reinforcing bar connector, and large hole secondary lining reinforcing bar stretches into reinforcing bar connector, makes large hole secondary lining and duck eye secondary lining become an overall structure.
The construction method of this asymmetric double arch structure, comprise the construction in duck eye and large hole, construction sequence is as follows:
Step one: first advance support is carried out to the country rock of duck eye;
Step 2: adopt the benching tunnelling method excavation duck eye soil body and apply duck eye preliminary bracing;
Step 3: at duck eye and large hole intersection, along tunnel excavation direction, the steel beam column of every Pin duck eye preliminary bracing and duck eye just prop up a connector at the beginning of pre-buried at least two pieces on steel beam column, duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, the pre-buried row steel beam column junction plate in end of each extension, namely the interval of steel beam column Pin and Pin is just propped up in whole duck eye by duck eye, spaced two row of at least pre-buried formation just connector and a row steel beam column junction plate;
Step 4: after duck eye preliminary bracing, lay duck eye waterproofing course, the duck eye waterproofing course along duck eye and large hole intersection is not closed;
Step 5: assembling reinforcement, applies duck eye secondary lining, and the border of duck eye secondary lining is provided with reserved casting space and embedded bar connector, for docking with large hole secondary lining reinforcing bar;
Step 6: after duck eye secondary lining concrete reaches the intensity of designing requirement, then advance support is carried out to large hole country rock;
Step 7: adopt intersection median septum method excavate the large hole soil body and apply the interim median septum of the preliminary bracing of large hole and large hole, described large hole preliminary bracing along duck eye and large hole intersection is not closed, and at duck eye and large hole intersection, steel beam column is just propped up in the steel beam column of every Pin large hole preliminary bracing and large hole and described just a connector and steel beam column junction plate are connected to form entirety one by one, makes the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing;
Step 8: after large hole preliminary bracing, according to the sequence of construction within the scope of first inverted arch, within the scope of rear abutment wall and crown, segmentation is removed the interim median septum in large hole, is laid large hole waterproofing course, colligation large hole secondary lining reinforcing bar, build large hole secondary lining four steps 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 on reinforcing bar connector pre-buried in reserved casting space and is connected as a single entity, and constructs complete.
The steel beam column of duck eye preliminary bracing described in every Pin and duck eye just to prop up on steel beam column a connector at the beginning of pre-buried at least two pieces, lay respectively at duck eye and the interim median septum place in peak place, boundary and the large hole of pre-terminated is just propped up in large hole.
In described step 3, just a connector is pre-embedded steel slab or embedded bar.
In described step 7, large hole is just propped up steel beam column and is adopted bolt anchoring with a first connector or weld.
In described step 5, the order of building of duck eye secondary lining is followed successively by that duck eye two serves as a contrast inverted arch, duck eye two serves as a contrast mid-board and duck eye two serves as a contrast crown.
In described step 7, described intersection median septum method excavates the large hole soil body by large hole soil body layering partial excavation, first excavates the large hole soil body away from duck eye 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 border, inner side applies interim median septum.
In described step 8, after the preliminary bracing of large hole, the interim median septum in large hole within the scope of first segmentation dismounting inverted arch and the part duck eye preliminary bracing of duck eye and large hole intersection, 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, builds inverted arch concrete and forms large hole two and serve as a contrast inverted arch; Remaining interim median septum in large hole is removed in segmentation, and apply large hole abutment wall and crown waterproofing course and be connected as a single entity with the top of duck eye waterproofing course, colligation abutment wall and crown reinforcing bar, build abutment wall and crown concrete forms large hole two mat wall and crown.
In described step 8, described reinforcing bar connector has a common boundary along duck eye and large hole and establishes two places altogether, lays respectively at duck eye and large hole two serves as a contrast boundary highs and lows.
In described step 8, adopt along excavation direction when removing the interim median septum in large hole and jump section and remove.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention takes the Construction Principle of similar single side heading method, first excavates duck eye, then excavates large hole, effectively can reduce height and the span of large cross-section tunnel structure, compare full section method and construct, and once excavate span less, safety is better.
The present invention is on the basis of following New Austrian Tunneling Method Construction Principle, large hole is excavated again after the duck eye two first completed in asymmetric double arch serves as a contrast, compare traditional middle pilot tunnel method and first apply middle base tunnel, middle wall concrete is applied therein after base tunnel completes, the sequence of construction of rear excavation both sides decreases the disturbance number of times to adjacent structure, and safety is guaranteed.
In the present invention, duck eye adopts benching tunnelling method construction, compares median septum method or intersects median septum method and construct, and greatly reduces engineering quantity and construction speed is very fast, and can meet safety and quality requirement.
The preliminary bracing of large hole, by first connector pre-buried in duck eye preliminary bracing, is buckled in in duck eye preliminary bracing by the present invention, makes the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing, reduces construction sequence, accelerating construction progress.
In the present invention, the two lining sequences of construction in tunnel are followed successively by that duck eye two serves as a contrast inverted arch, duck eye two serves as a contrast mid-board, duck eye two serves as a contrast crown, large hole two serves as a contrast inverted arch and large hole two serves as a contrast crown, with traditional in pilot tunnel method duck eye repeatedly to construct with the two Chen Xu branches in large hole and compare, optimize working procedure, construction substep is few, decrease constuction joint to arrange, waterproofing course segmentation is few, and waterproof quality is improved.
The construction principle that the present invention strictly follows " precocity ring, fast closed, control sinking ", there is the advantage that construction speed is fast, cost is low, construction difficulty action accomplishment is high, the present invention can be applicable to the boring construction of various geology country rock, is specially adapted to the boring construction of the similar form of fractures of construction of tunnel such as subway, highway, railway.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
The construction schematic diagram that Fig. 1 is construction method step one of the present invention, step 2 duck eye is topped bar.
Fig. 2 is the construction schematic diagram that construction method step two duck eye of the present invention is got out of a predicament or an embarrassing situation.
Fig. 3 is the construction schematic diagram of construction method step four duck eye secondary lining of the present invention.
Fig. 4 is the construction schematic diagram in construction method step six of the present invention, step 7 first hole.
Fig. 5 is the construction schematic diagram in construction method step 7 second hole of the present invention.
Fig. 6 is the construction schematic diagram in construction method step seven of the present invention 3rd hole.
Fig. 7 is the construction schematic diagram in construction method step seven of the present invention 4th hole.
Fig. 8 is the construction schematic diagram that the large hole two of construction method step eight of the present invention serves as a contrast inverted arch.
Fig. 9 is the construction schematic diagram that the large hole two of construction method step eight of the present invention serves as a contrast crown.
Figure 10 is that the duck eye of Fig. 7 interior joint A just props up steel beam column with large hole and is connected partial enlarged drawing.
Figure 11 is that the duck eye of Fig. 9 interior joint B and large hole two serve as a contrast bar connecting partial enlarged drawing.
Figure 12 be in the embodiment of the present invention tunnel structure section complete after schematic diagram.
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 serves as a contrast inverted arch, 3.2-duck eye two serves as a contrast mid-board, 3.3-duck eye two serves as a contrast crown, the large hole of 4-, 5-large hole preliminary bracing, 5.1-first hole preliminary bracing, 5.2-second hole preliminary bracing, 5.3-the 3rd hole preliminary bracing, the interim median septum in the large hole of preliminary bracing 6-, 5.4-the 4th hole, 7-large hole secondary lining, 7.1-is large, and hole two serves as a contrast inverted arch, 7.2-large hole two mat wall and crown, 8-advanced tubule, 9-duck eye is topped bar, 10-duck eye is got out of a predicament or an embarrassing situation, 11-duck eye waterproofing course, 12-first hole, 13-second hole, 14-second hole, 15-second hole, 16-large hole inverted arch waterproofing course, 17-large hole abutment wall and crown waterproofing course, the large hole tunnel center line of 18-, 19-large hole line midline, the little hole tunnel center line of 20-, 21-duck eye line midline, 22-duck eye just props up steel beam column, 23-just props up connector, 24-is large, and steel beam column is just propped up in hole, 25-steel beam column junction plate, peak place, boundary is just propped up in 26-duck eye and large hole, interim median septum place, the large hole of 27-pre-terminated, 28-reserves casting space, 29-large hole secondary lining reinforcing bar, 30-reinforcing bar connector, 31-median septum steel beam column.
Detailed description of the invention
Embodiment is see shown in Fig. 1-12, a kind of section of asymmetric double arch is duck eye forked type structure crossing with large hole, the large hole 4 comprising duck eye 1 and be attached thereto, the country rock of described duck eye is provided with advance support 8 successively, duck eye preliminary bracing 2, duck eye waterproofing course 11 and duck eye secondary lining 3, the country rock in described large hole is provided with advance support 8 successively, large hole preliminary bracing 5, large hole waterproofing course and large hole secondary lining 7, at duck eye and large hole intersection, the steel beam column of duck eye preliminary bracing described in every Pin and duck eye just prop up on steel beam column 22 and are embedded with a connector 23 at the beginning of at least two pieces, duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, the end of each extension is embedded with one piece of steel beam column junction plate 25,
The steel beam column of large hole preliminary bracing described in every Pin and large hole are just propped up steel beam column 24 and are connected to form entirety one by one with described just a connector 23 and steel beam column junction plate 25, make the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing;
Described duck eye waterproofing course is not closed 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 construction method of this asymmetric double arch, construction sequence is as follows:
Step one: shown in Figure 1, first carries out advance support 8 to the country rock of duck eye, outside the excavation contour line of duck eye 1 arch, set advanced tubule.
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 is topped bar and 9 to be got out of a predicament or an embarrassing situation with duck eye and 10 to stagger certain distance, and the distance that staggers can be 3-5m.
Step 3: shown in Figure 10, at duck eye and large hole intersection, along tunnel excavation direction, the steel beam column of every Pin duck eye preliminary bracing and duck eye just prop up a pre-buried at least just connector 23 on steel beam column 22, it can be steel grating or steel bracket that duck eye just props up steel beam column 22, the interval of steel beam column (22) Pin and Pin is just propped up by duck eye, spaced two row of a pre-buried formation just connector, lay respectively at duck eye and the interim median septum place 27 in peak place, boundary 26 and the large hole of pre-terminated is just propped up in large hole, pre-embedded steel slab or embedded bar can be used in this example as just propping up connector, pre-buried connected mode is welding or anchoring,
Duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, the pre-buried row steel beam column junction plate 25 in end of each extension, the interval of steel beam column (22) Pin and Pin is just propped up by duck eye, the spaced row steel beam column junction plate of pre-buried formation, so far duck eye preliminary bracing is provided with the pre-buried tie point of three row.
Step 4: shown in Figure 3, after duck eye preliminary bracing 2, lay duck eye waterproofing course 11, the duck eye waterproofing course along duck eye and large hole intersection is not closed, and does not namely lay duck eye waterproofing course with large hole intersection on the left of duck eye.
Step 5: shown in Figure 11, assembling reinforcement, apply duck eye secondary lining 3, the border of duck eye secondary lining is provided with reserved casting space 28 and embedded bar connector 30, for docking with large hole secondary lining reinforcing bar 29, building order and being followed successively by and building that duck eye two serves as a contrast inverted arch 3.1, duck eye two serves as a contrast mid-board 3.2 and duck eye two serves as a contrast crown 3.3.
Step 6: shown in Figure 4, after duck eye secondary lining concrete reaches the intensity of designing requirement, then carries out advance support 8 to large hole country rock, outside the excavation contour line of arch, large hole 4, set advanced tubule 8.
Step 7: described intersection median septum method excavates the large hole soil body by large hole soil body layering partial excavation, first excavate the large hole soil body away from duck eye side, excavate the large hole soil body of opposite side again, the outer boundaries of every part soil body applies large hole preliminary bracing 5, border, inner side applies interim median septum 6, the present embodiment adopts the form of double-deck four pilot tunnels of median septum method excavate the large hole soil body and apply large hole preliminary bracing 5, with upper left, lower-left, upper right, four, bottom right order is constructed, and is respectively the first hole 12, second hole 13, the 3rd hole 15, hole the 14, four;
Shown in Figure 4, first excavate the first hole 12 and apply the first hole preliminary bracing 5.1 i.e. left-half of large hole preliminary bracing crown, then applying the interim median septum 6 in the first hole 12; Shown in Figure 5, continue excavation the second hole 13 downwards and also apply the second hole preliminary bracing 5.2 i.e. left-half of large hole inverted arch of primary support, the step in interim median septum 6, second hole 13 and the first hole 12 that then apply the second hole 13 staggers 3-5m; Shown in Figure 6, continue excavate the 3rd hole 14 to the right and apply the 3rd hole preliminary bracing 5.3 i.e. right half part of large hole preliminary bracing crown;
Shown in Figure 10, duck eye and large hole intersection, the steel beam column of every Pin the 3rd hole preliminary bracing 5.3 and the termination steel plate of steel grating or steel bracket are connected with first the connector 23 that peak place, boundary 26 is just propped up in duck eye and large hole, bolt can be adopted to be fixedly connected with or to weld and to form entirety, such 3rd hole preliminary bracing 5.3 bottom is overlapped on the haunch of duck eye preliminary bracing, to ensure that top stress can effectively transmit, then the interim median septum 6 in the 3rd hole 14 is applied, median septum steel beam column 31 is connected with first the connector 23 at interim median septum place, the large hole of pre-terminated 27, bolt can be adopted to be fixedly connected with or to weld and to form entirety,
Shown in Figure 7, continue excavate the 4th hole 15 downwards and apply the 4th hole preliminary bracing 5.4 i.e. right half part of large hole inverted arch of primary support, shown in Figure 10, the steel beam column of this part large hole preliminary bracing and large hole are just propped up steel beam column 24 and are connected to form entirety one by one with described just a connector 23 and steel beam column junction plate 25, the three pre-buried tie points in place connect complete, make the preliminary bracing of large hole form enclosed construction together by duck eye preliminary bracing.
Step 8: shown in Figure 8, after the preliminary bracing of large hole, according to deformation monitoring situation, according to the sequence of construction within the scope of first inverted arch, within the scope of rear abutment wall and crown, 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 large hole secondary lining 7 four steps and intersect and carry out, adopt along excavation direction when wherein removing the interim median septum 6 in large hole and jump section and remove, namely the preceding paragraph two carries out the dismounting work of next section again after having served as a contrast;
The interim median septum in large hole within the scope of first segmentation dismounting inverted arch and the part duck eye preliminary bracing of duck eye and large hole intersection, this part duck eye preliminary bracing comprises the median septum steel beam column 31 at interim median septum place 27, the large hole of pre-terminated 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, builds inverted arch concrete and forms large hole two and serve as a contrast 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 forms large hole two mat wall and crown 7.2, fill the space of reserved casting 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 to anchor into described in step 5 on the pre-buried reinforcing bar connector 30 of reserved casting space 28 and is connected as a single entity, anchor into the degree of depth and be more than or equal to 1m, described reinforcing bar connector 30 has a common boundary along duck eye and large hole and establishes two places altogether, lay respectively at duck eye and large hole two serves as a contrast boundary highs and lows, construct complete.
Shown in Figure 12, after section has been constructed, duck eye is closed u-shaped cross-section, and large hole is as rear construction section, and its preliminary bracing and secondary lining are all buckled in type duck eye, forms enclosed construction.Large hole tunnel center line 18, large hole line midline 19, little hole 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 settlement and clearance convergence, instructed by information-aided construction and remove operation.If be out of shape excessive, dismounting should be suspended in time, i iron recovers or takes other reinforcement measures.Removing length can not be long, strengthens the monitoring to Vault settlement and clearance convergence, accomplish information-aided construction in demolishing process.
The each unit of the present invention needs to carry out temporary fixed in work progress, can set lock pin anchor tube and grouting and reinforcing in unit both sides.
If the present invention is applied in country rock when being the hard rock stratum such as middle wind slap or diabase, needs when excavation the 3rd hole 14 and the 4th hole 15 to adopt Shock reducing blasting construction, make explosion drop to minimum on the impact that duck eye two serves as a contrast.

Claims (6)

1. the construction method of an asymmetric double arch structure, comprise the construction of duck eye (1) He great Dong (4), it is characterized in that: the large hole (4) that described asymmetric double arch structure comprises duck eye (1) and is attached thereto, the country rock of described duck eye is provided with successively advance support (8), duck eye preliminary bracing (2), duck eye waterproofing course (11) and duck eye secondary lining (3), the country rock in described large hole is provided with successively advance support (8), large hole preliminary bracing (5), large hole waterproofing course and large hole secondary lining (7);
At duck eye and large hole intersection, the steel beam column of duck eye preliminary bracing described in every Pin and duck eye just prop up on steel beam column (22) and are embedded with a connector (23) at the beginning of at least two pieces, duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, and the end of each extension is all embedded with one piece of steel beam column junction plate (25);
The steel beam column of large hole preliminary bracing described in every Pin and large hole are just propped up steel beam column (24) and are connected to form entirety one by one with described just a connector (23) and steel beam column junction plate (25), make the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing;
Described duck eye waterproofing course and large hole waterproofing course are connected as a single entity along duck eye and large hole intersection; 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;
Construction sequence is as follows:
Step one: first advance support (8) is carried out to the country rock of duck eye;
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 tunnel excavation direction, the steel beam column of every Pin duck eye preliminary bracing and duck eye just prop up a connector (23) at the beginning of upper pre-buried at least two pieces of steel beam column (22), duck eye just props up steel beam column arch springing place horizontal segment and extends to great Dong direction, the pre-buried row steel beam column junction plate (25) in end of each extension, namely the interval of steel beam column (22) Pin and Pin is just propped up in whole duck eye by duck eye, spaced two row of at least pre-buried formation just connector and a row steel beam column junction plate;
The steel beam column of duck eye preliminary bracing described in every Pin and duck eye just prop up a connector (23) at the beginning of upper pre-buried at least two pieces of steel beam column (22), lay respectively at duck eye and the interim median septum place (27) in peak place, boundary (26) and the large hole of pre-terminated is just propped up in large hole;
Step 4: after duck eye preliminary bracing, lay duck eye waterproofing course (11), the duck eye waterproofing course along duck eye and large hole intersection is not closed;
Step 5: assembling reinforcement, applies duck eye secondary lining (3), and the border of duck eye secondary lining is provided with reserved casting space (28) and embedded bar connector (30), for docking with large hole secondary lining reinforcing bar (29);
Step 6: after duck eye secondary lining concrete reaches the intensity of designing requirement, then advance support (8) is carried out to large hole country rock;
Step 7: adopt intersection median septum method excavate the large hole soil body and apply large hole preliminary bracing (5) and large hole interim median septum (6), described large hole preliminary bracing (5) along duck eye and large hole intersection is not closed, and at duck eye and large hole intersection, the steel beam column of every Pin large hole preliminary bracing and large hole are just propped up steel beam column (24) and are connected to form entirety one by one with described just a connector (23) and steel beam column junction plate (25), make the preliminary bracing of large hole form enclosed construction together with duck eye preliminary bracing;
Step 8: after large hole preliminary bracing, according to the sequence of construction within the scope of first inverted arch, within the scope of rear abutment wall and crown, 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 large hole secondary lining (7) four steps 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) is stretched on reinforcing bar connector (30) pre-buried in reserved casting space (28) and is connected as a single entity, and constructs complete;
Segmentation dismounting order is: the interim median septum in large hole within the scope of first segmentation dismounting inverted arch and the part duck eye preliminary bracing of duck eye and large hole intersection, 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, builds inverted arch concrete and forms large hole two and serve as a contrast 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, build abutment wall and crown concrete forms large hole two mat wall and crown (7.2);
Adopt along excavation direction when removing the interim median septum in large hole and jump section and remove.
2. the construction method of a kind of asymmetric double arch structure according to claim 1, is characterized in that: in described step 3, just props up connector (23) for pre-embedded steel slab or embedded bar.
3. the construction method of a kind of asymmetric double arch structure according to claim 2, is characterized in that: in described step 7, and large hole is just propped up steel beam column (24) and adopted bolt anchoring with a first connector (23) or weld.
4. the construction method of a kind of asymmetric double arch structure according to claim 1, it is characterized in that: in described step 5, the order of building of duck eye secondary lining (3) is followed successively by that duck eye two serves as a contrast inverted arch (3.1), duck eye two serves as a contrast mid-board (3.2) and duck eye two serves as a contrast crown (3.3).
5. the construction method of a kind of asymmetric double arch structure according to claim 1, it is characterized in that: in described step 7, described intersection median septum method excavates the large hole soil body by large hole soil body layering partial excavation, first excavate the large hole soil body away from duck eye side, excavate the large hole soil body of opposite side again, the outer boundaries of every part soil body applies large hole preliminary bracing (5), and border, inner side applies interim median septum (6).
6. the construction method of a kind of asymmetric double arch structure according to claim 1, it is characterized in that: in described step 8, described reinforcing bar connector (30) is had a common boundary along duck eye and large hole and is established two places altogether, lays respectively at duck eye and large hole two serves as a contrast boundary highs and lows.
CN201310081941.8A 2013-03-15 2013-03-15 Construction method of dissymmetric double-linking-arch tunnel structure Active CN103174434B (en)

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CN110043290A (en) * 2019-06-03 2019-07-23 徐公文 A kind of large section tri-arch tunnel construction method
CN111810163A (en) * 2020-06-02 2020-10-23 中铁十八局集团有限公司 Nine-lane double-arch construction method for underground excavation through underground longitudinal and transverse channels
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