CN108661671B - Vacuum auxiliary pouring method for tunnel vault secondary lining concrete - Google Patents
Vacuum auxiliary pouring method for tunnel vault secondary lining concrete Download PDFInfo
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- CN108661671B CN108661671B CN201810469571.8A CN201810469571A CN108661671B CN 108661671 B CN108661671 B CN 108661671B CN 201810469571 A CN201810469571 A CN 201810469571A CN 108661671 B CN108661671 B CN 108661671B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 35
- 239000011800 void material Substances 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 7
- 239000000565 sealant Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 10
- 238000009434 installation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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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
- E21D11/105—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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- 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
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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)
Abstract
The invention provides a vacuum auxiliary pouring method for tunnel vault secondary lining concrete, which belongs to the technical field of tunnel construction and comprises the following steps: the lining trolley is in place, an end template, an exhaust pipe and a concrete conveying pipe are installed and sealed, one end of the vault template is in contact with the finished vault two lining, the other end of the vault template is connected with the end template, the concrete conveying pipe above the end template is arranged at the top of a concrete reinforcing layer above the vault template, and a sealing ring matched with a vault main rib is arranged on the inner side of a preformed hole matched with the vault main rib on the end template; the exhaust pipe is communicated with the vacuum pump, and the concrete conveying pipe is communicated with the conveying pump to perform secondary lining concrete pouring; and removing the end head template, the vacuum pump and the concrete conveying pipe after the concrete is finally solidified. The secondary lining concrete of the tunnel vault is poured by utilizing a vacuumizing auxiliary means, so that the common quality problems of insufficient concrete pouring thickness, structural variation, low strength and the like of the vault part are overcome, the structural stress of the tunnel vault part is more in line with the design intention, and the bearing capacity of the tunnel vault part is improved.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a vacuum auxiliary pouring method for tunnel vault two-lining concrete.
Background
With the rapid development of tunnel engineering technology, the waterproof plate and drainage blind pipe technology is gradually popularized and used from the 90 th century, so that the water leakage of a tunnel vault is effectively controlled; the lining trolley and pumping concrete technology is adopted to replace the original arch frame, small template and manual feeding technology of arch-first and wall-second, so that the rapid construction of the two lining full section surfaces of the tunnel concrete is realized, and the comprehensive construction quality is greatly improved.
The lining trolley consists of a movable supporting frame, a vault template, a side wall template, an end template and the like, wherein the design length of the trolley is 9m or 12m, the vault template is provided with a preformed hole for installing a grouting pipe, attached vibrators are arranged at the back of the vault template and the back of the side wall template at a certain interval, and a pump pipe feeding port is arranged on the end template. Under the combined actions of factors such as over excavation of vault tunneling, lower position of a concrete feeding port pumped by an end template, falling of concrete through vibration and the like, the phenomena of secondary lining concrete and vault void are easy to occur; the vault is more seriously emptied under the influence of larger dry shrinkage of the pumped concrete than that of the concrete. Therefore, after the concrete reaches a certain strength, the grouting process is adopted to fill the vault in a void.
The tunnel vault two lining is designed into an arch structure, at present, as the vault is seriously emptied, the highest part of the vault forms a horizontal plane for reducing the elevation, namely the arch structure is changed into a local plate structure, the design intention is seriously violated, the bearing capacity of the vault part structure is reduced, the grouting filling treatment is carried out, but the strength of the cement paste after solidification is far lower than the concrete strength, and the design strength still cannot be reached; and the dry shrinkage of the cement paste is more obvious, and a certain dry shrinkage and void can also appear after the grouting.
Disclosure of Invention
The invention aims to provide a vacuum auxiliary pouring method for concrete of a tunnel vault secondary lining, which aims to solve the technical problem that the bearing capacity of a vault part structure is reduced due to the phenomenon that the secondary lining concrete and a vault are empty at the highest part of the tunnel vault secondary lining in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: the vacuum auxiliary pouring method for the tunnel vault secondary lining concrete comprises the following steps:
lining trolley is in place: moving the lining trolley to the lower part of the concrete reinforcing layer, and lifting the lining trolley support to enable a vault form on the lining trolley to be tightly attached to the bottom of the concrete reinforcing layer, so that one end of the vault form is contacted with the completed vault two-lining;
installing an end template: the method comprises the steps that a sealing ring is sleeved at the exposed end of a vault main rib embedded in a concrete reinforcing layer, a corresponding reserved hole in an end template penetrates through the vault main rib, meanwhile, the end template is matched with a water stop belt, the lower end of the end template is connected with the other end of the vault template, a sealing structure is paved between a waterproof plate paved by clinging to vault surrounding rocks and the end template to seal, and positioning of the end template is completed;
and (3) installing an exhaust pipe and a concrete conveying pipe: installing a concrete conveying pipe on the upper part of the end template, wherein the concrete conveying pipe is arranged on the top of the concrete reinforcing layer; a reserved hole for installing an exhaust pipe is reserved in advance when the concrete reinforcing layer is constructed, the exhaust pipe used for being connected with a vacuum pump is installed in the reserved hole, and the upper end of the exhaust pipe extends to a top void area of the concrete reinforcing layer;
and (3) casting secondary lining concrete: opening an exhaust pipe to automatically exhaust; conveying the secondary lining concrete to a void area above the concrete reinforcing layer of the vault through a concrete conveying pipe by a conveying pump until the concrete cannot be poured, and switching on a vacuum pump to start pumping air outside the exhaust pipe so as to form certain negative pressure in the void area above the concrete reinforcing layer of the vault; continuing pouring concrete into the concrete conveying pipe until the concrete fills the void area of the vault;
after the concrete is finally set, the vacuum pump and the concrete conveying pipe are removed, and the exhaust pipe is reserved and used as a post-vault grouting pipe; and removing the end head template, lowering the lining trolley support, and moving the lining trolley to the next operation point.
Further, when the lining trolley is in place, the vault form overlaps the finished vault secondary by 30cm.
Further, the exhaust pipe is disposed near one side of the finished dome liner.
Further, control valves are arranged between the concrete conveying pipe and the conveying pump and between the vacuum pump and the exhaust pipe.
Further, a groove matched with the water stop is formed in the outer side of the end head template.
Further, the sealing structure comprises a circumferential compression sealing rubber belt embedded between the end head template and the waterproof board, and the circumferential compression sealing rubber belt is fixedly connected with the end head template and the waterproof board through sealing glue.
Further, the sealing ring is a rubber gasket.
Further, a sealing piece matched with the vault main rib is arranged on the outer side of the end head template.
Further, the sealing element comprises a first sleeve fixed outside the reserved hole on the end head template and a second sleeve matched with the exposed length of the vault main rib, and the first sleeve and the second sleeve are connected and fixed through a connecting pipe fitting; the end of the second sleeve is a closed end.
Further, the matching parts of the two ends of the connecting pipe fitting, the first sleeve and the second sleeve are coated with sealant.
The vacuum auxiliary pouring method for the tunnel vault two-lining concrete has the beneficial effects that: compared with the prior art, the vacuum auxiliary pouring method for the tunnel vault secondary lining concrete can seal the void area between the top of the concrete reinforcing layer and the vault surrounding rock by utilizing the poured partial secondary lining concrete, the vault template, the end template and the waterproof board, and utilize the conveying pump to pour the concrete into the void area through the concrete conveying pipe, and simultaneously, the top void area of the concrete reinforcing layer is vacuumized by the air extractor, so that a certain negative pressure is formed in the inner cavity of the void area. The invention can improve the concrete thickness and lining strength of the vault part, so that the tunnel roof secondary lining forms an arch structure, meets the design purpose, improves the bearing capacity of the vault part structure, and is suitable for the construction occasions of cast-in-place concrete secondary lining of tunnels such as railways, highways, subways and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of installation of a crown form and an end form in a method for vacuum assisted casting of tunnel vault two-lining concrete according to an embodiment of the present invention;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a schematic view of the installation of the seal member of FIG. 1 with the exterior of the end form engaging the dome main rib;
wherein, each reference sign in the figure:
1. the concrete sealing device comprises a vault formwork, a head formwork, a groove, a first sleeve, a pipe fitting, a second sleeve, a sealing ring, a sealing rubber ring, a waterproof board, a water stop, an exhaust pipe, a concrete conveying pipe, a concrete reinforcing layer, a vault surrounding rock, a vault lining, a construction joint, a vault main rib, a sealing rubber ring and a void area.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The vacuum auxiliary pouring method for the tunnel vault secondary lining concrete provided by the invention is now described. The vacuum auxiliary pouring method for the tunnel vault secondary lining concrete comprises the following steps:
1. lining trolley is in place: and (3) moving the lining trolley to the lower part of the concrete reinforcing layer, and lifting the lining trolley support to tightly attach the vault form on the lining trolley to the bottom of the concrete reinforcing layer so that one end of the vault form is contacted with the finished vault two-lining. In order to avoid slurry leakage of the construction joint between adjacent concrete reinforcing layers in the secondary lining pouring process, when the lining trolley is in place, the vault form and the finished vault secondary lining can be lapped for 30cm.
2. Installing an end template: and a sealing ring is sleeved at the exposed end of the vault main rib embedded in the concrete reinforcing layer, a corresponding preformed hole on the end template penetrates through the vault main rib, meanwhile, the end template is matched with the water stop belt, the lower end of the end template is connected with the other end of the vault template, a sealing structure is paved between a waterproof plate paved by clinging to vault surrounding rocks and the end template to seal, and the positioning of the end template is completed.
3. And (3) installing an exhaust pipe and a concrete conveying pipe: installing a concrete conveying pipe on the upper part of the end template, wherein the concrete conveying pipe is arranged on the top of the concrete reinforcing layer; the method comprises the steps of reserving a reserved hole for installing an exhaust pipe in advance when the concrete reinforcing layer is constructed, installing the exhaust pipe connected with a vacuum pump in the reserved hole, and enabling the upper end of the exhaust pipe to extend to a top void area of the concrete reinforcing layer.
4. And (3) casting secondary lining concrete: opening an exhaust pipe to automatically exhaust; conveying the secondary lining concrete to the area above the concrete reinforcing layer of the vault through a concrete conveying pipe by a conveying pump until the concrete cannot be poured in, and switching on a vacuum pump at the outer side of the exhaust pipe to start pumping air, so that a certain negative pressure is formed in the void area above the concrete reinforcing layer of the vault; continuing pouring concrete into the concrete conveying pipe until the concrete fills the void area of the vault; and after the concrete pouring is finished, the concrete pump pipe and the exhaust pipe control valve are closed in time.
5. After the concrete is finally set, the vacuum pump and the concrete conveying pipe are removed, and the exhaust pipe is reserved and used as a post-vault grouting pipe; and removing the end head template, lowering the lining trolley support, and moving the lining trolley to the next operation point.
Compared with the prior art, the vacuum auxiliary pouring method for the concrete of the tunnel vault two lining has the advantages of convenience in operation, good sealing effect and strong bearing capacity of a vault part structure, the vault template, the end template, the waterproof board and the surrounding sealing structure are used for sealing a void area between the top of the concrete reinforcing layer and vault surrounding rock, the air extractor is used for vacuumizing the void area above the top surface of the concrete reinforcing layer, a certain negative pressure is formed in the inner cavity of the void area, and the concrete is poured into the void area through the concrete conveying pipe by the conveying pump. The vacuum auxiliary means is utilized to overcome the common quality problems of insufficient concrete casting thickness, structural variation (arch shape is changed into plate shape), low strength and the like at the arch part, so that the structural stress at the arch part of the tunnel better accords with the design intention, and the service life of the tunnel is prolonged. The invention is suitable for the cast-in-situ construction occasion of the secondary lining concrete of the tunnels of railways, highways, subways and the like.
Further, referring to fig. 1, as a specific embodiment of the method for vacuum-assisted pouring of concrete for a tunnel vault, the air extractor includes an air exhaust pipe 5 connected to a vacuum pump, the air exhaust pipe 5 is disposed in the concrete reinforcing layer 7, one end of the air exhaust pipe 5 extends to a top void area of the concrete reinforcing layer 7, and the other end of the air exhaust pipe extends below the vault form 1 and is connected to the vacuum pump. Starting a vacuum pump, pumping the top void area of the concrete reinforcing layer into a negative pressure state by utilizing the exhaust pipe, facilitating concrete pouring of the void area by the concrete conveying pipe, avoiding air in the concrete in the pouring process, ensuring the pouring quality of the concrete, enabling the two liners at the top of the tunnel to form an arch structure, and improving the bearing capacity of the arch part structure.
Further, referring to fig. 1, as a specific embodiment of the vacuum-assisted pouring method for the tunnel vault secondary lining concrete provided by the invention, the exhaust pipe 5 is arranged near one side of the completed vault secondary lining 9. The arrangement is convenient for evacuating the void area, and the concrete pouring is not disturbed.
Further, referring to fig. 1, as a specific embodiment of the vacuum-assisted pouring method for tunnel vault two-lining concrete provided by the invention, control valves are provided between the concrete conveying pipe 6 and the conveying pump, and between the vacuum pump and the exhaust pipe 5. The control valve is utilized to facilitate the installation and the opening and closing of the exhaust pipe and the concrete conveying pipe, the control valve and the plug are installed at the exposed end of the exhaust pipe which is installed on the arch form at the tail part of the lining trolley in advance, and the vacuum pump is removed from the plug to provide vacuum degree (negative pressure) for the partial emptying area of the arch, so that conditions are created for concrete pumping pouring; and a control valve on the concrete conveying pipe is used for preventing concrete from leaking and losing after the concrete pouring is finished.
Further, referring to fig. 1 and 2, as a specific implementation manner of the vacuum-assisted pouring method for the tunnel vault secondary lining concrete provided by the invention, a groove 2-1 matched with a water stop 4 is arranged on the outer side of the end template 2, the water stop is conveniently installed between two adjacent vault secondary linings by means of the groove, and meanwhile, air leakage at the position where the water stop is installed on the end template is avoided.
Further, referring to fig. 1 and 2, as a specific embodiment of the vacuum-assisted pouring method for tunnel vault secondary concrete provided by the invention, the sealing structure includes a circumferential compression sealing rubber belt 2-6 embedded between the end form 2 and the waterproof board 3, and the circumferential compression sealing rubber belt 2-6 is fixedly connected with the end form 2 and the waterproof board 3 through a sealant. And the sealing effect of the void area is ensured by sealing the top of the end template and the waterproof board through the circumferential compression sealing rubber belt and the sealant.
Further, as a concrete implementation mode of the vacuum auxiliary pouring method for the tunnel vault secondary lining concrete, the sealing rings 2-5 are rubber gaskets. And the reserved hole for installing the vault main rib on the end template is sealed by using a rubber gasket, so that slurry leakage is prevented in the casting process.
Further, referring to fig. 1 and 3, as a specific embodiment of the vacuum-assisted pouring method for tunnel vault two-lining concrete provided by the invention, a sealing member matched with the vault main rib 10 is arranged on the outer side of the end form 2. The sealing element can be arranged outside the main reinforcement of the upper vault, and the main reinforcement of the upper vault is close to the top surface of the concrete reinforcing layer, so that air can be introduced in the process of casting the secondary lining concrete due to the fact that sealing is not tight, and the vacuum degree effect of the upper void area is poor; and the cooperation of the vault main rib at the lower part and the end template is in the casting process, so that the concrete slurry can fully block the gap between the vault main rib and the end template, and the phenomenon of air leakage can be avoided.
The sealing element comprises a first sleeve 2-2 fixed outside a reserved hole on the end head template 2 and a second sleeve 2-4 matched with the exposed length of the vault main rib 10, and the first sleeve 2-2 and the second sleeve 2-4 are fixedly connected through a connecting pipe fitting 2-3. The two ends of the connecting pipe fitting are provided with internal threads, one end of the first sleeve and one end of the second sleeve, which are matched with the connecting pipe fitting, are provided with external threads, the first sleeve and the second sleeve are matched with the connecting pipe fitting in a threaded manner, and the reserved hole of the dome main rib on the end head template is sealed when the installation and the disassembly are convenient; wherein one end of the second sleeve 2-4 is a closed end.
Further, referring to fig. 1 and 3, as a specific embodiment of the vacuum-assisted pouring method for tunnel vault two-lining concrete provided by the present invention, a sealant is coated at the matching position between the two ends of the connecting pipe 2-3 and the first sleeve 2-2 and the second sleeve 2-4. The sleeve sealant further seals the reserved hole of the arch crown main rib installed on the end template, and further ensures the sealing effect.
Referring to fig. 1 and 2, an installation schematic diagram of a dome template and an end template in an embodiment of the present invention includes the following specific construction steps:
1. placing the lining trolley in place, and overlapping the vault template with the completed vault secondary lining for 30cm when the lining trolley is in place;
2. installing an end template, penetrating the lap joint main rib into the rubber gasket and then extending out of the end template, wherein the outer end of the upper vault main rib is in sealing connection with the connecting pipe fitting through a first sleeve and a second sleeve; placing the water stop in a water stop groove of the end template; a circumferential compression sealing rubber belt is pressed between the top of the end head template and the waterproof board and is tightly sealed by sealing rubber;
3. a PVC exhaust pipe and a control valve are arranged in a reserved hole at the arch top part of the rear end of the lining trolley;
4. vacuum auxiliary casting of secondary lining concrete: opening the exhaust pipe and the control valve to facilitate automatic exhaust; when the secondary lining concrete is poured to the vault part according to the prior pumping and vibrating process, when the concrete cannot be poured, a vacuum pump is connected to the outer side of a control valve of an exhaust pipe to start pumping air, so that a certain negative pressure is formed in a vault cavity; a concrete pumping pipeline is communicated with the concrete conveying pipe at the vault part of the end template and the outer side of the control valve, and concrete is poured into the vault by opening the control valve; and after the cavity of the vault void area is filled with concrete, the control valves on the two sides are closed in time, so that the poured concrete is prevented from flowing out.
5. Removing the exhaust pipe control valve after the concrete is finally set, and using the exhaust pipe as a post-vault grouting pipe; and removing the end head template, lowering the lining trolley support, and moving the lining trolley to the next operation point. Before the concrete of the tunnel vault secondary lining is poured, the following sealing operation is needed:
1. forming a seal between the dome and the surrounding rock by utilizing the waterproof function of the waterproof board;
2. forming a seal at the rear of the lining trolley by using a water stop strip between two concrete arch top secondary lining construction joints and a cast-in-situ arch top secondary lining;
3. forming two-side seals by utilizing cast-in-place concrete of the arch crown two liners of the side walls;
4. forming a seal between the bottom of the end form and the vault form by using cast-in-situ concrete;
5. sealing between the top of the end template and the vault waterproof board is formed by utilizing elastic circumferential compression sealing rubber bands and sealing glue;
6. the sealing piece outside the reserved hole on the end template is used for overlapping the vault main rib, and meanwhile, the rubber gasket is arranged on the inner side of the end template to prevent slurry leakage;
7. the first sleeve, the second sleeve and the connecting pipe fitting which are arranged on the outer side of the end head template and overlap with the vault main rib are utilized, and the sealing glue is used for sealing the matching surface to prevent air leakage;
8. the exhaust pipe, the control valve and the plug which are arranged on the arch cover template at the tail part of the lining trolley in advance are utilized, a vacuum pump is arranged to provide a certain vacuum degree (negative pressure) for the arch cover part, and conditions are created for concrete pumping pouring;
9. and the concrete delivery pipe and the control valve fixed on the end template are utilized to prevent concrete from losing after the concrete pouring is finished.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The vacuum auxiliary pouring method for the tunnel vault secondary lining concrete is characterized by comprising the following steps of:
lining trolley is in place: moving the lining trolley to the lower part of the concrete reinforcing layer, and lifting the lining trolley support to enable a vault form on the lining trolley to be tightly attached to the bottom of the concrete reinforcing layer, so that one end of the vault form is contacted with the completed vault two-lining;
installing an end template: the method comprises the steps that a sealing ring is sleeved at the exposed end of a vault main rib embedded in a concrete reinforcing layer, a corresponding reserved hole in an end template penetrates through the vault main rib, meanwhile, the end template is matched with a water stop belt, the lower end of the end template is connected with the other end of the vault template, a sealing structure is paved between a waterproof plate paved by clinging to vault surrounding rocks and the end template to seal, and positioning of the end template is completed; the sealing structure comprises a circumferential compression sealing rubber belt embedded between the end head template and the waterproof board, and the circumferential compression sealing rubber belt is fixedly connected with the end head template and the waterproof board through sealing glue;
and (3) installing an exhaust pipe and a concrete conveying pipe: installing a concrete conveying pipe on the upper part of the end template, wherein the concrete conveying pipe is arranged on the top of the concrete reinforcing layer; a reserved hole for installing an exhaust pipe is reserved in advance when the concrete reinforcing layer is constructed, the exhaust pipe used for being connected with a vacuum pump is installed in the reserved hole, and the upper end of the exhaust pipe extends to a top void area of the concrete reinforcing layer;
and (3) casting secondary lining concrete: opening an exhaust pipe to automatically exhaust; conveying the secondary lining concrete to a void area above the concrete reinforcing layer of the vault through a concrete conveying pipe by a conveying pump until the concrete cannot be poured, and switching on a vacuum pump to start pumping air outside the exhaust pipe so as to form certain negative pressure in the void area above the concrete reinforcing layer of the vault; continuing pouring concrete into the concrete conveying pipe until the concrete fills the void area of the vault;
after the concrete is finally set, the vacuum pump and the concrete conveying pipe are removed, and the exhaust pipe is reserved and used as a post-vault grouting pipe; and removing the end head template, lowering the lining trolley support, and moving the lining trolley to the next operation point.
2. The method for vacuum assisted casting of tunnel vault secondary concrete according to claim 1, wherein: when the lining trolley is in place, the vault form overlaps the finished vault secondary by 30cm.
3. The method for vacuum assisted casting of tunnel vault secondary concrete according to claim 2, wherein: the exhaust pipe is arranged near one side of the finished arch crown two lining.
4. The method for vacuum assisted casting of tunnel vault secondary concrete according to claim 2, wherein: control valves are arranged between the concrete conveying pipe and the conveying pump and between the vacuum pump and the exhaust pipe.
5. The method for vacuum assisted casting of tunnel vault secondary concrete according to claim 1, wherein: and grooves matched with the water stop belts are formed in the outer sides of the end templates.
6. The method for vacuum assisted casting of tunnel vault secondary concrete according to claim 1, wherein: the sealing ring is a rubber gasket.
7. A method of vacuum assisted casting of tunnel vault secondary concrete as claimed in any one of claims 1 to 6 wherein: and a sealing piece matched with the vault main rib is arranged on the outer side of the end head template.
8. The method for vacuum assisted casting of tunnel vault secondary concrete of claim 7, wherein: the sealing element comprises a first sleeve fixed outside a preformed hole on the end head template and a second sleeve matched with the exposed length of the arch crown main rib, and the first sleeve and the second sleeve are connected and fixed through a connecting pipe fitting; the end of the second sleeve is a closed end.
9. The method for vacuum assisted casting of tunnel vault secondary concrete of claim 8, wherein: and the matching parts of the two ends of the connecting pipe fitting and the first sleeve and the second sleeve are coated with sealant.
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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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| CN201810469571.8A CN108661671B (en) | 2018-05-16 | 2018-05-16 | Vacuum auxiliary pouring method for tunnel vault secondary lining concrete |
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|---|---|---|---|---|
| CN109184751B (en) * | 2018-11-16 | 2024-05-10 | 中铁隧道集团一处有限公司 | Endoscopic type air-raid shelter monitoring device and monitoring method for tunnel lining vault |
| CN110486037B (en) * | 2019-08-26 | 2024-04-05 | 中铁二局第一工程有限公司 | Construction structure and method for preventing double-lining vault from being hollow for railway tunnel vault |
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| CN113323694B (en) * | 2021-06-29 | 2024-02-20 | 重庆科技学院 | Negative pressure grouting process for tunnel lining cavity |
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