阅读说明：本技术 用于盾构机始发防扭转装置及其施工方法 (Starting anti-torsion device for shield tunneling machine and construction method thereof ) 是由 吴伟才 孙国华 徐伟 肖浩 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种用于盾构机始发防扭转装置及其施工方法,钢套筒内的下部间隔设置一对轨道,包括以下步骤：步骤一、在盾体上对称设置一对内外贯通的插孔,且一对插孔之间的间距设置为可分别位于一对轨道的两侧；步骤二、将套筒密封固定于所述插孔内,在套筒内壁设置螺纹；步骤三、一对螺杆分别螺纹连接于一对插孔内,且可伸出或缩回至盾体外壁面内。本发明具有结构形式简单、使用方便、密封效果好等优点。(The invention discloses an initial anti-torsion device for a shield tunneling machine and a construction method thereof, wherein a pair of tracks are arranged at the lower part in a steel sleeve at intervals, and the method comprises the following steps: step one, symmetrically arranging a pair of through jacks on a shield body, wherein the distance between the jacks is set to be respectively positioned at two sides of a pair of rails; step two, the sleeve is fixed in the jack in a sealing way, and the inner wall of the sleeve is provided with threads; and step three, the pair of screws are respectively in threaded connection with the pair of jacks and can extend out of or retract into the outer wall surface of the shield body. The invention has the advantages of simple structure, convenient use, good sealing effect and the like.)

1. A construction method for preventing a shield tunneling machine from twisting initially is characterized in that a pair of rails are arranged at the lower part in a steel sleeve at intervals, and the construction method comprises the following steps:

step one, symmetrically arranging a pair of through jacks on a shield body, wherein the distance between the jacks is set to be respectively positioned at two sides of a pair of rails;

step two, the sleeve is fixed in the jack in a sealing way, and the inner wall of the sleeve is provided with threads;

and step three, the pair of screws are respectively in threaded connection with the pair of jacks and can extend out of or retract into the outer wall surface of the shield body.

2. The construction method for starting anti-torsion of the shield tunneling machine according to claim 1, further comprising a fourth step of, when starting, unscrewing the screw rod so that the screw rod extends out of the shield body by 3-5cm toward the outer end of the steel sleeve.

3. The construction method for starting anti-torsion of the shield tunneling machine according to the claim 1 or 2, characterized by further comprising a fifth step of locking the first locking nut on the screw rod and abutting against the inner end face of the sleeve before normal tunneling by the shield tunneling machine, wherein a first sealing ring is arranged between the first locking nut and the inner end face of the sleeve;

and locking a second locking nut on the screw rod and sealing the second locking nut with the first locking nut through a sealing gasket, wherein a closed cap is arranged on the second locking nut, and the screw rod is covered in the second locking nut.

4. The construction method for shield tunneling machine start anti-torsion according to claim 2, wherein the cross section of the outer end of the screw is regular dodecagon, and when the screw is unscrewed, one of the side surfaces of the screw is ensured to be parallel to the side surface of the corresponding track.

5. The construction method for shield tunneling machine to start anti-torsion according to claim 1 or 4, wherein the screw is made of quenched and tempered 42CrMo, and the yield strength of the screw is at least 930 MPa.

6. The construction method for starting anti-torsion of the shield tunneling machine according to claim 1, wherein a distance between the side surface of the track on the same side and the side surface of the outer end of the screw is set to be 2-5 cm.

7. The construction method for shield tunneling machine initial anti-torsion according to claim 1, wherein bosses are formed on the side walls of the outer end of the sleeve towards two sides, the insertion hole is matched with the outer wall of the sleeve, and a second sealing ring is arranged between the bosses and the insertion hole.

8. The construction method for shield tunneling machine initial anti-torsion according to claim 7, wherein the boss of the sleeve is in interference fit with the corresponding jack on the shield body; the shield body inner wall has the dog around the welding of sleeve periphery.

9. The construction method for shield tunneling machine initial anti-torsion according to claim 1, wherein a circle of raw rubber tape is wound on the thread of the screw, and the cross section of the inner end of the screw is a regular hexagon.

10. The utility model provides a be used for shield structure machine to initiate anti-twist device which characterized in that includes:

the pair of jacks are oppositely arranged on the shield body;

the pair of sleeves are coaxially and hermetically arranged in the pair of jacks respectively;

the screw rods are in one-to-one correspondence with the sleeves and are in threaded connection with the corresponding sleeves, so that the outer ends of the screw rods can extend out of or retract into the sleeves;

when the outer ends of the pair of screws extend out of the corresponding sleeves, the outer ends of the pair of screws clamp the pair of rails in the middle, so that the shield body is prevented from rotating in the steel sleeve.

Technical Field

The invention is used for the technical field of tunnel construction devices. More particularly, the invention relates to a starting anti-torsion device for a shield machine and a construction method thereof, which are particularly suitable for the technical field that an anti-blocking iron block cannot be welded on the periphery of a shield body when a steel sleeve is used for starting.

Background

The steel sleeve launching of the shield machine is a novel construction process developed according to a balance principle, when the steel sleeve is launched, before the shield machine is put into a well, the lower half part of the steel sleeve is firstly installed at a designated position of the launching well, the bottom in the sleeve is appropriately backfilled with gravel, the upper part of the steel sleeve is paved with coarse sand, then the shield machine is hoisted and put into the well, finally, the steel sleeve is installed, and backfilling is continued. The water pressure of the balanced tunnel face is provided by the enclosed space of the steel sleeve, and the shield machine can safely start in the steel sleeve. The technology is gradually popularized and used in shield construction. However, the starting has a certain limitation, and when the frictional resistance torque of the steel sleeve support to the shield body, the frictional resistance torque of the tunnel face, the frictional resistance torque of the backfill in the sleeve to the shield shell and the like are not enough to overcome the rotation torque of the cutter head of the shield machine, the shield body may rotate, so that the steel sleeve device is unstable, further the starting may fail, and a major construction risk is caused.

Disclosure of Invention

The invention aims to provide a construction method for preventing the initial torsion of a shield tunneling machine, which has the advantages of simple structure, convenient use, good sealing effect, economy and practicability.

To achieve these objects and other advantages and in accordance with the purpose of the invention, a construction method for shield tunneling machine initial anti-torsion is provided, in which a pair of rails is provided at a lower portion inside a steel sleeve at an interval, comprising the steps of:

step one, symmetrically arranging a pair of through jacks on a shield body, wherein the distance between the jacks is set to be respectively positioned at two sides of a pair of rails;

step two, the sleeve is fixed in the jack in a sealing way, and the inner wall of the sleeve is provided with threads;

and step three, the pair of screws are respectively in threaded connection with the pair of jacks and can extend out of or retract into the outer wall surface of the shield body.

Preferably, the method further comprises the step four of unscrewing the screw when starting, so that the screw extends out of the shield body by 3-5cm towards the outer end of the steel sleeve.

Preferably, the method further comprises a fifth step of locking a first locking nut on the screw rod and abutting against the inner end face of the sleeve before normal tunneling of the shield tunneling machine, wherein a first sealing ring is arranged between the first locking nut and the inner end face of the sleeve;

and locking a second locking nut on the screw rod and sealing the second locking nut with the first locking nut through a sealing gasket, wherein a closed cap is arranged on the second locking nut, and the screw rod is covered in the second locking nut.

Preferably, the cross section of the outer end of the screw is regular dodecagon, and when the screw is screwed out, one side surface of the screw is ensured to be parallel to the side surface of the corresponding track.

Preferably, the screw is manufactured by quenching and tempering 42CrMo, and the yield strength of the screw is required to reach at least 930 MPa.

Preferably, the distance between the side face of the track positioned on the same side and the side face of the outer end of the screw rod is set to be 2-5 cm.

Preferably, the lateral wall of the outer end of the sleeve forms bosses towards two sides, the insertion hole is matched with the outer wall of the sleeve, and a second sealing ring is arranged between the boss and the insertion hole.

Preferably, the boss of the sleeve is in interference fit with the corresponding jack on the shield body; the shield body inner wall has the dog around the welding of sleeve periphery.

Preferably, a circle of raw rubber belt is wound on the thread of the screw, and the section of the inner end of the screw is in a regular hexagon shape.

The invention also provides an initial anti-twisting device for the shield tunneling machine, which comprises:

the pair of jacks are oppositely arranged on the shield body;

the pair of sleeves are coaxially and hermetically arranged in the pair of jacks respectively;

the screw rods are in one-to-one correspondence with the sleeves and are in threaded connection with the corresponding sleeves, so that the outer ends of the screw rods can extend out of or retract into the sleeves;

when the outer ends of the pair of screws extend out of the corresponding sleeves, the outer ends of the pair of screws clamp the pair of rails in the middle, so that the shield body is prevented from rotating in the steel sleeve.

The invention at least comprises the following beneficial effects:

1. the invention has simple and practical structure and smaller structure size, and the opened round through hole has no great influence on the structure and the strength of the shield body. When the screw rod extends out of the shield body, the shield body can be temporarily limited on the pair of tracks so as to prevent the shield body from rotating in the steel sleeve; when the screw rod retracts into the shield body, the interference to the normal construction of the shield can not be caused.

2. The invention has good sealing effect, is provided with a plurality of seals, comprises two O-shaped sealing ring seals and a corrosion-resistant rubber sealing gasket, has self-sealing of screw threads on the inner periphery, sealing of raw rubber belts and nuts with caps, has excellent sealing effect on the opening of the shield machine, and can not cause mud to flow backwards to enter the shield body.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic view of the present invention in positional relationship to a pair of tracks;

FIG. 2 is an enlarged view of FIG. 1A;

FIG. 3 is a schematic view of the screw of the present invention shown without the sleeve extending therefrom;

FIG. 4 is a schematic view of the screw extension sleeve of the present invention.

Description of reference numerals: 1. the device comprises a screw, 2, a raw rubber belt, 3, a second locking nut, 4, a rubber sealing gasket, 5, a first locking nut, 6, a first sealing ring, 7, a stop dog, 8, a sleeve, 9, a second sealing ring, 10, a shield body, 11, a steel sleeve, 12 and a track.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 4, the invention provides a construction method for a shield tunneling machine initial anti-torsion device, wherein a pair of rails 12 are arranged at intervals at the lower part in a steel sleeve 11, the rails 12 extend along the length direction of the steel sleeve 11, and the steel sleeve 11 is the same as the steel sleeve 11 in the existing shield construction, and only the rails 12 need to be matched with the anti-torsion device. The method comprises the following steps:

step one, symmetrically arranging a pair of through jacks on a shield body 10, wherein the distance between the jacks is set to be respectively positioned at two sides of a pair of rails 12;

step two, the sleeve 8 is hermetically fixed in the jack, threads are arranged on the inner wall of the sleeve 8, in the embodiment, the jack is formed by two sections of coaxial cylindrical structures, the diameter of the cylindrical structure extending outwards along the radial direction of the shield body 10 is slightly larger, and the part of the sleeve 8 inserted into the jack is matched with the structure of the jack.

And step three, the pair of screw rods 1 are respectively in threaded connection with the pair of jacks and can extend out of or retract into the outer wall surface of the shield body 10.

And step four, screwing out the screw 1 during starting, so that the screw 1 extends out of the shield body 103-5cm towards the outer end of the steel sleeve 11. In the propelling process of the shield machine, the shield body 10 rotates due to overlarge torsion of the cutter head, when the shield body 10 rotates for a certain angle, the end of the screw rod 1 can touch the side surface of the rail 12 in the steel sleeve 11, and the shield body 10 is prevented from further rotating under the resistance of the side surface of the rail 12, so that the torsion-preventing function of the shield body 10 is achieved.

In the actual construction process, it is more common that: the diameter of the outer diameter of the shield body 10 is 6460mm, the rail 12 is a P43 steel rail, and a row of stoppers 7 are welded on the inner side of the rail 12; before the screw rod 1 is installed, the thread surface of the screw rod 1 needs to be coated with butter in advance, the shield body 10 is prevented from twisting when a steel sleeve of the shield machine starts, the screw rod 1 extends out of the shield body 10 by about 4cm, when the steel sleeve 11 starts, the distance between the outer end of the screw rod 1 and a track 12 outside the shield body 10 keeps about 2cm, and the screw rod 1 is parallel to the edge of the track 12 on the same side, so that when the shield body 10 of the shield machine twists, one side of a regular dodecagon at the outer end of the screw rod 1 can be in contact with the side surface of the track 12. It should be noted that: the distance between the outer end of the screw 1 and the track 12 outside the shield 10 is kept about 2cm, so that after the shield 10 of the shield machine is twisted by 0.5 degrees in the forward or reverse direction at most, the screw 1 is abutted against the track 12, and the shield 10 is prevented from rotating in the steel sleeve 11. One of the pair of screws 1 always acts as a limit to prevent the shield body 10 from rotating inside the steel sleeve 11, regardless of whether the shield body 10 rotates clockwise or counterclockwise. The inner end of the screw 1 is manually rotated so that the outer end of the screw 1 extends or retracts into the sleeve 8.

In a preferred embodiment of the construction method for the shield machine initial anti-torsion device, the method further comprises a fifth step of locking a first locking nut 5 on the screw rod 1 and abutting against the inner end face of the sleeve 8 before the shield machine normally tunnels, and a first sealing ring 6 is arranged between the first locking nut 5 and the inner end face of the sleeve 8;

and locking a second locking nut 3 on the screw rod 1 and sealing the second locking nut 3 with a first locking nut 5 through a rubber sealing gasket 4, wherein a closed cap is arranged on the second locking nut 3, and the screw rod 1 is covered in the closed cap.

In the technical scheme, when the steel sleeve 11 starts, only the jack and the sleeve 8 are sealed, but the simple sealing of the jack and the sleeve 8 cannot ensure that mud cannot flow backwards into the shield body 10 when the shield is excavated, so that the part of the sleeve 8 extending into the shield body 10 is further sealed, and the secondary sealing effect is achieved through the locking nut.

The first locking nut 5 and the second locking nut 3 are installed by controlling the first locking nut 5 to be fixed and then screwing the second locking nut 3 by using a spanner. In this application, one of the purposes of arranging two sets of locking nuts is to prevent loosening, the other is to strengthen the sealing effect, and the third is to prevent the misoperation of an operator, and to screw the screw rod 1 out of the sleeve 8 or unscrew.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device, the cross section of the outer end of the screw 1 is regular dodecagon, and when the screw 1 is screwed out, one side surface of the screw 1 is ensured to be parallel to the side surface of the corresponding track 12, so that when the shield body 10 rotates, the track 12 provides resistance to enable the shield body 10 of the shield tunneling machine not to be twisted; when the shield is normally tunneled, the screw 1 retracts into the shield body 10, and the retraction length of the screw 1 is also adjusted by rotating the inner end of the screw 1.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device, the screw 1 is manufactured and processed from hardened and tempered 42CrMo, the yield strength of the screw needs to reach at least 930Mpa, the hardened and tempered screw 1 has high strength and toughness, the middle section is a threaded rod structure with coarse threads, and the middle section extends or retracts in the sleeve 8 through the rotation of the threads, and further extends out of the shield body 10 or retracts into the shield body 10.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device, the distance between the side surface of the track 12 located on the same side and the side surface of the outer end of the screw 1 is set to be 2-5 cm.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device, bosses are formed on the side walls of the outer end of the sleeve 8 towards two sides, the jack is matched with the outer wall of the sleeve 8, and a second sealing ring 9 is arranged between the bosses and the jack.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device of the present application, the boss of the sleeve 8 is in interference fit with the corresponding jack on the shield body 10; the inner wall of the shield body 10 is welded with a stop dog 7 around the periphery of the sleeve 8.

In the above technical scheme, the sleeve 8 and the jack are in interference fit, so that the sleeve 8 is conveniently replaced when the thread of the sleeve 8 fails. The stop 7 and the sleeve 8 can be in interference fit, and the arrangement of the stop 7 can increase the strength of the shield body 10 near the jack. More preferably, only the boss of the sleeve 8 is in interference fit with the jack of the shield body 10, and the other parts of the sleeve 8 are in clearance fit with the jack, so that the sealing performance can be ensured, and the installation difficulty of the sleeve 8 can be reduced.

In a preferred embodiment of the construction method for the shield tunneling machine initial anti-torsion device, a circle of raw rubber belt 2 is wound on the thread of the screw rod 1 to enhance sealing and prevent mud from flowing backwards into the shield body 10. The cross section of the inner end of the screw rod 1 is in a regular hexagon shape. Can cooperate common assembly and disassembly tools, if 8 spanners of hexagonal socket use, labour saving and time saving.

Another embodiment of the present application provides a device for preventing rotation of a shield machine, including: a pair of insertion holes oppositely arranged on the shield body 10; a pair of sleeves 8 coaxially and hermetically arranged in the pair of jacks respectively; a pair of screws 1, which correspond to the sleeves 8 one by one, wherein the screws 1 are connected in the corresponding sleeves 8 in a threaded manner, so that the outer ends of the screws 1 can extend out of or retract into the sleeves 8; when the outer ends of the pair of screws 1 extend out of the corresponding sleeves 8, the outer ends of the pair of screws 1 clamp the pair of rails 12 in the middle, so that the shield body 10 is prevented from rotating in the steel sleeve 11.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.