CN113803088A - 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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- CN113803088A CN113803088A CN202111135886.7A CN202111135886A CN113803088A CN 113803088 A CN113803088 A CN 113803088A CN 202111135886 A CN202111135886 A CN 202111135886A CN 113803088 A CN113803088 A CN 113803088A
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- 238000010276 construction Methods 0.000 title claims abstract description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 118
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000002955 isolation Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000005192 partition Methods 0.000 claims abstract description 14
- 238000009415 formwork Methods 0.000 claims description 40
- 230000005641 tunneling Effects 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 13
- 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
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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 isolation buffer layer and a secondary lining, the bottom parts of two sides of the isolation 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 box culvert of an opening part; the method comprises the steps of firstly, constructing a primary lining and a mouth piece box culvert; secondly, installing a water collecting pipe and a water drain pipe; thirdly, constructing an inverted arch filling layer; fourthly, constructing an isolation buffer layer; fifthly, constructing a secondary lining below the tunnel waist line; and sixthly, constructing a secondary lining between the intermediate wall, the air duct plate and the tunnel waist line to the air duct plate. The invention can effectively reduce the damage of the secondary lining structure caused by the leakage water of the primary lining, improves the construction efficiency, adopts the special template trolley to construct the same-step air duct plate and the mid-partition 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 form removal and short process cycle 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, the number of large shield tunnel projects in China is large, the construction scale is large, the construction technology difficulty is complex, and the development speed is high. Particularly, 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 in China, a composite lining mode of 'duct pieces and secondary lining' is tried to be used, and the concrete secondary lining is molded on the inner side of the shield duct pieces to form a composite lining structure together with the duct pieces, so that the durability of the tunnel structure is effectively improved.
The disadvantages and shortcomings of the lining are:
(1) leakage water occurs in the primary lining, and water is reserved between the inner circular arc and the duct piece for a long time and is easy to generate water pressure to influence a secondary lining structure;
(2) shield tunnel segments are connected by bolts, and the whole stress state is deviated from flexibility; the inner arc lining is cast in situ by a whole mould, so that the allowable deformation is relatively small, and the whole stress state is deviated from rigidity; the inner arc lining in the laminated structure form can influence the deformation of the duct piece to a certain extent, particularly under sudden change working conditions such as earthquake and the like;
(3) the shield synchronous construction has larger influence on the shield tunneling construction progress;
(4) according to the traditional construction process, a Pi-shaped template trolley is adopted to construct an air duct plate, and an intermediate wall is constructed after a tunnel is communicated, so that the construction cost is high and the total construction period is long due to the fact that the air duct plate span is too large and the concrete form removal strength is required to be 100% according to the relevant standard requirements.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an isolated double-lining shield tunnel construction structure aiming at the defects in the prior art, which has reasonable structural design and convenient and fast construction, effectively reduces the damage of a secondary lining structure caused by the leakage water of a primary lining, realizes the synchronous implementation of shield tunneling and lining, improves the construction efficiency, and provides reference for the construction of a double-layer lining internal 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 the synchronous construction operation of the residual structure under the condition of not influencing material transportation, and has the advantages of quick movement, quick assembly, quick positioning, quick form removal, short process cycle time and the like.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides an isolated double lining shield tunnel construction structure which characterized in that: including setting up first lining cutting in tunnel cave and setting secondary lining cutting and the invert screed-plate in first lining cutting, first lining cutting includes the multiple ring section of jurisdiction, the invert screed-plate sets up between secondary lining cutting's both sides bottom, be provided with the isolation buffer layer between first lining cutting and the secondary lining cutting, be provided with the mid-partition wall on the invert screed-plate, be provided with the wind channel board on the mid-partition wall, the bottom of invert screed-plate is provided with mouth piece box culvert and invert filling layer, mouth piece box culvert includes a plurality of prefabricated mouth pieces, the both sides bottom of isolating the buffer layer respectively is provided with a collector pipe, a plurality of inlet openings have been seted up on the collector pipe, the collector pipe is laid along the extending direction in tunnel, be provided with a plurality of wash-out pipes between collector pipe and the mouth piece box culvert.
Foretell two lining cutting shield tunnel construction structures of isolated, its characterized in that: the two sides of the middle partition wall are respectively provided with an evacuation platform, the two evacuation platforms are symmetrically arranged at the bottoms of the two sides of the middle partition wall, and the evacuation platforms are perpendicular to the middle partition wall.
Foretell two lining cutting shield tunnel construction structures of isolated, its characterized in that: the two ends of the air duct plate are respectively connected to the secondary linings on the two sides of the tunnel, the air duct plate is perpendicular to the intermediate wall, and the intermediate wall is perpendicular to the inverted arch leveling plate.
Foretell two lining cutting shield tunnel construction structures of isolated, 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 downward inclined and then communicated with an internal channel of the mouth piece box culvert.
Foretell two lining cutting shield tunnel construction structures of isolated, its characterized in that: the inverted arch leveling plate is arranged along the extending direction of the tunnel, the lower surface of the inverted arch leveling plate is arranged to be closely attached to the upper surface of the box culvert of the opening part, and the included angle between the water drain pipe and the inverted arch leveling plate is 10-15 degrees.
Foretell two lining cutting shield tunnel construction structures of isolated, its characterized in that: a plurality of inlet openings on the collector pipe are the crisscross laying of multirow, the outside parcel of collector pipe has the non-woven fabrics permeable bed.
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 box culvert of a mouth piece: in the process of tunneling a tunnel shield, assembling segments in a tunnel body from front to back to form a primary lining, and simultaneously assembling prefabricated opening pieces at the bottom of the tunnel body from front to back to form an opening 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 sections at the bottom of the constructed primary lining along the extension direction of the tunnel through a tee joint to form a water collecting pipe;
wherein, when one water collecting pipe segment is installed, a non-woven fabric permeable layer is wrapped on the outer side of the water collecting pipe segment, when one tee joint is installed, a water drain pipe is installed on the tee joint, and one end of the water drain pipe, which is far away from the water collecting pipe, extends into a through hole reserved on the prefabricated opening part;
step three, constructing an inverted arch filling layer: when the installation of one water collecting pipe segment is finished, concrete is poured from front to back on two sides of the box culvert of the opening part at the position where the water collecting pipe segment is installed, and then a section of inverted arch filling layer is formed;
step four, 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 with the concrete strength reaching the design strength;
step five, constructing a secondary lining below the tunnel waist line: pouring concrete on the parts below the waist parts at two sides of the constructed isolation buffer layer from front to back by adopting a small sizing steel template system to form a bottom secondary lining;
step six, constructing a 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 finished, pouring construction is carried out on the design positions of the intermediate wall, the air duct plate and the middle secondary lining from front to back by adopting a special template trolley, so that the intermediate wall, the air duct plate and the middle secondary lining are formed;
the special template trolley comprises two template trolley units which are symmetrically arranged, each template trolley unit comprises an assembled template and a template supporting framework matched with the assembled template, each 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 counter-pulling 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;
seventhly, constructing an inverted arch leveling plate and arch crown secondary lining: after the concrete strength of the air duct plate reaches the design requirement, concrete is poured on the upper surfaces of the box culvert of the opening part and the inverted arch filling layer to construct an inverted arch leveling plate, and meanwhile, a small-sized template trolley is adopted on the upper portion of the constructed air duct plate to construct a top secondary lining on the air duct plate.
The construction method is characterized in that: the small sizing steel template system adopted in the fifth step comprises a bottom arc template and a template support frame body which are matched with the inner wall of the primary lining, the template support frame body comprises a plurality of right-angled triangle supports which are sequentially connected along the extending direction of the tunnel, a plurality of pushing oil cylinders for pushing the bottom arc template are sequentially mounted on the bevel edge of each right-angled triangle support from top to bottom, one end of each pushing oil cylinder is hinged to the corresponding right-angled triangle support, and the other end of each pushing oil cylinder is hinged to the bottom arc template;
the right-angled triangular supports are parallel to each other, and two rollers are arranged at the bottom of each right-angled triangular support;
and included angles between the plurality of pushing oil cylinders on the right-angled 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 used for being connected 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 used for being connected 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 formwork support framework is a cubic framework, the horizontal formwork is arranged at the top of the formwork support framework through two I-shaped steel bars, one side of the formwork support framework is provided with a pushing oil cylinder for pushing the middle arc-shaped formwork, and the other side of the formwork support framework is provided with a pushing oil cylinder for pushing the vertical formwork;
a plurality of adjusting screw rods for supporting 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: and sixthly, each corner at the bottom of the template supporting framework is provided with a jacking oil cylinder, the jacking oil cylinders are arranged along the height direction of the template supporting framework, a cylinder body of each jacking oil cylinder is fixed on one side of the template supporting framework, and a piston rod end of each jacking oil cylinder is provided with a travelling mechanism.
Compared with the prior art, the invention has the following advantages:
1. according to the isolation type double-lining shield tunnel construction structure, the isolation buffer layer is arranged between the primary lining and the secondary lining, the isolation buffer layer plays a role in buffering and isolating between the primary lining and the secondary lining, the secondary lining and the primary lining are prevented from being combined into a whole to bear surrounding rock pressure together, and further the acting force of the primary lining is prevented from being directly transmitted to the secondary lining to cause the destructive power of the structure.
2. According to the isolated double-lining shield tunnel construction structure adopted by the invention, the water collecting pipes are respectively arranged at the bottom parts of the two sides of the isolation buffer layer, and the plurality of water drain pipes are connected between the water collecting pipes and the box culvert of the opening part, so that accumulated water between the primary lining and the secondary lining can be collected through the water collecting pipes and is discharged into the box culvert of the opening part through the water drain pipes, and the damage of the secondary lining structure caused by the leakage water of the primary lining is effectively reduced.
3. The method adopted by the invention comprises the steps of constructing the secondary lining by dividing the secondary lining into a bottom secondary lining, a middle secondary lining and a top secondary lining, and constructing the intermediate wall, the air duct plate and the middle secondary lining after the whole tunnel is integrally communicated, thereby effectively solving the problem of mutual cross interference influence of shield tunneling and lining construction in shield synchronous tunneling construction, realizing synchronous implementation of shield tunneling and lining, improving construction efficiency and providing reference for the construction of a double-layer lining internal structure of a similar large-diameter single-hole double-line tunnel.
4. The method adopted by the invention can realize the synchronous construction operation of the middle secondary lining structure between the intermediate wall, the air duct plate and the tunnel waist line to the air duct plate without influencing material transportation by adopting the special template trolley, and has the advantages of quick movement, quick assembly, quick positioning, quick form removal, short process cycle time, reliable structure, convenient operation, good tunnel forming surface and the like.
In conclusion, the invention has reasonable structural design and convenient and fast construction, effectively reduces the damage of the secondary lining structure caused by the leakage water of the primary lining, realizes the synchronous implementation of shield tunneling and lining, improves the construction efficiency and provides reference for the construction of the internal structure of the double-layer lining of the 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 the synchronous construction operation of the residual structure under the condition of not influencing material transportation, and has the advantages of quick movement, quick assembly, quick positioning, quick form removal, short process cycle time and the like.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a sectional view of an isolated double-lining shield tunnel construction structure of the present invention.
FIG. 2 is a schematic structural diagram of a small sizing steel template system of the present invention.
Fig. 3 is a schematic structural view of the special template trolley of the invention.
FIG. 4 is a block flow diagram of the method of the present invention.
Description of reference numerals:
1, primary lining; 2-isolating buffer layer; 3, secondary lining;
3-1-secondary lining of the bottom; 3-2-middle secondary lining; 3-top secondary lining;
4-an inverted arch leveling plate; 5-an intermediate wall; 6-air duct board;
7-opening a box culvert; 8-an inverted arch filling layer; 9-a water collecting pipe;
10-a water drain pipe; 11-evacuation platform; 12-bottom arc form;
13-formwork support frame body; 13-1-right triangle support; 13-2-rollers;
14-pushing oil cylinder; 15-1-middle arc template; 15-2-vertical form;
15-3-horizontal template; 16-a counter-pulling screw; 17-a template support framework;
18-adjusting screw; 19-jacking oil cylinder; and 20, a traveling mechanism.
Detailed Description
An isolated double-lining shield tunnel construction structure as shown in fig. 1 comprises a primary lining 1 arranged in a tunnel body, and a secondary lining 3 and an inverted arch leveling plate 4 arranged in the primary lining 1, wherein the primary lining 1 comprises a plurality of ring segments, the inverted arch leveling plate 4 is arranged between the bottoms of two sides of the secondary lining 3, an isolation buffer layer 2 is arranged between the primary lining 1 and the secondary lining 3, a middle partition wall 5 is arranged on the inverted arch leveling plate 4, a wind channel plate 6 is arranged on the middle partition wall 5, a mouth piece box culvert 7 and an inverted arch filling layer 8 are arranged at the bottom of the inverted arch leveling plate 4, the mouth piece box culvert 7 comprises a plurality of prefabricated mouth piece parts, a water collecting pipe 9 is respectively arranged at the bottom of two sides of the isolation buffer layer 2, a plurality of water inlet holes are formed on the water collecting pipe 9, the water collecting pipe 9 is arranged along the extending direction of the tunnel, a plurality of drain pipes 10 are arranged between the water collecting pipe 9 and the mouth piece box culvert 7, and the drain pipes 10 are perpendicular to the water collecting pipe 9.
During the in-service use, keep apart buffer layer 2 for the panel that has certain compression capacity that thickness is 2cm thick, the section of jurisdiction of first lining 1 uses the bolt to link to belong to flexible stress structure, and secondary lining 3 is cast-in-place integral structure and is thought the rigid structure more, through be provided with between first lining 1 and secondary lining 3 and keep apart buffer layer 2, keep apart buffer layer 2 and play the buffering between first lining 1 and secondary lining 3, the effect of isolation, avoid secondary lining 3 to combine into a whole to undertake the country rock pressure jointly with first lining 1, and then avoid the effort of first lining 1 to directly transmit the destructive power that secondary lining 3 caused the structure.
It should be noted that, the long-term operation vibration and the stratum change of the subway may cause the segment joint of the primary lining 1 to open, dislocate, etc. and deform too much to cause a certain amount of water leakage, if the leakage occurs, there will be a certain water pressure to act on the secondary lining 3, and the bearing capacity of the secondary lining 3 is smaller and may deform too much and destabilize under the action of larger water pressure, which affects the structural durability, therefore, there is a water collecting pipe 9 respectively arranged at the bottom of both sides of the isolation buffer layer 2, can collect the ponding between the primary lining 1 and the secondary lining 3 through the water collecting pipe 9, effectively reduce the damage of the secondary lining 3 structure caused by the water leakage of the primary lining 1.
Specially, through connecting a plurality of wash-out pipes 10 between collector pipe 9 and mouth piece box culvert 7, can effectively discharge ponding in the collector pipe 9 to mouth piece box culvert 7 in, and then through mouth piece box culvert 7 discharge tunnel, can effectively guarantee drainage efficiency.
In specific implementation, the inverted arch leveling plate 4 is divided into a left section and a right section by the intermediate wall 5, and the bottom of the intermediate wall 5 is directly attached to the top of the box culvert 7 of the opening part.
In this embodiment, two evacuation platforms 11 are respectively disposed on two sides of the intermediate wall 5, the two evacuation platforms 11 are symmetrically disposed at the bottoms of two sides of the intermediate wall 5, and the evacuation platforms 11 are perpendicular to the intermediate wall 5.
In practical use, the evacuation platform 11 is arranged on the intermediate wall 5, 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 that of the air duct plate 6 on one side of the intermediate wall 5.
In this embodiment, the two ends of the air duct plate 6 are respectively connected to the secondary linings 3 on the two sides of the tunnel, the air duct plate 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 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 inclined downwards and then communicated with the internal channel of the box culvert 7 of the oral component.
During the in-service use, through making the other end downward sloping of outlet pipe 10 and link up mutually with the inside passage of mouth sub-piece box culvert 7, be convenient for ponding in the collector pipe 9 quick through outlet pipe 10 row in mouth sub-piece box culvert 7, and then avoid leading to ponding between first lining 1 and secondary lining 3 because of being full of water in the collector pipe 9.
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 in close contact with the upper surface of the mouth piece box culvert 7, and the included angle between the drain pipe 10 and the inverted arch leveling plate 4 is 10-15 °.
In this embodiment, a plurality of inlet openings on the collector pipe 9 are the crisscross laying of multirow, the outside parcel of collector pipe 9 has the non-woven fabrics permeable bed.
During the in-service use, through set up a plurality of inlet openings on collector pipe 9, be convenient for between first lining cutting 1 and the secondary lining cutting 3 ponding enter into in collector pipe 9 through the inlet opening.
During specific implementation, there is the non-woven fabrics permeable bed through the outside parcel at collector pipe 9, can separate collector pipe 9 and secondary lining 3 and invert filling layer 8, and then be convenient for first lining 1 and secondary lining 3 between ponding get into in the collector pipe 9.
A construction method of an isolated double-lined shield tunnel structure as shown in fig. 2 to 4, the method comprising the steps of:
step one, constructing a primary lining and a box culvert of a mouth piece: assembling duct pieces in a tunnel body and assembling prefabricated opening pieces synchronously from front to back while the tunnel shield is tunneled until the construction of a primary lining 1 and a box culvert 7 of the opening pieces is completed;
in actual use, the primary lining 1 plays a main supporting role, so that the internal structure of the tunnel is not influenced by surrounding rocks, the segment of the primary lining 1 is assembled in a staggered joint mode, the segment assembly adopts a top-down principle, a bottom standard block or an adjacent block is firstly installed from the lower part, the rest standard block and the rest adjacent block are symmetrically installed, and finally a capping block is installed; when the duct piece is assembled, the annular water stop strips are longitudinally compressed, then the longitudinal water stop strips are circumferentially compressed, and fine adjustment is carried out to align the bolt holes; screwing longitudinal and circumferential connecting bolts while assembling the duct pieces; and after the whole ring of pipe pieces are separated from the shield tail, screwing all the connecting bolts again according to the regulations.
It should be noted that the mouth piece box culvert 7 includes a plurality of prefabricated mouth pieces which are connected in sequence along the tunnel extending direction, and the mouth piece box culvert 7 mainly functions to ensure that shield construction vehicles such as rubber-tyred transport vehicles, forklifts, mortar tankers and the like have flat transport channels, and is used as a channel for tunnel pipelines, cable laying and leakage water collection in the later period. The mouth piece box culvert 7 is a concrete prefabricated component, the assembling construction of the prefabricated mouth piece is also synchronously carried out with the shield tunneling construction, and the box culvert piece culvert 7 is moved and assembled by a box culvert piece crane in the connecting bridge area of the shield tunneling 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 sections at the bottom of the constructed primary lining 1 along the extension direction of the tunnel through a tee joint to form a water collecting pipe 9;
wherein, when one water collecting pipe segment is installed, a non-woven fabric permeable layer is wrapped on the outer side of the water collecting pipe segment, when one tee joint is installed, a water drain pipe 10 is installed on the tee joint, 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 opening part;
during actual use, the water collecting pipe 9 is formed by connecting a plurality of water collecting pipe sections through a tee joint, a water drain pipe 10 is arranged between every two adjacent water collecting pipe sections, when the water collecting pipe 9 and the water drain pipe 10 are constructed, firstly, one water collecting pipe section is respectively installed at the bottom of each of two sides of the primary lining 1, then, one water drain pipe 10 is connected to the rear end of each water collecting pipe section through the tee joint, one end of the water drain pipe 10 is installed in a through hole reserved on the prefabricated opening sub-piece, then, one water collecting pipe section is respectively installed on each of the two tee joints, then, the water drain pipe 10 is installed, and the method is repeated until the whole water collecting pipe 9 and the plurality of water drain pipes 10 are installed.
During the actual use, the collector pipe 9 and the water drain pipe 10 all adopt HDPE double-walled bellows, and the main effect is in gathering the drainage between primary lining 1 and secondary lining 3 to the mouth sub-piece box culvert 7 in, drive the ponding between primary lining 1 and secondary lining 3, effectively reduce because of the damage that primary lining 1 seepage caused secondary lining 3 structure.
It should be noted that, wrapping the non-woven fabric permeable layer on the outer side of the water collecting pipe 9 first avoids that the water inlet of the water collecting pipe 9 is blocked by the poured concrete when the inverted arch filling layer 8 is constructed, and the water collecting pipe 9 loses the functions of water collection and drainage.
It should be noted that, 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 the shield tunneling, and the construction of the water collecting pipe 9 and the water drain pipe 10 and the construction of the primary lining 1 and the mouth piece box culvert 7 do not interfere with each other.
Step three, constructing an inverted arch filling layer: when the installation of one water collecting pipe segment is finished, concrete is poured from front to back on two sides of the box culvert 7 of the opening part at the position where the water collecting pipe segment is installed, and then a section of inverted arch filling layer is formed;
during the in-service use, the mouth piece box culvert 7 top region is narrow and small, can not the wrong car, and 7 both sides of mouth piece box culvert face sky and have the potential safety hazard, and the main function of 7 both sides backfillings of mouth piece box culvert ensures that shield construction vehicles such as rubber tyer transport vechicle, fork truck, mortar tank car have flat, safe transport passage, makes things convenient for the wrong car.
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 without interfering with the construction of the water collecting pipe 9 and the water drain pipe 10, and the water collecting pipe 9 and the water drain pipe 10 are secured at the construction position of the inverted arch filling layer 8 when the inverted arch filling layer 8 is constructed.
Step four, constructing an isolation buffer layer: when the concrete strength of the inverted arch filling layer constructed in the third step reaches the design strength, bonding a plate with a 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 in time to form an isolation buffer layer 2;
during the in-service use, before carrying out the construction of isolation buffer layer 2, at first handle the section of jurisdiction structure surface of primary lining 1, if there is open water or seepage on the structure surface, handle the seepage water earlier.
It should be noted that 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 a secondary lining below the tunnel waist line: pouring concrete into the parts below the waist parts on two sides of the constructed isolation buffer layer 2 from front to back by adopting a small sizing steel formwork system to form a bottom secondary lining 3-1;
in practical 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.
It should be noted that, the processes in the first step to the fifth step do not interfere with each other, and the single process in the tunnel can be stopped after the whole construction is completed, and is not affected by other processes.
In specific implementation, after the tunneling of the tunnel shield is finished, namely the whole tunnel is integrally communicated, no matter whether the processes from the step one to the step five are finished, the construction of the secondary lining between the intermediate wall and the air duct plate in the step six and between the tunnel waist line and the air duct plate can be carried out, and the processes from the step one to the step six do not interfere with each other.
Step six, constructing a 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 finished, namely the whole tunnel is integrally communicated, pouring construction is carried out on 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 by adopting a special template trolley;
the special template trolley comprises two template trolley units which are symmetrically arranged, 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 the intermediate wall 5 and a horizontal template 15-3 for forming the air duct plate 6, a plurality of counter-pulling screw rods 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 the in-service use, special template platform truck structural design is simple, convenient operation, and the construction precision is high, can realize the synchronous construction operation of middle part secondary lining 3-2 structure between mid-board 5, wind channel board 6 and the tunnel stringcourse to the wind channel board under the circumstances that does not influence material transport, has that the removal is fast, assemble fast, the location is fast, the form removal is fast, process cycle time is short, the structure is reliable, convenient operation, tunnel profile of compact advantage such as good.
It should be noted that the construction of the secondary lining 3 is divided into a bottom secondary lining 3-1, a middle secondary lining 3-2 and a top secondary lining 3-3, and the construction of the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2 is performed only after the whole tunnel is integrally communicated, so that the problem of the mutual cross interference influence of shield tunneling and lining construction in shield synchronous tunneling construction is effectively solved, the synchronous implementation of shield tunneling and lining is realized, the construction efficiency is improved, and a reference is provided for the construction of a double-layer lining internal structure of a similar large-diameter single-hole double-line tunnel.
When the concrete implementation, according to relevant standard requirement, the span size decision drawing of patterns cycle of wind channel board 6, through with mid-board 5 and 6 integrated into one piece of wind channel board, can effectively reduce the span of wind channel board 6, and then can effectively practice thrift the drawing of patterns time, through adopting special template platform truck construction, can realize the synchronous construction operation of surplus structure under the condition that does not influence the material transportation, it is fast to have the removal, assemble fast, the location is fast, the form removal is fast, process cycle time is short, the structure is reliable, high durability and convenient operation, tunnel profile of compact advantage such as good.
In this embodiment, the middle arc formwork 15-1 comprises a middle arc formwork panel and a middle arc formwork stiffening rib mechanism arranged on the back of the middle arc formwork panel; the vertical template 15-2 comprises a vertical template panel and a vertical template stiffening rib mechanism arranged on the back 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 of the horizontal template panel; template bending gaps are arranged 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.
Seventhly, constructing an inverted arch leveling plate and arch crown secondary lining: and after the concrete strength of the constructed air duct plate 6 reaches 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 a top secondary lining 3-3 on the air duct plate 6 by adopting a small-sized 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 constructed synchronously without mutual interference, and the construction efficiency can be effectively improved.
During specific implementation, after the concrete strength of the constructed air duct plate 6 reaches the design requirement, an inverted arch leveling plate and an arch crown secondary lining can be constructed, and the secondary lining between the un-constructed middle partition wall and the air duct plate at the rear of the tunnel and between the waist line of the tunnel and the air duct plate continues to be constructed backwards.
During specific implementation, the small sizing steel template system adopted in the fifth step comprises a bottom arc template 12 and a template supporting frame body 13 which are matched with the inner wall of the primary lining 1, the template supporting frame body 13 comprises a plurality of right-angled triangle supports 13-1 which are sequentially connected along the extending direction of the tunnel, a plurality of pushing cylinders 14 for pushing the bottom arc template 12 are sequentially arranged on the bevel edge of each right-angled triangle support 13-1 from top to bottom, one end of each pushing cylinder 14 is hinged on the right-angled triangle support 13-1, and the other end of each pushing cylinder 14 is hinged with the bottom arc template 12;
the right-angled triangular supports 13-1 are parallel to each other, and two rollers 13-2 are arranged at the bottom of each right-angled triangular support 13-1;
the included angles between the plurality of pushing oil cylinders 14 on the right-angled triangle support 13-1 and the horizontal plane are gradually increased from top to bottom.
During actual use, when the small sizing steel formwork system is adopted for construction of the bottom secondary lining 3-1, compared with the whole trolley structure, the structure is small, operation of constructors is convenient, and the fact that construction of the bottom secondary lining 3-1 does not affect tunnel shield tunneling construction can be guaranteed.
In the sixth step, a first horizontal connecting section template used 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 to one side of the horizontal template 15-3, a second horizontal connecting section template used 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 to the other side of the horizontal template 15-3;
the formwork support framework 17 is a cubic frame body, the horizontal formwork 15-3 is arranged at the top of the formwork support framework 17 through two I-shaped steel, one side of the formwork support framework 17 is provided with a pushing oil cylinder 14 for pushing the middle arc-shaped formwork 15-1, and the other side of the formwork support framework 17 is provided with a pushing oil cylinder 14 for pushing the vertical formwork 15-2;
and a plurality of adjusting screws 18 for supporting 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.
In practical use, when demoulding is needed after the construction of the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2 is completed, one end of the adjusting screw 18 is disconnected from the assembled template, the nut on the counter-pull screw 16 is disassembled, and then the pushing cylinders 14 on two sides of the template supporting framework 17 are controlled to retract to drive the middle arc template 15-1 and the vertical template 15-2 to be retracted inwards, so that demoulding of the middle arc template 15-1 and the vertical template 15-2 is completed.
It should be noted that, when the fabricated formwork is erected, one end of the adjusting screw 18 is disconnected from the fabricated formwork, then the formwork is pushed in place by the pushing cylinder 14, and then all the adjusting screw 18 are connected with the fabricated formwork, so that the adjusting screw 18 can play a certain supporting role on the fabricated formwork in the concrete construction process of the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2, and the fabricated formwork is prevented from being deformed or damaged due to excessive 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 intermediate partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 reaches the design strength, when demoulding is carried out, one end of the adjusting screw 18 is disconnected with the assembled template, and then the retraction of a piston rod of the jacking oil cylinder 14 is controlled.
In the sixth step, each corner at the bottom of the formwork support framework 17 is provided with a jacking cylinder 19, the jacking cylinders 19 are arranged along the height direction of the formwork support framework 17, the cylinder body of each jacking cylinder 19 is fixed on one side of the formwork support framework 17, and the piston rod end of each jacking cylinder 19 is provided with a traveling mechanism 20.
When the horizontal formwork is actually used, the jacking oil cylinder 19 is arranged, and when the intermediate wall 5, the air duct plate 6 and the middle secondary lining 3-2 are constructed, the horizontal formwork 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 demoulding is needed after the construction of the intermediate partition wall 5, the air duct plate 6 and the middle secondary lining 3-2 is completed, firstly demoulding is carried out on the middle arc-shaped template 15-1 and the vertical template 15-2, and then the piston rod of the jacking oil cylinder 19 can be controlled to retract so as to lower the horizontal template 15-3 to complete demoulding.
It should be noted that the traveling mechanism 20 includes a traveling frame fixed at the end of the piston rod of the jacking cylinder 19 and two traveling wheels installed on the traveling frame, and the inverted arch filling layers 8 on both sides of the mouth piece box culvert 7 are respectively provided with a guide rail for guiding the traveling wheels; the running mechanism 20 is arranged to facilitate the movement of the whole special template trolley.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an isolated double lining shield tunnel construction structure which characterized in that: including setting up in the internal first lining cutting (1) of tunnel cave and setting up secondary lining cutting (3) and invert screed-plate (4) in first lining cutting (1), first lining cutting (1) includes the multiple ring section of jurisdiction, invert screed-plate (4) set up between the both sides bottom of secondary lining cutting (3), be provided with between first lining cutting (1) and secondary lining cutting (3) and keep apart buffer layer (2), be provided with mid-board (5) on invert screed-plate (4), be provided with wind channel plate (6) on mid-board (5), the bottom of invert screed-plate (4) is provided with mouth spare box culvert (7) and invert filling layer (8), mouth spare box culvert (7) includes a plurality of prefabricated mouth spares, the both sides bottom of keeping apart buffer layer (2) does not are provided with one collector pipe (9), a plurality of inlet openings have been seted up on collector pipe (9), the water collecting pipes (9) are arranged along the extending direction of the tunnel, and a plurality of water drain pipes (10) are arranged between the water collecting pipes (9) and the opening piece box culvert (7).
2. The isolated double-lining shield tunnel construction structure according to claim 1, characterized in that: the two sides of the intermediate wall (5) are respectively provided with an evacuation platform (11), the evacuation platforms (11) are symmetrically arranged at the bottoms of the two sides of the intermediate wall (5), and the evacuation platforms (11) are perpendicular to the intermediate wall (5).
3. The isolated double-lining shield tunnel construction structure according to claim 1, characterized in that: the two ends of the air duct plate (6) are respectively connected to the secondary linings (3) on the two sides of the tunnel, the air duct plate (6) is perpendicular to the intermediate wall (5), and the intermediate wall (5) is perpendicular to the inverted arch leveling plate (4).
4. The isolated double-lining shield tunnel construction structure according to claim 1, characterized in that: 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) inclines downwards and then is communicated with an internal channel of the mouth piece box culvert (7).
5. The isolated double-lining shield tunnel construction structure according to claim 4, wherein: 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 to be closely attached to the upper surface of the mouth piece box culvert (7), and the included angle between the water drain pipe (10) and the inverted arch leveling plate (4) is 10-15 degrees.
6. The isolated double-lining shield tunnel construction structure according to claim 1, characterized in that: a plurality of inlet openings on the water collecting pipe (9) are arranged in a multi-row staggered mode, and the outer portion of the water collecting pipe (9) is wrapped with a non-woven fabric permeable layer.
7. A construction method of an isolated double-lining shield tunnel structure is characterized by comprising the following steps:
step one, constructing a primary lining and a box culvert of a mouth piece: in the tunneling process of the tunnel shield, the assembling of the duct pieces in the tunnel body is synchronously carried out from front to back to form a primary lining (1), and meanwhile, the assembling of prefabricated opening parts at the bottom of the tunnel body is synchronously carried out from front to back to form an opening part box culvert (7);
step two, installing a water collecting pipe and a water drain pipe: after the construction length of the primary lining (1) reaches a set length, sequentially connecting a plurality of water collecting pipe sections at the bottom of the constructed primary lining (1) along the extending direction of the tunnel through a tee joint to form a water collecting pipe (9);
wherein, when one water collecting pipe segment is installed, a non-woven fabric permeable layer is wrapped on the outer side of the water collecting pipe segment, when one tee joint is installed, a water drain pipe (10) is installed on the tee joint, 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 opening part;
step three, constructing an inverted arch filling layer: when the installation of one water collecting pipe segment is finished, concrete is poured from front to back on two sides of the box culvert (7) of the opening part at the position where the water collecting pipe segment is installed, and then a section of inverted arch filling layer is formed;
step four, 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 a secondary lining below the tunnel waist line: pouring concrete into the parts below the waist parts on two sides of the constructed isolation buffer layer (2) from front to back by adopting a small sizing steel formwork system to form a bottom secondary lining (3-1);
step six, constructing a 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 finished, pouring construction is carried out on the design 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 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 template trolley units which are symmetrically arranged, 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) used for forming a middle secondary lining (3-2), a vertical template (15-2) used for forming an intermediate wall (5) and a horizontal template (15-3) used for forming an air duct plate (6), a plurality of counter-pulling screw rods (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);
seventhly, constructing an inverted arch leveling plate and arch crown secondary lining: after the concrete strength of the air duct plate (6) reaches the design requirement, concrete is poured on the upper surfaces of the opening piece box culvert (7) and the inverted arch filling layer (8) to construct the inverted arch leveling plate (4), and meanwhile, a small-sized template trolley is adopted on the upper portion of the constructed air duct plate (6) to construct the top secondary lining (3-3) on the air duct plate (6).
8. The construction method according to claim 7, wherein: the sizing small steel template system adopted in the fifth step comprises a bottom arc template (12) matched with the inner wall of the primary lining (1) and a template supporting frame body (13), wherein the template supporting frame body (13) comprises a plurality of right-angled triangle supports (13-1) which are sequentially connected along the extending direction of the tunnel, a plurality of pushing cylinders (14) used for pushing the bottom arc template (12) are sequentially arranged on the bevel edge of each right-angled triangle support (13-1) from top to bottom, one end of each pushing cylinder (14) is hinged to the corresponding right-angled triangle support (13-1), and the other end of each pushing cylinder (14) is hinged to the bottom arc template (12);
the right-angled triangular supports (13-1) are parallel to each other, and the bottom of each right-angled triangular support (13-1) is provided with two rollers (13-2);
the included angles between the plurality of pushing oil cylinders (14) on the right-angled triangle support (13-1) and the horizontal plane are gradually increased from top to bottom.
9. The construction method according to claim 7, wherein: in the sixth step, a first horizontal connecting section template used 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 to one side of the horizontal template (15-3), a second horizontal connecting section template used 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 to the other side of the horizontal template (15-3);
the formwork supporting framework (17) is a cubic frame body, the horizontal formwork (15-3) is arranged at the top of the formwork supporting framework (17) through two I-shaped steel, one side of the formwork supporting framework (17) is provided with a pushing oil cylinder (14) used for pushing the middle arc-shaped formwork (15-1), and the other side of the formwork supporting framework (17) is provided with a pushing oil cylinder (14) used for pushing the vertical formwork (15-2);
a plurality of adjusting screw rods (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).
10. The construction method according to claim 7, wherein: and sixthly, each corner at the bottom of the template supporting framework (17) is provided with a jacking oil cylinder (19), the jacking oil cylinders (19) are distributed along the height direction of the template supporting framework (17), the cylinder body of each jacking oil cylinder (19) is fixed on one side of the template supporting framework (17), and the piston rod end of each jacking oil cylinder (19) is provided with a travelling mechanism (20).
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| CN114278341A (en) * | 2022-02-16 | 2022-04-05 | 中铁一局集团有限公司 | Two-lining template construction structure and method based on mine method tunnel special-shaped section |
| CN116122823A (en) * | 2023-03-29 | 2023-05-16 | 山东鼎昌复合材料有限公司 | Tunnel evacuation channel construction device and method |
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