CN217421172U

CN217421172U - TBM originating counter force structure for small-diameter originating hole

Info

Publication number: CN217421172U
Application number: CN202221129118.0U
Authority: CN
Inventors: 李威振; 魏世权; 王双; 杜广召; 陈正府
Original assignee: China Railway 11th Bureau Group Co Ltd; China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Current assignee: China Railway 11th Bureau Group Co Ltd; China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-09-13
Anticipated expiration: 2032-05-10

Abstract

The utility model provides a TBM counter-force structure of originating that is used for minor diameter hole of originating. The counter-force structure comprises a two-lining structure, a starting guide platform, a reference ring connected to the tail end of a negative ring duct piece of the shield tunneling machine, a circle of positioning support welded along the outer circumference of the reference ring, a circle of inclined support distributed on the ring surface of one end, far away from the negative ring duct piece, of the reference ring, and a concrete stop beam poured in the range of 45 degrees at the positive lower part of the end, far away from the negative ring duct piece, of the reference ring; the other end of the positioning support corresponding to the starting guide platform is welded with a first embedded steel plate arranged on the starting guide platform, and the other ends of the other positioning supports are welded with a second embedded steel plate arranged on the second lining structure; the other end of the inclined support is welded with a third embedded steel plate arranged on the two lining structures; the height of the concrete retaining beam is higher than the inner ring surface of the reference ring, and a plurality of steel bars are implanted at the bottom of the concrete retaining beam. The utility model discloses bulk strength is high, can provide enough big counter-force and start away TBM, and single component specification is less, and the installation is convenient.

Description

TBM originating counter force structure for small-diameter originating hole

Technical Field

The utility model relates to a shield constructs construction field, in particular to a TBM counter-force structure of originating that is used for minor diameter to originate hole.

Background

In recent years, in the field of tunnel construction, a full-face tunneling method is gradually applied to tunnel engineering due to the outstanding advantages of safer construction, fast construction progress, strong deformation control capability and the like. The full face tunneling method can be used for construction under different surrounding rock environments, generally speaking, the shield tunneling method can be used for construction under a soft rock environment, and the TBM method can be used for construction in hard rock. No matter the shield machine or the TBM is adopted for excavation construction, an initial reaction frame structure is required to be arranged to restrain initial segment displacement and provide enough attack force for the development machine in the starting stage of the development machine, and the development machine can be orderly developed forwards.

At present, no matter whether the reaction frame starts from the outside of a hole or the inside of the hole, the reaction frame adopts a square or round integral structure combined by steel beams, and is provided with a large-size inclined strut or a horizontal support to transmit the reaction force to the ground or a vertical wall, the structure is heavy, consumes more steel, occupies large space and is inconvenient to install, but when the TBM starts from a hole with a small diameter, the conventional reaction frame cannot be installed in a hidden dug secondary lining hole because the size of a primary beam and a secondary beam is too large. In addition, the existing reaction frame needs a large steel beam to be combined and welded, the cost and the manufacturing cost are high, the dismantling process is troublesome after construction, and improvement is needed urgently.

Disclosure of Invention

The utility model discloses a not enough a TBM who is used for the minor diameter to originate the hole counter-force structure that originates is provided according to prior art, and this counter-force structure can solve the minor diameter and originate the counter-force installation in hole, for the shield constructs to originate provides enough big counter-force.

In order to solve the above technical problem, the utility model provides a TBM that is used for small diameter to originate hole originates counterforce structure, be equipped with two lining structures in the hole of originating, be equipped with the guide platform of originating in the bottom of the hole of originating, its characterized in that: the counter-force structure comprises a reference ring connected to the tail end of a negative ring duct piece of the shield tunneling machine, a circle of positioning support welded along the outer circumference of the reference ring, a circle of inclined support distributed on the ring surface of one end, far away from the negative ring duct piece, of the reference ring, and a concrete stop beam poured in a range of 45 degrees at the position, far away from the positive lower part of the end of the negative ring duct piece, of the reference ring; the positioning supports are radially and equidistantly distributed along the outer circumference of the reference ring, the other end of the positioning support corresponding to the starting guide platform is welded with a first embedded steel plate arranged on the starting guide platform, and the other ends of the other positioning supports are welded with a second embedded steel plate arranged on the second lining structure; the inclined struts are distributed in the area, without the concrete stop beam, outside the reference ring, and the other end of each inclined strut is welded with a third embedded steel plate arranged on the second lining structure; the height of concrete breast board is higher than the interior anchor ring of reference ring, and implants many reinforcing bars in concrete breast board bottom, the degree of depth of bottom plate is implanted to the reinforcing bar lower extreme is 20cm at least.

The utility model discloses better technical scheme: the second embedded steel plate and the third embedded steel plate are anchored into a whole through chemical expansion bolts and two lining structures, a plurality of chemical expansion bolts are distributed on each steel plate and are equidistantly distributed at positions close to edges of the steel plates, each chemical expansion bolt is driven into the steel plates after holes are drilled on the two lining structures, and the driving depth is 20-23 cm.

The utility model discloses better technical scheme: and two ends of the inclined support are provided with 45-degree welding inclined planes.

The utility model discloses better technical scheme: and the adjacent second embedded steel plates and the adjacent third embedded steel plates are embedded at an included angle of 18 degrees.

The utility model discloses better technical scheme: the pouring height of the concrete retaining beam is 950-1000 mm, the width of the concrete retaining beam is 750-850 mm, two rows of 750-850C 22 reinforcing steel bars are implanted into the bottom of the concrete retaining beam, and the depth of an implanted bottom plate of each reinforcing steel bar is 200 mm.

The technical effects of the utility model:

(1) the utility model discloses a mode of reaction frame in the hole has reduced a large amount of negative rings installation work to avoided because of the negative rings overlength, the negative rings that arouses are oval become, the not enough scheduling problem of rigidity, thereby cause positive ring section of jurisdiction oval become, the difficult quality problems such as adjustment of TBM gesture.

(2) The utility model discloses a mode of benchmark ring and bracing, the benchmark ring is fixed at shield constructs quick-witted burden ring segment tail end, the benchmark ring is fixed on the pre-buried steel sheet in the hole through many shaped steel all around, and provide the shield through the round bracing and construct the counter-force of originating, this counter-force structure is along with the shield body in the hole of sliding together, rethread hand-pull block slightly adjusts the reaction frame, whole process operation is simple, the risk is lower, counter-force structure is fixed with it through pre-buried steel sheet in the hole, can provide enough big counter-force and originate away TBM.

(3) When the TBM starts, the lower thrust is greater than the upper thrust, and if the reaction frame is unstable or deformed and damaged, the lower thrust is generally generated on the lower structure of the reaction frame; in order to further ensure the safety of reaction frame, the utility model discloses pour the concrete fender beam that highly surpasss the height of benchmark ring lower part at the 45 within ranges of the positive lower part of benchmark ring to strengthen the structural strength of reaction frame lower part, and implant two rows of C22 reinforcing bars in fender beam bottom, further strengthen the intensity of concrete fender beam.

(4) The reference ring of the utility model is fixed in two ways, the first way is the radial direction of the reference ring, which ensures that the reference ring can be stable and does not generate radial displacement when the reaction frame provides starting reaction force; the second way is that the reaction frame diagonal brace is installed, and two ends of the H-shaped steel are processed into 45-degree inclined planes in advance, so that the diagonal brace is ensured to be fully welded with a steel plate anchored on the two lining structures.

(5) The pre-buried steel plate of the utility model is anchored on the secondary lining structure by adopting a chemical expansion screw, so that the steel plate and the concrete structure form a whole; the chemical expansion bolt is driven into the two-lining structure, so that the steel plate is fixed more firmly, and the stability of the radial support and the inclined support after welding is ensured.

The utility model discloses a counter-force structure's bulk strength is high, can provide enough big counter-force and start away TBM, and single component specification is less relatively, and the installation is convenient, can popularize and apply subway shield tunnel construction equipment or technical field.

Drawings

Fig. 1 is a schematic structural diagram of the beginning of the present invention;

FIG. 2 is a schematic diagram of the origination process of the present invention;

FIG. 3 is a cross-sectional view AA in FIG. 1;

FIG. 4 is a cross-sectional view of BB of FIG. 1;

fig. 5 is a schematic view showing the distribution of the chemical expansion bolts embedded in the steel plate.

In the figure: 1-two lining structures, 2-negative ring pipe pieces, 3-reference rings, 4-positioning supports, 5-inclined supports, 6-concrete stop beams, 7-first embedded steel plates, 8-second embedded steel plates, 9-third embedded steel plates, 10-reinforcing steel bars, 11-bottom plates, 12-chemical expansion bolts and 15-starting guide platforms.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 5 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The embodiment provides a TBM originating counterforce structure for a small-diameter originating hole, as shown in figures 1 to 4, a two-lining structure 1 is arranged in the originating hole, an originating guide platform 13 is arranged at the bottom of the originating hole, and the counterforce structure comprises a reference ring 3 connected to the tail end of a negative ring segment 2 of a shield tunneling machine, a circle of positioning supports 4 welded along the outer circumference of the reference ring, a circle of inclined supports 5 distributed on the ring surface of one end of the reference ring 3 far away from the negative ring segment 2, and a concrete stop beam 6 cast in a range of 45 degrees at the positive lower part of one end of the reference ring 3 far away from the negative ring segment 2; the positioning supports 4 are radially and equidistantly distributed along the outer circumference of the reference ring 3, the other ends of the positioning supports 4 corresponding to the starting guide platform 13 are welded with a first embedded steel plate 7 arranged on the starting guide platform 13, and the other ends of the other positioning supports 4 are welded with a second embedded steel plate 8 arranged on the second lining structure 1; the inclined struts 5 are distributed in the area, which is not provided with the concrete stop beam 6, on the outer side of the reference ring 3, and the other end of each inclined strut 5 is welded with a third embedded steel plate 9 arranged on the secondary lining structure 1; the second embedded steel plate 8 and the third embedded steel plate 9 are anchored into a whole through chemical expansion bolts 12 and the two-lining structure 1, as shown in fig. 5, a plurality of chemical expansion bolts 12 are distributed on each steel plate, the chemical expansion bolts 12 are distributed at positions close to edges of the steel plates at equal intervals, each chemical expansion bolt 12 is driven into the steel plate after being drilled on the two-lining structure 1, and the driving depth is 20-23 cm. The height of the concrete stop beam 6 is higher than the inner ring surface of the reference ring 3, a plurality of reinforcing steel bars 10 are embedded into the bottom of the concrete stop beam 6, and the depth of the lower ends of the reinforcing steel bars 10 embedded into the bottom plate 11 is at least 20 cm. The pouring height of the concrete retaining beam 6 is 950-1000 mm, the width of the concrete retaining beam 6 is 750-850 mm, two rows of 750-850C 22 reinforcing steel bars are implanted into the bottom of the concrete retaining beam 6, and the depth of an implanted bottom plate of each reinforcing steel bar is 200 mm.

The present invention will be further described with reference to the following embodiments, in which, for an originating end of a tunnel TBM, the originating end is located in a valley between two mountains, an elevation of the originating platform is +27.0, an elevation of the site is about +21.0, a height difference between the originating platform and the construction site is 6m, and the originating platform adopts a bailey frame and ballast backfill mode to meet the originating requirement of the shield. When the TBM starts in a small hole, the conventional reaction frame main beam and the conventional reaction frame secondary beam are too large in size and cannot be installed in a subsurface dug secondary lining hole. The TBM reaction frame needs to adopt a mode of a reference ring and an inclined strut, the reference ring is fixed by taking 20 pieces of 300H-shaped steel around the reference ring 3 as positioning supports, the positioning supports 4 are welded with 600 x 600 square steel plates, and the steel plates are fixed with a main body framework through chemical expansion bolts, so that the reference ring can be stable and cannot radially displace when the reaction frame provides initial reaction force. And then 20 pieces of 300H steel are used as the inclined struts 5, the inclined struts 5 are welded with 800 × 800 square steel plates, the steel plates are fixed with a main body framework through chemical expansion bolts, shield starting counter force is provided, enough counter force is provided, H-shaped steel with different lengths needs to be cut according to position numbers due to different lengths of the inclined struts, two ends of the H-shaped steel are machined into 45-degree inclined planes in advance, and after the H-shaped steel is installed at a preset position, welding operation can be directly carried out. Concrete stop beams 6 with the height 990mm and the width 800mm are poured within the range of 45 degrees at the right lower part of the reference ring so as to enhance the structural strength of the lower part of the reaction frame, two rows of C22 steel bars are implanted at the bottoms of the stop beams, the length is 800mm, the depth of the implanted bottom plate is 200mm, and the distance between the steel bars is 20 cm. And after the construction of the steel bars is finished, installing a template, and pouring by using C35 concrete.

The specific installation process of the second steel plate 8 and the third steel plate 9 is as follows: and second steel plates 8 are uniformly embedded in the inner arc surfaces of the two-lining structures with the same section of the reference ring 3, the size of each second steel plate 8 is 600mm multiplied by 600mm, the thickness of each second steel plate is 20mm, and the second steel plates are embedded between every two adjacent steel plates along the inner surfaces of the two linings at an included angle of 18 degrees. In order to enable the second steel plate 8 and the second-lined concrete structure to form a whole, each second steel plate 8 adopts 12 phi 22 chemical expansion bolts to anchor the steel plate, and 12 phi 24 bolt holes are required to be drilled at positions 5cm away from the edge of the steel plate. The third steel plate 9 is a main stress member for providing TBM starting counterforce for the inclined strut 5 at the rear side of the reference ring 3, the inclined strut 5 and the second steel plate 9 anchored on the secondary lining structure need to be fully welded, the second steel plate 9 is a steel plate with the thickness of 800mm multiplied by 800mm and 20mm, and is also embedded along the inner surface of the secondary lining with an included angle of 18 degrees between every two adjacent steel plates. In order to enable the second steel plates 9 to form a whole with a concrete structure, each second steel plate 9 is anchored with the main body second lining by 12 phi 22 chemical expansion bolts and 4 phi 25 twisted steel bars, and 12 phi 24 bolt holes are required to be drilled at a position 7cm away from the edge of the steel plate. The anchoring second steel plate 8 and the anchoring third steel plate 9 both adopt phi 22 chemical expansion bolts 12, the length is 27cm, and the length of the anchoring second steel plate and the anchoring third steel plate are driven into a secondary lining structure to be 23 cm. Firstly, processing a hard board into the size of an anchoring steel plate, preparing the anchoring steel plate to correspond to the bolt hole position of the steel plate on the paper board, strictly preparing and positioning the position of each steel plate on a two-lining structure according to the hole on the paper board, drilling a concrete structure, wherein the drilling depth is 23cm, and finally, installing a chemical expansion bolt.

Because the counterforce structure provides counterforce thrust when the shield is started, when the counterforce structure is installed, the counterforce inclined support end face is perpendicular to the horizontal shaft of the starting platform, so that the shield axis is parallel to the design axis of the tunnel. When the counter-force inclined supporting leg plate is installed, a gap between the connecting part of the counter-force inclined supporting leg plate and the interval structure is filled up to be solid, so that the counter-force inclined supporting leg plate is guaranteed to have enough compressive strength. The diagonal bracing steel plate is fixed on the main body structure by 12 phi 24 chemical expansion bolts and 4 phi 25 steel bars, the designed shearing resistance of each chemical bolt is 4.5t, the total shearing force of each steel plate is F4.5 + 12+9.8 + 4t 93.2t, the reaction force provided by 20 steel plates reaches 1860t, the thrust initiated by a large distance is 1500t, and the shield reaction force requirement is met.

An embodiment of the present invention, which is described in greater detail and detail, is not to be considered as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A TBM originating counterforce structure for a small diameter originating hole, said originating hole having a secondary lining structure (1) therein and an originating guide (13) at the bottom of the originating hole, characterized in that: the counter-force structure comprises a reference ring (3) connected to the tail end of a negative ring duct piece (2) of the shield tunneling machine, a circle of positioning supports (4) welded along the outer circumference of the reference ring, a circle of inclined supports (5) distributed on the ring surface of one end, far away from the negative ring duct piece (2), of the reference ring (3), and a concrete stop beam (6) poured within 45 degrees of the right lower part of one end, far away from the negative ring duct piece (2), of the reference ring (3); the positioning supports (4) are radially and equidistantly distributed along the outer circumference of the reference ring (3), the other ends of the positioning supports (4) corresponding to the starting guide platform (13) are welded with a first embedded steel plate (7) arranged on the starting guide platform (13), and the other ends of the other positioning supports (4) are welded with a second embedded steel plate (8) arranged on the second lining structure (1); the inclined struts (5) are distributed in the area, where the concrete stop beam (6) is not arranged, of the outer side of the reference ring (3), and the other end of each inclined strut (5) is welded with a third embedded steel plate (9) arranged on the second lining structure (1); the height of the concrete stop beam (6) is higher than the inner ring surface of the reference ring (3), a plurality of steel bars (10) are implanted into the bottom of the concrete stop beam (6), and the depth of the lower end of each steel bar (10) implanted into the bottom plate (11) is at least 20 cm.

2. A TBM originating counterforce structure for small diameter originating holes, according to claim 1, characterized in that: the second embedded steel plate (8) and the third embedded steel plate (9) are anchored into a whole through chemical expansion bolts (12) and the two lining structures (1), a plurality of chemical expansion bolts (12) are distributed on each steel plate, the chemical expansion bolts (12) are distributed at positions, close to the edges, of the steel plates at equal intervals, each chemical expansion bolt (12) is driven in after drilling on the two lining structures (1), and the driving depth is 20-23 cm.

3. A TBM originating counterforce structure for small diameter originating holes according to claim 1 or 2, characterized in that: and two ends of the inclined support (5) are provided with welding inclined planes of 45 degrees.

4. A TBM originating counterforce structure for small diameter originating holes according to claim 1 or 2, characterized in that: the adjacent second embedded steel plates (8) and the adjacent third embedded steel plates (9) are embedded at an included angle of 18 degrees.

5. A TBM originating counterforce structure for small diameter originating holes according to claim 1 or 2, characterized in that: the pouring height of the concrete retaining beam (6) is 950-1000 mm, the width of the concrete retaining beam is 750-850 mm, two rows of 750-850C 22 steel bars are implanted into the bottom of the concrete retaining beam (6), and the depth of an implanted bottom plate of each steel bar is 200 mm.