CN112145195B - Construction method of double-layer orthogonal frame culvert in underground excavation station - Google Patents
Construction method of double-layer orthogonal frame culvert in underground excavation station Download PDFInfo
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- CN112145195B CN112145195B CN202010909896.0A CN202010909896A CN112145195B CN 112145195 B CN112145195 B CN 112145195B CN 202010909896 A CN202010909896 A CN 202010909896A CN 112145195 B CN112145195 B CN 112145195B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to a construction method of a double-layer orthogonal frame culvert in an underground excavated station, which adopts a method of layering up and down, staggering left and right, staggering side and middle, and dividing a whole rescue channel double-layer frame culvert into eight parts for construction, wherein after concrete with middle wall, side wall and top plate structures is constructed, excavating a lower layer frame from longitudinal left and right in a staggered manner after the excavation of a longitudinal large-span transition section is finished, constructing concrete with left and right lower layer inverted arches and side wall structures, excavating a middle hole part after the construction of left and right inverted arches and side wall concrete is finished, and constructing an inverted arch and filling concrete in the middle hole. The invention has the characteristics of less material consumption, simple construction method, less process conversion and safe and reliable construction.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method of a double-layer orthogonal frame culvert in an underground excavation station.
Background
For the convenience of tourists, stations of tourist attractions are generally arranged near scenic spots to realize zero transfer. There are more and more tourist attractions stations designed to dig underground for topographical reasons or to reduce the impact on the environment of the scenic spot. The tourist attraction station has a large passenger flow due to a large number of tourists, and the requirement of a disaster prevention and rescue system of the station is high.
Because underground excavation stations generally adopt a single inclined shaft as a construction channel and a rescue channel, the rescue channel on one side inevitably needs to form a vertical intersection with a main line tunnel, a clearance above a section of a large-span transition section can be utilized for the situation, a flyover double-layer frame culvert form is adopted, the upper layer is a transverse rescue channel, and the lower layer is a longitudinal tunnel. At present, a safe and simple construction method for a large-span double-layer orthogonal frame culvert is not provided.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects and shortcomings in the prior art and provide the construction method of the double-layer orthogonal frame culvert in the underground excavation station, and the construction method has the advantages of less material consumption, simple construction method, less process conversion, safe and reliable construction and the like.
The purpose of the invention is realized by the following technical scheme: the construction method of the double-layer orthogonal frame culvert in the underground excavation station comprises the following steps that the double-layer orthogonal frame culvert comprises an upper layer frame culvert and a lower layer frame culvert; the upper layer frame culvert forms a transversely arranged upper layer culvert; the lower-layer frame culvert forms a longitudinally arranged left hole, a right hole and a middle hole of the lower-layer frame culvert; the bottom of the lower-layer frame culvert is of an inverted arch structure; the construction method of the double-layer orthogonal frame culvert comprises the following steps:
s1: constructing an upper layer culvert structure;
s2: constructing left and right hole structures of the lower-layer frame culvert;
s3: and constructing a middle hole structure of the lower-layer frame culvert.
Further, the step S1 includes the steps of:
s11: excavating an upper layer culvert and performing support construction;
s12: constructing concrete of an upper culvert structure;
the step S2 includes the steps of:
s21: carrying out staggered excavation and supporting construction on left and right holes of a lower-layer frame culvert;
s22: the left and right holes of the lower layer frame culvert are staggered to carry out bottom inverted arch lining construction;
s23: carrying out middle wall construction on the left and right holes of the lower-layer frame culvert;
s24: constructing side walls of the left and right holes of the lower-layer frame culvert;
the step S3 includes the steps of:
s31: excavating and constructing a middle culvert of the lower-layer frame;
s32: and (5) constructing an inverted arch lining at the bottom of the middle hole of the lower-layer frame culvert.
Further, the step S11 includes the steps of:
s111: constructing an advanced support at the top of the upper layer culvert;
s112: excavating an upper culvert by adopting an explosion mode, simultaneously carrying out primary support in time once per circulating footage, namely initially spraying concrete with the thickness of 5cm, erecting a grid steel frame, spraying concrete for the second time according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s113: applying a cartridge anchor rod of the upper culvert;
s114: after the excavation of the upper layer culvert is finished, applying a prestressed anchor rod and a prestressed anchor cable, tensioning to a designed tension, monitoring the stability of the tensioning stress, and then performing grouting locking;
s115: and spraying concrete with the steel bar net for the third time at the arch part of the upper culvert, re-spraying to the designed thickness, and covering the end of the prestressed anchor rod and the end anchor of the prestressed anchor rope.
Further, the step S12 includes the steps of:
s121: fixing a side formwork on the side wall of the upper culvert, binding a bottom plate steel bar and a short side wall steel bar of the upper culvert, reserving a steel bar connected with the middle wall, and pouring bottom plate and short side wall concrete;
s122: laying the arch wall waterproof layer of the upper culvert, embedding the drain pipe, binding the arch wall reinforcing steel bars, and pouring the arch wall concrete.
Further, the step S21 includes the steps of:
s211: after the concrete structure construction of the upper layer culvert is finished, excavating a left tunnel and a right tunnel of the lower layer frame culvert in a left-right staggered manner; the side close to the middle wall is provided with an opening boundary which is 1m wider than the middle wall, so that a template can be conveniently erected during concrete construction of the middle wall;
s212: constructing primary supports around a left hole and a right hole of a lower-layer frame culvert, namely initially spraying concrete with the thickness of 5cm, erecting a steel frame, and constructing a lock pin anchor pipe;
s213: spraying second-time concrete to the left tunnel and the right tunnel of the lower-layer frame culvert according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s214: applying common anchor rods, prestressed anchor rods and prestressed anchor cables of a left hole and a right hole of a lower-layer frame culvert, tensioning to a designed tension, monitoring the tension stress to be stable, and then performing grouting locking;
s215: and spraying concrete for the third time to the designed thickness to cover the end of the prestressed anchor rod and the anchor at the end of the prestressed anchor cable.
Further, the step S22 includes the steps of:
after the excavation and support of the left hole and the right hole of the lower-layer frame culvert are completely constructed, laying a short side wall waterproof layer below the left hole and the right hole of the lower-layer frame culvert and burying a drain pipe underground, binding inverted arch steel bars and short side wall steel bars of the left hole and the right hole of the lower-layer frame culvert, reserving steel bars connected with an arch wall, and pouring inverted arches, short side wall linings and inverted arch filling concrete of the left hole and the right hole of the lower-layer frame culvert.
Further, the step S23 includes the steps of:
s231: cleaning reserved steel bars of the upper culvert, erecting side templates of the middle wall, binding the steel bars of the middle wall, and connecting the reserved steel bars with the reserved steel bars of the upper culvert;
s232: and (5) supporting side forms of the middle wall close to the lower-layer framework culvert left hole and right hole, and pouring concrete of the partial structure.
Further, the step S24 includes the steps of:
s241: cleaning the reserved steel bars of the upper culvert, erecting side templates of the side walls close to the middle culvert, binding the steel bars of the side walls, and connecting the reserved steel bars with the reserved steel bars of the upper culvert;
s242: and (5) erecting side forms of the side walls close to the left hole and the right hole of the lower-layer frame culvert, and pouring concrete of the partial structure.
Further, the step S31 includes the steps of:
s311: excavating the middle tunnel of the lower-layer frame culvert in a step weak blasting and mechanical excavation mode;
s312: and (5) carrying out primary support construction at the bottom of the tunnel in the middle hole of the lower-layer frame culvert, namely spraying concrete with the thickness of 8cm.
Further, the step S32 includes the steps of:
s321: cleaning reserved steel bars of inverted arches of a left hole and a right hole of a culvert of the lower layer frame, binding steel bars of inverted arches at the bottom of a middle hole of the culvert of the lower layer frame, well connecting the reserved steel bars of the inverted arches of the left hole and the right hole of the culvert of the lower layer frame, and erecting a mold;
s322: and (4) carrying out inverted arch lining concrete pouring on the bottom of the middle hole of the lower-layer frame culvert, and carrying out inverted arch filling concrete pouring after initial setting.
In the double-layer frame culvert construction, when the upper layer side wall is constructed, because soil bodies behind the wall are not excavated, the construction difficulty of the side wall template and the bottom plate template is reduced, and the safety risk of side wall construction after side wall rock mass excavation is eliminated. The double-layer frame culvert is constructed by adopting an inverse building method, the rescue channel is constructed firstly, the progress is not influenced by a large-span transition section, convenience can be provided for the construction of the subsequent rescue channel, and the site safety management, the civilized construction and the like are greatly improved.
For a better understanding and practice, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a construction structure schematic diagram of the construction method of the double-layer orthogonal frame culvert in the underground excavation station of the invention.
Fig. 2 is a schematic construction view of an upper-layer frame culvert of the construction method of the double-layer orthogonal frame culvert in the underground excavation station.
Fig. 3 is a left-right hole construction schematic diagram of the construction method of the double-layer orthogonal frame culvert in the underground excavation station.
Fig. 4 is a schematic diagram of the construction of the middle tunnel of the construction method of the double-layer orthogonal frame culvert in the underground excavation station.
In the figure: 10. an upper culvert; 20. concrete of the upper culvert structure; 30. the lower layer frame contains left and right holes; 41. the lower layer frame contains inverted arches of a left hole and a right hole; 42. filling concrete into inverted arches of the left hole and the right hole of the lower-layer frame culvert; 50. a middle wall; 60. a side wall; 70. a middle hole of the lower-layer frame culvert; 81. the bottom inverted arch of the middle hole of the lower-layer frame culvert; 82. and (5) filling concrete into an inverted arch at the bottom of the middle hole of the lower-layer frame culvert.
Detailed Description
Referring to fig. 1 to 4, in the construction method of the double-layered orthogonal frame culvert in the underground excavated station according to the embodiment, the double-layered orthogonal frame culvert includes an upper layer frame culvert and a lower layer frame culvert; the upper layer frame culvert forms a transversely arranged upper layer culvert 10; the lower-layer frame culvert forms a lower-layer frame culvert left and right hole 30 and a lower-layer frame culvert middle hole 70 which are longitudinally arranged; the bottom of the lower frame culvert is of an inverted arch structure; the specific construction method comprises the following steps: s1: constructing the upper culvert 10 structure; s2: constructing left and right hole structures of the lower-layer frame culvert; s3: and constructing a middle hole structure of the lower-layer frame culvert.
Specifically, the step S1 includes the following steps:
s11: excavating and supporting construction of the upper layer culvert 10;
s12: constructing the upper culvert structure concrete 20;
more specifically, the step S11 includes the steps of:
s111: constructing an advance support at the top of the upper layer culvert 10;
s112: excavating an upper culvert 10 by adopting an explosion mode, simultaneously carrying out primary support in time once per cycle footage, namely, initially spraying concrete with the thickness of 5cm, erecting a grid steel frame, spraying concrete for the second time according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s113: applying the explosive roll anchor rods of the upper culvert 10;
s114: after the excavation of the upper culvert 10 is completed, applying a prestressed anchor rod and a prestressed anchor cable, tensioning to a designed tension, monitoring the stability of the tensioning stress, and then performing grouting locking;
s115: and (3) spraying concrete with a steel bar net for the third time at the 10 arch part of the upper culvert, re-spraying to the designed thickness, and covering the end of the prestressed anchor rod and the end anchor of the prestressed anchor rope.
More specifically, the step S12 includes the steps of:
s121: fixing side forms on the side walls of the upper culvert 10, binding bottom plate steel bars and short side wall 60 steel bars of the upper culvert 10, reserving connecting steel bars with the middle wall 50, and pouring bottom plate and short side wall 60 concrete;
s122: laying the arch wall waterproof layer of the upper culvert 10, burying the drain pipe, binding the arch wall reinforcing steel bars, and pouring the arch wall concrete.
Specifically, the step S2 includes the following steps:
s21: the left and right holes 30 of the lower layer frame culvert are excavated and supported in a staggered manner;
s22: the left and right holes 30 of the lower layer frame culvert are staggered to carry out lining construction of the inverted arch 41 at the bottom;
s23: constructing a middle wall 50 by using the left and right holes 30 of the lower-layer frame culvert;
s24: constructing the side walls 60 of the left and right holes 30 of the lower-layer frame culvert;
more specifically, the step S21 includes the steps of:
s211: after the concrete structure construction of the upper layer culvert 10 is finished, excavating a left tunnel and a right tunnel of the lower layer frame culvert in a left-right staggered manner; the side close to the middle wall 50 is provided with an opening boundary which is 1m wider than the middle wall 50, so that a template can be conveniently erected during concrete construction of the middle wall 50;
s212: constructing primary supports around a left hole and a right hole of a lower-layer frame culvert, namely initially spraying concrete with the thickness of 5cm, erecting a steel frame, and constructing a lock pin anchor pipe;
s213: spraying second-time concrete to the left tunnel and the right tunnel of the lower-layer frame culvert according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s214: applying common anchor rods, prestressed anchor rods and prestressed anchor cables of a left hole and a right hole of a lower-layer frame culvert, tensioning to a designed tension, monitoring the tension stress to be stable, and then performing grouting locking;
s215: and spraying concrete for the third time for constructing the left tunnel and the right tunnel of the lower-layer frame culvert, re-spraying to the designed thickness, and covering the end head of the prestressed anchor rod and the end head anchorage device of the prestressed anchor rope.
More specifically, the step S22 includes the steps of:
after the excavation and support of the left hole and the right hole of the lower-layer frame culvert are completely constructed, laying a waterproof layer of a short side wall 60 below the left hole and the right hole of the lower-layer frame culvert and burying a drain pipe underground, binding the inverted arch 41 steel bars and the short side wall 60 steel bars of the left hole and the right hole of the lower-layer frame culvert, reserving steel bars connected with the arch wall, and pouring inverted arches 41 and the short side wall 60 of the left hole and the right hole of the lower-layer frame culvert and inverted arch filling concrete 42.
More specifically, the step S23 includes the steps of:
s231: cleaning the reserved steel bars of the upper culvert 10, erecting side templates of the middle wall 50, binding the steel bars of the middle wall 50, and connecting the reserved steel bars with the reserved steel bars of the upper culvert 10;
s232: and supporting the side forms of the middle wall 50 close to the left hole and the right hole of the lower-layer framework, and pouring concrete of the partial structure.
More specifically, the step S24 includes the steps of:
s241: cleaning the reserved steel bars of the upper culvert 10, erecting side templates of the side walls 60 close to the middle culvert, binding the steel bars of the side walls 60, and connecting the reserved steel bars with the upper culvert 10;
s242: and (3) erecting side walls 60 close to side forms of the left hole and the right hole of the lower-layer frame culvert, and pouring concrete of the partial structure.
Specifically, the step S3 includes the following steps:
s31: excavating and constructing a middle tunnel 70 of the lower-layer frame culvert;
s32: and (5) constructing an inverted arch lining at the bottom of the middle hole 70 of the lower-layer frame culvert.
More specifically, the step S31 includes the steps of:
s311: excavating a middle tunnel 70 of the lower-layer frame culvert in a step weak blasting and mechanical excavation mode;
s312: and performing primary support construction of the tunnel bottom of the middle hole 70 of the lower-layer frame culvert, namely spraying concrete with the thickness of 8cm.
More specifically, the step S32 includes the steps of:
s321: cleaning reserved steel bars of inverted arches 41 of a left hole and a right hole of a lower-layer frame culvert, binding steel bars of inverted arches at the bottom of a middle hole 70 of the lower-layer frame culvert, well connecting the reserved steel bars of the inverted arches 41 of the left hole and the right hole of the lower-layer frame culvert, and erecting a mold;
s322: and (4) carrying out concrete pouring for the inverted arch 81 lining at the bottom of the middle hole 70 of the lower-layer frame culvert, and carrying out pouring for the inverted arch filling concrete 82 after initial setting.
Compared with the prior art, in the construction of the double-layer frame culvert, when the upper side wall and the bottom plate are constructed, because surrounding rocks behind the side wall and below the bottom plate are not excavated, the double-layer frame culvert can be used as a supporting wall body of the side wall template and the bottom plate template, a bracket system of the side wall template and the bottom plate template is removed, the construction difficulty of the side wall template and the bottom plate template is reduced, the labor and material cost for erecting the bracket is saved, and the safety risk of side wall construction after the side wall rock mass is excavated is eliminated. The double-deck frame culvert adopts the construction of contrary construction method, and the rescue passageway is accomplished in the construction earlier, and the progress does not receive the influence that strides the changeover portion greatly, can facilitate for the construction of follow-up rescue passageway, and on-the-spot safety control, civilized construction etc. all obtain very big improvement, and rescue passageway top prestressed anchorage cable, prestressed anchorage pole construction completion back, can provide reliable safety guarantee for the construction of lower floor.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The construction method of the double-layer orthogonal frame culvert in the underground excavation station is characterized in that the double-layer orthogonal frame culvert comprises an upper layer frame culvert and a lower layer frame culvert; the upper layer frame culvert forms a transversely arranged upper layer culvert; the lower-layer frame culvert forms a longitudinally arranged left lower-layer frame culvert, a longitudinally arranged right lower-layer frame culvert and a longitudinally arranged middle lower-layer frame culvert; the bottom of the lower-layer frame culvert is of an inverted arch structure; the construction method of the double-layer orthogonal frame culvert comprises the following steps:
s1: constructing an upper layer culvert structure;
s2: constructing left and right hole structures of the lower-layer frame culvert;
s3: and constructing a middle hole structure of the lower-layer frame culvert.
2. The construction method of a double-layered orthogonal frame culvert in an underground excavation station as claimed in claim 1,
the step S1 includes the steps of:
s11: excavating an upper layer culvert and performing support construction;
s12: constructing concrete of an upper culvert structure;
the step S2 includes the steps of:
s21: carrying out staggered excavation and supporting construction on left and right holes of a lower-layer frame culvert;
s22: staggering left and right holes of a lower-layer frame culvert for bottom inverted arch lining construction;
s23: carrying out middle wall construction on the left and right holes of the lower-layer frame culvert;
s24: constructing side walls of the left and right holes of the lower-layer frame culvert;
the step S3 includes the steps of:
s31: excavating and constructing a middle tunnel of the lower-layer frame culvert;
s32: and (5) constructing an inverted arch lining at the bottom of the middle hole of the lower-layer frame culvert.
3. The construction method of the double-layer orthogonal frame culvert in the underground excavation station as claimed in claim 2, wherein the step S11 comprises the steps of:
s111: constructing an advanced support at the top of the upper layer culvert;
s112: excavating an upper culvert by adopting an explosion mode, simultaneously carrying out primary support in time once per circulating footage, namely initially spraying concrete with the thickness of 5cm, erecting a grid steel frame, spraying concrete for the second time according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s113: applying a cartridge anchor rod of the upper culvert;
s114: after the excavation of the upper culvert is finished, applying a prestressed anchor rod and a prestressed anchor cable, tensioning to a designed tension, monitoring the stability of the tensioning stress, and then performing grouting locking;
s115: and spraying concrete with the steel bar net for the third time at the arch part of the upper culvert, re-spraying to the designed thickness, and covering the end of the prestressed anchor rod and the end anchor of the prestressed anchor rope.
4. The construction method of the double-layer orthogonal frame culvert in the underground excavation station as claimed in claim 3, wherein the step S12 comprises the steps of:
s121: fixing side forms on the side walls of the upper culvert, binding bottom plate steel bars and short side wall steel bars of the upper culvert, reserving steel bars connected with the middle wall, and pouring bottom plate and short side wall concrete;
s122: laying an arch wall waterproof layer of the upper culvert, burying a drain pipe, binding arch wall reinforcing steel bars, and pouring arch wall concrete.
5. The construction method of the double-layer orthogonal frame culvert in the underground excavated station as claimed in claim 4, wherein the step S21 comprises the steps of:
s211: after the concrete structure construction of the upper layer culvert is finished, excavating a left tunnel and a right tunnel of the lower layer frame culvert in a left-right staggered manner; the side of the middle wall is provided with an opening boundary which is 1m wider than the middle wall, so that a template can be conveniently erected during the concrete construction of the middle wall;
s212: constructing primary supports around a left hole and a right hole of a lower-layer frame culvert, namely initially spraying concrete with the thickness of 5cm, erecting a steel frame, and constructing a lock pin anchor pipe;
s213: spraying second-time concrete to the left hole and the right hole of the lower-layer frame culvert according to the design thickness requirement, covering the grid steel frame, and marking the positions of a common anchor rod, a prestressed anchor rod and a prestressed anchor cable;
s214: applying common anchor rods, prestressed anchor rods and prestressed anchor cables of a left hole and a right hole of a lower-layer frame culvert, tensioning to a designed tension, monitoring the tension stress to be stable, and then performing grouting locking;
s215: and spraying concrete for the third time to the designed thickness to cover the end of the prestressed anchor rod and the anchor at the end of the prestressed anchor cable.
6. The construction method of the double-layer orthogonal frame culvert in the underground excavation station as claimed in claim 5, wherein the step S22 comprises the steps of:
after the excavation and support of the left hole and the right hole of the lower-layer frame culvert are completely constructed, laying a short side wall waterproof layer below the left hole and the right hole of the lower-layer frame culvert and burying a drain pipe underground, binding inverted arch reinforcing steel bars and short side wall reinforcing steel bars of the left hole and the right hole of the lower-layer frame culvert, reserving connecting reinforcing steel bars with an arch wall, and pouring inverted arches, short side wall linings and inverted arch filling concrete of the left hole and the right hole of the lower-layer frame culvert.
7. The construction method of the double-layer orthogonal frame culvert in the underground excavated station as claimed in claim 6, wherein the step S23 comprises the steps of:
s231: cleaning the reserved steel bars of the upper culvert, erecting a side template of the middle wall, binding the steel bars of the middle wall, and connecting the reserved steel bars with the reserved steel bars of the upper culvert;
s232: and (5) well supporting side forms of the left hole and the right hole of the middle wall close to the lower-layer frame culvert, and pouring concrete of the partial structure.
8. The construction method of the double-layer orthogonal frame culvert in the underground excavated station as claimed in claim 7, wherein the step S24 comprises the steps of:
s241: cleaning the reserved steel bars of the upper culvert, erecting side templates of the side walls close to the middle culvert, binding the steel bars of the side walls, and connecting the reserved steel bars with the reserved steel bars of the upper culvert;
s242: and (5) erecting side forms of the side walls close to the left hole and the right hole of the lower-layer frame culvert, and pouring concrete of the partial structure.
9. The construction method of the double-layer orthogonal frame culvert in the underground excavated station as claimed in claim 8, wherein the step S31 comprises the steps of:
s311: excavating the middle tunnel of the lower-layer frame culvert in a step weak blasting and mechanical excavation mode;
s312: and performing primary support construction of the tunnel bottom of the middle hole of the lower-layer frame culvert, namely spraying concrete with the thickness of 8cm.
10. The construction method of the double-layer orthogonal frame culvert in the underground excavation station as claimed in claim 9, wherein the step S32 comprises the steps of:
s321: cleaning reserved steel bars of inverted arches of a left hole and a right hole of a culvert of the lower layer frame, binding steel bars of inverted arches at the bottom of a middle hole of the culvert of the lower layer frame, well connecting the reserved steel bars of the inverted arches of the left hole and the right hole of the culvert of the lower layer frame, and erecting a mold;
s322: and (4) pouring inverted arch lining concrete at the bottom of the middle hole of the lower-layer frame culvert, and pouring inverted arch filling concrete after initial setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010909896.0A CN112145195B (en) | 2020-09-02 | 2020-09-02 | Construction method of double-layer orthogonal frame culvert in underground excavation station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010909896.0A CN112145195B (en) | 2020-09-02 | 2020-09-02 | Construction method of double-layer orthogonal frame culvert in underground excavation station |
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| CN112145195A CN112145195A (en) | 2020-12-29 |
| CN112145195B true CN112145195B (en) | 2022-10-14 |
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| CN103104264B (en) * | 2013-01-28 | 2015-05-06 | 广东省冶金建筑设计研究院 | Urban interchange tunnel |
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