CN110374630B - Construction method for concrete vibration of tunnel vault - Google Patents
Construction method for concrete vibration of tunnel vault Download PDFInfo
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- CN110374630B CN110374630B CN201910506930.7A CN201910506930A CN110374630B CN 110374630 B CN110374630 B CN 110374630B CN 201910506930 A CN201910506930 A CN 201910506930A CN 110374630 B CN110374630 B CN 110374630B
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 claims description 22
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 239000011435 rock Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000009415 formwork Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 239000011440 grout Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- 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
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- 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
-
- 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
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- 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)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to the technical field of tunnel lining construction, and particularly relates to a construction method for concrete vibration of a tunnel vault, which comprises the following specific steps: 1. measuring and scribing; 2. presetting a corrugated pipe; 3. installing a lining template; 4. pouring concrete; 5. performing attached vibration; 6. inserting vibration; 7. the bellows is filled. The construction method for vibrating the concrete at the arch crown of the tunnel improves the vibrating quality by adopting a mode of matching the attached vibrating and the inserted vibrating.
Description
Technical Field
The invention belongs to the technical field of tunnel lining construction, and particularly relates to a construction method for concrete vibration of a tunnel vault.
Background
The hydraulic tunnel mostly uses the steel mould trolley to carry out concrete lining, and the attached vibrator of the steel mould trolley is used to vibrate outside the template when concrete is poured. However, with the development of the hydropower industry, the thickness of the concrete lining of the tunnel is larger and larger, and the attached vibrator can only vibrate the concrete close to the template tightly, so that the peripheral concrete cannot be vibrated tightly.
Along with the rapid development of the hydropower industry, the scale of a hydropower station is larger and larger, the diameter of a diversion tunnel is larger and larger, the thickness of tunnel lining concrete is also increased gradually, and tunnels with the lining thickness exceeding 60cm are frequently used, and some tunnels even exceed 80 cm. For the tunnel with larger lining thickness, the part below the arch shoulder can be vibrated at the feed inlet by using an inserted vibrator and an attached vibrator in a combined manner, so that the concrete can be vibrated and compacted; however, the top arch concrete can only be vibrated outside the formwork by using the attached vibrator due to the fact that the plug-in vibrator can not be used at the feeding hole, and the vibrating effect cannot be guaranteed. If the high-power attached vibrator is adopted, although the vibrating effect of the top arch concrete can be improved, the lining trolley is easy to deform or even collapse, and the engineering quality risk and the safety risk are greatly increased.
For example, the patent with the Chinese patent application number of CN201611078266.3 discloses a slip form for the lining of inverted arch concrete of a tunnel and a construction method, wherein a protective plate perpendicular to the slip form is arranged on the periphery of the slip form, the slip form and the protective plate are connected into a whole, reinforcing ribs are arranged on the slip form, the geometric shape of the slip form is the same as that of the inverted arch of the tunnel, a left feeding hopper is arranged on the left side of the slip form in a penetrating manner, a right feeding hopper is arranged on the right side of the slip form in a penetrating manner, and a winch and a flat plate vibrator are arranged on the slip form. The construction method of the tunnel inverted arch concrete lining slip form comprises the steps of leveling the slip form sliding track, positioning the slip form, connecting a slip form sliding power device, pouring concrete and manually leveling the concrete surface. However, the method is not suitable for the vibration construction of the vault concrete, and the construction effect cannot be guaranteed.
Disclosure of Invention
The invention aims to provide a construction method for vibrating concrete at the arch crown of a tunnel aiming at the defects of the prior art, and the vibrating quality is improved by adopting a mode of matching attached vibrating and inserted vibrating.
The technical scheme for solving the problems is to provide a construction method for vibrating the concrete at the arch top of the tunnel, which comprises the following steps:
step 1, measuring and scribing:
marking a line at the center of the vault along the axial direction of the tunnel, marking two side lines at 45-75 degrees on two sides of the line, and taking the position between the two side lines as the vault construction range;
in the construction range of the vault, 1 corrugated pipe with the diameter of 80mm is arranged along the circumferential direction of the tunnel at intervals of 60cm, the center of each corrugated pipe is 50cm away from the lining template, and each corrugated pipe penetrates through the whole 12m long bin number along the axis direction of the tunnel;
installing a phi 20 dowel bar at each 1.0m of the tunnel top arch position corresponding to the corrugated pipe along the longitudinal direction of the corrugated pipe, wherein the dowel bar is inserted into the rock by 20cm, and the length of the exposed rock surface of the dowel bar is 10cm longer than the distance between the corrugated pipe and the rock surface; binding and fixing the corrugated pipe and the dowel bars by using iron wires with the diameter of 3.5 mm;
moving the lining trolley to a tunnel section to be lined, and adjusting the axis of the lining trolley to enable the axis of the lining trolley to be overlapped with the axis direction of the tunnel; opening hydraulic jacking equipment of the lining trolley, and jacking the lining template to the position of the lining contour line; installing a lining template at the end of the silo, opening a hole in the lining template at the end, and penetrating out the pipe orifice of the pre-buried corrugated pipe;
transporting concrete materials to a working surface from a mixing station by using a concrete tank truck, transporting the concrete materials into a bin number through a feeding hole of a lining trolley by using a concrete transporting pump, pouring concrete, and uniformly lifting the concrete materials on two sides of the lining trolley, wherein the height difference is less than 0.5 m;
arranging attached vibrators on the lining trolley, arranging 8 rings in each 2.0m, arranging 6 rings in each ring, and welding and fixing the 48 rings with the lining trolley; vibrating the poured concrete material once by using an attached vibrator every 30cm, starting the vibrator one time, and vibrating for 20 s;
step 6, inserting vibration:
aiming at concrete materials in a top arch range, after the concrete materials are vibrated by using an attached vibrator, an inserted vibrator with the diameter of 30mm is used for extending into a corrugated pipe channel to vibrate peripheral concrete materials, and the effective insertion length is greater than the length of a bin;
step 7, filling the corrugated pipe:
one end of the grouting pipe is connected with a grouting pump, the other end of the grouting pipe is inserted into the bottom of the corrugated pipe, grout is delivered into the corrugated pipe, the grouting pipe is slowly pulled out along with the traveling speed of the grouting mortar, and the corrugated pipe is tightly filled; after one corrugated pipe is filled, filling the next corrugated pipe; repeating the steps and filling all the corrugated pipes in sequence;
step 8, demolding and post-processing:
and (3) removing the formwork after the strength of the lined concrete and the poured mortar reaches 70%, and cutting off the end of the corrugated pipe exposed on the surface of the concrete by using a polishing machine after the end formwork is removed, and entering the next cycle.
Further, in the step 2, when the vault concrete is larger than 80cm, 2-3 layers of corrugated pipes are buried.
Further, in the step 2, the steel bars are formed by electric hammer holes, and the steel bar planting glue is used for anchoring.
Further, in the step 3, before the lining trolley travels to the tunnel section needing lining, embedded parts such as the tunnel section steel bar and the water stop belt are installed.
Further, in step 6, the inserting type vibrating specifically comprises the following steps: directly inserting an insertion vibrator into the bottom of a corrugated pipe from a corrugated pipe orifice penetrating out of an end template, starting the insertion vibrator, vibrating for 20s at the bottom of the pipe, and stopping when floating slurry appears on the surface of the concrete material at the vibrated position and no bubbles emerge; then pulling the corrugated pipe outwards for 50cm, vibrating the corrugated pipe for 20s again, and repeating the operation until the inserted vibrator is pulled out completely and the vibration of the corrugated pipe is finished; and vibrating the next corrugated pipe after the vibration of one corrugated pipe is finished, and repeating the operations until all the corrugated pipes are completely vibrated.
Further, in step 7, the pipe orifice should be tightly sealed after the corrugated pipe is filled with mortar.
Further, the step 1 further comprises the step of acquiring data of the inner contour of the tunnel by using a tunnel profiler; the protruding parts which can affect the lining templates in the tunnel are ground to be flat so as to be beneficial to the installation of the lining templates; the recess in the tunnel is filled with concrete to prevent voids from forming after the lining form is installed.
Further, the step 4 further includes a step of monitoring the pressure of the poured concrete.
Further, in step 4, the pouring concrete includes: 380 parts of Portland cement, 1000 parts of aggregate 850, 550 parts of sand 450, 220 parts of water glass, 8-12 parts of vitrified micro bubbles, 50-150 parts of fly ash, 40-80 parts of steel fiber, 3-5 parts of propyl coagulation and 2-3 parts of polycarboxylic acid high-performance water reducing agent, wherein the components are calculated by mass.
The invention has the beneficial effects that:
1. the construction method for concrete vibration of the tunnel vault mainly uses conventional materials such as corrugated pipes, reinforcing steel bars, iron wires, cement, sand and the like; convenient operation, consuming less time, and can not influence the construction progress.
2. The construction method for vibrating the concrete at the arch crown of the tunnel is not limited by the thickness of lining concrete, and for the concrete at the arch crown with larger lining thickness, a plurality of layers of corrugated pipes are buried in the range of the arch crown to realize vibration compaction; and the operation is realized by increasing the length of the embedded corrugated pipe and the length of the flexible shaft of the plug-in vibrator for the bin number which is longer in lining.
3. According to the construction method for vibrating the concrete at the arch crown of the tunnel, after the concrete at the arch crown is vibrated, mortar with the grade not lower than that of the designed concrete is used for filling and compacting the pre-buried corrugated pipe channel, so that the condition that the quality of the concrete is not influenced by a cavity left in the corrugated pipe is ensured.
4. According to the construction method for vibrating the concrete at the arch crown of the tunnel, disclosed by the invention, the concrete at the arch crown of the tunnel is vibrated by adopting a mode of matching the attached vibration and the inserted vibration, so that the vibrating quality is improved.
Drawings
FIG. 1 is a schematic view of a corrugated pipe arrangement structure in the construction method for concrete vibration of a tunnel vault of the invention;
FIG. 2 is a schematic construction diagram of filling corrugated pipes in the construction method for vibrating concrete at the arch crown of the tunnel according to the present invention;
in the figure, 1-corrugated pipe, 2-lining template, 3-lining trolley, 4-dowel, 5-attached vibrator, 6-grouting pipe and 7-grouting pump.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, it being understood that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
Examples
The construction method for vibrating the concrete at the arch crown of the tunnel specifically comprises the following steps:
step 1, measuring and scribing:
and marking a line at the center of the vault along the axis direction of the tunnel through a leveling instrument and a line-laying instrument, marking two side lines at 60-degree positions on two sides of the line, and taking the position between the two side lines as the vault construction range.
In this embodiment, the scribe line uses a spray gun to spray red paint.
in the construction range of the vault, 1 phi 80mm corrugated pipe 1 is arranged at intervals of 60cm along the circumferential direction of the tunnel, the distance between the center of the corrugated pipe 1 and a lining template 2 is 50cm, each corrugated pipe 1 penetrates through the whole cabin number with the length of 12m along the axial direction of the tunnel, and the strip gauge data approaching the tunnel house profile measurement data is obtained at intervals of 60cm along the circumferential direction of the tunnel.
Installing a phi 20 dowel bar 4 at the top arch position of the tunnel corresponding to the corrugated pipe 1 along the longitudinal length of the corrugated pipe 1 per 1.0m, enabling the dowel bar 4 to enter the rock by 20cm, and enabling the length of the exposed rock surface of the dowel bar 4 to be 10cm longer than the distance between the corrugated pipe 1 and the rock surface, if: tunnel crown lining thickness is 80cm, need fix bellows 1 in the position apart from 50cm with lining cutting template 2, and the distance of bellows 1 and rock face is 30cm, and then the distance that dowel 4 exposes the rock face should be 30cm +10cm ═ 40cm, and dowel 4 adopts the electric hammer pore-forming, and the bar planting is glued and is anchored. Use phi 3.5mm iron wire with bellows 1 and dowel 4 ligature firm, prevent that bellows 1 from taking place the displacement when the arch crown concrete vibrates. When binding, the corrugated pipe 1 is ensured to be transparent, straight and undamaged.
When the vault concrete is larger than 80cm, 2-3 layers of corrugated pipes 1 are buried.
installing embedded parts such as the hole section steel bar and the water stop belt, walking the lining trolley 3 to the hole section needing lining, and adjusting the axis of the lining trolley 3 to be coincident with the axis direction of the hole; and (4) opening a hydraulic jacking system of the lining trolley 3, and jacking the lining template 2 to the position of the lining contour line. And installing the lining template 2 at the end of the cabin, wherein the lining template 2 at the end is in a circular ring shape, and firmly and tightly plugging the two ends of the lining trolley 3. And (3) opening a hole on the lining template 2 at the end head, and enabling the pipe orifice of the pre-buried corrugated pipe 1 to penetrate out of the lining template 2 at the end head.
concrete is transported to a working surface from a mixing station by using a concrete tank truck, and the concrete is transported into a bin number through a feeding hole of the lining trolley 3 by using a concrete delivery pump. And in the pouring process, concrete materials on two sides of the lining trolley 3 are uniformly lifted, and the height difference is not more than 0.5 m.
the lining trolley 3 is provided with an attached vibrator 5, 8 rings are arranged every 2.0m, the total number of the rings is 48, and the rings are firmly welded with the lining trolley 3. The attached vibrator 5 is used for vibrating the concrete once every 30cm of the concrete rises, and the attached vibrator 5 can only open the attached vibrator 5 at an adjacent position every time to prevent the lining trolley 3 from deforming. The vibration time is controlled to be 20s, and the vibration is stopped when the floating slurry appears on the surface of the concrete material at the vibrated position and no air bubbles emerge.
Step 6, inserting vibration:
for concrete materials with the top arch within 120 degrees, after the concrete materials are vibrated by an attached vibrator 5, an inserted vibrator (not shown in the figure) is used for extending into a channel of the corrugated pipe 1 to vibrate peripheral concrete materials with the thickness of more than 50cm, the diameter of the inserted vibrator is 30mm, the effective insertion length is greater than the length of a bin number, and the effective insertion length is at least 12 m.
Directly inserting an insertion vibrator into the bottom of a corrugated pipe 1 from a pipe orifice of the corrugated pipe 1 penetrating out of an end template, starting the insertion vibrator, vibrating for 20s at the bottom of the pipe, and stopping when floating slurry appears on the surface of the concrete material at the vibrated position and no bubbles emerge; then, the corrugated pipe 1 is pulled outwards for 50cm, and is vibrated for 20s again, and the corrugated pipe 1 is pulled outwards for 50cm each time until the plug-in vibrator is completely pulled out, and the vibration is finished; and vibrating the next corrugated pipe 1 after the vibration of one corrugated pipe 1 is finished, and repeating the operations until all the corrugated pipes 1 are completely vibrated.
Step 7, filling the corrugated pipe 1:
one end of the grouting pipe 6 is connected with a grouting pump 7, the other end of the grouting pipe is inserted into the bottom of the corrugated pipe 1, slurry is fed into the corrugated pipe 1, the grouting pipe 6 is slowly pulled out along with the traveling speed of the grouting mortar, and the corrugated pipe 1 is tightly poured; after the filling of one corrugated pipe 1 is finished, filling the next corrugated pipe 1; the steps are repeated to fill all the corrugated pipes 1 in sequence. The corrugated pipe 1 is tightly plugged after mortar is poured.
Step 8, demolding and post-processing:
the formwork can be removed after the strength of the lined concrete and the poured mortar reaches 70 percent, after the end formwork is removed, the end of the corrugated pipe 1 exposed on the surface of the concrete is cut off by using a polishing machine, and then the next cycle is started.
In this embodiment, the step 1 further includes a step of acquiring data of an inner contour of the tunnel by using a tunnel profiler, particularly acquiring a vault construction range to know the flatness of the vault construction range; the protruding parts which can affect the lining templates in the tunnel are ground to be flat so as to be beneficial to the installation of the lining templates; the recess in the tunnel is filled with concrete to prevent voids from forming after the lining form is installed.
And marking the protruding part and the recessed part by different marking signals respectively so as to facilitate different processing modes in the later period.
In this embodiment, the step 4 further includes a step of monitoring the pressure of the poured concrete. The pressure of the concrete is acquired through the pressure sensor so as to know the pouring condition of the concrete.
In this embodiment, in step 4, the pouring concrete includes: 380 parts of Portland cement, 1000 parts of aggregate 850, 550 parts of sand 450, 220 parts of water glass, 8-12 parts of vitrified micro bubbles, 50-150 parts of fly ash, 40-80 parts of steel fiber, 3-5 parts of propyl coagulation, 2-3 parts of polycarboxylic acid high-performance water reducing agent, 30-40 parts of shale ceramic sand and 180 parts of water by mass.
As a modification of this embodiment, at least 1 corrugated tube 1 with a diameter of 80mm is provided at the bottom of the tunnel, and before the step of performing the insertion vibration, the corrugated tube 1 provided at the bottom of the tunnel is vibrated. Wherein, bellows 1 that the bottom in tunnel was equipped with still can adopt the dowel ligature.
As an improvement of this embodiment, a plurality of plug-in vibrators can be used to simultaneously perform the vibrating operation.
The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (9)
1. A construction method for vibrating concrete at a tunnel vault is characterized by comprising the following steps:
step 1, measuring and scribing:
marking a line at the center of the vault along the axial direction of the tunnel, marking two side lines at 45-75 degrees on two sides of the line, and taking the position between the two side lines as the vault construction range;
step 2, presetting a corrugated pipe:
in the construction range of the vault, 1 corrugated pipe with the diameter of 80mm is arranged along the circumferential direction of the tunnel at intervals of 60cm, the center of each corrugated pipe is 50cm away from the lining template, and each corrugated pipe penetrates through the whole 12m long bin number along the axis direction of the tunnel;
installing a phi 20 dowel bar at the arch top position of the tunnel corresponding to the corrugated pipe along the longitudinal direction of the corrugated pipe every 1.0m, wherein the dowel bar is inserted into the rock by 20cm, and the length of the exposed rock surface of the dowel bar is 10cm longer than the distance between the corrugated pipe and the rock surface; binding and fixing the corrugated pipe and the dowel bars by using iron wires with the diameter of 3.5 mm;
step 3, installing a lining template:
moving the lining trolley to a tunnel section to be lined, and adjusting the axis of the lining trolley to enable the axis of the lining trolley to be overlapped with the axis direction of the tunnel; opening hydraulic jacking equipment of the lining trolley, and jacking the lining template to the position of the lining contour line; installing a lining template at the end of the silo, opening a hole in the lining template at the end, and penetrating out the pipe orifice of the pre-buried corrugated pipe;
step 4, pouring concrete:
transporting concrete materials to a working surface from a mixing station by using a concrete tank truck, transporting the concrete materials into a bin number through a feeding hole of a lining trolley by using a concrete transporting pump, pouring concrete, and uniformly lifting the concrete materials on two sides of the lining trolley, wherein the height difference is less than 0.5 m;
step 5, attached vibration:
arranging attached vibrators on the lining trolley, arranging 8 rings in each 2.0m, arranging 6 rings in each ring, and welding and fixing the 48 rings with the lining trolley; vibrating the poured concrete material once by using an attached vibrator every 30cm, starting the vibrator one time, and vibrating for 20 s;
step 6, inserting vibration:
aiming at concrete materials in the vault range, after vibrating by using an attached vibrator, extending an inserted vibrator with the diameter of 30mm into a corrugated pipe channel to vibrate peripheral concrete materials, wherein the effective insertion length is greater than the length of a bin;
step 7, filling the corrugated pipe:
one end of the grouting pipe is connected with a grouting pump, the other end of the grouting pipe is inserted into the bottom of the corrugated pipe, grout is delivered into the corrugated pipe, the grouting pipe is slowly pulled out along with the traveling speed of the grouting mortar, and the corrugated pipe is tightly filled; after one corrugated pipe is filled, filling the next corrugated pipe; repeating the steps and filling all the corrugated pipes in sequence;
step 8, demolding and post-processing:
and removing the formwork after the strength of the lined concrete and the poured mortar reaches 70%, and cutting off the end of the corrugated pipe exposed on the surface of the concrete by using a polishing machine after the end formwork is removed.
2. The construction method for vibrating the concrete at the arch crown of the tunnel according to claim 1, wherein in the step 2, 2-3 layers of corrugated pipes are buried when the concrete at the arch crown is larger than 80 cm.
3. The method for vibrating and constructing the concrete at the arch crown of the tunnel according to claim 1, wherein in the step 2, the inserted bars are formed by adopting an electric hammer, and are anchored by using bar-planting glue.
4. The construction method for vibrating the concrete at the arch crown of the tunnel according to claim 1, wherein in the step 3, before the lining trolley travels to the tunnel section needing lining, the tunnel section steel bars and the water stop embedded parts are installed.
5. The construction method for vibrating the concrete at the arch top of the tunnel according to claim 1, wherein in the step 6, the concrete steps of inserting vibration are as follows: directly inserting an insertion vibrator into the bottom of a corrugated pipe from a corrugated pipe orifice penetrating out of an end template, starting the insertion vibrator, vibrating for 20s at the bottom of the pipe, and stopping when floating slurry appears on the surface of the concrete material at the vibrated position and no bubbles emerge; then pulling the corrugated pipe outwards for 50cm, vibrating the corrugated pipe for 20s again, and repeating the operation until the inserted vibrator is pulled out completely and the vibration of the corrugated pipe is finished; and vibrating the next corrugated pipe after the vibration of one corrugated pipe is finished, and repeating the operations until all the corrugated pipes are completely vibrated.
6. The method for vibrating and constructing the concrete of the arch crown of the tunnel according to the claim 1, wherein in the step 7, the pipe orifice is tightly sealed after the corrugated pipe is filled with the mortar.
7. The construction method for vibrating concrete at the arch top of the tunnel according to claim 1, wherein the step 1 further comprises the step of acquiring data of the inner contour of the tunnel by using a tunnel profiler; the protruding parts which can affect the lining templates in the tunnel are ground to be flat so as to be beneficial to the installation of the lining templates; the recess in the tunnel is filled with concrete to prevent voids from forming after the lining form is installed.
8. The method for vibrating and constructing concrete of a tunnel vault according to claim 1, wherein the step 4 further comprises the step of monitoring the pressure of the poured concrete.
9. The method for vibrating and constructing the concrete of the tunnel vault according to the claim 1, wherein in the step 4, the concrete pouring includes: 380 parts of Portland cement, 1000 parts of aggregate 850, 550 parts of sand 450, 220 parts of water glass, 8-12 parts of vitrified micro bubbles, 50-150 parts of class II fly ash, 40-80 parts of steel fiber, 3-5 parts of propyl coagulation and 2-3 parts of polycarboxylic acid high-performance water reducing agent, wherein the components are calculated by mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910506930.7A CN110374630B (en) | 2019-06-12 | 2019-06-12 | Construction method for concrete vibration of tunnel vault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910506930.7A CN110374630B (en) | 2019-06-12 | 2019-06-12 | Construction method for concrete vibration of tunnel vault |
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| Publication Number | Publication Date |
|---|---|
| CN110374630A CN110374630A (en) | 2019-10-25 |
| CN110374630B true CN110374630B (en) | 2021-02-26 |
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| CN111274708B (en) * | 2020-02-14 | 2022-04-29 | 哈尔滨工程大学 | Method for predicting penetration distance of multiple-injection spraying of marine diesel engine |
| CN113738402B (en) * | 2021-09-18 | 2024-04-09 | 湖北祖德水利水电工程有限公司 | Supporting system and method for hydraulic tunnel construction |
| CN114633341B (en) * | 2022-03-30 | 2024-04-26 | 江西工业贸易职业技术学院 | Be used for precast concrete vibrator for building assembly |
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| JP4459637B2 (en) * | 2004-01-29 | 2010-04-28 | 前田建設工業株式会社 | Vibrator system for concrete compaction |
| JP6190744B2 (en) * | 2014-03-25 | 2017-08-30 | 鹿島建設株式会社 | Concrete compaction device and concrete compaction method |
| CN106640135B (en) * | 2016-12-08 | 2018-11-09 | 中铁十四局集团第二工程有限公司 | A kind of automatic vibrating system and vibrating method performing concrete for tunnel double-lining |
| CN107448217A (en) * | 2017-09-25 | 2017-12-08 | 中铁十七局集团第工程有限公司 | A kind of practical tunnel lining trolley vibrating system |
| CN108194136B (en) * | 2017-12-31 | 2019-09-20 | 中铁十九局集团第二工程有限公司 | Lining construction method |
| CN109026065B (en) * | 2018-07-25 | 2020-01-17 | 中铁十六局集团有限公司 | Tunnel secondary lining zero-defect construction method |
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