CN117005888A - Transverse and longitudinal high-rigidity shield tunnel structure - Google Patents
Transverse and longitudinal high-rigidity shield tunnel structure Download PDFInfo
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- CN117005888A CN117005888A CN202310944275.XA CN202310944275A CN117005888A CN 117005888 A CN117005888 A CN 117005888A CN 202310944275 A CN202310944275 A CN 202310944275A CN 117005888 A CN117005888 A CN 117005888A
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- 238000005452 bending Methods 0.000 claims abstract description 107
- 230000009471 action Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
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- Lining And Supports For Tunnels (AREA)
Abstract
The transverse and longitudinal high-rigidity shield tunnel structure comprises a plurality of segments which are spliced in sequence in the cross section to form a cylindrical tunnel, a positive bending moment joint and a negative bending moment joint which are connected with the segments, a tenon segment and a tenon segment which are spliced in the longitudinal direction, and a circular seam joint which is connected with the tenon segment and the tenon segment; the cylindrical tunnel comprises a positive bending moment area and a negative bending moment area; the positive bending moment joint is arranged in a positive bending moment area, and the negative bending moment joint is arranged in a negative bending moment area; the positive bending moment joint comprises at least one pair of first embedded parts and at least one first short straight bolt; the first short straight bolts penetrate through the first embedded parts to be locked; the hogging moment joint comprises at least one pair of second embedded parts and at least one second short straight bolt; the second short straight bolts penetrate through the second embedded parts to be locked; the tenon segment is provided with tenons; the tenon segment is provided with a tenon in a protruding way; the circular seam joint comprises a quick connecting piece and two sleeves; the quick connector comprises a body and two screws. The invention can improve the transverse and longitudinal rigidity of the tunnel.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to a transverse and longitudinal high-rigidity shield tunnel structure.
Background
The shield tunnel lining structure is generally formed by assembling a plurality of segments to form an annular lining, multiple ring linings are connected to form the annular lining, longitudinal joint joints connected in the rings and annular joint joints connected between the rings are weak links of the structure, and the rigidity of the longitudinal joint joints and the annular joint joints is lower than that of the segments, so that the rigidity of the cross section ring and the longitudinal rigidity of the structure are mainly controlled by the rigidity of joints, and the rigidity of the joints is mainly controlled by a connecting mode.
The joint connection mode of the longitudinal joint in the cross section is commonly known as bent bolt connection and inclined bolt connection in the current engineering. When the bending bolt is connected, the bolt is usually closer to the intrados of the joint, so that the bolt can act earlier when the joint is positioned in a positive bending moment area, the intrados of the joint is restrained from opening, and the deformation of the joint is reduced, but when the bending moment area is formed, the joint needs to be opened to a certain degree, so that the bolt can act when the bolt is positioned in a tension area, the bending moment joint is deformed more, and the integral rigidity and the waterproof performance of the structure are not facilitated. When the oblique bolts are connected, the bolts are usually obliquely penetrated near the center of the joint, which can promote the deformation of the joint under the action of negative bending moment, but is not beneficial to the performance of the joint in the positive bending moment. At present, the common bolt forms are unfavorable for improving the rigidity of the tunnel structure because the positions of the bolts are the same at any longitudinal joint and the bolts cannot generate the same performance under the working conditions of positive and negative bending moments.
In a longitudinal circular seam joint, common pipe piece circular seam forms are 'oblique bolts and concave-convex tenons', 'bent bolts and flat joints', 'bent bolts and concave-convex tenons', and the like, and circular seam shearing resistance is mainly carried out by a circular seam concrete friction mechanism, an oblique bolt or bent bolt pin mechanism and a concave-convex tenon meshing mechanism. However, the joints in the above forms are provided with bolt-bolt hole gaps, and the bolts can play a role in greatly limiting dislocation after contacting with the bolt holes, so that the longitudinal rigidity of the tunnel is lower, and the uneven settlement of the longitudinal seams of the tunnel is not controlled.
Disclosure of Invention
The invention aims to solve the technical problems that: the tunnel structure provided by the invention can change the positions of bolts in the transverse direction according to the difference of positive and negative bending moments of the joint, so that the bolts can play a role in the working conditions of the positive and negative bending moments, and the transverse rigidity of the tunnel is improved; the longitudinal direction is provided with the distributed rebate mode of the inserted quick connecting piece combination, so that the rigidity of the circular seam is improved, and the longitudinal rigidity is improved.
In order to solve the technical problems, the invention provides the following technical scheme: a transverse and longitudinal high-rigidity shield tunnel structure comprises a plurality of segments which are spliced and fixed in sequence in the cross section to form a cylindrical tunnel, a plurality of positive bending moment joints and a plurality of negative bending moment joints which are connected with the segments, a tenon segment and a tenon segment which are spliced and fixed in the longitudinal direction, and a circular seam joint which is connected with the tenon segment and the tenon segment;
the cylindrical tunnel formed by splicing and fixing the plurality of segments comprises a positive bending moment area and a negative bending moment area;
the positive bending moment joints or the negative bending moment joints are respectively arranged at the splicing positions of every two adjacent segments, the positive bending moment joints are arranged in the positive bending moment area, and the negative bending moment joints are arranged in the negative bending moment area;
the two ends of the duct piece are provided with positive bending moment connectors, and the two ends of the duct piece are provided with first bolt hand holes;
the two ends of the duct piece are provided with hogging moment joints, and the two ends of the duct piece are provided with second bolt hand holes;
the two ends of the pipe piece are respectively provided with a positive bending moment joint and a negative bending moment joint, and a first bolt hand hole and a second bolt hand hole are correspondingly formed at the two ends of the pipe piece;
each positive bending moment joint comprises at least one pair of first embedded parts and at least one first short straight bolt;
the at least one pair of first embedded parts are equally divided into two parts, and then are respectively embedded in two segments connected by the positive bending moment joint, and each first embedded part comprises a first perforated panel and at least one first bolt hole formed in the first perforated panel;
the two duct pieces are spliced together, the first perforated panels of the at least one pair of first embedded parts are stuck together, and the first short straight bolts penetrate through the first bolt holes of the at least one pair of first embedded parts to be locked, so that the two duct pieces can be spliced and fixed;
each hogging moment joint comprises at least one pair of second embedded parts and at least one second short straight bolt;
the at least one pair of second embedded parts are equally divided into two parts, and then are respectively embedded in two duct pieces connected by the hogging moment joint, and each second embedded part comprises a second perforated panel and at least one second bolt hole formed in the second perforated panel;
the two duct pieces are spliced together, the second perforated panels of the at least one pair of second embedded parts are stuck together, and the second short straight bolts penetrate through the second bolt holes of the at least one pair of second embedded parts to be locked, so that the two duct pieces can be spliced and fixed;
the height of the first perforated panel is smaller than that of the second perforated panel, the positions of the first bolt hole and the first short straight bolt are close to the inner cambered surface of the cylindrical tunnel, the positions of the second bolt hole and the second short straight bolt are close to the outer cambered surface of the cylindrical tunnel, and the first bolt hand hole is shallower than the second bolt hand hole;
the end part of the tenon segment, which is close to the circular seam joint, is internally provided with a tenon;
the end part of the tenon segment, which is close to the circular seam joint, is provided with a tenon in a protruding way outwards;
the circular seam joint comprises a linear quick connecting piece and two sleeves which are respectively embedded in the tenons and the tenons;
the quick connector comprises a body and two screws extending out from two ends of the body in a straight line.
The technical scheme is further defined in that each first embedded part further comprises a plurality of first embedded anchor bars, one ends of the first embedded anchor bars are connected to the first perforated panel, and the other ends of the first embedded anchor bars are anchored in the duct piece; each second embedded part further comprises a plurality of second embedded anchor bars, one ends of the second embedded anchor bars are connected to the second perforated panel, and the other ends of the second embedded anchor bars are anchored in the duct piece.
A further limitation of the above technical solution is that the first bolt hole is close to the lower side of the first perforated panel and the second bolt hole is close to the upper side of the second perforated panel.
The technical scheme is further limited in that the first perforated panel is flush with the concrete on the joint surface, and the two duct pieces are closely attached except for the caulking area after being assembled; the second perforated panel is flush with the concrete on the joint surface, the two segments are closely attached to each other except for the caulking area after being assembled, and the height of the second perforated panel is lower than the height of the external cambered surface caulking.
The technical scheme is further limited in that the number of the plurality of duct pieces is nine, the number of the plurality of positive bending moment connectors is five, and the number of the plurality of negative bending moment connectors is four; the cylindrical tunnel formed by splicing nine segments is in the vertical upward direction of the circle center of the cylindrical tunnel at the positive bending moment area in the range of 0-45 degrees, 135-225 degrees and 315-360 degrees, and in the negative bending moment area in the range of 45-135 degrees and 225-315 degrees; a first duct piece is arranged at the center of the top end of the cylindrical tunnel, and second to ninth duct pieces are sequentially arranged from the first duct piece along the circumference clockwise; and each two adjacent segments are respectively provided with a positive bending moment joint or a negative bending moment joint, the five positive bending moment joints are arranged in the positive bending moment area, and the four negative bending moment joints are arranged in the negative bending moment area.
The technical scheme is further defined in that the body and the two screws are positioned on the same straight line.
A further limitation of the above solution is that each screw has a diameter that gradually decreases from the point of connection with the body to the front end furthest from the body.
The technical scheme is further defined in that the front end of each sleeve is provided with a sleeve front wall wrapping the front end of the screw, the middle of each sleeve is provided with a sleeve side wall wrapping the screw, and the rear end of each sleeve is provided with an opening for inserting the screw.
The technical scheme is further limited in that the tenons and the tenons are prefabricated and formed by adopting a duct piece template, and the geometric accuracy of the tenon and mortise structure is guaranteed in the forming process.
The technical scheme is further defined in that one screw of the quick connector is screwed into a tenon connecting hole formed by a sleeve embedded in the tenon, and the other screw of the quick connector is extruded into the tenon connecting hole formed by the sleeve embedded in the tenon under the action of a jack of the shield tunneling machine and is extruded in place; or one screw of the quick connecting piece is screwed into the tenon connecting hole formed by the sleeve embedded in the tenon, and the other screw of the quick connecting piece is extruded into the tenon connecting hole formed by the sleeve embedded in the tenon under the action of the jack of the shield machine and is extruded in place.
Compared with the prior art, the invention has the following beneficial effects: according to the transverse and longitudinal high-rigidity structure provided by the invention, the high rigidity of both positive and negative bending moments is realized by adjusting the positions of the positive and negative bending moment longitudinal joint bolts in the transverse direction, so that the integral rigidity of the cross section of the tunnel structure is improved, the high rigidity is realized in the longitudinal direction by combining the quick connecting pieces in the form of the concave-convex tenons, the quick connecting pieces can exert performance earlier by virtue of no gaps between the quick connecting pieces and the sleeves, and the concave-convex tenons further enhance the circumferential joint performance. Compared with the existing shield tunnel structure form, the shield tunnel structure has higher structural rigidity, and is more suitable for shield projects with high requirements on earth surface subsidence, such as tunnel underpass airport runway, underpass history protection building and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of a tunnel structure according to the present invention with different bolt positions in the lateral direction according to the positive and negative bending moment regions.
FIG. 2 is a schematic illustration of the back and side of a first embedment of a positive bending moment joint.
FIG. 3 is a schematic view of the back and side of a second embedment of a hogging moment joint.
Fig. 4 is a cross-sectional view of a positive bending moment joint and a segment connected on both sides thereof.
Fig. 5 is a cross-sectional view of a hogging moment joint and a segment of a tube connected on both sides thereof.
Fig. 6 is a schematic view of a longitudinal circumferential quick connector assembly distribution type rebate structure according to the present invention.
Fig. 7 is a schematic structural view of a tongue segment, and a circumferential seam joint.
Fig. 8 is a block diagram of the tongue tube piece.
Fig. 9 is a block diagram of a tenon segment.
Fig. 10 is a structural view of the girth joint.
Detailed Description
The transverse and longitudinal high-rigidity shield tunnel structure is a cylindrical tunnel, the transverse direction refers to the cross section of the cylindrical tunnel, and the longitudinal direction refers to the direction parallel to the axis of the cylindrical tunnel.
As shown in fig. 1 to 5, from the transverse view, the transverse and longitudinal high-rigidity shield tunnel structure of the invention comprises nine pipe pieces 1 which are of the same size and are spliced and fixed in sequence on the cross section of the shield tunnel to form a cylindrical tunnel, five positive bending moment joints 2 and four negative bending moment joints 3 which are connected with the nine pipe pieces 1.
The above-mentioned nine tube segments 1 are spliced and fixed to form a cylindrical tunnel, the directions of the vertical upward direction passing through the circle center are defined as 0 degrees and 360 degrees, the cylindrical tunnel is assumed to be in the range of 0 degrees to 45 degrees, 135 degrees to 225 degrees, 315 degrees to 360 degrees to be in the positive bending moment region (the region A1 and the region A2 shown in figure 1), and the ranges of 45 degrees to 135 degrees and 225 degrees to 315 degrees are assumed to be in the negative bending moment region (the region B1 and the region B2 shown in figure 1).
A first segment 1 is arranged at the center of the top end of the cylindrical tunnel, and second to ninth segments 1 are sequentially arranged from the first segment 1 along the circumference clockwise.
A longitudinal joint (positive bending moment joint 2 or negative bending moment joint 3) is arranged at the joint of each two adjacent segments 1, the five positive bending moment joints 2 are arranged in the positive bending moment areas (A1 and A2 areas), and the four negative bending moment joints 3 are arranged in the negative bending moment areas (B1 and B2 areas).
The nine segments 1 have the same size, so that the distances between adjacent longitudinal joints (positive bending moment joints 2 or negative bending moment joints 3) are equal.
The pipe piece 1 with the positive bending moment joint 2 is arranged at two ends, and the first bolt hand holes 12 are formed at two ends.
The two ends of the pipe piece 1 are provided with the hogging moment joints 3, and the two ends of the pipe piece are provided with second bolt hand holes 14.
The two ends of the pipe piece 1 are respectively provided with a positive bending moment joint 2 and a negative bending moment joint 3, and a first bolt hand hole 12 and a second bolt hand hole 14 are correspondingly formed at the two ends of the pipe piece.
Each positive moment joint 2 includes a pair of first embedments 21 and a first short straight bolt 23.
The pair of first embedded parts 21 are respectively embedded in the two segments 1 connected by the positive bending moment joint 2.
Each first embedment 21 includes a first perforated panel 212, a plurality of first embedded anchors 214, and a first bolt hole 216.
One end of a plurality of first embedded anchor bars 214 is connected to the first perforated panel 212, and the other end is anchored in the duct piece 1.
A first bolt hole 216 is formed in the first perforated panel 212 near the underside of the first perforated panel 212.
The two segments 1 are spliced together, the first perforated panels 212 of the pair of first embedded parts 21 are attached together, the first short straight bolts 23 are penetrated into the two first bolt holes 216 and then locked, and then the two segments 1 can be spliced and fixed. The first perforated panel 212 is flush with the concrete on the joint surface, and the two segments 1 are closely attached to each other except for the caulking area after being assembled.
Each hogging moment joint 3 comprises a pair of second embedments 31 and second short straight bolts 33.
The pair of second embedded parts 31 are respectively embedded in the two segments 1 connected by the hogging moment joint 3.
Each second embedment 31 includes a second perforated panel 312, a plurality of second embedded anchors 314, and second bolt holes 316.
One end of a plurality of second embedded anchor bars 314 is connected to the second perforated panel 312, and the other end is anchored in the duct piece 1.
A second bolt hole 316 is formed in the second perforated panel 312 near the upper side of the second perforated panel 312.
The two segments 1 are spliced together, the second perforated panels 312 of the pair of second embedded parts 31 are attached together, the second short straight bolts 33 are penetrated into the two second bolt holes 316 and then locked, and then the two segments 1 can be spliced and fixed.
The second perforated panel 312 is flush with the concrete on the joint surface, the two duct pieces 1 are tightly attached to each other except for the caulking area after being assembled, and the height of the second perforated panel 312 is lower than the height of the extrados caulking.
The first bolt hand hole 12 and the second bolt hand hole 14 should have a suitable length and width for the first short straight bolt 23 and the second short straight bolt 33 to be placed and screwed.
The height of the perforated panel and the perforated position of the bolt hole are determined according to the bending moment type of the position of the joint, when the joint is positioned in the positive bending moment area, the height of the perforated panel is smaller, the perforated position of the bolt hole is close to the intrados, when the joint is positioned in the negative bending moment area, the height of the perforated panel is larger, and the perforated position of the bolt hole is close to the extrados. As shown in fig. 1, 4 and 5, the height of the first perforated panel 212 is smaller than that of the second perforated panel 312, the first bolt holes 216 are located near the inner arc surface of the cylindrical tunnel, the second bolt holes 316 are located near the outer arc surface of the cylindrical tunnel, the first short straight bolts 23 are located near the inner arc surface of the cylindrical tunnel, the second short straight bolts 33 are located near the outer arc surface of the cylindrical tunnel, and the first bolt hand holes 12 are shallower than the second bolt hand holes 14.
According to the perforated panel, different panel widths and the number of the holes can be set according to different internal force requirements, so that one or more bolts can be configured.
Assuming that the width of the duct piece is b, the height of the concrete compression area is x, the distance between the compression center and the center of the duct piece is k, the concrete strength is fc, the distance between the centroid of the bolt and the center of the duct piece is M, the yield strength of the bolt is fL, the radius is r, the number is N, the bending moment and the axial force applied to the joint are M and N respectively, and the number, the diameter and the strength of the bolts can be determined according to the following steps.
M＝α 1 f c bxk+nπr 2 f L m
N＝α 1 f c bx-nπr 2 f L
Wherein alpha is 1 And the coefficient of the equivalent rectangular stress diagram is taken according to the concrete strength and the concrete structural design specification. Because four unknowns exist in the formula, the number and the strength of the bolts can be firstly assumed, the diameter of the bolts can be obtained through calculation, and the optimal solution is selected after multiple trial calculations.
The width and the number of the holes of the perforated panel, as well as the strength and the diameter of the bolts are determined according to the maximum positive and negative bending moment value and the corresponding axial force value of the joint, and the bolts are required to not yield when the joint is subjected to the internal force value.
The panel anchoring steel bar is determined through calculation, so that the anchoring of the bolt is not damaged before yielding.
The thickness of the embedded panel is calculated and determined, so that the bolt is yielding, the deformation of the panel is small enough, and the specified value of longitudinal joint opening is met.
As shown in fig. 6 to 10, the shield tunnel structure of the present invention of high rigidity in the transverse and longitudinal directions comprises, as viewed in the longitudinal direction, a tenon segment 4, a tenon segment 5, and a girth joint 6 connecting the tenon segment 4 and the tenon segment 5, which are fixedly spliced in the longitudinal direction.
The end of the tenon segment 4 close to the circular seam joint 6 is provided with a tenon 42 inwards.
The end of the tenon segment 5 near the circumferential joint 6 is provided with a tenon 52 protruding outwards.
The circumferential seam joint 6 comprises a quick connector 62 and two sleeves 64 pre-embedded in the tenon segment 4 and the tenon segment 5, respectively.
The quick connector 62 includes a body 622 and two threaded rods 624 extending straight from opposite ends of the body 622.
The body 622 and the two screws 624 are positioned on the same straight line, and the quick connector 62 is in a straight line shape.
Each screw 624 has a diameter gradually decreasing from a connection with the body 622 to a front end farthest from the body 622.
An external thread 6242 is provided on the side wall of each screw 624.
Screw 624 is composed of a steel core surrounded by a polymeric material having a certain strength and hardness.
Two sleeves 64 are pre-embedded in the rebate 42 and the tongue 52, respectively.
The two sleeves 64 can be sleeved outside the two screws 624 to completely encase the screws 624.
Each sleeve 64 has a front end provided with a sleeve front wall 642 covering the front end of the screw 624, a sleeve side wall 644 in the middle covering the external thread 6242 of the screw 624, and a rear end provided with an opening 646 into which the screw 624 is inserted.
The sleeve 64 is made of a polymer material having a certain strength and hardness.
The invention mainly comprises the following steps in the construction process:
step 1: the first embedded part 21 and the second embedded part 31 are respectively positioned and embedded in the corresponding duct piece 1, and attention is paid to the fact that the first embedded part 21 is arranged in the positive bending moment area, and the second embedded part 31 is arranged in the negative bending moment area; when the tenon segment 4 and the tenon segment 5 are poured, the quick connector 62 is positioned, and the two sleeves 64 are respectively pre-buried in the concrete of the tenon segment 4 and the tenon segment 5.
Step 2: the rebate 42 and the tenon 52 on two sides of the circular seam of the spliced rebate duct piece 4 and the tenon duct piece 5 are prefabricated and formed by duct piece templates, so that the geometric precision of the rebate structure is ensured in the forming process, and the condition that the duct piece is difficult to assemble in the assembling construction process is prevented.
Step 3: between the segment make-up operations, a screw 624 of the quick connector 62 is screwed into the tenon connecting hole 522 formed by the sleeve 64 pre-buried in the tenon 52, and whether or not it is screwed in place is checked.
Step 4: with the help of the assembly machine, the quick connector 62 is aligned to the tenon connecting hole 422 formed by the sleeve 64 pre-embedded in the tenon 42, after the measurement check is accurate, the jack of the shield machine returns, and the quick connector 62 is extruded in place under the action of the jack.
Step 5: and (3) repeating the step (3) and the step (4) to assemble and fix all the tenon segments (4) and the tenon segments (5).
Step 6: in the positive bending moment region, the first short straight bolts 23 are inserted into the first bolt holes 216 of the two first embedded parts 21 and then locked.
Step 7: in the hogging moment region, the second short straight bolts 33 are inserted into the second bolt holes 316 of the two second embedded parts 31 and then locked.
Step 8: and (6) repeating the step (6) and the step (7), and assembling and fixing all the duct pieces (1).
In the above embodiment, each positive moment joint 2 includes only one pair of first embedded parts 21, each negative moment joint 3 includes only one pair of second embedded parts 31, and in other embodiments, each positive moment joint 2 may include two, three or more pairs of first embedded parts 21, and each negative moment joint 3 may include two, three or more pairs of second embedded parts 31, as required by specific design and construction. These first embedments 21 are equally divided into two parts and then respectively embedded in two segments 1 connected by the positive bending moment joint 2. These second embedments 31 are equally divided into two parts and then respectively embedded in two segments 1 connected by the hogging moment joint 3.
In the above embodiments, the sizes of the segments 1 are the same for illustration only, and in other embodiments, the sizes of the segments 1 may be different depending on the specific design and construction requirements.
In the above embodiment, the positive bending moment areas (A1 and A2 areas) and the negative bending moment areas (B1 and B2 areas) include nine segments 1, five positive bending moment joints 2 and four negative bending moment joints 3, where the number of nine, five and four positive bending moment areas are in the range of 0 ° to 45 °, 135 ° to 225 °, 315 ° to 360 °, and the negative bending moment areas are in the range of 45 ° to 135 ° and 225 ° to 315 °, which are illustrative examples, and in other embodiments, the actual positive and negative bending moment areas are determined according to the designed calculation result of the forces in the tunnel, and the number of parts and the specific positions of the positive and negative bending moment areas are all changed.
In other embodiments, the above steps 3 and 4 may be modified, that is, changed to:
step 3: between the segment make-up operations, a screw 624 of the quick connector 62 is threaded into a rebate connection hole 422 formed by the pre-embedded sleeve 64 in the rebate 42 and checked for threading into place.
Step 4: with the help of the assembly machine, the quick connector 62 is aligned to the tenon connecting hole 522 formed by the sleeve 64 pre-embedded in the tenon 52, after the measurement check is accurate, the jack of the shield machine returns, and the quick connector 62 is extruded in place under the action of the jack.
The other steps are unchanged.
The invention has the following beneficial effects:
1. compared with the traditional pipe piece joint in which bolts are arranged at the position of the inner arc surface, the structure disclosed by the invention can enable the hogging moment joint 3 to rapidly play a role when being subjected to hogging moment, and inhibit the longitudinal joint between two pipe pieces 1 from being opened, so that the structural deformation is reduced, the tunnel has higher rigidity in the transverse direction, the ground subsidence is more favorably controlled, and the structure is more suitable for engineering with high requirements on the rigidity of the tunnel structure.
2. According to the invention, the position of the joint bolt is changed according to the stress characteristic of the joint, the bolt performance can be fully utilized, the deformation of the joint under the action of the hogging moment is reduced, the overall rigidity of the structure in the transverse direction can be improved, and the method has greater advantages for shield engineering with high requirements on ground surface subsidence, such as tunnel crossing airport runway, history crossing protection building and the like.
3. The invention combines the advantages of the quick connecting piece 62 and the concave-convex tenons, can provide enough shear strength for the circular seam, and simultaneously, compared with the traditional circular seam bending bolt and the traditional inclined bolt, the quick connecting piece 62 greatly improves the rigidity of the tunnel in the longitudinal direction, does not need manual installation, can effectively improve the construction speed, greatly reduces the construction cost, and can be popularized in similar processes.
4. The invention adopts a novel structure in the transverse direction and the longitudinal direction of the tunnel, can simultaneously improve the transverse rigidity and the longitudinal rigidity of the tunnel, and is more suitable for shield engineering with high requirements on ground subsidence, such as tunnel underpass airport runway, underpass history protection building and the like.
Claims (10)
1. The transverse and longitudinal high-rigidity shield tunnel structure is characterized by comprising a plurality of duct pieces (1) which are spliced and fixed in sequence in the cross section to form a cylindrical tunnel, a plurality of positive bending moment joints (2) and a plurality of negative bending moment joints (3) which are connected with the duct pieces (1), a tenon duct piece (4) and a tenon duct piece (5) which are spliced and fixed in the longitudinal direction, and a circular seam joint (6) which is connected with the tenon duct piece (4) and the tenon duct piece (5);
the cylindrical tunnel formed by splicing and fixing the plurality of segments (1) comprises a positive bending moment area and a negative bending moment area;
the positive bending moment connectors (2) or the negative bending moment connectors (3) are respectively arranged at the joint of every two adjacent duct pieces (1), the positive bending moment connectors (2) are arranged in the positive bending moment area, and the negative bending moment connectors (3) are arranged in the negative bending moment area;
the two ends of the duct piece (1) are provided with positive bending moment joints (2), and the two ends of the duct piece are provided with first bolt hand holes (12);
the two ends of the duct piece (1) are provided with hogging moment joints (3), and the two ends of the duct piece are provided with second bolt hand holes (14);
the two ends of the pipe piece (1) are respectively provided with a positive bending moment joint (2) and a negative bending moment joint (3), and a first bolt hand hole (12) and a second bolt hand hole (14) are correspondingly formed at the two ends of the pipe piece;
each positive bending moment joint (2) comprises at least one pair of first embedded parts (21) and at least one first short straight bolt (23);
the at least one pair of first embedded parts (21) are equally divided into two parts and then are respectively embedded in two duct pieces (1) connected by the positive bending moment joint (2), and each first embedded part (21) comprises a first perforated panel (212) and at least one first bolt hole (216) formed in the first perforated panel (212);
the two duct pieces (1) are spliced together, the first perforated panels (212) of the at least one pair of first embedded parts (21) are attached together, and the first short straight bolts (23) penetrate through the first bolt holes (216) of the at least one pair of first embedded parts (21) to be locked, so that the two duct pieces (1) can be spliced and fixed;
each hogging moment joint (3) comprises at least one pair of second embedded parts (31) and at least one second short straight bolt (33);
the at least one pair of second embedded parts (31) are equally divided into two parts and then are respectively embedded in two duct pieces (1) connected by the hogging moment joint (3), and each second embedded part (31) comprises a second perforated panel (312) and at least one second bolt hole (316) formed in the second perforated panel (312);
the two duct pieces (1) are spliced together, the second perforated panels (312) of the at least one pair of second embedded parts (31) are attached together, and the second short straight bolts (33) penetrate through the second bolt holes (316) of the at least one pair of second embedded parts (31) to be locked, so that the two duct pieces (1) can be spliced and fixed;
the height of the first perforated panel (212) is smaller than that of the second perforated panel (312), the first bolt holes (216) and the first short straight bolts (23) are positioned close to the inner arc surface of the cylindrical tunnel, the second bolt holes (316) and the second short straight bolts (33) are positioned close to the outer arc surface of the cylindrical tunnel, and the first bolt hand holes (12) are shallower than the second bolt hand holes (14);
the end part of the tenon segment (4) close to the circular seam joint (6) is internally provided with a tenon (42);
the end part of the tenon segment (5) close to the circular seam joint (6) is provided with a tenon (52) in a protruding way to the outside;
the circular seam joint (6) comprises a linear quick connecting piece (62) and two sleeves (64) which are respectively embedded in the tenons (42) and the tenons (52);
the quick connector (62) comprises a body (622) and two screws (624) extending from two ends of the body (622) in a straight line.
2. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein each first embedded part (21) further comprises a plurality of first embedded anchor bars (214), one end of each first embedded anchor bar (214) is connected to the first perforated panel (212), and the other end of each first embedded anchor bar is anchored in the duct piece (1); each second embedded part (31) further comprises a plurality of second embedded anchor bars (314), one end of each second embedded anchor bar (314) is connected to the second perforated panel (312), and the other end of each second embedded anchor bar is anchored in the duct piece (1).
3. The transverse and longitudinal high stiffness shield tunnel structure of claim 1, wherein the first bolt holes (216) are adjacent to the underside of the first aperture panel (212) and the second bolt holes (316) are adjacent to the upper side of the second aperture panel (312).
4. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein the first perforated panel (212) is flush with the concrete on the joint surface, and the two segments (1) are closely attached to each other except for a caulking area after being assembled; the second perforated panel (312) is flush with the concrete on the joint surface, the two duct pieces (1) are closely attached to each other except for the caulking area after being assembled, and the height of the second perforated panel (312) is lower than the height of the external cambered surface caulking.
5. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein the number of the plurality of duct pieces (1) is nine, the number of the plurality of positive bending moment joints (2) is five, and the number of the plurality of negative bending moment joints (3) is four;
the cylindrical tunnel formed by splicing nine duct pieces (1) is in the range of 0-45 degrees, 135-225 degrees and 315-360 degrees, the positive bending moment area is formed by the cylindrical tunnel, the center of the circle of the cylindrical tunnel is vertically upwards in the directions of 0-360 degrees, and the negative bending moment area is formed by the cylindrical tunnel in the ranges of 45-135 degrees and 225-315 degrees;
a first segment (1) is arranged at the center of the top end of the cylindrical tunnel, and second to ninth segments (1) are sequentially arranged from the first segment (1) along the circumference clockwise;
and each two adjacent duct pieces (1) are respectively provided with a positive bending moment joint (2) or a negative bending moment joint (3), the five positive bending moment joints (2) are arranged in the positive bending moment area, and the four negative bending moment joints (3) are arranged in the negative bending moment area.
6. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein the body (622) and the two screws (624) are located on the same straight line.
7. The transverse and longitudinal high rigidity shield tunnel structure according to claim 1, wherein each screw (624) has a diameter gradually decreasing from a connection with the body (622) to a front end farthest from the body (622).
8. The shield tunnel structure of claim 1, wherein the front end of each sleeve (64) is provided with a sleeve front wall (642) covering the front end of the screw (624), the middle is provided with a sleeve side wall (644) covering the screw (624), and the rear end is provided with an opening (646) for inserting the screw (624).
9. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein the tenons (42) and the tenons (52) are prefabricated by duct piece templates, and geometric accuracy of the tenon-and-mortise structure is ensured in the shaping process.
10. The transverse and longitudinal high-rigidity shield tunnel structure according to claim 1, wherein one screw (624) of the quick connector (62) is screwed into a tenon connecting hole (522) formed by a sleeve (64) pre-embedded in the tenon (52), and the other screw (624) of the quick connector (62) is extruded into a tenon connecting hole (422) formed by the sleeve (64) pre-embedded in the tenon (42) under the action of a shield machine jack and is extruded into place; or one screw (624) of the quick connector (62) is screwed into a tenon connecting hole (422) formed by a sleeve (64) pre-buried in the tenon (42), and the other screw (624) of the quick connector (62) is extruded into a tenon connecting hole (522) formed by the sleeve (64) pre-buried in the tenon (52) under the action of a jack of a shield tunneling machine and is extruded in place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310944275.XA CN117005888A (en) | 2023-07-30 | 2023-07-30 | Transverse and longitudinal high-rigidity shield tunnel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310944275.XA CN117005888A (en) | 2023-07-30 | 2023-07-30 | Transverse and longitudinal high-rigidity shield tunnel structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117005888A true CN117005888A (en) | 2023-11-07 |
Family
ID=88568547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310944275.XA Pending CN117005888A (en) | 2023-07-30 | 2023-07-30 | Transverse and longitudinal high-rigidity shield tunnel structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117005888A (en) |
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2023
- 2023-07-30 CN CN202310944275.XA patent/CN117005888A/en active Pending
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