CN108661671A - Tunnel vault two serves as a contrast concrete vacuum and assists pouring procedure - Google Patents
Tunnel vault two serves as a contrast concrete vacuum and assists pouring procedure Download PDFInfo
- Publication number
- CN108661671A CN108661671A CN201810469571.8A CN201810469571A CN108661671A CN 108661671 A CN108661671 A CN 108661671A CN 201810469571 A CN201810469571 A CN 201810469571A CN 108661671 A CN108661671 A CN 108661671A
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- concrete
- vault
- end head
- lining
- head formwork
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000009415 formwork Methods 0.000 claims abstract description 67
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000005728 strengthening Methods 0.000 claims abstract description 33
- 230000002787 reinforcement Effects 0.000 claims abstract description 26
- 238000009434 installation Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 239000000565 sealant Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 5
- 238000005345 coagulation Methods 0.000 claims description 5
- 230000010412 perfusion Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 2
- 230000007812 deficiency Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 25
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 206010057071 Rectal tenesmus Diseases 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000004540 pour-on Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 208000012271 tenesmus Diseases 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (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 provides a kind of tunnel vault two lining concrete vacuums to assist pouring procedure, belongs to technical field of tunnel construction, steps are as follows：Lining trolley is in place, installs end head formwork, exhaust pipe and concrete delivery pipe and seals, one end of vault template is contacted with the lining of completed vault two, the other end is connected with end head formwork, concrete delivery pipe above end head formwork is set to the top of concrete strengthening layer above vault template, is equipped with and the matched sealing ring of vault main reinforcement with the matched preformed hole inboard of vault main reinforcement on end head formwork；Exhaust pipe is connected to vacuum pump, concrete delivery pipe connection delivery pump carries out two lining concrete cast；End head formwork, vacuum pump and concrete delivery pipe are removed after concrete final set.Concrete is served as a contrast using supplementary means cast tunnel vault two is vacuumized, the common quality defects such as overcome arch crown part concrete cast thickness deficiency, structure variation, intensity low make tunnel vault portion structure stress more meet design idea, improve its bearing capacity.
Description
Technical field
The invention belongs to technical field of tunnel construction, are to be related to a kind of tunnel vault two to serve as a contrast concrete true more specifically
Sky auxiliary pouring procedure.
Background technology
With the fast development of Tunnel Engineering technology, splash guard+draining blind pipe is gradually promoted the use of from the nineties in last century
Technology makes tunnel vault leak be effectively controlled；Original arch+small is substituted using lining trolley+pumped concrete earth process
The arch-wall method technique of template+artificial loading realizes tunnel concrete two and serves as a contrast full section face rapid construction, and integrated construction quality obtains
To being substantially improved.
Lining trolley is made of removable supporting rack, vault template, side wall template and end head formwork etc., trolley design length
For 9m or 12m, vault template is equipped with the preformed hole of installation madjack pipe, and vault template and side wall template are arranged at a certain distance behind
Attached vibrator is provided with pump line feeding mouth on end head formwork.Vault driving backbreak, end head formwork pump concrete pan feeding
Under the comprehensive functions of factors such as the mouth tenesmus that position is relatively low and concrete is through vibrating, easily there are two lining concrete and come to nothing now with vault
As；By the larger concrete shrinkage of the pump concrete ratio of mud, also large effect, this vault come to nothing phenomenon more very.For this purpose,
Concrete, which reaches to come to nothing to vault using mud-jacking technology after some strength, is filled processing.
The lining of tunnel vault two is designed as domes, and at present since vault comes to nothing seriously, vault highest position forms one
The horizontal plane of elevation is reduced, i.e., domes is evolved into a local plank frame, seriously violates design idea, and dome portions
Bit architecture bearing capacity declines, although having carried out mud jacking filling processing, intensity is well below strong concrete after cement slurry sets
Degree, is still not achieved design strength；And cement mortar drying shrinkage is more obvious, and certain drying shrinkage is there is also after mud jacking and is come to nothing.
Invention content
The purpose of the present invention is to provide a kind of tunnel vault two lining concrete vacuums to assist pouring procedure, existing to solve
The highest position that tunnel vault two present in technology serves as a contrast is come to nothing phenomenon because there are two lining concrete and vaults, leads to arch crown part
The technical issues of structural-load-carrying capacity declines.
To achieve the above object, the technical solution adopted by the present invention is：A kind of lining of tunnel vault two concrete vacuum is provided
Pouring procedure is assisted, is included the following steps：
Lining trolley is in place：Lining trolley is moved to the lower section of concrete strengthening layer, increasing lining trolley support makes lining cutting
Vault template on trolley is adjacent to the bottom of concrete strengthening layer, and one end of vault template is made to be connect with the lining of completed vault two
It touches；
End head formwork is installed：It is set with sealing ring in the exposed junction for the vault main reinforcement for being embedded in concrete strengthening layer, by end
Corresponding preformed hole passes through vault main reinforcement in template, while end head formwork being made to coordinate with waterstop, the lower end of the end head formwork
It is connected with the other end of vault template, is close to be laid with sealing structure progress between the splash guard and end head formwork of vault country rock laying
Sealing, completes the in place of end head formwork；
Exhaust pipe and concrete delivery pipe are installed：Concrete delivery pipe is mounted on to the top of end head formwork, the coagulation
Native delivery pipe is set to the top of concrete strengthening layer；The reserved of installation exhaust pipe is reserved when concrete strengthening layer is constructed in advance
Exhaust pipe for being connected with vacuum pump is installed in preformed hole by hole, and the upper end of exhaust pipe extends to concrete strengthening layer
Top lay falling-off region；
Two lining concrete cast：Exhaust pipe is opened to be vented automatically；By delivery pump by two lining concrete through concrete conveyance
Pipe is delivered to above the concrete strengthening layer of vault region of coming to nothing and is connected on the outside of exhaust pipe until when concrete can not pour into
Vacuum pump starts to extract air, the certain negative pressure of formation in the region that makes to come to nothing above the concrete strengthening layer of vault；Continue to coagulation
Native delivery pipe concrete perfusion, until concrete fills the region of coming to nothing of vault；
Vacuum pump and concrete delivery pipe are removed after concrete final set, and exhaust pipe is reserved for later stage vault mud jacking
Pipe；End head formwork is removed, lining trolley support, mobile lining trolley to next setting are reduced.
Further, when the lining trolley is in place, vault template overlaps 30cm with the lining of vault two is completed.
Further, the exhaust pipe serves as a contrast side close to completed vault two and is arranged.
Further, it is equipped with control between the concrete delivery pipe and delivery pump, between the vacuum pump and exhaust pipe
Valve processed.
Further, the outside of the end head formwork is equipped with the groove coordinated with waterstop.
Further, the sealing structure includes the circumferential compression being embedded between the end head formwork and the splash guard
Caulking gum band, the circumferential direction compression seal rubber strip pass through fluid sealant and the end head formwork and the splash guard stationary phase
Even.
Further, the sealing ring is rubber washer.
Further, the outside of the end head formwork is equipped with the sealing element coordinated with the vault main reinforcement.
Further, the sealing element includes first sleeve and the institute being fixed on the end head formwork outside preformed hole
The second casing that vault main reinforcement protruded length matches is stated, the first sleeve is connect with second casing by connecting pipe
It is fixed；The end of second casing is blind end.
Further, it is coated at the both ends of the connecting pipe and the cooperation of the first sleeve and second casing close
Sealing.
The advantageous effect that tunnel vault two provided by the invention serves as a contrast concrete vacuum auxiliary pouring procedure is：With existing skill
Art is compared, and tunnel vault two of the present invention, which serves as a contrast concrete vacuum auxiliary pouring procedure, can utilize the part two poured to serve as a contrast coagulation
The region of coming to nothing of soil, vault template, end head formwork and splash guard between the top and vault country rock of concrete strengthening layer carries out close
Concrete is carried out concrete cast to region of coming to nothing through concrete delivery pipe using delivery pump, while passing through air extractor by envelope
The top lay falling-off region of concrete strengthening layer is vacuumized, certain negative pressure is formed in the inner cavity in region of coming to nothing.Utilize this hair
It is bright to improve arch crown part concrete thickness and strength of lining, so that the lining of tunnel top two is formed domes, meets design idea,
Arch crown part structural-load-carrying capacity is improved, the present invention is suitable for the tunnels cast-in-place concrete secondary linings such as railway, highway, subway
Construction site.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment for those of ordinary skill in the art without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 be tunnel vault two provided in an embodiment of the present invention serve as a contrast concrete vacuum assist pouring procedure hogging top template and
The scheme of installation of end head formwork；
Fig. 2 is the right view of Fig. 1；
Fig. 3 is the scheme of installation outside end head formwork with the sealing element of vault main reinforcement cooperation in Fig. 1；
Wherein, each reference numeral in figure：
1. vault template, 2. end head formworks, 2-1. grooves, 2-2. first sleeves, 2-3. connecting pipes, second set of 2-4.
Pipe, 2-5. sealing rings, 2-6. circumferential direction compression seal rubber strips, 3. splash guards, 4. waterstops, 5. exhaust pipes, 6. concrete conveyances
Pipe, 7. concrete strengthening layers, 8. vault country rocks, 9. vaults two lining, 9-1. construction joints, 10. vault main reinforcements, 11. fluid sealants, 12.
It comes to nothing region.
Specific implementation mode
In order to make technical problems, technical solutions and advantages to be solved be more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
It should be noted that when element is referred to as " being fixed on " or " being set to " another element, it can be directly another
On one element or it is connected on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on ... shown in the drawings or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, not indicating or implying the indicated device or element must have
Specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Now tunnel vault two provided by the invention lining concrete vacuum auxiliary pouring procedure is illustrated.The tunnel arch
Two lining concrete vacuum of top assists pouring procedure, includes the following steps：
One, lining trolley is in place：Lining trolley is moved to the lower section of concrete strengthening layer, increasing lining trolley support will lining
Vault template on platform building cart is adjacent to the bottom of concrete strengthening layer, and one end of vault template is made to be connect with the lining of completed vault two
It touches.In order to avoid spillage occurs during two liner in pouring for the construction joint that adjacent concrete reinforces interlayer, the lining trolley is just
When position, by vault template and the lining overlap joint of vault two 30cm can be completed.
Two, end head formwork is installed：It is set with sealing ring in the exposed junction for the vault main reinforcement for being embedded in concrete strengthening layer, by end
Corresponding preformed hole passes through vault main reinforcement on head mould plate, while end head formwork being made to coordinate with waterstop, under the end head formwork
End be connected with the other end of vault template, be close to vault country rock be laid with splash guard and end head formwork between laying sealing structure into
Row sealing, completes the in place of end head formwork.
Three, exhaust pipe and concrete delivery pipe are installed：Concrete delivery pipe is mounted on to the top of end head formwork, it is described mixed
Solidifying soil delivery pipe is set to the top of concrete strengthening layer；The pre- of installation exhaust pipe is reserved when concrete strengthening layer is constructed in advance
It boxes out, the exhaust pipe for being connected with vacuum pump is installed in preformed hole, the upper end of exhaust pipe extends to concrete strengthening layer
Top lay falling-off region.
Four, two lining concrete cast：Exhaust pipe is opened to be vented automatically；It is by delivery pump that two lining concrete are defeated through concrete
The concrete strengthening layer upper area for sending pipe to be delivered to vault is connected true until when concrete can not pour on the outside of exhaust pipe
Sky pump starts to extract air, the certain negative pressure of formation in the region that makes to come to nothing above the concrete strengthening layer of vault；Continue to concrete
Delivery pipe concrete perfusion, until concrete fills the region of coming to nothing of vault；Concrete is closed after the completion of concreting in time
Pump line and exhaust pipe control valve.
Five, vacuum pump and concrete delivery pipe are removed after concrete final set, and exhaust pipe is reserved for later stage vault pressure
Slurry pipe；End head formwork is removed, lining trolley support, mobile lining trolley to next setting are reduced.
Tunnel vault two provided by the invention serves as a contrast concrete vacuum and assists pouring procedure, compared with prior art, the present invention
Have the advantages that easy to operate, sealing effect is good, arch crown part structural-load-carrying capacity is strong, by vault template, end head formwork, prevents
Water plate and surrounding sealing structure are sealed the region of coming to nothing at the top of concrete strengthening layer between vault country rock, pass through pumping
Device of air vacuumizes the top face of concrete strengthening layer region of coming to nothing, and the inner cavity in the region that makes to come to nothing forms certain negative pressure, profit
Concrete is subjected to concrete cast through concrete delivery pipe to region of coming to nothing with delivery pump.It is overcome using vacuum aided means
Arch crown part concrete pours into a mould the common quality defects such as thickness deficiency, structure variation (arch becomes plate shape), intensity is low, makes tunnel vault
Portion structure stress more meets design idea, improves the service life in tunnel.The present invention is suitable for railway, highway, subway etc.
Tunnel double-lining concrete cast-in-situ construction site.
Further, referring to Fig. 1, assisting pouring procedure as tunnel vault two provided by the invention lining concrete vacuum
A kind of specific implementation mode, the air extractor includes the exhaust pipe 5 being connected with vacuum pump, and the exhaust pipe 5 is set to institute
It states in concrete strengthening layer 7, one end of the exhaust pipe 5 extends to the top lay falling-off region of concrete strengthening layer 7, the exhaust
The lower section that the other end of pipe extends to the vault template 1 is connected with vacuum pump.Start vacuum pump, using exhaust pipe by concrete
Negative pressure state is pumped into the top lay falling-off region of reinforcing layer, is facilitated concrete delivery pipe to carry out concrete cast to region of coming to nothing, is kept away
Exempt from concrete in casting process and included air, ensure concrete casting quality, so that the lining of tunnel top two is formed domes, improve
Arch crown part structural-load-carrying capacity.
Further, referring to Fig. 1, assisting pouring procedure as tunnel vault two provided by the invention lining concrete vacuum
A kind of specific implementation mode, the exhaust pipe 5 close to completed vault two serve as a contrast 9 sides be arranged.It is convenient to de- to be arranged so
Empty region is evacuated, and will not be poured into a mould concrete and be interfered.
Further, referring to Fig. 1, assisting pouring procedure as tunnel vault two provided by the invention lining concrete vacuum
A kind of specific implementation mode, be all provided between the concrete delivery pipe 6 and delivery pump, between the vacuum pump and exhaust pipe 5
There is control valve.Using the installation and keying of control valve easy to exhaust pipe and concrete delivery pipe, it is being mounted on lining trolley in advance
Exhaust pipe exposed junction installation control valve in the vault template of tail portion and plug, it is vault part to remove after plug installs vacuum pump
Come to nothing region provide vacuum degree (negative pressure), for concrete pumping cast create conditions；Utilize the control valve on concrete delivery pipe
Prevent the loss that leaks of concrete after concreting.
Further, please refer to Fig.1,2, as tunnel vault two provided by the invention lining concrete vacuum assist cast side
A kind of specific implementation mode of method, the outside of the end head formwork 2 is equipped with the groove 2-1 coordinated with waterstop 4, by groove side
Just waterstop is installed between adjacent vault two serves as a contrast, while also avoids that gas leakage at waterstop is installed on end head formwork.
Further, please refer to Fig.1,2, as tunnel vault two provided by the invention lining concrete vacuum assist cast side
A kind of specific implementation mode of method, the sealing structure include the ring being embedded between the end head formwork 2 and the splash guard 3
To compression seal rubber strip 2-6, the circumferential direction compression seal rubber strip 2-6 passes through fluid sealant and the end head formwork 2 and described
Splash guard 3 is fixedly linked.It is close to being carried out between splash guard at the top of end head formwork by circumferential compression seal rubber strip and fluid sealant
Envelope ensures the sealing effect in region of coming to nothing.
Further, assist one kind of pouring procedure specific as tunnel vault two provided by the invention lining concrete vacuum
Embodiment, the sealing ring 2-5 are rubber washer.Using rubber washer to the preformed hole of installation vault main reinforcement on end head formwork
Place is sealed, and prevents that spillage occurs in casting process.
Further, please refer to Fig.1,3, as tunnel vault two provided by the invention lining concrete vacuum assist cast side
A kind of specific implementation mode of method, the outside of the end head formwork 2 are equipped with the sealing element coordinated with the vault main reinforcement 10.Its
In, sealing element can be mounted on outside the vault main reinforcement of top, since top vault main reinforcement is close to the top surface of concrete strengthening layer, two
Serve as a contrast in concrete placement can the air inlet due to poorly sealed, cause top region vacuum degree effect of coming to nothing poor；And lower part
The cooperation of vault main reinforcement and end head formwork is in casting process, can concrete slurry all its gap can be blocked, will not
The phenomenon that there are gas leakage.
The sealing element includes first sleeve 2-2 and the vault being fixed on the end head formwork 2 outside preformed hole
The second casing 2-4, the first sleeve 2-2 that 10 protruded length of main reinforcement matches and the second casing 2-4 passes through connecting tube
Part 2-3 is connected and fixed.Wherein, the both ends of connecting pipe are machined with internal thread, first sleeve and the second casing and connecting pipe
One end of cooperation is machined with external screw thread, first sleeve and the second casing and connecting pipe screw-thread fit, facilitates installing and dismounting
It is sealed at the preformed hole to installing vault main reinforcement on end head formwork simultaneously；Wherein one end of the second casing 2-4 is blind end.
Further, please refer to Fig.1,3, as tunnel vault two provided by the invention lining concrete vacuum assist cast side
A kind of specific implementation mode of method, the both ends of the connecting pipe 2-3 and the first sleeve 2-2 and the second casing 2-4
Cooperation at be coated with fluid sealant.Bobbin seal glue is further close to being carried out at the preformed hole of installation vault main reinforcement on end head formwork
Envelope, is further ensured that sealing effect.
The scheme of installation of vault template, end head formwork in the specific embodiment of the present invention please refers to Fig.1 and schemes
2, steps are as follows for Specific construction：
One, lining trolley is in place, vault template overlaps 30cm with the lining of vault two is completed when in place；
Two, end head formwork is installed, stretched out outside end head formwork after overlap joint main reinforcement is penetrated rubber washer, outside the vault main reinforcement of top
End first sleeve, the second casing and connecting pipe are tightly connected；Waterstop is placed in end head formwork waterstop groove；It is holding
It is pressed into circumferential compression seal rubber strip between head die head and splash guard, is used in combination fluid sealant tight-closed；
Three, PVC exhaust pipes and control valve are installed in the arch crown part preformed hole of lining trolley rear end；
Four, two lining concrete vacuum auxiliary cast：Exhaust pipe and control valve are opened, in favor of being vented automatically；According to previous
When pumping, two lining concrete to arch crown part of Vibration Technology cast, when concrete can not pour into, in the control valve of exhaust pipe
Outside connection vacuum pump, which starts extraction air, to be made to form certain negative pressure in vault cavity；In the concrete of end head formwork arch crown part
Concrete pumping pipe is connected on the outside of delivery pipe and control valve, opens control valve to vault concrete perfusion；When concrete is filled
Vault come to nothing region cavity after close both sides control valve in time, prevent the concrete poured into flow out.
Five, exhaust pipe control valve is removed after concrete final set, and exhaust pipe is reserved for later stage vault madjack pipe；It removes
End head formwork reduces lining trolley support, mobile lining trolley to next setting.Before tunnel vault two serves as a contrast concrete cast
It need to carry out following seal operation：
1. forming the sealing between vault and country rock using the water-proof function of splash guard；
2. waterstop and cast-in-place vault two lining between the lining of concrete vault two construction joint twice is utilized to form lining cutting platform
The sealing at vehicle rear；
3. serving as a contrast cast-in-place concrete using both sides side wall vault two forms both sides sealing；
4. forming the sealing between end head formwork bottom and vault template using cast-in-place concrete；
5. using elasticity circumferential compression seal rubber strip and fluid sealant formed end head formwork at the top of with vault splash guard it
Between sealing；
6. overlapping vault main reinforcement using the sealing element on the outside of preformed hole on end head formwork, while rubber is set on the inside of end head formwork
Rubber gasket mortar leakage prevention；
7. using first sleeve, the second casing and the connecting pipe of the setting overlap joint vault main reinforcement on the outside of end head formwork, and
Carrying out closure mating surface by fluid sealant prevents gas leakage；
8. using the exhaust pipe, control valve and the plug that are mounted in advance in the vault template of lining trolley tail portion, vacuum is installed
Certain vacuum degree (negative pressure) is locally provided for vault after pump, is created conditions for concrete pumping cast；
9. coagulation after preventing concrete from pouring into a mould using the concrete delivery pipe and control valve being fixed on end head formwork
Soil is lost in.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. tunnel vault two serves as a contrast concrete vacuum and assists pouring procedure, which is characterized in that include the following steps：
Lining trolley is in place：Lining trolley is moved to the lower section of concrete strengthening layer, increasing lining trolley support makes lining trolley
On vault template be adjacent to the bottom of concrete strengthening layer, so that one end of vault template is contacted with the lining of completed vault two；
End head formwork is installed：It is set with sealing ring in the exposed junction for the vault main reinforcement for being embedded in concrete strengthening layer, by end head formwork
Upper corresponding preformed hole passes through vault main reinforcement, while end head formwork being made to coordinate with waterstop, the lower end of the end head formwork and arch
The other end of top template is connected, and laying sealing structure progress is close between being close to the splash guard and end head formwork of vault country rock laying
Envelope, completes the in place of end head formwork；
Exhaust pipe and concrete delivery pipe are installed：Concrete delivery pipe is mounted on to the top of end head formwork, the concrete is defeated
The top for sending pipe to be set to concrete strengthening layer；The preformed hole of installation exhaust pipe is reserved when concrete strengthening layer is constructed in advance,
Exhaust pipe for being connected with vacuum pump is installed in preformed hole, the upper end of exhaust pipe extends to the top of concrete strengthening layer
It comes to nothing region；
Two lining concrete cast：Exhaust pipe is opened to be vented automatically；It is by delivery pump that two lining concrete are defeated through concrete delivery pipe
It send to region of coming to nothing above the concrete strengthening layer of vault and connects vacuum on the outside of exhaust pipe until when concrete can not pour into
Pump starts to extract air, the certain negative pressure of formation in the region that makes to come to nothing above the concrete strengthening layer of vault；Continue defeated to concrete
Pipe concrete perfusion is sent, until concrete fills the region of coming to nothing of vault；
Vacuum pump and concrete delivery pipe are removed after concrete final set, and exhaust pipe is reserved for later stage vault madjack pipe；It tears open
Except end head formwork, lining trolley support, mobile lining trolley to next setting are reduced.
2. tunnel vault two as described in claim 1 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The lining cutting
When trolley is in place, the vault template overlaps 30cm with the lining of vault two is completed.
3. tunnel vault two as claimed in claim 2 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The exhaust
Pipe serves as a contrast side setting close to completed vault two.
4. tunnel vault two as claimed in claim 2 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The coagulation
It is equipped with control valve between native delivery pipe and delivery pump, between the vacuum pump and exhaust pipe.
5. tunnel vault two as described in claim 1 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The end
The outside of template is equipped with the groove coordinated with waterstop.
6. tunnel vault two as described in claim 1 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The sealing
Structure includes the circumferential compression seal rubber strip being embedded between the end head formwork and the splash guard, and the circumferential compression is close
Envelope rubber strip is fixedly linked by fluid sealant and the end head formwork and the splash guard.
7. tunnel vault two as claimed in claim 6 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The sealing
Circle is rubber washer.
8. assisting pouring procedure as claim 1-7 any one of them tunnel vault two serves as a contrast concrete vacuum, it is characterised in that：
The outside of the end head formwork is equipped with the sealing element coordinated with the vault main reinforcement.
9. tunnel vault two as claimed in claim 8 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The sealing
Part includes being fixed on first sleeve on the end head formwork outside preformed hole, matching with the vault main reinforcement protruded length
Second casing, the first sleeve are connected and fixed with second casing by connecting pipe；The end of second casing is
Blind end.
10. tunnel vault two as claimed in claim 9 serves as a contrast concrete vacuum and assists pouring procedure, it is characterised in that：The company
It is coated with fluid sealant at the both ends of jointed tubular workpieces and the cooperation of the first sleeve and second casing.
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| CN201810469571.8A CN108661671B (en) | 2018-05-16 | 2018-05-16 | Vacuum auxiliary pouring method for tunnel vault secondary lining concrete |
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| CN109184751A (en) * | 2018-11-16 | 2019-01-11 | 中铁隧道集团处有限公司 | Endoscopic bomb shelter monitoring device and monitoring method for tunnel-liner vault |
| CN110486037A (en) * | 2019-08-26 | 2019-11-22 | 中铁二局第一工程有限公司 | A kind of constructing structure that railway tunnel vault prevents two lining vaults from coming to nothing and method |
| CN110847933A (en) * | 2019-10-08 | 2020-02-28 | 中铁隧道局集团建设有限公司 | Method for preventing and controlling tunnel vault from being hollow |
| CN111894630A (en) * | 2020-06-16 | 2020-11-06 | 神华包神铁路集团有限责任公司 | Clearing structure and treatment method for tunnel brake tip defect |
| CN112538911A (en) * | 2019-09-23 | 2021-03-23 | 董建军 | Organic cementing material concrete |
| CN113217024A (en) * | 2021-05-19 | 2021-08-06 | 中铁二十局集团第四工程有限公司 | Crotch type pumping construction method for preventing concrete at vault of secondary lining of underground excavated tunnel from being emptied |
| CN113323694A (en) * | 2021-06-29 | 2021-08-31 | 重庆科技学院 | Tunnel lining cavity negative pressure grouting process |
| CN114161580A (en) * | 2021-09-28 | 2022-03-11 | 湖南工业大学 | Concrete on-site pumping vacuum stirring conveying pipe and construction process |
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| CN109184751A (en) * | 2018-11-16 | 2019-01-11 | 中铁隧道集团处有限公司 | Endoscopic bomb shelter monitoring device and monitoring method for tunnel-liner vault |
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| CN113217024A (en) * | 2021-05-19 | 2021-08-06 | 中铁二十局集团第四工程有限公司 | Crotch type pumping construction method for preventing concrete at vault of secondary lining of underground excavated tunnel from being emptied |
| CN113217024B (en) * | 2021-05-19 | 2022-08-12 | 中铁二十局集团第四工程有限公司 | Crotch type pumping construction method for preventing concrete at vault of secondary lining of underground excavated tunnel from being emptied |
| CN113323694A (en) * | 2021-06-29 | 2021-08-31 | 重庆科技学院 | Tunnel lining cavity negative pressure grouting process |
| CN113323694B (en) * | 2021-06-29 | 2024-02-20 | 重庆科技学院 | Negative pressure grouting process for tunnel lining cavity |
| CN114161580A (en) * | 2021-09-28 | 2022-03-11 | 湖南工业大学 | Concrete on-site pumping vacuum stirring conveying pipe and construction process |
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