CN116117991A - Mould for manufacturing shield tunnel scale model - Google Patents
Mould for manufacturing shield tunnel scale model Download PDFInfo
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- CN116117991A CN116117991A CN202310236567.8A CN202310236567A CN116117991A CN 116117991 A CN116117991 A CN 116117991A CN 202310236567 A CN202310236567 A CN 202310236567A CN 116117991 A CN116117991 A CN 116117991A
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- mould
- mold
- shield tunnel
- manufacturing
- bulge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/82—Moulds built-up from several parts; Multiple moulds; Moulds with adjustable parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/86—Cores
- B28B21/88—Cores adjustable, collapsible or expansible
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a mould for manufacturing a shield tunnel scale model, which is characterized in that wedge-shaped bulges are arranged at longitudinal joints and circumferential joints of the mould so as to reduce the effective cross section of a poured segment structure model at the longitudinal joints and the circumferential joints, wherein an outer mould is made of a rigid material, an inner mould is made of a flexible material, an inner mould and an outer mould are spliced by adopting four quarter-ring moulds, and after concrete pouring is finished, the four quarter-rings can be detached respectively, so that the mould is easy to release. Compared with the prior art, the invention can simulate the weakening of the structural strength of the splicing position of the longitudinal seam and the circumferential seam of the segment in the real tunnel environment by utilizing the wedge-shaped bulge under the condition of full-ring casting, and does not need to separately cast the segment and splice the segment. The invention comprehensively considers the weakening of the strength of the longitudinal seam and the circular seam of the actual tunnel model and the convenience of disassembling the mold after pouring, has the characteristics of convenient use and high reduction degree, and can create good economic benefit and scientific research value.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to a mould for manufacturing a shield tunnel scale model.
Background
In recent years, with the continuous promotion of the urban process, the population of large and medium cities is suddenly increased, and the traffic pressure becomes a difficult problem facing the cities. In this context, the use of underground space has become an important point in urban planning construction. The subway shield tunnel has the advantages of high construction speed, labor saving, small influence on the ground surface and the like, and gradually becomes the main stream of urban underground traffic construction. However, the urban underground environment has quite large uncertainty, and challenges are brought to shield tunnel construction and structural design, so that a shield tunnel structure model test needs to be completed before shield construction is carried out in many times to explore the feasibility of a specific construction method or the safety of a shield tunnel structure.
The shield tunnel structure model test relies on the manufacture of segment models. Because most of the existing shield tunnel segments are made of reinforced concrete, a mould is required to be prefabricated for concrete pouring. However, because the shield tunnel needs to be spliced by duct pieces, a spliced longitudinal seam and a circular seam are left after the splicing, and the structural strength of the seam is weakened to a certain extent; in addition, after the concrete pouring is finished, the mould of the annular duct piece is often difficult to take out due to the adhesion of the concrete and the mould, so that the demoulding is difficult; in particular, when the whole ring is poured, the internal mold is wrapped by concrete, and the disassembly is extremely difficult. The method has the advantages that the method can be used for pouring the duct pieces one by one, but is time-consuming and labor-consuming, the model is easy to damage, the requirements of a construction party on test convenience and rapidness cannot be well met, and the method is difficult to adapt to the rapid construction rhythm of urban subways.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mould for manufacturing a shield tunnel scale model.
The aim of the invention can be achieved by the following technical scheme:
a mould for manufacturing a shield tunnel scale model comprises an outer mould and an inner mould, wherein the inner mould is nested in the outer mould, and the outer mould and the inner mould are two concentric rings;
the inner surface of the circular ring of the outer die is provided with an outer die annular seam and an inner protrusion of the outer die;
the outer surface of the circular ring of the inner mold is provided with an inner mold outer bulge.
Furthermore, the inner bulges of the outer die and the outer bulges of the inner die are wedge-shaped bulges, so that the quick demoulding after pouring and forming is facilitated.
Further, the outer mold is an outer mold made of a rigid material.
Further, the internal mold is an internal mold made of flexible materials.
Further, the outer bulge of the inner die is a wooden rib, and the wooden rib is fixed on the outer surface of the circular ring of the inner die.
Further, the inner die is supported, positioned and nested in the outer die through the wood plate.
Further, the outer die circumferential seam and the outer die inner bulge are welded on the inner surface of the circular ring of the outer die.
Further, the outer die and the inner die are respectively divided into four annular sheets along the radial direction, and the four annular sheets are spliced to form a whole ring.
Further, the external mold circumferential seam and the internal protrusion of the external mold are used for simulating positive bending moment;
the outer bulge of the inner die is used for simulating a hogging moment.
Further, the protrusion heights of the inner protrusions of the outer die and the outer protrusions of the inner die are determined by bending rigidity reduction coefficients of longitudinal joints relative to the duct pieces, and the protrusion heights are set according to the bending rigidity reduction coefficients, so that the rigidity is equivalent;
the theoretical calculation formula is:
wherein EI represents the bending rigidity of the segment, EI Splicing joint Represents the bending rigidity of joints, E is the elastic modulus of the duct piece material, I is the section moment of inertia, H is the duct piece thickness, b is the ring width of the duct piece, H is the thickness of the duct piece at the joint, and lambda is the bending rigidity reduction coefficient.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the bulge simulation hogging moment is arranged on the inner die, the bulge simulation positive bending moment is arranged on the outer film, and the effective section of the poured segment structural model at the longitudinal joint and the circumferential joint can be reduced under the condition of full-ring pouring, so that the weakening of the structural strength of the joint of the longitudinal joint and the circumferential joint of the segment in a real tunnel environment can be well simulated.
2. The mold provided by the invention is used for manufacturing a model, and a whole ring casting mode is adopted, so that the multi-ring tunnel duct pieces can be directly and simultaneously cast, the duct piece manufacturing time is saved, and the duct pieces do not need to be cast separately and spliced.
3. According to the invention, the inner die and the outer die are respectively divided into four annular sheets along the radial direction, and the four annular sheets are spliced to form a whole ring, so that the die can be easily disassembled after pouring is finished, and the outer die can be directly taken down along the radial direction of the duct piece without being slowly pulled out along the axial direction.
4. The outer die is made of rigid materials, can be recycled, and can be directly pulled out in the radial direction during disassembly without being pulled out in the axial direction. The internal mold is made of flexible materials, so that the internal mold is convenient to manufacture, and the flexible materials are easy to tear, so that the internal mold can be quickly disassembled, and the demolding time is saved.
Drawings
FIG. 1 is a schematic diagram of an outer mold structure of the present invention;
FIG. 2 is a schematic diagram of an inner mold structure according to the present invention;
fig. 3 is a schematic view of a cast shield tunnel segment.
Reference numerals: the inner die comprises a 1-outer die, a 2-outer die circumferential seam, a 3-outer die inner bulge, a 4-inner die outer bulge, a 5-inner die, a 6-segment inner longitudinal seam, a 7-segment outer longitudinal seam and an 8-segment circumferential seam.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Aiming at the problems existing in the manufacture of shield tunnel models and the defects of block pouring in the prior art, the invention provides a mold for manufacturing a shield tunnel scale model, and the mold wedge-shaped bulge is arranged on the premise of whole ring pouring, so that the segment model is provided with grooves to simulate the characteristic of weakening of section strength; the grooves simulating the longitudinal joints are divided into inner grooves and outer grooves, the longitudinal joints bearing positive bending moment are provided with the inner grooves, and the longitudinal joints bearing negative bending moment are provided with the outer grooves; meanwhile, the whole ring is formed by splicing 4 1/4 ring dies, the outer die is made of rigid materials, the inner die is made of flexible materials, and the die is convenient to disassemble after pouring is finished.
Specifically, as shown in fig. 1-3, the mold comprises an outer mold 1 and an inner mold 2, wherein the inner mold 2 is nested in the outer mold 1, and the outer mold 1 and the inner mold 2 are two concentric rings;
the inner surface of the circular ring of the outer mold 1 is provided with an outer mold circumferential seam 2 and an outer mold inner bulge 3; the outer surface of the circular ring of the inner mold 2 is provided with an inner mold outer bulge 4 for reducing the effective cross-sectional area of the joint.
In the embodiment, the inner bulge 3 of the outer mold and the outer bulge 4 of the inner mold are wedge-shaped bulges, so that the model can be conveniently removed after the model is manufactured.
The outer die 1 and the inner die 2 are respectively divided into four annular sheets along the radial direction, and the four annular sheets are spliced to form a whole ring. The outer die circumferential seam 2 and the outer die inner bulge 3 are welded on the inner surface of the circular ring of the outer die 1. The outer bulge 4 of the inner mold is a wooden rib which is fixed on the outer surface of the circular ring of the inner mold 2.
The outer mold 1 is an outer mold made of a rigid material, and the inner mold 2 is an inner mold made of a flexible material. In the embodiment, the outer mold 1 is made of a steel plate, the outer mold can be recycled, and the outer mold can be directly pulled out along the radial direction during the disassembly without being pulled out along the axial direction. The internal mold 2 is made of flexible PVC sheets, so that the manufacturing is convenient, and meanwhile, the PVC sheets are high in flexibility and easy to tear, so that the internal mold can be quickly disassembled, and the demolding time is saved.
In the embodiment, the inner die 2 is positioned and nested in the outer die 1 through a wood board.
Compared with the prior art, the mould for manufacturing the shield tunnel scale model can better simulate the weakening of the structural strength of the splicing position of the longitudinal joint and the circumferential joint of the segment in the real tunnel environment under the condition of full-ring casting. The position of a longitudinal seam bearing positive and negative bending moments is found through structural calculation, a bulge is arranged on the inner die 2 to simulate the negative bending moment, and a bulge is arranged on the outer film 1 to simulate the positive bending moment. And further, calculating a bending rigidity reduction coefficient of the longitudinal joint relative to the duct piece by theory, and setting the depth of the groove according to the coefficient to make the rigidity equivalent.
The theoretical calculation formula is:
wherein EI represents the bending rigidity of the segment, EI Splicing joint Represents the bending rigidity of joints, E is the elastic modulus of the duct piece material, I is the section moment of inertia, H is the duct piece thickness, b is the ring width of the duct piece, H is the thickness of the duct piece at the joint, and lambda is the bending rigidity reduction coefficient.
The bulge design enables the poured tunnel duct piece to have circumferential seams, and can directly and simultaneously pour the multi-ring tunnel duct piece, so that duct piece manufacturing time is saved, and duct pieces do not need to be poured separately and spliced; the invention can also smoothly realize the disassembly of the die after pouring, and can directly take down the die along the radial direction of the duct piece without slowly withdrawing along the axial direction.
The invention comprehensively considers the weakening of the strength of the longitudinal seam and the circular seam of the actual tunnel model and the convenience of disassembling the mold after pouring, has the characteristics of convenient use and high reduction degree, and can create good economic benefit and scientific research value.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The mould for manufacturing the shield tunnel scale model is characterized by comprising an outer mould (1) and an inner mould (2), wherein the inner mould (2) is nested in the outer mould (1), and the outer mould (1) and the inner mould (2) are two concentric rings;
the inner surface of the circular ring of the outer mold (1) is provided with an outer mold circumferential seam (2) and an outer mold inner bulge (3);
an inner mold outer bulge (4) is arranged on the outer surface of the circular ring of the inner mold (2).
2. The mould for manufacturing the shield tunnel scale model according to claim 1, wherein the outer mould inner bulge (3) and the inner mould outer bulge (4) are wedge-shaped bulges.
3. A mould for making a scaled mould for a shield tunnel according to claim 1, characterized in that the outer mould (1) is an outer mould made of a rigid material.
4. A mould for making a scaled model of a shield tunnel according to claim 1, characterized in that the inner mould (2) is an inner mould made of flexible material.
5. The mould for manufacturing a shield tunnel scale model according to claim 1, wherein the inner mould outer bulge (4) is a wooden rib which is fixed on the outer surface of the circular ring of the inner mould (2).
6. A mould for manufacturing a shield tunnel scale model according to claim 1, characterized in that the inner mould (2) is nested in the outer mould (1) by means of plank support positioning.
7. The mould for manufacturing the shield tunnel scale model according to claim 1, wherein the outer mould circumferential seam (2) and the outer mould inner bulge (3) are welded on the inner surface of the circular ring of the outer mould (1).
8. The mould for manufacturing the shield tunnel scale model according to claim 1, wherein the outer mould (1) and the inner mould (2) are respectively divided into four annular sheets along the radial direction, and the four annular sheets are spliced to form a whole ring.
9. The mould for manufacturing the shield tunnel scale model according to claim 1, wherein the external mould circumferential seam (2) and the external mould inner bulge (3) are used for simulating positive bending moment;
the inner mold outer bulge (4) is used for simulating a hogging moment.
10. The mold for manufacturing a shield tunnel scale model according to claim 1, wherein the protrusion heights of the outer mold inner protrusion (3) and the inner mold outer protrusion (4) are determined by bending rigidity reduction coefficients of longitudinal slits relative to the segments, and the protrusion heights are set according to the bending rigidity reduction coefficients so that the rigidity is equivalent;
the theoretical calculation formula is:
wherein EI represents the bending rigidity of the segment, EI Splicing joint Elastic die for expressing bending stiffness of joint and E being duct piece materialThe quantity I is the section moment of inertia, H is the thickness of the duct piece, b is the annular width of the duct piece, H is the thickness of the duct piece at the joint, and lambda is the bending rigidity reduction coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310236567.8A CN116117991A (en) | 2023-03-13 | 2023-03-13 | Mould for manufacturing shield tunnel scale model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310236567.8A CN116117991A (en) | 2023-03-13 | 2023-03-13 | Mould for manufacturing shield tunnel scale model |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116117991A true CN116117991A (en) | 2023-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310236567.8A Pending CN116117991A (en) | 2023-03-13 | 2023-03-13 | Mould for manufacturing shield tunnel scale model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116872349A (en) * | 2023-08-16 | 2023-10-13 | 江汉大学 | Mould with totally cut-off flexible joint tunnel model |
-
2023
- 2023-03-13 CN CN202310236567.8A patent/CN116117991A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116872349A (en) * | 2023-08-16 | 2023-10-13 | 江汉大学 | Mould with totally cut-off flexible joint tunnel model |
| CN116872349B (en) * | 2023-08-16 | 2024-01-23 | 江汉大学 | Mould with totally cut-off flexible joint tunnel model |
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