CN109356612B - Assembling method of shield segments for standing type prototype structure test - Google Patents
Assembling method of shield segments for standing type prototype structure test Download PDFInfo
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- CN109356612B CN109356612B CN201811201534.5A CN201811201534A CN109356612B CN 109356612 B CN109356612 B CN 109356612B CN 201811201534 A CN201811201534 A CN 201811201534A CN 109356612 B CN109356612 B CN 109356612B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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Abstract
The invention relates to an assembling method of shield segments for a standing type prototype structure test, which comprises the following steps: installing a lower loading device; hoisting each pipe piece block in the test pipe piece, which is correspondingly positioned in the lower loading device, adjusting the position of each hoisted pipe piece block and completing the connection among the hoisted pipe piece blocks; mounting a support structure on the connected pipe piece block in the lower loading device; hoisting the rest segment blocks to be assembled in the test segment to the support structure and the connected segment blocks, adjusting the position of the segment blocks to be assembled and completing the connection; and installing an upper loading device on the lower loading device and removing the support structure. The method simulates the assembling process of the shield segment in actual construction, the test result has more reference value, and effective guidance can be provided for the actual construction of the segment.
Description
Technical Field
The invention relates to the technical field of shield tunnels, in particular to an assembling method of shield segments for a standing prototype structure test.
Background
The safety and stability of the lining structure are not only related to the structural safety and durability of the shield tunnel, but also related to the difficulty and risk of construction. Before the construction of a large shield tunnel or after the research and development of a novel shield tunnel structure, a prototype whole-ring segment mechanical loading test becomes an indispensable research means for checking the stability of the tunnel structure and optimizing the structural design. Because the scale reduction effect of an indoor model test is overcome, the structural integrity which cannot be achieved by a full-scale single duct piece or joint mechanical loading test is realized, the stress state of the duct piece structure under different assembling modes, different hydrogeological conditions and different stress modes can be simulated under multiple working conditions, and the multi-functional test platform has more multifacetability, repeatable operability and flexibility compared with a field test. However, the shield segment has the reasons of large self gravity, high requirement on assembly precision, high assembly safety risk, high test cost and the like, and home and abroad prototype tests on the shield tunnel segment structure are carried out on the basis of a flat-lying type.
However, research results prove that the lying shield segment mechanical loading test cannot consider the important influence of the actual segment assembling error and segment self weight on the internal force and deformation of the segment structure no matter the round or special-shaped shield tunnel lining structure, and the test results still have to be considered. Therefore, finding a safe and efficient standing type shield segment assembling method which meets the assembling precision is particularly important for researching the real stress characteristics and deformation rules of the shield tunnel structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for assembling shield segments for a standing type prototype structure test, and solves the problem that the test result of the existing horizontal shield segment mechanical loading test needs to be considered due to the fact that the actual segment assembling error and the important influence of segment self weight on the internal force and deformation of a segment structure cannot be considered.
The technical scheme for realizing the purpose is as follows:
the invention provides a method for assembling shield segments for a standing prototype structure test, which comprises the following steps:
installing a lower loading device;
hoisting each pipe piece block in the test pipe piece, which is correspondingly positioned in the lower loading device, into the lower loading device, adjusting the position of each hoisted pipe piece block and completing the connection among the hoisted pipe piece blocks;
mounting a support structure on the connected pipe piece block in the lower loading device;
hoisting the rest segment blocks to be assembled in the test segment to the support structure and the connected segment blocks, adjusting the position of the segment blocks to be assembled and completing the connection; and
and installing an upper loading device on the lower loading device and removing the supporting structure, thereby completing the standing type assembly of the test segment.
The invention provides a test segment standing type assembling method, which simulates the assembling process of shield segments in actual construction, so that the test of the test segments can fully consider the assembling error of the actual segments and the influence of segment self-weight on the internal force and deformation of the segment structure.
The assembling method of the shield segment for the standing type prototype structure test of the invention is further improved in that the method also comprises the step of setting the length of the hoisting cable before hoisting the segment block:
acquiring the hanging hole position and the centroid coordinate of each pipe piece block;
and calculating the lengths of the suspension cables corresponding to the pipe pieces according to the obtained suspension hole positions and the centroid coordinates, so that the hoisting postures of the pipe pieces can be consistent with the set assembling postures of the pipe pieces when the pipe pieces are hoisted according to the lengths of the suspension cables.
The assembling method of the shield segment for the standing type prototype structure test is further improved in that when all the segment blocks are hoisted, hoisting is carried out according to the lengths of the hoisting cables corresponding to the segment blocks.
The invention further improves the assembling method of the shield segment for the standing type prototype structure test, and the step of hoisting each segment block, which is correspondingly positioned in the lower loading device, in the test segment to the lower loading device comprises the following steps:
positioning the position of the tube piece block at the bottom in the lower loading device, and hoisting the tube piece block at the bottom to the positioned position;
and alternately hoisting the tube piece blocks positioned on the two sides of the tube piece block positioned at the bottom and keeping the hoisting state.
The invention further improves the assembling method of the shield segment for the standing type prototype structure test, wherein the steps of adjusting the positions of all the segment blocks to be hoisted and completing the connection among all the segment blocks to be hoisted comprise the following steps:
hoisting the segment block at the bottom and positioning and placing the segment block in the lower loading device;
hoisting the rest segment blocks into the lower loading device, and keeping the hoisting state;
under the condition of keeping a hoisting state, preliminarily connecting circumferential bolts among the segment blocks in the lower loading device;
and adjusting the position of the corresponding segment block in the lower loading device to a set position by using a jack in the lower loading device, and adding the pre-tightening force of the circumferential bolt between the segment blocks in the lower loading device to a set value to complete the connection between the segment blocks in the lower loading device.
The invention further improves the assembling method of the shield segment for the standing type prototype structure test, and the step of adjusting the position of the corresponding segment block in the lower loading device to a set position by using a jack in the lower loading device comprises the following steps:
setting two target points on each pipe piece block;
after the lower loading device is installed, positioning new coordinates of the target point on each segment block in the lower loading device;
and adjusting the telescopic amount of the jack according to the new coordinates of the target point so that the target point on the corresponding segment block is correspondingly positioned at the new coordinates of the target point, thereby completing the position adjustment of the segment block.
The invention further improves the assembling method of the shield segments for the standing type prototype structure test, wherein the step of installing the supporting structure comprises the following steps:
assembling a support structure main body, and arranging corresponding triangular support frames on the support structure main body corresponding to two end parts of each pipe piece block;
the triangular support frame is provided with an adjustable support piece which can move and adjust along the direction vertical to the inner cambered surface of the corresponding pipe piece;
and arranging a temporary supporting structure for supporting and connecting the supporting structure at the outer side of the lower loading device.
The assembly method of the shield segment for the standing type prototype structure test is further improved in that the step of adjusting the position of the segment block to be assembled comprises the following steps:
the adjustable supporting pieces are adjusted towards the direction close to or far away from the intrados of the corresponding pipe piece block, so that the position of the pipe piece block to be assembled is adjusted in place.
The invention further improves the assembling method of the shield segment for the standing type prototype structure test, and the step of hoisting the rest segment blocks to be assembled in the test segment to the supporting structure and the connected segment blocks comprises the following steps:
alternately hoisting the segment blocks correspondingly connected with the segment blocks in the lower loading device, and keeping a hoisting state;
and hoisting the segment block positioned at the top and keeping the hoisting state.
The invention further improves the assembling method of the shield segments for the standing type prototype structure test, and the assembling method also comprises the following steps:
under the condition of keeping the hoisting state, preliminarily connecting the hoisted segment blocks to be assembled with the corresponding hoop bolts among the segment blocks in the lower loading device;
and under the condition of keeping the hoisting state, preliminarily connecting the segment block positioned at the top with the corresponding circumferential bolts among the segment blocks.
Drawings
Fig. 1 is a flow chart of the assembling method of the shield segments for the standing prototype structure test of the invention.
Fig. 2 to 7 are schematic structural diagrams of the hoisting state of each segment block in a preferred embodiment of the stand-up prototype structure test shield segment according to the present invention.
Fig. 8 to 16 are schematic exploded steps of the assembling method of the shield segments for the standing prototype structure test of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides an assembling method of a stand-type prototype structure test shield segment, which solves the technical problem that the shield segment for the test cannot be placed in a stand-type manner for a long time, greatly improves assembling efficiency while ensuring assembling precision, and provides favorable technical support for a mechanical loading test of the stand-type shield segment. The assembling method of the shield segments for the standing type prototype structure test of the invention is explained below with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of the assembling method of the shield segments for the standing prototype structure test of the invention is shown. The assembling method of the shield segments for the standing type prototype structure test of the invention is explained with reference to fig. 1.
As shown in fig. 1, the assembling method of the shield segments for the standing type prototype structure test of the invention comprises the following steps:
executing step S11, installing a lower loading device; then, step S12 is executed;
step S12 is executed, the segment block is hoisted into the lower loading device and is adjusted to the right position to complete connection; hoisting each pipe piece block in the test pipe piece, which is correspondingly positioned in the lower loading device, into the lower loading device, adjusting the position of each hoisted pipe piece block and completing the connection among the hoisted pipe piece blocks; then, step S13 is executed;
step S13 is executed, a supporting structure is installed on the tube piece block; mounting a support structure on the connected pipe piece block in the lower loading device; then, step S14 is executed;
step S14 is executed, other pipe piece blocks are hoisted and adjusted in place to complete connection; hoisting the rest segment blocks to be assembled in the test segment to the support structure and the connected segment blocks, adjusting the position of the segment blocks to be assembled and completing the connection between the segment blocks to be assembled and the connected segment blocks and the connection between the segment blocks to be assembled; then, step S15 is executed;
step S15 is executed, the upper loading device is installed and the support structure is removed; and (3) installing an upper loading device on the lower loading device and removing the supporting structure, thereby completing the standing type assembly of the test segment.
The assembling method realizes that the standing test segment is clamped by the lower loading device and the upper loading device, so that the simulation test of the test segment is the same as the actual state of the segment in shield construction, and the actual stress condition of the segment can be better simulated; in addition, each segment block in the test segment is hoisted and assembled block by block, so that the assembling process of the shield pipe in actual construction is truly simulated, the assembling error of the actual segment and the influence of the self weight of the segment on the internal force and deformation of the segment structure can be fully considered in the test of the test segment, and the problem of the lying test segment is solved. The standing type assembling method provided by the invention can enable the test result of the test segment to have a reference value, and can provide effective guidance for the actual construction of the segment.
The assembling method is suitable for different duct piece types, and can be used for assembling circular duct pieces, rectangular duct pieces, similar rectangular duct pieces and special-shaped duct pieces. Fig. 2 to 16 show the assembling process of the quasi-rectangular tube piece, and the assembling method of the present invention will be described below by taking the quasi-rectangular test tube piece as an example.
As shown in fig. 2 to 7, which show the hoisting state of 6 tube pieces, in the example of the rectangular-like test tube piece, the test tube piece includes a first tube piece 21, a second tube piece 22, a third tube piece 23, a fourth tube piece 24, a fifth tube piece 25 and a sixth tube piece 26; the six pipe piece blocks are sequentially connected in a butt joint mode so as to be assembled to form the test pipe piece. As shown in fig. 14, the standing state of the assembled test segment means a state in which the test segment is erected on the lower loading device 41 with the outer arc surface of the first segment 21 as the bottom surface, and the lying state of the assembled test segment means a state in which the test segment is placed on the ground with the annular surface of each segment 21 as the bottom surface.
As a preferred embodiment of the present invention, before hoisting the segment block, the method further comprises the step of setting the length of the hoist cable:
acquiring the hanging hole position and the centroid coordinate of each pipe piece block;
and calculating the lengths of the suspension cables corresponding to the pipe pieces according to the obtained positions of the suspension holes and the centroid coordinates, so that the hoisting postures of the pipe pieces can be consistent with the set assembling postures of the pipe pieces when the pipe pieces are hoisted according to the lengths of the suspension cables. The length of the hoist cable is the distance from the hoist point (the point where the hoist cable is connected to the crane) to the point where the hoist cable is connected to the segment (i.e., the location of the hoist eye).
Furthermore, when all the pipe piece blocks are hoisted, hoisting is carried out according to the lengths of the hoisting cables corresponding to the pipe piece blocks.
Specifically, as shown in fig. 2, hanging holes 213 are symmetrically formed at both sides of the centroid position 212 of the first pipe segment block 21, and the hanging holes 213 are used for connecting the hanging cables 31. As shown in fig. 3, the second pipe segment 22 is symmetrically provided with hanging holes 223 at both sides of the centroid position 222, and the hanging holes 223 are used for connecting the hanging cables 31. As shown in fig. 4, the third pipe segment 23 is symmetrically provided with hanging holes 233 at both sides of the centroid position 232, and the hanging holes 233 are used for connecting the hanging cables 31. As shown in fig. 5, the fourth pipe segment 24 is symmetrically provided with hanging holes 243 at both sides of the centroid position 242, and the hanging holes 243 are used for connecting the hanging cables 31. As shown in fig. 6, the fifth pipe segment 25 is symmetrically provided with hanging holes 253 at both sides of the centroid position 252, and the hanging holes 253 are used for connecting the hanging cables 31. As shown in fig. 7, the sixth pipe segment 26 is symmetrically provided with hanging holes 263 at both sides of the centroid position 262, and the hanging holes 263 are used for connecting the hanging cables 31.
Before the segment blocks are hoisted, the centroid coordinates and the coordinates of the hoisting hole positions of the segment blocks are calculated by drawing software such as AutoCAD; the length of the suspension cable 31 of the pipe piece blocks in the assembly posture can be calculated through the positions of the two suspension holes on the pipe piece blocks and the centroid coordinates, the length of the suspension cable 31 of each pipe piece block is correspondingly obtained, two suspension holes are formed in each pipe piece block, the suspension cable 31 is connected to each suspension hole, the other ends of the suspension cables 31 connected to the two suspension holes are connected together to form a suspension point, and the length of the suspension cable is the distance between the suspension point and the suspension hole in the lifting state.
When the pipe piece blocks are hoisted according to the length of the hoisting cable, the hoisting posture of the pipe piece blocks after hoisting is consistent with the assembling posture on the design drawing; make the section of jurisdiction piece tentatively be the gesture of assembling after lifting by crane, be favorable to the subsequent position control of section of jurisdiction piece, can improve the precision of assembling of section of jurisdiction piece. As another preferred embodiment of the present invention, as shown in fig. 8 to 10, the step of hoisting each tube piece block of the test tube piece corresponding to the lower loading unit 41 into the lower loading unit 41 includes:
positioning the position of the tube piece block (namely the first tube piece block 21) at the bottom in the lower loading device 41, and hoisting the tube piece block at the bottom to the positioned position, wherein the tube piece block at the bottom is placed in the lower loading device 41;
and alternately hoisting the pipe piece blocks positioned at two sides of the bottom pipe piece block and keeping the hoisting state. The segment blocks on the two sides can be hoisted alternately, the structural stability of the segment can be guaranteed, the instability of the segment structure can be avoided, and the segment blocks can be hoisted alternately in a left-right or right-left mode. In the embodiment shown in fig. 8 to 10, the second pipe segment 22 and the third pipe segment 23 are arranged on both sides of the first pipe segment 21, and the hoisting sequence shown is that the second pipe segment 22 is hoisted first, and then the third pipe segment 23 is hoisted. Naturally, the assembling method of the invention can also be that more than one pipe piece block is arranged on the two sides of the pipe piece block at the bottom, and the alternate hoisting of the pipe piece blocks under the condition refers to that one pipe piece block at one side is hoisted firstly, then one pipe piece block at the other side is hoisted, then the other pipe piece block at one side is hoisted, and then the other pipe piece block at the other side is hoisted, namely, the left side and the right side are hoisted alternately, so as to ensure the integral stability of the structure after the pipe piece blocks are assembled.
As another preferred embodiment of the present invention, as shown in fig. 8 to 10, the step of adjusting the position of each segment to be lifted and completing the connection between the segments to be lifted comprises:
hoisting the segment block at the bottom and positioning and placing the segment block in the lower loading device 41;
hoisting the rest of the duct piece blocks outside the duct piece block at the bottom in the lower loading device into the lower loading device, and keeping the hoisting state;
under the condition of keeping a hoisting state, preliminarily connecting circumferential bolts among the segment blocks in the lower loading device;
adjusting the position of the corresponding segment block in the lower loading device 41 to a set position by using the jack 411 in the lower loading device 41, and adding the pre-tightening force of the circumferential bolt between the segment blocks in the lower loading device 41 to a set value to complete the connection between the segment blocks in the lower loading device 41.
Further, the step of adjusting the position of the corresponding tube piece in the lower loading device 41 to the set position by using the jack 411 in the lower loading device 41 includes:
setting two target points on each pipe piece block;
after the lower loading device 41 is installed, positioning new coordinates of the target point on each segment block in the lower loading device 41;
the amount of expansion of the jack 411 is adjusted according to the new coordinates of the target point, so that the target point on the corresponding segment block is correspondingly located at the new coordinates of the target point, thereby completing the position adjustment of the segment block.
Specifically, two target points 211 are disposed on the first tube sheet block 21, and preferably, the two target points 211 are disposed at two end portions of the first tube sheet block 21. Two target points 221 are provided on the second tube sheet block 22, and preferably, the two target points 221 are provided at both end portions of the second tube sheet block 22. Two target points 231 are provided on the third tube sheet block 23, and preferably, the two target points 231 are provided at both end portions of the third tube sheet block 23. Two target points 241 are provided on the fourth tube sheet block 24, and preferably, two target points 241 are provided at both end portions of the fourth tube sheet block 24. Two target points 251 are provided on the fifth tube sheet 25, and preferably, the two target points 251 are provided at both end portions of the fifth tube sheet 25. Two target points 261 are provided on the sixth tube piece 26, and preferably, the two target points 261 are provided at both end portions of the sixth tube piece 26.
When setting a target point, pre-assembling the first pipe piece block 21 to the sixth pipe piece block 26 on the ground, wherein the pre-assembled ground is a flat surface; then, acquiring coordinates of target points arranged on each tube piece block by using a total station; therefore, the coordinates of the target point when the segment block is positioned on the ground are obtained.
The above-described process of adjusting the tube piece will be described below by taking the assembly of the first tube piece 21 to the third tube piece 23 as an example.
Positioning the first tube piece block 21 in the lower loading device 41, further comprising, before positioning: the corresponding axial symmetry position of the lower loading device is positioned on the first tube piece block 21 (namely, the tube piece block positioned at the bottom) through a design drawing, so that the first tube piece block and the lower loading device are positioned in the same vertical direction, and the new coordinates of the target points on the tube piece blocks are calculated. The new coordinates of the calculated target point are coordinates in a coordinate system corresponding to the position of the lower loading device 41, and at this time, the new coordinates can be converted according to the coordinates of the target point on the ground of the segment block obtained when the target point is set. The first pipe piece 21 is lifted into the lower loading device 41 according to the positioning position of the first pipe piece 21, a plurality of jacks 411 and supports are arranged on the inner side of the lower loading device 41, the supports are arranged at positions corresponding to the positions where the first pipe piece 21 is placed, the extrados of the first pipe piece 21 is placed on the corresponding supports, and the first pipe piece 21 is positioned on the supports, namely the target point on the first pipe piece 21 corresponds to the position of the new coordinate of the target point; then hoisting the second pipe piece 22 to a corresponding position, primarily connecting the circumferential bolts at the butt joint positions of the second pipe piece 22 and the first pipe piece 21 under the condition of keeping the hoisting state, arranging the extrados of the second pipe piece 22 on the corresponding jacks 411, adjusting the extension amount of the corresponding jacks 411 according to the calculated new coordinates of the target point of the second pipe piece 22 to adjust the second pipe piece 22 in place, and adding the circumferential bolt pre-tightening force between the second pipe piece 22 and the first pipe piece 21 to a set value to complete the assembly of the second pipe piece 22 and the first pipe piece 21. The process of lifting the third pipe segment 23 is the same as the process of lifting the second pipe segment 22, and is not described herein again.
As still another preferred embodiment of the present invention, as shown in fig. 11, the step of installing the support structure 41 includes:
assembling the supporting structure body 431, and arranging corresponding triangular supporting frames 432 on the supporting structure body 431 corresponding to the two end parts of each pipe piece block;
the triangular support frame 432 is provided with an adjustable support piece which can move and adjust along the direction vertical to the intrados of the corresponding pipe piece;
a temporary support structure for supporting the connection support structure is provided at the outer side of the lower loading unit 41.
Preferably, the supporting structure body 431 is a frame structure formed by connecting rods in a transverse and longitudinal direction, and has high stability. The overall support structure 41 is of a centrosymmetric structure, making it self-stabilizing as a whole.
The temporary support structure may be supported on the ground and may also be connected to a stabilizing structure near the lower loading unit 41 to provide stable support for the support structure 41.
The triangular support frame 432 that sets up corresponds the intrados setting of pipe piece, and the adjustable brace piece that sets up on triangular support frame 432 can support and lean on the intrados of pipe piece to through adjusting the extension length of adjustable brace piece, can realize the position of accurate regulation pipe piece. Preferably, the adjustable supporting piece should avoid the position of the seam and the hand hole of the pipe piece, so that the adjustable supporting piece can abut against the intrados of the pipe piece.
Further, as shown in fig. 12 to 14, the step of adjusting the position of the pipe piece blocks to be assembled includes:
the adjustable supporting pieces are adjusted towards the direction close to or far away from the intrados of the corresponding pipe piece block, so that the position of the pipe piece block to be assembled is adjusted in place.
Preferably, a threaded hole is formed at the vertex of the triangular support frame 432, and the adjustable support member is preferably a screw rod, which is screwed into the threaded hole, so that the screw rod can be rotated to adjust the extending length of the screw rod, and further, the position of the tube piece can be adjusted.
As still another preferred embodiment of the present invention, as shown in fig. 12 to 14, the step of hoisting the remaining segment pieces to be assembled of the test segment to the support structure and the connected segment pieces comprises:
alternately hoisting the segment blocks correspondingly connected with the segment blocks in the lower loading device 41 and keeping the hoisting state;
and hoisting the segment block positioned at the top and keeping the hoisting state.
When the segment blocks to be assembled are hoisted, the hoisted segment blocks are placed on the corresponding supporting structures 43, and the hoisted segment blocks are supported by the supporting structures 43 without loosening a crane.
Further, still include:
under the condition of keeping the hoisting state, preliminarily connecting the hoisted segment blocks to be assembled with the annular bolts among the segment blocks in the corresponding lower loading device; and then the segment blocks are adjusted in place through the adjustable supporting pieces, when the extending length of the adjustable supporting pieces is adjusted, the segment blocks are adjusted according to the new coordinates of the target points of the segment blocks, and after the segment blocks are adjusted in place, the pretightening force of the reversing bolts between the segment blocks in the segment blocks and the lower recording device is added to a set value.
And under the condition of keeping the hoisting state, the segment blocks positioned at the top are preliminarily connected with the corresponding circumferential bolts among the segment blocks. Then adjust the section of jurisdiction piece through adjustable support piece and target in place, when adjusting the extension length of adjustable support piece, adjust according to the new coordinate of the target point of section of jurisdiction piece, treat that the section of jurisdiction piece is adjusted after target in place, add the pretightning force of the switching-over bolt between the section of jurisdiction piece to the setting value.
The following describes a process of adjusting the tube pieces by taking the assembly of the fourth tube piece 24 to the sixth tube piece 26 as an example. As shown in fig. 12, the fourth pipe piece 24 is hoisted to the supporting structure 43, the fourth pipe piece 24 is connected with the end of the second pipe piece 22, the fourth pipe piece 24 is dropped and then kept in a hoisting state, that is, a crane is not loosened, and the circumferential bolts at the end of the fourth pipe piece 24 and the end of the second pipe piece 22 are primarily connected; then, the position of the fourth pipe piece block 24 is adjusted according to the new coordinate of the target point on the fourth pipe piece block 24, the fourth pipe piece block 24 is driven to carry out position adjustment by adjusting the extension length of the adjustable supporting piece until the target point on the fourth pipe piece block 24 is located at the position of the new coordinate of the target point, the position adjustment of the fourth pipe piece block 24 is completed, and then the pre-tightening force of the circumferential bolts of the fourth pipe piece block 24 and the second pipe piece block 22 is added to a set value. Next, as shown in fig. 13, the fifth pipe segment 25 is hoisted, the fifth pipe segment 25 is butted with the third pipe segment 23, and the hoisting and adjusting processes of the fifth pipe segment 25 are the same as the adjusting process of the fourth pipe segment 24, and are not described again here. After the fifth pipe segment 25 is assembled, as shown in fig. 14, the sixth pipe segment 26 (i.e., the pipe segment located at the top) is hoisted, the sixth pipe segment 26 is dropped on the corresponding triangular support frame on the support structure 43, and under the condition of keeping the hoisting state, the end of the sixth pipe segment 26 is primarily connected with the circumferential bolts of the end of the corresponding fourth pipe segment 24 and the end of the fifth pipe segment 25, and then the adjustable support member is adjusted to make the target point of the sixth pipe segment 26 be located at the position of the new coordinate of the target point, and then the pretightening force of the circumferential bolt of the sixth pipe segment 26 is added to the design value. The assembly of a prototype structure of test segments is completed.
As shown in fig. 15, after the test tube piece block is assembled, the upper loading device 42 is installed, then as shown in fig. 16, the supporting structure 43 is removed, the jacks arranged on the inner side surfaces of the lower loading device 41 and the upper loading device 42 in the vertical state lean against the extrados of the test tube piece, the test tube piece is also arranged in the vertical state, namely, the stand-type test tube piece, and the extrados of the test tube piece is loaded with acting force by the jacks, so that multi-working-condition simulation can be realized.
The assembly method has the beneficial effects that:
the centroid and the length of the suspension cable of each pipe piece block are accurately calculated, so that the convenience in mounting and assembling the pipe piece blocks can be ensured, the assembling posture is kept in the whole process of assembling the pipe piece blocks, and the assembling accuracy of the pipe piece blocks is improved;
the jack is arranged on the outer arc surface of the segment block for supporting, the support structure is arranged on the inner arc surface of the segment block, the adjustable support piece is arranged on the support structure, and the movable adjustability of the jack and the adjustable support piece can meet the positioning requirement of the segment block structure and ensure that the structure is not unstable;
by arranging the target points on each pipe piece block, the assembling positions of the pipe piece blocks can be accurately positioned and adjusted through the target points, so that the assembling of the pipe piece blocks has higher assembling precision, and the target points can be positioned through a measuring instrument;
the supporting structure can be assembled and disassembled, so that the utilization rate is high, and the test cost is reduced;
the assembling method is safe and reliable, has high assembling efficiency, and provides powerful technical support for the mechanical loading experiment of the standing shield segment.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (9)
1. A method for assembling shield segments for a standing type prototype structure test is characterized by comprising the following steps:
installing a lower loading device;
hoisting each pipe piece block in the test pipe piece, which is correspondingly positioned in the lower loading device, into the lower loading device, adjusting the position of each hoisted pipe piece block and completing the connection among the hoisted pipe piece blocks;
mounting a support structure on the connected pipe piece block in the lower loading device;
hoisting the rest segment blocks to be assembled in the test segment to the support structure and the connected segment blocks, adjusting the position of the segment blocks to be assembled and completing the connection; and
installing an upper loading device on the lower loading device and removing the supporting structure, thereby completing the standing assembly of the test segments;
still include the step of setting up hoist cable length before hoisting the section of jurisdiction piece:
acquiring the hanging hole position and the centroid coordinate of each pipe piece block;
and calculating the lengths of the suspension cables corresponding to the pipe pieces according to the obtained suspension hole positions and the centroid coordinates, so that the hoisting postures of the pipe pieces can be consistent with the set assembling postures of the pipe pieces when the pipe pieces are hoisted according to the lengths of the suspension cables.
2. The method for assembling shield segments for the standing prototype structure test according to claim 1, wherein when all the segments are hoisted, hoisting is performed according to the lengths of the hoisting cables corresponding to the segments.
3. The method for assembling the shield segments for the standing prototype structure test according to claim 1, wherein the step of hoisting each segment block of the test segment, which corresponds to the segment block in the lower loading device, into the lower loading device comprises:
positioning the position of the tube piece block at the bottom in the lower loading device, and hoisting the tube piece block at the bottom to the positioned position;
and alternately hoisting the tube piece blocks positioned on the two sides of the tube piece block positioned at the bottom and keeping the hoisting state.
4. The assembling method of the shield segments for the standing prototype structure test according to claim 1 or 3, wherein the step of adjusting the positions of the segments to be hoisted and completing the connection between the segments to be hoisted comprises:
hoisting the segment block at the bottom and positioning and placing the segment block in the lower loading device;
hoisting the rest segment blocks into the lower loading device, and keeping the hoisting state;
under the condition of keeping a hoisting state, preliminarily connecting circumferential bolts among the segment blocks in the lower loading device;
and adjusting the position of the corresponding segment block in the lower loading device to a set position by using a jack in the lower loading device, and adding the pre-tightening force of the circumferential bolt between the segment blocks in the lower loading device to a set value to complete the connection between the segment blocks in the lower loading device.
5. The method for assembling shield segments for a standing prototype structure test according to claim 4, wherein the step of adjusting the position of the corresponding segment block in the lower loading device to a set position by using a jack in the lower loading device comprises:
setting two target points on each pipe piece block;
after the lower loading device is installed, positioning new coordinates of the target point on each segment block in the lower loading device;
and adjusting the telescopic amount of the jack according to the new coordinates of the target point so that the target point on the corresponding segment block is correspondingly positioned at the new coordinates of the target point, thereby completing the position adjustment of the segment block.
6. The method of assembling trial shield segments according to claim 1, wherein the step of installing the support structure includes:
assembling a support structure main body, and arranging corresponding triangular support frames on the support structure main body corresponding to two end parts of each pipe piece block;
the triangular support frame is provided with an adjustable support piece which can move and adjust along the direction vertical to the inner cambered surface of the corresponding pipe piece;
and arranging a temporary supporting structure for supporting and connecting the supporting structure at the outer side of the lower loading device.
7. The method of assembling shield segments for a standing prototype structural test according to claim 6, wherein the step of adjusting the position of the segment blocks to be assembled comprises:
the adjustable supporting pieces are adjusted towards the direction close to or far away from the intrados of the corresponding pipe piece block, so that the position of the pipe piece block to be assembled is adjusted in place.
8. The method for assembling shield segments for a standing prototype structure test according to claim 1, wherein the step of hoisting the remaining segments to be assembled in the test segments to the support structure and the connected segments comprises:
alternately hoisting the segment blocks correspondingly connected with the segment blocks in the lower loading device, and keeping a hoisting state;
and hoisting the segment block positioned at the top and keeping the hoisting state.
9. The method for assembling shield segments for a standing prototype structure test according to claim 8, further comprising:
under the condition of keeping the hoisting state, preliminarily connecting the hoisted segment blocks to be assembled with the corresponding hoop bolts among the segment blocks in the lower loading device;
and under the condition of keeping the hoisting state, preliminarily connecting the segment block positioned at the top with the corresponding circumferential bolts among the segment blocks.
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| CN112302683B (en) * | 2020-10-26 | 2021-04-30 | 昆山市建设工程质量检测中心 | Model manufacturing method for simulating shield segment wall post-grouting defect |
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| KR20130081932A (en) * | 2012-01-10 | 2013-07-18 | 아이에스동서 주식회사 | Fastening device for segments |
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