CN217999601U - Major diameter shield tunnel assembled track down structure - Google Patents
Major diameter shield tunnel assembled track down structure Download PDFInfo
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- CN217999601U CN217999601U CN202221781304.2U CN202221781304U CN217999601U CN 217999601 U CN217999601 U CN 217999601U CN 202221781304 U CN202221781304 U CN 202221781304U CN 217999601 U CN217999601 U CN 217999601U
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Abstract
The utility model provides a major diameter shield tunnel assembled under-rail structure, including middle prefabricated box culvert, limit culvert prefabricated cover plate, limit culvert arc curb plate and tunnel bottom backfill layer, middle prefabricated box culvert is connected through embedded bar connector with limit culvert arc curb plate, and limit culvert prefabricated cover plate and middle prefabricated box culvert, limit culvert arc curb plate pass through the bolt, the spacer pin is connected; the under-rail structure is longitudinally communicated into a whole through a middle prefabricated box longitudinal connecting bolt and a cast-in-place side culvert arc-shaped side plate; and filling a gap between the lower surface of the tunnel bottom backfill precast block and the inner arc surface of the duct piece by grouting material. The utility model discloses structure adopts the high-efficient construction technique of assembled under the rail, can realize assembling the synchronous construction with shield tunnelling, section of jurisdiction, has guaranteed the whole longitudinal rigidity and the stability of structure under the rail simultaneously, has that degree of mechanization and efficiency of construction are high, construction quality are controllable, can improve the interior construction operation environment of tunnel, reduce advantages such as construction safety risk.
Description
Technical Field
The utility model relates to a shield constructs under tunnel rail structure construction technical field, especially relates to a major diameter shield constructs under tunnel assembled rail structure.
Background
With the development of traffic construction and urban overall planning, the tendency of railways and the like to adopt tunnel construction when entering urban areas or crossing large rivers is gradually increased due to the influence of factors such as environmental conditions along the lines, ground traffic and the like. The shield tunnel construction technology has the advantages of small influence on the surrounding environment, high construction mechanization degree, controllable construction period and the like, and is widely applied to urban area and underwater tunnel engineering construction.
The structure under the inner rail of the large-diameter shield tunnel such as the railway at home and abroad mainly adopts the following three structural schemes according to the construction mode: the first is an integral cast-in-place structure; the second type is a prefabricated middle box culvert and two-side cast-in-place plate structure; the third is an integral prefabricated structure. The first structure is gradually eliminated by the market due to low mechanization degree and high difficulty in construction organization and quality control; the second structure locally adopts a prefabrication and assembly process, improves the construction technical level and efficiency to a certain extent, and is the most structural form adopted at present; the third structure has the problems of high requirements on tooling equipment, poor longitudinal integrity of the structure under the rail and the like, and is generally suitable for tunnel engineering with relatively small section and better geological conditions.
In recent years, large railway tunnel projects such as Jiang Yuehai span are more and more, the construction of the under-rail structure has great influence on the construction period of the project, and the requirement of the railway tunnel on the longitudinal stability of the under-rail structure is high. Therefore, it is an urgent need to solve the problem of providing a large-diameter shield tunnel under-rail structure with high mechanization degree, fast construction and no influence on the overall stability.
Disclosure of Invention
In view of this, the utility model aims at providing a major diameter shield tunnel assembled track lower structure that degree of mechanization is higher, the construction is swift, structural integrity is better.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model provides a major diameter shield tunnel assembled track down structure, backfill layer at the bottom of prefabricated box culvert, the prefabricated apron of limit culvert, limit culvert arc curb plate and tunnel in the middle of including, the both sides wall top outside of middle prefabricated box culvert all is equipped with the bracket, the arc board is convex at the bottom of the box culvert of middle prefabricated box culvert, and shield section of jurisdiction internal surface is concentric circles and reserves 50mm thick space seted up fretwork backfill hole on the arc board at the bottom of the box culvert the both sides of middle prefabricated box culvert are cast-in-place construction respectively limit culvert arc curb plate, the overlap joint of limit culvert prefabricated apron is installed on middle prefabricated box culvert and limit culvert arc curb plate, backfill layer sets up at the bottom of the tunnel in the fretwork backfill hole of middle prefabricated box culvert, fills the reservation space between arc board and the shield section of jurisdiction internal surface at the bottom of box culvert. The backfill layer at the bottom of the tunnel longitudinally forms a limiting structure in the middle of the prefabricated box culvert through the hollowed backfill holes, and the cast-in-place side culvert arc-shaped side plates longitudinally connect the assembled under-rail structure into a whole, so that the integral longitudinal rigidity and stability of the under-rail structure are ensured.
Furthermore, the middle prefabricated box culverts are arranged side by side, and four groups of oblique straight bolts are adopted for connection between every two adjacent middle prefabricated box culverts.
Further, the connection part of the box culvert bottom arc plate of the middle prefabricated box culvert and the arc-shaped plate of the edge culvert arc-shaped side plate is connected with the connecting steel bars through the embedded steel bar connector, and the embedded steel bar connector is arranged in the box culvert bottom arc plate.
Furthermore, the middle prefabricated box culvert is the same as the shield segment, and the prefabricated middle box culvert is produced in a factory manner, is assembled in the tunnel and is constructed in a square structure.
Furthermore, arc supports are arranged at four corners of the lower surface of the box culvert bottom arc plate, and the thickness of a gap reserved between the box culvert bottom arc plate and the inner surface of the shield segment is the same as the height of the arc supports.
Furthermore, the edge culvert arc-shaped side plate comprises a circular arc-shaped plate concentric with the inner surface of the shield segment and an edge culvert prefabricated cover plate supporting bracket arranged at the top end of the circular arc-shaped plate. The side culvert arc-shaped side plate is constructed by adopting a mould building method, the built-in steel reinforcement framework is prefabricated and processed by a factory, the field steel reinforcement binding operation is avoided, and the construction efficiency is improved.
Furthermore, the edge culvert prefabricated cover plate is the same as the shield segment, and is produced in a factory manner and is assembled in the tunnel. Overlap joint in middle prefabricated box culvert one side reserve two bolt holes on the prefabricated apron of limit culvert, overlap joint in limit culvert arc curb plate one side reserve two circular spacing pinhole on the prefabricated apron of limit culvert be equipped with vertical bolt sleeve pipe with the bolt hole department of being relative on the bracket of middle prefabricated box culvert on the prefabricated apron support bracket of limit culvert arc curb plate with spacing pinhole department of being relative is equipped with the spacing groove, and after the on-the-spot installation of the prefabricated apron of limit culvert was accomplished, cooperate through vertical straight bolt and bolt hole and vertical bolt sleeve pipe, the spacer pin cooperatees with spacing pinhole and spacing groove, accomplishes the fixed of the prefabricated apron of limit culvert and middle prefabricated box culvert and limit culvert arc curb plate.
Furthermore, the limiting pin hole and the limiting groove are densely filled with micro-expansion grouting material.
Further, prefabricated apron size of middle prefabricated box culvert, limit culvert and shield structure section of jurisdiction ring phase-match consider that prefabricated construction assembles factors such as error, curve fit, and middle prefabricated box culvert, limit culvert are than section of jurisdiction ring width little 20mm along the length of line direction, do not set up the wedge volume, assemble the clearance of seam crossing through the adjustment and realize the line type fit.
The utility model has the advantages and positive effects that: compared with the prior art, the utility model discloses a major diameter shield tunnel assembled rail lower structure has synthesized the prefabricated processing of mill, has assembled construction technique and the convenient technology of pouring of concrete, realizes under the rail structure and shield tunnelling synchronous construction, when effectively having promoted under the rail structure site operation efficiency, has guaranteed wholeness and the longitudinal rigidity of assembled rail structure down, improves the construction quality of under the rail structure, improves the interior construction operation environment of tunnel, reduces construction safety risk.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a perspective view of the assembled under-rail structure of the large-diameter shield tunnel of the present invention;
FIG. 2 is a perspective view of the middle prefabricated box culvert of the assembled under-rail structure of the large-diameter shield tunnel of the present invention;
FIG. 3 is a perspective view of a culvert precast cover plate in the assembled under-rail structure of the large-diameter shield tunnel of the present invention;
FIG. 4 is a connecting structure diagram of the culvert precast slabs in the assembled under-rail structure of the large-diameter shield tunnel of the utility model;
FIG. 5 is a perspective view of a culvert arc-shaped side plate in the assembled underrail structure of the large-diameter shield tunnel of the present invention;
FIG. 6 is a vertical view of a culvert arc-shaped side plate prefabricated reinforcement cage in the assembled under-rail structure of the large-diameter shield tunnel of the utility model;
fig. 7 is a mounting plan view of the assembled under-rail structure of the large-diameter shield tunnel of the present invention;
FIG. 8 is a structural diagram of the connection between the arc-shaped side plate of the edge culvert and the middle prefabricated box culvert in the assembled under-rail structure of the large-diameter shield tunnel of the utility model;
fig. 9 is a schematic view of the utility model discloses constitute assembled under-rail structure with backfill screed-coat jointly.
Description of reference numerals:
1: shield segment 2: middle prefabricated box culvert
3: precast side culvert cover plate 4: arc-shaped side plate of edge culvert
4-1: 4-2 of circular arc plate: edge culvert prefabricated cover plate support bracket
5: oblique straight bolt 6: vertical straight bolt
7: and (4) a limiting pin 8: connecting reinforcing bar
9: the steel bar connector 10: bracket
11: bottom arc plate 12 of box culvert: arc support
13: bolt hole 14: limiting pin hole
15: the limiting groove 16: vertical bolt sleeve
17: micro-expansion grouting material 18: steel bar framework
19: hollowed-out backfill holes 20: backfill layer at bottom of tunnel
21: leveling layer
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of 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 therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in figure 1, the major diameter shield tunnel assembled under-rail structure comprises a middle prefabricated box culvert 2 and a side culvert prefabricated cover plate 3 which are prefabricated and formed in a high-precision steel mould, side culvert arc-shaped side plates 4 for cast-in-place construction and a tunnel bottom backfill layer 20.
As shown in fig. 1-2, middle prefabricated box culvert 2 as shield segment 1, adopt the prefabricated production of batch production, assemble the construction in the tunnel, adopt the square structure of the mouth as one speaks, the outside of middle prefabricated box culvert 2 side wall top sets up bracket 10, the box culvert end arc board 11 of middle prefabricated box culvert 2 is arc, is concentric circles and reserves 50mm thick space with shield segment 1 internal surface, 11 lower surface bights of box culvert end arc board set up four arc support 12, its size is 500mm (length) x 300mm (width) x 50mm (height).
As shown in fig. 5-6, the edge culvert arc-shaped side plate 4 comprises an arc-shaped plate 4-1 concentric with the inner surface of the shield segment and an edge culvert precast cover plate supporting bracket 4-2 arranged at the top end of the arc-shaped plate 4-1. Side culvert arc curb plate 4 adopt the mould to build the method construction, built-in framework of steel reinforcement 18 adopts mill's prefabricated cage structure, avoids on-the-spot reinforcement operation, improves the efficiency of construction.
As shown in fig. 3-4, the edge culvert prefabricated cover plate 3 is the same as the shield segment 1, is produced by factory prefabrication, is assembled and constructed in the tunnel, and is lapped and installed on the middle prefabricated box culvert 2 and the edge culvert arc-shaped side plate 4. Two bolt holes 13 are reserved in 2 one sides of prefabricated box culvert in the middle of 3 laps of border culvert, and two circular spacing pinhole 14 are reserved in 4 one sides of border culvert arc curb plate the department of being relative with bolt hole 13 is equipped with vertical bolt sleeve 16 on the bracket 10 of prefabricated box culvert 2 in the middle the prefabricated apron of border culvert arc curb plate 4 support bracket 4-2 on with the department of being relative with spacing pinhole 14 is equipped with spacing groove 15, spacing groove 15 size, position and 3 phase-matches of prefabricated apron of border culvert, consider cast-in-place construction, assemble factors such as error, spacing groove 15 sets up to the cross-sectional form of constituteing for vertically by two semicircles and a rectangle along. After the edge culvert precast cover plate 3 is installed on site, the edge culvert precast cover plate 3 is fixed with the middle precast box culvert 2 and the edge culvert arc-shaped side plate 4 through the matching of the vertical straight bolt 6, the bolt hole 13 and the vertical bolt sleeve 16, and the matching of the limit pin 7, the limit pin hole 14 and the limit groove 15. And micro-expansion grouting materials 17 are filled and compacted in the limiting pin holes 14 and the limiting grooves 15. The limit pin of the edge culvert precast cover plate is phi 32 twisted steel, and micro-expansion concrete filling materials are filled in the limit pin hole to wrap the limit pin of the fixed twisted steel.
As shown in fig. 7-8, the middle prefabricated box culverts 2 are arranged side by side, four groups of oblique straight bolts 5 are longitudinally connected between two adjacent middle prefabricated box culverts 2, and two ends of the top plate of the middle prefabricated box culvert correspond to the reserved bolt hand holes and the embedded bolt sleeves. Prefabricated apron size of middle prefabricated box culvert, side culvert and shield structure section of jurisdiction ring phase-match consider factor such as prefabricated construction assembly error, curve fitting, and middle prefabricated box culvert, side culvert prefabricated apron are than section of jurisdiction ring width by 20mm along the length of line direction, do not set up the wedge volume, assemble the clearance of seam crossing through the adjustment and realize the line type fitting.
Middle prefabricated box culvert 2 is connected through embedded bar connector 9 and connecting reinforcement 8 with 4 bottom connection positions of side culvert arc curb plate, embedded bar connector 9 sets up in box culvert end arc board 11. After the existing installation is finished, a backfill layer 20 at the bottom of the tunnel is poured to fill reserved gaps, the backfill layer 20 at the bottom of the tunnel is a cement mortar filling material filled in the middle hollow-out open hole part of the bottom arc plate, and a proper amount of micro-expanding agent is added into the filling material, so that the middle prefabricated box culvert can be closely attached to the inner surface of the shield segment. The limiting structure formed by the hollow backfill holes 19 of the middle prefabricated box culvert 2 along the longitudinal direction of the tunnel bottom backfill layer 20, the cast-in-place edge culvert arc-shaped side plate 4 and the rail lower structure top backfill leveling layer 21 jointly form an assembly type rail lower structure longitudinal connection system, and the longitudinal overall stability of the rail lower structure is improved.
A construction method of a large-diameter shield tunnel assembled type under-rail structure comprises the following steps:
s1: adopt prefabricated box culvert in the middle of the prefabricated production of high accuracy mould and the prefabricated apron of border culvert in mill, middle prefabricated box culvert and the prefabricated apron longitudinal length of border culvert are unanimous with shield structure section of jurisdiction ring width or are less than shield structure section of jurisdiction ring width, and middle prefabricated box culvert roof and bracket, the prefabricated apron top surface of border culvert set up the rough surface that unsmooth degree of depth is not less than 4 mm.
S2: a cage type steel reinforcement cage with side culvert and arc side plates is prefabricated and processed in a factory, and 4-5 ring shield segment widths are taken along the longitudinal length of the steel reinforcement cage and are matched with a cast-in-place concrete template.
S3: in the shield tunneling process, a middle prefabricated box culvert under a rail is synchronously assembled after shield segments, the middle prefabricated box culvert is installed in a matched mode with the segment ring width, joints are assembled in the annular direction of the middle prefabricated box culvert and the shield segment ring seams in an aligned mode, and the joints are assembled in the annular direction and are connected through inclined bolts.
S4: according to the shield structure machine equipment configuration condition, the in-situ construction condition in the tunnel, after the completion distance is assembled in advance to the middle prefabricated box culvert and is not less than the prefabricated steel reinforcement cage length of side culvert arc curb plate, the side culvert arc curb plate steel reinforcement cage is installed, the middle prefabricated box culvert and the side culvert arc curb plate connection position connection reinforcing bar are executed, and side culvert arc curb plate concrete is poured.
S5: after the arc-shaped side plate concrete of the edge culvert reaches the strength, the prefabricated side plate of the edge culvert is installed on the bracket of the middle prefabricated box culvert and the arc-shaped side plate support by adopting a mortar sitting method, and is connected with the middle prefabricated box culvert and the arc-shaped side plate of the edge culvert through connecting bolts and limiting pins.
S6: filling materials are poured into the hollow-out position of the center of the bottom arc plate of the middle prefabricated box culvert, the gap between the bottom arc plate of the middle prefabricated box culvert and the contact surface of the shield segment is filled, a backfill layer at the bottom of the tunnel is formed, a reinforcing mesh is placed in the backfill layer at the bottom of the tunnel, and the middle prefabricated box culvert is longitudinally connected into a whole.
S7: and repeating the steps S3-S6, completing installation of the assembled under-rail structure in the tunnel, constructing a leveling layer in a cast-in-place mode, cleaning sundries on the top surface Mao Caomian of the under-rail structure before concrete pouring of the leveling layer, and arranging a reinforcing mesh in the leveling layer to improve the integrity of the under-rail structure.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a major diameter shield tunnel assembled track is structure down which characterized in that: backfill layer at the bottom of prefabricated box culvert, the prefabricated apron of limit culvert, limit culvert arc curb plate and tunnel in the middle of including the both sides wall top outside of middle prefabricated box culvert all is equipped with the bracket, the arc board is convex at the bottom of the box culvert of middle prefabricated box culvert, is concentric circles with shield section of jurisdiction internal surface, reserve the space between arc board and the shield section of jurisdiction internal surface at the bottom of the box culvert seted up the fretwork backfill hole on the arc board at the bottom of the box culvert the both sides of middle prefabricated box culvert are cast-in-place construction respectively limit culvert arc curb plate, the lap joint of the prefabricated apron of limit culvert is installed on middle prefabricated box culvert and limit culvert arc curb plate, backfill layer sets up at the back filling hole of middle prefabricated box culvert at the bottom of the tunnel, fills and reserves the space.
2. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 1, wherein: the middle prefabricated box culvert is a plurality of and is arranged side by side, and the adjacent two middle prefabricated box culverts are connected by oblique straight bolts.
3. The large-diameter shield tunnel fabricated underrail structure of claim 1 or 2, wherein: the edge culvert arc-shaped side plate comprises a circular arc-shaped plate concentric with the inner surface of the shield segment and an edge culvert prefabricated cover plate supporting bracket arranged at the top end of the circular arc-shaped plate, and a steel reinforcement framework is arranged in the edge culvert arc-shaped side plate.
4. The assembled underrail structure of large-diameter shield tunnel according to claim 1, wherein: the middle prefabricated box culvert adopts a square structure.
5. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 3, wherein: arc supports are arranged at four corners of the lower surface of the arc plate at the bottom of the box culvert, and the thickness of a gap reserved between the arc plate at the bottom of the box culvert and the inner surface of the shield segment is the same as the height of the arc supports.
6. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 1, wherein: the middle prefabricated box culvert and the edge culvert prefabricated cover plates are factory prefabricated products and are assembled and constructed in the tunnel.
7. The assembled underrail structure of large-diameter shield tunnel according to claim 3, wherein: the box culvert bottom arc plate of the middle prefabricated box culvert is connected with the arc plate connecting part of the side culvert arc side plate through the embedded steel bar connector and the connecting steel bar, and the embedded steel bar connector is arranged in the box culvert bottom arc plate.
8. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 1, wherein: the overlap joint in middle prefabricated box culvert one side the prefabricated apron of limit culvert is last to reserve has the bolt hole, overlap joint in limit culvert arc curb plate one side the prefabricated apron of limit culvert is last to reserve has circular spacing pinhole the relative department with the bolt hole on the bracket of middle prefabricated box culvert is equipped with vertical bolt sleeve pipe the prefabricated apron of limit culvert arc curb plate of limit culvert on supporting the bracket with the relative department of spacing pinhole is equipped with the spacing groove, and the on-the-spot installation of the prefabricated apron of limit culvert is accomplished the back, cooperatees through vertical straight bolt and bolt hole and vertical bolt sleeve pipe, and the spacer pin cooperatees with spacing pinhole and spacing groove, accomplishes the fixed of the prefabricated apron of limit culvert and middle prefabricated box culvert and limit culvert arc curb plate.
9. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 8, wherein: and micro-expansion grouting materials are filled in the limiting pin holes and the limiting grooves.
10. The assembled type under-rail structure of the large-diameter shield tunnel according to claim 1, wherein: the sizes of the middle prefabricated box culvert and the side culvert prefabricated cover plates are matched with shield segments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221781304.2U CN217999601U (en) | 2022-07-11 | 2022-07-11 | Major diameter shield tunnel assembled track down structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221781304.2U CN217999601U (en) | 2022-07-11 | 2022-07-11 | Major diameter shield tunnel assembled track down structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217999601U true CN217999601U (en) | 2022-12-09 |
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ID=84315646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221781304.2U Active CN217999601U (en) | 2022-07-11 | 2022-07-11 | Major diameter shield tunnel assembled track down structure |
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| CN (1) | CN217999601U (en) |
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2022
- 2022-07-11 CN CN202221781304.2U patent/CN217999601U/en active Active
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