CN111456760A - Prefabricated temporary inverted arch and tunnel lining structure and construction method thereof - Google Patents
Prefabricated temporary inverted arch and tunnel lining structure and construction method thereof Download PDFInfo
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- CN111456760A CN111456760A CN202010207497.XA CN202010207497A CN111456760A CN 111456760 A CN111456760 A CN 111456760A CN 202010207497 A CN202010207497 A CN 202010207497A CN 111456760 A CN111456760 A CN 111456760A
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- 238000010276 construction Methods 0.000 title claims abstract description 79
- 239000011435 rock Substances 0.000 claims abstract description 65
- 239000002689 soil Substances 0.000 claims abstract description 24
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 69
- 239000010959 steel Substances 0.000 claims description 69
- 238000009412 basement excavation Methods 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000005422 blasting Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007363 ring formation reaction Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- OFCNXPDARWKPPY-UHFFFAOYSA-N allopurinol Chemical compound OC1=NC=NC2=C1C=NN2 OFCNXPDARWKPPY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The cross section of the prefabricated temporary inverted arch is arc-shaped, the prefabricated unit plate comprises a structural pile construction hole penetrating through a plate body, a connecting end is arranged on the end face of the front end of the plate body, a receiving end is arranged on the end face of the rear end of the plate body, and inverted arch connecting pieces are respectively pre-buried in the middle of the end faces of the left end and the right end of the plate body, which are matched with the connecting end, of the receiving end. The tunnel lining structure comprises a primary support structure, a waterproof layer and a secondary lining structure, wherein the primary support structure is formed by enclosing a prefabricated temporary inverted arch and other primary support structures. The tunnel lining structure further comprises reinforced concrete piles with rock structures embedded in the holes. The method can effectively control the deformation of the stratum and the surrounding environment caused by the tunnel construction of the soft soil stratum by the drilling and blasting method, has the advantages of quick installation, convenience for the construction of the structural pile, improvement of the construction efficiency and the like, and can effectively improve the primary support construction quality of the tunnel of the soft soil stratum.
Description
Technical Field
The invention belongs to the field of tunnels, and particularly relates to a prefabricated temporary inverted arch for construction of a structural pile in a soft soil area and a construction method thereof.
Background
With the development of underground space in China, attention is paid to deformation of stratum and surrounding buildings or structures caused by tunnel construction in soft soil areas. In the process of drilling and blasting tunnel construction, in order to avoid deformation in a tunnel and influence on the surrounding environment, a temporary inverted arch needs to be arranged, and the temporary inverted arch and a side wall primary support are sealed to form a ring, so that deformation in the tunnel and stratum can be effectively reduced, and the safety of surrounding buildings or structures is protected. The temporary inverted arch is generally of the same shotcrete and steel frame construction as the primary support of the side wall. In addition, because the bearing capacity of the foundation of the soft soil stratum is not enough, structural piles are required to be arranged to ensure the safety and stability of the tunnel after the tunnel is put into operation.
However, the construction of the drilling and blasting method tunnel structure pile in the soft soil area still has the following problems: a. the positioning of the structural pile is easy to deviate, and the construction of a secondary lining and a waterproof layer is influenced; b. the phenomena of difficulty in compaction, insufficient strength, uneven thickness and the like exist in the concrete sprayed at the temporary inverted arch part, and cracks are easily generated when later construction machinery acts on the temporary inverted arch; c. need be when the construction of structural pile at interim inverted arch trompil, the inverted arch steelframe deviation destroys the integrality and the bearing capacity of inverted arch when leading to the construction of structural pile.
Disclosure of Invention
The invention aims to provide a prefabricated temporary inverted arch and tunnel lining structure and a construction method thereof, which aim to solve the technical problems that the positioning of structural piles is easy to deviate and the construction of a secondary lining and a waterproof layer is influenced, and also aim to solve the technical problem that the quality control of concrete sprayed at the position of the temporary inverted arch is difficult; still need destroy the integrality of invert and the technical problem of bearing capacity when solving structure stake construction time need be at interim invert trompil, invert steelframe deviation and leading to structure stake construction.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a prefabricated interim invert, includes reinforced concrete's the hunch body, the hunch body is formed by prefabricated unit board longitudinal connection, the transversal arc of personally submitting of prefabricated unit board, prefabricated unit board is including the structural pile construction hole that runs through the plate body, the vertical in bank setting of plate body is followed in structural pile construction hole, be equipped with the link that sets up along the vertical full length of plate body on the front end terminal surface of plate body, be equipped with on the rear end terminal surface of plate body along the vertical full length of plate body be provided with the end of accepting that suits with the link, it cooperatees with the link to accept the end, both ends terminal surface is pre-buried between two parties respectively has the invert connecting piece.
Each prefabricated unit plate is provided with 1-2 rows of structural pile construction holes, and each row is provided with 2-4 structural pile construction holes.
Two adjacent prefabricated unit boards are connected with the connecting end in a matched mode through the connecting end, the connecting end is equipped with the long protruding rib all the way between two parties, the connecting end is equipped with the long recess all the way between two parties, the protruding rib matches with the recess.
A tunnel lining structure comprises a primary support structure, a waterproof layer and a secondary lining structure, wherein the primary support structure is formed by enclosing a prefabricated temporary inverted arch and primary support other structures which are primary support side walls and primary support arch tops and comprise a primary support steel frame, primary support concrete and steel frame connecting pieces,
the bottom end part of the primary support steel frame is pre-embedded with a steel frame connecting piece, the left and right end faces of the prefabricated temporary inverted arch are respectively and fixedly connected with the steel frame connecting piece through the inverted arch connecting piece, the primary support concrete is sprayed and coated on the primary support steel frame and also coated on the inverted arch connecting piece and the steel frame connecting piece, the prefabricated temporary inverted arch and other primary support structures are enclosed to form a primary support structure, the waterproof layer is integrally laid on the inner wall surface of the primary support structure, the secondary lining structure is integrally constructed on the inner wall surface of the waterproof layer,
the tunnel lining structure further comprises reinforced concrete in-hole embedded rock structure piles, the diameter of the in-hole embedded rock structure piles is smaller than that of the structural pile construction holes, the number of the in-hole embedded rock structure piles is matched with that of the structural pile construction holes, the in-hole embedded rock structure piles vertically penetrate through the structural pile construction holes from bottom to top, the tops of the in-hole embedded rock structure piles are fixedly connected with the two lining structures, and the bottoms of the in-hole embedded rock structure piles are embedded into surrounding rocks of the tunnel.
The two-lining structure is formed by enclosing two lining inverted arches, two lining side walls and two lining arch tops, the top of the longitudinal rib of the hole embedded rock structure pile is fixedly connected with the main rib of the two lining inverted arches, and the hole embedded rock structure pile is not connected with the prefabricated temporary inverted arch.
The inner arc profile of the cross section of the prefabricated temporary inverted arch is matched with the outer profile of the cross section of the secondary lining inverted arch, the primary supporting side wall is of an arc structure, the inner and outer profiles of the cross section of the primary supporting side wall are matched with the outer profiles of the secondary lining side wall, and the inner and outer profiles of the cross section of the primary supporting arch are matched with the outer profiles of the secondary lining arch.
The inverted arch connecting piece is a rectangular steel plate, the steel frame connecting piece is a rectangular steel plate with the same size as the inverted arch connecting piece, a first bolt connecting hole is formed in the inverted arch connecting piece, a second bolt connecting hole corresponding to the first bolt connecting hole is formed in the steel frame connecting piece, and the first bolt connecting hole is aligned to the second bolt connecting hole and is fixedly connected with the second bolt connecting hole through a connecting bolt.
The surface of the inverted arch connecting piece is flush with the end surfaces of the left end and the right end of the plate body, the steel frame connecting piece is fixedly connected to the outer side of the surface of the primary steel frame,
the connecting bolt comprises a screw rod and nuts at two ends, the screw rod sequentially penetrates through the first bolt connecting hole and the second bolt connecting hole, the double nuts comprise pre-embedded first nuts which are arranged inside the prefabricated temporary inverted arch and attached to the back side of the inverted arch connecting piece, and the second nuts are fastened to the outer side of the steel frame connecting piece.
A construction method of a tunnel lining structure comprises the following construction steps:
step one, designing and prefabricating a prefabricated temporary inverted arch: manufacturing a template according to a primary tunnel support design drawing, then manufacturing a group of prefabricated unit plates, embedding an inverted arch connecting piece into the prefabricated unit plates, and determining the position, the size and the arrangement mode of construction holes of the structural piles according to the drawing for prefabricating;
step two, excavating the soil body at the upper part of the soft soil stratum tunnel: excavating a section of tunnel, wherein the width of an excavation footage is consistent with that of the prefabricated unit plates, excavating by adopting mechanical subsection, and firstly excavating an upper soil body;
step three, erecting a primary support steel frame: erecting a primary support steel frame in the tunnel immediately after excavation is finished, and presetting steel frame connecting pieces on the primary support steel frame corresponding to the positions of the inverted arch connecting pieces;
step four, excavating the lower soil body and constructing a prefabricated temporary inverted arch: when the inverted arch is excavated, the prefabricated temporary inverted arch is ensured to be fully contacted with a soft soil layer, then an inverted arch field is leveled, the temporary inverted arch is placed at the design position of an excavation section in a mechanical hoisting mode, and then the inverted arch connecting piece and the steel frame connecting piece are fixedly connected and sealed to form a ring;
step five, sealing the primary support structure: the primary support steel frame, the inverted arch connecting piece and the steel frame connecting piece are coated with the sprayed primary support concrete to form an operation cycle of a primary support structure;
step six, constructing the piles with the rock structures embedded in the holes: the construction machinery of the hole embedded rock structure pile is placed on the prefabricated temporary inverted arch, the hole embedded rock structure pile is constructed on the surrounding rock, the top of the hole embedded rock structure pile penetrates through a structure pile construction hole, the hole embedded rock structure pile is completed one by one, and the hole embedded rock structure pile and the prefabricated temporary inverted arch are of a separated structure;
step seven, the waterproof layer is applied: constructing a waterproof layer on the inner contour of the primary support structure; the waterproof layer between the rock structure pile embedded in the hole and the secondary lining structure is constructed during secondary lining construction;
step eight, constructing a two-lining structure: when the secondary lining structure is constructed, the top of the longitudinal bar of the rock structure pile embedded in the hole is fixedly connected with the main bar of the secondary lining inverted arch to form a permanent stress structure;
step nine, constructing the next operation cycle, and repeating the step two to the step three;
step ten, flattening the inverted arch field, placing the prefabricated unit plates at the position of an excavation section, aligning the connecting end of the next prefabricated unit plate to the bearing end of the previous prefabricated unit plate, then performing mortise-tenon connection, and then fixedly connecting the inverted arch connecting piece and the steel frame connecting piece to form a closed ring;
step eleven, repeating the step five to the step eight to complete the operation cycle;
and step twelve, repeating the step nine to the step eleven until the construction of the tunnel lining structure is completed.
In the first step, the width of the prefabricated temporary inverted arch is calculated and determined according to stratum conditions, stratum parameters, burial depth and the surrounding environment deformation control standard, the form of the prefabricated temporary inverted arch comprises thickness, width, concrete strength and reinforcing bars, the width is 0.5-1.5 m, the width is determined according to tunnel span, the width of the prefabricated temporary inverted arch and the stratum parameters, the length of the rock-embedded structural pile in the hole is determined according to bedrock depth, and the rock embedding depth is larger than 3 m.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the prefabricated temporary inverted arch is a prefabricated structure, so that the construction quality and the rigidity of the temporary inverted arch structure are ensured; after the excavation is finished, the steel plate can be immediately applied to play a role in controlling stratum deformation, and after the steel plate is connected with the upper side wall primary support structure through the reserved steel plate, the primary support can be accelerated to be sealed to form a ring, the stratum deformation can be better and faster controlled, and the construction safety is guaranteed.
The joints are arranged among the prefabricated unit plates, and the temporary inverted arch forms a beam with high rigidity in the longitudinal direction of the tunnel, so that the longitudinal load can be effectively transmitted, the longitudinal uneven settlement of the tunnel can be controlled, and the stability of the tunnel face of the tunnel can be better controlled.
In the tunnel lining structure, the inner contour of the prefabricated temporary inverted arch is consistent with the outer contour arc of the two-lining inverted arch, so that the phenomena of stress concentration, cavities under the two-lining inverted arch and the like are prevented while the construction quality of the two-lining is guaranteed.
The tunnel lining structure also comprises a constructed in-hole rock structure pile, and the in-hole rock structure pile can directly transmit the upper load to bedrock, so that the structural deformation caused by uneven settlement of the stratum and later-stage stratum settlement is prevented. The construction hole of structural pile has been reserved to prefabricated interim invert, and prefabricated interim invert when just propping up realization quick closed cyclization with side wall shotcrete, can also provide conditions such as location, place for the construction of the embedded rock structure stake in hole. Structural pile construction machinery places and will have higher stability on this structure, has ensured structural pile's construction quality, and after the rock-socketed structural pile construction with prefabricated interim invert complete separation, pours into a whole with two linings in later stage for the upper portion load transmits the basement rock smoothly, has ensured that tunnel structure operation phase disappearance stratum inhomogeneous settlement and because of the structural deformation that the soil body warp and appear.
The method effectively controls the deformation of the stratum and the surrounding environment caused by the tunnel construction of the soft soil stratum by the drilling and blasting method, has the advantages of quick installation, convenience in construction of the structural pile, improvement of the construction efficiency and the like, and can effectively improve the primary support construction quality of the tunnel of the soft soil stratum.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a prefabricated temporary inverted arch.
Fig. 2 is a schematic structural view of a section a-a in fig. 1.
Figure 3 is a schematic cross-sectional view of the tunnel lining structure of the present invention.
Fig. 4 is a partially enlarged schematic view of a tunnel lining structure.
Fig. 5 is a schematic structural view of an inverted arch connector.
Fig. 6 is a schematic structural view of a steel frame connector.
Reference numerals: 1-prefabricated unit plate, 11-structural pile construction hole, 12-connecting end, 13-bearing end, 14-inverted arch connecting piece, 2-primary support other structure, 21-primary support steel frame, 22-steel frame connecting piece, 23-primary support concrete, 3-waterproof layer, 4-secondary lining structure, 5-hole embedded rock structure pile, 6-connecting bolt, 61-screw rod, 62-first nut, 63-second nut, 7-first bolt connecting hole and 8-second bolt connecting hole.
Detailed Description
The embodiment is shown in fig. 1-2, a prefabricated temporary inverted arch comprises an arch body made of reinforced concrete, the arch body is formed by longitudinally connecting prefabricated unit plates 1, the cross sections of the prefabricated unit plates 1 are arc-shaped, each prefabricated unit plate 1 comprises a structural pile construction hole 11 penetrating through a plate body, the structural pile construction holes 11 are arranged in rows along the longitudinal direction of the plate body, a connecting end 12 arranged along the longitudinal length of the plate body is arranged on the front end face of the plate body, a receiving end 13 matched with the connecting end 12 is arranged on the rear end face of the plate body along the longitudinal length of the plate body, the receiving end 13 is matched with the connecting end 12, and inverted arch connecting pieces 14 are respectively embedded in the middle of the left end face and the right end face of the plate body.
Each prefabricated unit plate 1 is provided with 1-2 rows of structural pile construction holes 11, and each row is provided with 2-4 structural pile construction holes 11. In this embodiment, each prefabricated unit plate 1 is provided with 2 rows of structural pile construction holes 11, and each row is provided with 2 structural pile construction holes 11. Two adjacent prefabricated unit boards 1 are connected with connecting end 12 through accepting end 13 between vertically, connecting end 12 is equipped with the fin of leading to long one in the centre, accept end 13 and be equipped with the recess of leading to long one in the centre, the fin cooperatees mortise-tenon joint with the recess.
Referring to fig. 3-6, a tunnel lining structure comprises a primary support structure, a waterproof layer 3 and a secondary lining structure 4, wherein the primary support structure is formed by enclosing a prefabricated temporary inverted arch and primary support other structures, and the primary support other structures 2 are primary support side walls and primary support arches and comprise primary support steel frames 21, primary support concrete 23 and steel frame connecting pieces 22.
The bottom end part of the primary support steel frame 21 is pre-embedded with a steel frame connecting piece 22, the left and right end faces of the prefabricated temporary inverted arch are respectively fixedly connected with the steel frame connecting piece 22 through an inverted arch connecting piece 14, the primary support concrete 23 is sprayed and coated on the primary support steel frame 21, the inverted arch connecting piece 14 and the steel frame connecting piece 22 are also coated, the prefabricated temporary inverted arch and other primary support structures are enclosed to form a primary support structure, the waterproof layer 3 is integrally laid on the inner wall surface of the primary support structure, the secondary lining structure 4 is integrally constructed on the inner wall surface of the waterproof layer 3,
the tunnel lining structure further comprises reinforced concrete in-hole rock structure piles 5, the diameter of the in-hole rock structure piles 5 is smaller than the diameter of the structure pile construction hole 11, the number of the in-hole rock structure piles 5 is matched with the number of the structure pile construction hole 11, the in-hole rock structure piles 5 vertically penetrate through the structure pile construction hole 11 from bottom to top, the tops of the in-hole rock structure piles 5 are fixedly connected with the two lining structures 4, and the bottoms of the in-hole rock structure piles 5 are embedded into surrounding rocks of the tunnel.
The two-lining structure 4 is formed by enclosing two lining inverted arches, two lining side walls and two lining arch tops, the top of the longitudinal rib of the hole embedded rock structure pile 5 is fixedly connected with the main rib of the two lining inverted arches, and the hole embedded rock structure pile 5 is not connected with the prefabricated temporary inverted arch.
The inner arc profile of the cross section of the prefabricated temporary inverted arch is matched with the outer profile of the cross section of the secondary lining inverted arch, the primary supporting side wall is of an arc structure, the inner and outer profiles of the cross section of the primary supporting side wall are matched with the outer profiles of the secondary lining side wall, and the inner and outer profiles of the cross section of the primary supporting arch are matched with the outer profiles of the secondary lining arch.
The surface of the inverted arch connecting piece 14 is flush with the end faces of the left end and the right end of the plate body, and the steel frame connecting piece 22 is fixedly connected to the outer side of the surface of the primary support steel frame 21. The inverted arch connecting piece 14 is a rectangular steel plate, the steel frame connecting piece 22 is a rectangular steel plate with the same size as the inverted arch connecting piece 14, a first bolt connecting hole 7 is formed in the inverted arch connecting piece 14, a second bolt connecting hole 8 corresponding to the first bolt connecting hole 7 is formed in the steel frame connecting piece 22, and the first bolt connecting hole 7 is aligned with the second bolt connecting hole 8 and is fixedly connected with the second bolt connecting hole through a connecting bolt 6. In this embodiment, four first bolt connection holes 7 and four second bolt connection holes 8 are formed at four corners of each steel plate. Connecting bolt 6 includes the nut at screw rod 61 and both ends, screw rod 61 runs through first bolt connection hole 7 and second bolt connection hole 8 in proper order, two nuts include pre-buried inside the prefabricated interim invert, hug closely the dorsal first nut 62 of invert connecting piece 14, still including fastening to the second nut 63 in the steelframe connecting piece 22 outside.
A construction method of a tunnel lining structure comprises the following construction steps:
step one, designing and prefabricating a prefabricated temporary inverted arch: manufacturing a template according to a primary tunnel support design drawing, then manufacturing a group of prefabricated unit plates 1, embedding an inverted arch connecting piece 14 into the prefabricated unit plates 1, and determining the position, size and arrangement mode of the structural pile construction holes 11 according to the drawing for prefabricating; all the prefabricated temporary inverted arches in the same tunnel can be made by a set of templates.
In the first step, the width of the prefabricated temporary inverted arch is determined according to stratum conditions, stratum parameters, burial depth and the surrounding environment deformation control standard, the form of the prefabricated temporary inverted arch comprises thickness, width, concrete strength and reinforcing bars, the width is 0.5-1.5 m, and the width is determined according to tunnel span, the width of the prefabricated temporary inverted arch and the stratum parameters.
Step two, excavating the soil body at the upper part of the soft soil stratum tunnel: and excavating a section of tunnel, wherein the excavation footage is consistent with the width of the prefabricated unit plates 1, and the excavation is carried out by adopting mechanical subsection excavation, and firstly, excavating the upper soil body.
Step three, erecting a primary support steel frame 21: and immediately erecting a primary support steel frame 21 in the tunnel after excavation is finished, and presetting a steel frame connecting piece 22 on the primary support steel frame 21 at a position corresponding to the inverted arch connecting piece 14.
Step four, excavating the lower soil body and constructing a prefabricated temporary inverted arch: when excavating to the invert, guarantee that prefabricated interim invert fully contacts with soft soil stratum, then level the invert place, will make interim invert of system and place the design position at the excavation section through the mode of machinery hoist and mount, then seal the cyclization with fixed connection between invert connecting piece 14 and steelframe connecting piece 22.
Step five, sealing the primary support structure: the primary support steel frame 21, the inverted arch connecting piece 14 and the steel frame connecting piece 22 are coated by the sprayed primary support concrete 23 to form a working cycle of a primary support structure. The primary support closed loop is quickly realized, and the formation deformation can be better controlled.
Step six, constructing the hole embedded rock structure pile 5: the length of the rock structure pile 5 embedded in the hole is determined according to the depth of the bedrock, and the rock embedding depth is larger than 3 m. The construction machinery of the embedded rock structure stake of hole 5 is placed on prefabricated interim invert, executes on the country rock and makes the embedded rock structure stake of hole 5, and the structure stake construction hole 11 is run through at the top of the embedded rock structure stake of hole 5, and the embedded rock structure stake of hole 5 is accomplished one by one, and the embedded rock structure stake of hole 5 is the disconnect-type structure with prefabricated interim invert.
Step seven, the waterproof layer 3 is applied: constructing a waterproof layer 3 on the inner contour of the primary support structure; and the waterproof layer 3 between the rock structure pile 5 embedded in the hole and the secondary lining structure 4 is constructed during secondary lining construction.
Step eight, constructing a secondary lining structure 4: when the two-lining structure 4 is constructed, the top of the longitudinal bar of the rock structure pile 5 embedded in the hole is fixedly connected with the main bar of the two-lining inverted arch to form a permanent stress structure.
And step nine, constructing the next operation cycle, and repeating the step two to the step three.
Step ten, leveling an inverted arch field, placing the prefabricated unit plate 1 at an excavation section position, aligning the connecting end 12 of the next prefabricated unit plate 1 with the bearing end 13 of the previous prefabricated unit plate 1, then performing mortise-tenon connection, and then fixedly connecting the inverted arch connecting piece 14 with the steel frame connecting piece 22 to form a closed ring; longitudinal positioning is realized through mortise and tenon connection, longitudinal stability of the tunnel can be guaranteed, and the tunnel is longitudinally connected into a whole, so that formation deformation is better controlled.
And step eleven, repeating the step five to the step eight to complete the operation cycle.
And step twelve, repeating the step nine to the step eleven until the construction of the tunnel lining structure is completed.
Claims (10)
1. The utility model provides a prefabricated interim invert, includes reinforced concrete's arch body which characterized in that: the arched body is formed by prefabricated unit board (1) longitudinal connection, the arc is personally submitted in prefabricated unit board (1) transversal, prefabricated unit board (1) is including structure stake construction hole (11) that runs through the plate body, the vertical in bank setting of plate body is followed in structure stake construction hole (11), be equipped with link (12) that set up along the vertical logical length of plate body on the front end terminal surface of plate body, be equipped with on the rear end terminal surface of plate body along the vertical logical length of plate body be provided with link (12) the adapted accept end (13), accept end (13) and link (12) cooperate, both ends terminal surface is pre-buried in the middle respectively has inverted arch connecting piece (14) about the plate body.
2. The prefabricated temporary invert according to claim 1, characterized in that: each prefabricated unit plate (1) is provided with 1-2 rows of structural pile construction holes (11), and each row is provided with 2-4 structural pile construction holes (11).
3. Prefabricated temporary invert according to claim 1 or 2, characterized in that: two adjacent prefabricated unit boards (1) are connected with connecting end (12) through accepting end (13) cooperation between vertically, connecting end (12) are equipped with the fin of a logical length between two parties, accept end (13) and be equipped with the recess of a logical length between two parties, the fin cooperatees with the recess.
4. The utility model provides a tunnel lining structure, includes first supporting construction, waterproof layer (3) and two lining structures (4), its characterized in that: the primary support structure is formed by enclosing the prefabricated temporary inverted arch and the primary support other structures according to any one of claims 1 to 3, wherein the primary support other structures (2) are primary support side walls and primary support vault and comprise primary support steel frames (21), primary support concrete (23) and steel frame connecting pieces (22),
the bottom end part of the primary support steel frame (21) is pre-embedded with a steel frame connecting piece (22), the left and right end faces of the prefabricated temporary inverted arch are fixedly connected with the steel frame connecting piece (22) through an inverted arch connecting piece (14), the primary support concrete (23) is sprayed and coated on the primary support steel frame (21) and also coated on the inverted arch connecting piece (14) and the steel frame connecting piece (22), the prefabricated temporary inverted arch and other primary support structures are enclosed to form a primary support structure, the waterproof layer (3) is integrally laid on the inner wall surface of the primary support structure, the secondary lining structure (4) is integrally constructed on the inner wall surface of the waterproof layer (3),
the tunnel lining structure still includes reinforced concrete's the embedded rock structure stake in hole (5), the diameter of the embedded rock structure stake in hole (5) is less than the diameter of structure stake construction hole (11), the number of the embedded rock structure stake in hole (5) suits with the number of structure stake construction hole (11), and the embedded rock structure stake in hole (5) vertically runs through structure stake construction hole (11) from bottom to top, the top and two lining structure (4) fixed connection of the embedded rock structure stake in hole (5), in the embedded rock structure stake in hole (5) bottom embedding tunnel country rock.
5. The tunnel lining structure of claim 4, wherein: the two-lining structure (4) is formed by encircling two lining inverted arches, two lining side walls and two lining arch tops, the top of a longitudinal rib of the hole embedded rock structure pile (5) is fixedly connected with a main rib of the two lining inverted arches, and the hole embedded rock structure pile (5) is not connected with the prefabricated temporary inverted arch.
6. The tunnel lining structure of claim 5, wherein: the inner arc profile of the cross section of the prefabricated temporary inverted arch is matched with the outer profile of the cross section of the secondary lining inverted arch, the primary supporting side wall is of an arc structure, the inner and outer profiles of the cross section of the primary supporting side wall are matched with the outer profiles of the secondary lining side wall, and the inner and outer profiles of the cross section of the primary supporting arch are matched with the outer profiles of the secondary lining arch.
7. The tunnel lining structure of any one of claims 4 to 6, wherein: inverted arch connecting piece (14) are the rectangle steel sheet, steelframe connecting piece (22) are the rectangle steel sheet that size and inverted arch connecting piece (14) are the same, and it has first bolted connection hole (7) to open on inverted arch connecting piece (14), and it has second bolted connection hole (8) corresponding with first bolted connection hole (7) to open on steelframe connecting piece (22), and first bolted connection hole (7) align and pass through connecting bolt (6) fixed connection with second bolted connection hole (8).
8. The tunnel lining structure of claim 7, wherein: the surface of the inverted arch connecting piece (14) is flush with the end surfaces of the left end and the right end of the plate body, the steel frame connecting piece (22) is fixedly connected to the outer side of the surface of the primary support steel frame (21),
connecting bolt (6) include screw rod (61) and the nut at both ends, first bolt connection hole (7) and second bolt connection hole (8) are run through in proper order in screw rod (61), two nuts include pre-buried inside the prefabricated interim invert, hug closely dorsal first nut (62) of invert connecting piece (14), still including fastening second nut (63) to steelframe connecting piece (22) outside.
9. A construction method of a tunnel lining structure according to any one of claims 4 to 7, characterized by comprising the steps of:
step one, designing and prefabricating a prefabricated temporary inverted arch: manufacturing a template according to a primary tunnel support design drawing, then manufacturing a group of prefabricated unit plates (1), embedding an inverted arch connecting piece (14) into the prefabricated unit plates (1), and determining the position, the size and the arrangement mode of a structural pile construction hole (11) according to the drawing for prefabricating;
step two, excavating the soil body at the upper part of the soft soil stratum tunnel: excavating a section of tunnel, wherein the width of an excavation ruler is consistent with that of the prefabricated unit plate (1), excavating by adopting mechanical subsection, and firstly excavating an upper soil body;
step three, erecting a primary support steel frame (21): immediately erecting a primary support steel frame (21) in the tunnel after excavation is finished, and presetting a steel frame connecting piece (22) on the primary support steel frame (21) at a position corresponding to the inverted arch connecting piece (14);
step four, excavating the lower soil body and constructing a prefabricated temporary inverted arch: when the inverted arch is excavated, the prefabricated temporary inverted arch is ensured to be fully contacted with a soft soil layer, then an inverted arch field is leveled, the temporary inverted arch is placed at the design position of an excavation section in a mechanical hoisting mode, and then the inverted arch connecting piece (14) and the steel frame connecting piece (22) are fixedly connected and sealed to form a ring;
step five, sealing the primary support structure: the primary support concrete (23) is sprayed to coat the primary support steel frame (21), the inverted arch connecting piece (14) and the steel frame connecting piece (22) to form a working cycle of a primary support structure;
step six, constructing the hole embedded rock structure pile (5): the construction machinery of the hole embedded rock structure pile (5) is placed on the prefabricated temporary inverted arch, the hole embedded rock structure pile (5) is constructed on surrounding rocks, the top of the hole embedded rock structure pile (5) penetrates through a structure pile construction hole (11), the hole embedded rock structure pile (5) is completed one by one, and the hole embedded rock structure pile (5) and the prefabricated temporary inverted arch are of a separated structure;
step seven, the waterproof layer (3) is applied as follows: applying a waterproof layer (3) on the inner contour of the primary support structure; the waterproof layer (3) between the rock structure pile (5) embedded in the hole and the secondary lining structure (4) is constructed during secondary lining construction;
step eight, constructing a secondary lining structure (4): when the second lining structure (4) is constructed, the top of the longitudinal bar of the rock structure pile (5) embedded in the hole is fixedly connected with the main bar of the second lining inverted arch to form a permanent stress structure;
step nine, constructing the next operation cycle, and repeating the step two to the step three;
step ten, leveling an inverted arch field, placing the prefabricated unit plates (1) at the position of an excavation section, aligning the connecting end (12) of the next prefabricated unit plate (1) with the bearing end (13) of the previous prefabricated unit plate (1), then performing mortise-tenon connection, and then fixedly connecting the inverted arch connecting piece (14) with the steel frame connecting piece (22) to form a closed ring;
step eleven, repeating the step five to the step eight to complete the operation cycle;
and step twelve, repeating the step nine to the step eleven until the construction of the tunnel lining structure is completed.
10. The construction method of a tunnel lining structure according to claim 9, wherein: in the first step, the width of the prefabricated temporary inverted arch is calculated and determined according to stratum conditions, stratum parameters, burial depth and surrounding environment deformation control standards, the form of the prefabricated temporary inverted arch comprises thickness, width, concrete strength and reinforcing bars, the width is 0.5-1.5 m, the width is determined according to tunnel span, the width of the prefabricated temporary inverted arch and the stratum parameters, the length of the rock embedding structure pile (5) in the hole is determined according to bedrock depth, and the rock embedding depth is larger than 3 m.
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| CN2019109698276 | 2019-10-12 | ||
| CN201910969827 | 2019-10-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112454608A (en) * | 2020-11-12 | 2021-03-09 | 上海隧道工程有限公司 | Shallow-earthing large-diameter shield negative ring pipe piece structure and manufacturing method thereof |
| CN113202509A (en) * | 2021-05-07 | 2021-08-03 | 中交一公局集团有限公司 | Construction process for complex tunnel foundation treatment |
| CN113700499A (en) * | 2021-10-28 | 2021-11-26 | 中铁二十五局集团第三工程有限公司 | Vault prefabricated part and two lining tunnel trolleys |
| CN114215548A (en) * | 2022-01-20 | 2022-03-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for treating lining defect of tunnel of operation railway in assembled type |
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2020
- 2020-03-23 CN CN202010207497.XA patent/CN111456760A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112454608A (en) * | 2020-11-12 | 2021-03-09 | 上海隧道工程有限公司 | Shallow-earthing large-diameter shield negative ring pipe piece structure and manufacturing method thereof |
| CN113202509A (en) * | 2021-05-07 | 2021-08-03 | 中交一公局集团有限公司 | Construction process for complex tunnel foundation treatment |
| CN113700499A (en) * | 2021-10-28 | 2021-11-26 | 中铁二十五局集团第三工程有限公司 | Vault prefabricated part and two lining tunnel trolleys |
| CN114215548A (en) * | 2022-01-20 | 2022-03-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for treating lining defect of tunnel of operation railway in assembled type |
| CN114215548B (en) * | 2022-01-20 | 2023-12-29 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for repairing lining damage of operation railway tunnel by assembling type lining |
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