CN113803088B - Isolated double-lining shield tunnel construction structure and construction method - Google Patents
Isolated double-lining shield tunnel construction structure and construction method Download PDFInfo
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- CN113803088B CN113803088B CN202111135886.7A CN202111135886A CN113803088B CN 113803088 B CN113803088 B CN 113803088B CN 202111135886 A CN202111135886 A CN 202111135886A CN 113803088 B CN113803088 B CN 113803088B
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- 238000010276 construction Methods 0.000 title claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000002955 isolation Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000009415 formwork Methods 0.000 claims description 20
- 230000005641 tunneling Effects 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000004745 nonwoven fabric Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 210000000214 mouth Anatomy 0.000 description 35
- 238000000465 moulding Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
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- 230000007774 longterm Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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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
- E21D11/102—Removable shuttering; Bearing or supporting devices 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention discloses an isolated double-lining shield tunnel construction structure and a construction method, wherein the construction structure comprises a primary lining, an isolated buffer layer and a secondary lining, wherein the bottoms of two sides of the isolated buffer layer are respectively provided with a water collecting pipe, and a plurality of water drain pipes are arranged between the water collecting pipes and a mouth piece box culvert; the method comprises the steps of firstly, constructing a primary lining and a mouth piece box culvert; 2. a water collecting pipe and a water drain pipe are arranged; 3. constructing an inverted arch filling layer; 4. constructing an isolation buffer layer; 5. constructing a secondary lining below the tunnel waist line; 6. and constructing secondary lining between the middle partition wall, the air duct plate and the tunnel waist line and the air duct plate. The invention can effectively reduce the damage of the secondary lining structure caused by the water leakage of the primary lining, improves the construction efficiency, adopts the special template trolley to synchronously construct the air duct plate and the intermediate wall, can realize the synchronous construction of the residual structure under the condition of not influencing the material transportation, and has the advantages of quick assembly, quick positioning, quick die removal and short process circulation time.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering construction, and particularly relates to an isolated double-lining shield tunnel construction structure and a construction method.
Background
In recent years, large shield tunnels in China have the advantages of large quantity of projects, large construction scale, complex construction technology difficulty and high development speed. Especially under the trend of large section, deep burying and high water pressure of subways, highway tunnels and high-speed railway tunnels, in the process of constructing large-scale underwater shield tunnels, china starts to try to use a composite lining type of 'duct pieces and secondary lining', and a composite lining structure is formed by molding concrete secondary lining on the inner side of the shield duct pieces and duct piece lining, so that the durability of the tunnel structure is effectively improved.
Disadvantages and shortcomings of providing a liner:
(1) The primary lining is water-leaking, and water is easy to generate water pressure between the inner circular arc and the duct piece after long-term retention, so that the secondary lining structure is influenced;
(2) The shield tunnel segments are connected by bolts, and the whole stress state is flexible; the inner arc lining is formed by whole mould cast-in-situ, the allowable deformation is relatively small, and the whole stress state deviates from rigidity; the inner arc lining in the overlapped structure form can influence the deformation of the duct piece to a certain extent, especially under abrupt change working conditions such as earthquake and the like;
(3) The synchronous construction with the shield has larger influence on the progress of the shield tunneling construction;
(4) In the traditional construction process, a pi-shaped template trolley is firstly adopted to construct an air duct plate, and after a tunnel is penetrated, the air duct plate is used as an intermediate wall, and mainly because the span of the air duct plate is overlarge, the concrete form removal strength is required to be 100% according to related standard requirements, so that the construction cost is high and the overall construction period is long.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an isolated double-lining shield tunnel construction structure which has reasonable structural design and convenient and fast construction, effectively reduces the damage of a secondary lining structure caused by the water leakage of a primary lining, realizes synchronous implementation of shield tunneling and lining, improves construction work efficiency and provides reference for the construction of a double-lining inner structure of a similar large-diameter single-hole double-line tunnel; the rapid construction process for synchronously implementing the air duct plate and the intermediate wall by adopting the special template trolley can realize synchronous construction operation of the residual structure without affecting material transportation, and has the advantages of fast movement, fast assembly, fast positioning, fast die removal, short process circulation time and the like.
In order to solve the technical problems, the invention adopts the following technical scheme: an isolated double-lining shield tunnel construction structure which is characterized in that: including setting up the primary lining in the tunnel cave body to and set up secondary lining and the inverted arch screed-coat in the primary lining, the primary lining includes the multiple ring section of jurisdiction, the inverted arch screed-coat sets up between the both sides bottom of secondary lining, be provided with the isolation buffer layer between primary lining and the secondary lining, be provided with the intermediate wall on the inverted arch screed-coat, be provided with the wind channel board on the intermediate wall, the bottom of inverted arch screed-coat is provided with a mouthful sub-box culvert and inverted arch filling layer, a mouthful sub-box culvert includes a plurality of prefabricated mouthful sub-pieces, the both sides bottom of isolation buffer layer is provided with a collector pipe respectively, a plurality of inlet openings have been seted up on the collector pipe, the collector pipe is laid along the extending direction of tunnel, be provided with a plurality of bleeder pipes between collector pipe and the mouthful sub-box culvert.
Foretell an isolated double-lining shield tunnel construction structure, its characterized in that: two sides of the intermediate wall are respectively provided with an evacuation platform, the two evacuation platforms are symmetrically arranged at the bottoms of the two sides of the intermediate wall, and the evacuation platforms are mutually perpendicular to the intermediate wall.
Foretell an isolated double-lining shield tunnel construction structure, its characterized in that: the two ends of the air duct plate are respectively connected to the secondary lining on two sides of the tunnel, the air duct plate is mutually perpendicular to the intermediate wall, and the intermediate wall is mutually perpendicular to the inverted arch leveling plate.
Foretell an isolated double-lining shield tunnel construction structure, its characterized in that: one end of the water drain pipe is communicated with the water collecting pipe through a three-way pipeline, and the other end of the water drain pipe is communicated with the internal channel of the mouth piece box culvert after being inclined downwards.
Foretell an isolated double-lining shield tunnel construction structure, its characterized in that: the inverted arch leveling plates are arranged along the extending direction of the tunnel, the lower surfaces of the inverted arch leveling plates are arranged close to the upper surfaces of the box culverts of the opening sub-pieces, and the included angle between the drain pipe and the inverted arch leveling plates is 10-15 degrees.
Foretell an isolated double-lining shield tunnel construction structure, its characterized in that: the water inlet holes on the water collecting pipe are distributed in a multi-row staggered mode, and the non-woven fabric water permeable layer wraps the outside of the water collecting pipe.
Meanwhile, the invention also discloses a construction method of the isolated double-lining shield tunnel structure, which is characterized by comprising the following steps:
Step one, constructing a primary lining and a mouth piece box culvert: in the process of tunneling the tunnel shield, assembling the segments in the tunnel body from front to back to form a primary lining, and assembling prefabricated mouth pieces at the bottom of the tunnel body from front to back to form a mouth piece box culvert;
step two, installing a water collecting pipe and a water drain pipe: when the construction length of the primary lining reaches a set length, sequentially connecting a plurality of water collecting pipe segments through a tee joint along the extending direction of the tunnel at the bottom of the constructed primary lining to form a water collecting pipe;
Each water collecting pipe section is provided, the outer side of each water collecting pipe section is wrapped with a non-woven fabric permeable layer, each tee joint is provided with a water drain pipe, and one end, far away from the water collecting pipe, of the water drain pipe extends into a through hole reserved in the prefabricated mouth piece;
Step three, constructing an inverted arch filling layer: backfilling concrete poured from front to back on two sides of a box culvert of an opening part at the position where the water collecting pipe section is installed every time the water collecting pipe section is installed, so as to form an inverted arch filling layer;
Fourthly, constructing an isolation buffer layer: when the concrete strength of the constructed inverted arch filling layer in the third step reaches the design strength, arranging an isolation buffer layer on the surface of the primary lining at the position corresponding to the inverted arch filling layer, wherein the concrete strength of the primary lining reaches the design strength;
Step five, constructing secondary lining below the tunnel waistline: pouring concrete to the lower parts of the waist parts at the two sides of the constructed isolation buffer layer from front to back by adopting a shaping small steel template system to form a bottom secondary lining;
Step six, constructing secondary lining between the intermediate wall, the air duct plate and the tunnel waist line to the air duct plate: after tunneling of the tunnel shield is completed, pouring construction is carried out at the designed positions of the middle partition wall, the air duct plate and the middle secondary lining from front to back by adopting a special template trolley, so that the middle partition wall, the air duct plate and the middle secondary lining are formed;
The special template trolley comprises two symmetrically arranged template trolley units, each template trolley unit comprises an assembled template and a template supporting framework matched with the assembled template, the assembled template comprises a middle arc-shaped template for forming a middle secondary lining, a vertical template for forming an intermediate wall and a horizontal template for forming an air duct plate, a plurality of opposite-pull screws are connected between the two vertical templates, and a gap matched with the thickness of the intermediate wall is formed between the two vertical templates;
Step seven, constructing an inverted arch leveling plate and a vault secondary lining: when the concrete strength of the air duct plate meets the design requirement, pouring concrete on the upper surfaces of the box culvert of the mouth piece and the filling layer of the inverted arch to construct an inverted arch leveling plate, and constructing the top secondary lining on the air duct plate by adopting a small template trolley on the upper part of the constructed air duct plate.
The construction method is characterized in that: the small shaping steel template system adopted in the fifth step comprises a bottom arc-shaped template and a template supporting frame body which are matched with the inner wall of the primary lining, wherein the template supporting frame body comprises a plurality of right triangle supports which are sequentially connected along the extending direction of a tunnel, a plurality of pushing oil cylinders for pushing the bottom arc-shaped template are sequentially arranged on the hypotenuse of each right triangle support from top to bottom, one ends of the pushing oil cylinders are hinged to the right triangle supports, and the other ends of the pushing oil cylinders are hinged to the bottom arc-shaped template;
The right triangle supports are parallel to each other, and two rollers are arranged at the bottom of each right triangle support;
And the included angles between the pushing cylinders on the right triangle support and the horizontal plane are gradually increased from top to bottom.
The construction method is characterized in that: in the sixth step, a first horizontal connecting section template for connecting with the horizontal template is arranged at the upper end of the middle arc-shaped template, the first horizontal connecting section template and the middle arc-shaped template are integrally formed, the first horizontal connecting section template is hinged to one side of the horizontal template, a second horizontal connecting section template for connecting with the horizontal template is arranged at the upper end of the vertical template, the second horizontal connecting section template and the vertical template are integrally formed, and the second horizontal connecting section template is hinged to the other side of the horizontal template;
The template support framework is a cube frame body, the horizontal template is arranged at the top of the template support framework through two I-shaped steels, a pushing oil cylinder for pushing the middle arc-shaped template is arranged on one side of the template support framework, and a pushing oil cylinder for pushing the vertical template is arranged on the other side of the template support framework;
And a plurality of adjusting screws which play a supporting role are connected between the middle arc-shaped template and the template supporting framework and between the vertical template and the template supporting framework.
The construction method is characterized in that: in the sixth step, a jacking oil cylinder is arranged at each corner of the bottom of the formwork support framework, the jacking oil cylinders are distributed along the height direction of the formwork support framework, the cylinder bodies of the jacking oil cylinders are fixed on one side of the formwork support framework, and a running mechanism is arranged at each piston rod end of each jacking oil cylinder.
Compared with the prior art, the invention has the following advantages:
1. According to the isolated double-lining shield tunnel construction structure, the isolation buffer layer is arranged between the primary lining and the secondary lining, and plays a role in buffering and isolating between the primary lining and the secondary lining, so that the secondary lining and the primary lining are prevented from being combined into a whole to bear surrounding rock pressure together, and further the damage force of the structure caused by the fact that the acting force of the primary lining is directly transmitted to the secondary lining is avoided.
2. According to the isolation type double-lining shield tunnel construction structure, the water collecting pipes are respectively arranged at the bottoms of the two sides of the isolation buffer layer, the water collecting pipes are connected with the mouth piece box culvert, accumulated water between the primary lining and the secondary lining can be collected through the water collecting pipes and discharged into the mouth piece box culvert through the water collecting pipes, and damage to the secondary lining structure caused by water leakage of the primary lining is effectively reduced.
3. According to the method, the secondary lining is respectively constructed by the bottom secondary lining, the middle secondary lining and the top secondary lining, and meanwhile, the construction of the middle partition wall, the air duct plate and the middle secondary lining is only carried out after the whole tunnel is integrally penetrated, so that the influence of the intercrossing interference of shield tunneling and lining construction in shield synchronous tunneling construction is effectively solved, synchronous implementation of shield tunneling and lining is realized, the construction efficiency is improved, and references are provided for the construction of double-layer lining internal structures of similar large-diameter single-hole double-line tunnels.
4. The method adopted by the invention can realize synchronous construction operation of the middle wall, the air duct plate and the middle secondary lining structure between the tunnel waist line and the air duct plate under the condition of not influencing material transportation by adopting the special template trolley, and has the advantages of fast movement, fast assembly, fast positioning, fast die removal, short process circulation time, reliable structure, convenient operation, good tunnel molding surface and the like.
In conclusion, the double-layer lining structure is reasonable in structural design, convenient and fast to construct, effectively reduces the damage of a secondary lining structure caused by the water leakage of the primary lining, realizes synchronous implementation of shield tunneling and lining, improves construction efficiency, and provides references for the construction of double-layer lining internal structures of similar large-diameter single-hole double-line tunnels; the rapid construction process for synchronously implementing the air duct plate and the intermediate wall by adopting the special template trolley can realize synchronous construction operation of the residual structure without affecting material transportation, and has the advantages of fast movement, fast assembly, fast positioning, fast die removal, short process circulation time and the like.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a cross-sectional view of an isolated double-lining shield tunnel construction structure of the present invention.
FIG. 2 is a schematic diagram of the structure of the modular steel form system of the present invention.
Fig. 3 is a schematic structural view of the special template trolley of the present invention.
Fig. 4 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-primary lining; 2-an isolation buffer layer; 3-secondary lining;
3-1, secondary lining of the bottom; 3-2-middle secondary lining; 3-top secondary lining;
4-inverted arch leveling plate; 5-an intermediate wall; 6, an air duct plate;
7, opening a box culvert; 8-an inverted arch filling layer; 9, a water collecting pipe;
10-a drain pipe; 11-evacuation platform; 12-a bottom arc-shaped template;
13-a template support frame body; 13-1-a right triangle support; 13-2, a roller;
14-pushing the oil cylinder; 15-1-a middle arc-shaped template; 15-2, a vertical template;
15-3-horizontal templates; 16-a split screw; 17-a template support framework;
18-adjusting the screw; 19-a jacking oil cylinder; 20-a travelling mechanism.
Detailed Description
The utility model provides an isolated double-lining shield tunnel construction structure as shown in fig. 1, including setting up primary lining 1 in the tunnel cave and setting up secondary lining 3 and the inverted arch leveling board 4 in primary lining 1, primary lining 1 includes the multiple ring section of jurisdiction, inverted arch leveling board 4 sets up between the both sides bottom of secondary lining 3, be provided with isolation buffer layer 2 between primary lining 1 and the secondary lining 3, be provided with intermediate wall 5 on the inverted arch leveling board 4, be provided with wind channel board 6 on the intermediate wall 5, the bottom of inverted arch leveling board 4 is provided with mouth piece box culvert 7 and inverted arch filling layer 8, mouth piece box culvert 7 includes a plurality of prefabricated mouthpieces, the both sides bottom of isolation buffer layer 2 is provided with a water collecting pipe 9 respectively, a plurality of inlet openings have been seted up on the water collecting pipe 9, water collecting pipe 9 is laid along the extending direction of tunnel, be provided with a plurality of water pipes 10 between water collecting pipe 9 and the mouth piece box culvert 7, water pipe 10 and water collecting pipe 9 mutually perpendicular.
During practical use, the isolation buffer layer 2 is a plate with a certain compression amount, the thickness of the plate is 2cm, the segments of the primary lining 1 are connected by bolts to form a flexible stress structure, the secondary lining 3 is of a cast-in-situ integral structure and is considered as a rigid structure, the isolation buffer layer 2 is arranged between the primary lining 1 and the secondary lining 3, the isolation buffer layer 2 plays a role in buffering and isolating between the primary lining 1 and the secondary lining 3, the secondary lining 3 and the primary lining 1 are prevented from being combined into a whole to bear surrounding rock pressure together, and further the damage force of the structure caused by the fact that the acting force of the primary lining 1 is directly transmitted to the secondary lining 3 is avoided.
It should be noted that, long-term operation vibration of the subway and formation change may cause excessive deformation such as opening and dislocation of the segment joint of the primary lining 1 to cause a certain amount of leakage water, if leakage occurs, a certain water pressure will act on the secondary lining 3, and the secondary lining 3 has smaller bearing capacity and may deform too much under the action of a larger water pressure to destabilize, affecting structural durability, so that water collecting pipes 9 are respectively arranged at the bottoms of two sides of the isolation buffer layer 2, accumulated water between the primary lining 1 and the secondary lining 3 can be collected through the water collecting pipes 9, and damage to the structure of the secondary lining 3 due to the leakage water of the primary lining 1 is effectively reduced.
In particular, by connecting a plurality of drain pipes 10 between the water collecting pipe 9 and the mouth piece box culvert 7, accumulated water in the water collecting pipe 9 can be effectively discharged into the mouth piece box culvert 7, and then the tunnel is discharged through the mouth piece box culvert 7, so that the drainage efficiency can be effectively ensured.
In specific implementation, the inverted arch leveling plate 4 is divided into a left section and a right section through the intermediate wall 5, and the bottom of the intermediate wall 5 is directly clung to the top of the box culvert 7 of the mouth piece.
In this embodiment, two sides of the intermediate wall 5 are respectively provided with an evacuation platform 11, two evacuation platforms 11 are symmetrically arranged at bottoms of two sides of the intermediate wall 5, and the evacuation platforms 11 are mutually perpendicular to the intermediate wall 5.
In actual use, the evacuation platform 11 is arranged on the intermediate wall 5, and the evacuation platform 11 is arranged close to the inverted arch leveling plate 4, and the width of the evacuation platform 11 is smaller than the width of the air duct plate 6 on one side of the intermediate wall 5.
In this embodiment, two ends of the air duct board 6 are respectively connected to the secondary lining 3 at two sides of the tunnel, the air duct board 6 is perpendicular to the intermediate wall 5, and the intermediate wall 5 is perpendicular to the inverted arch leveling plate 4.
In actual use, the air duct plate 6 and the intermediate wall 5 are integrally formed.
In this embodiment, one end of the drain pipe 10 is communicated with the water collecting pipe 9 through a three-way pipe, and the other end of the drain pipe 10 is inclined downward and then communicated with the internal channel of the mouth piece box culvert 7.
During actual use, through making the other end downward sloping of water drain pipe 10 and link up mutually with the internal passage of oral cavity sub-piece box culvert 7, the ponding in the water collecting pipe 9 of being convenient for is quick in the oral cavity sub-piece box culvert 7 through water drain pipe 10, and then avoids leading to ponding between primary lining 1 and the secondary lining 3 because of water collecting pipe 9 is filled with water.
In this embodiment, the inverted arch leveling plate 4 is disposed along the extending direction of the tunnel, the lower surface of the inverted arch leveling plate 4 is disposed close to the upper surface of the box culvert 7, and the included angle between the drain pipe 10 and the inverted arch leveling plate 4 is 10 ° to 15 °.
In this embodiment, the water inlet holes on the water collecting pipe 9 are arranged in a plurality of rows in a staggered manner, and the water collecting pipe 9 is wrapped with a non-woven fabric water permeable layer.
In actual use, by arranging a plurality of water inlets on the water collecting pipe 9, accumulated water between the primary lining 1 and the secondary lining 3 is convenient to enter the water collecting pipe 9 through the water inlets.
During concrete implementation, through the outside parcel at collector pipe 9 has non-woven fabrics permeable layer, can separate collector pipe 9 and secondary lining 3 and inverted arch filling layer 8, and then the ponding of being convenient for between primary lining 1 and the secondary lining 3 gets into in the collector pipe 9.
The construction method of the isolated double-lining shield tunnel structure shown in fig. 2 to 4 comprises the following steps:
Step one, constructing a primary lining and a mouth piece box culvert: simultaneously carrying out the assembly of the segments in the tunnel hole body and the assembly of the prefabricated mouth pieces from front to back while tunneling the tunnel shield until the construction of the primary lining 1 and the mouth piece box culvert 7 is completed;
When the tunnel lining is actually used, the primary lining 1 plays a main supporting role, so that the internal structure of the tunnel is not influenced by surrounding rock, the duct pieces of the primary lining 1 are assembled in a staggered joint manner, the duct pieces are assembled in a principle from top to bottom, a bottom standard block or an adjacent block is firstly assembled from the lower part, then the rest standard blocks and the adjacent blocks are symmetrically assembled, and finally a sealing top block is assembled; when the duct piece is assembled, firstly longitudinally compacting the annular water stop strip, then circumferentially compacting the longitudinal water stop strip, and finely adjusting the alignment bolt holes; tightening longitudinal and circumferential connecting bolts while assembling the duct pieces; and after the whole ring segment is separated from the shield tail, all the connecting bolts are screwed up again according to the regulation.
It should be noted that, the mouth piece box culvert 7 includes a plurality of prefabricated mouth pieces that connect gradually along tunnel extending direction, and the main role of mouth piece box culvert 7 is to ensure that the rubber tyer transport vechicle, fork truck, mortar tank car, etc. shield construction vehicles have flat transportation passageway, later stage is as tunnel with pipeline, cable placement, the passageway that the leakage water was collected. The box culvert 7 of the opening sub-part is a concrete prefabricated part, the prefabricated opening sub-part assembly construction is also synchronous with the shield tunneling construction, and the prefabricated opening sub-part assembly construction is moved and assembled through the box culvert crane in the connecting bridge area of the shield machine.
Step two, installing a water collecting pipe and a water drain pipe: when the construction length of the primary lining 1 reaches one kilometer, sequentially connecting a plurality of water collecting pipe segments through a tee joint along the extending direction of the tunnel at the bottom of the constructed primary lining 1 to form a water collecting pipe 9;
Wherein, each water collecting pipe section is provided, the outside of the water collecting pipe section is wrapped with a non-woven fabric permeable layer, each tee joint is provided with a water drain pipe 10, and one end of the water drain pipe 10, which is far away from the water collecting pipe 9, extends into a through hole reserved on the prefabricated mouth piece;
When in actual use, the water collecting pipe 9 is formed by connecting a plurality of water collecting pipe sections through tee joints, a water drain pipe 10 is arranged between every two adjacent water collecting pipe sections, when the construction of the water collecting pipe 9 and the water drain pipe 10 is carried out, firstly, the water collecting pipe sections are respectively installed at the bottoms of the two sides of the primary lining 1, then the water drain pipe 10 is connected to the rear ends of the water collecting pipe sections through the tee joints, one end of the water drain pipe 10 is installed in a through hole reserved in the prefabricated mouth piece, then, the water collecting pipe sections are respectively installed on the two tee joints, the water drain pipe 10 is installed again, and the method is repeated until the installation of the whole water collecting pipe 9 and the water drain pipes 10 is completed.
When in actual use, the water collecting pipe 9 and the water drain pipe 10 are HDPE double-wall corrugated pipes, and the main function is to drain and collect the water leakage between the primary lining 1 and the secondary lining 3 into the mouth piece box culvert 7, remove the accumulated water between the primary lining 1 and the secondary lining 3, and effectively reduce the damage of the structure of the secondary lining 3 caused by the water leakage of the primary lining 1.
The non-woven fabric permeable layer is wrapped on the outer side of the water collecting pipe 9, so that the water inlet hole of the water collecting pipe 9 is blocked by poured concrete when the inverted arch filling layer 8 is constructed, and the water collecting pipe 9 loses the functions of water collection and water drainage.
In the process of installing the water collecting pipe 9 and the water drain pipe 10, the primary lining 1 and the mouth piece box culvert 7 are still constructed synchronously with shield tunneling, and the construction of the water collecting pipe 9 and the water drain pipe 10 is not mutually interfered with the construction of the primary lining 1 and the mouth piece box culvert 7.
Step three, constructing an inverted arch filling layer: backfilling concrete poured from front to back on two sides of the box culvert 7 of the mouth piece at the position where the water collecting pipe section is installed every time the water collecting pipe section is installed, so as to form an inverted arch filling layer;
during actual use, the top area of the mouth piece box culvert 7 is narrow and small, the vehicle cannot be staggered, potential safety hazards exist on two sides of the mouth piece box culvert 7 in the near air, and the main function of backfilling on two sides of the mouth piece box culvert 7 is to ensure that shield construction vehicles such as rubber wheel transport vehicles, forklift trucks, mortar tank trucks and the like have flat and safe transport channels, so that the vehicle can be conveniently staggered.
The construction of the inverted arch filling layer 8 and the construction of the water collecting pipe 9 and the water drain pipe 10 do not interfere with each other, and the construction of the inverted arch filling layer 8 is performed while the construction of the water collecting pipe 9 and the water drain pipe 10 is performed, so that the installation of the water collecting pipe 9 and the water drain pipe 10 at the construction position of the inverted arch filling layer 8 is ensured when the inverted arch filling layer 8 is constructed.
Fourthly, constructing an isolation buffer layer: when the concrete strength of the constructed inverted arch filling layer in the third step reaches the design strength, the isolation buffer layer 2 is formed by bonding the plates with compression amount on the surface of the primary lining 1 at the position corresponding to the inverted arch filling layer 8 with the concrete strength reaching the design strength through glue;
When in actual use, before the construction of the isolation buffer layer 2, the surface of the segment structure of the primary lining 1 is firstly treated, if the surface of the structure has bright water or seepage, the seepage water is firstly treated.
The construction of the isolation buffer layer 2 and the construction of the inverted arch filling layer 8 do not interfere with each other, and when the isolation buffer layer 2 is constructed, it is necessary to ensure that the concrete strength of the inverted arch filling layer 8 at the construction position of the isolation buffer layer 2 reaches the design strength.
Step five, constructing secondary lining below the tunnel waistline: the lower parts of the waist parts at the two sides of the constructed isolation buffer layer 2 are concreted by a small shaping steel template system from front to back to form a bottom secondary lining 3-1;
In actual use, the secondary lining 3 is formed by splicing two bottom secondary linings 3-1, two middle secondary linings 3-2 and one top secondary lining 3-3.
The steps one to five are not interfered with each other, and the whole construction of a single step in the tunnel can be stopped after the completion, so that the construction is not influenced by other steps.
When the tunnel shield tunneling is finished, namely the whole tunnel is completely communicated, the construction of the secondary lining between the middle partition wall, the air duct plate and the tunnel waist line and the air duct plate in the step six can be carried out no matter whether the working procedures from the step one to the step five are finished or not, and the working procedures from the step one to the step six are not mutually interfered.
Step six, constructing secondary lining between the intermediate wall, the air duct plate and the tunnel waist line to the air duct plate: after the tunnel shield tunneling is completed, namely the whole tunnel is integrally communicated, pouring construction is carried out by adopting a special template trolley from front to back to the middle partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 between the tunnel waist line and the air duct plate;
The special template trolley comprises two symmetrically arranged template trolley units, each template trolley unit comprises an assembled template and a template supporting framework 17 matched with the assembled template, the assembled template comprises a middle arc-shaped template 15-1 for forming a middle secondary lining 3-2, a vertical template 15-2 for forming an intermediate wall 5 and a horizontal template 15-3 for forming an air duct plate 6, a plurality of opposite pull screws 16 are connected between the two vertical templates 15-2, and a gap matched with the thickness of the intermediate wall 5 is formed between the two vertical templates 15-2;
during practical use, special template platform truck structural design is simple, convenient operation, and construction precision is high, can realize the synchronous construction operation of intermediate wall 5, wind channel board 6 and tunnel waist line to the middle part secondary lining 3-2 structure between the wind channel board under the circumstances that does not influence the material transportation, has and removes fast, assemble fast, location fast, the demolding fast, process cycle time is short, the structure is reliable, convenient operation, tunnel molding surface advantage such as good.
It is to be noted that, through carrying out the construction respectively with secondary lining 3 divide bottom secondary lining 3-1, middle part secondary lining 3-2 and top secondary lining 3-3, just carry out the construction of intermediate wall 5, wind channel board 6 and middle part secondary lining 3-2 simultaneously after whole tunnel is whole link up, the effectual mutual cross interference influence of shield tunneling and lining construction among the shield synchronous tunneling construction of having solved, the synchronous implementation of shield tunneling and lining has been realized, construction efficiency has been improved, for similar major diameter single hole double line tunnel double layer lining inner structure construction provides the reference afterwards.
During concrete implementation, according to relevant standard requirements, the demolding period is determined according to the span size of the air duct plate 6, the span of the air duct plate 6 can be effectively reduced by integrally forming the intermediate wall 5 and the air duct plate 6, and demolding time can be effectively saved.
In this embodiment, the middle arc-shaped formwork 15-1 includes a middle arc-shaped formwork panel and a middle arc-shaped formwork stiffening rib mechanism arranged on the back of the middle arc-shaped formwork panel; the vertical template 15-2 comprises a vertical template panel and a vertical template stiffening rib mechanism arranged on the back surface of the vertical template panel; the horizontal template 15-3 comprises a horizontal template panel and a horizontal template stiffening rib mechanism arranged on the back surface of the horizontal template panel; template bending gaps are formed between the middle arc-shaped template stiffening rib mechanism and the horizontal template stiffening rib mechanism and between the vertical template stiffening rib mechanism and the horizontal template stiffening rib mechanism.
Step seven, constructing an inverted arch leveling plate and a vault secondary lining: and when the concrete strength of the constructed air duct plate 6 meets the design requirement, pouring concrete on the upper surfaces of the mouth piece box culvert 7 and the inverted arch filling layer 8 to construct an inverted arch leveling plate 4, and constructing the top secondary lining 3-3 on the air duct plate 6 by adopting a small template trolley on the upper part of the constructed air duct plate 6.
During actual use, the top secondary lining 3-3 and the inverted arch leveling plate 4 can be synchronously constructed, the two are not interfered with each other, and the construction efficiency can be effectively improved.
When concrete strength of the constructed air duct plate 6 meets design requirements, the inverted arch leveling plate and the vault secondary lining can be constructed, and the secondary lining between the middle partition wall, the air duct plate and the tunnel waist line which are not constructed at the rear of the tunnel and the air duct plate continues to be constructed backwards.
In the concrete implementation, the small shaping steel template system adopted in the fifth step comprises a bottom arc-shaped template 12 and a template support frame body 13 which are matched with the inner wall of the primary lining 1, wherein the template support frame body 13 comprises a plurality of right triangle supports 13-1 which are sequentially connected along the extending direction of a tunnel, a plurality of pushing oil cylinders 14 for pushing the bottom arc-shaped template 12 are sequentially arranged on the hypotenuse of each right triangle support 13-1 from top to bottom, one ends of the pushing oil cylinders 14 are hinged to the right triangle supports 13-1, and the other ends of the pushing oil cylinders 14 are hinged to the bottom arc-shaped template 12;
The right triangle supports 13-1 are parallel to each other, and two rollers 13-2 are arranged at the bottom of each right triangle support 13-1;
The included angles between the pushing cylinders 14 on the right triangle support 13-1 and the horizontal plane are gradually increased from top to bottom.
When in actual use, the shaping small steel template system is adopted to construct the bottom secondary lining 3-1, compared with the whole trolley structure, the structure is small, the operation of constructors is convenient, and the construction of the bottom secondary lining 3-1 can be ensured not to influence the tunnel shield tunneling construction.
In the specific implementation, in the step six, a first horizontal connecting section template for being connected with the horizontal template 15-3 is arranged at the upper end of the middle arc-shaped template 15-1, the first horizontal connecting section template and the middle arc-shaped template 15-1 are integrally formed, the first horizontal connecting section template is hinged on one side of the horizontal template 15-3, a second horizontal connecting section template for being connected with the horizontal template 15-3 is arranged at the upper end of the vertical template 15-2, the second horizontal connecting section template and the vertical template 15-2 are integrally formed, and the second horizontal connecting section template is hinged on the other side of the horizontal template 15-3;
The template supporting framework 17 is a cube frame body, the horizontal template 15-3 is arranged at the top of the template supporting framework 17 through two I-shaped steels, a pushing oil cylinder 14 for pushing the middle arc-shaped template 15-1 is arranged on one side of the template supporting framework 17, and a pushing oil cylinder 14 for pushing the vertical template 15-2 is arranged on the other side of the template supporting framework 17;
A plurality of adjusting screws 18 which play a supporting role are connected between the middle arc-shaped template 15-1 and the template supporting framework 17 and between the vertical template 15-2 and the template supporting framework 17.
When the middle partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 are in actual use, after construction, and demoulding is needed, one end of the adjusting screw 18 is disconnected from the assembled formwork, nuts on the counter screw 16 are detached, then the pushing cylinders 14 on two sides of the formwork support framework 17 are controlled to retract to drive the middle arc-shaped formwork 15-1 and the vertical formwork 15-2 to be recycled inwards, and demoulding of the middle arc-shaped formwork 15-1 and the vertical formwork 15-2 is completed.
When the assembled form is supported, one end of the adjusting screw 18 is disconnected from the assembled form, then the form is pushed in place by the pushing cylinder 14, and then all the adjusting screws 18 are connected with the assembled form, so that the adjusting screw 18 can play a certain supporting role on the assembled form in the concrete construction process of the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2, and the assembled form is prevented from being deformed or damaged due to overlarge stress of the pushing cylinder 14 in the concrete construction process of the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2; after the concrete strength of the middle partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 reaches the design strength, when demoulding, one end of the adjusting screw 18 is disconnected from the assembled formwork, and then the piston rod of the pushing cylinder 14 is controlled to retract.
In the sixth step, a jacking cylinder 19 is disposed at each corner of the bottom of the formwork support frame 17, the jacking cylinders 19 are disposed along the height direction of the formwork support frame 17, the cylinder body of each jacking cylinder 19 is fixed at one side of the formwork support frame 17, and a running mechanism 20 is disposed at the piston rod end of each jacking cylinder 19.
In actual use, by arranging the jacking oil cylinder 19, when the middle partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 are constructed, the horizontal template 15-3 can be jacked in place by controlling the extension of a piston rod of the jacking oil cylinder 19, so that the pouring construction of the air duct plate 6 is facilitated; when the middle partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 are required to be demoulded after construction is completed, firstly, the middle arc-shaped template 15-1 and the vertical template 15-2 are demoulded, and then the piston rod of the jacking cylinder 19 can be controlled to retract so that the horizontal template 15-3 is lowered to complete demould.
The travelling mechanism 20 comprises a travelling frame fixed on the piston rod end of the jacking cylinder 19 and two travelling wheels arranged on the travelling frame, and the inverted arch filling layers 8 on two sides of the box culvert 7 of the mouth piece are respectively provided with a guide rail for guiding the travelling wheels; the provision of the running gear 20 facilitates movement of the entire specialized template trolley.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A construction method of an isolated double-lining shield tunnel structure is characterized by comprising the following steps: this isolated double-lining shield tunnel structure is including setting up primary lining (1) in tunnel hole to and set up secondary lining (3) and inverted arch screed (4) in primary lining (1), primary lining (1) are including the multiple ring segment, inverted arch screed (4) set up between the both sides bottom of secondary lining (3), be provided with between primary lining (1) and secondary lining (3) and keep apart buffer layer (2), be provided with intermediate wall (5) on inverted arch screed (4), be provided with wind channel board (6) on intermediate wall (5), the bottom of inverted arch screed (4) is provided with opening sub-piece box culvert (7) and inverted arch filling layer (8), opening sub-piece box culvert (7) are including a plurality of prefabricated opening sub-pieces, the both sides bottom of isolating buffer layer (2) is provided with a collector pipe (9) respectively, a plurality of inlet openings have been seted up on collector pipe (9) along the extending direction of extension of collector pipe (9), opening sub-piece (7) are provided with between collector pipe (10);
the method comprises the following steps:
step one, constructing a primary lining and a mouth piece box culvert: in the process of tunneling a tunnel shield, assembling segments in a tunnel body from front to back to form a primary lining (1), and assembling prefabricated mouth pieces at the bottom of the tunnel body from front to back to form a mouth piece box culvert (7);
Step two, installing a water collecting pipe and a water drain pipe: when the construction length of the primary lining (1) reaches a set length, sequentially connecting a plurality of water collecting pipe segments through a tee joint along the extending direction of the tunnel at the bottom of the constructed primary lining (1) to form a water collecting pipe (9);
Wherein, each water collecting pipe section is provided, the outside of the water collecting pipe section is wrapped with a non-woven fabric permeable layer, each tee joint is provided with a water drain pipe (10), and one end of the water drain pipe (10) far away from the water collecting pipe (9) extends into a through hole reserved on the prefabricated mouth piece;
Step three, constructing an inverted arch filling layer: backfilling concrete poured from front to back on two sides of a box culvert (7) of an opening part at the position where the water collecting pipe section is installed every time the water collecting pipe section is installed, so as to form an inverted arch filling layer;
Fourthly, constructing an isolation buffer layer: when the concrete strength of the constructed inverted arch filling layer in the third step reaches the design strength, arranging an isolation buffer layer (2) on the surface of the primary lining (1) at the position corresponding to the inverted arch filling layer (8) with the concrete strength reaching the design strength;
Step five, constructing secondary lining below the tunnel waistline: the lower parts of the waist parts at the two sides of the constructed isolation buffer layer (2) are concreted by a small shaping steel template system from front to back to form a bottom secondary lining (3-1);
Step six, constructing secondary lining between the intermediate wall, the air duct plate and the tunnel waist line to the air duct plate: after the tunnel shield tunneling is completed, pouring construction is carried out at the designed positions of the middle partition wall (5), the air duct plate (6) and the middle secondary lining (3-2) from front to back by adopting a special template trolley, so as to form the middle partition wall (5), the air duct plate (6) and the middle secondary lining (3-2);
The special template trolley comprises two symmetrically arranged template trolley units, each template trolley unit comprises an assembled template and a template supporting framework (17) matched with the assembled template, the assembled template comprises a middle arc-shaped template (15-1) for forming a middle secondary lining (3-2), a vertical template (15-2) for forming an intermediate wall (5) and a horizontal template (15-3) for forming an air duct plate (6), a plurality of opposite-pulling screws (16) are connected between the two vertical templates (15-2), and gaps matched with the thickness of the intermediate wall (5) are formed between the two vertical templates (15-2);
step seven, constructing an inverted arch leveling plate and a vault secondary lining: when the concrete strength of the air duct plate (6) meets the design requirement, pouring concrete on the upper surfaces of the opening box culvert (7) and the inverted arch filling layer (8) to construct an inverted arch leveling plate (4), and constructing the top secondary lining (3-3) on the air duct plate (6) by adopting a small template trolley on the upper part of the constructed air duct plate (6);
The upper end of middle part arc template (15-1) is provided with a first horizontal linkage segment template that is used for being connected with horizontal template (15-3), first horizontal linkage segment template and middle part arc template (15-1) integrated into one piece, first horizontal linkage segment template articulates in one side of horizontal template (15-3), the upper end of vertical template (15-2) is provided with a second horizontal linkage segment template that is used for being connected with horizontal template (15-3), second horizontal linkage segment template and vertical template (15-2) integrated into one piece, second horizontal linkage segment template articulates in the opposite side of horizontal template (15-3).
2. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: two sides of the intermediate wall (5) are respectively provided with an evacuation platform (11), the two evacuation platforms (11) are symmetrically arranged at the bottoms of the two sides of the intermediate wall (5), and the evacuation platforms (11) are mutually perpendicular to the intermediate wall (5).
3. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: the two ends of the air duct plate (6) are respectively connected to the secondary lining (3) on two sides of the tunnel, the air duct plate (6) is perpendicular to the middle partition wall (5), and the middle partition wall (5) is perpendicular to the inverted arch leveling plate (4).
4. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: one end of the water drain pipe (10) is communicated with the water collecting pipe (9) through a three-way pipeline, and the other end of the water drain pipe (10) is communicated with the internal channel of the mouth piece box culvert (7) after being inclined downwards.
5. The construction method of the isolated double-lining shield tunnel structure according to claim 4, wherein the construction method comprises the following steps: the inverted arch leveling plate (4) is arranged along the extending direction of the tunnel, the lower surface of the inverted arch leveling plate (4) is arranged close to the upper surface of the opening sub-piece box culvert (7), and the included angle between the drain pipe (10) and the inverted arch leveling plate (4) is 10-15 degrees.
6. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: the water inlet holes on the water collecting pipe (9) are distributed in a multi-row staggered mode, and the non-woven fabric water permeable layer is wrapped outside the water collecting pipe (9).
7. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: the small shaping steel template system adopted in the fifth step comprises a bottom arc-shaped template (12) and a template support frame body (13) which are matched with the inner wall of the primary lining (1), the template support frame body (13) comprises a plurality of right triangle supports (13-1) which are sequentially connected along the extending direction of a tunnel, a plurality of pushing oil cylinders (14) for pushing the bottom arc-shaped template (12) are sequentially arranged on the hypotenuse of each right triangle support (13-1) from top to bottom, one ends of the pushing oil cylinders (14) are hinged to the right triangle supports (13-1), and the other ends of the pushing oil cylinders (14) are hinged to the bottom arc-shaped template (12);
The right-angle triangular supports (13-1) are parallel to each other, and two rollers (13-2) are arranged at the bottom of each right-angle triangular support (13-1);
The included angles between the pushing cylinders (14) on the right triangle support (13-1) and the horizontal plane are gradually increased from top to bottom.
8. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: in the sixth step, the template supporting framework (17) is a cube frame body, the horizontal template (15-3) is arranged at the top of the template supporting framework (17) through two I-shaped steels, a pushing oil cylinder (14) for pushing the middle arc-shaped template (15-1) is arranged on one side of the template supporting framework (17), and a pushing oil cylinder (14) for pushing the vertical template (15-2) is arranged on the other side of the template supporting framework (17);
A plurality of adjusting screws (18) with supporting function are connected between the middle arc-shaped template (15-1) and the template supporting framework (17) and between the vertical template (15-2) and the template supporting framework (17).
9. The construction method of the isolated double-lining shield tunnel structure according to claim 1, wherein the construction method comprises the following steps: in the sixth step, a jacking oil cylinder (19) is arranged at each corner of the bottom of the formwork support framework (17), the jacking oil cylinders (19) are distributed along the height direction of the formwork support framework (17), the cylinder bodies of the jacking oil cylinders (19) are fixed on one side of the formwork support framework (17), and a travelling mechanism (20) is arranged at the piston rod ends of each jacking oil cylinder (19).
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| CN114278341B (en) * | 2022-02-16 | 2024-02-27 | 中铁一局集团有限公司 | Two-lining template construction structure and method based on mine tunnel special-shaped section |
| CN116122823B (en) * | 2023-03-29 | 2023-08-15 | 山东鼎昌复合材料有限公司 | Tunnel evacuation channel construction device and method |
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