CN113309541B - Lining construction method for shield small-radius tunnel - Google Patents
Lining construction method for shield small-radius tunnel Download PDFInfo
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- CN113309541B CN113309541B CN202110647443.XA CN202110647443A CN113309541B CN 113309541 B CN113309541 B CN 113309541B CN 202110647443 A CN202110647443 A CN 202110647443A CN 113309541 B CN113309541 B CN 113309541B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
Abstract
The invention provides a shield small-radius tunnel lining construction method, which belongs to the technical field of shield construction and comprises S1, a needle beam front support and a needle beam rear support are extended, so that the needle beam supports rotate a deflection frame and a template system; s2, determining the template form of the needle beam type rotary die full-circle lining trolley according to the tunnel form; s3, longitudinally positioning the needle beam type rotary die full-circle lining trolley; s4, positioning the center line of the needle beam type rotary die full-circle lining trolley; s5, positioning the elevation of the needle beam type rotary die full-circle lining trolley; s6, unfolding the panel; s7, placing a balance weight to enable the gravity center of the needle beam type rotary die full-circle lining trolley to move downwards; s8, end sealing of the head die, water stop belt installation and concrete pouring; s9, moving the needle beam forwards and positioning; s10, demolding; s11, next cycle. The invention can be converted between the straight section and the curved section of the tunnel without reducing the length of once cast concrete and installing and dismantling a wedge-shaped template.
Description
Technical Field
The invention belongs to the technical field of shield construction, and particularly discloses a shield small-radius tunnel lining construction method.
Background
In recent years, along with city expansion, diversion and water delivery tunnels are gradually increased, compared with urban subway shield tunnels, the diversion and water delivery shield tunnels have small sections and small turning radii, and secondary lining concrete needs to be poured on the basis of shield segments.
The diversion and water delivery shield tunnel is circular in shape, and a circular needle beam type lining trolley is needed to be adopted for lining construction, so that the integrity of lining concrete can be ensured. The longitudinal axis of the existing needle beam type lining trolley is linear, and the lining trolley cannot be well matched with a curve section when the curve section is constructed, so that in the curve section, a method of reducing the length of concrete poured into the lining trolley at one time is adopted to prevent the lining thickness from meeting the design requirement, or a method of disassembling a needle beam, dividing the needle beam into 2 trolleys and installing a wedge plate to adapt to the curve section is adopted.
The conventional linear pin beam type lining trolley has the following disadvantages:
1. when the curve section is constructed, in order to ensure the lining thickness, the one-time lining length cannot be too long, the number of lining concrete sections is large, the number of construction joints is large, and the quality risk is large;
2. erecting the template and constructing a large amount of waterproof engineering;
3. the lining times are many, the progress is slow, and the labor cost and the equipment cost are high;
4. because the lining concrete has more sections, the construction interference is large, and the organization is difficult.
The traditional stitch-removing type lining trolley for installing the wedge-shaped plate has the following defects:
1. the step of disassembling and installing the wedge-shaped plate of the needle beam is complex, the accuracy of the lining trolley is influenced by repeated disassembly and assembly, and the trolley parts are easy to be locally formed, so that the service life is influenced;
2. the time for installing and dismantling the wedge-shaped template is long, the construction progress is influenced, and the labor cost is high.
Disclosure of Invention
The invention aims to provide a construction method for lining a small-radius tunnel of a shield, which can be used for converting a straight section and a curved section of the tunnel without reducing the length of once-poured concrete and installing and removing a wedge-shaped template.
In order to achieve the aim, the invention provides a shield small-radius tunnel lining construction method, which adopts a needle beam type rotary die full-circle lining trolley for construction, wherein the needle beam type rotary die full-circle lining trolley comprises a needle beam, a needle beam longitudinal moving system, a needle beam front support, a needle beam rear support, a rotary offset frame and a template system; the needle beam and needle beam longitudinal moving system comprises a needle beam and a needle beam longitudinal moving device; the needle beam is of a box-shaped hollow structure, and two pulley holes are longitudinally arranged on the top plate; the needle beam longitudinal moving device comprises a steel wire rope, a steel wire rope retracting and releasing mechanism, a pulley, a self-aligning bearing and a needle beam hinge lug; the needle beam hinge lugs are arranged on two sides of the pulley hole and are positioned in the needle beam; the wheel shaft of the pulley is rotatably connected with the needle beam hinge lug through a self-aligning bearing, and the pulley passes through the pulley hole; the steel wire rope retracting mechanism is arranged in the needle beam; the steel wire rope is wound on the steel wire rope retracting mechanism and bypasses the pulley, and both ends of the steel wire rope penetrate through the pulley holes and are positioned outside the needle beam; the front support and the rear support of the needle beam are supported at the bottom of the needle beam and are respectively close to the front end and the rear end of the needle beam; the plurality of rotary offset frames are sequentially sleeved on the needle beam, and each rotary offset frame comprises an inner frame, an outer frame, inner and outer frame supports, a frame offset force application mechanism and a frame clutch mechanism; the inner frame is a square frame, the inner height of the inner frame is consistent with the outer height of the needle beam, and the inner width of the inner frame is larger than the outer width of the needle beam; the outer frame comprises two outer frame outer rings which are oppositely arranged and outer frame longitudinal beams which are connected with the two outer frame outer rings, the outer frame is sleeved outside the inner frame, the outer frame outer rings and the inner frame are connected through a plurality of inner and outer frame supports, and at least 1 outer frame longitudinal beam is positioned on the left side or the right side of the needle beam; the frame deviation force application mechanism penetrates through a preformed hole of the inner frame, the outer end of the frame deviation force application mechanism is fixedly connected with an outer frame longitudinal beam positioned on the left side or the right side of the needle beam, and the inner end of the frame deviation force application mechanism is longitudinally connected with the corresponding side of the needle beam in a sliding mode; the two groups of frame clutch mechanisms are respectively positioned at the left side and the right side of the inner frame, the first ends of the frame clutch mechanisms are hinged with the outer frame, and the second ends of the frame clutch mechanisms are detachably hinged with the adjacent rotary offset frames;
the template system comprises two end templates and n middle templates arranged between the end templates, wherein n =0, 1, 2 and 3 … …, and the templates are all round;
the end face of the end template is vertical to the axis of the tunnel, and the connecting face connected with the adjacent template is obliquely crossed with the axis of the tunnel;
the calculation formula of the axial longest side length of the end template is
The shortest side length is calculated by the formula
，
In the formula:l 1 the center length of an end template is used, R is the turning radius of a line, and R is the radius of a needle beam type rotary die full-circle lining trolley template, namely the diameter of a tunnel;
the connecting surfaces at two ends of the middle template are obliquely crossed with the axis of the tunnel, and the connecting surfaces at two ends are symmetrically arranged;
the calculation formula of the axial longest side length of the middle template is
The shortest side length is calculated by the formula
，
In the formula:l 2 the center length of the middle template is shown, R is the turning radius of the line, and R is the template radius of the needle beam type rotary die full-circle lining trolley, namely the tunnel diameter;
each template is sleeved on a rotary offset frame and is rotationally connected with the outer frame of the rotary offset frame, and each template is driven to rotate independently through a corresponding rotary driving mechanism;
in the rotary offset frame connected with the end template, at least 1 inner and outer frame support is positioned at the central position above the inner frame and connected with the end part of a steel wire rope;
the construction method comprises the following steps:
s1, extending the front support and the rear support of the needle beam to make the needle beam support the rotary offset frame and the template system;
s2, determining the form of the needle beam type rotary die full-circle lining trolley according to the form of the tunnel
When the tunnel is a straight line section, enabling each template to be longitudinally separated along the needle beam through the frame clutch mechanism, rotating each template to enable the longest edge and the shortest edge of two adjacent templates to be in the same horizontal plane, enabling each template to be longitudinally closed along the needle beam through the frame clutch mechanism, and enabling the templates to form a straight line cylindrical structure adaptive to the straight line section of the tunnel;
when the tunnel is a curve section, enabling the templates to be longitudinally separated along the needle beam through the frame clutch mechanism, rotating the templates to enable the longest edge of each template to be located on the outer ring of the curve section and the shortest edge to be located on the inner ring of the curve section, enabling the longest edge and the longest edge of every two adjacent templates to be located on the same horizontal plane, enabling the shortest edge and the shortest edge to be located on the same horizontal plane, enabling the templates to be longitudinally closed along the needle beam through the frame clutch mechanism, and enabling the templates to form a broken line cylindrical structure adaptive to the curve section of the tunnel;
when the tunnel is a transition section of a straight line and a curve, the template at the straight line section is of a straight line cylindrical structure adaptive to the straight line section of the tunnel, and the template at the curve section is of a broken line cylindrical structure adaptive to the curve section of the tunnel;
s3, longitudinally positioning the needle beam type rotary die full-circle lining trolley
The deviation frame and the template system are rotated by the traction of a steel wire rope and are longitudinally moved to a tunnel design position along the needle beam;
s4, positioning the central line of needle beam type rotary die full-circle lining trolley
Starting the frame offset force application mechanism, and adjusting the transverse position of the rotary offset frame on the needle beam to enable the rotary offset frame to be completely centered;
s5, positioning the needle beam type rotary die full circle lining trolley by elevation
Adjusting the front support and the rear support of the needle beam, and adjusting the height of the needle beam to a designed elevation;
s6, unfolding the panel
Adjusting the template into a full circle to a design position;
s7, placing a balance weight to enable the gravity center of the needle beam type rotary die full-circle lining trolley to move downwards;
s8, end sealing of the head die, water stop belt installation and concrete pouring;
s9, advancing and positioning the needle beam
After the poured concrete is cured to reach the strength, retracting the front support and the rear support of the needle beam, bearing the weight of the template system, enabling the needle beam not to bear the weight, starting the longitudinal moving device of the needle beam to enable the needle beam to move forwards to the position of the next template, then starting the frame offset jack, adjusting the transverse position of the needle beam to enable the starting point and the ending point of the needle beam to be positioned on the central line of the tunnel, then extending the front support and the rear support of the needle beam, and enabling the needle beam to support the rotary offset frame and the template system again;
s10, demolding
S11, next cycle
Step S2-11 is repeated.
Further, the needle beam type rotary die full-circle lining trolley further comprises a counterweight system for applying downward pressure to the template.
Furthermore, a transverse moving chute is longitudinally arranged on the left side or the right side of the needle beam and is of an inward concave type with a small outside and a large inside; the outer frame longitudinal beam positioned on the side of the transverse sliding chute is aligned with the transverse sliding chute; the frame offset force application mechanism comprises a frame offset jack and a longitudinal sliding offset trolley; the longitudinal sliding and shifting trolley comprises a pulley, a bottom plate and a trolley hinge lug, wherein the pulley and the trolley hinge lug are respectively arranged on two sides of the bottom plate, and the pulley is in sliding fit with the transverse sliding chute; the outer end of the frame offset jack is fixedly connected with an outer frame longitudinal beam positioned on the outer side of the transverse sliding chute, and the inner end of the frame offset jack is hinged with a trolley hinge lug.
Furthermore, in each rotary offset frame, at least two inner and outer frames are supported and arranged at the left side and the right side of the inner frame; the frame clutch mechanism is a frame clutch oil cylinder, and the first end of the frame clutch oil cylinder is hinged with the inner frame and the outer frame at the same side.
Further, the rotating offset frame further comprises an external tooth slewing bearing and a toothless slewing bearing; the two outer frame outer rings are respectively and fixedly connected with the inner ring of the external tooth slewing bearing and the inner ring of the toothless slewing bearing; the template is fixedly connected with the outer ring of the external tooth slewing bearing and the outer ring of the toothless slewing bearing; the rotary driving mechanism comprises a variable frequency motor and driving teeth; the variable frequency motor is fixed on the outer frame longitudinal beam, and an output shaft is connected with the driving teeth; the driving teeth are meshed with a gear ring on an outer ring of the external tooth slewing bearing.
Furthermore, the end template and the middle template comprise outer molds, rotary outer rings, rotary inner rings, outer ring longitudinal beams, inner and outer ring supports and demolding oil cylinders; the outer mold is formed by enclosing a plurality of arc-shaped templates; the two rotary outer rings are oppositely arranged and connected through a plurality of outer ring longitudinal beams; the rotating inner ring is positioned in the rotating outer ring and is connected with the rotating outer ring through a plurality of inner and outer ring supports; the two rotating inner rings are respectively and fixedly connected with the outer ring of the external tooth slewing bearing and the outer ring of the toothless slewing bearing; two ends of the demoulding oil cylinder are respectively hinged with the arc-shaped template and the outer ring longitudinal beam.
Furthermore, each rotary offset frame is provided with a counterweight system, and each counterweight system comprises a counterweight block and a counterweight oil cylinder; a balance weight reserved space without an outer frame longitudinal beam and an outer ring longitudinal beam is arranged right below the inner frame; the top of counter weight hydro-cylinder is fixed in the bottom of inner frame, and the bottom is connected with the balancing weight, and counter weight hydro-cylinder and balancing weight all can pass the counter weight headspace and exert the holding down force to the template.
Further, the outer die comprises a top die, a bottom die and a side die for connecting the top die and the bottom die; stiffening ribs are longitudinally arranged on the inner walls of the top die, the bottom die and the side die; a template cross beam is arranged between the stiffening ribs of the top mold and the bottom mold, and a pumping port and a balancing weight frame for accommodating a balancing weight are arranged on a surrounding area of the stiffening ribs and the template cross beam; a pouring window capable of being opened inwards is arranged on the side mold; the demoulding oil cylinder comprises a top mould demoulding oil cylinder, a bottom mould demoulding oil cylinder and a side mould demoulding oil cylinder; two ends of a top mold demolding oil cylinder are respectively hinged with a template cross beam of a top mold and an outer ring longitudinal beam positioned above the rotary inner ring; two ends of the bottom die demoulding oil cylinder are respectively hinged with a template cross beam of the bottom die and an outer ring longitudinal beam positioned below the rotary inner ring; two ends of the side die demoulding oil cylinder are respectively hinged with the stiffening ribs of the side die and the outer ring longitudinal beam positioned on the side surface of the rotary inner ring.
Furthermore, the steel wire rope retracting and releasing mechanism comprises a motor, a driving gear connected with an output shaft of the motor, a roller rotatably arranged in the needle beam and a driven gear connected with the roller; two ends of the roller are provided with rope blocks; the axis of the driven gear is collinear with the axis of the roller, and the driven gear is meshed with the driving gear; the middle part of the steel wire rope is fixed on the roller through a rope clamp, the steel wire rope is wound between the rope blocks on the two sides in a one-way mode, and rope buckles are arranged at the two ends of the steel wire rope; the needle beam front support comprises a front telescopic oil cylinder and a front supporting block, and the needle beam rear support comprises a rear telescopic oil cylinder and a rear supporting block; the front supporting block is supported on the unlined segment, and two ends of the front telescopic oil cylinder are respectively connected with the needle beam and the front supporting block; the rear supporting block is supported on the lining concrete, and two ends of the rear telescopic oil cylinder are respectively connected with the needle beam and the rear supporting block.
The invention has the following advantages:
1. the construction from the straight line section to the curve section does not need to disassemble and assemble the wedge-shaped plate, the interchange of the straight line section and the curve section can be completed only by rotating the template, and the operation is simple;
2. the length and the number of sections of the lining trolley can be set according to requirements, and the template of the lining trolley is quickly adjusted to be in a zigzag shape to adapt to the curve section;
3. the length of the liner at one time in the curve section can reach the length of the straight line section, so that the steps of erecting a head die, waterproofing the head and the like are reduced, and the workload is reduced;
4. need not dismouting wedge-shaped plate, reduced the construction interference of each process. And meanwhile, the construction progress can be increased.
Drawings
FIG. 1 is a perspective view of a needle beam type rotary die full circle lining trolley in embodiment 1;
FIG. 2 is a lining state diagram of a needle beam type rotary die full circle lining trolley in a straight line section;
FIG. 3 is a diagram showing a lining state when a needle beam type rotary die full circle lining trolley enters a curve section;
FIG. 4 is a block diagram of a needle beam;
FIG. 5 is an enlarged view of the end of the needle beam;
FIG. 6 is a schematic view of the installation of the needle beam longitudinal moving device;
FIG. 7 is a schematic structural view of the wire rope retracting mechanism of FIG. 6;
FIG. 8 is a schematic view of the installation of the pulley of FIG. 6;
FIG. 9 is a schematic view of the mounting of the needle beam front support and the needle beam rear support;
FIG. 10 is a schematic view of the installation of a rotating offset frame;
FIG. 11 is a schematic view of the installation of the inner frame of FIG. 10;
FIG. 12 is a schematic view of the mounting of the outer frame of FIG. 10;
FIG. 13 is an elevation view of the offset jack of the frame of FIG. 10;
FIG. 14 is a perspective view of FIG. 13;
FIG. 15 is a block diagram of the pitch and roll shift trolley of FIG. 14;
FIG. 16 is another side view of FIG. 10;
FIG. 17 is a position diagram of the frame clutch cylinder;
FIG. 18 is a schematic view of the installation of the formwork system;
FIG. 19 is a front view of FIG. 18;
FIG. 20 is a schematic view of the installation of the rotating inner and outer rings and the stripper cylinder;
FIG. 21 is a schematic structural view of an outer mold;
FIG. 22 is a position diagram of the weight frame of FIG. 21;
FIG. 23 is a schematic view of the installation of a pouring window;
FIG. 24 is an installation schematic of the counterweight system;
FIG. 25 is a schematic view of the pulley angle during longitudinal displacement of the needle beam at a curved section;
fig. 26 is an enlarged view of the pulley angle of fig. 25.
In the figure: 1-inner wall of tunnel segment;
2-needle beam and needle beam longitudinal moving system, 2.1-needle beam, 2.2.1-motor and gear, 2.2.2-steel wire rope, 2.2.3-rope buckle, 2.2.4-roller and gear, 2.2.5-rope clip, 2.2.6-pulley, 2.2.7-self-aligning bearing, 2.2.8-needle beam hinge lug, 2.2.9-rope block, 2.3-transverse moving chute and 2.4-pulley hole;
3-needle beam front support, 3.1-front telescopic oil cylinder, 3.2-front support block;
4-needle beam rear support, 4.1-rear telescopic oil cylinder, 4.2-rear support block;
5-end template A, 5.1-outer mold, 5.1.1-top mold, 5.1.2-bottom mold, 5.1.3-side mold, 5.1.4-stiffening rib, 5.1.5-template beam, 5.1.6-pumping port, 5.1.7-counterweight frame, 5.1.8-pouring window, 5.1.9-window hinge, 5.2-rotating outer ring, 5.3-rotating inner ring, 5.4-outer ring longitudinal beam, 5.5-inner and outer ring support, 5.6-top mold stripping oil cylinder, 5.7-bottom mold stripping oil cylinder and 5.8-side mold oil cylinder;
6-middle template A, 7-middle template B and 8-end template B;
9-rotating offset frame A, 9.1-inner frame, 9.1.1-preformed hole, 9.2-outer frame outer ring, 9.3-outer frame longitudinal beam, 9.4-inner and outer frame support, 9.5-flange, 9.6-frame offset jack, 9.7-longitudinal sliding offset trolley, 9.7.1-pulley, 9.7.2-bottom plate, 9.7.3-trolley hinge lug, 9.8-frame clutch oil cylinder, 9.9-outer tooth slewing bearing, 9.10-toothless slewing bearing, 9.11-variable frequency motor, 9.12-driving tooth and 9.13-motor support;
10-rotational offset frame B, 11-rotational offset frame C, 12-rotational offset frame D;
13-counterweight system, 13.1-counterweight block, 13.2-counterweight cylinder;
5-1 is the shortest side of the end template A, 5-2 is the longest side of the end template A, 6-1 is the shortest side of the middle template A, 6-2 is the longest side of the middle template A, 7-1 is the shortest side of the middle template B, 7-2 is the longest side of the middle template B, 8-1 is the shortest side of the end template B, and 8-2 is the longest side of the end template B.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a needle beam type rotary die full-circle lining trolley which comprises a needle beam, a needle beam longitudinal moving system 2, a needle beam front support 3, a needle beam rear support 4, a rotary offset frame and a template system, wherein the needle beam is arranged on the needle beam longitudinal moving system;
the needle beam and needle beam longitudinal moving system 2 comprises a needle beam 2.1 and a needle beam longitudinal moving device; the needle beam 2.1 is of a box-shaped hollow structure and made of steel, and two pulley holes 2.4 are longitudinally formed in the top plate; the needle beam longitudinal moving device comprises a steel wire rope 2.2.2, a steel wire rope retracting mechanism, a pulley 2.2.6, a self-aligning bearing 2.2.7 and a needle beam hinge lug 2.2.8; the needle beam hinge lugs 2.2.8 are arranged on two sides of the pulley hole 2.4 and are positioned in the needle beam 2.1; the wheel shaft of the pulley 2.2.6 is rotatably connected with the pin beam hinge lug 2.2.8 through the self-aligning bearing 2.2.7, the pulley 2.2.6 penetrates through the pulley hole 2.4, only a small part of the pulley 2.2.6 is exposed outside through the pulley hole 2.4 reserved in the pin beam 2.1, and therefore the pollution of foreign matters such as external construction concrete blocks, gravels and the like can be effectively avoided; the steel wire rope retracting mechanism is arranged in the needle beam 2.1; the steel wire rope 2.2.2 is wound on the steel wire rope retracting mechanism and bypasses the pulley 2.2.6, and both ends of the steel wire rope penetrate through the pulley hole 2.4 and are positioned outside the needle beam 2.1;
the front needle beam support 3 and the rear needle beam support 4 are supported at the bottom of the needle beam 2.1 and are respectively close to the front end and the rear end of the needle beam 2.1;
the plurality of rotary offset frames are sequentially sleeved on the needle beam 2.1, in the embodiment, a rotary offset frame A9, a rotary offset frame B10, a rotary offset frame C11 and a rotary offset frame D12 are sequentially arranged from back to front, the structure of the rotary offset frame is described in detail by taking the rotary offset frame A9 as an example, and each rotary offset frame comprises an inner frame 9.1, an outer frame, an inner frame support 9.4, an outer frame support 9.4, a frame offset force application mechanism and a frame clutch mechanism; the inner frame 9.1 is a square frame, is sleeved outside the needle beam 2.1, has the inner height consistent with the outer height of the needle beam 2.1 and the inner width larger than the outer width of the needle beam 2.1 so as to form a certain angle with the needle beam 2.1 on the plane; the outer frame comprises two outer frame outer rings 9.2 which are oppositely arranged and outer frame longitudinal beams 9.3 which are connected with the two outer frame outer rings 9.2, the outer frame is sleeved outside the inner frame 9.1, the outer frame outer rings 9.2 and the inner frame 9.1 are connected through a plurality of inner and outer frame supports 9.4, and at least 1 outer frame longitudinal beam 9.3 is positioned on the left side or the right side of the needle beam 2.1 and used as a counter force point of the frame offset force application mechanism; the frame offset force application mechanism penetrates through a reserved hole 9.1.1 of the inner frame 9.1, the outer end of the frame offset force application mechanism is fixedly connected with an outer frame longitudinal beam 9.3 positioned on the left side or the right side of the needle beam 2.1, the inner end of the frame offset force application mechanism is longitudinally and slidably connected with the corresponding side of the needle beam 2.1, transverse offset force is applied to the inner frame 9.1, the outer frame and the inner and outer frame supports 9.4, and the position is adjusted to enable the rotary offset frame to be in a central position, namely the starting point and the ending point of the central line of the rotary offset frame and the template are positioned on the tunnel axis; the two groups of frame clutch mechanisms are respectively positioned at the left side and the right side of the inner frame 9.1, the first ends of the frame clutch mechanisms are hinged with the outer frame, and the second ends of the frame clutch mechanisms are detachably hinged with the adjacent rotary offset frames;
the template system comprises two end templates and n middle templates arranged between the end templates, wherein n =0, 1, 2 and 3 … …, and the templates are all round; the end face of the end template is vertical to the axis of the tunnel, and the connecting face connected with the adjacent template is obliquely crossed with the axis of the tunnel;
the calculation formula of the axial longest side length of the end template is
The shortest side length is calculated by the formula
，
In the formula:l 1 the central length of an end template is used, R is a line turning radius, and R is the radius of a shield small-radius tunnel needle beam type rotary die full-circle lining trolley template, namely the tunnel diameter;
the connecting surfaces at two ends of the middle template are obliquely crossed with the axis of the tunnel, and the connecting surfaces at two ends are symmetrically arranged;
the calculation formula of the axial longest side length of the middle template is
The shortest side length is calculated by the formula
，
In the formula:l 2 the central length of the middle template, R is the turning radius of the line, and R is the template radius of the shield small-radius tunnel needle beam type rotary die full-circle lining trolley, namely the tunnel diameter;
each template is sleeved on a rotary offset frame and is rotationally connected with the outer frame of the rotary offset frame, and each template is driven to rotate independently through a corresponding rotary driving mechanism, and in the embodiment, an end template A5, an intermediate template A6, an intermediate template B7 and an end template B8 are sequentially arranged from back to front; in the rotationally offset frame connected to the end forms, at least 1 inner and outer frame support 9.4 is connected to the ends of the wire ropes 2.2.2 at a central position above the inner frame 9.1.
In this embodiment, the offset frame structure associated with the end forms and the offset frame structure associated with the intermediate form are identical to simplify installation, i.e., at least 1 inner and outer frame support 9.4 is centrally located above the inner frame 9.1 on each offset frame.
Further, the full circle lining trolley for the shield small-radius tunnel needle beam type rotary mold further comprises a counterweight system 13 for applying downward pressure to the template. In this embodiment, the shortest side and longest side are established to full circle template, consequently, have the asymmetric problem about template weight, set up counter weight system 13 and make template system focus move down, increase stability, increase the whole weight of lining cutting platform truck simultaneously, effectively offset the buoyancy of concrete placement in-process.
Furthermore, a transverse sliding chute 2.3 is longitudinally arranged on the left side or the right side of the needle beam 2.1, and an outer frame longitudinal beam 9.3 positioned on the side of the transverse sliding chute 2.3 is aligned with the transverse sliding chute 2.3; the frame offset force application mechanism comprises a frame offset jack 9.6 and a longitudinal sliding offset trolley 9.7; the longitudinal sliding deviation trolley 9.7 comprises a pulley 9.7.1, a bottom plate 9.7.2 and a trolley hinge lug 9.7.3, the pulley 9.7.1 and the trolley hinge lug 9.7.3 are respectively arranged at two sides of the bottom plate 9.7.2, and a pulley 9.7.1 is in sliding fit with the transverse sliding chute 2.3; the outer end of the frame offset jack 9.6 is fixedly connected with an outer frame longitudinal beam 9.3 positioned outside the transverse sliding chute 2.3, and the inner end is hinged with a trolley hinge lug 9.7.3. When the rotary offset frame moves back and forth, the longitudinal sliding offset trolley 9.7 slides freely along with the rotary offset frame, and when the rotary offset frame 9 needs to be offset left and right, the longitudinal sliding offset trolley 9.7 is clamped on the inner wall of the transverse sliding chute 2.3 and serves as an acting point of the inner end of the frame offset jack 9.6.
Further, the traverse chute 2.3 is a concave type with a small outside and a large inside, and the pulley 9.7.1 can be blocked in the traverse chute 2.3 and cannot be transversely separated.
Furthermore, in each rotary offset frame, at least two inner and outer frame supports 9.4 are arranged at the left side and the right side of the inner frame 9.1; the frame clutch mechanism is a frame clutch oil cylinder 9.8, and the first end of the frame clutch oil cylinder 9.8 is hinged with the inner frame support 9.4 on the same side.
Further, the concrete mode of the template and the outer frame is that: the rotating offset frame further comprises an external toothed slew bearing 9.9 and a toothless slew bearing 9.10; the two outer frame outer rings 9.2 are respectively and fixedly connected with the inner ring of the external tooth slewing bearing 9.9 and the inner ring of the toothless slewing bearing 9.10; the template is fixedly connected with the outer ring of the external tooth slewing bearing 9.9 and the outer ring of the toothless slewing bearing 9.10; the rotary driving mechanism comprises a variable frequency motor 9.11 and a driving tooth 9.12; the variable frequency motor 9.11 is fixed on the outer frame longitudinal beam 9.3 through a motor support 9.13, and an output shaft is connected with the driving teeth 9.12; the drive teeth 9.12 mesh with a gear ring on the outer ring of the external-tooth slewing bearing 9.9. The driving teeth 9.12 drive the outer ring of the external tooth slewing bearing 9.9 to rotate, and the template rotates along with the outer ring.
Furthermore, the end template and the middle template respectively comprise an outer die 5.1, a rotary outer ring 5.2, a rotary inner ring 5.3, an outer ring longitudinal beam 5.4, an inner ring support 5.5, an outer ring support 5.5 and a demoulding oil cylinder; the outer mold 5.1 is formed by enclosing a plurality of arc-shaped templates; the two rotary outer rings 5.2 are oppositely arranged and are connected through a plurality of outer ring longitudinal beams 5.4; the rotating inner ring 5.3 is positioned in the rotating outer ring 5.2 and is connected by a plurality of inner and outer ring supports 5.5; the two rotating inner rings 5.3 are respectively and fixedly connected with the outer ring of the external tooth slewing bearing 9.9 and the outer ring of the toothless slewing bearing 9.10; two ends of the demoulding oil cylinder are respectively hinged with the arc-shaped template and the outer ring longitudinal beam 5.4.
Furthermore, each rotary offset frame is provided with a counterweight system 13, and each counterweight system 13 comprises a counterweight block 13.1 and a counterweight oil cylinder 13.2; a balance weight reserved space without an outer frame longitudinal beam 9.3 and an outer ring longitudinal beam 5.4 is arranged right below the inner frame 9.1; the top end of the counterweight oil cylinder 13.2 is fixed at the bottom of the inner frame 9.1, the bottom end of the counterweight oil cylinder is connected with the counterweight block 13.1, and the counterweight oil cylinder 13.2 and the counterweight block 13.1 can penetrate through the counterweight reserved space to apply downward pressure to the template.
Further, the counterweight cylinder 13.2 is a multi-stage telescopic cylinder, and when the counterweight system is completely retracted, the counterweight 13.1 and the counterweight block are required to be retracted to the upper part of the outer ring longitudinal beam 5.4, so that any part of the counterweight system 13 can be completely avoided when the template system rotates.
Further, the external mold 5.1 comprises a top mold 5.1.1, a bottom mold 5.1.2 and a side mold 5.1.3 connecting the top mold 5.1.1 and the bottom mold 5.1.2; stiffening ribs 5.1.4 are longitudinally arranged on the inner walls of the top die 5.1.1, the bottom die 5.1.2 and the side die 5.1.3; a template beam 5.1.5 is arranged between the stiffening ribs 5.1.4 of the top mold 5.1.1 and the bottom mold 5.1.2, and a pumping port 5.1.6 and a balancing weight frame 5.1.7 for accommodating a balancing weight 13.1 are arranged on a combined area enclosed by the stiffening ribs 5.1.4 and the template beam 5.1.5; because the template needs to rotate, the pouring window 5.1.8 can not be arranged in a traditional downward opening mode, therefore, the pouring window 5.1.8 which can be opened inwards is arranged on the side die 5.1.3, and the window hinge joint 5.1.9 is arranged on the left side or the right side; the demoulding oil cylinder comprises a top mould demoulding oil cylinder 5.6, a bottom mould demoulding oil cylinder 5.7 and a side mould demoulding oil cylinder 5.8; two ends of a top mould demoulding oil cylinder 5.6 are respectively hinged with a template beam 5.1.5 of the top mould 5.1.1 and an outer ring longitudinal beam 5.4 positioned above the rotary inner ring 5.3; two ends of a bottom die demoulding oil cylinder 5.7 are respectively hinged with a template beam 5.1.5 of a bottom die 5.1.2 and an outer ring longitudinal beam 5.4 positioned below a rotary inner ring 5.3; two ends of the side mould demoulding oil cylinder 5.8 are respectively hinged with the stiffening ribs 5.1.4 of the side mould 5.1.3 and the outer ring longitudinal beam 5.4 positioned on the side surface of the rotary inner ring 5.3.
Further, flanges 9.5 are sleeved outside the two outer frame outer rings 9.2, and the two flanges 9.5 are respectively connected with the inner ring of the outer tooth slewing bearing 9.9 and the inner ring of the toothless slewing bearing 9.10 through bolts; the two rotating inner rings 5.3 are respectively and fixedly connected with the outer ring of the external tooth slewing bearing 9.9 and the outer ring of the toothless slewing bearing 9.10 through bolts.
Further, the steel wire rope retracting mechanism comprises a motor, a driving gear connected with an output shaft of the motor, a roller rotatably arranged in the needle beam 2.1 and a driven gear connected with the roller; rope stoppers 2.2.9 are arranged at two ends of the roller; the axis of the driven gear is collinear with the axis of the roller, and the driven gear is meshed with the driving gear; the middle part of the steel wire rope 2.2.2 is fixed on the roller through a rope clip 2.2.5, so that the steel wire rope 2.2.2 is prevented from slipping when being folded and unfolded, the steel wire rope 2.2.2 is clockwise or anticlockwise wound between the rope baffles 2.2.9 on the two sides in a one-way mode, the winding length of the steel wire rope 2.2.2 in the rope baffle 2.2.9 is larger than half of the length of the needle beam 2.1, and rope buckles 2.2.3 are arranged at the two ends of the steel wire rope, so that the steel wire rope is connected with an inner frame support 9.4 positioned at the center position above the inner frame 9.1.
Further, the needle beam front support 3 comprises a front telescopic oil cylinder 3.1 and a front support block 3.2, and the needle beam rear support 4 comprises a rear telescopic oil cylinder 4.1 and a rear support block 4.2; the front supporting block 3.2 is supported on the unlined segment, and two ends of the front telescopic oil cylinder 3.1 are respectively connected with the needle beam 2.1 and the front supporting block 3.1; the rear supporting block 4.2 is supported on the lining concrete, and two ends of the rear telescopic oil cylinder 4.1 are respectively connected with the needle beam 2.1 and the rear supporting block 4.2. Because the front support 3 of the needle beam is supported on the unlined pipe sheet and the rear support 4 of the needle beam is supported on the lining concrete, the stroke of the front telescopic oil cylinder 3.1 is at least larger than the sum of the stroke of the rear telescopic oil cylinder 4.1 and the lining thickness, and the trolley support is the same as that of the prior art.
Further, the length of the needle beam 2.1 is 2 times larger than that of the total template, the transverse sliding chute 2.3 is arranged at the full length, and the steel wire rope 2.2.2 is arranged at the full length.
In this embodiment, the front telescopic cylinder 3.1, the rear telescopic cylinder 4.1, the frame offset jack of each rotationally offset frame, the frame clutch cylinder, and the counterweight cylinder 13.2 of the counterweight system share one set of hydraulic pipeline, and since the demolding cylinder of the template system rotates along with the template system and the other cylinders do not rotate, the demolding cylinder uses one set of hydraulic pipeline alone.
Example 2
The embodiment provides a shield small-radius tunnel lining construction method, which adopts the needle beam type rotary die full-circle lining trolley construction described in the embodiment 1, and comprises the following steps:
s1, placing the needle beam type rotary die full-circle lining trolley in a tunnel to be lined, extending a front support 3 and a rear support 4 of the needle beam, and enabling a needle beam 2.1 to support a rotary offset frame and a template system;
s2, determining the form of the needle beam type rotary die full-circle lining trolley according to the form of the tunnel
When the tunnel is a straight line segment, the method comprises the following steps:
a, longitudinally separating each template along a needle beam 2.1 through a frame clutch mechanism, specifically, extending all frame clutch cylinders 9.8 to longitudinally separate each rotary offset frame and the template connected with the rotary offset frame;
b, lifting counterweight system 13: operating all the counterweight cylinders 13.2, lifting all the counterweight blocks 13.1 to the upper side of the outer ring longitudinal beam 5.4 so as to avoid the counterweight system 13 when the template system rotates, and taking out the counterweight blocks 13.1 if manual counterweight is adopted;
c, rotating each template to enable the longest edge and the shortest edge of the two adjacent templates to be in the same horizontal plane:
d, enabling each template to be longitudinally closed along the needle beam 2.1 through a frame clutch mechanism, specifically retracting all frame clutch oil cylinders 9.8, enabling each rotary offset frame and the template connected with the rotary offset frame to be longitudinally closed, and enabling a plurality of templates to form a linear cylindrical structure adaptive to a tunnel linear section;
when the tunnel is a curve segment, the method comprises the following steps:
a, longitudinally separating each template along a needle beam 2.1 through a frame clutch mechanism, specifically, extending all frame clutch cylinders 9.8 to longitudinally separate each rotary offset frame and the template connected with the rotary offset frame;
b, lifting counterweight system 13: operating all the counterweight cylinders 13.2, lifting all the counterweight blocks 13.1 to the upper side of the outer ring longitudinal beam 5.4 so as to avoid the counterweight system 13 when the template system rotates, and taking out the counterweight blocks 13.1 if manual counterweight is adopted;
c, rotating each template to enable the longest edge of each template to be located in the outer ring of the curve section and the shortest edge to be located in the inner ring of the curve section, enabling the longest edge and the longest edge of every two adjacent templates to be located in the same horizontal plane, and enabling the shortest edge and the shortest edge to be located in the same horizontal plane;
d, enabling each template to be longitudinally closed along the needle beam through a frame clutch mechanism, and enabling a plurality of templates to form a polygonal line cylindrical structure adaptive to the curve section of the tunnel;
when the tunnel is a transition section of a straight line and a curve, the template at the straight line section is of a straight line cylindrical structure adaptive to the straight line section of the tunnel, and the template at the curve section is of a broken line cylindrical structure adaptive to the curve section of the tunnel;
s3, longitudinally positioning the needle beam type rotary die full-circle lining trolley
Starting a steel wire rope retracting and releasing mechanism, and dragging the rotary offset frame and the template connected with the rotary offset frame to longitudinally move to a tunnel design position along the needle beam 2.1 through a steel wire rope 2.2.2;
s4, positioning the central line of needle beam type rotary die full-circle lining trolley
Starting a frame offset force application mechanism, adjusting the transverse position of the rotary offset frame on the needle beam 2.1, and enabling the rotary offset frame to be completely centered (the starting point and the end point of the center line of the template are positioned on the tunnel axis);
s5, positioning the needle beam type rotary die full circle lining trolley by elevation
Adjusting a front needle beam support 3 and a rear needle beam support 4, and adjusting the height of the needle beam 2.1 to a designed elevation, wherein the step is consistent with the traditional elevation adjusting step;
s6, unfolding the panel
Firstly operating a top die demoulding oil cylinder 5.6 and a bottom die demoulding oil cylinder 5.7, adjusting the heights of the top die and the bottom die, then operating a side die demoulding oil cylinder 5.8, adjusting the width of a side die 5.1.3, and adjusting the template to be a full circle to a designed position, wherein the step is consistent with the traditional template adjusting step;
s7, placing a balance weight, specifically, operating all balance weight oil cylinders 13.2, lowering all balance weight blocks 13.1, and lowering the balance weight blocks 13.1 into balance weight block frames 5.1.7, or manually balancing to move the center of gravity of the needle beam type rotary die full circle lining trolley downwards;
s8, end-sealing head die, installing water stop belt and pouring concrete
The method comprises the steps of end-sealing a head die, installing a water stop belt and the like, and pouring concrete after acceptance inspection is qualified, wherein the pouring concrete is consistent with the pouring concrete of the traditional needle beam type lining trolley;
s9, advancing and positioning the needle beam
After the poured concrete is cured to reach the strength, retracting the front support 3 and the rear support 4 of the needle beam, bearing the weight of the template system, enabling the needle beam 2.1 not to bear the weight, starting the longitudinal movement device of the needle beam to enable the needle beam 2.1 to move forwards to the position of the next mould, then starting the frame offset jack 9.6, adjusting the transverse position of the needle beam 2.1 to enable the start point and the end point of the needle beam 2.1 to be positioned on the central line of the tunnel, then extending the front support 3 and the rear support 4 of the needle beam, and enabling the needle beam 2.1 to support the rotary offset frame and the template system again;
s10, demolding
After the needle beam 2.1 supports the weight of the lining trolley, firstly lifting the counterweight oil cylinder 13.2, then retracting the side die demoulding oil cylinder 5.8 to demould the side die 5.1.3, and then retracting the top die demoulding oil cylinder 5.6 and the bottom die demoulding oil cylinder 5.7 to demould the top die and the bottom die;
s11, next cycle
Step S2-11 is repeated.
As shown in fig. 3, in the curve section, the axis of the needle beam 2.1 is not coincident with the axis of the rotary offset frame, and the offset frame moves a certain angle on the needle beam 2.1, so that in the process of longitudinal movement of the needle beam 2.1, the pulley 2.2.6 and the steel wire rope 2.2.2 have a certain angle with the inner and outer frame supports 9.4 positioned at the central position above the inner frame 9.1, and the pulley 2.2.6 and the needle beam hinge lug 2.2.8 are connected by using the self-aligning bearing 2.2.7, so that the pulley 2.2.6 can deflect a certain angle to adapt to the situation that the rope buckle 2.2.3 position of the steel wire rope 2.2.2 is moved transversely when the needle beam 2.1 is moved longitudinally or the template system is moved transversely. At this point, the rotating offset frame makes an angle with the needle beam 2.1, which is schematically shown in fig. 25.
Finally, it should be noted that: all other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention, including but not limited to the following extended embodiments:
in the embodiment, the number of the templates is 4, the 4 templates are determined based on the factors such as the total weight of the trolley, the on-site concrete pouring capacity, the width of the conventional panel in the market and the like, and the number of the templates which are adopted is less than 4 or more than 4, which is the result obtained or obtained without creative labor by ordinary technicians in the field;
in each set of template in the embodiment, the full-circle template is divided into 4 blocks of bottom die, top die and 2 side dies, and the division into 4 blocks is convenient for demoulding or template positioning operation, under the condition that the tunnel hole diameter is larger, the full-circle template can be larger than 4 blocks, and the increase of other parts caused by the larger than 4 blocks is also a result obtained or obtained without creative labor by ordinary technicians in the field;
in the embodiment, the number of the frame clutch oil cylinders and the number of the frame offset jacks are both 2, and the adoption of more than 2 is also a result obtained without creative labor by ordinary technicians in the field;
in the embodiment, the template rotation adopts a motor and an external tooth slewing bearing, the template rotation function is achieved in other mechanical modes, the function of mutual conversion between a full-circle needle beam type trolley construction straight line section and a small-radius curve section is achieved through the template rotation function, and the result can be obtained by combining the embodiment with the conventional technology by the ordinary skilled person in the art;
in the embodiment, the counterweight system adopts the oil cylinder to telescopically lift or lower the counterweight block to realize the counterweight again after the template system rotates, and the counterweight after the template system rotates is realized by adopting manual carrying or other mechanical modes, which is the result obtained or obtained without creative labor by ordinary technicians in the field;
the number and position of the pouring windows, the number and position of the top-bottom pump pipes, the position and number of the panel stiffeners and other functional components are all examples in the embodiment, and the change of the arrangement to form a new embodiment is also a result which is obtained or obtained without creative labor of the ordinary skilled person.
Claims (9)
1. A shield small-radius tunnel lining construction method is characterized in that a needle beam type rotary die full-circle lining trolley is adopted for construction, and the needle beam type rotary die full-circle lining trolley comprises a needle beam, a needle beam longitudinal moving system, a needle beam front support, a needle beam rear support, a rotary offset frame and a template system;
the needle beam and needle beam longitudinal moving system comprises a needle beam and a needle beam longitudinal moving device;
the needle beam is of a box-shaped hollow structure, and two pulley holes are longitudinally formed in the top plate;
the needle beam longitudinal moving device comprises a steel wire rope, a steel wire rope retracting and releasing mechanism, a pulley, a self-aligning bearing and a needle beam hinge lug;
the needle beam hinge lugs are arranged on two sides of the pulley hole and are positioned in the needle beam;
the wheel shaft of the pulley is rotatably connected with the needle beam hinge lug through a self-aligning bearing, and the pulley passes through the pulley hole;
the steel wire rope retracting and releasing mechanism is arranged in the needle beam;
the steel wire rope is wound on the steel wire rope retracting mechanism and bypasses the pulley, and two ends of the steel wire rope penetrate through the pulley holes and are positioned outside the needle beam;
the front support and the rear support of the needle beam are supported at the bottom of the needle beam and are respectively close to the front end and the rear end of the needle beam;
the plurality of rotary offset frames are sequentially sleeved on the needle beam, and each rotary offset frame comprises an inner frame, an outer frame, inner and outer frame supports, a frame offset force application mechanism and a frame clutch mechanism;
the inner frame is a square frame, is sleeved outside the needle beam, has the inner height consistent with the outer height of the needle beam, and has the inner width larger than the outer width of the needle beam;
the outer frame comprises two outer frame outer rings which are oppositely arranged and outer frame longitudinal beams which are connected with the two outer frame outer rings, the outer frame is sleeved outside the inner frame, the outer frame outer rings and the inner frame are connected through a plurality of inner and outer frame supports, and at least 1 outer frame longitudinal beam is positioned on the left side or the right side of the needle beam;
the frame deviation force application mechanism penetrates through a preformed hole of the inner frame, the outer end of the frame deviation force application mechanism is fixedly connected with an outer frame longitudinal beam positioned on the left side or the right side of the needle beam, and the inner end of the frame deviation force application mechanism is longitudinally connected with the corresponding side of the needle beam in a sliding mode;
the two groups of frame clutch mechanisms are respectively positioned at the left side and the right side of the inner frame, the first ends of the frame clutch mechanisms are hinged with the outer frame, and the second ends of the frame clutch mechanisms are detachably hinged with the adjacent rotary offset frames;
the template system comprises two end templates and n middle templates arranged between the end templates, wherein n =0, 1, 2 and 3 … …, and the templates are all round;
the end face of the end template is vertical to the axis of the tunnel, and the connecting face connected with the adjacent template is obliquely crossed with the axis of the tunnel;
the calculation formula of the axial longest side length of the end template is
The shortest side length is calculated by the formula
，
In the formula:l 1 the center length of an end template is used, R is the turning radius of a line, and R is the radius of a needle beam type rotary die full-circle lining trolley template, namely the diameter of a tunnel;
the connecting surfaces at two ends of the middle template are obliquely crossed with the axis of the tunnel, and the connecting surfaces at two ends are symmetrically arranged;
the calculation formula of the axial longest side length of the middle template is
The shortest side length is calculated by the formula
，
In the formula:l 2 the center length of the middle template is shown, R is the turning radius of the line, and R is the template radius of the needle beam type rotary die full-circle lining trolley, namely the tunnel diameter;
each template is sleeved on a rotary offset frame and is rotationally connected with the outer frame of the rotary offset frame, and each template is driven to rotate independently through a corresponding rotary driving mechanism;
in the rotary offset frame connected with the end template, at least 1 inner and outer frame support is positioned at the central position above the inner frame and connected with the end part of a steel wire rope;
the construction method comprises the following steps:
s1, extending the front support and the rear support of the needle beam to make the needle beam support the rotary offset frame and the template system;
s2, determining the form of the needle beam type rotary die full-circle lining trolley according to the form of the tunnel
When the tunnel is a straight line section, enabling each template to be longitudinally separated along the needle beam through the frame clutch mechanism, rotating each template to enable the longest edge and the shortest edge of two adjacent templates to be in the same horizontal plane, enabling each template to be longitudinally closed along the needle beam through the frame clutch mechanism, and enabling the templates to form a straight line cylindrical structure adaptive to the straight line section of the tunnel;
when the tunnel is a curve section, enabling the templates to be longitudinally separated along the needle beam through the frame clutch mechanism, rotating the templates to enable the longest edge of each template to be located on the outer ring of the curve section and the shortest edge to be located on the inner ring of the curve section, enabling the longest edge and the longest edge of every two adjacent templates to be located on the same horizontal plane, enabling the shortest edge and the shortest edge to be located on the same horizontal plane, enabling the templates to be longitudinally closed along the needle beam through the frame clutch mechanism, and enabling the templates to form a broken line cylindrical structure adaptive to the curve section of the tunnel;
when the tunnel is a transition section of a straight line and a curve, the template at the straight line section is of a straight line cylindrical structure adaptive to the straight line section of the tunnel, and the template at the curve section is of a broken line cylindrical structure adaptive to the curve section of the tunnel;
s3, longitudinally positioning the needle beam type rotary die full-circle lining trolley
The deviation frame and the template system are rotated by the traction of a steel wire rope and are longitudinally moved to a tunnel design position along the needle beam;
s4, positioning the central line of needle beam type rotary die full-circle lining trolley
Starting the frame offset force application mechanism, and adjusting the transverse position of the rotary offset frame on the needle beam to enable the rotary offset frame to be completely centered;
s5, positioning the needle beam type rotary die full circle lining trolley by elevation
Adjusting the front support and the rear support of the needle beam, and adjusting the height of the needle beam to a designed elevation;
s6, unfolding the panel
Adjusting the template into a full circle to a design position;
s7, placing a balance weight to enable the gravity center of the needle beam type rotary die full-circle lining trolley to move downwards;
s8, end sealing of the head die, water stop belt installation and concrete pouring;
s9, advancing and positioning the needle beam
After the poured concrete is cured to reach the strength, retracting the front support and the rear support of the needle beam, bearing the weight of the template system, enabling the needle beam not to bear the weight, starting the longitudinal moving device of the needle beam to enable the needle beam to move forwards to the position of the next template, then starting the frame offset jack, adjusting the transverse position of the needle beam to enable the starting point and the ending point of the needle beam to be positioned on the central line of the tunnel, then extending the front support and the rear support of the needle beam, and enabling the needle beam to support the rotary offset frame and the template system again;
s10, demolding
S11, next cycle
Step S2-11 is repeated.
2. The shield small-radius tunnel lining construction method according to claim 1, wherein the needle beam type rotary die full circle lining trolley construction further comprises a counterweight system for applying a downward pressure to the formwork.
3. The shield small-radius tunnel lining construction method according to claim 2, wherein a traverse sliding groove is longitudinally arranged on the left side or the right side of the needle beam, and the traverse sliding groove is of a concave type with a small outside and a large inside;
the outer frame longitudinal beam positioned on the side of the transverse sliding chute is aligned with the transverse sliding chute;
the frame offset force application mechanism comprises a frame offset jack and a longitudinal sliding offset trolley;
the longitudinal sliding and shifting trolley comprises a pulley, a bottom plate and a trolley hinge lug, wherein the pulley and the trolley hinge lug are respectively arranged on two sides of the bottom plate, and the pulley is in sliding fit with the transverse sliding chute;
the outer end of the frame offset jack is fixedly connected with an outer frame longitudinal beam positioned on the outer side of the transverse sliding chute, and the inner end of the frame offset jack is hinged with a trolley hinge lug.
4. The shield small-radius tunnel lining construction method according to claim 3, wherein in each rotational offset frame, at least two inner and outer frame supports are arranged on the left and right sides of the inner frame;
the frame clutch mechanism is a frame clutch oil cylinder, and the first end of the frame clutch oil cylinder is hinged with the inner frame and the outer frame at the same side.
5. The shield small-radius tunnel lining construction method according to claim 4, wherein the rotational offset frame further comprises an external-tooth slewing bearing and a toothless slewing bearing;
the two outer frame outer rings are respectively and fixedly connected with the inner ring of the external tooth slewing bearing and the inner ring of the toothless slewing bearing;
the template is fixedly connected with the outer ring of the external tooth slewing bearing and the outer ring of the toothless slewing bearing;
the rotary driving mechanism comprises a variable frequency motor and driving teeth;
the variable frequency motor is fixed on the outer frame longitudinal beam, and an output shaft is connected with the driving teeth;
the driving teeth are meshed with a gear ring on an outer ring of the external tooth slewing bearing.
6. The shield small-radius tunnel lining construction method according to claim 5, wherein the end head template and the middle template both comprise outer molds, rotating outer rings, rotating inner rings, outer ring longitudinal beams, inner and outer ring support and stripper cylinders;
the outer mold is formed by enclosing a plurality of arc-shaped templates;
the two rotary outer rings are oppositely arranged and connected through a plurality of outer ring longitudinal beams;
the rotating inner ring is positioned in the rotating outer ring and is connected with the rotating outer ring through a plurality of inner and outer ring supports;
the two rotating inner rings are respectively and fixedly connected with the outer ring of the external tooth slewing bearing and the outer ring of the toothless slewing bearing;
two ends of the demoulding oil cylinder are respectively hinged with the arc-shaped template and the outer ring longitudinal beam.
7. The shield small-radius tunnel lining construction method according to claim 6, wherein each rotary offset frame is provided with a counterweight system, and the counterweight system comprises a counterweight block and a counterweight cylinder;
a balance weight reserved space without an outer frame longitudinal beam and an outer ring longitudinal beam is arranged right below the inner frame;
the top of counter weight hydro-cylinder is fixed in the bottom of inner frame, and the bottom is connected with the balancing weight, and counter weight hydro-cylinder and balancing weight all can pass the counter weight headspace and exert the holding down force to the template.
8. The shield small-radius tunnel lining construction method according to claim 7, wherein the outer mold comprises a top mold, a bottom mold and a side mold connecting the top mold and the bottom mold;
stiffening ribs are longitudinally arranged on the inner walls of the top die, the bottom die and the side die;
a template cross beam is arranged between the stiffening ribs of the top mold and the bottom mold, and a pumping port and a balancing weight frame for accommodating a balancing weight are arranged on a surrounding area of the stiffening ribs and the template cross beam;
a pouring window capable of being opened inwards is arranged on the side mold;
the demoulding oil cylinder comprises a top mould demoulding oil cylinder, a bottom mould demoulding oil cylinder and a side mould demoulding oil cylinder;
two ends of a top mold demolding oil cylinder are respectively hinged with a template cross beam of a top mold and an outer ring longitudinal beam positioned above the rotary inner ring;
two ends of the bottom die demoulding oil cylinder are respectively hinged with a template cross beam of the bottom die and an outer ring longitudinal beam positioned below the rotary inner ring;
two ends of the side die demoulding oil cylinder are respectively hinged with the stiffening ribs of the side die and the outer ring longitudinal beam positioned on the side surface of the rotary inner ring.
9. The shield small-radius tunnel lining construction method according to claim 1, wherein the wire rope retraction mechanism comprises a motor, a driving gear connected with an output shaft of the motor, a roller rotatably disposed in the needle beam, and a driven gear connected with the roller;
two ends of the roller are provided with rope blocks;
the axis of the driven gear is collinear with the axis of the roller, and the driven gear is meshed with the driving gear;
the middle part of the steel wire rope is fixed on the roller through a rope clamp, the steel wire rope is wound between the rope blocks on the two sides in a one-way mode, and rope buckles are arranged at the two ends of the steel wire rope;
the needle beam front support comprises a front telescopic oil cylinder and a front supporting block, and the needle beam rear support comprises a rear telescopic oil cylinder and a rear supporting block;
the front supporting block is supported on the unlined segment, and two ends of the front telescopic oil cylinder are respectively connected with the needle beam and the front supporting block;
the rear supporting block is supported on the lining concrete, and two ends of the rear telescopic oil cylinder are respectively connected with the needle beam and the rear supporting block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647443.XA CN113309541B (en) | 2021-06-10 | 2021-06-10 | Lining construction method for shield small-radius tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647443.XA CN113309541B (en) | 2021-06-10 | 2021-06-10 | Lining construction method for shield small-radius tunnel |
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| Publication Number | Publication Date |
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| CN113309541A CN113309541A (en) | 2021-08-27 |
| CN113309541B true CN113309541B (en) | 2022-04-19 |
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| CN111594228A (en) * | 2020-05-25 | 2020-08-28 | 浙江世润建创科技发展有限公司 | Lining of round water delivery tunnel steel mould trolley and construction method |
| CN112502721A (en) * | 2020-12-08 | 2021-03-16 | 中铁隧道局集团有限公司 | Arc-shaped bifurcation stepping construction method for positioning double TBMs based on double-line separate repair |
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