CN108979677A - Spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows change just branch structure and construction method - Google Patents
Spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows change just branch structure and construction method Download PDFInfo
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- CN108979677A CN108979677A CN201811151337.7A CN201811151337A CN108979677A CN 108979677 A CN108979677 A CN 108979677A CN 201811151337 A CN201811151337 A CN 201811151337A CN 108979677 A CN108979677 A CN 108979677A
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- 239000007921 spray Substances 0.000 title claims abstract description 25
- 230000008859 change Effects 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 58
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 32
- 239000011378 shotcrete Substances 0.000 claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000002787 reinforcement Effects 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- QLMNCUHSDAGQGT-UHFFFAOYSA-N sintofen Chemical compound N1=C(C(O)=O)C(=O)C=2C(OCCOC)=CC=CC=2N1C1=CC=C(Cl)C=C1 QLMNCUHSDAGQGT-UHFFFAOYSA-N 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/28—Longitudinal struts, i.e. longitudinal connections between adjoining arches
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention disclose a kind of spray based on friction energy-dissipating stringer it is mixed-steelframe integrally allows change just branch structure and construction method, including steelframe, friction energy-dissipating stringer, gunite concrete, reinforced mesh, longitudinal screw reinforcing bar, circumferential spiral, steelframe to be formed by fashioned iron clod wash；Friction energy-dissipating stringer using the upper load-bearing body and lower load-bearing part of channel steel mainly by being constituted, energy is consumed by the rubbing action between both upper load-bearing body and lower load-bearing part wing plate, longitudinal screw reinforcing bar is added in gunite concrete between two Pin steelframes, circumferential spiral, while realizing Tunnel and peripheral rock cooperative transformation, friction energy-dissipating stringer still ensures that preliminary bracing has certain resistance to compression and shear resistance, pass through setting circumferential direction and longitudinal reinforcement, the elongated arrangement of friction energy-dissipating stringer, enhance the preliminary bracing structure common eigenvector ability that gunite concrete forms between tunnel steelframe and steelframe, it avoids steelframe and gunite concrete deformation causes structure to be destroyed, realize " coupling hardness with softness " improvement.
Description
Technical field
The invention belongs to Tunnel Engineering support technology field, specifically a kind of spray based on friction energy-dissipating stringer mixes-steelframe
Entirety, which allows, becomes just branch structure and construction method, is integrally to change to existing tunnel preliminary bracing structure stress mode, is suitable for tunnel
The control of road engineering preliminary bracing large deformation disaster.
Background technique
To solve the problems, such as China's eastern and western regions disparate development, insufficient, the infrastructure constructions such as traffic, water conservancy gradually to
Western part inclination, based on the landform of mountain Gao Gushen, relief is big in west area, leads to central and west regions traffic tunnel and water conservancy project
The construction such as tunnel are in the high-speed developing period.Since west area is in Continental Plates Collision area, cause enclosing lithologies it is changeable,
Rock crushing is weak, crustal stress is high, unfavorable geology and Special Rock outstanding problem, and when Tunnel Engineering penetrating ground is commonly encountered country rock
Large deformation problem.It shows as that tunnel deformation speed is fast, restrains that stablize the time long, or even can not restrain, and deflection is big, if just
Phase supporting is improper, not in time, during surrouding rock deformation tunnel may early period of origination supporting chip off-falling, invade limit even unstability landslide.
Relatively conventional is Bolt net and jet preliminary bracing cracking, peels off, crushing, and along with first branch steelframe torsional deformation, or even intrusion
Limit.In Tunnel Engineering circle, large deformation problem is known as the title of tunnel " cancer ".After avoiding preliminary bracing structure large deformation from invading limit
Cause secondary lining thickness inadequate, generally require to remove the preliminary bracing structure for invading limit, this aspect causes engineering to repeat, and lags
Project progress, while preliminary bracing changes in the process also along with biggish security risk, seriously constrains Tunnel Engineering construction
Progress and cost control.
When Tunnel Engineering encounters large deformation at present, existing countermeasure is mostly to increase deformation allowance, allows it to deform, but become
Shape is unlikely to lead to invade limit.By adjusting lining cutting contour curvature in structure, so that stress is more reasonable.In terms of construction, it is short into
Ruler, just branch steelframe closing is cyclic as early as possible, or system anchor bolt is combined to lengthen, and the modes such as grouting and reinforcing reinforce country rock, more so
Person is using the double-deck steelframe resistance to deformation.The comprehensive utilization of above-mentioned measure, large deformation problem can not effectively be administered at present by seeing.For
Such problem, one of river harnessing ideas are " rigid protection ", that is, rely on the enough rigidity of rigid frame shotcrete support structure
And intensity, to resist weak surrounding rock deformation.This thinking often occurs changeing preliminary bracing repeatedly in construction, and essence is exactly
In the early stage supporting construction ensure security situation under gradually discharges surrouding rock stress, until pressure from surrounding rock discharge to preliminary bracing drag
Balance, tunnel just branch deformation can just tend towards stability.
Another river harnessing ideas is " coupling hardness with softness ", i.e., in rigid frame shotcrete support structure, using scalable steel
Frame, as U-shaped steel frame, C-type steel frame have application, circumferentially compressive deformation after steelframe stress.In addition still have using pressure-relieving achor bar
(rope), with certain constant supporting power to country rock apply " while aid the border areas allow, first it is soft after just " drag.
The scalable steelframe applied at present only focuses on the connection of steelframe upper-lower section, joint be can contracting formula, spray is mixed still
Upper and lower monolithic.Therefore the joint structure is in application process because cannot be with gunite concrete in vertical, radial large deformation
Stress cooperative transformation together, often shows as steelframe and gunite concrete separates or even gunite concrete limits to contract
Formula steelframe is mobile, or in the case where not focusing on joint protective, by connector spray concrete cause slidably connector lose its cunning
Dynamic function.As it can be seen that only steelframe joint slidably, the machine of concrete cooperative transformation between steelframe and steelframe can not be formed
System causes scalable steelframe effect that can not play.
Summary of the invention
For the limitation of above-mentioned existing scalable steelframe technology, the present invention provides a kind of spray based on friction energy-dissipating stringer
Mixed-steelframe integrally allows the first branch structure and construction method of change.
The present invention is achieved by following specific technical solution:
A kind of spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows change just branch structure, including steelframe, friction energy-dissipating stringer, spray
It penetrates concrete, reinforced mesh, longitudinal screw reinforcing bar and circumferential spiral, the steelframe to be formed by fashioned iron clod wash, the friction
Energy consumption stringer is made of the upper load-bearing body and lower load-bearing part made of channel steel, and bolt hole is arranged on the wing plate of upper load-bearing body, under
Strip sliding slot is set on the wing plate of load-bearing part, is connected between upper load-bearing body and lower load-bearing part by high-strength bolt, upper load-bearing body is under
Prepared screw-bolt hole on the web of load-bearing part, to be bolted with steelframe；It is added in gunite concrete between two Pin steelframes
Longitudinal screw reinforcing bar and circumferential spiral, longitudinal screw reinforcing bar and circumferential spiral infall binding, longitudinal screw reinforcing bar
Both ends are welded on steelframe, and circumferential spiral both ends are welded on friction energy-dissipating stringer upper load-bearing body and lower load-bearing part.
Preferably, steelframe can be the grid steel frame or other forms profile steel frame of different model reinforcement fabrication.
Preferably, the strip sliding slot edge setting on lower load-bearing part wing plate increases resistance sawtooth.
Preferably, upper load-bearing body is oppositely positioned, and constitutes friction energy-dissipating stringer with lower load-bearing part.
Preferably, upper load-bearing body and lower load-bearing part are used with model channel steel, and the two wing plate, which is staggered to overlap, constitutes friction energy-dissipating
Stringer.
Preferably, high strong spring is set between upper load-bearing body and lower load-bearing part.
Preferably, U-shaped elastic slice is set between upper load-bearing body and lower load-bearing part.
Spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows the construction method for becoming just branch structure, concrete operation step are as follows:
1, steelframe and the production of friction energy-dissipating stringer: steelframe is made by Tunnel Design size cold-rolled forming section.On the wing plate of upper load-bearing body
Bolt hole is set, strip sliding slot is set on the wing plate of lower load-bearing part, is connected between upper load-bearing body and lower load-bearing part by high-strength bolt
It is assembled into friction energy-dissipating stringer.Bolt hole is opened up on upper load-bearing body and lower load-bearing part, to pass through high-strength bolt with steelframe connector
Connection.And examination spelling and inspection are carried out outside hole.
2, after the completion of tunnel top bar is excavated, first pneumatically placed concrete.The installation of friction energy-dissipating stringer should be first removed before erecting steelframe
The empty slag and sundries of position.Friction energy-dissipating stringer is placed in firm foundations, top bar steelframe is upper with friction energy-dissipating stringer
Load-bearing part is connected by high-strength bolt, is welded together between friction energy-dissipating stringer by connecting plate, is formed longitudinally through beam.Reinforcing bar
The inside of country rock side wing edge is leaned in mesh sheet joint welding in two sides steelframe 1.
3, longitudinal screw reinforcing bar and circumferential spiral are installed, longitudinal screw reinforcing bar both ends are welded on steelframe, circumferential spiral shell
Line reinforcing bar both ends are welded on the upper load-bearing body and lower load-bearing part of friction energy-dissipating stringer.
4, multiple pneumatically placed concrete, when multiple pneumatically placed concrete, should be reserved at friction energy-dissipating stringer wouldn't pneumatically placed concrete, the spray of remaining position
Concrete covering is penetrated, gunite concrete answers the bottomed surface for filling up upper load-bearing body, sufficiently to transmit pressure.
5, it excavates and gets out of a predicament or an embarrassing situation, first pneumatically placed concrete after-frame makes step steelframe, the lower load-bearing part of steelframe and friction energy-dissipating stringer
It is connected by high-strength bolt.
6, longitudinal screw reinforcing bar and circumferential spiral are installed with step 3, answer pneumatically placed concrete with step 4.Notice that injection is mixed
Covering friction energy-dissipating stringer should be avoided when solidifying soil.
7, it is vertical by high-strength bolt on the inside of fastening tunnel on strip sliding slot and friction energy-dissipating after monitoring surrouding rock deformation is stablized
Note rapid hardening expansive concrete is in beam to lock deformation.
8, surrouding rock deformation is stable or after allowing and becoming device closure, and reserved position can be sprayed to full concrete.
The principle of the present invention is:
(1) the large deformation administration idea of " after first soft just, soft just and help " is deferred to, pressure from surrounding rock acts on steelframe and gunite concrete
On, initial bracing structural stress is finally transmitted on friction-type longitudinal beam structure, discharges pressure from surrounding rock by its friction energy-dissipating, is led to
It crosses stringer support and upper-lower section is sprayed into mixed entirety separately, achieve the purpose that steelframe-spray mixes overall deformation and coordinates.Friction energy-dissipating stringer is made
Structure changes are allowed also to have while allowing certain deformation by the rubbing action between upper and lower load-bearing part wing plate for one kind is novel
Enough circumferential direction anti-pressure abilities.
(2) bar shaped sliding slot on fastening friction energy-dissipating stringer can be passed through according to Monitoring During The Access result during surrouding rock deformation
On high-strength bolt and in friction energy-dissipating stringer slip casting lock deflection, make friction energy-dissipating stringer as rigid member stress.
(3) it by adding high strong spring or high-strength elastic gasket on load-bearing part lower in friction energy-dissipating stringer, is consumed in friction
Can stringer certain deformation occur realize that level-one allows after change, upper load-bearing body supports upper high strong spring or high-strength elastic after moving down certain distance
Gasket is superimposed its elastic resistance and realizes that second level allows change.
(4) if surrouding rock stress not yet releases when friction energy-dissipating stringer is closed, friction energy-dissipating stringer is as entire initial stage branch
Rigid member in protection structure continues to carry, and achievees the purpose that allow just branch limited configurations deformation and ensures safety.
(5) by adding longitudinal direction and circumferential reinforcement to gunite concrete steelframe, reinforcing bar is fixed on steelframe and friction energy-dissipating
On stringer, gunite concrete and steelframe stress, and friction energy-dissipating stringer longitudinally elongated setting as a whole enhance initial stage branch
The compatible deformation ability of protection structure can be destroyed to avoid uncoordinated caused be detached from of gunite concrete and steel frame deformation.
The invention has the benefit that
1, friction energy-dissipating stringer passes through upper load-bearing body and lower carrying mainly by constituting using the upper load-bearing body and lower load-bearing part of channel steel
Rubbing action between both parts wing plate consumes energy, adds longitudinal screw reinforcing bar, circumferential direction in the gunite concrete between two Pin steelframes
Spiral, while realizing Tunnel and peripheral rock cooperative transformation, friction energy-dissipating stringer still ensures that initial stage
Supporting has certain resistance to compression and shear resistance, and by setting circumferential direction and longitudinal reinforcement, the elongated arrangement of friction energy-dissipating stringer greatly increases
The strong preliminary bracing structure common eigenvector ability that gunite concrete forms between tunnel steelframe and steelframe, avoids steelframe and injection
Concrete deformation is uncoordinated to cause structure to be destroyed.The present invention is realized to be administered for country rock large deformation " coupling hardness with softness ", is realized
Preliminary bracing structure overall deformation is coordinated.
2, applicable range is wide, takes full advantage of steel mechanics performance, fashioned iron, steel plate, bolt etc. are that construction site is normal
See material, it is easy to process, it is easy to use.
3, each component of friction energy-dissipating stringer is convenient for disassembly and assembly, does not increase working procedure, friction energy-dissipating stringer component factory into
Row welds and grooved bore, assembled in tunnel, and easy construction is easy to spread.
Detailed description of the invention
Fig. 1 is structural facades schematic diagram of the invention.
Fig. 2 is structure schematic longitudinal section of the invention.
Fig. 3 is structure three-dimensional schematic diagram of the invention.
Fig. 4 is the structural schematic diagram of the embodiment one of friction energy-dissipating stringer in Fig. 1.
Fig. 5 is the cross section structure schematic diagram of Fig. 4.
Fig. 6 is the side structure schematic diagram of Fig. 4.
Fig. 7 is the overlooking structure diagram of Fig. 4.
Fig. 8 is that structural detail of the invention connects diagrammatic cross-section.
Fig. 9 is the Section A-A schematic diagram of Fig. 8.
Figure 10 is that strip sliding slot 7 adds resistance 1 type schematic diagram of sawtooth.
Figure 11 is that strip sliding slot 7 adds resistance 2 type schematic diagram of sawtooth.
Figure 12 is that strip sliding slot 7 adds resistance 3 type schematic diagram of sawtooth.
Figure 13 is that strip sliding slot 7 adds resistance 4 type schematic diagram of sawtooth.
Figure 14 is the structural schematic diagram of the embodiment two of friction energy-dissipating stringer 2.
Figure 15 is the structural schematic diagram of the embodiment three of friction energy-dissipating stringer 2.
Figure 16 is the structural schematic diagram of the example IV of friction energy-dissipating stringer 2.
Figure 17 is the structural schematic diagram of the embodiment five of friction energy-dissipating stringer 2.
Each label in figure are as follows: 1- steelframe；2- friction energy-dissipating stringer；3- gunite concrete；4- upper load-bearing body；It is carried under 5-
Part；6- bolt hole；7- strip sliding slot；8- high-strength bolt；9- longitudinal screw reinforcing bar；10- circumferential direction spiral；11- high strong spring；
12-U type elastic slice；13- connecting plate；14- reinforced mesh；15- top bar；16- gets out of a predicament or an embarrassing situation.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
As shown in Fig. 1 ~ 9, the spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows change just branch structure includes steelframe 1, friction
Consume energy stringer 2, gunite concrete 3.Steelframe 1 is formed by fashioned iron clod wash；Friction energy-dissipating stringer is by 4 He of upper load-bearing body using channel steel
Lower load-bearing part 5 is constituted, and bolt hole 6 is arranged on the wing plate of upper load-bearing body 4, strip sliding slot 7 is arranged on the wing plate of lower load-bearing part 5, on
It is connected between load-bearing part 4 and lower load-bearing part 5 by high-strength bolt 8.Bolt hole is set on the web of upper load-bearing body 4 and lower load-bearing part 5
6, it is bolted with steelframe 1.Longitudinal screw reinforcing bar 9 and circumferential spiral are added in two gunite concretes 3 of Pin steelframe 1
10, longitudinal screw reinforcing bar 9 and circumferential 10 infall of spiral binding, 9 both ends of longitudinal screw reinforcing bar are welded on steelframe 1, ring
It is welded on friction energy-dissipating stringer upper load-bearing body 4 and lower load-bearing part 5 to 10 both ends of spiral.
As shown in figures 10-13, the settable various shape as needed of 7 inward flange of strip sliding slot on lower 5 wing plate of load-bearing part
Increasing hinder sawtooth.Such as waveform sawtooth, rectangular saw-tooth, three shape sawtooth.
2 embodiment two of friction energy-dissipating stringer as shown in figure 14, upper load-bearing body 4 is oppositely positioned, and rubs with lower load-bearing part 5 composition
Wipe energy consumption stringer.
2 embodiment three of friction energy-dissipating stringer as shown in figure 15, upper load-bearing body 4 and lower load-bearing part 5 are using with model channel steel, and two
Person's wing plate, which is staggered to overlap, constitutes friction energy-dissipating stringer.
2 example IV of friction energy-dissipating stringer as shown in figure 16, is arranged high strong spring 11 between upper load-bearing body 4 and lower load-bearing part 5.
2 embodiment five of friction energy-dissipating stringer as shown in figure 17, is arranged U-shaped elastic slice 12 between upper load-bearing body 4 and lower load-bearing part 5.
Spray based on friction energy-dissipating stringer is mixed-and steelframe integrally allows the construction method for becoming just branch structure, the specific steps are that:
1, steelframe 1 and friction energy-dissipating stringer 2 make: making steelframe 1 by Tunnel Design size cold-rolled forming section.The wing of upper load-bearing body 4
Bolt hole 6 is set on plate, strip sliding slot 7 is set on the wing plate of lower load-bearing part 5, by high-strength between upper load-bearing body 4 and lower load-bearing part 5
Bolt 8 assembles into friction energy-dissipating stringer 2.Bolt hole 6 is opened up on upper load-bearing body 4 and lower load-bearing part 5, to connect with steelframe 1
Head is connected by high-strength bolt 8.And examination spelling and inspection are carried out outside hole.
2, after the completion of tunnel top bar 15 is excavated, first pneumatically placed concrete 3.Friction energy-dissipating stringer should be first removed before erecting steelframe 1
The empty slag and sundries of 2 installation sites.Friction energy-dissipating stringer 2 is placed in firm foundations, top bar steelframe 1 and friction energy-dissipating are vertical
The upper load-bearing body 4 of beam 2 is connected by high-strength bolt 8, is welded together between friction energy-dissipating stringer 2 by connecting plate 13, is formed vertical
To joist.The inside of country rock side wing edge is leaned in 14 joint welding of reinforced mesh in two sides steelframe 1.
3, longitudinal screw reinforcing bar 9 and circumferential spiral 10 are installed, 9 both ends of longitudinal screw reinforcing bar are welded on the wing of steelframe 1
On plate, circumferential 10 both ends of spiral are welded on the upper load-bearing body 4 and lower load-bearing part 5 of friction energy-dissipating stringer.
4, multiple pneumatically placed concrete 3.When multiple pneumatically placed concrete 3, should be reserved at friction energy-dissipating stringer 2 wouldn't pneumatically placed concrete, remaining part
Position gunite concrete covering, gunite concrete 3 answers the bottomed surface for filling up upper load-bearing body 4, sufficiently to transmit pressure.
5, it excavates and gets out of a predicament or an embarrassing situation 16, first 3 after-frame of pneumatically placed concrete makes step steelframe 1, under steelframe 1 and friction energy-dissipating stringer 2
Load-bearing part 5 is connected by high-strength bolt 8.
6, longitudinal screw reinforcing bar 9 and circumferential spiral 10 are installed with step 3, answer pneumatically placed concrete 3 with step 4.Pay attention to spray
Covering friction energy-dissipating stringer 2 should be avoided when penetrating concrete.
7, after monitoring surrouding rock deformation is stablized, pass through the high-strength bolt 8 and friction energy-dissipating on strip sliding slot 7 on the inside of fastening tunnel
Note rapid hardening expansive concrete is in stringer 2 to lock deformation.
8, surrouding rock deformation is stable or after allowing and becoming device closure, and reserved position can be sprayed to full concrete.
As shown in Fig. 2, injection can be enhanced in the longitudinal screw reinforcing bar 9 being arranged between two Pin steelframes 1 and circumferential spiral 10
The bearing capacity and deformability of concrete 3, it is proposed that its longitudinal and circumferential minimum steel ratio is not less than 0.2%, it is two-way all by
Power reinforcing bar minimum steel ratio is not less than 0.4%.
As shown in figure 3, respectively at welded connecting plate on upper load-bearing body 4 and lower load-bearing part 5 between two section friction energy-dissipating stringers 2
13, a stringer is constituted, to enhance the compatibility of deformation ability of entire just branch supporting construction.
As shown in figs. 4-7, upper load-bearing body 4 and lower load-bearing part 5 require straight, and surface is indefectible, upper and lower load-bearing part after assembling
Wing plate must it is closely connected, to give full play to rubbing action between the two.It is vertical that 7 vertical height of strip sliding slot controls friction energy-dissipating
2 maximum deformation quantity of beam, width are slightly larger than 8 diameter of high-strength bolt.As shown in fig. 6, the settable increasing resistance saw in 7 edge of strip sliding slot
Tooth, increases the drag of friction energy-dissipating stringer 2, and shape, size and the spacing of sawtooth should be tested before implementing, it is ensured that play requirement
Increasing resistance effect.
As Figure 8-9, steelframe 1 and when assembled friction energy-dissipating stringer 2, by bolt by upper load-bearing body 4 and top bar steel
1 connector of frame is fixed together, and lower load-bearing part 5 is fixed together with 1 connector of steelframe of getting out of a predicament or an embarrassing situation.14 joint welding of reinforced mesh is in two sides steel
Frame 1 leans on the inside of country rock side wing edge, and 9 both ends of longitudinal screw reinforcing bar are welded on the wing plate of steelframe 1, and when welding is considered as overlap joint one
Measured length guarantees to be connected firmly.
It as shown in Figure 16 and Figure 17, can be according to requirement of engineering, by being added on load-bearing part 5 lower in friction energy-dissipating stringer 2
High strong spring 11 or U-shaped elastic slice 12 occur centainly to deform and realize that level-one allows after change in friction energy-dissipating stringer 2, and upper load-bearing body 4 supports upper
High strong spring 11 or U-shaped elastic slice 12 are superimposed its elastic resistance and realize that second level allows change.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of spray based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, which is characterized in that including steelframe (1),
Friction energy-dissipating stringer (2), gunite concrete (3), reinforced mesh (14), longitudinal screw reinforcing bar (9) and circumferential spiral (10),
The steelframe (1) is formed by fashioned iron clod wash, the friction energy-dissipating stringer (2) by using channel steel make upper load-bearing body (4) and under
Load-bearing part (5) is constituted, and bolt hole (6) are arranged on the wing plate of upper load-bearing body (4), and setting strip is sliding on the wing plate of lower load-bearing part (5)
Slot (7) is connected between upper load-bearing body (4) and lower load-bearing part (5) by high-strength bolt (8), upper load-bearing body (4) and lower load-bearing part (5)
Web on prepared screw-bolt hole (6), to be bolted with steelframe (1)；Gunite concrete (3) between two Pin steelframes (1)
Longitudinal screw reinforcing bar (9) and circumferential spiral (10) are inside added, longitudinal screw reinforcing bar (9) and circumferential spiral (10) are intersected
Place's binding, longitudinal screw reinforcing bar (9) both ends are welded on steelframe (1), and circumferential spiral (10) both ends are welded on friction energy-dissipating
On the upper load-bearing body (4) and lower load-bearing part (5) of stringer.
2. the spray according to claim 1 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In the steelframe (1) is the grid steel frame of different model profile steel frame or reinforcement fabrication.
3. the spray according to claim 1 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In strip sliding slot (7) the edge setting on lower load-bearing part (5) wing plate increases resistance sawtooth.
4. the spray according to claim 1 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In the upper load-bearing body (4) is oppositely positioned, and constitutes friction energy-dissipating stringer (2) with lower load-bearing part (5).
5. the spray according to claim 1 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In, the longitudinal screw reinforcing bar (9) being arranged between two Pin steelframes (1) and circumferential spiral (10), longitudinal and circumferential minimum reinforcements
Rate is not less than 0.2%, and two-way whole steel bar stress minimum steel ratio is not less than 0.4%.
6. the spray according to claim 1 or 4 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, it is special
Sign is that the upper load-bearing body (4) and lower load-bearing part (5) are consumed using with model channel steel, the overlapping composition that the two wing plate is staggered rubs
It can stringer (2).
7. the spray according to claim 6 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In high strong spring (11) are arranged between the upper load-bearing body (4) and lower load-bearing part (5).
8. the spray according to claim 6 based on friction energy-dissipating stringer is mixed-steelframe integrally allows change just branch structure, feature exists
In U-shaped elastic slice (12) are arranged between the upper load-bearing body (4) and lower load-bearing part (5).
9. a kind of spray based on friction energy-dissipating stringer is mixed-steelframe integrally allows the construction method for becoming just branch structure, concrete operation step
Are as follows:
1), steelframe (1) and friction energy-dissipating stringer (2) production: by Tunnel Design size cold-rolled forming section production steelframe (1), upper carrying
Bolt hole (6) are set on the wing plate of part (4), strip sliding slot (7) are set on the wing plate of lower load-bearing part (5), upper load-bearing body (4) and under
It is assembled into friction energy-dissipating stringer (2) between load-bearing part (5) by high-strength bolt (8), upper load-bearing body (4) and lower load-bearing part (5)
On open up bolt hole (6), connect with steelframe (1) connector by high-strength bolt (8), and carry out trying spelling and inspection outside hole；
2) after the completion of, tunnel top bar (15) is excavated, gunite concrete (3) just are sprayed, first remove friction energy-dissipating before erecting steelframe (1)
The empty slag and sundries of stringer (2) installation site, friction energy-dissipating stringer (2) is placed in firm foundations, top bar steelframe (1) with
The upper load-bearing body (4) of friction energy-dissipating stringer (2) is connected by high-strength bolt (8), and friction energy-dissipating stringer passes through connecting plate between (2)
(13) weld together, form longitudinally through beam, reinforced mesh (14) joint welding is in two sides steelframe (1) by the interior of country rock side wing edge
Side；
3) longitudinal screw reinforcing bar (9) and circumferential spiral (10), are installed, longitudinal screw reinforcing bar (9) both ends are welded on steelframe (1)
On, circumferential spiral (10) both ends are welded on the upper load-bearing body (4) and lower load-bearing part (5) of friction energy-dissipating stringer；
4), spray gunite concrete (3) again, when multiple pneumatically placed concrete, should be reserved at friction energy-dissipating stringer (2) wouldn't pneumatically placed concrete,
The covering of remaining part position gunite concrete, gunite concrete (3) answers the bottomed surface for filling up upper load-bearing body (4), sufficiently to transmit pressure
Power；
5) it, excavates and gets out of a predicament or an embarrassing situation (16), first pneumatically placed concrete (3) after-frame is made step steelframe (1), steelframe (1) and friction energy-dissipating stringer
(2) lower load-bearing part (5) is connected by high-strength bolt (8)；
6) it, with step 3) installation longitudinal screw reinforcing bar (9) and circumferential spiral (10), answers pneumatically placed concrete (3), infuses with step 4)
Covering friction energy-dissipating stringer (2) should be avoided when meaning gunite concrete；
7) it after, monitoring surrouding rock deformation is stablized, is consumed by fastening the high-strength bolt (8) on the inside of tunnel on strip sliding slot (7) and rubbing
Rapid hardening expansive concrete can be infused to lock deformation in stringer (2)；
8), surrouding rock deformation is stable or after allowing and becoming device closure, and full concrete is sprayed at reserved position.
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| CN109723460A (en) * | 2019-01-15 | 2019-05-07 | 西南交通大学 | A deformation control support structure suitable for large deformation of tunnel |
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| CN111255489A (en) * | 2020-01-20 | 2020-06-09 | 西南交通大学 | Stride active fault tunnel antidetonation anti-fault-breaking primary support structure |
| CN112324472A (en) * | 2020-11-21 | 2021-02-05 | 中铁一局集团有限公司 | Tunnel steel frame supporting structure and construction method |
| CN113339005A (en) * | 2021-06-07 | 2021-09-03 | 中铁工程装备集团有限公司 | Tunnel primary support spraying and mixing structure and horizontal construction method thereof |
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| CN113339005A (en) * | 2021-06-07 | 2021-09-03 | 中铁工程装备集团有限公司 | Tunnel primary support spraying and mixing structure and horizontal construction method thereof |
| CN113339005B (en) * | 2021-06-07 | 2022-03-15 | 中铁工程装备集团有限公司 | Tunnel primary support spraying and mixing structure and horizontal construction method thereof |
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