CN111608698A - Ultra-large-span tunnel arch lining steel bar binding bracket and method - Google Patents
Ultra-large-span tunnel arch lining steel bar binding bracket and method Download PDFInfo
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- CN111608698A CN111608698A CN202010467892.1A CN202010467892A CN111608698A CN 111608698 A CN111608698 A CN 111608698A CN 202010467892 A CN202010467892 A CN 202010467892A CN 111608698 A CN111608698 A CN 111608698A
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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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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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
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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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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Abstract
The invention discloses a binding support and a binding method for a lining steel bar of an arch part of a super-large span tunnel, which comprises a rack, wherein the top of the rack is provided with a binding platform through a jacking device; a plurality of longitudinal steel bar positioning clamps are arranged on the binding platform; a first annular reinforcing steel bar fixture and a second annular reinforcing steel bar fixture are respectively arranged on the binding platform; the front end of the binding platform is also provided with a steel bar feeding mechanism; according to the invention, the longitudinal steel bars and the circumferential steel bars are positioned by the first circumferential steel bar fixture and the second circumferential steel bar fixture of the longitudinal steel bar positioning fixture, the feeding of the steel bars is realized by the steel bar feeding mechanism, the feeding and the positioning of the steel bars can be rapidly completed, the lifting and the fixing of the three-dimensional steel bar net after being bound can be realized by the jacking device, an effective means is provided for the fixing of the three-dimensional steel bar net, and the binding speed of the steel bars at the arch part of the tunnel is further improved.
Description
Technical Field
The invention belongs to the technical field of tunnel and underground engineering construction, and particularly relates to a super-large-span tunnel arch lining steel bar binding support and a method.
Background
With the development of national economy and the continuous progress of science and technology, super-large-span tunnels and underground engineering gradually emerge. The lining of reinforced concrete is an important supporting structure in tunnel and underground engineering, and the binding of reinforcing steel bars is a conventional process in lining construction. The reinforcing mesh in the lining structure usually consists of an inner layer main rib, an outer layer main rib and a middle transverse and longitudinal connecting rib, and the reinforcing mesh is criss-cross to form a three-dimensional mesh structure. The reinforcing bars are usually required to be segmented and bound one by one, and the binding quality is the basis for determining the construction quality of the two-lined reinforced concrete and plays a crucial role in the service life of the tunnel.
The common railway tunnel lining reinforcing steel bar hoop length generally is about 30m, and radial (be for the direction by tunnel axis outdiffusion) is individual layer or double-deck reinforcing bar usually, and reinforcing bar net quality is less, and reinforcing bar net thickness is also not big (no more than 30cm), and the ligature degree of difficulty is little, generally relies on reinforcement bar ligature operation rack, and the workman can directly stand and carry out the ligature on the platform, and the ligature is firm can satisfy the operation requirement.
However, the circumferential length of the tunnel lining reinforcing steel bar with the oversized section can approach 100m, multiple layers of reinforcing steel bars need to be bound in the radial direction, the thickness of the reinforcing steel bar mesh is very large (exceeding 100cm), and the traditional reinforcing steel bar binding operation rack cannot meet the binding of a complete reinforcing steel bar three-dimensional mesh.
Disclosure of Invention
The invention aims to provide a lining steel bar binding bracket and a lining steel bar binding method for an arch part of a super-large span tunnel, so as to realize the positioning of steel bars to be bound and further improve the binding speed of the steel bars.
The invention adopts the following technical scheme: a lining steel bar binding bracket for an arch part of an ultra-large span tunnel comprises a rack, wherein a binding platform is arranged at the top of the rack through a jacking device;
the binding platform is provided with a plurality of longitudinal steel bar positioning clamps, each longitudinal steel bar positioning clamp is provided with a plurality of notches for clamping longitudinal steel bars, and each longitudinal steel bar positioning clamp is transverse and extends from one side wall of the tunnel to the other side wall of the tunnel; the longitudinal steel bar positioning clamps are distributed in parallel along the axis direction of the tunnel;
a first annular reinforcing steel bar fixture and a second annular reinforcing steel bar fixture are respectively arranged on the binding platform; the first annular steel bar clamp and the second annular steel bar clamp are both provided with clamping grooves for clamping annular steel bars;
the front end of the binding platform is also provided with a steel bar feeding mechanism, and the steel bar feeding mechanism is used for hoisting longitudinal steel bars, annular steel bars and radial steel bars to the binding platform.
Furthermore, the longitudinal steel bar positioning clamp comprises an arc-shaped plate, and the shape of the arc-shaped plate is consistent with that of the tunnel arch;
the web plate is arranged on the arc plate, the web plate extends from one end of the arc plate to the other end of the arc plate, gaps are arranged at the upper end of the web plate at intervals, and each gap is used for positioning the longitudinal steel bar.
Furthermore, the section of the notch is semicircular, and the radius of the semicircular is equal to that of the longitudinal steel bar.
Furthermore, first hoop reinforcing bar fixture fixed mounting is in the rear end of ligature platform, and the second is to reinforcing bar fixture movable mounting on the ligature platform, and first hoop reinforcing bar fixture and the second is to reinforcing bar fixture's locating surface setting relatively, and the interval is provided with a plurality of draw-in grooves about the locating surface.
Further, reinforcing bar feed mechanism includes reinforcing bar hoist and reinforcing bar storage hopper, and the reinforcing bar hoist setting is connected to the reinforcing bar storage hopper through the lifting rope at the front end of ligature platform to drive the reinforcing bar storage hopper and rise or fall.
Furthermore, the steel bar lifting appliance comprises a lifting appliance support arranged on the binding platform, a driving roller, a first fixed pulley and a second fixed pulley are arranged on the lifting appliance support, a lifting rope is arranged on the driving roller, and the lifting rope is connected to the steel bar storage hopper after sequentially passing through the first fixed pulley and the second fixed pulley.
Further, the top of the rack is in a step shape with a high middle and two low sides.
Further, the ligating platform includes a flat plate provided on each step of the stepped stage.
Furthermore, a plurality of positioning points are arranged on each flat plate at intervals along the axial direction of the tunnel.
The other technical scheme of the invention is as follows: a method for binding arch lining reinforcing steel bars of an ultra-large span tunnel uses the arch lining reinforcing steel bar binding bracket of the ultra-large span tunnel, and specifically comprises the following steps:
assembling the lining steel bar binding bracket of the arch part of the super-large span tunnel to enable the jacking device to be in a falling state;
hoisting the steel bars to be bound through a steel bar feeding mechanism;
placing a plurality of sections of longitudinal steel bars on a longitudinal steel bar positioning fixture, and binding the heads and the tails of two adjacent sections of longitudinal steel bars;
placing a plurality of sections of circumferential reinforcing steel bars on a first circumferential reinforcing steel bar fixture in a layered mode, binding the head and the tail of two adjacent sections of circumferential reinforcing steel bars on the same layer, and binding radial reinforcing steel bars on longitudinal reinforcing steel bars and the circumferential reinforcing steel bars;
sequentially binding the rest circumferential reinforcing steel bars through a second circumferential reinforcing steel bar fixture, and binding radial reinforcing steel bars on the longitudinal reinforcing steel bars and the circumferential reinforcing steel bars; (ii) a
And binding the top longitudinal steel bars on the top circumferential steel bars and the upper end parts of the radial steel bars to form a steel bar three-dimensional net.
The invention has the beneficial effects that: according to the invention, the longitudinal steel bars and the circumferential steel bars are positioned by the longitudinal steel bar positioning clamp, the first circumferential steel bar clamp and the second circumferential steel bar clamp, the steel bars are fed by the steel bar feeding mechanism, the feeding and the positioning of the steel bars can be rapidly completed, the lifting and the fixing of the bound three-dimensional steel bar net can be realized by the jacking device, an effective means is provided for the fixing of the three-dimensional steel bar net, and the binding speed of the steel bars at the arch part of the tunnel is further improved.
Drawings
FIG. 1 is a schematic axial side view of a stent according to an embodiment of the present invention;
FIG. 2 is a schematic front view of a bracket according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 1;
FIG. 4 is a schematic view of the longitudinal rebar positioning fixture in an embodiment of the invention;
FIG. 5 is a partial enlarged view of portion B of FIG. 4;
FIG. 6 is a schematic structural view of a circumferential reinforcing bar positioning fixture according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a steel bar spreader in an embodiment of the invention.
Wherein: 1. a rack; 2. binding a platform; 3. a steel bar storage hopper; 4. a steel bar sling; 5. a longitudinal steel bar positioning clamp; 6. a first hoop reinforcing steel bar positioning clamp; 7. a second circumferential reinforcing steel bar positioning clamp; 8. circumferential reinforcing steel bars; 9. longitudinal reinforcing steel bars; 10. a jacking device; 11. hoisting an anchor; 12. tunnel surrounding rock;
41. a drive roller; 42. a lifting rope; 43. a first fixed pulley; 44. a hook; 45. a hanger bracket; 46. a second fixed pulley;
51. an arc-shaped plate; 52. a rib plate; 53. a web; 54. a notch;
61. a base plate; 62. a rib plate; 63. a panel; 64. a clamping groove.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a lining steel bar binding bracket for an arch part of a super-large span tunnel, which comprises a rack 1, wherein a binding platform 2 is arranged at the top of the rack 1 through a jacking device 10; a plurality of longitudinal steel bar positioning clamps 5 are arranged on the binding platform 2, a plurality of notches 54 for clamping longitudinal steel bars are formed in each longitudinal steel bar positioning clamp 5, and each longitudinal steel bar positioning clamp 5 is transverse and extends from one side wall of the tunnel to the other side wall of the tunnel; the longitudinal steel bar positioning clamps 5 are distributed in parallel along the axis direction of the tunnel; a first annular reinforcing steel bar clamp 6 and a second annular reinforcing steel bar clamp 7 are respectively arranged on the binding platform 2; the first annular reinforcing steel bar clamp 6 and the second annular reinforcing steel bar clamp 7 are both provided with clamping grooves 64 for clamping annular reinforcing steel bars; the front end of the binding platform 2 is also provided with a steel bar feeding mechanism, and the steel bar feeding mechanism is used for hoisting longitudinal steel bars, annular steel bars and radial steel bars to the binding platform 2.
In the embodiment, the binding amount of the steel bars in each cycle is large, the positioning precision is high, and the difficulty of the binding process is multiplied. Meanwhile, as the tunnel span is overlarge and needs to be lined in time to meet the supporting requirement, the extremely harsh requirement is provided for rapid reinforcement binding, the binding process is innovated, and the requirements of clear labor division, coordinated steps and shortest time consumption in the whole process from single reinforcement transportation to three-dimensional net forming are met. In addition, for the convenience of description of the embodiment, the axial direction of the tunnel is described as the longitudinal direction of the tunnel, the front end is near the mouth of the tunnel, and the rear end is near the inside of the tunnel; setting the cross section direction of the tunnel as the circumferential direction, wherein one side wall is the left side, and the other side wall is the right side; the radial direction is from the axle center of the cross section of the tunnel to the radiation direction of the arch part, the side wall and the bottom plate of the tunnel.
According to the invention, the longitudinal steel bars and the circumferential steel bars are positioned by the longitudinal steel bar positioning clamp, the first circumferential steel bar clamp and the second circumferential steel bar clamp, the steel bars are fed by the steel bar feeding mechanism, the feeding and the positioning of the steel bars can be rapidly completed, the lifting and the fixing of the bound three-dimensional steel bar net can be realized by the jacking device, an effective means is provided for the fixing of the three-dimensional steel bar net, and the binding speed of the steel bars at the arch part of the tunnel is further improved.
The rack 1 is the operation rack that sets up at tunnel lining reinforcement section, and it is formed by common shaped steel welding, belongs to the basic component of whole support, places subaerial, and longitudinal length satisfies the length demand that reinforcement circulates at every turn, and its horizontal width satisfies reinforcement super large-span demand, please the top be the notch cuttype according to the tunnel cross section arch height and arrange, and the step form that the high both sides are low in the middle of the top of rack 1 is promptly.
In order to realize the movement of the gantry 1 more quickly, a rail may be installed in the tunnel, and a slider or a roller may be installed at the bottom of the gantry 1 to move relative to the rail.
The jacking device 10 is installed at the top of the platform 1, specifically is a lifting device, and specifically can select a hydraulic oil cylinder or a jack. Because jacking device 10 is for supporting ligature platform 2, to the tunnel of super large span (the span exceeds 70m), the area of ligature platform 2 is very big, and weight is also very big, consequently, in order to realize the lift and the equilibrium of ligature platform 2, a plurality of jacking devices have been arranged along the transverse width direction of rack 1, two jacking devices 10 have been arranged along the longitudinal direction of rack 1, and, set up a plurality of jacking devices 10 into the linkage, unified control. The steel bar three-dimensional net is lifted by the jacking device 10 and is connected with the hanging anchor 11 on the tunnel surrounding rock 12, and two ends of the steel bar three-dimensional net are connected with the steel bar three-dimensional net of the side wall.
The binding platform 2 is formed by welding common section steel and steel plates, is arranged in a stepped manner according to the section of the tunnel, and can cover the whole reinforcement binding area by the longitudinal and transverse sizes. Specifically, the ligating platform 2 includes a flat plate provided on each step of the stepped stage 1.
To tunnel lining's reinforcement problem, need lay the longitudinal reinforcement 9 parallel with the tunnel axis, still need lay the hoop reinforcing bar 8 that is located the tunnel transverse section and is unanimous with the arch portion shape to, to super large span tunnel, because the span is too big, so need the holding power to be exponential increase, consequently, the thickness of lining far exceeds conventional tunnel lining's thickness. Then, when the reinforcing steel bars are bound, multiple layers of circumferential reinforcing steel bars 8 need to be bound so as to adapt to the tunnel lining with large thickness. In this embodiment, as shown in fig. 3, 5 layers of circumferential reinforcing steel bars are bound, the distance between two adjacent layers of circumferential reinforcing steel bars 8 is equal, and is 20-30 cm, and the overall thickness of the bound three-dimensional net of reinforcing steel bars exceeds 1m, and the work is difficult to complete only by means of the arms of workers.
Therefore, a plurality of longitudinal reinforcing steel bar positioning clamps 5 are arranged on the binding platform 2. Specifically, the longitudinal steel bar positioning fixture 5 comprises an arc-shaped plate 51, and the arc-shaped plate 51 is detachably connected with the binding platform 2. The arc-shaped plate 51 is consistent with the shape of the tunnel arch; and further keep the distance between each longitudinal steel bar 9 and the vault equal, increase the intensity of the three-dimensional net of steel bars.
As shown in fig. 4 and 5, a web plate 53 is provided on the arc plate 51, the web plate 53 extends from one end of the arc plate 51 to the other end, and is provided perpendicular to the arc plate 51, so that the vertical supporting force of the web plate 53 can be increased, and notches 54 are provided at intervals at the upper end of the web plate 53, each notch 54 is used for positioning a longitudinal steel bar. The length of the arc-shaped plate 51 between two adjacent notches 54 is the same as the engineering design requirement, so that the strength between the adjacent longitudinal reinforcing steel bars 9 can be ensured. For increased strength, a rib 52 is provided between the arc plate 51 and the web 53.
Every longitudinal reinforcement location fixture 5 all installs on ligature platform 2 to, distribute along the tunnel axis direction and install a plurality ofly, arbitrary two longitudinal reinforcement location fixtures 5 are all parallel to each other, and to this longitudinal reinforcement location fixture 5's quantity, can be according to the length of this ligature section, according to the specific settlement of engineering design requirement.
Optionally, for the ligature and the location of longitudinal reinforcement 9, the cross-section of breach 54 is semi-circular, and semi-circular radius equals with the radius of longitudinal reinforcement, so, can make longitudinal reinforcement 9 can effectual placing inside breach 54, can not too high or low excessively, and then realize the horizontal location of longitudinal reinforcement 9.
As an optional realization form, in order to realize the ligature of hoop reinforcing bar 8 in the three-dimensional net of reinforcing bar, still be equipped with first hoop reinforcing bar fixture 6 and the second hoop reinforcing bar fixture 7 respectively on the ligature platform, the two is for the ligature of hoop reinforcing bar 8, first hoop reinforcing bar fixture 6 is fixed mounting in the rear end of ligature platform 2, the rear end of realizing the three-dimensional net of reinforcing bar is fixed, second hoop reinforcing bar fixture 7 can be on ligature platform 2 removal, it is different according to the mounted position of hoop reinforcing bar 8, can set up the different positions at ligature platform 2.
Preferably, the second circumferential reinforcing bar fixture 7 is installed at the installation position of the circumferential reinforcing bar 8 closest to the rear end of the three-dimensional net of reinforcing bars, and after the circumferential reinforcing bar 8 at the position is bound, the second circumferential reinforcing bar fixture moves to the front end of the three-dimensional net of reinforcing bars in sequence until the binding of the circumferential reinforcing bar of the three-dimensional net of reinforcing bars is completed. When the steel bar reinforcing device is installed, a second circumferential steel bar fixture 7 and a first circumferential steel bar fixture 6 are correspondingly arranged at corresponding positions of each longitudinal steel bar 9.
As shown in fig. 3, the first circumferential reinforcing bar fixture 6 and the second circumferential reinforcing bar fixture 7 have the same structure, the positioning surfaces of the first circumferential reinforcing bar fixture 6 and the second circumferential reinforcing bar fixture 7 are arranged oppositely, and a plurality of clamping grooves 64 are arranged on the positioning surfaces at intervals from top to bottom.
In the present embodiment, the first hoop reinforcing bar fixture 6 is mainly described as an example. As shown in fig. 6, specifically, the first hoop reinforcement bar fixture 6 mainly includes a bottom plate 61, and the bottom plate 61 is a flat plate and is detachably connected to the top surface of the lashing platform 2. The end of the flat plate is connected with a panel 63, the panel 63 is perpendicular to the binding platform 2, one surface of the panel is a positioning surface, a plurality of clamping grooves 64 are arranged on the positioning surface at intervals from top to bottom, each clamping groove 64 is used for accommodating one part of the circumferential steel bars 8, the circumferential steel bars 8 are clamped in the clamping grooves, and then the circumferential steel bars 8 on the layer can be positioned by the clamping grooves 64 on the same layer on the first circumferential steel bar clamping devices 6. As a specific implementation form, in this embodiment, the slot is specifically L-shaped, and forms the slot 64 together with the positioning surface, and the number and the interval of the slots 64 can be determined according to the number of layers and the distance of layers of the steel bar binding.
First hoop reinforcing bar fixture 6 is fixed at the rear end of ligature platform 2, can fix a position the initial position of the three-dimensional net of reinforcing bar through this first hoop reinforcing bar fixture 6, can also support the reinforcing bar net piece of ligature in-process, prevents that the reinforcing bar net piece of ligature in-process from empting.
In addition, because the second circumferential reinforcement fixture 7 moves on the binding platform 2, in order to facilitate the convenience of movement, the other binding platforms 2 can be connected through bolts and can also be connected through guide rails, and then the progress of reinforcement is accelerated. Moreover, in order to guarantee the positioning accuracy of the second annular reinforcing steel bar fixture 7, a plurality of positioning points are arranged on each flat plate of the binding platform 2 at intervals along the axis direction of the tunnel and used for positioning during annular reinforcing steel bar binding, the positioning points can also be made into threaded holes, and then the second annular reinforcing steel bar fixture 7 can be conveniently connected and detached.
It should be understood that, at the ligature in-process of the three-dimensional net of reinforcing bar, it is timely to realize the reinforcing bar feed, avoids influencing the reinforcement progress, consequently, is provided with reinforcing bar feed mechanism at the front end of ligature platform 2, and this reinforcing bar feed mechanism can be used to lift by crane longitudinal reinforcement, hoop reinforcing bar and radial reinforcing bar to ligature platform 2 fast on.
As a possible implementation mode, the steel bar feeding mechanism comprises a steel bar lifting tool 4 and a steel bar storage hopper 3, the steel bar lifting tool 4 is arranged at the front end of the binding platform 2, and is connected to the steel bar storage hopper 3 through a lifting rope 42 so as to drive the steel bar storage hopper 3 to rise or fall.
More specifically, as shown in fig. 7, the steel bar spreader 4 includes a spreader bracket 45 installed on the binding platform 2, a driving roller 41, a first fixed pulley 43 and a second fixed pulley 46 are provided on the spreader bracket 45, a lifting rope 42 is installed on the driving roller 41, and the lifting rope 42 sequentially passes through the first fixed pulley 43 and the second fixed pulley 46 and then is connected to the steel bar storage hopper 3. The hanger bracket 45 includes a bottom plate, a vertical plate and a top plate, which form a zigzag structure, and the vertical plate is vertical. The driving roller 41 is arranged above the bottom plate, the first fixed pulley 43 is arranged at the top of the vertical plate, the second fixed pulley 46 is arranged at the front end of the top plate, the lifting rope 42 is specifically a steel wire rope, one end of the lifting rope is fixed on the driving roller 41, and the other end of the lifting rope sequentially passes through the first fixed pulley 43 and the second fixed pulley 46 and then is connected to the steel bar storage hopper 3. Optionally, for convenient connection, a lifting hook 44 may be installed at the end of the steel wire rope, and a lifting ring is disposed on the steel storage hopper 3.
Due to the adoption of the technical scheme, the invention has the following positive effects:
1. the invention can realize clear division of labor and coordinated and ordered promotion of steps in the binding operation of the multilayer steel bar three-dimensional net for the tunnel lining with the oversized section, and solves the technical problem of difficult binding construction organization of the multilayer steel bar three-dimensional net under the tunnel construction condition.
2. The invention can solve the problem that the multilayer reinforcing steel bars of the tunnel lining with the oversized section are difficult to position, can realize the simultaneous positioning of the multilayer reinforcing steel bars, and has the advantages of simple and convenient operation, high positioning precision and low use cost.
3. The invention realizes the synchronous binding of the multilayer reinforced three-dimensional net of the tunnel lining with the oversized section, the positioning and binding processes of a plurality of reinforced bars can be synchronously carried out, the construction efficiency of the reinforced bar binding of the multilayer reinforced three-dimensional net of the tunnel lining with the oversized section is obviously improved, the binding time of the reinforced bar net in each cycle is shortened, and the precondition is created for the rapid construction of the tunnel lining with the oversized section.
4. The invention can also be used for other underground engineering and the construction requirement of oversized caverns, and provides efficient and reliable construction equipment and process for binding the multilayer lining reinforcing steel bar three-dimensional net.
The invention also discloses a method for binding the arch lining reinforcing steel bars of the ultra-large span tunnel, which uses the binding support for the arch lining reinforcing steel bars of the ultra-large span tunnel and specifically comprises the following steps:
before the binding construction of the multilayer steel bar three-dimensional net of the tunnel lining with the oversized section, the binding support of the lining steel bar of the arch part of the tunnel with the oversized span is assembled, so that the jacking device 10 is in a falling state. The steel bar binding support is moved to a tunnel lining steel bar three-dimensional net binding station, the steel bar binding operation rack is checked and ensured to be positioned accurately and connected reliably at all parts, and the steel bar binding operation rack is in a good working state, and meanwhile, the jacking device is ensured to be in a state of contracting to the lowest. And the tunnel surrounding rock is completely anchored.
When the oversized section tunnel lining multi-layer steel bar three-dimensional net binding construction is carried out, a steel bar feeding mechanism is used for hoisting steel bars to be bound to the binding platform 2; so that the longitudinal steel bars 9, the circumferential steel bars 8, the radial steel bars and the longitudinal connecting bars below the steel bar lifting appliance 4 are hoisted into the corresponding steel bar storage hoppers 3 in batches.
The worker takes out the longitudinal steel bars 9, places the multiple sections of longitudinal steel bars 9 on the longitudinal steel bar positioning clamps 5, specifically prevents the longitudinal steel bars 9 from being positioned on the notches 54, and binds the heads and the tails of the two adjacent sections of longitudinal steel bars 9. The multi-section annular reinforcing steel bars 8 are placed on the first annular reinforcing steel bar fixture 6 in a layered mode, specifically on the clamping grooves 64, the heads and the tails of two adjacent sections of annular reinforcing steel bars on the same layer are bound, radial reinforcing steel bars are bound on the longitudinal reinforcing steel bars 9 and the annular reinforcing steel bars 8, and the longitudinal reinforcing steel bars 9, the transverse reinforcing steel bars 8 and the radial reinforcing steel bars on the cross section of the tunnel form a reinforcing steel bar mesh. .
And binding the circumferential steel bars 8 at the next positioning point through a second circumferential steel bar fixture 7, and binding radial steel bars on the longitudinal steel bars 9 and the circumferential steel bars 8. And then binding longitudinal connecting ribs between the adjacent reinforcing mesh sheets to ensure that the adjacent reinforcing mesh sheets are firmly connected.
After the binding work is finished, all the steel bar net pieces are bound, the top of the steel bar three-dimensional net still has enough operation space, finally, the steel bar three-dimensional net is used as an operation platform, workers go up to the operation platform, and bind the longitudinal steel bars 9 on the top layer annular steel bars 8 and the upper end parts of the radial steel bars to form the final steel bar three-dimensional net.
In the binding process, the longitudinal steel bars and the circumferential steel bars at different stations can be synchronously arranged. After the binding of the multilayer steel bar three-dimensional net of the tunnel lining with the oversized section is finished, the first annular steel bar positioning fixture 6 and the second annular steel bar positioning fixture 7 at the front end and the rear end of the binding platform are removed, then the jacking device 10 is driven synchronously, and the steel bar three-dimensional net which is finished by binding is moved in the whole radial direction to the designed position. And fixing the finished steel bar three-dimensional net by using a hanging anchor 11, connecting the finished steel bar three-dimensional net with the previous circulating steel bar three-dimensional net, and butting the lining side wall connecting reinforcing steel bars of the circulating steel bar binding station. And finally, synchronously driving the jacking device 10 to reduce the whole binding platform to the lowest state, so that the circulating oversized section tunnel lining steel bar three-dimensional net completes binding construction. The reinforcement operation rack can move to the next reinforcement cycle.
Claims (10)
1. A lining steel bar binding bracket for an arch part of a super-large span tunnel is characterized by comprising a rack (1), wherein a binding platform (2) is arranged at the top of the rack (1) through a jacking device (10);
the binding platform (2) is provided with a plurality of longitudinal steel bar positioning clamps (5), each longitudinal steel bar positioning clamp (5) is provided with a plurality of notches (54) for clamping longitudinal steel bars, and each longitudinal steel bar positioning clamp (5) is transverse and extends from one side wall of the tunnel to the other side wall of the tunnel; the longitudinal steel bar positioning clamps (5) are distributed in parallel along the axis direction of the tunnel;
a first annular reinforcing steel bar fixture (6) and a second annular reinforcing steel bar fixture (7) are respectively arranged on the binding platform (2); the first annular steel bar clamp (6) and the second annular steel bar clamp (7) are both provided with clamping grooves (64) for clamping annular steel bars;
the front end of the binding platform (2) is further provided with a steel bar feeding mechanism, and the steel bar feeding mechanism is used for hoisting the longitudinal steel bars, the annular steel bars and the radial steel bars to the binding platform (2).
2. The extra-large span tunnel arch lining steel reinforcement binding bracket of claim 1, characterized in that the longitudinal steel reinforcement positioning fixture (5) comprises an arc-shaped plate (51), and the arc-shaped plate (51) is in accordance with the shape of the tunnel arch;
the arc-shaped plate (51) is provided with a web plate (53), the web plate (53) extends from one end of the arc-shaped plate (51) to the other end, the upper end of the web plate is provided with the notches (54) at intervals, and each notch (54) is used for positioning the longitudinal steel bar.
3. The extra-large span tunnel arch lining rebar tying bracket of claim 2, wherein the cross section of the notch (54) is a semicircle, and the radius of the semicircle is equal to the radius of the longitudinal rebar.
4. The extra-large span tunnel arch lining steel bar binding bracket according to claim 2 or 3, wherein the first circumferential steel bar clamp (6) is fixedly arranged at the rear end of the binding platform (2), the second circumferential steel bar clamp (7) is movably arranged on the binding platform (2), positioning surfaces of the first circumferential steel bar clamp (6) and the second circumferential steel bar clamp (7) are oppositely arranged, and a plurality of clamping grooves (64) are arranged on the positioning surfaces at intervals from top to bottom.
5. The extra-large span tunnel arch lining steel bar binding bracket according to claim 4, wherein the steel bar feeding mechanism comprises a steel bar lifting appliance (4) and a steel bar storage hopper (3), the steel bar lifting appliance (4) is arranged at the front end of the binding platform (2) and is connected to the steel bar storage hopper (3) through a lifting rope (42) so as to drive the steel bar storage hopper (3) to rise or fall.
6. The extra-large span tunnel arch lining steel bar binding support according to claim 5, wherein the steel bar hanger (4) comprises a hanger support (45) installed on the binding platform (2), the hanger support (45) is provided with a driving roller (41), a first fixed pulley (43) and a second fixed pulley (46), the driving roller (41) is provided with a lifting rope (42), and the lifting rope (42) is connected to the steel bar storage hopper (3) after sequentially passing through the first fixed pulley (43) and the second fixed pulley (46).
7. The extra-large span tunnel arch lining steel bar lashing support according to claim 1, wherein the top of the rack (1) is stepped with a high middle and low two sides.
8. The extra-large span tunnel arch lining steel reinforcement lashing bracket of claim 1 or 6, characterized in that the lashing platform (2) comprises a flat plate disposed on each step of the stepped rack (1).
9. The extra-large span tunnel arch lining steel reinforcement binding bracket of claim 8, wherein a plurality of positioning points are arranged on each flat plate at intervals along the tunnel axis direction.
10. A method for binding arch lining reinforcing steel bars of a super-large span tunnel is characterized in that the extra-large span tunnel arch lining reinforcing steel bar binding support disclosed by any one of claims 1 to 9 is used, and the method specifically comprises the following steps:
assembling the arch lining steel bar binding bracket of the ultra-large span tunnel, and enabling the jacking device (10) to be in a falling state;
hoisting the steel bars to be bound by the steel bar feeding mechanism;
placing a plurality of sections of longitudinal steel bars (9) on the longitudinal steel bar positioning fixture (5), and binding the heads and the tails of two adjacent sections of longitudinal steel bars (9);
placing a plurality of sections of circumferential reinforcing steel bars (8) on a first circumferential reinforcing steel bar fixture (6) in a layered manner, binding the head and the tail of two adjacent sections of circumferential reinforcing steel bars (8) on the same layer, and binding radial reinforcing steel bars on the longitudinal reinforcing steel bars (9) and the circumferential reinforcing steel bars (8);
sequentially binding the rest circumferential steel bars (8) through a second circumferential steel bar fixture (7), and binding radial steel bars on the longitudinal steel bars (9) and the circumferential steel bars (8); (ii) a
And binding the top longitudinal steel bars (9) on the top layer on the annular steel bars (8) and the upper end parts of the radial steel bars to form a steel bar three-dimensional net.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113236295A (en) * | 2021-04-25 | 2021-08-10 | 中铁二局第二工程有限公司 | Construction method of intensive tunnel embedded channel |
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