CN104806253B - A kind of construction method punched between rectangular top pipe passage - Google Patents
A kind of construction method punched between rectangular top pipe passage Download PDFInfo
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- CN104806253B CN104806253B CN201510246989.9A CN201510246989A CN104806253B CN 104806253 B CN104806253 B CN 104806253B CN 201510246989 A CN201510246989 A CN 201510246989A CN 104806253 B CN104806253 B CN 104806253B
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- 238000010276 construction Methods 0.000 title claims abstract description 112
- 238000007710 freezing Methods 0.000 claims abstract description 164
- 230000008014 freezing Effects 0.000 claims abstract description 164
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- 230000008569 process Effects 0.000 claims abstract description 20
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 16
- 239000004567 concrete Substances 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 13
- 239000011378 shotcrete Substances 0.000 claims description 12
- 239000012267 brine Substances 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 11
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- 238000009413 insulation Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
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- 229910000831 Steel Inorganic materials 0.000 claims description 4
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- 238000004321 preservation Methods 0.000 claims description 3
- 238000013316 zoning Methods 0.000 claims description 3
- 241000537371 Fraxinus caroliniana Species 0.000 claims description 2
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims 2
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- 230000001105 regulatory effect Effects 0.000 claims 1
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- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000003449 preventive effect Effects 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 24
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- 238000010586 diagram Methods 0.000 description 3
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- 238000004080 punching Methods 0.000 description 3
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- 239000007921 spray Substances 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 206010061619 Deformity Diseases 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
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- 230000000171 quenching effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
-
- 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
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of rectangular top pipe construction technology.The construction method punched between the rectangular top pipe passage of the present invention, including step: preparation of construction；Freezing hole construction；Freezing Station is installed；Actively freeze to freeze with maintenance；Excavation and construction；Freezing hole blocks；Thaw settlement grouting.By the layout of freezing hole and freezing hole construction process are set preventive measure, it is ensured that construction safety and construction effect；For excavation and the construction of service channel, use the mode earth excavation that layering, piecemeal cut, it is ensured that the structural stability after Freezing Method for Cross-passage Construction, little to surrounding structure damaging；Freezing Method for Cross-passage Construction utilizes the push pipe passage reserved injected hole of both sides and roof and floor that punches to carry out thaw settlement grouting after completing, control surface subsidence and malformation；This construction method solves the construction problem punched between rectangular top pipe passage, its work progress safely, the channel design outputed reliable and stable, and efficiency of construction is high.
Description
Technical field
The present invention relates to a kind of push pipe passage construction technology, particularly to the construction punched between a kind of rectangular top pipe passage
Method.
Background technology
Jacking construction is a kind of non-excavating construction method, and it refers to a kind of excavation or the piping laying construction of few excavation
Technology.Construction by pipeline jacking method is the top power produced by means of jacking device in working pit, overcomes the friction of pipeline and surrounding soil
Power, is headed into pipeline in soil by the gradient of design, and the earthwork is transported.After one length of tubing completes to head into soil layer, more lower second
Length of tubing continues jacking.Its principle is by mean of main top oil cylinder and the thrust such as pipeline enclosure, relay well, tool pipe or development machine from
Sling in being advanced to receive hole through soil layer in working pit always.After pipeline follows tool pipe or development machine closely, be embedded in two holes it
Between.
Push pipe passage is not enough for urban land resource, traffic heavy congestion, and road passage capability can not meet city and send out
During exhibition demand, can use as a kind of Urban Underground Passage.And stratum residing for city underground engineering is mainly silty sand ground, ground
The layer water yield is enriched, good water permeability, and belongs to the arenaceous stratum of serious liquefaction so that the interconnective construction of push pipe interchannel becomes
Extremely difficult, many push pipe passages all can only be individually present, and push pipe interchannel is not connected with each other, and is intended only as single " tunnel
Road " exist, it is impossible to play preferably driving, the function of pedestrian.
Summary of the invention
It is an object of the invention to overcome stratum, Urban Underground push pipe passage place to be mainly silty sand ground, the stratum water yield is rich
Rich, good water permeability, and belong to the arenaceous stratum of serious liquefaction so that the interconnective construction of push pipe interchannel becomes extremely to be stranded
Difficult, it is impossible to the problem playing the preferably function of driving, pedestrian, it is provided that the construction party punched between a kind of rectangular top pipe passage
Method, for solving the construction that punches between the aqueous abundant and silty sand ground stratum rectangular top pipe passage of good water permeability, the method is executed
Work process safety, the channel design outputed are reliable and stable, and efficiency of construction is high.
In order to realize foregoing invention purpose, the invention provides techniques below scheme:
The construction method punched between a kind of rectangular top pipe passage, comprises the following steps:
(1) preparation of construction: to the Rock Conditions, hydrogeologic condition and the periphery pipeline that prepare near the rectangular top pipe of construction
Situation does corresponding understanding, carries out the position planning opening service channel between rectangular top pipe passage；
(2) freezing hole construction: open freezing hole with diamond core drill on rectangular top pipe inwall, freeze by pipe-following drilling FAXIA
Knot pipe, according to the position, hole of Freezing Method for Cross-passage Construction, uses order from bottom to top to construct；It is designed with at each drilling orifice
Orifice tube, and boring sealing device is installed；When generation emits mud retention of excessive fluid phenomenon during construction freezing hole, strength level is used to bore
Machine, realizes without mud drilling as far as possible；If occurring that muddy water runs off during boring, carry out in time mending slurry filling；
(3) Freezing Station is installed: Freezing Station is arranged on termination, ground well location and puts, and Freezing Station equipment includes freezing unit, salt
Water tank, brine pump, clarified water pump, cooling tower and control cabinet for power distribution, connect each equipment with pipeline, uses freezing unit by freezing
Liquid is squeezed into and is carried out freezing soil construction in freezing pipe；Actively freezing period chilled liquid temperature is-28 DEG C～-30 DEG C, safeguards freezing period
Temperature is-25 DEG C～-28 DEG C；Chilling requirement calculates and fridge type selecting: freezes chilling requirement and calculates: Q=1.3 π d H K, its
Middle H freezing hole total length, d freezing pipe diameter, K freezing pipe coefficient of heat transfer, according to chilling requirement to fridge type selecting；
(5) excavation and construction: after possessing excavation condition, reserved service channel is carried out accurate setting-out, carry out line position
Labelling, uses the mode earth excavation that unilateral manual zoning, piecemeal cut；First excavate the half region on upper strata, excavated
Falsework and gunite concrete are installed after one-tenth in time；Excavation upper strata remaining area and lower region the most successively, and install in time
Falsework and gunite concrete；Last property integrated poured secondary lining permanent structure；
(6) freezing hole closure: freezing hole closure is carried out after secondary permanent structure form removal, and freezing pipe is not extracted, and uses
Cutting off process, and close the mouth of pipe with Plate Welding, each freezing pipe blocks freezing hole after cutting off at once；
(7) thaw settlement grouting: utilize the push pipe passage reserved injected hole of both sides and roof and floor that punches to carry out thaw settlement grouting, thaw collapse
Slip casting is based on the cement grout of single liquid, and dual slurry is auxiliary mode, carries out the thaw settlement grouting on stratum.
As preferably, in step (2) work progress, strict monitoring slanting of freezing hole situation, finds that deflection to be rectified a deviation in time,
Under after good freezing pipe, carry out the repetition measurement of freezing pipe length, carry out deviational survey with Inclination Measurement by Light instrument the most again and draw hole scattering figure.
As preferably, freezing pipe selects φ 89*5mm and φ 45*3.5mm low-carbon (LC) seamless steel pipe, and freezing pipe is pressure to be not less than
0.8Mpa, and be not less than and freeze 1.5 times of work surface brine pressure, freezing pipe joint tensile strength is not less than the 75% of female pipe.
As preferably, according to the position, hole of Freezing Method for Cross-passage Construction, order from bottom to top is used to construct, freezing hole perforate
Site error is not more than 100mm, should avoid joints of segment, dark beam and sleeper.So can prevent because the construction of lower floor's freezing hole is drawn
Play upper formation disturbance, reduce accident rate during drilling construction.
As preferably, in drill process, soil body loss volume cannot be greater than freezing hole volume, and each freezing hole has been holed
After, in time by injected hole, stratum compensated slip casting (carrying out pressure injection by 2 ~ 3 times of volumes), it is ensured that surface subsidence is controlled；Freeze
Knot length of tube and deflection qualified after carry out suppressing leak test again, Stress control is at 0.8MPa, it is desirable to little the first 15 minutes pressure losses
In 0.05MPa, in 30 minutes afterwards, pressure stability is that pressure testing is qualified time unchanged.If pressure testing is defective, freezing pipe can be extracted and enter
Row redrilling, or setting of casing processes.
As preferably, step (3) arranges valve, temperature measurer, Pressure gauge in saline line and cooling water circulation pipeline
Deng test suite；Saline line is incubated with warming plate or cotton-wool after leak test, cleaning, and insulation thickness is 20mm, outside heat-insulation layer
Face plastic sheeting is wrapped up.Collection brine distributing ring and the connection high-pressure rubber pipe of freezing pipe, often organize import and export each dress valve of freezing pipe
One, in order to control flow.PEF plate heat-insulation and heat-preservation is used, to reduce loss of refrigeration capacity outside tube coupling.
As preferably, in step (4), equipment carries out debugging and test running after installing.When test running, adjust at any time
Joint each state parameter such as pressure, temperature, makes unit run under the conditions of the technical parameter of congealing process code and equipment requirements.Freeze
Clone system enters after working well and actively freezes.
In positive freezing process, to judge whether freezing curtain is handed over circle and reach design thickness according to observed temperature data
Degree, the cementing situation of freezing curtain to be monitored and passage, thermometric judge freezing curtain hand over enclose and reach design thickness and with
After passage is the most cementing, can enter maintenance and freeze the stage, safeguard that freezing period temperature is-25 DEG C～-28 DEG C, freeze-off time runs through other
Ground settlement and tunnel and main structure construction are all the time.
As preferably, in step (5), service channel longitudinal direction degree of depth 0.5m is taked disposably to have excavated, and excavated section is backbreak
It is not more than 30mm, it is desirable to after each excavation in zones has excavated, freezing curtain open-assembly time is not more than 12 hours.
As preferably, in step (5), soil body both sides carry out artificial pneumatic pick excavation, and the middle soil body not freezed uses pickaxe
Excavate with spade；In digging process, bottom will have part freezing pipe to be exposed, and first need to close the going of this group freezing pipe, return valve
Door, cuts off internal saline emptying again.In order to improve drivage efficiency, accelerating construction progress, shorten frozen soil open-assembly time,
Pneumatic pick point need to do Quenching Treatment.And tunneling ambient temperature below 0 DEG C, the condensed water in wind conveying pipe road and pneumatic pick is easily tied
Ice, need to carry out dehumidification treatments, on the one hand airduct suspention is got up, and additionally injected ethanol in airduct every 1～2 hour, prevents
The appearance of ice bits.And require well matched standby 5～6 pneumatic picks of each driving, to avoid irregular working to affect construction speed.In pick
Enter the consolidation effect according to the exposure soil body in construction, and purpose monitoring information, adjust excavation step pitch and supporting intensity in time, really
Ensure safety construction.In digging process, also want in time the freezing curtain exposed to be incubated.Ensure that the safety of work progress
With the construction effect of service channel, improve efficiency of construction.
As preferably, step (6) is cut off a freezing pipe one freezing hole of closure the most in time, forbids several freezing pipes
Cut off together, block together.
As preferably, in step (7), cement grout is cement list slurry, and water ash mass ratio is water: cement=1:1.Slip casting
Pressure is not more than 0.3MPa, when internal channel sedimentation in a day is more than 0.5mm, or when the accumulative sedimentation of passage is more than 1.0mm, should melt
Heavy compensation and grouting；Slip casting should be suspended as passage protuberance 2.0mm;Solum settlement relative with surrounding soil layer stable after, can terminate
Thaw settlement grouting.
As preferably, in step (7), slip casting is with on a small quantity repeatedly as principle, and single hole once grouting amount is not more than 0.5 m3, note
Slurry pressure is not more than 0.3Mpa.To treat that the Grouting Pipe of slip casting and its adjacent Grouting Pipe valve are fully open before slip casting；Slip casting
Cheng Zhong, closes adjacent ports valve door, quantitatively can stop this hole slip casting after the single slurry of press-in, close valve closing when the continuous pulp of adjacent holes
Door, is then followed by adjacent hole slip casting.When altering slurry consolidation in running into Grouting Pipe and cause plugging, need to be with lengthening drill hammer siphunculus.
According to surface subsidence and structural deformation monitoring situation, the Reasonable adjustment organization of labour, carry out repeatedly slip-casting in good time, until
Sinking deformation monitoring is basicly stable, and reach structure without substantially infiltration till.
Control surface subsidence and malformation are the purposes of slip casting.Therefore, in course of defrosting, supervise by facial disfigurement intentinonally
Water And Earth Pressures monitoring after survey, frozen soils temperature monitoring, frost wall.It addition, during mortar depositing construction, the pressure of serosity can pass through
Adjacent injected hole is installed Pressure gauge and is reflected.Above comprehensive monitoring data, are the foundations of grouting parameter adjustment.The knot of thaw settlement grouting
Bundle is to stabilize to foundation with ground deformation.Frost wall the most all melts, and the lasting month every first quarter moon of actual measurement stratum settlement is little
In 0.5mm, thaw collapse compensation and grouting can be stopped.
Compared with prior art, beneficial effects of the present invention:
1, the construction method punched between this rectangular top pipe passage, by the layout of freezing hole and freezing hole construction process
All do corresponding preventive measure, it is ensured that construction safety and construction effect；For excavation and the construction of service channel, adopt
The mode earth excavation cut with layering, piecemeal, a part is timely after having excavated installs falsework and gunite concrete,
Rear disposable integrated poured secondary lining permanent structure, it is ensured that the stability after Freezing Method for Cross-passage Construction, damages surrounding formation structure
Bad little；Freezing Method for Cross-passage Construction utilizes the push pipe passage reserved injected hole of both sides and roof and floor that punches to carry out thaw settlement grouting after completing,
Control surface subsidence and malformation；This construction method solves the construction problem punched between rectangular top pipe passage, and it was constructed
Cheng Anquan, the channel design outputed are reliable and stable, and efficiency of construction is high；
2, during freezing hole construction, at each drilling orifice, it is designed with orifice tube, and boring sealing device is installed, can prevent
When creeping into, a large amount of water, blowout go out；Produce during for construction freezing hole and emit mud retention of excessive fluid phenomenon, use strength horizontal drill, the most real
Now without mud drilling；Occur during boring that muddy water runs off, carry out in time mending slurry filling；So water during the construction of construction energy control freezing hole
Soil runs off, and reduces the impact on surrounding enviroment to greatest extent；
3, service channel earth excavation follows the principle of " from top to bottom, hierarchical block ", " early spray anchor, close soon " when removing,
First excavate the half region on upper strata, falsework and gunite concrete are installed in time, it is ensured that construction safety after having excavated；Depend on again
Secondary excavation upper strata remaining area and lower region, and falsework and gunite concrete are installed in time；Last property entirety is watered
Note secondary lining permanent structure；Work progress is orderly, improves efficiency of construction.
Accompanying drawing illustrates:
Fig. 1 is the construction process figure of the construction method punched between the rectangular top pipe passage of the present invention.
Fig. 2 is the construction location relation schematic diagram punched between the rectangular top pipe passage of the present invention.
Fig. 3 is the A-A view in Fig. 2.
Fig. 4 is the schematic diagram opening freezing hole in rectangular top pipe.
Fig. 5 is Freezing Method for Cross-passage Construction schematic diagram between rectangular top pipe.
Fig. 6 is service channel excavation and construction flow chart.
Labelling in figure: 1-starting well, 2-rectangular top pipe, 3-service channel, 4-received well, 5-rectangular top pipe passage, 6-freezes
Knot hole, 7-pressure relief vent, 8-thermometer hole.
Detailed description of the invention
Below in conjunction with test example and detailed description of the invention, the present invention is described in further detail.But this should not understood
Scope for the above-mentioned theme of the present invention is only limitted to below example, and all technology realized based on present invention belong to this
The scope of invention.
Embodiment 1
The present embodiment, as a example by the construction of somewhere Subway Tunnel service channel, is opened between the rectangular top pipe passage of the present invention
The construction method in hole illustrates.
As in figure 2 it is shown, be provided with the separate rectangular push pipe that three rectangular top pipes 2 are formed between starting well 1 and received well 4
Passage 5, is now intended to get through three rectangular top pipe passages 5, as it is shown on figure 3, the rectangular top pipe interchannel after getting through establishes contact
Passage 3, the construction method punched between the rectangular top pipe passage of the present embodiment, comprise the following steps:
(1) preparation of construction: to the Rock Conditions, hydrogeologic condition and the periphery pipeline that prepare near the rectangular top pipe of construction
Situation does corresponding understanding, carries out and opens the position of service channel and the planning of other parameters between rectangular top pipe passage；Analyze
Prepare rock stratum attribute and the stratum water content situation of construction surrounding formation, carry out corresponding preparation of construction, it is to avoid affect Zhou Bianhuan
Border safety；
(2) freezing hole construction: open freezing hole with diamond core drill on rectangular top pipe inwall, freeze by pipe-following drilling FAXIA
Knot pipe, according to the position, hole of Freezing Method for Cross-passage Construction, uses order from bottom to top to construct；As shown in Figure 4, the freezing of the present embodiment
Knot hole 6 is arranged in the four sides of rectangular top pipe conduit wall, is divided into the horizontal frozen hole being arranged on rectangular top tube wall, is arranged on rectangle
Vertical freezing hole, rectangular top tube wall and top board, the inclination freezing hole of back plate connections on push pipe top board and base plate；
At each drilling orifice, it is designed with orifice tube, and boring sealing device is installed, a large amount of water, blowout when preventing from creeping into
Go out；Produce during for construction freezing hole and emit mud retention of excessive fluid phenomenon, use strength horizontal drill, it is achieved without mud drilling；If during boring
Occur that muddy water runs off, carry out in time mending slurry filling；
(3) Freezing Station is installed: Freezing Station is arranged on termination, ground well location and puts, and Freezing Station equipment includes freezing unit, salt
Water tank, brine pump, clarified water pump, cooling tower and control cabinet for power distribution, connect each equipment with pipeline, uses freezing unit by freezing
Liquid is squeezed into and is carried out freezing soil construction in freezing pipe；
(4) actively freeze to freeze with maintenance: actively freezing period chilled liquid temperature is-28 DEG C～-30 DEG C, safeguards freezing period temperature
Degree is for-25 DEG C～-28 DEG C；Chilling requirement calculates and fridge type selecting: freezes chilling requirement and calculates: Q=1.3 π d H K, wherein
H freezes total length, d freezing pipe diameter, and K freezing pipe coefficient of heat transfer, according to chilling requirement to fridge type selecting；
(5) excavation and construction: after possessing excavation condition, reserved service channel is carried out accurate setting-out, carry out line position
Labelling, uses the mode earth excavation that unilateral manual zoning, piecemeal cut；First excavate the half region on upper strata, excavated
Falsework and gunite concrete are installed after one-tenth in time；Excavation upper strata remaining area and lower region the most successively, and install in time
Falsework and gunite concrete；Last property integrated poured secondary lining permanent structure；As it is shown in figure 5, service channel 3 is executed
Work point is that 4th district cut, and follows the principle of " from top to bottom, hierarchical block ", " early spray anchor, close soon ", first when cutting
Excavate I subregion, falsework and gunite concrete are installed after having excavated in time；Excavate II, III, IV subregion the most successively, and and
Time falsework and gunite concrete are installed；Last property integrated poured secondary lining permanent structure；
Being the situation of reinforced concrete structure for service channel to be excavated, service channel structure needs first to reinforcing bar before constructing
Concrete tube coupling cuts.Therefore how to control vibration effect when armored concrete cuts, and the deformation of tube coupling after punching
Impact, as it is shown in figure 5, the present embodiment is before service channel punches construction, offers 4 horizontal thermometer holes 8 in the range of punching, and sees
Survey the frozen soils temperature of the soil body, it is desirable to reach less than-10 DEG C of design code；
When the tube coupling that punches cuts, it then follows " from top to bottom, hierarchical block " and the principle of " early spray anchor, soon closing ", the most first general
After piecemeal position, the tube coupling top layering that punches cuts, carry out spraying anchor immediately or Plate Welding is closed, carry out again after having closed
Next piecemeal cut operation, thus reduce the disturbing influence to tube coupling；
In whole work progress, strengthen, to frozen construction parameter and the monitoring frequency of malformation, adjusting according to Monitoring Data
Homogeneous tube joint cuts time and order；If malformation is excessive, with gunite concrete, face should be carried out sealing treatment immediately,
After carrying out pre-pouring grout reinforcing if desired, then carry out punching that tube coupling is remaining cuts operation；
(6) freezing hole closure: freezing hole closure is carried out after secondary permanent structure form removal, and freezing pipe is not extracted, and uses
Cut off process, and close the mouth of pipe with Plate Welding, cut off a freezing pipe one freezing hole of closure the most at once, forbid to freeze several
Knot hole is cut off together, blocks together；
(7) thaw settlement grouting: utilize the push pipe passage reserved injected hole of both sides and roof and floor that punches to carry out thaw settlement grouting, thaw collapse
Slip casting is based on the cement grout of single liquid, and dual slurry is auxiliary mode, carries out the thaw settlement grouting on stratum；
When and top buried depth less for adjacent rectangle push pipe interchannel clear distance is deep, need to consider above rectangular top pipe
Pipeline arrange, it is necessary to when reducing frozen construction, the frozen swell and melt settlement of shaping channel structure and upper pipeline thereof is affected, for
These situations can use quick freezing to reduce frost heave, if desired freezing range is carried out front pre-grouting；Because shallow soil layer freezes
Body volume is the least, and under conditions of quick freezing, the frost heave of generation is the least.
For ensureing engineering safety and quality thereof, set up inclination thermometer hole on rectangular top pipe top, by temperature measurement data analysis,
Judge to freeze to hand over circle and the development of freezing curtain thereof, thus adjust and freeze the body speed of development, and then play restriction frozen soil body of wall
The long-pending effect upwards developed；
As it is shown in figure 5, service channel punch both sides lay two pressure relief vents 7, according to pressure relief vent 7 upward pressure meter reading become
Change, discharge frost-heaving force in advance, reduce the frost heave impact on jacking pipe joints；
Pre-buried madjack pipe in service channel lining cutting, uses tracking grouting mode to compensate soil layer thaw collapse, but grouting amount and pressure
Power must be adjusted according to monitoring measurement feedback data.
In the present embodiment, in step (2) work progress, strict monitoring slanting of freezing hole situation, finds that deflection to be entangled in time
Partially, after lower good freezing pipe, carry out the repetition measurement of freezing pipe length, carry out deviational survey with Inclination Measurement by Light instrument the most again and draw hole scattering
Figure.
In the present embodiment, freezing pipe selects φ 89*5mm and φ 45*3.5mm low-carbon (LC) seamless steel pipe, and it is the lowest that freezing pipe is pressure
In 0.8Mpa, and being not less than and freeze 1.5 times of work surface brine pressure, freezing pipe joint tensile strength is not less than female pipe
75%.So, freeze chilling requirement calculate: Q=1.3 π d H K, wherein H freezing hole total length: Φ 89mm=102.5m and
Φ 45mm=448m, d freezing pipe diameter: Φ 89mm and Φ 45mm, K freezing pipe coefficient of heat transfer 250～280 Kcal/m2h:
So calculating chilling requirement is 3.17 × 104 Kcal/h, according to chilling requirement, service channel selects JYSLGF-300II
Type Screw chiller one set, single unit design conditions refrigerating capacity is 8.75 × 104 Kcal/h, power of motor 110KW, completely
Meet refrigeration demand.Selecting J-200 type diamond drill, join φ 130mm diamond core bit and hole, the degree of depth is about
320mm, control must not drill tube coupling；
In the present embodiment, according to the position, hole of Freezing Method for Cross-passage Construction, using order from bottom to top to construct, freezing hole is opened
Hole site error is not more than 100mm, should avoid joints of segment, dark beam and sleeper.So can prevent because of the construction of lower floor's freezing hole
Cause upper formation disturbance, reduce accident rate during drilling construction.
In the present embodiment, in drill process, soil body loss volume cannot be greater than freezing hole volume, and each freezing hole has been holed
Cheng Hou, in time compensates slip casting (carrying out pressure injection by 2 ~ 3 times of volumes) by injected hole, it is ensured that surface subsidence is controlled to stratum；
Freezing pipe length and deflection qualified after carry out suppressing leak test again, Stress control was at 0.8MPa, it is desirable to the first 15 minutes pressure losses
Less than 0.05MPa, in 30 minutes afterwards, pressure stability is that pressure testing is qualified time unchanged.If pressure testing is defective, freezing pipe can be extracted
Carry out redrilling, or setting of casing processes.
In the present embodiment, step (3) arranges valve, temperature measurer, pressure in saline line and cooling water circulation pipeline
The test suites such as table；Saline line is incubated with warming plate or cotton-wool after leak test, cleaning, and insulation thickness is 20mm, heat-insulation layer
Outside plastic sheeting is wrapped up, collection brine distributing ring and the connection high-pressure rubber pipe of freezing pipe, often organizes import and export each dress valve of freezing pipe
One, door, in order to control flow.PEF plate heat-insulation and heat-preservation is used, to reduce loss of refrigeration capacity outside tube coupling.
In the present embodiment, in step (4), equipment carries out debugging and test running after installing.When test running, be at any time
Regulation each state parameter such as pressure, temperature, makes unit run under the conditions of the technical parameter of congealing process code and equipment requirements.
Freezing system enters after working well and actively freezes.
In positive freezing process, to judge whether freezing curtain is handed over circle and reach design thickness according to observed temperature data
Degree, the cementing situation of freezing curtain to be monitored and passage, thermometric judge freezing curtain hand over enclose and reach design thickness and with
After passage is the most cementing, can enter maintenance and freeze the stage, safeguard that freezing period temperature is-25 DEG C～-28 DEG C, freeze-off time runs through other
Ground settlement and tunnel and main structure construction are all the time.
Such as figure, shown in 6, excavation and construction flow chart, the service channel longitudinal direction degree of depth in step (5) in the present embodiment
0.5m takes disposably to have excavated, and excavated section is backbreak no more than 30mm, it is desirable to after each excavation in zones has excavated, freeze
Curtain open-assembly time is not more than 12 hours.
In the present embodiment, in step (5), soil body both sides carry out artificial pneumatic pick excavation, and the middle soil body not freezed uses hands
Pick and spade excavation；In digging process, bottom will have part freezing pipe to be exposed, and first need to close the going of this group freezing pipe, loop
Valve, cuts off internal saline emptying again.In order to improve drivage efficiency, accelerating construction progress, when shortening frozen soil exposure
Between, pneumatic pick point need to do Quenching Treatment.And tunneling ambient temperature below 0 DEG C, the condensed water in wind conveying pipe road and pneumatic pick is easy
Freeze, dehumidification treatments need to be carried out, on the one hand airduct suspention is got up, additionally in airduct, injected ethanol every 1～2 hour, anti-
The appearance of stagnant ice bits.And require well matched standby 5～6 pneumatic picks of each driving, to avoid irregular working to affect construction speed.?
According to disclosing the consolidation effect of the soil body in tunneling construction, and purpose monitoring information, adjust excavation step pitch and supporting intensity in time,
Guarantee safe construction.In digging process, also want in time the freezing curtain exposed to be incubated.
In the present embodiment, step (6) is cut off a freezing pipe one freezing hole of closure the most in time, forbids to freeze several
Pipe cuts off together, blocks together.
In the present embodiment, in step (7), cement grout is single slurry, and the ratio of mud is water: cement=1:1.Grouting pressure is not
More than 0.3MPa, when internal channel sedimentation in a day is more than 0.5mm, or when the accumulative sedimentation of passage is more than 1.0mm, thaw collapse compensation should be carried out
Slip casting；Slip casting should be suspended as passage protuberance 2.0mm;Solum settlement relative with surrounding soil layer stable after, thaw collapse note can be terminated
Slurry.
In the present embodiment, in step (7), slip casting is with on a small quantity repeatedly as principle, and single hole once grouting amount is not more than 0.5 m3,
Grouting pressure is not more than 0.3Mpa.To treat that the Grouting Pipe of slip casting and its adjacent Grouting Pipe valve are fully open before slip casting；Slip casting
During, close adjacent ports valve door when the continuous pulp of adjacent holes, quantitatively can stop this hole slip casting after the single slurry of press-in, close valve closing
Door, is then followed by adjacent hole slip casting.When altering slurry consolidation in running into Grouting Pipe and cause plugging, need to be with lengthening drill hammer siphunculus.
According to surface subsidence and structural deformation monitoring situation, the Reasonable adjustment organization of labour, carry out repeatedly slip-casting in good time, until
Sinking deformation monitoring is basicly stable, and reach structure without substantially infiltration till.
Control surface subsidence and malformation are the purposes of slip casting.Therefore, in course of defrosting, supervise by facial disfigurement intentinonally
Water And Earth Pressures monitoring after survey, frozen soils temperature monitoring, frost wall.It addition, during mortar depositing construction, the pressure of serosity can pass through
Adjacent injected hole is installed Pressure gauge and is reflected.Above comprehensive monitoring data, are the foundations of grouting parameter adjustment.The knot of thaw settlement grouting
Bundle, stabilizes to foundation with ground deformation, and frost wall the most all melts, and actual measurement stratum settlement continues month every first quarter moon and is not more than
0.5mm, can stop thaw collapse compensation and grouting.
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), unless chatted especially
State, all can be by other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, each feature is only
It it is an example in a series of equivalence or similar characteristics.
Claims (11)
1. the construction method punched between a rectangular top pipe passage, it is characterised in that comprise the following steps:
(1) preparation of construction: to the Rock Conditions, hydrogeologic condition and the periphery line conditions that prepare near the rectangular top pipe of construction
Do corresponding understanding, carry out the position planning punched；
(2) freezing hole construction: open freezing hole with diamond core drill on rectangular top pipe inwall, freeze by pipe-following drilling FAXIA
Pipe, according to the position, hole of Freezing Method for Cross-passage Construction, uses order from bottom to top to construct；It is designed with hole at each drilling orifice
Mouth pipe, and boring sealing device is installed；When generation emits mud retention of excessive fluid phenomenon during construction freezing hole, use strength horizontal drill,
Realize without mud drilling；If occurring that muddy water runs off during boring, carry out in time mending slurry filling；Cloth at each tube coupling that punches of freezing pipe
Putting 3 ~ 4 thermometer holes, 1 ~ 2 thermometer hole is respectively arranged in the both sides that punch, and thermometer hole sum is not less than 3；
(3) Freezing Station is installed: Freezing Station is arranged on termination, ground well location and puts, Freezing Station equipment include freezing unit, brine tank,
Brine pump, clarified water pump, cooling tower and control cabinet for power distribution, connect each equipment with pipeline, uses freezing unit to be beaten by freezing liquid
Enter and freezing pipe carries out frozen construction；
(4) actively freeze to freeze with maintenance: actively freezing period brine temp be-28 DEG C～-30 DEG C, safeguard freezing period temperature be-
25 DEG C～-28 DEG C；Chilling requirement calculates and fridge type selecting: freezes chilling requirement and calculates: Q=1.3 π d H K, wherein H freezes
Knot hole total length, d freezing pipe diameter, K freezing pipe coefficient of heat transfer；
(5) excavation and construction: after possessing excavation condition, reserved service channel is carried out accurate setting-out, carry out line position labelling,
Use the mode earth excavation that unilateral manual zoning, piecemeal cut；First excavate the half region on upper strata, excavated after and
Time falsework and gunite concrete are installed；Excavation upper strata remaining area and lower region the most successively, and install interim in time
Frame and gunite concrete；Last property integrated poured secondary lining permanent structure；
(6) freezing hole closure: freezing hole closure is carried out after secondary permanent structure form removal, and freezing pipe is not extracted, and employing is cut off
Processing, and close the mouth of pipe with Plate Welding, single freezing pipe blocks freezing hole after cutting off at once；
(7) thaw settlement grouting: utilize the push pipe passage reserved injected hole of both sides and roof and floor that punches to carry out thaw settlement grouting, thaw settlement grouting
Based on the cement grout of single liquid, dual slurry is auxiliary mode, carries out the thaw settlement grouting on stratum.
The construction method punched between rectangular top pipe passage the most according to claim 1, it is characterised in that step (2) is executed
During work, strict monitoring slanting of freezing hole situation, finds that deflection to be rectified a deviation in time, after lower good freezing pipe, carries out freezing pipe length
Repetition measurement, carry out deviational survey with Inclination Measurement by Light instrument the most again and draw hole scattering figure.
The construction method punched between rectangular top pipe passage the most according to claim 1 and 2, it is characterised in that rectangular top
Both sides freezing pipe φ 89 × 5mm mild steel seamless steel pipe in pipe；Top, bottom freezing pipe with φ 45 × 3.5mm mild steel without
Seam steel pipe；Freezing pipe is pressure is not less than 0.8Mpa, and is not less than and freezes 1.5 times of work surface brine pressure.
The construction method punched between rectangular top pipe passage the most according to claim 3, it is characterised in that described freezing hole
Position, hole according to Freezing Method for Cross-passage Construction, uses order from bottom to top to construct, and freezing hole position of opening error is not more than
100mm, should avoid joints of segment, dark beam and sleeper.
The construction method punched between rectangular top pipe passage the most according to claim 4, it is characterised in that in drill process
Soil body loss volume cannot be greater than freezing hole volume, after each freezing hole has been holed, is carried out stratum by injected hole in time
Compensation and grouting；Freezing pipe length and deflection qualified after carry out suppressing leak test again, Stress control was at 0.8MPa, it is desirable at first 15 minutes
The pressure loss is less than 0.05MPa, and in 30 minutes afterwards, pressure stability is that pressure testing is qualified time unchanged.
The construction method punched between rectangular top pipe passage the most according to claim 1, it is characterised in that in step (3)
Saline line and cooling water circulation pipeline arrange valve, temperature measurer, Pressure gauge；Saline line is used after leak test, cleaning and is protected
Temperature plate or cotton-wool insulation, insulation thickness is 20mm, and the outside plastic sheeting of heat-insulation layer is wrapped up；Collection brine distributing ring and the company of freezing pipe
Connect with high-pressure rubber pipe, often organize one, import and export each dress valve of freezing pipe, outside tube coupling, use PEF plate heat-insulation and heat-preservation, to reduce
Loss of refrigeration capacity.
The construction method punched between rectangular top pipe passage the most according to claim 1, it is characterised in that in step (4)
Equipment carries out debugging and test running after installing；When test running, pressure, temperature to be regulated at any time, make unit freeze work
Running under the conditions of the technical parameter of skill code and equipment requirements, freezing system enters after working well and actively freezes.
The construction method punched between rectangular top pipe passage the most according to claim 7, it is characterised in that actively freezing
During, to judge whether freezing curtain is handed over circle and reach design thickness according to observed temperature data, to monitor simultaneously and freeze curtain
Curtain and the cementing situation of passage, thermometric judge freezing curtain friendship enclose and reach design thickness and the most cementing with passage after, can enter
Entering maintenance and freeze the stage, safeguard that freezing period temperature is-25 DEG C～-28 DEG C, freeze-off time runs through by-pass excavation and agent structure
Construction is all the time.
The construction method punched between rectangular top pipe passage the most according to claim 1, it is characterised in that in step (5)
Service channel longitudinal direction degree of depth 0.5m is taked disposably to have excavated, and excavated section is backbreak no more than 30mm, it is desirable to each excavation divides
After district has excavated, freezing curtain open-assembly time is not more than 12 hours.
The construction method punched between rectangular top pipe passage the most according to claim 9, it is characterised in that described contact
Passage soil at both sides carries out artificial pneumatic pick excavation, and the middle soil body not freezed uses pickaxe and spade excavation；In digging process
Bottom will have part freezing pipe to be exposed, and first need to close the outlet of this group freezing pipe and loop valve, and internal is freezed liquid
Emptying is cut off again.
The construction method punched between 11. rectangular top pipe passages according to claim 1, it is characterised in that in step (7)
The water ash mass ratio of cement grout is water: cement=1:1；Grouting pressure is not more than 0.3MPa, when internal channel sedimentation in a day is more than
0.5mm, or when the accumulative sedimentation of passage is more than 1.0mm, thaw collapse compensation and grouting should be carried out；Note should be suspended as passage protuberance 2.0mm
Slurry；Solum settlement relative with surrounding soil layer stable after, thaw settlement grouting can be terminated.
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| CN105862932B (en) * | 2016-04-30 | 2018-08-17 | 叶香竹 | Protect the structure of municipal pipeline |
| CN106014460A (en) * | 2016-06-14 | 2016-10-12 | 中铁隧道勘测设计院有限公司 | Incremental launching type underground space group construction method and application |
| CN108222949A (en) * | 2018-01-03 | 2018-06-29 | 上海市机械施工集团有限公司 | Passage construction structures and methods |
| CN109000963A (en) * | 2018-08-30 | 2018-12-14 | 广东水利电力职业技术学院（广东省水利电力技工学校） | A kind of plastic concrete cut-off wall sampling method |
| CN109409777A (en) * | 2018-11-16 | 2019-03-01 | 安徽国祯环境修复股份有限公司 | A kind of Groundwater Contamination Risk management-control method based on construction freezing method |
| CN110132347A (en) * | 2019-04-25 | 2019-08-16 | 中铁十二局集团有限公司 | The construction monitoring method in the tunnel based on frozen construction |
| CN110847151B (en) * | 2019-10-23 | 2021-07-06 | 河南城建学院 | Method for repairing tunnel underpass cavity by freezing method |
| CN111173536A (en) * | 2019-12-26 | 2020-05-19 | 中交一航局安装工程有限公司 | Freezing construction method for tunnel connection channel |
| CN112459799A (en) * | 2020-11-23 | 2021-03-09 | 张同勇 | Construction method of underground water supply pipeline |
| CN113404430A (en) * | 2021-05-27 | 2021-09-17 | 中国一冶集团有限公司 | Safe embedding method of freezing pipe |
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