CN113279781A - Prefabricated subway shield segment and detection and installation method thereof - Google Patents
Prefabricated subway shield segment and detection and installation method thereof Download PDFInfo
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- CN113279781A CN113279781A CN202110743386.5A CN202110743386A CN113279781A CN 113279781 A CN113279781 A CN 113279781A CN 202110743386 A CN202110743386 A CN 202110743386A CN 113279781 A CN113279781 A CN 113279781A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009434 installation Methods 0.000 title abstract description 10
- 238000001514 detection method Methods 0.000 title abstract description 7
- 239000010426 asphalt Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000003469 silicate cement Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 abstract description 8
- 238000007569 slipcasting Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000011900 installation process Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
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- 229920002635 polyurethane Polymers 0.000 description 2
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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
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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
- E21D11/083—Methods or devices for joining adjacent concrete segments
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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
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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Abstract
The invention provides a prefabricated subway shield segment and a detection and installation method thereof, and belongs to the technical field of subway shield segments and installation methods thereof. The problem of traditional shield segment site operation pollution big, shield segment grouting speed is slow, the gap filling effect is poor is solved in order to solve. The shield constructs section of jurisdiction both ends for the first stair structure and the second stair structure that match each other, and the intrados sets up first injected hole, and the extrados sets up at least three second injected hole, and first injected hole and second injected hole form the intercommunication pipeline in the shield constructs the inside of section of jurisdiction, and shield constructs section of jurisdiction both sides and intrados and all are provided with the bolt hole, and first stair structure all is provided with the bolt hole with second stair structure terminal surface. The shield segments are spliced in staggered joints after being prefabricated in a factory, primary grouting treatment is carried out, a three-dimensional laser scanner is adopted for scanning, and SBS modified asphalt is used for sealing joints. The inside slip casting pore that sets up of shield section of jurisdiction, slip casting is fast, utilizes three-dimensional laser scanner to detect and joint filling, effectively improves waterproof nature.
Description
Technical Field
The invention relates to the technical field of subway shield segments and installation methods thereof, in particular to a prefabricated subway shield segment and a detection and installation method thereof.
Background
With the continuous development of urban construction scale, the development of underground and urban underground spaces and the reconstruction of urban water supply and drainage systems of various domestic big cities are started in succession, wherein the shield construction technology is a construction method widely used for underground tunnel construction, and the installation of an internal equipment pipeline of a shield tunnel is an important construction link for realizing the function of the shield tunnel.
The shield segment is a main assembly component for shield construction, is the innermost barrier of the tunnel and plays a role in resisting soil layer pressure, underground water pressure and some special loads. The shield segment is a permanent lining structure of a shield tunnel, and the quality of the shield segment is directly related to the overall quality and safety of the tunnel, so that the waterproof performance and the durability of the tunnel are influenced.
The traditional shield segment manufacturing adopts a cast-in-place method, so that the environment is greatly polluted, the construction difficulty is high, the shield segment is easy to be installed, the structure is not tight and compact, pores are reserved between adjacent shield segments, the water seepage risk is caused, and the waterproof performance is poor; the quality of the shield segments is not accurately detected, if the shield segments have hollow parts and holes, the stress of the shield segments is poor, and the shield segments are easy to damage due to extrusion force during splicing; an accurate detection instrument for a splicing gap is not arranged in the installation process, and if larger gaps exist in the circular gap and the longitudinal gap, the waterproof effect of the whole shield tunnel is poor; traditional shield constructs section of jurisdiction and is the solid lamellar structure, and the thick liquid speed of filling is slower during secondary slip casting, influences construction speed, and the slip casting effect is relatively poor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
the problem of traditional shield segment site operation bring environmental pollution and noise pollution, shield segment quality is uneven, and it is not compact to easily appear the concatenation, and waterproof nature is relatively poor, and the grout speed is relatively slow, and is relatively poor to the hole filling effect of circumferential weld and longitudinal joint in the installation is solved.
The invention adopts the technical scheme for solving the technical problems that:
the invention provides a prefabricated subway shield segment, which is an arc-shaped sheet body, wherein one end of the shield segment is of a first step structure, the other end of the shield segment is of a second step structure matched with the first step structure, the first step structure for the shield segment is connected with the second step structure of an adjacent shield segment, a first grouting hole is formed in the inner arc surface of the shield segment, at least three second grouting holes are formed in the outer arc surface of the shield segment, the first grouting hole and the second grouting holes form a communicated pipeline in the shield segment, and are used for enabling slurry to rapidly fill a gap between the shield segment and a soil body during secondary grouting treatment, bolt holes are formed in both sides of the shield segment and the inner arc surface, and bolt holes are formed in the end surface of the joint of the first step structure and the second step structure.
Optionally, the radian threshold value of the shield segment is pi/8-pi/5.
Optionally, the arc length of the connecting portion of the first step structure and the second step structure is 1/3-1/2 of the arc length of the extrados of the shield segment.
Optionally, shield constructs section of jurisdiction both sides and is provided with two at least bolt holes, shield constructs section of jurisdiction inner arc and is the six at least bolt holes of circular arrangement, first stair structure and second stair structure junction terminal surface are provided with two at least bolt holes.
Optionally, the shield segments are high impervious shield segments.
A method for detecting and installing prefabricated subway shield segments comprises a plurality of prefabricated subway shield segments and comprises the following steps:
firstly, prefabricating shield segments by adopting a waterproof concrete mixture of high-impermeability shield segments in a factory, arranging bolt holes in an inner arc surface, two sides, a first stepped structure end surface and a second stepped structure end surface according to the size of the shield segments, detecting the quality of the shield segments by using a three-dimensional laser scanner, judging whether potholes exist on the surfaces of the shield segments and whether holes exist in the shield segments or not according to three-dimensional imaging, screening out the shield segments containing potholes and holes, and using the shield segments without or containing less than 3 potholes and holes for later use;
step two, assembling and primary grouting treatment are carried out on the screened shield segment at the same time, staggered joint assembling from the bottom to the top and then from the bottom is carried out on the adjacent shield segments through a first stepped structure and a second stepped structure, a group of annular shield segment structures are assembled through bolts, two groups of adjacent shield segment structures are assembled into a complete shield segment structure through bolts, and primary grouting treatment is carried out on the ultrafine silicate cement slurry with the specific surface area of 600 + 700 square meters/kg and the average particle size of 8-10 mu m along the annular joint or longitudinal joint of the adjacent two shield segments by using a high-pressure grouting machine;
and step three, after assembling and primary grouting are completed, measuring the holes between the shield segments through a three-dimensional laser scanner, measuring the holes between the shield segments through three-dimensional imaging, sealing the holes between the shield segments through SBS modified asphalt, and performing secondary grouting treatment on the shield segments and the soil body holes through the first grouting holes and the second grouting holes when surface subsidence occurs in the construction process.
Optionally, the superfine silicate cement slurry in the second step is prepared by mixing superfine silicate clinker and water according to the mass ratio of 1.2-1.5: 1, and uniformly mixing and stirring the mixture to obtain the product.
Optionally, in the second step, when the pressure reaches 0.25Mpa during primary grouting, stopping grouting and waiting for 2.5-3h for solidification, thereby completing primary grouting.
Compared with the prior art, the invention has the beneficial effects that:
according to the prefabricated subway shield segment, the shield segment is prefabricated by adopting the waterproof concrete mixture of the high-impermeability shield segment in a factory, so that the environmental pollution and the noise pollution caused by the cast-in-place shield segment are avoided, the on-site construction difficulty and the danger coefficient are reduced, the first step structure and the second step structure which are matched with each other are arranged at the two ends of the shield segment and can be spliced in a staggered joint splicing mode, the tunnel has better integrity after the adopted step structures are spliced, the ring surface is smoother, the ring-shaped bolts are easy to fix, and the problem of water seepage of the seams of the traditional shield segment is solved to a certain extent;
according to the detection and installation method of the prefabricated subway shield segment, a three-dimensional laser scanner is used for three-dimensionally scanning the finished shield segment in the process of prefabricating the shield segment in a factory, whether pits exist on the surface of the shield segment or not and whether holes exist inside the shield segment or not are detected, unqualified shield segments are screened out, damage caused by the stress of the shield segment in the installation process is avoided, and the overall stability and the water resistance are improved; scanning the spliced shield segment by a three-dimensional laser scanner in the installation process, detecting whether longitudinal joints and circular joints are large, and performing joint filling on the parts needing joint filling by SBS modified asphalt according to an imaging result, so that the fatigue resistance of the joint of the segment and the segment is improved, the waterproof property of the joint is better, and the waterproof property of the whole shield structure is further improved;
through carrying out the secondary slip casting to the passageway that forms between inside first injected hole of shield segment and the second injected hole, can fill shield segment and soil body hole department fast, effectively deal with the earth's surface and subside the phenomenon, realized the high-efficient construction of shield segment, better assurance the quality and the security of construction.
Drawings
Fig. 1 is a schematic view of a three-dimensional structure of a prefabricated subway shield segment according to the present invention;
FIG. 2 is a schematic perspective view of a prefabricated subway shield segment according to the present invention;
FIG. 3 is a front view of an entirety of a prefabricated subway shield segment according to the present invention;
fig. 4 is a schematic view of the overall three-dimensional structure of the prefabricated subway shield segment.
Description of reference numerals:
1-extrados surface, 2-intrados surface, 3-first grouting hole, 4-bolt hole, 5-first step structure, 6-second step structure, 7-second grouting hole.
Detailed Description
In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", "left", "right", and the like in the embodiments indicate terms of orientation, and are used only for simplifying the positional relationship based on the drawings of the specification, and do not represent that the elements, devices, and the like indicated in the description must operate according to the specific orientation and the defined operation, method, and configuration, and such terms are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" mentioned in the embodiments of the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The first specific embodiment is as follows: referring to fig. 1 to 4, the present invention provides a prefabricated subway shield segment, which is an arc-shaped segment, one end of the shield segment is provided with a first step structure 5, the other end of the shield segment is provided with a second step structure 6 matched with the first step structure 5, the first step structure 5 for the shield segment is connected to the second step structure 6 of an adjacent shield segment, the inner arc surface 2 of the shield segment is provided with a first grouting hole 3, the outer arc surface 1 of the shield segment is provided with at least three second grouting holes 7, the first grouting hole 3 and the second grouting holes 7 form a communicating pipeline in the shield segment, when the grouting material is used for secondary grouting treatment, slurry is rapidly filled in gaps between shield segments and soil bodies, bolt holes 4 are arranged on both sides of each shield segment and on the inner cambered surfaces 2, the end face of the joint of the first step structure 5 and the second step structure 6 is provided with a bolt hole 4.
The shield constructs section of jurisdiction both ends and is provided with the first stair structure 5 and the second stair structure 6 that match each other, and the mode of accessible staggered joint concatenation is assembled, can improve the wholeness in tunnel after stepped structure assembles, and the anchor ring is comparatively level and smooth, and the hoop bolt is fixed easily, has solved traditional shield and has constructed section of jurisdiction seam infiltration problem to a certain extent.
The second specific embodiment: with reference to fig. 1 to 4, the radian threshold of the shield segment is pi/8-pi/5, that is, a 10-16 ring shield segment structure is adopted to perform staggered joint annular splicing, and corresponding adjustment can be performed according to the construction environment. Other combinations and connections of this embodiment are the same as those of the first embodiment.
The third concrete implementation scheme is as follows: as shown in fig. 1 to 4, the arc length of the connecting portion of the first step structure 5 and the second step structure 6 is 1/3-1/2 of the arc length of the extrados surface 1 of the shield segment. The arc length of the connecting part of the first step structure 5 and the second step structure 6 can ensure the stability of the connecting part, and the positioning bolt can be conveniently installed. Other combinations and connections of this embodiment are the same as those of the first embodiment.
The fourth specific embodiment: combine fig. 1 to 4 to show, shield structure section of jurisdiction both sides are provided with two at least bolt holes 4, shield structure section of jurisdiction intrados 2 is six at least bolt holes 4 of circular arrangement, first stair structure 5 and 6 junction terminal surfaces of second stair structure are provided with two at least bolt holes 4. The shield segment is longitudinally spliced through the two sides of the shield segment and the bolt holes 4 in the inner arc surface 2, and the bolt holes 4 in the end surfaces of the first stepped structure 5 and the second stepped structure 6 are spliced annularly through positioning bolts. Other combinations and connections of this embodiment are the same as those of the first embodiment.
The fifth concrete embodiment: with reference to fig. 1 to 4, the number of the second grouting holes 7 is four, the second grouting holes 7 are uniformly distributed on the outer arc surface 1 and are communicated with the first grouting holes 3, and the formed grouting hole channel can improve the secondary pouring speed. Other combinations and connections of this embodiment are the same as those of the fourth embodiment.
The sixth specific embodiment: as shown in fig. 1 to 4, the arc length of the intrados surface 2 is the same as that of the extrados surface 1. Other combinations and connections of this embodiment are the same as those of the fifth embodiment.
The seventh specific embodiment: with reference to fig. 1 to 4, the thickness of the first step structure 5 is 1/3-1/2 of the thickness of the shield segment, and the thickness of the second step structure 6 is 1/2-2/3 of the thickness of the shield segment. Other combinations and connections of this embodiment are the same as those of the fifth embodiment.
The specific embodiment eight: referring to fig. 1 to 4, the shield segment is a high-impermeability shield segment. The waterproof performance of the whole shield segment structure is improved. Other combinations and connections of this embodiment are the same as those of the fifth embodiment.
The specific embodiment is nine: as shown in fig. 1 to 4, the surfaces of the intrados 2 and the extrados 1 are coated with polyurethane waterproof coatings. The waterproof performance of the whole shield pipeline is improved, and the service life of the whole shield pipeline is prolonged. Other combinations and connections of this embodiment are the same as those of embodiment eight.
The specific embodiment ten: as shown in FIG. 1 to FIG. 4, the thickness of the polyurethane waterproof coating is 130-150 μm. Other combinations and connections of this embodiment are the same as those of the ninth embodiment.
The specific embodiment eleven: a detection and installation method for a prefabricated subway shield segment comprises the following steps:
firstly, prefabricating shield segments by adopting a waterproof concrete mixture of high-impermeability shield segments in a factory, arranging bolt holes 4 on an inner arc surface 2, two sides, an end surface of a first stepped structure 5 and an end surface of a second stepped structure 6 according to the size of the shield segments, detecting the quality of the shield segments by using a three-dimensional laser scanner, judging whether hollow cavities exist on the surfaces of the shield segments and whether holes exist in the shield segments according to three-dimensional imaging, screening out the shield segments containing the hollow cavities and the holes, and using the shield segments without or with less hollow cavities and holes for standby;
step two, assembling and primary grouting treatment are carried out on the screened shield segment at the same time, joint staggering assembling from the bottom to the top and then to the bottom is carried out on the adjacent shield segments through a first stepped structure 5 and a second stepped structure 6, a group of annular shield segment structures are assembled through bolts, two groups of adjacent shield segment structures are assembled into a complete shield segment structure through bolts, and primary grouting treatment is carried out on superfine silicate cement slurry with the specific surface area of 600 + 700 square meters per kilogram and the average particle diameter of 8-10 mu m along the annular joint or longitudinal joint of the two adjacent shield segments by using a high-pressure grouting machine;
and step three, after assembling and primary grouting are completed, measuring the holes between the shield segments through a three-dimensional laser scanner, measuring the holes between the shield segments through three-dimensional imaging, sealing the holes between the shield segments through SBS modified asphalt, and performing secondary grouting treatment on the shield segments and the soil body holes through the first grouting holes 3 and the second grouting holes 7 when surface subsidence occurs in the construction process.
The method comprises the following steps of performing three-dimensional scanning on finished shield segments by using a three-dimensional laser scanner in the process of prefabricating the shield segments in a factory, detecting whether pits exist on the surfaces of the shield segments or not, and whether holes exist inside the shield segments or not, screening out unqualified shield segments, avoiding damage in the installation process caused by the influence on the stress of the shield segments, and improving the overall stability and the waterproofness; scanning the spliced shield segment by a three-dimensional laser scanner in the installation process, detecting whether longitudinal joints and circular joints are large, and performing joint filling on the parts needing joint filling by SBS modified asphalt according to an imaging result, so that the fatigue resistance of the joint of the segment and the segment is improved, the waterproof property of the joint is better, and the waterproof property of the whole shield structure is improved again;
through carrying out the secondary slip casting to the passageway that forms between inside first injected hole 3 of shield segment and the second injected hole 7, can fill shield segment and soil body hole department fast, effectively deal with the earth's surface and subside the phenomenon, realized the high-efficient construction of shield segment, better assurance the quality and the security of construction.
The specific embodiment twelve: the superfine silicate cement slurry in the step two is prepared by mixing superfine silicate clinker and water according to the mass ratio of 1.2-1.5: 1, and uniformly mixing and stirring the mixture to obtain the product. The superfine portland cement grout belongs to a high-performance superfine cement-based grouting material, has good permeability and groutability similar to those of organic chemical grouting liquid, has higher strength and durability, has environmental protection property, has no pollution to the surrounding environment, and can improve the whole waterproofness by pouring the superfine portland cement grout into shield segments. Other combinations and connections of this embodiment are the same as in embodiment eleven.
The specific embodiment thirteen: and in the second step, when the pressure reaches 0.25Mpa during primary grouting, stopping grouting and waiting for 2.5-3h for solidification, thus finishing primary grouting. Other combinations and connections of this embodiment are the same as in embodiment eleven.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (8)
1. The utility model provides a prefabricated subway shield constructs section of jurisdiction which characterized in that: the shield segment is an arc-shaped sheet body, one end of the shield segment is a first step structure (5), the other end of the shield segment is provided with a second step structure (6) matched with the first step structure (5), the first step structure (5) used for the shield segment is connected with the second step structure (6) of the adjacent shield segment, the inner arc surface (2) of the shield segment is provided with a first grouting hole (3), the outer arc surface (1) of the shield segment is provided with at least three second grouting holes (7), the first grouting holes (3) and the second grouting holes (7) form a communicating pipeline in the shield segment, when the grouting device is used for secondary grouting treatment, slurry is rapidly filled in gaps between shield segments and soil bodies, bolt holes (4) are arranged on both sides of the shield segments and on the inner cambered surfaces (2), the end face of the joint of the first stepped structure (5) and the second stepped structure (6) is provided with a bolt hole (4).
2. The prefabricated subway shield segment as claimed in claim 1, wherein: the radian threshold value of the shield segment is pi/8-pi/5.
3. The prefabricated subway shield segment as claimed in claim 1, wherein: the arc length of the connecting part of the first step structure (5) and the second step structure (6) accounts for 1/3-1/2 of the arc length of the outer arc surface (1) of the shield segment.
4. The prefabricated subway shield segment as claimed in claim 1, wherein: the shield constructs section of jurisdiction both sides and is provided with two at least bolt holes (4), shield constructs section of jurisdiction intrados (2) and is six at least bolt holes (4) of circular arrangement, first stair structure (5) and second stair structure (6) junction terminal surface all are provided with two at least bolt holes (4).
5. The prefabricated subway shield segment as claimed in claim 1, wherein: the shield segment is a high impervious shield segment.
6. A method for detecting and installing prefabricated subway shield segments, which comprises a plurality of novel prefabricated subway shield segments as claimed in any one of claims 1-5, and is characterized by comprising the following steps:
the method comprises the steps that firstly, a shield segment is prefabricated by adopting waterproof concrete mixture of a high-impermeability shield segment, bolt holes (4) are formed in an inner arc surface (2), two sides, the end surface of a first stepped structure (5) and the end surface of a second stepped structure (6) according to the size of the shield segment, the quality of the shield segment is detected by the prefabricated shield segment through a three-dimensional laser scanner, whether pits exist on the surface of the shield segment or not and whether holes exist in the shield segment or not are judged according to three-dimensional imaging, the shield segment containing the pits and the holes is screened out, and the shield segment without or with fewer pits and holes is reserved;
step two, assembling and primary grouting treatment are carried out on the screened shield segment at the same time, staggered joint assembling from bottom to top and then from bottom is carried out on the adjacent shield segments through a first stepped structure (5) and a second stepped structure (6), a group of annular shield segment structures are assembled through bolts, two groups of adjacent shield segment structures are assembled into a complete shield segment structure through bolts, and primary grouting treatment is carried out on superfine silicate cement grout with the specific surface area of 600 + 700 square meters per kilogram and the average grain diameter of 8-10 mu m along the annular joint and the longitudinal joint of the adjacent two shield segments through a high-pressure grouting machine;
and step three, after assembling and primary grouting are completed, measuring the holes between the shield segments through a three-dimensional laser scanner, measuring the holes between the shield segments through three-dimensional imaging, sealing the holes between the shield segments by adopting SBS modified asphalt, and performing secondary grouting treatment on the shield segments and the soil body holes through the first grouting holes (3) and the second grouting holes (7) when surface settlement occurs in the construction process.
7. The method for detecting and installing the prefabricated subway shield segment as claimed in claim 6, wherein: the superfine silicate cement slurry in the step two is prepared by mixing superfine silicate clinker and water according to the mass ratio of 1.2-1.5: 1, and uniformly mixing and stirring the mixture to obtain the product.
8. The method for detecting and installing the prefabricated subway shield segment as claimed in claim 6, wherein: and in the second step, when the pressure reaches 0.25Mpa during primary grouting, stopping grouting and waiting for 2.5-3h for solidification, thus finishing primary grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110743386.5A CN113279781A (en) | 2021-06-30 | 2021-06-30 | Prefabricated subway shield segment and detection and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370828A (en) * | 2021-12-28 | 2022-04-19 | 中国铁路设计集团有限公司 | Shield tunnel diameter convergence and radial slab staggering detection method based on laser scanning |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370828A (en) * | 2021-12-28 | 2022-04-19 | 中国铁路设计集团有限公司 | Shield tunnel diameter convergence and radial slab staggering detection method based on laser scanning |
| CN114370828B (en) * | 2021-12-28 | 2023-06-20 | 中国铁路设计集团有限公司 | Shield tunnel diameter convergence and radial dislocation detection method based on laser scanning |
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