CN208456633U - Tunnel arch wall preliminary bracing invades limit and changes arch construction gib system - Google Patents
Tunnel arch wall preliminary bracing invades limit and changes arch construction gib system Download PDFInfo
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- CN208456633U CN208456633U CN201821090142.1U CN201821090142U CN208456633U CN 208456633 U CN208456633 U CN 208456633U CN 201821090142 U CN201821090142 U CN 201821090142U CN 208456633 U CN208456633 U CN 208456633U
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Abstract
Limit is invaded the utility model discloses a kind of tunnel arch wall preliminary bracing and changes arch construction gib system, is located at side bottom in the body of tunnel top hole including being laid in the interim inverted arch that need to be changed in arch section and multiple gantry type support constructions laid from front to back, interim inverted arch；The arch that needs to change that need to be changed in arch section in addition to arch is replaced in starting is that need to support steel arch-shelf, every Pin need to support steel arch-shelf to pass through a gantry type support construction support, interim inverted arch includes multiple interim inverted arch brackets and longitudinal connection structure, and each gantry type support construction includes a gate type support frame and is laid in the support component on same tunnel cross section with gate type support frame.The structure design of the utility model is reasonable, easy construction and using effect are good, based on interim inverted arch and use gantry type support construction, structural integrity is strong, basis is firm, it can effectively solve the problems such as tunnel changes the inclination of arch steelframe, collapses, it is safe and reliable to change arch work progress, and does not influence Tunnel Construction Schedule.
Description
Technical field
The utility model belongs to technical field of tunnel construction, invades limit more particularly, to a kind of tunnel arch wall preliminary bracing and changes arch
Construction gib system.
Background technique
With the fast development of high-speed railway, highway capacity requires to continue to increase, the special tunnel of two-wire big cross section visitor, three vehicles
Road, four-lane highway large cross-section tunnel are commonplace.
Tunnel Engineering is still generally drill bursting construction at present, using New Austrian Tunneling Method principle: the bearing capacity of country rock itself is utilized,
Weak surrounding rock applies steelframe (also referred to as steel arch-shelf or arch) support after excavating, anchor, net, the flexible preliminary bracing limitation country rock of spray become
Shape, i.e. Tunnel structure；After surrouding rock deformation convergence, then row applies secondary lining.Tunnel support structure and later period branch
Protection structure (i.e. Tunnel Second Lining) forms composite lining of tunnel structure.For narrow-bore tunnel, large cross-section tunnel
Construction is easier to cause preliminary bracing to invade limit, and features as poor geologic condition, construction operation be lack of standardization, construction technology or construction organization are unreasonable
Etc. factors cause preliminary bracing vault sinking, abutment wall convergence, arch deformation intrusion secondary lining range.To ensure tunnel double-lining knot
The arch that needs to change that Tunnel must just be invaded limit section by structure thickness removes replacement, and also referred to as tunnel arch wall preliminary bracing is invaded
Limit changes arch construction.Tunnel invades limit section (also referred to as limit section is invaded in tunnel arch wall preliminary bracing) and refers to Tunnel knot
Structure deforms and invades the tunnel construction sections (also referred to as tunnel segment) of the locating construction section of Tunnel Second Lining, referred to as invades limit section.
Traditional arch dismounting replacement way that needs to change is off excavation operation, closes face, limits section arch base to invading
Plinth does the perpendicular support of backing plate erection or diagonal brace using steel plate and needs to change arch to support, and arch striking after slip casting is digged and installed new
Arch, last combined bolting and shotcrete.Such tradition changes arch method while influencing tunnel excavation construction speed, however it remains safety is hidden
Suffer from, there are certain defects: if the vertical, horizontal of the perpendicular support of single-point or diagonal brace does not connect, built on the sand, dismantling concrete uses more on basis
Impact grinding hammer, it is easy to because vertical or oblique fulcrum unbalance stress causes arch inclination to be collapsed；It will cause " to close the door " when serious
Accident.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiency of the prior art, provide a kind of tunnel
Arch wall preliminary bracing invades limit and changes arch construction gib system, reasonable in design, easy construction and using effect is good, to face
When inverted arch based on and use gantry type support construction, structural integrity is strong, and basis is firm, can effectively solve tunnel and changes arch steelframe
It is safe and reliable to change arch work progress, and does not influence Tunnel Construction Schedule for the problems such as tilting, collapsing.
In order to solve the above technical problems, the technical solution adopted in the utility model is: a kind of tunnel arch wall preliminary bracing is invaded
Limit change arch construction gib system, it is characterised in that: including be laid in need to change arch section in interim inverted arch and it is multiple by it is preceding extremely
It is laid on the interim inverted arch afterwards and to the gantry type support construction for needing to change arch and being supported, the arch section that need to change is tunnel
The tunnel construction sections that the intracorporal Tunnel structure in road top hole has constructed completion and tunnel lower part hole body does not excavate；It is described interim
Inverted arch is laid along tunnel longitudinal extension, and the interim inverted arch is located at side bottom in the body of tunnel top hole；It is described to need to change arch
Frame is the steel arch-shelf for carrying out supporting in the Tunnel structure to the arch wall of tunnel top hole body, described to change in arch section
All steel arch-shelfs in the Tunnel structure are to need to change arch；Arch is changed for starting in described one end that need to change arch section
End, it is described need to change arch section near it is described starting change needed to change described in a Pin of arch abutment arch for starting replacement arch, it is described
All arches that need to change that need to be changed in arch section in addition to the starting replacement arch are that need to support steel arch-shelf；It needs to prop up described in every Pin
Support steel arch-shelf passes through the gantry type support construction and is supported, and support steel arch-shelf is needed to carry out with to it described in every Pin
The gantry type support construction of support is laid on same tunnel cross section；It is described to change arch section as need to be into institute's construction tunnel
Row change arch tunnel construction sections and its by invade limit section and two be located at invade limit section front and rear sides extended segment be formed by connecting, it is described to invade
Limit section deforms for the intracorporal Tunnel structure in tunnel top hole and invades the tunnel construction sections of limit, and two extended segments are
The adjacent and interconnected tunnel construction sections of section are limited with described invade in institute's construction tunnel, it is described in two extended segments to need to change arch
Quantity be no less than 3 Pin；
The interim inverted arch includes multiple interim inverted arch brackets laid from the front to the back along tunnel longitudinal extension and will
Multiple interim inverted arch brackets are fastenedly connected the longitudinal connection structure being integrated, and the longitudinal connection structure includes that multiple tracks edge is faced
When inverted arch bracket the longitudinal connecting member laid from left to right of length direction, the longitudinal connecting member is along tunnel longitudinal extension
It lays, longitudinal connecting member described in per pass is fastenedly connected with multiple interim inverted arch brackets；The interim inverted arch bracket is cloth
The arch support of side bottom in the body of tunnel top hole is needed to change described in every Pin and is provided with described in one immediately below arch
Interim inverted arch bracket, arch is needed to change described in every Pin, and to be laid in same tunnel with the interim inverted arch bracket being located at immediately below it horizontal
On section and the two form a closed support frame, the left and right ends of each interim inverted arch bracket respectively be located at its just
The left and right sides lower part for needing to change arch of top is fastenedly connected；It is provided with described in one in each closed support frame
Gantry type support construction, in each closed support frame need to change arch and interim inverted arch bracket passes through the door frame
Formula support construction, which is fastenedly connected, to be integrated；
Each gantry type support construction include one be fixed on interim inverted arch bracket and to need to change arch into
The gate type support frame and be laid in the support component on same tunnel cross section, the support component with gate type support frame that row supports
It is laid on gate type support frame；The gate type support frame be located at interim inverted arch bracket in the same closed support frame with
It needs to change between arch, the gate type support frame and needs to change to be fastenedly connected between arch by the support component and be integrated,
The support component includes being supported on the left of gate type support frame and needing to change Left-side support part between arch left lower, support
On the right side of gate type support frame and needs to change right side supporting piece and Duo Gen between arch lower right side and be supported in gate-type from left to right
At the top of support frame and need to change the top support between arch, the Left-side support part, right side supporting piece and top support
It is laid on same plane.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: two extended segments
Needing to change the quantity of arch described in interior is 3 Pin.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the interim inverted arch branch
Frame is supported in the tunnel lower part that need to be changed in arch section and does not excavate on rock mass, and the interim inverted arch further includes not opening in tunnel lower part
The inverted arch concrete pouring structure of pouring molding on rock mass is dug, the inverted arch concrete pouring structure is located at gantry type support
Below structure；The interim inverted arch bracket and the longitudinal connection structure are poured in inverted arch concrete pouring structure.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: institute's construction tunnel is big
Bore tunnel；The interim inverted arch bracket is the arch support that the left and right sides is gradually bent upwards.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the interim inverted arch branch
Frame is shape steel bracket, the both ends of the interim inverted arch bracket and needs to change between arch plug and is filled with billet, the billet
With interim inverted arch bracket and need to change arch and be welded and fixed and be integrated.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the interim inverted arch branch
Frame is bent by an I-steel.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the gate type support frame
For by the assembled molding support frame of more fashioned iron rod pieces, the Left-side support part, right side supporting piece and top support are type
Steel rod elements, the Left-side support part, right side supporting piece and top support and gate type support frame and need to change between arch with
Welding manner is fixedly connected.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the longitudinal connecting member
For longitudinally connected fashioned iron；The longitudinal connection structure further includes the longitudinally connected reinforcing bar of multiple groups, longitudinally connected type described in adjacent twice
Longitudinally connected reinforcing bar described in being laid with one group between steel, longitudinally connected reinforcing bar described in every group include that multiple tracks is laid from left to right
Longitudinally connected reinforcing bar, the longitudinally connected reinforcing bar lays along tunnel longitudinal extension, and longitudinally connected reinforcing bar described in per pass is equal
It is fastenedly connected with multiple interim inverted arch brackets.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: needing to change described in every Pin
The left and right sides lower part of arch is laid with a support bracket, and two support brackets on arch are needed to change described in every Pin
It is symmetrically laid in above interim inverted arch bracket and the two is respectively positioned on and needs to change on the inside of arch, the left and right ends of interim inverted arch bracket
With need to change arch left and right sides lower part between be fastenedly connected by a support bracket；It is described to need to change arch
Frame is grid steel frame, and each support bracket includes that multiple tracks is connected in parallel to interim inverted arch bracket and needs to change between arch
Spiral, the spiral tilts gradually downward from outside to inside, and spiral described in multiple tracks is from top to bottom laid and it
It is laid on same plane with the arch that needs to change being connect.
Above-mentioned tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterized in that: the gate type support frame
It is arranged vertically, arch, gate type support frame and the interim inverted arch bracket of needing to change is laid on same vertical plane；It is described
Gate type support frame include lower beam, the upper beam right above lower beam, more be supported in lower beam and upper cross from left to right
The vertical supports of vertical strut and two symmetric supports lower section at left and right sides of lower beam between beam, the length of the lower beam
Greater than the length of upper beam, the upper beam and lower beam are respectively positioned on the surface of interim inverted arch bracket；Two vertical branch
Clear distance between frame is not less than 4.5m, and the clear distance between the lower beam and interim inverted arch mid-stent is not less than 4.5m.
Compared with the prior art, the utility model has the following advantages:
1, simple structure and reasonable design and easy construction, investment construction cost are lower.
2, used interim inverted arch is reasonable in design, easy construction and can provide a solid, firm branch support group
Plinth, interim inverted arch include and need to change interim inverted arch bracket that arch is correspondingly arranged, all interim inverted arch brackets are connected as one
It the longitudinal connection structure of body and is supported in tunnel lower part and does not excavate inverted arch concrete pouring structure on rock mass, interim inverted arch bracket
With invade limit arch composition gate type support frame and can make need to change the Tunnel features simple structure of arch section inner tunnel top hole body, quickly
Closing cyclization, longitudinal connection structure and interim inverted arch bracket are poured in inverted arch concrete pouring structure, and structural integrity is strong,
It is firm to support.
4, the gantry type support construction being made of gate type support frame and support component is correspondingly arranged with arch is needed to change, to face
When inverted arch based on and be supported using gantry type support construction, thoroughly solve tunnel change arch steelframe inclination collapse it is equal safely
Hidden danger.
5, gantry type support construction can be used as operation platform, and convenient operating personnel carries out changing arch by Pin.
6, change in arch work progress that traffic is unaffected in hole, face each process can normal operation, do not influence tunnel and apply
Work progress.
7, it changes that arch easy construction, using effect are good and practical value is high, changes before arch using interim inverted arch and gantry type support
Structure connection is supported reinforcing to tunnel, and support is firm, and construction safety can be effectively ensured；Also, it is basic to change arch operation process
Face normal construction is not influenced, and there is easy construction, do not influence the distinguishing features such as tunnel normal construction progress, safe and reliable.
The utility model proposes a kind of completely new large cross-section tunnels to change arch construction method, using interim inverted arch and gantry type support construction group
At change structural support, have safety coefficient is high, easy to operate, front face can normally excavation construction, do not influence work
The distinguishing features such as phase；In addition, invading preliminary bracing in limit usually tunnel top hole body due to tunnel arch wall preliminary bracing invades limit sternly
Weight, the used structural support that changes is the intracorporal support construction in tunnel top hole, and tunnel changes arch work progress only on tunnel
It is carried out in the body of portion hole, can significantly save and change arch construction cost, simplified and change arch work progress, save the duration, and tunnel changes arch
Work progress carries out before tunnel lower part hole body excavation, Tunnel not yet full-face tunneling at this time, thus changes structural support
It supports firm performance to be further guaranteed, and changes arch work progress and be easier to carry out, while tunnel arch wall supporting is stronger,
More effectively in safety for tunnel engineering, it is particularly suitable for large cross-section tunnel and changes arch construction.Meanwhile change arch work progress it is safe and reliable,
In steel arch-shelf replacement process, each gantry type support construction moves back one by one and the replacement steel arch-shelf adjacent to rear side carries out continuing branch
Support can be effectively ensured all gantry type support constructions during changing arch and be in effective holding state, ensure tunnel to the full extent
Supporting effect effectively overcomes the defect that tradition changes arch construction method.
In conclusion the structure design of the utility model is reasonable, easy construction and using effect are good, based on interim inverted arch
And gantry type support construction is used, structural integrity is strong, and basis is firm, can effectively solve tunnel and changes arch steelframe and tilts, collapses
It is safe and reliable to change arch work progress, and does not influence Tunnel Construction Schedule for problem.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the holding state schematic diagram of the utility model interim inverted arch bracket and gantry type support construction.
Fig. 2 is the structural schematic diagram of the utility model interim inverted arch bracket and gantry type support construction.
Fig. 3 is the planar structure schematic diagram of the interim inverted arch of the utility model.
Fig. 4 is the holding state schematic diagram that the utility model supports bracket.
Description of symbols:
1-tunnel top hole body；2-interim inverted arch brackets；3-gate type support framves；
3-1-lower beam；3-2-upper beam；3-3-vertical supports；
The vertical strut of 3-4-；4-need to change arch；5-Left-side support parts；
6-right side supporting pieces；7-top supports；
Rock mass is not excavated in 8-tunnels lower part；9-billets；
10-inverted arch concrete pouring structures；11-support brackets；12-longitudinally connected fashioned iron；
13-longitudinally connected reinforcing bars；14-arch springing concrete pouring structures；
15-lock foot anchoring stocks.
Specific embodiment
As shown in Figure 1, Figure 2 and Figure 3, the utility model includes being laid in the interim inverted arch and multiple by preceding that need to be changed in arch section
It is laid in after on the interim inverted arch and to the gantry type support construction for needing to change arch 4 and being supported, it is described to change arch section
Completion has been constructed for the Tunnel structure in tunnel top hole body 1 and tunnel construction sections that tunnel lower part hole body does not excavate；Institute
It states interim inverted arch to lay along tunnel longitudinal extension, the interim inverted arch is located at 1 inside bottom of tunnel top hole body；The need
Replacing arch 4 is the steel arch-shelf for carrying out supporting in the Tunnel structure to the arch wall of tunnel top hole body 1, described
All steel arch-shelfs that need to be changed in arch section in the Tunnel structure are to need to change arch 4；It is described to change the one of arch section
Arch abutment is changed for starting in end, it is described need to change to change in arch section near the starting arch 4 is needed to change described in a Pin of arch abutment as starting
Arch is replaced, all arches 4 that need to change that need to be changed in arch section in addition to the starting replacement arch are that need to support steel arch
Frame；It needs support steel arch-shelf to pass through the gantry type support construction described in every Pin to be supported, needs supporting steel described in every Pin
Arch is laid on same tunnel cross section with the gantry type support construction supported；It is described need to change arch section be
Needed in institute's construction tunnel the tunnel construction sections for carrying out changing arch and its by invade limit section and two be located at invade limit section front and rear sides extension
Section is formed by connecting, and the limit section of invading is that the Tunnel structure in tunnel top hole body 1 deforms and invades the tunnel of limit
Section, two extended segments are to invade the adjacent and interconnected tunnel construction sections of limit section with described in institute's construction tunnel, described in two
The quantity for needing to change arch 4 is no less than 3 Pin in extended segment；
The interim inverted arch includes multiple interim inverted arch brackets 2 laid from the front to the back along tunnel longitudinal extension and will
Multiple interim inverted arch brackets 2 are fastenedly connected the longitudinal connection structure being integrated, and the longitudinal connection structure includes multiple tracks edge
The longitudinal connecting member that the length direction of interim inverted arch bracket 2 is laid from left to right, the longitudinal connecting member longitudinally extend along tunnel
Direction is laid, and longitudinal connecting member described in per pass is fastenedly connected with multiple interim inverted arch brackets 2；The interim inverted arch bracket
2 be the arch support for being laid in 1 inside bottom of tunnel top hole body, and the underface that arch 4 is needed to change described in every Pin is provided with
One interim inverted arch bracket 2 needs to change arch 4 described in every Pin and lays with the interim inverted arch bracket 2 being located at immediately below it
In on same tunnel cross section and the two form a closed support frame, the left and right ends of each interim inverted arch bracket 2
It is fastenedly connected respectively with the left and right sides lower part for needing to change arch 4 being located at right above it；In each closed support frame
It is provided with the gantry type support construction, needs to change arch 4 and interim inverted arch in each closed support frame
Bracket 2 is fastenedly connected by the gantry type support construction and is integrated；
Each gantry type support construction includes one and is fixed on interim inverted arch bracket 2 and to needing to change arch 4
The gate type support frame 3 that is supported and the support component on same tunnel cross section, the support are laid in gate type support frame 3
Component is laid on gate type support frame 3；The gate type support frame 3 is located at the interim inverted arch in the same closed support frame
It bracket 2 and needs to change between arch 4, the gate type support frame 3 and needs to change to fasten between arch 4 by the support component and connect
It is connected in one, the support component includes being supported in 3 left side of gate type support frame and needing to change the left side between 4 left lower of arch
Supporting element 5 is supported in the right side of gate type support frame 3 and needs to change right side supporting piece 6 between 4 lower right side of arch and Duo Gen by a left side
In 3 top of gate type support frame and the top support 7 between arch 4, the Left-side support part 5, right side are needed to change to right support
Supporting element 6 and top support 7 are laid on same plane.
The Tunnel structure is tunnel arch wall preliminary bracing structure.
In the present embodiment, described in two extended segments to need to change the quantity of arch 4 be 3 Pin.
When practice of construction, according to specific needs, to the quantity for needing to change arch 4 described in two extended segments into
The corresponding adjustment of row.Wherein, the quantity that arch 4 is needed to change in the extended segment is more, and the length of the extended segment is longer.By
Extended segment is respectively set in the limit section front and rear sides of invading, and can effectively ensure construction safety, keeps tunnel structure after changing arch construction more steady
Gu.
The interim inverted arch bracket 2 is supported in the tunnel lower part that need to be changed in arch section and does not excavate on rock mass 8, described to face
When inverted arch further include not excavating the inverted arch concrete pouring structure 10 of pouring molding on rock mass 8 in tunnel lower part, the inverted arch is mixed
Solidifying soil pouring structure 10 is located at below the gantry type support construction.
In the present embodiment, the interim inverted arch bracket 2 and the longitudinal connection structure are poured in inverted arch concreting
In structure 10.
Thus, the globality of the interim inverted arch is strong, stabilized structure, solid base can be provided interim inverted arch bracket 2, with
Firm support is carried out to arch 4 is needed to change.
The supporting construction of institute's construction tunnel is composite lining structure, and the composite lining structure includes tunnel just branch knot
Structure and positioned at the Tunnel Second Lining at the beginning of the tunnel on the inside of branch structure.The country rock of institute's construction tunnel is that IV grade of country rock or V grade enclose
Rock, surrounding rock stability are poor.Also, institute's construction tunnel is large cross-section tunnel.
The large cross-section tunnel refers to tunnel cross section product > 50m2Tunnel.In the present embodiment, the large cross-section tunnel
Excavation width is not less than 10m and its tunnel height is not less than 8m.Wherein, excavation width, which refers to, considers secondary lining, tunnel
The maximum excavation width of outline excavation after preliminary bracing structure and deformation allowance, thus excavation width is tunnel excavation contour line
Maximum width.Tunnel height is the maximum height of tunnel excavation contour line, i.e. height in the middle part of tunnel excavation contour line.
In the present embodiment, when being excavated to institute's construction tunnel, excavated using bench cut method；Institute's construction tunnel
Tunnel includes tunnel top hole body 1 and the tunnel lower part hole body positioned at 1 lower section of tunnel top hole body.The first branch structure in the tunnel
Including to tunnel top hole body 1 arch wall carry out preliminary bracing the Tunnel structure and two under the tunnel
The left and right sides abutment wall of portion hole body carries out the abutment wall preliminary bracing structure of supporting, two abutment wall preliminary bracing symmetrical configuration cloth
Below the left and right sides of the Tunnel structure, two abutment wall preliminary bracing structures and the tunnel initial-stage
Supporting construction, which is fastenedly connected, to be integrated.
When being excavated using bench cut method to institute's construction tunnel, first along tunnel longitudinal extension from the front to the back to tunnel
Road top hole body 1 is excavated, and synchronous split digging molding tunnel top hole body 1 from the front to the back carries out initial stage branch in digging process
Shield, and obtain the Tunnel structure；Tunnel top hole body 1 is carried out in digging process, along the longitudinal extension side in tunnel
It is excavated to being synchronized from the front to the back to tunnel lower part hole body；The excavation progress of tunnel lower part hole body is later than on tunnel
The excavation progress of portion hole body 1.
When being excavated using bench cut method, excavated using up/down steps excavating load or three benching tunnelling methods.Using upper
When excavating load of getting out of a predicament or an embarrassing situation is excavated, the interim inverted arch bracket 2 is supported in get out of a predicament or an embarrassing situation on；It is excavated using three benching tunnelling methods
When, the interim inverted arch bracket 2 is supported on middle step.
The limit section of invading is that the Tunnel structure in tunnel top hole body 1 deforms and invades the tunnel construction sections of limit, real
When border is constructed, during tunnel the longitudinal extension from the front to the back progress of tunnel top hole body 1 preliminary bracing, become using tunnel
Shape monitors system and carries out deformation monitoring to the Tunnel structure of construction molding, and judges tunnel according to monitoring result
Whether preliminary bracing structure, which deforms, is invaded limit, and deform to Tunnel structure invade limit tunnel construction sections carry out it is true
It is fixed, it specifically deforms to Tunnel structure and invades the front and back end positions of the tunnel construction sections of limit and be determined respectively.
As shown in Figure 1 and Figure 2, the interim inverted arch bracket 2 is the arch support that the left and right sides is gradually bent upwards.Thus,
The interim inverted arch bracket 2 is antiarch shape.Compared to linear bracket, the interim inverted arch bracket 2 of antiarch shape by bottom collapse with
Support can effectively improve the supporting power for needing to change the external side wall rock of arch 4, and can carry out firm support to arch 4 is needed to change, together
When to be formed by closed support frame globality stronger, and be more convenient for and need to change 4 lower part of arch and be reliably connected.
Firm to support, the bottom shape of tunnel top hole body 1 is identical as the shape of interim inverted arch bracket 2, thus
The bottom of tunnel top hole body 1 is antiarch shape, and the structure of formed tunnel top hole body 1 in this way is more firm.When practice of construction,
The bottom of tunnel top hole body 1 may be plane.
In the present embodiment, the shape of the transverse shape of the inverted arch concrete pouring structure 10 and interim inverted arch bracket 2
It is identical.The cross section of the inverted arch concrete pouring structure 10 is antiarch shape.
Firm for simple processing and support, the interim inverted arch bracket 2 is shape steel bracket.It is further in the present embodiment
Enhance the connection reliability of interim inverted arch bracket 2 and inverted arch concrete pouring structure 10, and interim inverted arch bracket 2 of being more convenient for
Easy, steady installation, the interim inverted arch bracket 2 are bent by an I-steel.
It is described interim to ensure interim inverted arch bracket 2 and needing to change the connection reliability between arch 4 in the present embodiment
The both ends of inverted arch bracket 2 and need to change between arch 4 plug and be filled with billet 9, the billet 9 and interim inverted arch bracket 2 and
It needs to change arch 4 and is welded and fixed and be integrated.
In the present embodiment, the upper surface phase of the upper surface of the inverted arch concrete pouring structure 10 and interim inverted arch bracket 2
Concordantly, 3 bottom of gate type support frame is welded and fixed with interim inverted arch bracket 2.
As shown in figure 3, the longitudinal connecting member is longitudinally connected fashioned iron 12.For further enhance longitudinally connected fashioned iron 12 with
The connection reliability of inverted arch concrete pouring structure 10, further increases the globality of the interim inverted arch, and is more convenient for indulging
Easy, steady installation to connection fashioned iron 12, the longitudinally connected fashioned iron 12 be channel steel and its notch upward.
Simplicity is removed for the later period, and reduces steel using amount, saves construction cost, the longitudinal connection structure further includes multiple groups
Longitudinally connected reinforcing bar 13, be laid with one group between longitudinally connected fashioned iron 12 described in adjacent twice described in longitudinally connected reinforcing bar 13,
Longitudinally connected reinforcing bar 13 described in every group includes the longitudinally connected reinforcing bar 13 that multiple tracks is laid from left to right, the longitudinally connected reinforcing bar
13 lay along tunnel longitudinal extension, and longitudinally connected reinforcing bar 13 described in per pass is fastened with multiple interim inverted arch brackets 2
Connection.
In the present embodiment, the interim inverted arch bracket 2 is I22 shape steel bracket or I20 shape steel bracket, the interim inverted arch branch
Frame 2 is correspondingly arranged with arch 4 is needed to change, and interim inverted arch bracket 2 is integrated and is formed envelope with needing to change arch 4 and be fastenedly connected
Enclosed support frame, the interim inverted arch of construction molding make the arch wall closure cyclization that need to change arch section, can effectively reduce tunnel top
Hole body 1 is further restrained and is sunk.
Spacing between longitudinally connected fashioned iron 12 described in adjacent twice is 140cm~160cm, longitudinally connected steel described in every group
Spacing in muscle 13 between longitudinally connected reinforcing bar 13 described in adjacent twice is 40cm~60cm.In the present embodiment, the longitudinal direction connects
Direct type steel 12 be [100mm channel steel and its be welded as a whole with interim inverted arch bracket 2, longitudinally connected reinforcing bar 13 be φ 22mm reinforcing bar,
Spacing between longitudinally connected fashioned iron 12 described in adjacent twice is 150cm, adjacent twice in longitudinally connected reinforcing bar 13 described in every group
Spacing between the longitudinally connected reinforcing bar 13 is 50cm.When practice of construction, according to specific needs, to longitudinally connected fashioned iron 12
The size of used channel steel, the diameter of longitudinally connected reinforcing bar 13, the spacing between longitudinally connected fashioned iron 12 described in adjacent twice with
And the spacing in longitudinally connected reinforcing bar 13 described in every group between longitudinally connected reinforcing bar 13 described in adjacent twice is accordingly adjusted respectively
It is whole.
As shown in Figure 1 and Figure 2, firm to splice convenient and support, the gate type support frame 3 is by more fashioned iron rod pieces spellings
Molding support frame is filled, the Left-side support part 5, right side supporting piece 6 and top support 7 are fashioned iron rod piece, the left side
Supporting element 5, right side supporting piece 6 and top support 7 and gate type support frame 3 and need to change between arch 4 with welding manner into
Row is fixedly connected.
In the present embodiment, to further enhance support stability, the fashioned iron rod piece is I-steel.
In the present embodiment, the Left-side support part 5 is symmetrically arranged with right side supporting piece 6.Thus, the support component is adopted
With radial supporting way, symmetrical, multi-point, omnidirectional support are carried out to arch 4 is needed to change, can effectively reduce and need to change arch
4 further sink.
As shown in Figure 1 and Figure 2, the gate type support frame 3 is arranged vertically, described to need to change arch 4, gate type support frame 3
It is laid on same vertical plane with interim inverted arch bracket 2；The gate type support frame 3 includes lower beam 3-1, is located at lower beam 3-
Upper beam 3-2, the more vertical strut 3-4 being supported between lower beam 3-1 and upper beam 3-2 from left to right right above 1 and
The length of two symmetric supports vertical supports 3-3, the lower beam 3-1 of lower section at left and right sides of lower beam 3-1 are greater than upper cross
The length of beam 3-2, the upper beam 3-2 and lower beam 3-1 are respectively positioned on the surface of interim inverted arch bracket 2；Two described vertical
Clear distance between bracket 3-3 is not less than 4.5m, and the clear distance between 2 middle part the lower beam 3-1 and interim inverted arch bracket is not less than
4.5m.In this way, it is current to enable 3 effective guarantee face excavation construction machinery of gate type support frame, and support firm, stable.
In the present embodiment, the quantity of the top support 7 is three, the left and right of the lower beam 3-1 and upper beam 3-2
Two upper sides are symmetrically arranged with the top support 7, and the top support 7 is vertical supporting bar；The left side
The quantity of supporting element 5 and right side supporting piece 6 is one and both for inclined inclined shore bar gradually downward from outside to inside,
The Left-side support part 5 and right side supporting piece 6 are all connected to vertical supports 3-3 and need to change between arch 4.
When practice of construction, according to specific needs, to the number of top support 7, Left-side support part 5 and right side supporting piece 6
Amount and installation position adjust accordingly respectively.
As shown in figure 4, for the connection reliability for further enhancing interim inverted arch bracket 2 with needing to change arch 4, described in every Pin
The left and right sides lower part for needing to change arch 4 is laid with a support bracket 11, and two institutes on arch 4 are needed to change described in every Pin
State that support bracket 11 is symmetrically laid in 2 top of interim inverted arch bracket and the two is respectively positioned on and needs to change 4 inside of arch, interim inverted arch
It is carried out tightly by a support bracket 11 between the left and right ends of bracket 2 and the left and right sides lower part for needing to change arch 4
It is solidly connected.
In the present embodiment, the arch 4 that needs to change is grid steel frame, and each support bracket 11 is flat including multiple tracks
Row is connected to interim inverted arch bracket 2 and needs to change the spiral between arch 4, and the spiral is from outside to inside gradually downward
It tilts, spiral described in multiple tracks is from top to bottom laid and it is laid on same plane with the arch 4 that needs to change being connect.
To ensure to support the bonding strength between bracket 11 and the interim inverted arch, the globality of structure is further enhanced,
It is provided with arch springing concrete pouring structure 14 at left and right sides of the bottom of tunnel top hole body 1, arch is needed to change described in every Pin
The left and right sides arch springing of frame 4 is both secured on the arch springing concrete pouring structure 14, and two arch springing concrete pour
Building structure 14 is symmetrically arranged and the two is poured with inverted arch concrete pouring structure 10 and is integrated；The arch springing concreting knot
Structure 14 is laid along tunnel longitudinal extension, and the two support brackets 11 needed to change on arch 4 described in every Pin pour respectively
In in two arch springing concrete pouring structures 14, the upper surface of each arch springing concrete pouring structure 14 is and in it
The upper surface flush of the support bracket 11 in portion.
In this way, it is mixed by support bracket 11, arch springing concrete pouring structure 14 and inverted arch to need to change arch 4 described in every Pin
Solidifying soil pouring structure 10 is fastenedly connected with the interim inverted arch bracket 2 being located at immediately below it and is integrated, the institute that need to be changed in arch section
It needs to change arch 4 and is fastenedly connected by two arch springing concrete pouring structures 14 with the interim inverted arch and is integrated.
In the present embodiment, the spiral and interim inverted arch bracket 2 and need to change tight with welding manner between arch 4
It is solidly connected, thus connects reliable.
Before actually carrying out changing arch operation, first construct to the utility model, it specifically first need to be into institute's construction tunnel
The need that row changes arch change the interim inverted arch of construction in arch section, then erect on the interim inverted arch of construction molding multiple to needing to change arch
The gantry type support construction that frame 4 is supported.
When practical progress interim inverted arch construction, process is as follows:
Step 101, interim inverted arch rack construction: encircle the underface that arch 4 is needed to change described in every Pin of section in described need to change
Be respectively provided with the interim inverted arch bracket 2, and make each interim inverted arch bracket 2 be located at its right above needing to change
Arch 4, which is fastenedly connected, to be integrated；
Step 102, longitudinal connection structure construction: it is respectively provided with to the arch all underfaces for needing to change arch 4 of section that need to change
It after interim inverted arch bracket 2, constructs to the longitudinal connection structure, and described is faced by the longitudinal connection structure by multiple
When inverted arch bracket 2 be fastenedly connected and be integrated；
Step 103, inverted arch concreting: concreting is carried out to inverted arch concrete pouring structure 10.
When practice of construction, according to tunnel cross section size and wall rock geology condition, the interim inverted arch bracket 2 uses I22
Fashioned iron or I20 profile steel frame；It the interim inverted arch bracket 2 and needs to change and stoppers and weld using billet between arch 4, fill in steel
Before backing plate, the Surface layer's concrete for needing to change arch 4 need to be cut；It is especially grid steel frame when needing to change arch 4, then using is needing
Replacement 4 two sides of arch are all made of the mode that 3 groups of φ 22mm spirals reinforce connection, by interim inverted arch bracket 2 and need more
It changes arch 4 and is welded into bracket type of attachment, C20 concrete is perfused in bracket, to increase stability.Thus, the arch springing concrete pours
The strength grade of concrete of building structure 14 is C20.
To be removed convenient for the later period to the interim inverted arch, the strong concrete of the inverted arch concrete pouring structure 10
Degree grade is C15 or C10, and when pouring to inverted arch concrete pouring structure 10, concrete need to fill make firm by ramming it is closely knit.
After the 10 casting concrete final set of inverted arch concrete pouring structure, gate-type is erected by Pin on the interim inverted arch
Support frame 3, the radial erection I20 fashioned iron in the top and two sides of gate type support frame 3 (the i.e. described support component) are used to support original
Preliminary bracing arch (needs to change arch 4), and the support component is welded with needing to change arch 4 and hold out against.
To further ensure that support stability, described need to change all gate type support framves 3 in arch section longitudinally connected by multiple tracks
Component, which is fastenedly connected, to be integrated, and the longitudinal connecting component is laid along tunnel longitudinal extension.In the present embodiment, the longitudinal direction
Connecting elements is spliced by multiple fashioned iron segments laid from back to front, and each fashioned iron segment is all connected to two neighboring
Between the gate type support frame 3.The fashioned iron segment is I20 fashioned iron.
Since the headroom of the gate type support frame 3 is not less than 4.5m × 4.5m, when conditions permit, clear span is set as 5m, because
And can ensure that face excavation construction mechanical energy is smoothly passed through, the interim inverted arch does not influence to slap with the gantry type support construction
Sub- face normal construction.
When practice of construction, mesh sheet can be set up on gate type support frame 3,3 one side of gate type support frame, which can be used as, changes
Arch, pneumatically placed concrete job platform, safety coefficient are high；On the other hand, the gate type support frame 3 is to lower part vehicular traffic, Ren Yuantong
Row plays effective protective action.
In the present embodiment, when the replacement steel arch-shelf 4 is shaped steel arch, under the left and right sides for needing to change arch 4
No setting is required in portion support bracket 11；When the replacement steel arch-shelf 4 is grillage, the left and right sides for needing to change arch 4
A support bracket 11 is laid in lower part, and is provided with arch springing concrete at left and right sides of the bottom of tunnel top hole body 1 and pours
Building structure 14.
Using the interim inverted arch and the gantry type support construction, described need to change can be made to encircle circumferential quick-make in section,
Be conducive to control further sedimentation, convergence.
In the present embodiment, the arch abutment that changes is the rear end that need to change arch section；
When actually carrying out changing arch construction, since arch abutment is changed in the starting, from the front to the back to the institute that need to be changed in arch section
Tunnel structure is stated to be removed.
In the present embodiment, the Tunnel structure in tunnel top hole body 1 is using steel arch-shelf and Bolt net and jet
The steel arch-shelf of Support Method construction molding and the structure of anchor net unit support structure and the two are all the same, the steel arch-shelf
It is branch structure at the beginning of carrying out the arch wall of supporting to the tunnel arch wall of tunnel top hole body 1 with anchor net unit support structure.
The steel arch-shelf and anchor net unit support structure include that more Pin are laid from the front to the back along tunnel longitudinal extension
The steel arch-shelf, multiple suspension roof support structures laid from the front to the back along tunnel longitudinal extension, be mounted on it is multiple described
Reinforced mesh on steel arch-shelf and the concrete ejection layer being injected on Tunnel inner wall, the reinforced mesh and multiple steel
Arch is both secured in concrete ejection layer；The steel arch-shelf is located on the inside of the reinforced mesh；Each suspension roof support knot
Structure includes multiple anchor poles being laid in tunnel arch wall along tunnel excavation contour line, and multiple anchor poles are laid in same
On tunnel cross section；Anchor pole in the two neighboring suspension roof support structure in front and back is in be laid staggeredly.
In the present embodiment, steel arch-shelf described in more Pin in the Tunnel structure is in uniformly distributed, adjacent two Pin
Spacing between the steel arch-shelf is d, thus the length of the extended segment is 3d.
When practice of construction, the left and right sides bottom outside of steel arch-shelf described in every Pin is provided with a lock foot anchoring stock 15.
When actually carrying out changing arch construction, since arch abutment is changed in the starting, at the beginning of the tunnel that need to be changed in arch section
Phase supporting construction is removed, and is synchronized in demolishing process and is carried out preliminary bracing construction, tunnel after being replaced to the arch section that need to change
Road preliminary bracing structure.
When being removed to the Tunnel structure, according to the outline excavation that need to change arch section being pre-designed
Line cuts the concrete ejection layer along tunnel longitudinal extension from the front to the back, and carries out secondary open to the arch section that need to change
It digs；
During being cut to the concrete ejection layer, the concrete ejection layer is cut from the front to the back rear exposed
The steel arch-shelf replaced one by one.
During being cut to the concrete ejection layer, synchronized from the front to the back to inverted arch concrete pouring structure 10
The left and right sides is cut respectively, and 10 left and right sides of inverted arch concrete pouring structure cuts progress and concrete spray
Penetrate layer to cut progress identical.
In the present embodiment, when being removed to the Tunnel structure that need to be changed in arch section, first to described
Starting replacement arch is replaced, then steel arch-shelf need to be supported to carry out by Pin more to described from the front to the back along tunnel longitudinal extension
It changes；
When being replaced to starting replacement arch, starting replacement arch is removed, and is replaced in the starting
Again steel arch-shelf is erected at arch present position, the steel arch-shelf erected again is to have replaced steel arch-shelf；
To it is described steel arch-shelf need to be supported to replace when, steel arch-shelf and the gantry type support construction need to be supported by first disconnecting this
Between connection, then this it is described steel arch-shelf need to be supported to remove, and frame again need to be supported at steel arch-shelf present position at this
Vertical steel arch-shelf, the steel arch-shelf erected again are to have replaced steel arch-shelf；Steel arch-shelf need to be supported to carry out in demolishing process this, it will be to this
The gantry type support construction that steel arch-shelf need to be supported to be supported moves backward and steel arch-shelf rear side need to be supported adjacent this
Steel arch-shelf has been replaced to be supported.
As shown in the above, it is removed the first Pin steel steelframe (the i.e. described starting replacement arch) that arch is changed since quasi- dismounting
Raw steel arch applies steel arch-shelf again, and carries out the preliminary bracings such as Bolt net and jet construction；According to site specific, remove previous
Gantry type support construction described in Pin, which is displaced to, has changed on arch steel arch-shelf (having replaced steel arch-shelf).Thus, steel arch-shelf is removed, weight
Steel arch-shelf is newly applied, it is a Pin that Bolt net and jet preliminary bracing and preceding Pin door frame gantry type support construction, which are moved back to having changed on arch steel arch-shelf,
The steel arch-shelf changes arch working procedure, and repeatedly circulation carries out, until completing the whole that need to change all steel arch-shelfs in arch section
Change arch work progress.It is displaced to as removing gantry type support construction described in previous Pin and has changed arch steel arch-shelf and (replaced steel
Arch) on, thus can be effectively ensured and change arch construction period multiple gantry type support constructions with interim inverted arch simultaneously to described
Entirety, the joint support of arch section need to be changed, it is ensured that work progress is safe and reliable.
It changes in arch work progress and changes after the completion of arch construction, be all made of tunnel deformation monitoring system at the beginning of tunnel after replacement
Phase supporting construction carries out deformation monitoring, after Tunnel malformation is stablized after the replacement, then longitudinally prolongs along tunnel
Direction is stretched from the front to the back to excavate tunnel lower part hole body；Tunnel lower part hole body is carried out in digging process, by
The utility model is removed before backward, while preliminary bracing is carried out to tunnel lower part hole body from the front to the back.
The above is only the preferred embodiment of the utility model, not imposes any restrictions to the utility model, all
According to any simple modification to the above embodiments of the utility model technical spirit, change and equivalent structural changes, still
Belong in the protection scope of technical solutions of the utility model.
Claims (10)
1. a kind of tunnel arch wall preliminary bracing invades limit and changes arch construction gib system, it is characterised in that: need to be changed including being laid in
It interim inverted arch in arch section and multiple is laid on the interim inverted arch from front to back and to needing to change what arch (4) was supported
Gantry type support construction, it is described need to change arch section be tunnel top hole body (1) in Tunnel structure constructed completion and
The tunnel construction sections that tunnel lower part hole body does not excavate；The interim inverted arch is laid along tunnel longitudinal extension, the interim inverted arch position
In tunnel top hole body (1) inside bottom；Described need to change arch (4) are in the Tunnel structure to tunnel top
The arch wall of hole body (1) carries out the steel arch-shelf of supporting, all steel arches that need to be changed in arch section in the Tunnel structure
Frame is to need to change arch (4)；Arch abutment is changed for starting in described one end that need to change arch section, described to change in arch section near described
Beginning, which changes, needs to change arch (4) as starting replacement arch described in a Pin of arch abutment, described need to change is encircleed in section except starting replacement arch
All arches (4) that need to change except frame are that need to support steel arch-shelf；Support steel arch-shelf is needed to pass through described in one described in every Pin
Gantry type support construction is supported, and support steel arch-shelf is needed to tie with the gantry type support supported described in every Pin
Structure is laid on same tunnel cross section；It is described need to change arch section for needed in institute's construction tunnel the tunnel construction sections for carrying out changing arch and its by invading
Limit section and two be located at invade limit section front and rear sides extended segment be formed by connecting, it is described invade limit section be tunnel top hole body (1)
Interior Tunnel structure, which deforms, invades the tunnel construction sections of limit, two extended segments be in institute's construction tunnel with it is described
The adjacent and interconnected tunnel construction sections of limit section are invaded, the quantity for needing to change arch (4) is no less than 3 in two extended segments
Pin；
The interim inverted arch includes multiple interim inverted arch brackets (2) laid from the front to the back along tunnel longitudinal extension and will be more
A interim inverted arch bracket (2) is fastenedly connected the longitudinal connection structure being integrated, and the longitudinal connection structure includes multiple tracks edge
The longitudinal connecting member that the length direction of interim inverted arch bracket (2) is laid from left to right, the longitudinal connecting member longitudinally prolong along tunnel
Direction laying is stretched, longitudinal connecting member described in per pass is fastenedly connected with multiple interim inverted arch brackets (2)；The interim inverted arch
Bracket (2) is the arch support for being laid in tunnel top hole body (1) inside bottom, needed to change described in every Pin arch (4) just under
Side be provided with the interim inverted arch bracket (2), needed to change described in every Pin arch (4) be located at its immediately below it is interim
Inverted arch bracket (2) is laid on same tunnel cross section and the two forms a closed support frame, each interim inverted arch
The left and right ends of bracket (2) are fastenedly connected with the left and right sides lower part for needing to change arch (4) being located at right above it respectively；Each
The gantry type support construction is provided in the closed support frame, the need in each closed support frame are more
It changes arch (4) and is fastenedly connected by the gantry type support construction with interim inverted arch bracket (2) and is integrated；
Each gantry type support construction includes one and is fixed on interim inverted arch bracket (2) and to needing to change arch (4)
The gate type support frame (3) being supported and the support component being laid in gate type support frame (3) on same tunnel cross section, it is described
Support component is laid on gate type support frame (3)；The gate type support frame (3) is located in the same closed support frame
It interim inverted arch bracket (2) and needs to change between arch (4), the gate type support frame (3) and needs to change and pass through institute between arch (4)
It states support component and is fastenedly connected and be integrated, the support component includes being supported on the left of gate type support frame (3) and needing to change arch
(4) the Left-side support part (5) between left lower, be supported on the right side of gate type support frame (3) and need to change arch (4) lower right side
Between right side supporting piece (6) and more be supported at the top of gate type support frame (3) and needed to change between arch (4) from left to right
Top support (7), the Left-side support part (5), right side supporting piece (6) and top support (7) are laid in same plane
On.
2. tunnel arch wall preliminary bracing described in accordance with the claim 1 invades limit and changes arch construction gib system, it is characterised in that:
Needing to change the quantity of arch (4) described in two extended segments is 3 Pin.
3. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: the interim inverted arch bracket (2) is supported in the tunnel lower part that need to be changed in arch section and does not excavate on rock mass (8), described interim
Inverted arch further includes not excavating the inverted arch concrete pouring structure (10) of pouring molding on rock mass (8), the inverted arch in tunnel lower part
Concrete pouring structure (10) is located at below the gantry type support construction；The interim inverted arch bracket (2) and the longitudinal direction connect
Binding structure pours in inverted arch concrete pouring structure (10).
4. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: institute's construction tunnel is large cross-section tunnel；The interim inverted arch bracket (2) is the arch branch that the left and right sides is gradually bent upwards
Frame.
5. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
It is shape steel bracket in: the interim inverted arch bracket (2), the both ends of the interim inverted arch bracket (2) and needs to change between arch (4)
Plug is filled with billet (9), the billet (9) and interim inverted arch bracket (2) and to need to change arch (4) and be welded and fixed be one
Body.
6. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: the interim inverted arch bracket (2) is bent by an I-steel.
7. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: the gate type support frame (3) is by the assembled molding support frame of more fashioned iron rod pieces, the Left-side support part (5), right side branch
Support member (6) and top support (7) are fashioned iron rod piece, the Left-side support part (5), right side supporting piece (6) and top braces
Part (7) and gate type support frame (3) and needing to change is fixedly connected between arch (4) with welding manner.
8. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: the longitudinal connecting member is longitudinally connected fashioned iron (12)；The longitudinal connection structure further includes the longitudinally connected reinforcing bar of multiple groups
(13), be laid with one group between longitudinally connected fashioned iron (12) described in adjacent twice described in longitudinally connected reinforcing bar (13), every group of institute
State the longitudinally connected reinforcing bar (13) that longitudinally connected reinforcing bar (13) is laid including multiple tracks from left to right, the longitudinally connected reinforcing bar
(13) laid along tunnel longitudinal extension, longitudinally connected reinforcing bar (13) described in per pass with multiple interim inverted arch brackets
(2) it is fastenedly connected.
9. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature exists
In: the left and right sides lower part that arch (4) is needed to change described in every Pin is laid with a support bracket (11), needs to change described in every Pin
Two support brackets (11) on arch (4), which are symmetrically laid in above interim inverted arch bracket (2), and the two is respectively positioned on needs
It replaces on the inside of arch (4), between the left and right ends of interim inverted arch bracket (2) and the left and right sides lower part for needing to change arch (4)
It is fastenedly connected by a support bracket (11)；Described need to change arch (4) are grid steel frame, each support
Bracket (11) includes that multiple tracks is connected in parallel to interim inverted arch bracket (2) and needs to change the spiral between arch (4), described
Spiral tilts gradually downward from outside to inside, spiral described in multiple tracks from top to bottom lay and its with the need that are connect more
Arch (4) is changed to be laid on same plane.
10. tunnel arch wall preliminary bracing according to claim 1 or 2 invades limit and changes arch construction gib system, feature
Be: the gate type support frame (3) is arranged vertically, described to need to change arch (4), gate type support frame (3) and interim inverted arch
Bracket (2) is laid on same vertical plane；The gate type support frame (3) includes lower beam (3-1), is located at lower beam (3-1)
The upper beam (3-2) of surface, the more vertical struts being supported between lower beam (3-1) and upper beam (3-2) from left to right
The vertical supports (3-3) of (3-4) and two symmetric supports lower section at left and right sides of lower beam (3-1), the lower beam (3-1)
Length is greater than the length of upper beam (3-2), and the upper beam (3-2) and lower beam (3-1) are respectively positioned on interim inverted arch bracket (2)
Surface；Clear distance between two vertical supports (3-3) is not less than 4.5m, the lower beam (3-1) and interim inverted arch branch
Clear distance between in the middle part of frame (2) is not less than 4.5m.
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| CN108868834A (en) * | 2018-07-10 | 2018-11-23 | 中铁二十局集团有限公司 | Tunnel arch wall preliminary bracing invades limit and changes arch construction gib system |
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