CN210829276U - Shield does not have burden ring and begins structure - Google Patents

Abstract

The utility model belongs to the technical field of the shield constructs the construction, a shield constructs no burden ring initial structure is disclosed, including counterforce frame subassembly, first steel ring and second steel ring. In the counterforce frame component, the ground beam structure is arranged in the starting shaft, the counterforce frame is adjustably arranged on the ground beam structure, one end of the cross brace is detachably connected with the counterforce frame, and the other end of the cross brace abuts against the structure wall. The first steel ring comprises a first steel ring body, a first connecting ring and a second connecting ring, wherein the first connecting ring and the second connecting ring are respectively arranged at two ends of the first steel ring body. The second steel ring comprises a second steel ring body, and a third connecting ring and a fourth connecting ring which are respectively arranged at two ends of the second steel ring body. The first ends of the two steel rings are fixedly connected, the second end of the first steel ring is connected with one side of the reaction frame, which is back to the cross brace, and the second end of the second steel ring is connected with a push rod of the shield tunneling machine; the outer diameters of the four connecting rings are equal and equal to the outer diameter of the reinforced concrete ring for construction. In order to reserve a vertical material conveying channel in the starting well, the matched equipment and the starting process are redesigned.

Description

Shield does not have burden ring and begins structure

Technical Field

The utility model relates to a shield constructs construction technical field, especially relates to a shield constructs no burden ring initial structure.

Background

When the shield is started and constructed, the situation that no unearthing port exists behind the starting well exists, the shield machine starts in the underground excavation space, and only the starting vertical shaft can be used for completing the underground assembly of the shield machine and material transportation during construction. After the shield machine and the reaction frame are assembled, the starting well is basically occupied. If the conventional negative ring assembly process is adopted for starting, the negative ring pipe piece blocks a vertical channel for conveying materials in a starting vertical shaft, so that the materials such as dregs excavated by the shield machine, pipe pieces required by construction, guide rails, sleepers and the like cannot be conveyed.

Aiming at the problems, the conventional construction method comprises the steps of excavating a section of tunnel by adopting a mining method, wherein the inner diameter of the tunnel is larger than the outer diameter of a shield machine, and a platform for moving and starting the shield machine is constructed in the tunnel. After the shield machine is assembled in the starting well, the shield machine is moved to a guide table in the tunnel to be assembled at the position of a positive 1 ring, and a reaction frame is arranged at the tunnel portal, so that the purpose of reserving a material transportation channel in the starting well is achieved. However, the construction of the mine-method tunnel is carried out under the working conditions of no ground precipitation and sand-gravel bottom excavation, and the construction risk is high. In other methods, only the A piece (lower half ring) of the negative ring segment is assembled, the upper space is reserved to be used as a material vertical transportation channel, but for an anhydrous sandy gravel stratum, the thrust is generally about 80% of the design thrust when the shield machine is propelled in the stratum. If semi-ring assembly is adopted, 50% of main thrust oil cylinders of the shield tunneling machine cannot participate in propulsion due to no action point, and thrust cannot meet construction requirements.

Therefore, aiming at the working condition of no underground precipitation control and large propelling force required by the anhydrous sandy gravel stratum, other processes are required to meet the existing working condition and a vertical conveying channel can be reserved in the starting vertical shaft.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a shield constructs does not have burden ring initial structure can constantly reserve out vertical material transport space in the shaft of starting at the shield structure machine antedisplacement in-process.

A shield no-negative-loop originating structure, comprising:

the reaction frame assembly comprises a ground beam structure, a reaction frame and a plurality of cross braces, the ground beam structure is arranged in the starting shaft, the reaction frame is adjustably arranged on the ground beam structure, one end of each cross brace is detachably connected with the reaction frame, and the other end of each cross brace is configured to abut against a structural wall;

the first steel ring comprises a first steel ring body, a first connecting ring and a second connecting ring, the first connecting ring is detachably arranged at the first end circumference of the first steel ring body, and the second connecting ring is arranged at the second end circumference of the first steel ring body;

the second steel ring comprises a second steel ring body, a third connecting ring and a fourth connecting ring, the third connecting ring is detachably arranged at the circumferential direction of the first end of the second steel ring body, and the fourth connecting ring is arranged at the circumferential direction of the second end of the second steel ring body;

the first end of the first steel ring is fixedly connected with the first end of the second steel ring, the second end of the first steel ring is connected with one side, back to the cross brace, of the reaction frame, and the second end of the second steel ring is configured to be connected with a push rod of a main push oil cylinder of the shield tunneling machine;

the first connecting ring, the second connecting ring, the third connecting ring and the fourth connecting ring have the same outer diameter and are the same as the outer diameter of the reinforced concrete ring for construction.

Further, the first steel ring comprises three first A-shaped tube pieces, a first B1-shaped tube piece, a first B2-shaped tube piece and a first C-shaped tube piece;

the second steel ring comprises three second A-shaped pipe pieces, one second B1-shaped pipe piece, one second B2-shaped pipe piece and one second C-shaped pipe piece.

Further, the air conditioner is provided with a fan,

the first A-shaped pipe comprises a first A-shaped pipe body, a first fixed end plate and a first detachable end plate, wherein the first fixed end plate and the first detachable end plate are respectively arranged at two arc-shaped ends of the first A-shaped pipe body;

the first B1 type pipe comprises a first B1 type pipe body, a second fixed end plate and a second detachable end plate which are respectively arranged at two arc-shaped ends of the first B1 type pipe body;

the first B2 type pipe comprises a first B2 type pipe body, a third fixed end plate and a third detachable end plate which are respectively arranged at two arc-shaped ends of the first B2 type pipe body;

the first C-shaped pipe comprises a first C-shaped pipe body, a fourth fixed end plate and a fourth detachable end plate, wherein the fourth fixed end plate and the fourth detachable end plate are respectively arranged at two arc-shaped ends of the first C-shaped pipe body;

the first A-type pipe sheet body, the first B1-type pipe sheet body, the first B2-type pipe sheet body and the first C-type pipe sheet body are spliced to form the first steel ring body, the first fixed end plate, the second fixed end plate, the third fixed end plate and the fourth fixed end plate form the second connecting ring, and meanwhile, the first detachable end plate, the second detachable end plate, the third detachable end plate and the fourth detachable end plate form the first connecting ring.

Further, the air conditioner is provided with a fan,

the second A-shaped pipe piece comprises a second A-shaped pipe piece body, a fifth fixed end plate and a fifth detachable end plate, wherein the fifth fixed end plate and the fifth detachable end plate are respectively arranged at two arc-shaped ends of the second A-shaped pipe piece body;

the second B1 type tube sheet comprises a second B1 type tube sheet body, a sixth fixed end plate and a sixth detachable end plate which are respectively arranged at two arc-shaped ends of the second B1 type tube sheet body;

the second B2 type pipe piece comprises a second B2 type pipe piece body, a seventh fixed end plate and a seventh detachable end plate which are respectively arranged at two arc-shaped ends of the second B2 type pipe piece body;

the second C-shaped pipe piece comprises a second C-shaped pipe piece body, and an eighth fixed end plate and an eighth detachable end plate which are respectively arranged at two arc ends of the second C-shaped pipe piece body;

the second A type pipe sheet body, second B1 type pipe sheet body, second B2 type pipe sheet body and the concatenation of second C type pipe sheet body forms the second steel ring body, the fifth fixed end plate, the sixth fixed end plate the seventh fixed end plate with the eighth fixed end plate forms the fourth connecting ring, simultaneously the end plate can be dismantled to the fifth the end plate can be dismantled to the sixth the end plate can be dismantled to the seventh can dismantle the end plate with the eighth can be dismantled the end plate forms the third connecting ring.

Further, the first fixed end plate and the first a-type tube sheet body are welded into a whole, the second fixed end plate and the first B1-type tube sheet body are welded into a whole, the third fixed end plate and the first B2-type tube sheet body are welded into a whole, and the fourth fixed end plate and the first C-type tube sheet body are welded into a whole;

the fifth fixed end plate and the second A-shaped pipe sheet body are welded into a whole, the sixth fixed end plate and the second B1-shaped pipe sheet body are welded into a whole, the seventh fixed end plate and the second B2-shaped pipe sheet body are welded into a whole, and the eighth fixed end plate and the second C-shaped pipe sheet body are welded into a whole.

Further, the first detachable end plate is bolted to the first a-type pipe sheet body, the second detachable end plate is bolted to the first B1-type pipe sheet body, the third detachable end plate is bolted to the first B2-type pipe sheet body, and the fourth detachable end plate is bolted to the first C-type pipe sheet body;

the fifth detachable end plate is connected with the second A-shaped pipe sheet body through bolts, the sixth detachable end plate is connected with the second B1-shaped pipe sheet body through bolts, the seventh detachable end plate is connected with the second B2-shaped pipe sheet body through bolts, and the eighth detachable end plate is connected with the second C-shaped pipe sheet body through bolts.

Further, the first a-type pipe piece body, the first B1-type pipe piece body, the first B2-type pipe piece body, the first C-type pipe piece body, the second a-type pipe piece body, the second B1-type pipe piece body, the second B2-type pipe piece body, and the second C-type pipe piece body are provided with seventh connecting holes at two arc ends thereof, so as to realize the fixed connection between the first steel ring and the second steel ring.

Further, the ground beam structure includes first ground beam and the second ground beam that parallel and interval set up, the reaction frame includes the main frame, the main frame includes left stand, right stand, entablature and bottom end rail, left side stand position set firmly adjustably on the first ground beam, right side stand position set firmly adjustably on the second ground beam, the entablature with the bottom end rail is all located left side stand with between the right stand, the bottom end rail is in left side stand with the mounted position on the right stand is adjustable.

Furthermore, the reaction frame also comprises a subframe fixedly attached to one side of the main frame, and the subframe comprises a first splayed structure and a second splayed structure which are oppositely arranged;

the first splayed structure comprises a first cross beam, one end of the first cross beam is provided with a first left oblique beam, the other end of the first cross beam is provided with a first right oblique beam, the first cross beam is attached to the upper cross beam, one end, far away from the first cross beam, of the first left oblique beam is fixed on the left upright post, and one end, far away from the first cross beam, of the first right oblique beam is fixed on the right upright post;

the second splayed structure comprises a second cross beam, a second left oblique beam is arranged at one end of the second cross beam, a second right oblique beam is arranged at the other end of the second cross beam, the second cross beam is attached to the lower cross beam, the second left oblique beam is far away from one end of the second cross beam and adjustably fixed to the left stand column, and the second right oblique beam is far away from one end of the second cross beam and adjustably fixed to the right stand column.

Further, the sub-frame further includes:

the left lower upright post is detachably and fixedly arranged on the left upright post and is positioned below the second left oblique beam, the upper end surface of the left lower upright post is attached to the lower end surface of the second left oblique beam, and the lower end of the left lower upright post is detachably and fixedly arranged on the first ground beam;

the right lower upright post is detachably and fixedly arranged on the right upright post and is positioned below the second right oblique beam, the upper end surface of the right lower upright post is attached to the lower end surface of the second right oblique beam, and the lower end of the right lower upright post is detachably and fixedly arranged on the second ground beam;

the left wedge-shaped block is detachably and fixedly arranged on the left upright post, the upper end face of the left wedge-shaped block is attached to the lower end face of the first left oblique beam, and the lower end face of the left wedge-shaped block is attached to the upper end face of the second left oblique beam;

the right wedge-shaped block is detachably and fixedly arranged on the right upright post, the upper end surface of the right wedge-shaped block is attached to the lower end surface of the first right oblique beam, and the lower end surface of the right wedge-shaped block is attached to the upper end surface of the second right oblique beam;

the left upper upright post is detachably and fixedly arranged on the left upright post and is positioned above the first left oblique beam, and the lower end surface of the left upper upright post is attached to the upper end surface of the first left oblique beam;

and the upper right upright post is detachably and fixedly arranged on the right upright post and is positioned above the first right oblique beam, and the lower end surface of the upper right upright post is attached to the upper end surface of the first right oblique beam.

Compared with the prior art, the utility model provides a shield constructs does not have burden ring and begins to construct in the structure, first steel ring and second steel ring have the structure of go-between for both ends, first go-between, the second go-between, the external diameter of third go-between and fourth go-between equals, and all the external diameter with follow-up construction reinforced concrete ring is the same, the biggest external diameter of first steel ring and the biggest external diameter of second steel ring equal and all the same with reinforced concrete ring's external diameter promptly, guarantee to assemble back steel ring axis and tunnel design axis coincidence and can with the push rod cooperation of main thrust cylinder, play the burden ring effect in the tradition technology of initiating. Furthermore, the first connecting ring is detachably connected with the first steel ring body, the third connecting ring is detachably connected with the second steel ring body, the first connecting ring and the third connecting ring on the first steel ring and the second steel ring are respectively detached before the first steel ring and the second steel ring move forwards, and therefore when the first steel ring and the second steel ring move forwards, the first steel ring body and the second steel ring body with smaller outer diameters cannot interfere with the sealing brush of the shield tail, the sealing brush is not damaged, and special starting technological requirements are met. In addition, the reaction frame comprises a main frame and an auxiliary frame, and is high in overall strength and good in bending resistance.

The utility model discloses use and remain the perpendicular transport corridor of interior material of well that starts as the target, improve shield structure technology to adopt above-mentioned shield structure to have no burden ring initial structure, change traditional fixed reaction frame into portable reaction frame subassembly, utilize shield structure machine owner to push away hydro-cylinder and hoisting accessory and drive first steel ring, second steel ring and reaction frame and move forward, after reaction frame moves forward, reaction frame and the space between the well structure wall of starting can satisfy the perpendicular transportation requirement of material.

Drawings

FIG. 1 is a schematic diagram of a reaction frame assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first ground beam according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a main frame according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a subframe according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a first steel ring and a second steel ring provided by an embodiment of the present invention;

FIG. 6 is a schematic assembly diagram of a first steel ring and a second steel ring according to an embodiment of the present invention;

FIG. 7 is a schematic assembly view of the first steel ring and the second steel ring after the first connecting ring and the third connecting ring are removed according to the embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first a-shaped segment according to an embodiment of the present invention;

fig. 9 is an exploded view of a first type a segment provided in accordance with an embodiment of the present invention;

FIG. 10 is a flow chart of a shield non-negative loop originating process provided by an embodiment of the present invention;

FIG. 11 is a schematic view of a shield tunneling machine and a counterforce frame assembly according to an embodiment of the invention;

FIG. 12 is a schematic diagram of a splicing machine provided by the embodiment of the invention for splicing a first steel ring;

FIG. 13 is a schematic view of a first steel ring being pushed back to a reaction frame according to an embodiment of the present invention;

FIG. 14 is a schematic view of the assembling machine for assembling a second steel ring provided by the embodiment of the invention;

fig. 15 is a schematic view of the shield tunneling machine according to the embodiment of the present invention moving forward for the first time;

FIG. 16 is a schematic view of the first and third connecting rings removed in accordance with an embodiment of the present invention;

FIG. 17 is a schematic view of the first forward movement of the first steel ring, the second steel ring and the reaction frame according to the embodiment of the present invention;

fig. 18 is a schematic diagram of secondary forward movement of the shield tunneling machine according to the embodiment of the present invention;

FIG. 19 is a schematic view of the second forward movement of the first steel ring, the second steel ring and the reaction frame according to the embodiment of the present invention;

fig. 20 is a schematic view of a shield tunneling machine three forward movements according to an embodiment of the present invention;

FIG. 21 is a schematic view of the first steel ring, the second steel ring and the reaction frame of the present invention with three forward movements;

fig. 22 is a schematic diagram of a shield tunneling machine moving four times forward according to an embodiment of the present invention;

FIG. 23 is a schematic diagram of the four forward movements of the first steel ring, the second steel ring and the reaction frame according to the embodiment of the present invention;

fig. 24 is a schematic diagram of a shield tunneling machine according to an embodiment of the present invention, as moved five times forward;

FIG. 25 is a schematic diagram illustrating five forward movements of the first steel ring, the second steel ring and the reaction frame according to an embodiment of the present invention;

fig. 26 is a schematic diagram of a shield tunneling machine according to an embodiment of the present invention, moving forward six times;

fig. 27 is a schematic diagram of six forward movements of the first steel ring, the second steel ring and the reaction frame according to the embodiment of the present invention.

Reference numerals:

100-a shield machine; 110-sealing brush; 200-a reaction frame assembly; 300-a first ring of reinforced concrete rings;

1-a ground beam structure; 11-a first ground beam; 12-a second ground beam;

111-a first H-section steel; 112-a first fixation plate; 1121 — first connection hole; 113-first rib plate; 114-second web;

2-a reaction frame; 21-a main frame; 22-a subframe; 3-horizontal bracing; 4-embedding the structural part;

211-left upright; 2111-third H-section steel; 2112-fifth gusset; 2113-left stud flange; 2114-first flange; 2115-second flange; 2116-fifth connection hole; 212-right upright; 2121-fourth H-section steel; 2122-sixth rib plate; 2123-right column flange; 2124-third flange; 2125-fourth flange; 2126-sixth connection hole; 213-upper beam; 214-lower beam;

221-a first splayed structure; 2211-a first beam; 2212-first left sloping; 2213-first right sloping;

222-a second splayed configuration; 2221-a second beam; 2222-second left sloping beam; 2223-second right sloping beam;

223-left lower column; 224-a left wedge; 225-upper left column; 2231-left lower column flange;

226-right lower column; 227-a right wedge block; 228-upper right column; 2261-right lower stud flange;

5-a first steel ring; 51-a first steel ring body; 52-first connecting ring; 53-a second connecting ring;

6-a second steel ring; 61-a second steel ring body; 62-a third connecting ring; 63-a fourth connecting ring;

7-a first type a segment; 71-a first type a tube sheet body; 72-first fixed end plate; 73-a first removable end panel;

8-first B1 type segment; 9-first B2 type segment; 10-a first C-shaped segment;

7' -a second type a segment; 8' -second B1 type segment; 9' -second B2 type tubesheet; 10' -a second C-shaped segment;

20-a seventh connection hole; 30-eighth connection hole; and 40-hoisting holes.

Detailed Description

The embodiment provides a shield structure without a negative ring, and solves the problem that a vertical material conveying space in an originating shaft is small when the shield structure originates. Specifically, the shield grommetless launch structure may optionally include a reaction frame assembly 200 (see fig. 1), a first steel ring 5, and a second steel ring 6 (see fig. 5 and 6).

Referring to fig. 1, the reaction frame assembly 200 may optionally include a ground beam structure 1, a reaction frame 2, and a plurality of wales 3. The ground beam structure 1 is fixedly arranged in the starting shaft. The reaction frame 2 is fixed to the ground beam structure 1 in a position-adjustable manner. One end of the wale 3 is detachably connected to the reaction frame 2, and the other end is configured to abut against a structural wall. One side of the reaction frame 2, which is back to the cross brace 3, is connected with a push rod of a main push oil cylinder of the shield tunneling machine through a first steel ring 5 and a second steel ring 6. Namely, the first steel ring 5 and the second steel ring 6 are arranged between the shield tail of the shield tunneling machine and the reaction frame 2 and are used as force transmission media between the shield tunneling machine and the reaction frame 2.

Referring to fig. 5, the first steel ring 5 includes a first steel ring body 51, a first connection ring 52 provided at a first end circumference of the first steel ring body 51, and a second connection ring 53 provided at a second end circumference of the first steel ring body 51. The second steel ring 6 includes a second steel ring body 61, a third connection ring 62 provided in a first end circumferential direction of the second steel ring body 61, and a fourth connection ring 63 provided in a second end circumferential direction of the second steel ring body 61.

When the shield machine is assembled before starting, the first steel ring 5 and the second steel ring 6 are assembled between a main thrust cylinder and a reaction frame 2 of the shield machine. Specifically, the second end of the first steel ring 5 is fixedly connected with one side of the reaction frame 2, which is back to the cross brace 3, and the second end and the side are preferably connected by spot welding, so that the connection is stable and the construction is convenient; the first end of the second steel ring 6 and the first end of the first steel ring 5 are spliced and fixedly connected (specifically, the first steel ring body 51 and the second steel ring body 61 are fixedly connected, and no connecting structure is arranged between the first connecting ring 52 and the third connecting ring 62); the push rod of the main push oil cylinder is propped against the second end of the second steel ring 6.

When starting, the push rod of the main push oil cylinder pushes backwards, and the shield machine moves forwards under the reverse thrust of the second steel ring 6, the first steel ring 5 and the counterforce frame component 200. After the shield machine moves forward by a certain distance, the first steel ring 5 and part of the second steel ring 6 are exposed out of the shield tail. Then, the connecting structure of the reaction frame 2 and the first ground beam 11 is removed, the reaction frame 2 is lifted by a lifting device (not shown) above a well head of the starting vertical shaft (the reaction frame 2 leaves the ground), then a main thrust cylinder of the shield tunneling machine retracts, and the main thrust cylinder and the lifting device are matched together to move the reaction frame 2, the first steel ring 5 and the second steel ring 6 forwards together. And finally, fixing the reaction frame 2 on the ground beam structure 1 again, and replacing or lengthening the cross brace 3 to enable the cross brace 3 to be propped against the structure wall again to prepare for the shield tunneling machine to move forwards again. At this point, one forward movement of the shield tunneling machine is completed, and simultaneously the reaction frame 2, the first steel ring 5 and the second steel ring 6 also move forward once, so that a part of vertical material conveying channels are added behind the reaction frame 2. Repeating the process, the shield machine moves forwards, the reaction frame 2, the first steel ring 5 and the second steel ring 6 move forwards subsequently, and a larger vertical material conveying channel is reserved continuously.

Specifically, referring to fig. 1, the ground beam includes a first ground beam 11 and a second ground beam 12 which are spaced apart and arranged in parallel. Before starting, the ground beam structure 1 is installed while supporting the shield machine starting block (not shown in the drawings) in the starting shaft. Wherein the first and second ground beams 11 and 12 are respectively located at both sides of the engine base.

Referring to fig. 2, the first floor beam 11 includes a plurality of first H-shaped steels 111 and a first fixing plate 112. The plurality of first H-shaped steels 111 are arranged side by side and fixed on the embedded structural member 4 in the starting shaft, and are preferably connected by welding, and further fixed by a first rib plate 113. The first fixing plate 112 is welded above the plurality of first H-shaped steels 111, and the first fixing plate and the second H-shaped steels are fixed by the second rib plate 114, so that the whole structure is stable and high in strength. Similarly, the second ground beam 12 includes a plurality of second H-section steels and second fixing plates. And the plurality of second H-shaped steels are arranged side by side and fixed on the embedded structural member 4 in the starting vertical shaft, the second H-shaped steels and the embedded structural member are preferably connected by welding, and a third rib plate is further added for fixing. The second fixed plate is welded above the second H-shaped steels, and the fourth rib plate is arranged between the second fixed plate and the second H-shaped steels, so that the whole structure is stable and the strength is high. In this embodiment, four first H-section steels 111 and four second H-section steels are provided. The reaction frame 2 comprises a main frame 21 and an auxiliary frame 22 attached to one side of the main frame 21, adopts a double-layer structure, and has high rigidity and strength of the whole structure.

Referring to fig. 3, the main frame 21 has a similar structure to that of a conventional general reaction frame, and includes a left column 211, a right column 212, an upper cross member 213, and a lower cross member 214. The left upright post 211 is adjustably fixed on the first ground beam 11, and the right upright post 212 is adjustably fixed on the second ground beam 12, so as to adjust the position of the main frame 21 on the ground beam structure 1. The upper cross beam 213 and the lower cross beam 214 are both located between the left upright post 211 and the right upright post 212, the mounting positions of the lower cross beam 214 on the left upright post 211 and the right upright post 212 are adjustable, the space between the upper cross beam 213 and the lower cross beam 214 can be adjusted, the passing requirement of a matched trolley in shield construction is guaranteed, and the lower cross beam 214 does not interfere with an engine starting base when the reaction frame 2 moves and does not interfere with a segment lifted for the second time.

In this embodiment, the left upright post 211 is formed by splicing four third H-shaped steels 2111 side by side, and fifth rib plates 2112 are welded in the third H-shaped steels 2111, so that the strength of the whole structure is improved. The right upright 212 is formed by splicing four fourth H-shaped steels 2121 side by side, and a sixth rib plate 2122 is welded in the fourth H-shaped steel 2121, so that the strength of the whole structure is ensured. The upper cross member 213 and the lower cross member 214 are made of steel plates.

Further, a plurality of first connection holes 1121 (see fig. 2) are formed at intervals on the first fixing plate 112, and a left upright flange 2113 at the bottom of the left upright 211 is connected to one or several adjacent first connection holes 1121 through bolts. Along with the continuous antedisplacement of whole reaction frame 2, left stand 211 can be connected with different first connecting hole 1121, realizes that the fixed position of left stand 211 on first grade beam 11 is adjustable. The first connection holes 1121 are preferably formed in two rows, and the two rows of the first connection holes 1121 are respectively disposed on two sides of the first fixing plate 112, so that the connection is more stable.

Similarly, a plurality of second connecting holes are also spaced apart from each other on the second fixing plate, and the right upright flange 2123 at the bottom of the right upright 212 is connected to one or several adjacent second connecting holes by bolts. With the continuous forward movement of the whole reaction frame 2, the right upright 212 can be connected with different second connecting holes, so that the fixed position of the right upright 212 on the second ground beam 12 can be adjusted. The second connecting holes are preferably arranged in two rows, and the two rows of second connecting holes are respectively arranged on two sides of the second fixing plate, so that the connection is more stable.

With continued reference to fig. 3, the upper portion of the left upright 211 is provided with a first flange 2114 and the lower portion is provided with a second flange 2115. The upper portion of right upright 212 is provided with a third flange 2124 and the lower portion is provided with a fourth flange 2125. The third flange 2124 is opposite to the first flange 2114, and is detachably connected to the connecting flanges at the two ends of the upper beam 213. The fourth flange 2125 and the second flange 2115 are disposed opposite to each other, and are detachably connected to the connecting flanges at the two ends of the lower beam 214, respectively. Specifically, a plurality of third connection holes are formed in the second flange 2115 at intervals, and a plurality of fourth connection holes are formed in the fourth flange 2125 at intervals, so that fine adjustment of the installation position of the lower cross beam 214 is realized.

Further, referring to fig. 4, the sub-frame 22 may optionally include a first chevron structure 221 and a second chevron structure 222. The first splayed structure 221 is disposed above the main frame 21 and has an opening facing downward. The second splayed structure 222 is disposed below the main frame 21, and has an opening facing upward. The first splayed structure 221 and the second splayed structure 222 are oppositely arranged, so that the whole structure is symmetrical, and the stress is uniform and stable.

The first chevron structure 221 includes a first cross beam 2211, a first left stringer 2212, and a first right stringer 2213. A first left cant beam 2212 is disposed at one end of the first cross beam 2211, and a first right cant beam 2213 is disposed at the other end of the first cross beam 2211. The cross section of the first cross beam 2211 is preferably trapezoidal, the first left oblique beam 2212 and the first right oblique beam 2213 are respectively welded and fixed with the two inclined surfaces of the first cross beam 2211, and the whole structural strength and rigidity are high.

Similarly, the second splay 222 includes a second cross beam 2221, a second left cant beam 2222, and a second right cant beam 2223. A second left oblique beam 2222 is provided at one end of the second cross beam 2221, and a second right oblique beam 2223 is provided at the other end of the second cross beam 2221. The cross section of the second cross beam 2221 is also preferably trapezoidal, and the second left oblique beam 2222 and the second right oblique beam 2223 are respectively welded and fixed with the two inclined surfaces of the second cross beam 2221, so that the whole structural strength and rigidity are high.

Specifically, the end of the first left oblique beam 2212 away from the first cross beam 2211 is fixed to the left upright 211, and the end of the first right oblique beam 2213 away from the first cross beam 2211 is fixed to the right upright 212. The first beam 2211 is attached to the upper beam 213. Because the upper cross beam 213 is made of steel plate, it is inconvenient to provide a connection hole thereon, and during actual construction, in order to improve structural strength and stability, the first cross beam 2211 and the upper cross beam 213 can be connected by welding.

Similarly, the end of the second left oblique beam 2222 away from the second cross beam 2221 is adjustably fixed to the left column, and the end of the second right oblique beam 2223 away from the second cross beam 2221 is adjustably fixed to the right column 212. The second cross member 2221 is attached to the lower cross member 214, the lower cross member 214 is also made of steel plate, and the second cross member 2221 is connected to the lower cross member 214 by welding.

Further, the sub-frame 22 may also optionally include a left lower upright 223, a right lower upright 226, a left wedge block 224, a right wedge block 227, a left upper upright 225, and a right upper upright 228. Wherein:

the left lower upright 223 is detachably fixed on the left upright 211 and is located below the second left oblique beam 2222, the upper end surface of the left lower upright 223 is attached to the lower end surface of the second left oblique beam 2222, and the lower end of the left lower upright 223 is detachably fixed on the first ground beam 11.

The right lower vertical column 226 is detachably fixed on the right vertical column 212 and located below the second right oblique beam 2223, the upper end surface of the right lower vertical column 226 is attached to the lower end surface of the second right oblique beam 2223, and the lower end of the right lower vertical column 226 is detachably fixed on the second ground beam 12.

The left wedge-shaped block 224 is detachably and fixedly arranged on the left upright post 211, the upper end face of the left wedge-shaped block 224 is attached to the lower end face of the first left oblique beam 2212, and the lower end face of the left wedge-shaped block 224 is attached to the upper end face of the second left oblique beam 2222.

The right wedge 227 is detachably and fixedly arranged on the right upright post 212, the upper end surface of the right wedge 227 is attached to the lower end surface of the first right oblique beam 2213, and the lower end surface of the right wedge 227 is attached to the upper end surface of the second right oblique beam 2223.

The left upper column 225 is detachably fixed on the left column 211 and located above the first left oblique beam 2212, and the lower end surface of the left upper column 225 is attached to the upper end surface of the first left oblique beam 2212.

The right upper column 228 is detachably fixed on the right column 212 and located above the first right oblique beam 2213, and the lower end surface of the right upper column 228 is attached to the upper end surface of the first right oblique beam 2213.

The left lower column 223, the left wedge-shaped block 224 and the left upper column 225 fix the first left oblique beam 2212 and the second left oblique beam 2222, so that the strength and the rigidity of the whole structure are improved. The left lower upright column 223, a part of the second left oblique beam 2222, the left wedge-shaped block 224, a part of the first left oblique beam 2212 and the left upper upright column 225 jointly form a left auxiliary upright column, and the left auxiliary upright column and the left upright column 211 form a double-layer structure, so that the stress capacity of the reaction frame 2 in the transverse direction and the vertical direction is improved. The right lower upright 226, the right wedge block 227 and the right upper upright 228 fix the first right oblique beam 2213 and the second right oblique beam 2223, and the strength and rigidity of the whole structure are improved. Meanwhile, the right lower upright post 226, a part of the second right oblique beam 2223, the right wedge-shaped block 227, a part of the first right oblique beam 2213 and the right upper upright post 228 form a right auxiliary upright post together, and form a double-layer structure with the right upright post 212, so that the stress capacity of the reaction frame 2 in the transverse direction and the vertical direction is improved.

Further, the left lower column 223 and the second left oblique beam 2222, the left wedge block 224 and the first left oblique beam 2212, and the left upper column 225 and the first left oblique beam 2212 are all in inclined surface fit, so that the bending strength of the whole reaction frame 2 is improved. Similarly, the right lower column 226 and the second right oblique beam 2223, the right wedge block 227 and the first right oblique beam 2213, and the right upper column 228 and the first right oblique beam 2213 are all matched by adopting an inclined surface, so that the bending strength of the whole reaction frame 2 is improved.

In this embodiment, first crossbeam 2211, first left sloping 2212 and first right sloping 2213, the three structure is similar, all includes two square steel pipes (not shown in the figure) that are spliced by the steel sheet and locates a plurality of reinforcing steel plates (not shown in the figure) in the square steel pipe, simple structure, processing is convenient. The second cross beam 2221, the second left oblique beam 2222, and the second right oblique beam 2223 are similar in structure, and each of the second cross beam 2221, the second left oblique beam 2222, and the second right oblique beam 2223 includes two fifth H-shaped steels (not shown in the figure) spliced side by side and a reinforcing plate (not shown in the figure) arranged in the fifth H-shaped steels, and is simple in structure and high in strength.

Further, the left lower column 223, the left upper column 225, the right lower column 226 and the right upper column 228 are formed by welding a plurality of H-shaped steels (not shown) with different lengths side by side. The bottom of the left lower upright 223 is connected to the first connection hole 1121 of the first fixing plate 112 through a left lower upright flange 2231 (see fig. 4), and the bottom of the right lower upright 226 is connected to the second connection hole of the second fixing plate through a right lower upright flange 2261 (see fig. 4). As the entire reaction frame 2 moves forward, the left lower upright 223 is engaged with the first coupling hole 1121 at the corresponding position, and the right lower upright 226 is engaged with the second coupling hole at the corresponding position.

Referring to fig. 3, a plurality of fifth connection holes 2116 are formed in the left column 211 at intervals along the length direction thereof, so that the position of each component in the sub-frame 22 mounted thereon can be adjusted. Similarly, the right upright 212 is provided with a plurality of sixth connecting holes 2126 at intervals along the length direction thereof, so that the position of each component in the sub-frame 22 mounted thereon can be adjusted. The left upright post 211 is connected with all the parts arranged on the left upright post through bolts, and the right upright post 212 is also connected with all the parts arranged on the right upright post through bolts, so that the assembly and disassembly are convenient.

When the shield tunneling machine 100 reaches the installation position of the first ring reinforced concrete ring, the lower cross beam 214 and the second splay structure 222 need to be moved downwards so that the lower cross beam 214 and the second splay structure 222 do not interfere with the guide rail laying and the segment transportation. Specifically, the mounting positions of the lower cross beam 214 on the second flange 2115 and the fourth flange 2125 are moved down, the mounting positions of the second splayed structure 222 on the left upright 211 and the right upright 212 are moved down, and meanwhile, the left lower upright 223, the right lower upright 226, the left wedge block 224 and the right wedge block 227 with corresponding sizes are replaced according to new mounting positions and mounting spaces.

One end of the cross brace 3 is connected with one side of the main frame 21, which is back to the auxiliary frame 22, and the other end is propped against the structural wall. The cross arm 3 and the main frame 21 can be hinged or rigidly connected according to the thrust. In this embodiment, the wale 3 is rigidly connected to the main frame 21, and the wale 3 and the main frame are connected by bolts, so that the wale 3 with different sizes can be conveniently disassembled and replaced. In addition, compared with the traditional reaction frame structure, the embodiment only adopts the cross brace 3 and does not use the inclined brace, so that the upward component force applied to the reaction frame 2 is reduced. Of course, the diagonal brace may be added according to the construction situation, and is not limited herein. The side of the subframe 22 facing away from the wale 3 is configured to be connected to a push rod of a main push cylinder of the shield tunneling machine 100 through the above-described steel ring structure.

In the reaction frame assembly 200 of the present embodiment, the ground beam structure 1, the left column flange 2113 and the right column flange 2123 are used for balancing the vertical component force applied by the shield tunneling machine 100 in propulsion, and the horizontal component force is borne by the structural wall, the cross brace 3 and the reaction frame 2 of the double-layer structure. The reaction frame 2 comprises a two-layer structure of a main frame 21 and an auxiliary frame 22, and has high overall strength and good bending resistance. The sub-frame 22 is removable and the reaction frame 2 can now be used as a normal reaction frame. The position of the reaction frame 2 on the ground beam structure 1 can be adjusted, and the special shield starting process requirements can be met. The subframe 22 adopts the first splayed structure 221 and the second splayed structure 222, and further fixes the first splayed structure 221 and the second splayed structure 222 through the left lower upright column 223, the left upper upright column 225, the left wedge-shaped block 224, the right lower upright column 226, the right upper upright column 228 and the right wedge-shaped block 227, so as to provide the strength and rigidity of the whole structure.

Further, compared with the existing reaction frame which is generally installed in the starting shaft after being assembled on the ground, the reaction frame assembly 200 of the embodiment adopts a split structure, and all the components are detachably connected, so that the starting space is small, and the reaction frame assembly and the shield tunneling machine 100 are installed in a cross mode, so that the interference of installation of cables, pipelines or other structures is avoided. During specific assembly, installation of a cutter head, a front shield, a middle shield, a lower shield tail, an assembling machine and a spiral conveyor in the shield machine 100 can be completed firstly, then a left upright post 211 is installed on a first ground beam 11, a right upright post 212 is installed on a second ground beam 12, then a lower cross beam 214 and a second splayed structure 222 are installed, then an upper cross beam 213 and a first splayed structure 221 are installed after a working platform and an upper shield tail of the shield machine 100 are completed, and finally installation of the cross brace 3 is completed while cables and pipelines of the shield machine 100 are connected.

Referring to fig. 5-7, for the first steel ring 5 and the second steel ring 6, the outer diameters of the first connecting ring 52, the second connecting ring 53, the third connecting ring 62 and the fourth connecting ring 63 are equal and are the same as the outer diameters of the reinforced concrete rings for subsequent construction, that is, the maximum outer diameter of the first steel ring 5 is equal to the maximum outer diameter of the second steel ring 6 and is the same as the outer diameter of the reinforced concrete rings, so that the push rod of the main push cylinder can stably push the first steel ring 5 and the second steel ring 6, and the axis of the steel ring is ensured to be consistent with the designed axis of the reinforced concrete segment and the tunnel for subsequent construction, thereby playing a role of a general negative ring. In addition, in the present embodiment, the inner diameters of the first steel ring body 51 and the second steel ring body 61 (i.e., the inner diameters of the first steel ring 5 and the second steel ring 6) are also the same as the inner diameter of the reinforced concrete segment for subsequent construction, and the outer diameters of the first steel ring body 51 and the second steel ring body 61 are between the inner diameter and the outer diameter of the reinforced concrete segment.

It should be noted that, in order to ensure the sealing effect of the tail of the shield tunneling machine 100, a sealing brush 110 (see fig. 13) is arranged at the shield tail, and the inner diameter of the sealing brush 110 is smaller than the maximum outer diameter of the segment (the first steel ring 5, the second steel ring 6 or the reinforced concrete ring). Generally, the sealing brushes 110 have three ways, and the cavity formed between the sealing brushes 110 is filled with sealing grease, which together with the sealing brushes 110 achieves the effect of preventing water, mud and synchronous grouting material from entering the shield shell from the outside of the shield shell. After the sealing brush 110 is installed, the sealing brush 110 is inclined towards the tail, and the sealing brush 110 is not easy to damage in the forward tunneling process of the shield tunneling machine 100. However, if the shield tunneling machine 100 is not moved forward and the first steel ring 5 and the second steel ring 6 are moved forward, the steel plates and the steel wires of the sealing brushes 110 may be damaged, and the damaged sealing brushes 110 may not achieve the effect of sealing the ground water, the slurry and the synchronous grouting material, which is dangerous for the shield tunneling construction.

In order to solve the above problems, the first connecting ring 52 is detachably connected with the first steel ring body 51, the third connecting ring 62 is detachably connected with the second steel ring body 61, and the first connecting ring 52 and the third connecting ring 62 on the first steel ring 5 and the second steel ring 6 are respectively removed before the first steel ring 5 and the second steel ring 6 move forwards, so that when the first steel ring 5 and the second steel ring 6 move forwards, the first steel ring body 51 and the second steel ring body 61 with smaller outer diameters cannot interfere with the sealing brush 110 on the shield tail, and the sealing brush 110 cannot be damaged, thereby meeting the above special originating process requirements. Meanwhile, the first steel ring 5 and the second steel ring 6 form a large steel ring, and the second connecting ring 53 and the fourth connecting ring 63 at the two ends of the large steel ring can ensure that the axis of the large steel ring is consistent with the designed axis of the tunnel.

For the second connecting ring 53, besides the above functions, the main purpose is to balance the first connecting ring 52 at the other end of the first steel ring body 51, so that the structures at the two ends of the first steel ring 5 are symmetrical, the precision of the first steel ring 5 in assembling is ensured, and the axis of the first steel ring 5 is ensured to be consistent with the design axis of the tunnel. The function of the fourth connection ring 63 in the second steel ring 6 is the same as that of the second connection ring 53, and thus, the description thereof is omitted.

In this embodiment, compared with the reinforced concrete ring of the existing cylindrical structure, the first steel ring 5 and the second steel ring 6 are of a structure with connecting rings at two ends, and under the condition that the axis of the assembled steel ring is coincident with the designed axis of the tunnel and can be matched with the push rod of the main push cylinder, the first connecting ring 52 and the third connecting ring 62 can be removed (see fig. 7) to prevent the first steel ring 5 and the second steel ring 6 from interfering with the sealing brush 110 when moving forward. The special first steel ring 5 and the special second steel ring 6 are used as force transmission media between the shield tunneling machine 100 and the reaction frame 2 to replace a negative ring structure in the traditional process, and after the shield tunneling machine 100 moves forwards, a main thrust cylinder and a hoisting device of the shield tunneling machine 100 drive the first steel ring 5, the second steel ring 6 and the reaction frame 2 to move forwards, so that a vertical material conveying channel is reserved behind the reaction frame assembly 200.

Further, in order to facilitate the assembling of the first steel ring 5 and the second steel ring 6 in the shield tunneling machine 100, the block form of the first steel ring 5 and the second steel ring 6 refers to the block form of the existing common reinforced concrete ring, so that the first steel ring 5 and the second steel ring can be assembled by using an assembling machine in the shield tunneling machine 100. Specifically, referring again to fig. 5, the first steel ring 5 includes three first a-type tube sheets 7, one first B1-type tube sheet 8, one first B2-type tube sheet 9, and one first C-type tube sheet 10; similarly, the second steel ring 6 comprises three second a-type segments 7 ', one second B1-type segment 8', one second B2-type segment 9 'and one second C-type segment 10'; the block form of the two steel rings is the same as that of the existing reinforced concrete segment, and the assembly is convenient according to the existing segment assembly mode. Wherein, first C type section of jurisdiction 10 and second C type section of jurisdiction 10' are the wedge structure to satisfy the structural strength requirement of assembling whole steel ring after the shaping.

During shield construction, the stroke of a push rod of the main push oil cylinder is generally 2.1m, and the width of the first steel ring 5 and the second steel ring 6 is preferably 1.5m, so that the arrangement is mainly as follows: when the shield tunneling machine 100 moves forward by one push rod stroke, the connecting portion of the first steel ring 5 and the second steel ring 6 can expose the shield tail, so that the first connecting ring 52 and the third connecting ring 62 on the first steel ring 5 and the second steel ring 6 are removed before the first steel ring and the second steel ring are moved forward. Of course, the widths of the first steel ring 5 and the second steel ring 6 may be set to 1m, 1.2m or other widths according to specific construction conditions.

Unlike the existing reinforced concrete segment, in the present embodiment, referring to fig. 8 and 9, wherein,

the first A-type pipe sheet 7 comprises a first A-type pipe sheet body 71, a first fixed end plate 72 and a first detachable end plate 73 which are respectively arranged at two arc-shaped ends of the first A-type pipe sheet body 71;

the first B1 type tube sheet 8 comprises a first B1 type tube sheet body, a second fixed end plate and a second detachable end plate which are respectively arranged at two arc-shaped ends of the first B1 type tube sheet body;

the first B2 type pipe 9 comprises a first B2 type pipe body, a third fixed end plate and a third detachable end plate which are respectively arranged at two arc-shaped ends of the first B2 type pipe body;

the first C-shaped pipe 10 includes a first C-shaped pipe body, and a fourth fixed end plate and a fourth detachable end plate respectively disposed at two arc ends of the first C-shaped pipe body.

The three first A-shaped pipe sheets 7, the first B1-shaped pipe sheet 8, the first B2 pipe sheet 9 and the first C-shaped pipe sheet 10 are spliced to form the first steel ring 5. Wherein the three first a-type tube piece bodies 71, the first B1-type tube piece body, the first B2 tube piece body and the first C-type tube piece body just form the first steel ring body 51; the first fixed end plate 72, the second fixed end plate, the third fixed end plate and the fourth fixed end plate just form the second connecting ring 53; while the first removable end plate 73, the second removable end plate, the third removable end plate and the fourth removable end plate just form the first coupling ring 52 described above.

Similarly, the second a-type pipe 7' includes a second a-type pipe body, and a fifth fixed end plate and a fifth detachable end plate are respectively arranged at two arc ends of the second a-type pipe body;

the second B1 type tube sheet 8' comprises a second B1 type tube sheet body and a sixth fixed end plate and a sixth detachable end plate which are respectively arranged at two arc-shaped ends of the second B1 type tube sheet body;

the second B2 type tube 9' comprises a second B2 type tube body and a seventh fixed end plate and a seventh detachable end plate which are respectively arranged at two arc-shaped ends of the second B2 type tube body;

the second C-shaped duct piece 10' comprises a second C-shaped duct piece body and an eighth fixed end plate and an eighth detachable end plate which are respectively arranged at two arc ends of the second C-shaped duct piece body.

And the three second A-shaped tube sheets 7 ', the second B1-shaped tube sheets 8', the second B2-shaped tube sheets 9 'and the second C-shaped tube sheets 10' are spliced to form a second steel ring 6. Wherein the three second a-type tube sheet bodies, the second B1-type tube sheet body, the second B2-type tube sheet body and the second C-type tube sheet body just form the second steel ring body 61; the fifth, sixth, seventh and eighth fixed end plates form a fourth connecting ring 63; while the fifth removable end plate, the sixth removable end plate, the seventh removable end plate, and the eighth removable end plate form a third attachment ring 62.

Preferably, the first fixed end plate 72 is welded with the first a-type tube sheet body 71 as a whole, the second fixed end plate is welded with the first B1-type tube sheet body as a whole, the third fixed end plate is welded with the first B2-type tube sheet body as a whole, the fourth fixed end plate is welded with the first C-type tube sheet body as a whole, the fifth fixed end plate is welded with the second a-type tube sheet body as a whole, the sixth fixed end plate is welded with the second B1-type tube sheet body as a whole, the seventh fixed end plate is welded with the second B2-type tube sheet body as a whole, and the eighth fixed end plate is welded with the second C-type tube sheet body as a whole, so that the structural strength is high.

First detachable end plate 73 is connected with first A type pipe sheet body 71 through bolts, second detachable end plate is connected with first B1 type pipe sheet body through bolts, third detachable end plate is connected with first B2 type pipe sheet body through bolts, fourth detachable end plate is connected with first C type pipe sheet body through bolts, fifth detachable end plate is connected with second A type pipe sheet body through bolts, sixth detachable end plate is connected with second B1 type pipe sheet body through bolts, seventh detachable end plate is connected with second B2 type pipe sheet body through bolts, eighth detachable end plate is connected with second C type pipe sheet body through bolts, and disassembly and assembly are convenient.

Further, referring to fig. 5 to 9 again, seventh connection holes 20 are formed in two arc ends of the first a-type pipe body 71, the first B1-type pipe body, the first B2-type pipe body, the first C-type pipe body, the second a-type pipe body, the second B1-type pipe body, the second B2-type pipe body and the second C-type pipe body, and are used for realizing fixed connection between the first steel ring 5 and the second steel ring 6 and connection between the second steel ring 6 and reinforced concrete for subsequent construction.

Eighth connecting holes 30 are formed in two non-arc ends of the first A-shaped pipe piece body 71, the first B1-shaped pipe piece body, the first B2-shaped pipe piece body and the first C-shaped pipe piece body and used for achieving fixed connection among the pipe pieces in the first steel ring 5. Eighth connecting holes 30 are also formed in two non-arc ends of the second A-shaped pipe piece body, the second B1-shaped pipe piece body, the second B2-shaped pipe piece body and the second C-shaped pipe piece body and used for achieving fixed connection among the pipe pieces in the second steel ring 6, and the steel ring is simple in structure and convenient to assemble. The preferred bolted connection that adopts between the section of jurisdiction and between the steel ring, convenient assembling.

It should be noted that, the connection structures are all disposed on the segment body, and after the first connection ring 52 and the third connection ring 62 are removed, the first steel ring 5 and the second steel ring 6 are still integrated. The setting positions of the eighth connecting holes 30 on the arc ends of the first A-shaped pipe piece body 71, the first B1-shaped pipe piece body, the first B2-shaped pipe piece body, the first C-shaped pipe piece body, the second A-shaped pipe piece body, the second B1-shaped pipe piece body, the second B2-shaped pipe piece body and the second C-shaped pipe piece body correspond to the setting positions of the inter-ring connecting holes in the reinforced concrete pipe piece for construction, and the requirement of assembling and fixing between the second steel ring 6 and the first ring reinforced concrete ring 300 in the follow-up process is met.

Furthermore, hoisting holes 40 are formed in the non-end parts of the first A-type pipe sheet body 71, the first B1-type pipe sheet body, the first B2-type pipe sheet body, the first C-type pipe sheet body, the second A-type pipe sheet body, the second B1-type pipe sheet body, the second B2-type pipe sheet body and the second C-type pipe sheet body, so that the assembling requirement of the assembling machine is met.

In this embodiment, the first a-type pipe piece body 71, the first B1-type pipe piece body, the first B2-type pipe piece body, the first C-type pipe piece body, the second a-type pipe piece body, the second B1-type pipe piece body, the second B2-type pipe piece body and the second C-type pipe piece body are all made of Q235 steel plates with a thickness of 20mm, and the fixed end plate and the detachable end plate are made of Q235 steel plates with a thickness of 30mm, so that the first steel ring 5 and the second steel ring 6 have sufficient structural strength. Of course, the first steel ring 5 and the second steel ring 6 may be made of other types of steel plates according to different construction situations, and are not limited herein. In addition, in the embodiment, the two-ring special steel ring is used for replacing a plurality of reinforced concrete negative rings in the traditional process, so that the dismantling cost when the subsequent starting is finished is also saved.

In this embodiment, the first steel ring 5 and the second steel ring 6 are structures with connecting rings at two ends, the outer diameters of the first connecting ring 52, the second connecting ring 53, the third connecting ring 62 and the fourth connecting ring 63 are equal to each other and are the same as the outer diameter of a reinforced concrete ring for subsequent construction, that is, the maximum outer diameter of the first steel ring 5 and the maximum outer diameter of the second steel ring 6 are equal to each other and are the same as the outer diameter of the reinforced concrete ring, so that the axis of the assembled steel ring is coincident with the design axis of the tunnel and can be matched with a push rod of a main push cylinder, and a negative ring effect in the conventional originating process is achieved. Further, the first connecting ring 52 is detachably connected with the first steel ring body 51, the third connecting ring 62 is detachably connected with the second steel ring body 61, and the first connecting ring 52 and the third connecting ring 62 on the first steel ring 5 and the second steel ring 6 are respectively detached before the first steel ring 5 and the second steel ring 6 move forwards, so that when the first steel ring 5 and the second steel ring 6 move forwards, the first steel ring body 51 and the second steel ring body 61 with smaller outer diameters cannot interfere with the sealing brush 110 on the shield tail, the sealing brush 110 is not damaged, and the special starting process requirements are met.

Referring to fig. 10 to fig. 27, the present embodiment further provides a process for initiating a non-negative ring of a shield machine, which adopts the above-mentioned structure for initiating a non-negative ring of a shield machine, and specifically includes the following steps:

originating portal floor reinforcement

The reinforcing time is preferably selected to be completed one month before the shield machine is assembled in the well, and the reinforcing process is the same as that of the conventional method. Before the shield machine completely enters the tunnel, effective soil pressure is difficult to establish in the soil pressure bin, so the reinforcing effect of the soil body at the tunnel opening is directly related to the success or failure of the shield starting. It should be noted that, when the subsequent shield is initiated, in the reinforcing area, the earth pressure in front of the shield machine is smaller than the friction force between the shield machine and the earth body and between the shield machine and the machine base, and the shield machine does not move back, so that the shield machine stopping mechanism does not need to be installed.

Installation starting machine base and ground beam structure

Before shield starting, the shield machine is required to be accurately placed on a starting machine seat which accords with the design axis, and after all preparation work is ready, the shield machine is tunneled into the stratum along the design axis. Therefore, whether the positioning of the shield starting machine seat before the shield starting is accurate directly influences the starting attitude of the shield machine, and further influences the stress states of the reaction frame and the steel ring. The setting basis of the shield starting engine base comprises the position of the center of the tunnel portal, the design gradient and the horizontal axis. After the initial machine base is installed, the shield machine can enter the hole in the best posture for ensuring the shield machine function. The plane position and elevation of the guide rail at the top of the base are rechecked to ensure that the axis position of the shield machine meets the requirement of the design axis of the tunnel. The structure and installation of the initiator base of this embodiment are the same as those of the existing initiator base, and are not described herein again.

The installation of the ground beam structure in the reaction frame assembly 200 is completed after the installation of the starter block and before the shield machine is assembled downhole. The longitudinal gradient of the ground beam structure is controlled by the gradient of the shield tunnel. The first ground beam and the second ground beam respectively comprise four H-shaped steels and a fixing plate. Four H shaped steel are side by side and with pre-buried structural component welding, further add first gusset and fix. The fixed plate is welded above the four H-shaped steels and is fixed by the second rib plate.

In this embodiment the length of the originating shaft is 12m and the front end of the originating block is 500mm from the structural wall. The front end of the second ground beam of the first ground beam is 2500mm away from the structural wall, the inner side of the second ground beam is 19mm away from the outer side of the starting engine base, and the second ground beam is parallel to the starting engine base along the axial direction of the tunnel.

Assembly and installation of the counterforce frame assembly 200 of the shield machine 100 in the well

Fig. 11 shows a state in which the shield tunneling machine 100 and the reaction frame assembly 200 are assembled. Since the problem of line interference is involved in the installation, the shield machine 100 is assembled to intersect with the reaction frame assembly 200. The reaction frame assembly 200 provided by the embodiment is of a split detachable structure, and meets the requirement of split assembly.

First, the installation of the cutter head, the front shield, the middle shield, the lower shield tail, the assembling machine, and the screw conveyor in the shield machine 100 is completed. And then, mounting the left upright post on the first ground beam, mounting the right upright post on the second ground beam, and mounting the lower cross beam and the second splayed structure. And then, after the shield machine working platform and the upper shield tail are completed, the upper beam and the first splayed structure are installed. And finally, connecting the shield tunneling machine cable and the pipeline and simultaneously completing the installation of the cross brace. The final parking position after the reaction frame 2 is installed is as follows: the foremost side of the reaction frame 2 is 1800mm from the structural wall.

The left stand is connected with the first ground beam through a left stand flange, and the right stand is connected with the second ground beam through a right stand flange. The rear support is completely a cross support, and an inclined support is cancelled, so that the upward component force applied to the reaction frame 2 is reduced. The left upright post and the first ground beam and the right upright post and the second ground beam are vertical to each other as much as possible, the included angles between the left upright post and the shield tunneling machine 100 axis are controlled to be 85-90 degrees, and beyond the range, the left upright post flange, the right upright post flange and the connecting bolt are damaged. The installation sequence of the cross braces is from bottom to top, the angle between the axis of the cross brace and the left upright post or the right upright post is controlled to be 89-90 degrees during installation, and the oblique stress is reduced. The installation positions of the left and right cross braces use a vertical plane where the reaction frame assembly 200 is located along the direction of the tunnel axis as a symmetrical reference plane, so that the reaction frame assembly 200 is free of torque stress in the propelling process of the shield machine 100.

The upper cross beam, the lower cross beam, the first splayed structure and the second splayed structure meet the strength design requirement, the clearance between the upper cross beam and the lower cross beam also meets the passing requirement of a rear matched trolley, the lower cross beam does not interfere with the base when the reaction frame assembly 200 moves, and the lower cross beam does not interfere with a segment of a secondary lifting mechanism.

Installation of waterproof curtain cloth for chiseling initial opening pile and opening door

The method for chiseling the initial opening door pile is the same as the traditional construction process. The fender pile is reinforced concrete pile, and the fender pile in the portal scope needs all to chisel out, and the fender pile is the glass fiber pile, only needs to chisel out synchronous slip casting spine and fishtail sword department pile body. When the reinforced concrete fender pile is chiseled, in order to ensure the stability of the soil body at the opening, the chiseling at the opening is carried out for three times, the long-time exposure of the soil body is avoided, the chiseling of the filling pile at the opening is carried out within 7 days before starting, and manual operation is adopted.

The installation of the waterproof curtain cloth of the tunnel door is the same as the traditional construction process. Before construction, the integrity of the material, particularly whether the rubber cord fabric is intact, whether the radial nylon lines are densely arranged and whether bolt holes are intact are checked. Before installation, the dregs at the opening of the cave are cleaned and the steel ring preformed hole at the opening of the cave is dredged. And screwing the bolt into a nut embedded in the steel ring of the tunnel door in advance. Installing the rubber cord fabric and the pressing plate, sleeving the fan-shaped pressing plate on the bolt, and pressing the fan-shaped pressing plate tightly by using the nut.

The first steel ring 5 and the second steel ring 6 are assembled

Before the shield machine 100 is assembled in a well, the first steel ring 5 and the second steel ring 6 are firstly stored in an originating well or a passage behind the originating well, and after the shield machine 100 and the reaction frame 2 are assembled and debugged, the assembly machine of the shield machine 100 is used for assembling the first steel ring 5 and the second steel ring 6.

The first steel ring 5 and the second steel ring 6 are installed in the shield tunneling machine 100 ring by ring. First, the assembling machine assembles the first steel ring 5 (see fig. 12), the main push cylinder pushes the first steel ring 5 backwards until the first steel ring 5 abuts against the counterforce frame assembly 200 (see fig. 13), and the first steel ring 5 and the subframe of the counterforce frame assembly 200 are welded and fixed. In this embodiment, the first steel ring 5 moves backwards by 1.37m and then pushes up the reaction frame assembly 200, but the main push cylinder and the assembling machine have relative position requirements, and the first steel ring 5 and the reaction frame assembly 200 must move backwards by 0.13m to leave enough space for assembling the second steel ring 6, that is, the first steel ring 5 needs to be pushed backwards by 1.5m in total. When moving backward, the connection between the reaction frame assembly 200 and the ground beam structure 1 is removed, and after moving backward to 0.13m, the reaction frame assembly 200 and the ground beam structure 1 are fixed again. Thereafter, the second steel ring 6 (see fig. 14) is assembled and fixed with the first steel ring 5.

The assembling sequence of the pipe pieces in the first steel ring 5 and the assembling sequence of the pipe pieces in the second steel ring 6 are the same as the assembling sequence of the general reinforced concrete pipe pieces, and the description is omitted here. The pipe pieces in the first steel ring 5, the pipe pieces in the second steel ring 6 and the first steel ring 5 and the second steel ring 6 are connected through bolts.

Shield tunneling machine 100 is first propelled forward

Referring to fig. 15, the push rod extends backward, and the shield tunneling machine 100 moves forward for the first time by using the reverse thrust of the first steel ring 5, the second steel ring 6 and the reaction frame assembly 200. The amount of advancement is preferably 1.6m, so that the connection of the first steel ring 5 and the second steel ring 6 exposes the shield tail.

Removing the first connecting ring 52 on the first steel ring 5 and the third connecting ring 62 on the second steel ring 6

Referring to fig. 16, the connection bolts between the first connection ring 52 and the first steel ring body 51 and between the second connection ring 53 and the second steel ring body 61 are unscrewed.

Removing the connection of the counterforce frame component 200 and the ground beam structure 1

The connecting bolts between the left upright column flange and the first ground beam 11, the connecting bolts between the left lower upright column flange and the first ground beam 11, the connecting bolts between the right upright column flange and the second ground beam and the connecting bolts between the right lower upright column flange and the second ground beam are removed, so that the main frame and the subframe are removed from the ground beam structure 1 together.

Forwards moving first steel ring 5, second steel ring 6 and reaction frame 2

The supporting shoes and the second steel ring 6 are temporarily fixed by tools such as steel wires or steel ropes, the reaction frame 2 and the cross beam are lifted by a lifting device such as a gantry crane of a well head of an originating vertical shaft (the reaction frame 2 leaves the ground beam structure 1), the main push oil cylinder retracts, and the push rod pulls the second steel ring 6, the first steel ring 5, the reaction frame 2 and the cross beam 3 to move forwards. When the shield is moved forwards, the uniform stress of each structure is ensured, the forward movement speed is controlled, the second steel ring 6, the first steel ring 5 and the reaction frame 2 are carefully observed, the movement is immediately stopped when the abnormality (welding line cracking, shield tail clearance abnormality, segment bolt looseness and the like) is found, the abnormality is treated, and the structure cannot be moved forwards before the abnormality is treated. In the present embodiment, the advancing distance is 1.5m (see fig. 17). In addition, instead of lifting the reaction frame 2, grease may be applied to the first and second floor beams 11 and the left and right columns 211 and 212 to reduce the thrust resistance.

Fixing a reaction frame 2 to a ground beam structure 1

And fixing the reaction frame 2 after being moved forward to the ground beam structure 1 at a corresponding position. The fixing mode is the same as the initial installation mode, and the description is omitted here. The wale 3 is replaced or lengthened, so that the wale 3 can be abutted against the structural wall again. Before construction, several cross braces 3 with different lengths can be pre-processed, so that the cross braces are convenient to replace.

Secondary forward movement of shield tunneling machine 100

The push rod extends backwards again, and the shield tunneling machine 100 moves forwards under the action of the reaction thrust of the first steel ring 5, the second steel ring 6 and the reaction frame assembly 200, wherein the forward movement amount is preferably 1.5m (see fig. 18).

The connection between the reaction frame 2 and the ground beam structure 1 is removed again

The removal process is the same as described above and will not be described further herein.

The first steel ring 5, the second steel ring 6 and the reaction frame 2 are moved forwards again

The advancing process was the same as described above, and the advancing amount was 1.5m (see FIG. 19).

The reaction frame 2 is again fixed to the ground beam structure 1

The fixing manner is the same as described above. The cross brace 3 is replaced or lengthened, so that the cross brace 3 can be abutted against the structural wall. Before construction, several cross braces 3 with different lengths can be pre-processed, so that the cross braces are convenient to replace. To this end, the shield tunneling machine 100, the first steel ring 5, the second steel ring 6, and the reaction frame 2 complete two forward movements.

And repeating the process of secondary forward movement of the shield tunneling machine 100 and the process of secondary forward movement of the first steel ring 5, the second steel ring 6 and the reaction frame 2 until the distance from the second steel ring 6 to the starting tunnel portal reaches the installation allowance of the tunnel portal ring beam. The ring beam of the opening acts as a first ring of reinforced concrete 300 to be installed, which typically extends 600mm beyond the originating opening to ensure a seal with the opening. In this embodiment, after the second forward movement, the shield tunneling machine 100, the first steel ring 5, the second steel ring 6, and the reaction frame 2 are further moved forward a third forward movement (see fig. 20 to 21) and a fourth forward movement (see fig. 22 to 23), respectively, and each forward movement amount is 1.5 m. At this time, the distance between the second steel ring 6 and the initial opening is 1196mm (see fig. 23), and then the shield tunneling machine 100, the first steel ring 5, the second steel ring 6 and the reaction frame 2 are respectively moved forward for the fifth time by 596mm (see fig. 24-25), so that the distance between the second steel ring 6 and the initial opening is exactly 600mm, and the shield tunneling machine reaches the installation position of the opening ring beam (i.e. the first ring reinforced concrete ring 300).

The mounting positions of the lower cross beam and the second splayed structure on the main frame are moved downwards

Before installing the opening ring beam, the lower cross beam and the second splayed structure on the reaction frame assembly 200 need to be moved downwards so as not to interfere with the lifted pipe piece. Specifically, the mounting positions of the lower cross beam on the second flange and the fourth flange are moved downwards, the mounting positions of the second splayed structure on the left upright post and the right upright post are moved downwards, and the left lower upright post, the right lower upright post, the left wedge block and the right wedge block with corresponding sizes are replaced according to new mounting positions and mounting spaces.

Process for installing first ring reinforced concrete ring 300 and starting shield in split mode

After the lower beam and the second splay structure move down, the shield tunneling machine 100 moves forward by 1.2m to reserve the amount of the first ring of reinforced concrete ring 300 to be installed (see fig. 26). The segments are then transported and the first ring of reinforced concrete 300 (see figure 27) is spliced and secured to the second steel ring 6. The first steel ring 5, the second steel ring 6 and the reaction frame 2 stay to the portal opening of the tunnel without moving forwards, and the process enters a general shield split starting process. After the shield tunneling machine 100 tunnels about 100m, the starting process is finished, and the first steel ring 5, the second steel ring 6 and the reaction frame assembly 200 can be removed.

It should be noted that, the thickness of the structural wall of a general subway station is 0.9m, the pile diameter of the fender pile is 1m, the distance between the face of a cutter and the structural wall is 0.5m after the shield machine 100 is assembled, the distance between the face of the cutter and the rear part of the soil pressure cabin is 1.5m, an originating tunnel portal is reserved at the shield originating position of the structural wall, and the reinforced concrete fender pile needs to be chiseled off before the shield is initiated, so that the shield machine 100 does not need to be excavated when being pushed forward for 3.9 m.

In addition, there is a certain requirement on the first forward movement amount of the shield tunneling machine 100, so as to ensure that the shield tail is exposed at the joint of the first steel ring 5 and the second steel ring 6, so as to remove the subsequent first connecting ring 52 and the third connecting ring 62, and prevent the shield tail sealing brush 110 from being damaged when the first steel ring 5 and the second steel ring 6 move forward. The amount of the secondary forward movement and each subsequent forward movement of the shield machine 100 and the total forward movement times of the shield machine 100 are not particularly limited, and can be adjusted according to the length of the originating tunnel, the distance from the second steel ring 6 to the originating tunnel, and the push rod stroke.

The shield non-negative ring starting structure and the starting process provided by the embodiment aim at reserving a vertical material transportation channel in a starting well, the matched equipment and the starting process are redesigned, a traditional fixed reaction frame is changed into a movable reaction frame assembly 200, a main thrust cylinder and a hoisting device of a shield machine 100 are utilized to drive a first steel ring 5, a second steel ring 6 and a reaction frame 2 to move forwards, and after the reaction frame 2 moves forwards, the space between the reaction frame 2 and a starting well structure wall can meet the vertical material transportation requirement. The first steel ring 5 and the second steel ring 6 adopt special split type detachable structures, not only play the role of a common negative ring, but also can be detached from the first connecting ring 52 and the third connecting ring 62 before moving forwards, so that the shield tail sealing brush 110 is not damaged, and the special starting process of the embodiment is met.

Claims (10)

1. The utility model provides a shield constructs no burden ring originating structure which characterized in that includes:

the counterforce frame assembly (200) comprises a ground beam structure (1), a counterforce frame (2) and a plurality of cross braces (3), wherein the ground beam structure (1) is arranged in the starting shaft, the counterforce frame (2) is arranged on the ground beam structure (1) in a position-adjustable manner, one ends of the cross braces (3) are detachably connected with the counterforce frame (2), and the other ends of the cross braces are configured to abut against a structural wall;

the first steel ring (5) comprises a first steel ring body (51), a first connecting ring (52) and a second connecting ring (53), wherein the first connecting ring (52) is detachably arranged at the circumferential direction of a first end of the first steel ring body (51), and the second connecting ring (53) is arranged at the circumferential direction of a second end of the first steel ring body (51);

the second steel ring (6) comprises a second steel ring body (61), a third connecting ring (62) and a fourth connecting ring (63), the third connecting ring (62) is detachably arranged at the first end circumference of the second steel ring body (61), and the fourth connecting ring (63) is arranged at the second end circumference of the second steel ring body (61);

the first end of the first steel ring (5) is fixedly connected with the first end of the second steel ring (6), the second end of the first steel ring (5) is connected with one side, back to the cross brace (3), of the reaction frame (2), and the second end of the second steel ring (6) is configured to be connected with a push rod of a main push oil cylinder of the shield tunneling machine (100);

the first connecting ring (52), the second connecting ring (53), the third connecting ring (62) and the fourth connecting ring (63) have the same outer diameter, and the outer diameters of the first connecting ring, the second connecting ring, the third connecting ring and the fourth connecting ring are the same as that of the reinforced concrete ring for construction.

2. The shield minus-loop-free originating structure of claim 1,

the first steel ring (5) comprises three first A-shaped pipe pieces (7), a first B1-shaped pipe piece (8), a first B2-shaped pipe piece (9) and a first C-shaped pipe piece (10);

the second steel ring (6) comprises three second A-shaped pipe pieces (7 '), one second B1-shaped pipe piece (8'), one second B2-shaped pipe piece (9 ') and one second C-shaped pipe piece (10').

3. The shield minus-loop-free originating structure of claim 2,

the first A-shaped pipe piece (7) comprises a first A-shaped pipe piece body (71), a first fixed end plate (72) and a first detachable end plate (73), wherein the first fixed end plate and the first detachable end plate are respectively arranged at two arc-shaped ends of the first A-shaped pipe piece body (71);

the first B1 type pipe piece (8) comprises a first B1 type pipe piece body, a second fixed end plate and a second detachable end plate which are respectively arranged at two arc-shaped ends of the first B1 type pipe piece body;

the first B2 type pipe piece (9) comprises a first B2 type pipe piece body, a third fixed end plate and a third detachable end plate which are respectively arranged at two arc-shaped ends of the first B2 type pipe piece body;

the first C-shaped pipe piece (10) comprises a first C-shaped pipe piece body, a fourth fixed end plate and a fourth detachable end plate, wherein the fourth fixed end plate and the fourth detachable end plate are respectively arranged at two arc-shaped ends of the first C-shaped pipe piece body;

the first A-type pipe sheet body (71), the first B1-type pipe sheet body, the first B2-type pipe sheet body and the first C-type pipe sheet body are spliced to form the first steel ring body (51), the first fixed end plate (72), the second fixed end plate, the third fixed end plate and the fourth fixed end plate form the second connecting ring (53), and meanwhile, the first detachable end plate (73), the second detachable end plate, the third detachable end plate and the fourth detachable end plate form the first connecting ring (52).

4. The shield minus-loop-free originating structure of claim 3,

the second A-shaped pipe piece (7') comprises a second A-shaped pipe piece body, a fifth fixed end plate and a fifth detachable end plate, wherein the fifth fixed end plate and the fifth detachable end plate are respectively arranged at two arc-shaped ends of the second A-shaped pipe piece body;

the second B1 type pipe piece (8') comprises a second B1 type pipe piece body, a sixth fixed end plate and a sixth detachable end plate which are respectively arranged at two arc-shaped ends of the second B1 type pipe piece body;

the second B2 type pipe piece (9') comprises a second B2 type pipe piece body, a seventh fixed end plate and a seventh detachable end plate which are respectively arranged at two arc-shaped ends of the second B2 type pipe piece body;

the second C-shaped pipe piece (10') comprises a second C-shaped pipe piece body, and an eighth fixed end plate and an eighth detachable end plate which are respectively arranged at two arc ends of the second C-shaped pipe piece body;

the second A type pipe sheet body, the second B1 type pipe sheet body, the second B2 type pipe sheet body and the second C type pipe sheet body are spliced to form the second steel ring body (61), the fifth fixed end plate, the sixth fixed end plate, the seventh fixed end plate and the eighth fixed end plate form the fourth connecting ring (63), and meanwhile, the fifth detachable end plate, the sixth detachable end plate, the seventh detachable end plate and the eighth detachable end plate form the third connecting ring (62).

5. The shield negative-loop-free originating structure of claim 4, wherein the first fixed end plate (72) is welded to the first A-type tube sheet body (71), the second fixed end plate is welded to the first B1-type tube sheet body, the third fixed end plate is welded to the first B2-type tube sheet body, and the fourth fixed end plate is welded to the first C-type tube sheet body;

the fifth fixed end plate and the second A-shaped pipe sheet body are welded into a whole, the sixth fixed end plate and the second B1-shaped pipe sheet body are welded into a whole, the seventh fixed end plate and the second B2-shaped pipe sheet body are welded into a whole, and the eighth fixed end plate and the second C-shaped pipe sheet body are welded into a whole.

6. The shield minus-loop-free originating structure of claim 4, wherein the first detachable end plate (73) is bolted to the first A-type tube sheet body (71), the second detachable end plate is bolted to the first B1-type tube sheet body, the third detachable end plate is bolted to the first B2-type tube sheet body, and the fourth detachable end plate is bolted to the first C-type tube sheet body;

the fifth detachable end plate is connected with the second A-shaped pipe sheet body through bolts, the sixth detachable end plate is connected with the second B1-shaped pipe sheet body through bolts, the seventh detachable end plate is connected with the second B2-shaped pipe sheet body through bolts, and the eighth detachable end plate is connected with the second C-shaped pipe sheet body through bolts.

7. The shield negative-loop-free starting structure of claim 4, wherein the first A-type pipe sheet body (71), the first B1-type pipe sheet body, the first B2-type pipe sheet body, the first C-type pipe sheet body, the second A-type pipe sheet body, the second B1-type pipe sheet body, the second B2-type pipe sheet body and the second C-type pipe sheet body are provided with seventh connecting holes (20) at two arc ends thereof for realizing fixed connection between the first steel ring (5) and the second steel ring (6).

8. The shield negative-loop-free starting structure of claim 1, wherein the ground beam structure (1) comprises a first ground beam (11) and a second ground beam (12) which are arranged in parallel and at intervals, the reaction frame (2) comprises a main frame (21), the main frame (21) comprises a left upright (211), a right upright (212), an upper cross beam (213) and a lower cross beam (214), the left upright (211) is adjustably fixed on the first ground beam (11), the right upright (212) is adjustably fixed on the second ground beam (12), the upper cross beam (213) and the lower cross beam (214) are both arranged between the left upright (211) and the right upright (212), and the installation position of the lower cross beam (214) on the left upright (211) and the right upright (212) is adjustable.

9. The shield non-negative-loop originating structure of claim 8, wherein the reaction frame (2) further comprises a subframe (22) fixedly attached to one side of the main frame (21), and the subframe (22) comprises a first splayed structure (221) and a second splayed structure (222) which are oppositely arranged;

the first splayed structure (221) comprises a first cross beam (2211), one end of the first cross beam (2211) is provided with a first left oblique beam (2212), the other end of the first cross beam is provided with a first right oblique beam (2213), the first cross beam (2211) is attached to the upper cross beam (213), one end, away from the first cross beam (2211), of the first left oblique beam (2212) is fixed on the left upright post (211), and one end, away from the first cross beam (2211), of the first right oblique beam (2213) is fixed on the right upright post (212);

the second splayed structure (222) comprises a second cross beam (2221), one end of the second cross beam (2221) is provided with a second left oblique beam (2222), the other end of the second cross beam is provided with a second right oblique beam (2223), the second cross beam (2221) is attached to the lower cross beam (214), one end of the second left oblique beam (2222), which is far away from the second cross beam (2221), is adjustably fixed on the left upright post (211), and one end of the second right oblique beam (2223), which is far away from the second cross beam (2221), is adjustably fixed on the right upright post (212).

10. The shield minus-loop-free originating structure according to claim 9, characterized in that said secondary frame (22) further comprises:

the left lower upright post (223) is detachably and fixedly arranged on the left upright post (211) and is positioned below the second left oblique beam (2222), the upper end face of the left lower upright post (223) is attached to the lower end face of the second left oblique beam (2222), and the lower end of the left lower upright post (223) is detachably and fixedly arranged on the first ground beam (11);

the right lower upright post (226) is detachably and fixedly arranged on the right upright post (212) and is positioned below the second right oblique beam (2223), the upper end surface of the right lower upright post (226) is attached to the lower end surface of the second right oblique beam (2223), and the lower end of the right lower upright post (226) is detachably and fixedly arranged on the second ground beam (12);

the left wedge-shaped block (224) is detachably and fixedly arranged on the left upright post (211), the upper end face of the left wedge-shaped block (224) is attached to the lower end face of the first left oblique beam (2212), and the lower end face of the left wedge-shaped block (224) is attached to the upper end face of the second left oblique beam (2222);

the right wedge-shaped block (227) is detachably and fixedly arranged on the right upright post (212), the upper end face of the right wedge-shaped block (227) is attached to the lower end face of the first right oblique beam (2213), and the lower end face of the right wedge-shaped block (227) is attached to the upper end face of the second right oblique beam (2223);

the left upper upright post (225) is detachably and fixedly arranged on the left upright post (211) and is positioned above the first left oblique beam (2212), and the lower end face of the left upper upright post (225) is attached to the upper end face of the first left oblique beam (2212);

the right upper upright post (228) is detachably and fixedly arranged on the right upright post (212) and is positioned above the first right oblique beam (2213), and the lower end face of the right upper upright post (228) is attached to the upper end face of the first right oblique beam (2213).

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