CN221074266U

CN221074266U - Be used for minor diameter tunnel shield to construct section of jurisdiction structure

Info

Publication number: CN221074266U
Application number: CN202322674640.8U
Authority: CN
Inventors: 唐荣; 余长益; 王全胜; 张东彦; 付增; 郭江龙; 任韶鹏; 李鹏; 魏旭鹏; 张奇隆; 范晓冬
Original assignee: China Railway Engineering Equipment Group Co Ltd CREG
Current assignee: China Railway Engineering Equipment Group Co Ltd CREG
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-06-04
Anticipated expiration: 2033-10-07

Abstract

The utility model provides a shield segment structure for a small-diameter tunnel, which comprises the following components: the duct piece is divided, and S-shaped cambered surfaces for mortise and tenon connection with adjacent duct piece blocks are arranged on the end surfaces of the duct piece blocks; and the connecting mechanism is connected between the adjacent duct piece blocks. The S-shaped cambered surface mortise and tenon embedded structure is adopted at the pipe piece joint, so that the problem that the pipe piece is extruded and damaged easily due to uneven point-surface contact and contact corners under the condition of a plane joint is avoided; after the pipe piece is looped, the connecting mechanism is used for restraining the displacement of the pipe piece, so that the number of hand holes and the number of bolts are reduced, the bearing capacity of the section of the pipe piece is improved, and the cost is saved; the utility model has less blocks, solves the problems of more joints and poor waterproof sealing performance of multi-pipe piece blocks, has simple assembly steps, and improves assembly efficiency and looping quality.

Description

Be used for minor diameter tunnel shield to construct section of jurisdiction structure

Technical Field

The utility model relates to the technical field of duct pieces, in particular to a shield duct piece structure for a small-diameter tunnel.

Background

With the development of cities and the gradual expansion of scales, the development of underground space is increasingly advanced, and the micro shield construction technology is particularly suitable for projects with small diameter, long distance, multiple curvatures, small turning radius and the like. The prefabricated segment structure is widely applied to underground engineering due to the advantages of high construction efficiency, good construction quality, less material waste and the like.

The common duct piece joint at present has the forms of bolt connection, mortise connection and the like. The bearing capacity of the conventional joint is far lower than that of the segment body, so that the whole bearing capacity of the segment is reduced. In complex and changeable engineering environments, underground structures often face large-span, heavy load, dynamic load and other conditions, and due to lower bearing capacity of joints, instability and damage of tunnel structures are easily caused in special environments, so that life and property safety of people is endangered.

In recent years, the development of novel shield segments has been mainly developed in the direction of joint structural design. The Chinese patent application No. CN202220905841.7 discloses a shield segment mortise and tenon joint model, wherein segment mortise and tenon joints similar to trapezoid bosses are arranged to splice segment rings, and then a connecting assembly is inserted to fix the segment structure, so that the stress characteristic of the segment joint is improved, but the joint plane contact has corners which are easy to cause extrusion damage.

The Chinese patent application No. CN202221374932.9 of 2022-06-02 discloses a high-strength prefabricated segment and a supporting structure using the prefabricated segment, a structure with an inserting tongue and an inserting groove is arranged at the front end and the rear end of the segment body, a male connector and a female connector of the front segment and the rear segment are spliced by a splicing machine during splicing, segment splicing is completed through splicing interference fit, manual operation time is shortened, and accordingly splicing efficiency is improved. But the male connector plug tongue that sets up is double-end structure, and structural style is complicated, very easily collides with the extrusion when transportation and assembling, influences structural strength.

Therefore, based on the above situation, the design of the special segment with good joint reliability, high bearing capacity, simple assembly process and high efficiency is necessary to ensure the looping quality.

Disclosure of Invention

Aiming at the technical problems, the utility model provides a shield segment structure for a small-diameter tunnel, which is used for solving the problems that segment connecting joints are easy to squeeze and damage and the structure is complex in the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a shield segment structure for a small diameter tunnel, comprising:

the duct piece is divided, and S-shaped cambered surfaces for mortise and tenon connection with adjacent duct piece blocks are arranged on the end surfaces of the duct piece blocks;

And the connecting mechanism is connected between the adjacent duct piece blocks. Through using coupling mechanism to fix after the ring formation, reduced hand hole and bolt use quantity, improve section of jurisdiction bearing capacity.

Further, in order to facilitate the connection of adjacent duct piece segments, the connection mechanism comprises a fastener which can be inserted into two adjacent duct piece segments; in addition, in order to facilitate the arrangement of the fasteners, reserved fastening holes for the insertion of the fasteners are formed in the duct piece blocks.

Further, in order to make the arrangement of the fastener more stable and reliable, the connecting mechanism further comprises a fixing assembly for fixing the fastener; the fixing assembly comprises a nut pre-buried in the reserved fastening hole and a fastening bolt penetrating through the fastening piece, and the fastening bolt is in threaded connection with the nut.

Further, in order to facilitate the insertion of the fastener into the adjacent segment, the fastener is in a "C" or "U" configuration.

Further, in order to reduce the segment division quantity, the sealing waterproof difficulty caused by the fact that the segment joints are divided is avoided, the looping quality of the segment is improved, and the segment blocks comprise a first lower segment, a second lower segment and a top segment which can be spliced into loops.

Further, in order to be used for being fixed on the shield body in the stage of assembling the segment piecewise, a through hole for connecting the shield body is arranged on the first lower segment, and the through hole and the reserved fastening hole are coaxially arranged; the through hole and the reserved fastening hole can be connected with a retaining bolt.

Further, in order to set a second lower duct piece on the other side of the first lower duct piece, the convex part of the S-shaped cambered surface at the lower end of the first lower duct piece is positioned on the lower side of the concave part; in addition, in order to enable the convex surfaces of the duct piece ends on two sides of the lower part to restrict the top duct piece from being blocked, the top duct piece is prevented from falling down, and S-shaped cambered surfaces at two ends of the top duct piece are symmetrically arranged.

Further, in order to be used for pulling back two section of jurisdictions of lower part and assemble into the ring, the upper end of first lower section of jurisdiction and second lower section of jurisdiction is connected with the cable that is used for pulling back first lower section of jurisdiction and second lower section of jurisdiction respectively.

Further, in order to ensure that the safety of the outer concave-inner convex joint structure is not damaged by extrusion collision, an outer wrapping steel is arranged on the S-shaped cambered surface of the segment block.

Further, in order to play a waterproof sealing role, a sealing water stop strip is arranged in the duct piece block.

The utility model has the beneficial effects that:

1. The duct piece adopts a three-division type block statically determinate structure, has few blocks, avoids the problems of more joints and poor waterproof sealing performance of multi-duct piece blocks, has simple assembling steps, and improves the assembling efficiency and the looping quality;

2. The S-shaped cambered surface mortise and tenon embedded structure is adopted at the pipe piece joint, so that the problem that the pipe piece is extruded and damaged easily due to uneven point-surface contact and contact corners under the condition of a plane joint is avoided;

3. According to the utility model, after looping, the connecting mechanism and the prefabricated fastener are utilized to restrict the displacement of the duct piece, so that the number of hand holes and the number of bolts are reduced, the bearing capacity of the section of the duct piece is improved, and the cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a segment structure according to the present utility model;

FIG. 2 is a first segment assembly step of the present utility model;

FIG. 3 is a second segment assembly step of the present utility model;

fig. 4 is a third segment assembly step diagram of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 4A;

FIG. 6 is a schematic view of the structure of the fastener of the present utility model.

In the figure: 1. a first lower segment; 2. a second lower segment; 3. dividing the top segment into blocks; 5. Reserving fastening holes; 6. a through hole; 7. a fastener; 8. a fastening bolt; 9. a holding bolt; 10. a guy cable; 11. a sleeper; 12. sealing the water stop strip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 6, the shield segment structure for the small-diameter tunnel according to embodiment 1 of the present utility model is mainly applicable to small-diameter long-distance multi-curvature small-turning-radius micro shield construction. This be used for minor diameter tunnel shield to construct section of jurisdiction structure includes: the pipe segments can be spliced into a ring. As shown in fig. 5, the splicing end surface of each segment block is provided with an S-shaped cambered surface, and the S-shaped cambered surfaces of the adjacent segment blocks close to one end are matched, so that the adjacent segment blocks are connected through mortise and tenon joints of the S-shaped cambered surfaces, and the joints between segment blocks are rotatable and immovable, so that the system is self-forming into a triangle static structure. The segment can be in unstable state when deviating from the shield tail after the segment piecemeal is assembled, consequently use coupling mechanism to fix after the segment becomes the ring, coupling mechanism set up be used for connecting adjacent segment piecemeal between adjacent segment piecemeal for fix the segment of concatenation ring, reduced hand hole and bolt use quantity, improve segment cross-section bearing capacity. And the connecting mechanism ensures the stability of the annular pipe slice when the shield tail is pulled out, and the pipe slice is prevented from being disassembled when the shield tail is pulled out through the connecting mechanism.

In this embodiment, as shown in fig. 1 to 4, the segment is three-segment. Specifically, the duct piece block comprises a first lower duct piece 1, a second lower duct piece 2 and a top duct piece block 3 which can be spliced into a ring, wherein the first lower duct piece 1 and the second lower duct piece 2 are respectively positioned on the left lower side and the right lower side. The duct piece is three-division type, so that the division number of the duct piece is reduced, and the sealing and waterproof difficulty caused by the fact that the seams of the duct pieces are divided into multiple parts is avoided; and the number of the blocks is small, the assembly accuracy is high, and the looping quality is improved to a certain extent.

Further, the duct pieces are three-equal-division type, and each duct piece partition piece and the circle center of the duct piece form an angle of 120 degrees.

During splicing construction, as the first lower duct piece 1 is the duct piece firstly arranged on the shield body in the splicing stage, the S-shaped cambered surface at the lower end of the first lower duct piece 1, namely, the convex part of the S-shaped cambered surface matched with the second lower duct piece 2 is positioned at the lower side of the concave part, the convex part of the S-shaped cambered surface matched with the second lower duct piece 2 is positioned at the upper side of the concave part, and the convex part of the S-shaped cambered surface at the lower end of the second lower duct piece 2 which is convenient to later arrange is divided on the convex part of the S-shaped cambered surface at the lower end of the first lower duct piece 1, so that mortise-tenon connection is carried out between the second lower duct piece 2 and the lower end of the first lower duct piece 1 in splicing construction is convenient.

Further, as shown in fig. 1, the S-shaped cambered surfaces at two ends of the top segment block 3 are symmetrically arranged, so that the top segment block is conveniently placed above the arranged first lower segment and second lower segment, and more importantly, the convex surfaces of the segment ends at two sides of the lower part can restrict the top segment block, and the top segment block is prevented from falling down. In this embodiment, as shown in fig. 1, the convex portions of the S-shaped cambered surfaces at two ends of the top segment block 3 are located on the upper sides of the concave portions, that is, the convex portions are disposed near the outer sides of the segments, so that the convex portions of the S-shaped cambered surfaces on the first lower segment 1 and the second lower segment 2, which are matched with the top segment block 3, are located on the inner sides of the concave portions, and the top segment block 3 is conveniently disposed above the first lower segment 1 and the second lower segment 2. Further, as shown in fig. 3, the S-shaped cambered surfaces at the two ends of the first lower segment 1 are rotationally symmetrical. The S-shaped cambered surfaces at the two ends of the second lower segment 2 are symmetrically arranged.

In addition, as shown in fig. 5, a slope toe is arranged at the junction of the concave surface structure of the S-shaped cambered surface and the inner edge and the outer edge of the duct piece, so that the duct piece is prevented from extruding the crushing angle in the transportation and assembly processes.

Embodiment 2 differs from embodiment 1 in that the connection mechanism comprises a fastener 7 insertable into adjacent two segment segments, as shown in fig. 1 and 6. And the corresponding positions on the duct piece blocks are provided with reserved fastening holes 5 for inserting fasteners 7, namely reserved fastening holes 5 are respectively arranged at the two ends of the top duct piece block 3, the upper end and the lower end of the first lower duct piece 1 and the upper end and the lower end of the second lower duct piece 2. In this embodiment, as shown in fig. 6, the fastener 7 has an approximate structure of a "C" shape or a "U" shape or a saddle shape, so that two ends of the fastener 7 can be inserted into the reserved fastening holes 5 of the adjacent duct piece segments to connect the adjacent two duct piece segments. In other embodiments, other configurations of the fastener 7 are possible.

Further, in order to make the two ends of the fastening member 7 be more stably fixed after being inserted into the reserved fastening holes 5, the connecting mechanism further comprises a fixing assembly for fixing the fastening member 7. As shown in fig. 1 and 6, the fixing component comprises a nut and a fastening bolt 8 which are in threaded connection, the nut is pre-buried at the inner bottom of the reserved fastening hole 5, and the nut and the reserved fastening hole 5 are coaxially arranged. The fastening bolt 8 is penetrated through the fastening member 7. Wherein, the fastening piece 7 is provided with a through hole for the fastening bolt 8 to pass through. After passing through the through hole of the fastener 7 in the reserved fastening hole 5, the fastening bolt 8 is in threaded connection with a nut pre-buried at the bottom of the reserved fastening hole 5, so that the fastener 7 is fixed.

Embodiment 3 differs from embodiment 2 in that, as shown in fig. 2, a through hole 6 for connecting the shield body is provided at the upper end of the first lower segment 1, and the through hole 6 is coaxially connected with a reserved fastening hole 5 at the upper end of the first lower segment 1; the retaining bolts 9 can be connected with the reserved fastening holes 5 by means of the through holes 6, the retaining bolts 9 being used for temporarily fixing the first lower segment 1 during the assembly phase. Wherein, reserve fastening hole 5 sets up the position that is close to the section of jurisdiction inboard on first lower section of jurisdiction 1, and through-hole 6 sets up the position that is close to the section of jurisdiction inboard on first lower section of jurisdiction 1 to through-hole 6 communicates with reserving fastening hole 5. So that in the assembly stage, the retaining bolt 9 can penetrate into the reserved fastening hole 5 to be connected with the shield body through the through hole 6 after being in threaded connection with the nut, thereby fixing the first lower segment 1.

Embodiment 4 differs from embodiment 3 in that, as shown in fig. 4, the upper ends of the first lower segment 1 and the second lower segment 2 are respectively connected with a cable 10, and the cable 10 is used for pulling back the assembled first lower segment 1 and second lower segment 2 in the segment assembling stage. In this embodiment, two ends of the stay cable 10 are connected with reserved fastening holes 5 at the upper ends of the first lower segment 1 and the second lower segment 2. The stay rope 10 is connected to the reserved fastening holes 5 at the upper ends of the first lower duct piece 1 and the second lower duct piece 2, the stay rope 10 is pulled to achieve duct piece splicing into a ring, the fastening holes are reserved at the two sides of the joint after the ring is formed, the fastening pieces 7 are inserted, the bolts are fastened again, the ring forming pipe pieces are fixed, the number of bolt holes among duct pieces is reduced, and bolt hole pulling, cracking and shearing damage caused by stress concentration are effectively prevented.

The connecting mechanism is inserted after the top duct piece 3 is spliced with the first lower duct piece 1 and the second lower duct piece 2. Specifically, 3 segments are spliced into a ring through the inhaul cable, and the whole ring segment is of a geometrically statically determined structure and can be stable. The cable can then be temporarily removed to facilitate installation of the connection mechanism.

Embodiment 5 differs from embodiment 4 in that a connecting mechanism is not used, because the segment is self-stabilizing under the action of the peripheral soil body after being spliced. If the gap between the shield tails is small enough, when the whole ring pipe piece is separated from the shield tails, the shield body plays a supporting role on each pipe piece, so that the whole ring pipe joint can be ensured not to be disassembled and to be scattered, a connecting mechanism can be omitted, and a geometrical stable system is formed by utilizing the self-hinging structure of the pipe piece.

Embodiment 6 is different from embodiment 1 in that waterproof grooves are respectively arranged at the center of the concave-convex part of the S-shaped cambered surface at the pipe piece interface, and the waterproof grooves are annularly arranged along the pipe piece through length and extend to the two sides of the pipe piece. The waterproof groove is used for installing a sealing water stop strip and plays a role in waterproof sealing.

Embodiment 7 is different from embodiment 6 in that, as shown in fig. 5, a sealing water stop strip 12 is arranged in the segment block to play a role of waterproof sealing. The sealing water stop 12 is arranged in the duct piece block along the cambered surface of the duct piece, and the sealing water stop 12 is arranged in a waterproof groove in the duct piece block. The sealing water stop 12 is provided with two layers in the segment block, and the ends of the two layers of sealing water stop 12 are respectively positioned in the waterproof grooves from the centers of the convex part and the concave part of the S-shaped cambered surface to the outer side.

Embodiment 8 is different from embodiment 1 in that, in order to ensure that the S-shaped arc surface joint structure of the outer concave and the inner convex is safe from being damaged by extrusion collision, the S-shaped arc surface of the segment block is provided with an outer coating steel for reinforcing the part.

Embodiment 9 differs from embodiment 1 in that, as shown in fig. 2 to 4, a sleeper 11 is further provided for supporting the segment from the tail of the shield in the segment assembly stage.

Embodiment 10 is different from embodiment 1 in that the circumferential joint between segments is of an S-shaped concave-convex structure, the circumferential joint of the assembled segment of the previous ring is concave and convex, the next ring is concave and convex, and the front ring pipe and the rear ring pipe are embedded together for continuous assembly under the pushing action of the shield cylinder.

The utility model is assembled by the following construction method:

S1, as shown in FIG. 2, taking a sleeper 11 as a fulcrum, using a duct piece assembling machine to enable a first lower duct piece 1 to rotate anticlockwise with the sleeper 11 as a rotation center until leaning on a shield body, and using a retaining bolt 9 to penetrate through a through hole 6 and connect the shield body to temporarily fix the duct piece 1;

S2, as shown in FIG. 3, similarly, the second lower duct piece 2 is rotated clockwise around the concave-convex structure of the S-shaped cambered surface joint at the lower part of the first lower duct piece 1 by using the duct piece splicing machine and taking the sleeper 11 as a fulcrum until the concave-convex structure is symmetrical with each other by leaning on the shield body;

s3, as shown in FIG. 4, the upper sides of the first lower duct piece 1 and the second lower duct piece 2 are tightly attached to the shield body, the upper space is sufficient, the top duct piece block 3 is moved to the upper part of the shield body, the stay cable 10 is utilized to be connected with the reserved fastening holes 5 on the upper sides of the first lower duct piece 1 and the second lower duct piece 2, the retaining bolts 9 are detached, so that the first lower duct piece 1 can move (rotate), the stay cable is slowly pulled back, the first lower duct piece 1 and the second lower duct piece 2 rotate around the concave-convex cambered surfaces of the bottom joints to be assembled into a ring position, the top duct piece block 3 is moved downwards, the left joint and the right joint of the top duct piece block 3 are connected with the first lower duct piece 1 and the second lower duct piece 2, and the joints are in mortise-tenon embedding;

S4, as shown in FIG. 1, after the duct pieces are assembled into a ring in S3, the inhaul cable 10 is disassembled, the fastening pieces 7 are inserted into the reserved fastening holes 5 at the two sides of the joint, the fastening pieces are connected with the reserved fastening holes by the fastening bolts 8, and the duct pieces are assembled.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. Be used for minor diameter tunnel shield to construct section of jurisdiction structure, characterized in that includes:

And the connecting mechanism is connected between the adjacent duct piece blocks.

2. The shield segment structure for a small-diameter tunnel according to claim 1, wherein: the connecting mechanism comprises fasteners (7) which can be inserted into two adjacent duct piece blocks, and reserved fastening holes (5) for inserting the fasteners (7) are formed in the duct piece blocks.

3. The shield segment structure for a small-diameter tunnel according to claim 2, wherein: the connecting mechanism further comprises a fixing assembly for fixing the fastener (7); the fixing assembly comprises a nut pre-buried in the reserved fastening hole (5) and a fastening bolt (8) penetrating through the fastening piece (7), and the fastening bolt (8) is in threaded connection with the nut.

4. A shield segment structure for a small diameter tunnel according to claim 2 or 3, characterized in that: the fastener (7) is of a C-shaped or U-shaped structure.

5. A shield segment structure for a small diameter tunnel according to claim 2 or 3, characterized in that: the duct piece block comprises a first lower duct piece (1), a second lower duct piece (2) and a top duct piece block (3) which can be spliced into a ring.

6. The shield segment structure for a small-diameter tunnel of claim 5, wherein: the convex part of the S-shaped cambered surface at the lower end of the first lower segment (1) is positioned at the lower side of the concave part; s-shaped cambered surfaces at two ends of the top duct piece block (3) are symmetrically arranged.

7. The shield segment structure for a small-diameter tunnel of claim 5, wherein: the first lower duct piece (1) is provided with a through hole (6) for connecting the shield body, and the through hole (6) and the reserved fastening hole (5) are coaxially arranged; the through hole (6) and the reserved fastening hole (5) can be connected with a retaining bolt (9).

8. The shield segment structure for a small-diameter tunnel of claim 5, wherein: the upper ends of the first lower duct piece (1) and the second lower duct piece (2) are respectively connected with a guy cable (10) for pulling the first lower duct piece (1) and the second lower duct piece (2) back.

9. The shield segment structure for a small-diameter tunnel according to any one of claims 1 to 3 or 6 to 8, characterized in that: and an outer steel coating is arranged on the S-shaped cambered surface of the segment block.

10. The shield segment structure for a small-diameter tunnel according to any one of claims 1 to 3 or 6 to 8, characterized in that: and a sealing water stop strip (12) is arranged in the duct piece block.