CN113153314A - Underground excavation construction method - Google Patents
Underground excavation construction method Download PDFInfo
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- CN113153314A CN113153314A CN202110434497.8A CN202110434497A CN113153314A CN 113153314 A CN113153314 A CN 113153314A CN 202110434497 A CN202110434497 A CN 202110434497A CN 113153314 A CN113153314 A CN 113153314A
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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
- 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
- E21D11/04—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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
Abstract
The embodiment of the application provides a subsurface excavation construction method. The method comprises the following steps: arranging a high channel; the high channel is a channel which is longitudinally communicated up and down along the station and the air duct and is arranged between the station and the air duct; and carrying out excavation work and structural construction by utilizing the high passage to form an air passage. By adopting the underground excavation construction method provided by the application, the upper guide hole and the lower guide hole are not arranged for air duct construction, but the high channel is arranged for air duct construction, and the construction method for air duct construction by adopting the high channel has the advantages of simplicity and convenience in construction.
Description
Technical Field
The application relates to the technical field of underground building construction, in particular to a subsurface excavation construction method.
Background
At present, the station construction can adopt an open cut method, a shallow buried and underground cut method or a shield method, wherein the open cut method and the shallow buried and underground cut method are commonly used. Subway stations are mostly built in the central zone of an urban area, and are constructed by adopting an open cut method, so that urban roads need to be closed all day long, and the problem of urban traffic congestion is increased; the underground pipelines in urban areas are dense, and the difficulty in changing and moving is high; the foundation pit construction has serious pollution to the surrounding environment, and the construction noise has great influence on the life and work of surrounding residents; the defects cause great interference on open cut method construction, long construction period and increased indirect engineering cost.
The traditional shallow excavation method relieves the problem of ground traffic pressure, namely pipeline migration, to a certain extent. The traditional shallow-buried underground excavation method generally adopts a multi-pilot hole PBA (Pile-Beam-Arc) construction method to carry out air duct construction, the multi-pilot hole PBA construction method firstly excavates small pilot holes on an upper layer and a lower layer, carries out construction of manual hole digging piles and crown beams in the pilot holes on the upper layer, then carries out primary support of Pile tops, and backfills outside concrete; constructing a strip base in the lower layer pilot tunnel; excavating and supporting an arch part to form an arch part primary support; the arch part primary support and the upper layer pilot tunnel are connected into a whole, then the excavation of the main body part of the cavern is carried out under the protection of the arch part primary support, and the construction of the main structure of the air duct is carried out from top to bottom at the same time.
Problems existing in the prior art:
a PBA construction method with multiple pilot holes is adopted to carry out air duct construction, and the construction method is too complex and has the problem of inconvenient construction.
Disclosure of Invention
The embodiment of the application provides a subsurface excavation construction method, which aims to solve the problems that the construction method in the prior art is too complex and inconvenient to implement.
According to a first aspect of embodiments of the present application, there is provided a method of underground excavation construction, the method comprising:
arranging a high channel; the high channel is a channel which is longitudinally communicated with the air channel along a station and is arranged between the station and the air channel;
and carrying out excavation work and structural construction by utilizing the high channel to form the air duct.
By adopting the underground excavation construction method provided by the embodiment of the application, the upper guide hole and the lower guide hole are not arranged for air duct construction, but the high channel is arranged for air duct construction, and the method for constructing the air duct by adopting the high channel has the advantages of simplicity and convenience in construction.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flow chart of an underground excavation construction method according to an embodiment of the present application;
fig. 2 is an application scene diagram of an underground excavation construction method according to an embodiment of the present application;
fig. 3 is a schematic flow chart of another excavation construction method according to an embodiment of the present application;
fig. 4 is a schematic flow chart of another excavation construction method provided in the embodiment of the present application;
FIG. 5 is a cross-sectional layout of a high duct and an air duct provided in an embodiment of the present application;
FIG. 6 is a cross-sectional layout view of another high duct and air duct provided in an embodiment of the present application;
fig. 7 is a schematic flow chart of another excavation construction method according to the embodiment of the present application;
FIG. 8 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
FIG. 9 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
FIG. 10 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
FIG. 11 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
FIG. 12 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
FIG. 13 is a cross-sectional layout view of yet another high duct and air duct provided in an embodiment of the present application;
fig. 14 is a schematic flow chart illustrating another excavation construction method according to an embodiment of the present application;
FIG. 15 is a bending moment diagram of the first side wall according to an embodiment of the present application.
200-high channel; 210-target side; 300-an air duct; 310-a first sidewall; 311-a crown beam; 312-a bottom support foundation; 313 — a first space; 314-a first lining arch; 315-second lining arch; 316-reinforcement interval; 317-a second side wall; 3171-a first sidewall segment; 3172-a second sidewall segment; 3173-a third side wall section; 318-first layer middle plate; 319-second tier middle plate; 320-floor arch; 321-a second space; 322-a first side wall construction space; 323-first target position; 324-a second target position; 325-a third space; 326 — second side wall construction space; 327-wind tunnel bottom position; 328-a fourth space; 329-third side wall construction space; 400-station.
Detailed Description
In the process of implementing the application, the inventor finds that the air duct construction is carried out by adopting a multi-pilot-hole PBA construction method, small pilot holes on an upper layer and a lower layer are firstly excavated, manual hole digging piles and crown beams are constructed in the upper layer pilot hole, then pile top primary support is constructed, and outside concrete is backfilled; constructing a strip base in the lower layer pilot tunnel; excavating and supporting an arch part to form an arch part primary support; the arch part primary support and the upper layer pilot tunnel are connected into a whole, then the excavation of the main body part of the cavern is carried out under the protection of the arch part primary support, and the construction of the main structure of the air duct is carried out from top to bottom at the same time. A PBA construction method with multiple pilot holes is adopted to carry out air duct construction, and the construction method is too complex and has the problem of inconvenient construction.
In view of the above problems, the embodiment of the present application provides a method for underground excavation construction, which does not set up an upper pilot tunnel and a lower pilot tunnel for air duct construction, but sets up a high channel for air duct construction, and the method for air duct construction by using a high channel has the advantages of simplicity and convenience in construction.
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1, a flow chart of an underground excavation construction method provided in an embodiment of the present application is schematically illustrated, and the underground excavation construction method may include the following steps:
s101, setting a high channel.
S103, excavating work and structural construction are carried out by utilizing the high passage to form an air duct.
As shown in fig. 2, the high-pass duct 200 is a duct that penetrates in the longitudinal direction of the station 400 and the wind tunnel 300 and is provided between the station 400 and the wind tunnel 300. The high passage 200 may be obtained by mechanical excavation, and the station 400 may include a traffic lane where a subway passes, a waiting area for waiting people, a hall for entering and exiting the station, and the like.
It should be understood that when constructing the air duct 300, the high passage 200 may be used for excavation work for earth excavation and material feeding, and the high passage 200 may also be used for providing bearing support for the structural construction of the air duct 300.
In the embodiment of the present application, the high tunnel 200 may provide a working surface for excavation and structural construction for the air duct 300 construction, and may also provide an excavation working surface for the station 400 construction. Referring to fig. 3, before step S103, the excavation construction method may further include the following steps:
and S102, excavating work is carried out by utilizing the high channel to form a station.
It should be understood that, in the early stage, the high tunnel 200 may provide an excavation working surface for the station 400 construction, and a working surface for the unearthing and feeding construction of the station 400, that is, the high tunnel 200 may be used to convey earth excavated from the station 400, and the high tunnel 200 may also be used to convey materials into the station 400. After the station 400 is constructed, the high passage 200 may also be used to provide an excavation and structural construction work surface for the air duct 300. Therefore, the utilization rate of the high channel 200 can be improved, and the construction efficiency can be improved.
In the embodiment of the present application, the principle of the excavation work using the high tunnel 200 may be: obtaining a station 400 excavation working surface by using the high channel 200; based on the excavation working surface of the station 400, the PBA construction method is adopted to perform excavation work so as to form the station 400. The PBA construction method may be an 8-pilot hole PBA construction method, and of course, a specific PBA construction method may be determined according to actual conditions, which is not limited herein.
It should be understood that when a constructor performs the construction of the station 400, the PBA method is used for the excavation work, the soil generated during the excavation work can be transported through the high passageway 200, and the materials required for the excavation work can also be transported through the high passageway 200.
In order to facilitate understanding of how to perform excavation work and structural construction using the high tunnel 200, referring to fig. 4, which is a flow diagram of the substeps of S103, S103 includes the following substeps:
s103a, arranging a first side wall and a crown beam on the target side of the high channel.
The target side 210 is a side of the high aisle 200 adjacent to the station 400, and referring to fig. 2, the target side 210 is a side of the high aisle 200 close to the station 400.
It should be appreciated that the first sidewall 310 provided in the high tunnel 200 may replace a manual hole digging pile, thereby solving the problem of poor safety of manual hole digging.
Referring to fig. 5, a schematic view of a first sidewall 310 and a crown 311 are disposed on the target side 210 of the high channel 200. The first side wall 310 is firstly constructed on the target side 210 of the high-pass 200 in a segmented manner from bottom to top, and after the concrete of the first side wall 310 reaches the design strength, the crown beam 311 is constructed on the top of the first side wall 310.
Referring to fig. 5, before the first side wall 310 and the crown beam 311 are installed, a bottom supporting foundation 312 may be applied to the bottom of the target side 210, and after the concrete of the bottom supporting foundation 312 reaches the designed strength, the first side wall 310 and the crown beam 311 are sequentially applied along the bottom supporting foundation 312 to the top of the target side 210. In other words, after the concrete of the bottom supporting foundation 312 reaches the designed strength, the first side wall 310 is first constructed along the bottom supporting foundation 312 to the top of the target side 210 in a segmented manner from bottom to top, and after the concrete of the first side wall 310 reaches the designed strength, the crown beam 311 is then constructed on the top of the first side wall 310.
The bottom supporting base 312 may be understood as a strip-shaped base, and the bottom supporting base 312 may be used to provide a force supporting base for the first sidewall 310. The bottom support foundation 312 may be applied in bins within the upper channel 200.
S103b, excavating the soil body under the lining arch between the crown beam and the top of the high passage to obtain a first space.
Referring to fig. 6, the first space 313 may be understood as a space formed by excavating soil along the crown beam 311 and the top of the high tunnel 200 and away from the target side 210.
S103c, respectively forming a first lining arch and a second lining arch on the top of the first space.
With reference to fig. 6, a first lining arch 314 is first constructed on the top of the first space 313 to form a top arch preliminary support; and then, casting along the bottom direction to form a second lining arch 315. Wherein one end of first lining arch 314 is arranged on crown spar 311, i.e. crown spar 311 provides a point of attack for first lining arch 314.
With continued reference to fig. 6, before excavating the soil below the lining arch, concrete is backfilled in the reinforced area 316 formed by the crown beam 311, the top of the high channel 200 and the first lining arch 314. Wherein, the reinforced section 316 can be backfilled with C20 concrete. The backfilling of concrete in the reinforced section 316 prevents deformation of the soil at the top of the high tunnel 200.
S103d, soil body excavation is carried out layer by layer from the bottom of the first space to the bottom of the air duct along the longitudinal direction of the high duct, and a second side wall, a multi-layer middle plate and a bottom plate bottom arch are generated to form the air duct.
It should be understood that the first lining arch 314, the second lining arch 315, the second side walls 317, the multi-level midplane, and the floor bottom arch 320 are the main structure of the air chute 300. The number of layers of the multilayer middle plate may be set according to actual situations, and is not limited herein.
For the convenience of understanding, the present application will be described with the number of layers of the multilayer middle plate being 2 as an example. The multi-layer middle plate includes a first layer middle plate 318 and a second layer middle plate 319, and the second side wall 317 includes a first side wall segment 3171, a second side wall segment 3172, and a third side wall segment 3173. It is understood that the second sidewall 317 is also formed in segments, the second sidewall 317 of the present application is formed in three segments, and the first sidewall segment 3171, the second sidewall segment 3172 and the third sidewall segment 3173 form the second sidewall 317.
Referring to fig. 7, in order to illustrate the sub-step flow of S103d, S103d includes the following sub-steps:
s103d1, soil body excavation work is carried out from the bottom of the first space to the first target position along the longitudinal direction of the high passageway, and a second space and a first side wall construction space are obtained.
Wherein, the first target position 323 is a position at a first preset depth from the bottom of the first space 313 along the longitudinal direction of the high channel 200; the first sidewall construction space 322 is a space adjacent to the first sidewall 310 and having a width equal to the thickness between the first lining arch 314 and the second lining arch 315; the second space 321 has a width equal to the horizontal width of the second lining arch 315.
Referring to fig. 8, after the concrete of the first lining arch 314 and the second lining arch 315 reaches a predetermined strength, soil is excavated to a first target position 323 along the longitudinal direction of the high tunnel 200, so as to obtain a second space 321 and a first sidewall construction space 322.
The soil excavation from the bottom of the first space 313 to the first target position 323 can adopt the principle of longitudinal segmentation, so that the time-space effect of the soil can be fully used, the deformation of the first lining arch 314, the second lining arch 315 and the soil can be reduced, the bearing capacity of the bottom soil layer can be ensured, and the adverse effect of differential settlement on the main structure of the air duct 300 can be reduced.
By adopting the principle of longitudinal segmentation, the principle of performing soil excavation work from the bottom of the first space 313 to the first target position 323 can be as follows: dividing the bottom of the first space 313 to the first target position 323 into a plurality of construction segments; and excavating the soil body to the first target position 323 in each construction section layer by layer.
And S103d2, constructing a first side wall section in the first side wall construction space.
S103d3, forming a first-layer middle plate at the bottom of the second space.
Referring to fig. 9, a first side wall segment 3171 may be formed in the first side wall construction space 322, and after the strength of the concrete of the first side wall segment 3171 reaches a predetermined strength, a first middle plate 318 may be formed at the bottom of the second space 321, wherein one end of the first middle plate 318 is connected to one end of the first side wall segment 3171.
And S103d4, performing soil body excavation work from the bottom of the second space and the bottom of the first side wall construction space to a second target position along the longitudinal direction of the high passageway to obtain a third space and a second side wall construction space.
Wherein the second target position 324 is a position at a second preset depth from the bottom of the second space 321 and the first sidewall construction space 322 along the longitudinal direction of the high passageway 200; the second sidewall construction space 326 is a space adjacent to the first sidewall 310 and having a width equal to the width of the first sidewall construction space 322; the third space 325 is a space having a width equal to the width of the second space 321.
Referring to fig. 10, after the concrete in the first-layer middle plate 318 reaches a predetermined strength, soil is excavated to a second target position 324 along the longitudinal direction of the high channel 200, so as to obtain a third space 325 and a second side wall construction space 326.
The soil excavation work performed from the bottom of the second space 321, the bottom of the first sidewall construction space 322 to the second target position 324 can adopt a longitudinal segmentation principle, so that the time-space effect of the soil can be fully used, the deformation of the first-layer middle plate 318 and the soil can be reduced, the bearing capacity of the bottom soil layer can be ensured, and the adverse effect of differential settlement on the main structure of the air duct 300 can be reduced.
By adopting the principle of longitudinal segmentation, the principle of performing soil excavation work from the bottom of the second space 321 and the bottom of the first side wall construction space 322 to the second target position 324 may be as follows: dividing the bottom of the second space 321 and the bottom of the first sidewall construction space 322 to a second target location 324 into a plurality of construction sections; the earth is excavated in layers at each construction section to a second target location 324.
And S103d5, constructing a second side wall section in the second side wall construction space.
S103d6, forming a second-layer middle plate at the bottom of the third space.
Referring to fig. 11, a second side wall segment 3172 may be formed in the second side wall construction space 326, and after the strength of the concrete of the second side wall segment 3172 reaches a predetermined strength, a second middle plate 319 is formed at the bottom of the third space 325, and one end of the second middle plate 319 is connected to one end of the second side wall segment 3172.
And S103d7, performing soil excavation work from the bottom of the third space, the bottom of the second side wall construction space to the bottom of the air duct along the longitudinal direction of the high duct to obtain a fourth space and a third side wall construction space.
The third side wall construction space 329 is a space adjacent to the first side wall 310 and having a width equal to the width of the second side wall construction space 326; the fourth space 328 is a space having a width equal to the width of the third space 325.
Referring to fig. 12, after the concrete in the middle plate 319 of the second layer reaches a predetermined strength, soil is excavated to the bottom position 327 of the air duct along the longitudinal direction of the high channel 200, so as to obtain a fourth space 328 and a third side wall construction space 329.
The soil excavation work from the bottom of the third space 325 and the bottom of the second side wall construction space 326 to the air duct bottom position 327 can adopt the principle of longitudinal segmentation, the time-space effect of the soil can be fully used, the deformation of the middle plate 319 and the soil in the second layer can be reduced, the bearing capacity of the bottom soil layer can be ensured, and the adverse effect of differential settlement on the main structure of the air duct 300 can be reduced.
By adopting the principle of longitudinal segmentation, the principle of performing soil excavation work from the bottom of the third space 325 and the bottom of the second side wall construction space 326 to the position 327 of the bottom of the air duct may be as follows: dividing the bottom of the third space 325 and the bottom of the second sidewall construction space 326 to the air duct bottom position 327 into a plurality of construction sections; the soil is excavated in layers at each construction section to the tunnel bottom position 327.
And S103d8, constructing a third side wall section in the third side wall construction space.
And S103d9, constructing a bottom plate bottom arch at the bottom of the fourth space.
Referring to fig. 13, a third side wall segment 3173 may be formed in the third side wall construction space 329, and after the strength of concrete of the third side wall segment 3173 reaches a predetermined strength, a bottom plate arch 320 may be formed at the bottom of the fourth space 328, and one end of the bottom plate arch 320 is connected to one end of the third side wall segment 3173. And the end where the floor arches 320 and the third sidewall segment 3173 join is disposed on the bottom support foundation 312.
The second side wall 317 should be waterproofed according to the requirements of the waterproof technical code of underground engineering. And when the first side wall construction space 322, the second side wall construction space 326 and the third side wall construction space 329 are obtained, roughening and high-pressure flushing can be performed according to the requirements of the relevant construction specifications of the concrete structure engineering construction specifications. The first 3171, second 3172 and third 3173 sidewall segments should be accurately connected and tied to each other by steel bars according to the requirements of construction specifications, and the concrete is poured while being vibrated to ensure that the first 3171, second 3172 and third 3173 sidewall segments are tightly combined to form the second sidewall 317.
The soil excavation work can be performed by adopting machinery, and when the soil is excavated by adopting machinery, in order to improve the precision, when the soil is excavated to the preset thickness from the position 327 on the bottom of the air channel, manual bottom cleaning is performed. It can be understood that when the distance from the bottom of the air duct 300 to the preset thickness is reached, the mechanical excavation is stopped, and the depth precision of the air duct 300 can be ensured by adopting manual excavation. Wherein the preset thickness may be set to 300 mm.
Referring to fig. 14, before the step of performing excavation work and structural construction using the high tunnel 200 to form the air duct 300, the underground excavation construction method further includes the steps of:
and S104, calculating load information of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate arch according to the upper covering soil at the cross section of the air duct.
The load information may include vertical component and horizontal component of loads such as water, soil, overload, civil air defense, earthquake and the like.
And S105, inputting the load information of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch into a preset load-structure model, and calculating to obtain the internal force of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch.
It should be understood that the load-structure model can be used to characterize the effect of the ground layer on the first side wall 310, the first lining arch 314, the second lining arch 315, the second side wall 317, the multi-layer middle plate and the bottom plate bottom arch 320, and only generate the load of the active ground pressure and the passive ground resistance acting on the underground building structure, and the lining generates the corresponding calculation method of the internal force and deformation under the effect of the load. Internal force analysis can be performed through a general program of finite element structure analysis according to load information of the first side wall 310, the first lining arch 314, the second lining arch 315, the second side wall 317, the multilayer middle plate and the bottom plate bottom arch 320, so as to obtain internal forces of the first side wall 310, the first lining arch 314, the second lining arch 315, the second side wall 317, the multilayer middle plate and the bottom plate bottom arch 320. Finite element structural analysis is understood to mean that a mathematical approximation method is used to simulate a real physical system (i.e., geometry and load conditions), and a finite number of unknowns can be used to approximate a real system of wireless unknowns using simple and interactive elements. A simple yet interactive unit may employ a longitudinal 1m area of the duct 300 during the construction phase.
The internal force can be represented by a bending moment M, an axial force N, and a shearing force Q. Referring to FIG. 15, it is a bending moment diagram of the first side wall 310 at different construction stages, wherein the bending moment diagram may be a curve representing different section bending moments of the member. Fig. 15 a is a bending moment diagram of the first sidewall 310 when the first lining arch 314 and the second lining arch 315 are constructed; b is a bending moment diagram of the first sidewall 310 when the first sidewall segment 3171 and the first floor slab 318 are constructed; c is a bending moment diagram of the first sidewall 310 when the second sidewall segment 3172 and the second floor middle plate 319 are constructed; d is a bending moment diagram of the first side wall 310 when the third side wall segment 3173 and the floor arch 320 are constructed. The bending moment diagrams of the first side wall 310 at different construction stages are different, which indicates that the internal force exerted on the first side wall 310 at different construction stages is different, and in order to ensure that the first side wall 310 can not deform during the whole construction stage, the internal force of the first side wall 310 is selected from the internal forces at different construction stages to have the maximum value.
Similarly, the internal forces of the first lining arch 314, the second lining arch 315, the second sidewall 317, the multi-level midplane, and the floor bottom arch 320 should also be selected to be at a maximum from the internal forces in the different construction stages.
And S106, setting composition parameters of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch according to the internal force of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch.
It should be understood that the composition parameters may include composition material and structural thickness, the composition material may include concrete type, and rebar size, among others. The structural thickness may be the thickness of the first sidewall 310, the thickness of the first liner arch 314, the thickness of the second liner arch 315, the thickness of the second sidewall 317, the thickness of the multi-layer mid-plane, the thickness of the floor pan bottom arch 320.
In summary, the present application provides a method of underground excavation, the method comprising: arranging a high channel; the high channel is a channel which is longitudinally communicated up and down along the station and the air duct and is arranged between the station and the air duct; and carrying out excavation work and structural construction by utilizing the high passage to form an air passage. According to the underground excavation construction method provided by the embodiment of the application, the upper guide hole and the lower guide hole are not arranged for air duct construction, but the high channel is arranged for air duct construction, and the construction method for air duct construction by adopting the high channel has the advantages of simplicity and convenience in construction.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An underground excavation construction method, characterized in that the method comprises:
arranging a high channel; the high channel is a channel which is longitudinally communicated with the air channel along a station and is arranged between the station and the air channel;
and carrying out excavation work and structural construction by utilizing the high channel to form the air duct.
2. The method of claim 1, wherein prior to the step of utilizing the elevated passageway for excavation and construction to form the air chute, the method further comprises
And carrying out excavation work by utilizing the high channel to form the station.
3. The method of claim 2, wherein the step of performing excavation work using the high tunnel to form the station comprises:
obtaining a station excavation working surface by using the high channel;
and based on the station excavation working surface, adopting a pile beam arch PBA construction method to perform excavation work so as to form the station.
4. The method of claim 3, wherein the PBA construction method is an 8-hole PBA construction method.
5. The method of any one of claims 1 to 4, wherein the step of performing excavation and construction using the high channel to form the air duct comprises:
arranging a first side wall and a crown beam on the target side of the high channel; wherein the target side is the side of the high passage adjacent to the station;
excavating a soil body at the lower part of the lining arch in the interval between the crown beam and the top of the high passage to obtain a first space;
respectively constructing a first lining arch and a second lining arch at the top of the first space;
and carrying out soil excavation from the bottom of the first space to the bottom of the air duct in a layering manner along the longitudinal direction of the high air duct to generate a second side wall, a multilayer middle plate and a bottom plate arch so as to form the air duct.
6. The method of claim 5, wherein prior to the step of providing the first sidewall and the crown beam on the target side of the high passage, the method further comprises:
constructing a bottom supporting foundation at the bottom of the target side;
the step of arranging the first side wall and the crown beam on the target side of the high channel comprises the following steps:
and sequentially constructing the first side wall and the crown beam from the bottom supporting foundation to the top of the target side.
7. The method of claim 5, wherein the multi-layer midplane comprises a first layer midplane and a second layer midplane, the second side wall comprising a first side wall segment, a second side wall segment, and a third side wall segment;
the step of carrying out soil body excavation work from the bottom of the first space to the bottom of the air duct in a layering mode along the longitudinal direction of the high air duct, and generating a second side wall, a multilayer middle plate and a bottom plate bottom arch comprises the following steps:
soil excavation work is carried out from the bottom of the first space to a first target position along the longitudinal direction of the high passage to obtain a second space and a first side wall construction space; the first target position is a position which is longitudinally along the high channel and is a first preset depth from the bottom of the first space; the first side wall construction space is a space which is close to the first side wall and has the width of the thickness between the first lining arch and the second lining arch; the second space is the horizontal width of the second lining arch;
constructing the first side wall section in the first side wall construction space;
constructing the middle plate of the first layer at the bottom of the second space;
soil excavation work is carried out on the bottom of the second space and the bottom of the first side wall construction space to a second target position along the longitudinal direction of the high passage, so that a third space and a second side wall construction space are obtained; the second target position is a position which is longitudinally along the high passage and is at a second preset depth from the second space and the bottom of the first side wall construction space; the second side wall construction space is a space which is close to the first side wall and has the width of the first side wall construction space; the third space is a space with the width of the second space;
constructing the second side wall section in the second side wall construction space;
constructing the second-layer middle plate at the bottom of the third space;
soil excavation work is carried out from the bottom of the third space and the bottom of the second side wall construction space to the bottom of the air duct along the longitudinal direction of the high passageway, so that a fourth space and a third side wall construction space are obtained; the third side wall construction space is a space which is close to the first side wall and has the width of the second side wall construction space; the fourth space is a space with the width of the third space;
constructing the third side wall section in the third side wall construction space;
and constructing the bottom plate bottom arch at the bottom of the fourth space.
8. The method of claim 5, wherein prior to the step of performing an excavation of the underlying soil mass between the crown beam and the top of the upper passageway to obtain the first space, the method further comprises:
and backfilling concrete in a reinforcing interval formed by the crown beam, the top of the high passage and the first lining arch.
9. The method of claim 7, wherein the step of performing a soil excavation work on the bottom of the first space to a first target position along the longitudinal direction of the high passageway to obtain a second space and a first side wall construction space comprises:
dividing the bottom of the first space to a first target position into a plurality of construction sections;
and excavating soil body to the first target position in each construction section layer by layer.
10. The method of claim 5, wherein prior to the step of providing the first sidewall and the crown beam on the target side of the high passage, the method further comprises:
calculating load information of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch according to the overlying soil at the cross section of the air duct;
inputting the load information of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch to a preset load-structure model, and calculating to obtain the internal force of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch;
and according to the internal force of the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch, carrying out composition parameter setting on the first side wall, the first lining arch, the second side wall, the multilayer middle plate and the bottom plate bottom arch.
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