A permanent and temporary prefabricated ground-connected wall structure and construction method thereof for entrances and exits at different corners of a subway station

Abstract

The present invention relates to a permanent and temporary combined prefabricated ground-connected wall structure and a construction method thereof for entrances and exits at different corners of a subway station, and relates to the technical field of building construction. The permanent and temporary combined prefabricated ground-connected wall structure includes a straight wedge-shaped width, a straight-curved connecting width, and a curved wedge-shaped width; a number of straight wedge-shaped widths are connected and assembled to form a straight section side wall structure of the entrance and exit, and a number of curved wedge-shaped widths are connected and assembled to form a turning section side wall structure by adopting a multi-segment straight line fitting curve method. The straight-curved connecting width is located between the straight section side wall structure of the entrance and exit and the turning section side wall structure, and is used to connect the straight section side wall structure of the entrance and exit and the turning section side wall structure. The present invention can be applied to entrance and exit structures of different corners through the arrangement and combination of the straight wedge-shaped width, the straight-curved connecting width, and the curved wedge-shaped width, and has a wide range of applications. The wedge amount of the wedge-shaped width is the same, and the side mold can be shared, thereby reducing the number of molds and reducing the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a permanent and temporary combined prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station and a construction method thereof. Background Art

[0002] In order to promote high-quality development in the field of urban rail construction, my country has actively developed prefabricated buildings in recent years, and the construction of prefabricated subway stations has made great progress. Compared with traditional cast-in-place ground-anchored walls, prefabricated ground-anchored walls are produced in factories, with the characteristics of controllable quality, low environmental pollution and fast construction speed, which is in line with the development direction of green construction in the future. By sharing the prefabricated ground-anchored walls with the side walls of the main structure, a combination of permanent and temporary can be achieved, reducing the cost and construction period.

[0003] The entrance and exit of a subway station is a passage-type building for passengers to enter and exit the subway station. Influenced by the surrounding environment, urban planning and other factors, the passage is short and straight, and the bending angle is preferably obtuse. When a prefabricated ground-connected wall is used as the side wall of the entrance and exit structure, there is a special-shaped ground-connected wall at the obtuse corner, which makes it difficult to prefabricate and assemble the components. In addition, different entrances and exits have different bending angles, and the special-shaped wall sections at the corners need to be prefabricated separately. It is difficult to unify the mold and standardize it.

[0004] Therefore, how to provide a permanent and temporary prefabricated ground-anchored wall structure and a construction method thereof for different corner entrances and exits of subway stations has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and provide a permanent and temporary prefabricated ground-connected wall structure and a construction method thereof for different corner entrances and exits of subway stations. The structure is unified in form, simple in structure, and fast in construction. The number of molds is small and can be widely used.

[0006] To achieve the above-mentioned purpose, the present invention provides a permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of subway stations, including: a straight wedge-shaped width, a straight-curved connecting width and a curved wedge-shaped width; a number of the straight wedge-shaped widths are connected and assembled to form a straight section side wall structure of the entrance and exit, and a number of curved wedge-shaped widths are connected and assembled to form a turning section side wall structure by adopting a multi-segment straight line fitting curve method; the straight-curved connecting width is located between the straight section side wall structure of the entrance and exit and the turning section side wall structure, and is used to connect the straight section side wall structure of the entrance and exit and the turning section side wall structure.

[0007] Furthermore, adjacent straight wedge-shaped webs, between the straight wedge-shaped web and the straight-curved connecting web, between the straight-curved connecting web and the curved wedge-shaped web, and between adjacent curved wedge-shaped webs are all connected by embedded steel parts.

[0008] Furthermore, the embedded steel parts include T-shaped connectors and C-shaped connectors, and the two ends of the straight wedge-shaped width, the straight-curved connecting width and the curved wedge-shaped width are respectively provided with matching T-shaped connectors and C-shaped connectors, and the T-shaped connector is inserted into the C-shaped connector to form a mutually nested tensioning mechanism.

[0009] Furthermore, the curved wedge-shaped width comprises an inner curved wedge-shaped width and an outer curved wedge-shaped width, the inner curved wedge-shaped width is assembled on the inner side of the entrance and exit turning section, and the outer curved wedge-shaped width is assembled on the outer side of the entrance and exit turning section.

[0010] Furthermore, the inner curve wedge width and the outer curve wedge width are both isosceles trapezoids, the two oblique waist internal angles δ are the same as the straight line wedge width, the inner curve wedge width and the outer curve wedge width have different widths, and the wedge amounts are the same.

[0011] Furthermore, the curved wedge width is divided into two types: an inner curved wedge width and an outer curved wedge width. The calculation method of the long side, short side and wedge amount of the inner curved wedge width and the outer curved wedge width is as follows:

[0012] Inner curve wedge width short side x 1 =2r·sin(θ / 2)

[0013] =2r sin( β / n / 2) ;

[0014] The inner curve wedge has a long side x 2 =2(r+t)·sin(θ / 2)

[0015] Inner curve wedge width wedge amount Δx 2-1 =x 2 -x 1 =2t sin(θ / 2)

[0016] Outer curve wedge short side x 3 =2R sin(θ / 2) ;

[0017] Outer curve wedge long side x 4 =2(R+t)·sin(θ / 2) ;

[0018] Outer curve wedge width wedge amount Δx 4-3 =x 4 -x 3 =2t sin(θ / 2) ;

[0019] in， The angle of the entrance and exit turning section is α , the center angle of the turning segment fitting curve is β ,but β=180°-α ; Number of curve wedge widths n , then the central angle of each wedge-shaped ground-wall connection is θ=β / n=(180°-α) / n ; The radius of the fitting curve of the inner turning section is r , the radius of the fitting curve of the outer turning section is R , thickness of prefabricated diaphragm wall t , Net width of entrance and exit passages b ,but R=r+t+ b ; The short side of the inner curve wedge is x 1 , the inner curved wedge has a long side x 2 , the outer curve wedge width short side x 3 , the outer curve wedge width long side x 4 .

[0020] Furthermore, the straight wedge width is an isosceles trapezoid, and the oblique waist internal angle θ is the same as that of the curved wedge width, and the straight section side wall structure of the entrance and exit is formed by alternately assembling long and short sides.

[0021] Furthermore, the straight-curved connecting width is a right-angled trapezoid, and the inner angle δ formed by the base and the oblique waist is the same as the oblique waist inner angles of the straight wedge width, the inner curved wedge width and the outer curved wedge width.

[0022] A construction method for a permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station, comprising the following steps:

[0023] S1: Complete the production of prefabricated straight wedge-shaped sections, curved wedge-shaped sections and straight-curved connecting sections of the ground-connected wall and transport them to the construction site for storage;

[0024] S2: Single-sided construction, first construct the inner prefabricated ground-connected wall and then the outer prefabricated ground-connected wall;

[0025] S3: When constructing the inner prefabricated ground-connecting wall, first make grooves for the ground-connecting wall in the turning section, and then assemble the curved wedge-shaped sections; then, make grooves from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections;

[0026] S4: When constructing the outer prefabricated ground-connected wall, first make trenches for the ground-connected wall in the turning section, and then assemble the curved wedge-shaped sections; then, make trenches from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections.

[0027] The beneficial effects of the present invention are:

[0028] (1) The present invention can be applied to inlet and outlet structures with different rotation angles (90° to 180°) through the arrangement and combination of straight wedge-shaped widths, curved wedge-shaped widths and straight-curved connecting widths, and has a wide range of applications;

[0029] (2) The straight wedge-shaped web, curved wedge-shaped web and straight-curved connecting web have simple structures, the wedge-shaped web has the same wedge shape, and the side molds can be shared, thus reducing the number of prefabricated molds and the cost.

[0030] (3) The vertical joints between adjacent straight wedge-shaped webs, between a straight wedge-shaped web and a straight-curved connecting web, between a straight-curved connecting web and a curved wedge-shaped web, and between adjacent curved wedge-shaped webs are all connected by embedded steel parts, which have a simple structure, are stable and reliable, and are quick to construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a straight wedge-shaped structural diagram of a permanent and temporary prefabricated ground-connected wall used for different corner entrances and exits of subway stations according to the present invention;

[0032] Figure 2 This is a structural diagram of a permanent and temporary prefabricated ground connection wall with straight and curved connection sections for different corner entrances and exits of a subway station according to the present invention;

[0033] Figure 3 This is a curved wedge-shaped structural diagram of a permanent and temporary prefabricated ground-connected wall for entrances and exits at different corners of a subway station according to the present invention;

[0034] Figure 4 It is a schematic diagram of a vertical joint between permanent and temporary prefabricated ground-connected wall panels used for different corner entrances and exits of a subway station according to the present invention;

[0035] Figure 5 It is a schematic diagram of assembling a prefabricated ground-connected wall with a permanent combination of straight segments for entrances and exits at different corners of a subway station according to the present invention;

[0036] Figure 6 It is a schematic diagram of assembling a permanent and temporary prefabricated ground-connected wall for a turning section at different entrances and exits of a subway station according to the present invention;

[0037] Figure 7 It is a cross-sectional schematic diagram of the entrance and exit structures at different corners of a subway station according to the present invention;

[0038] Figure 8 This is a schematic diagram of assembling a prefabricated ground-connected wall for an obtuse-angle (105°) entrance and exit of a subway station according to the present invention;

[0039] Figure 9 This is a schematic diagram of assembling a prefabricated ground-connected wall for an obtuse-angle (120°) entrance and exit of a subway station according to the present invention;

[0040] Figure 10This is a schematic diagram of assembling a prefabricated ground-connected wall for an obtuse-angle (135°) entrance and exit of a subway station according to the present invention;

[0041] Figure 11 This is a schematic diagram of assembling a prefabricated ground-connected wall for an obtuse-angle (150°) entrance and exit of a subway station according to the present invention;

[0042] Figure 12 The diagram of the process of deriving the side length and wedge amount of the wedge-shaped ground-connected wall in the turning section of the present invention is shown in FIG. Figure one ;

[0043] Figure 13 The diagram of the process of deriving the side length and wedge amount of the wedge-shaped ground-connected wall in the turning section of the present invention is shown in FIG. Figure 2 .

[0044] Among them, in the figure:

[0045] 1- Straight wedge-shaped width; 2- Straight-curved connecting width; 3- Inner curved wedge-shaped width; 4- Outer curved wedge-shaped width; 5- T-shaped connector; 6- C-shaped connector. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0049] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0050] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] like Figure 1-7 As shown, the present invention provides a permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station, comprising: a straight wedge-shaped width 1, a straight-curved connecting width 2 and a curved wedge-shaped width; a number of the straight wedge-shaped widths 1 are connected and assembled to form a straight section side wall structure of the entrance and exit, and a number of curved wedge-shaped widths are connected and assembled to form a turning section side wall structure by adopting a multi-segment straight line fitting curve method; the straight-curved connecting width 2 is located between the straight section side wall structure of the entrance and exit and the turning section side wall structure, and is used to connect the straight section side wall structure of the entrance and exit and the turning section side wall structure.

[0052] To further optimize the technical solution, adjacent straight wedge-shaped widths 1, between the straight wedge-shaped width 1 and the straight-curved connecting width 2, between the straight-curved connecting width 2 and the curved wedge-shaped width, and between adjacent curved wedge-shaped widths are all connected by embedded steel parts.

[0053] The embedded steel parts include T-shaped connectors 5 and C-shaped connectors 6. The two ends of the straight wedge-shaped web 1, the straight-curved connecting web 2 and the curved wedge-shaped web are respectively provided with matching T-shaped connectors 5 and C-shaped connectors 6. By inserting the T-shaped connector 5 into the C-shaped connector 6, a mutually nested tensioning mechanism is formed. Figure 4 This is a schematic diagram of the vertical joint structure between prefabricated ground-connected walls. Two adjacent prefabricated ground-connected walls are connected by embedded steel parts. The T-shaped connector 5 of the next prefabricated wall is inserted into the C-shaped connector 6 of the previous prefabricated wall to form a mutually nested tensioning mechanism, and grouting is performed in the gap to achieve the purpose of waterproofing.

[0054] The curved wedge-shaped width comprises an inner curved wedge-shaped width 3 and an outer curved wedge-shaped width 4. The inner curved wedge-shaped width 3 is assembled on the inner side of the entrance and exit turning section, and the outer curved wedge-shaped width 4 is assembled on the outer side of the entrance and exit turning section.

[0055] Furthermore, the curved wedge width is divided into two types: an inner curved wedge width and an outer curved wedge width. The calculation method of the long side, short side and wedge amount of the inner curved wedge width and the outer curved wedge width is as follows:

[0056] Inner curve wedge width short side x 1 =2r·sin(θ / 2)

[0057] =2r sin( β / n / 2) ;

[0058] The inner curve wedge has a long side x 2 =2(r+t)·sin(θ / 2)

[0059] Inner curve wedge width wedge amount Δx 2-1 =x 2 -x 1 =2t sin(θ / 2)

[0060] Outer curve wedge short side x 3 =2R sin(θ / 2) ;

[0061] Outer curve wedge long side x 4 =2(R+t)·sin(θ / 2) ;

[0062] Outer curve wedge width wedge amount Δx 4-3 =x 4 -x 3 =2t sin(θ / 2) ;

[0063] in ， The angle of the entrance and exit turning section is α , the center angle of the turning segment fitting curve is β ,but β=180°-α ; Number of curve wedge widths n , then the central angle of each wedge-shaped ground-wall connection is θ=β / n=(180°-α) / n ; The radius of the fitting curve of the inner turning section is r , the radius of the fitting curve of the outer turning section is R , thickness of prefabricated diaphragm wall t , Net width of entrance and exit passages b ,but R=r+t+ b ; The short side of the inner curve wedge is x 1 , the inner curved wedge has a long side x2 , the outer curve wedge width short side x 3 , the outer curve wedge width long side x 4 .

[0064] Figure 12 and Figure 13 It is a schematic diagram of the process of deriving the side length and wedge amount of the wedge-shaped ground-connected wall in the turning section of the present invention, and various calculation parameters are marked in the figure.

[0065] The derivation process is as follows:

[0066] (1) The fitting circular curve of the turning section is tangent to the original structural contour line. Assume that the angle of the turning section is α , then the central angle corresponding to the fitting curve segment can be deduced as: β=180°-α ;

[0067] (2) According to the principle of transforming curves into straight lines, the tangent circle curve segments are fitted by multiple short straight lines (assuming that they are divided into n wedge-shaped ground wall), that is, the central angle β according to n If the angles are evenly divided, the central angle of each wedge-shaped ground-connected wall is: θ=β / n=(180°- α） / n ;

[0068] (3) Each wedge-shaped ground-connected wall and the line connecting the centers of the tangent circles form two similar triangles, with the lengths of the hypotenuse being r、r+t , the vertex angle is I, According to the trigonometric function calculation formula, we can get:

[0069] first ,sin(θ / 2)=x 1 / 2 / r, then x 1 =2r·sin(θ / 2)=2r·sin(β / n / 2) ;

[0070] same, sin(θ / 2)=x 2 / 2 / （r+t） ,but x 2 =2(r+t)·sin(θ / 2)

[0071] Therefore, the wedge width of the inner curve is Δx 2-1 =x 2 -x 1 =2t sin(θ / 2)

[0072] Similarly, we can conclude that:

[0073] Outer curve wedge short side x3 =2R sin(θ / 2) ;

[0074] Outer curve wedge long side x 4 =2(R+t)·sin(θ / 2) ;

[0075] Outer curve wedge width wedge amount Δx 4-3 =x 4 -x 3 =2t·sin(θ / 2).

[0076] like Figure 6 As shown, taking the wedge width of the subway station entrance and exit curve as an example, according to the above calculation method, the subway station entrance and exit angle is α= 120°, the turning section is planned to be assembled with 8 curved wedge-shaped sections n =8, the net width of the entrance and exit side walls is b=6.0m, the width of the straight wedge is considered to be 2.5m, and the wall thickness is t=0.6m.

[0077] The radius of the fitting curve of the inner turning section is calculated as 4 times the width of the straight wedge. r= 4×2.5 = 10.0 m , the radius of the outer turning section fitting curve R=r+t+b= 16.6 m ; The center angle of the curve corresponding to the turning segment β= 180 °-α= 60 ° , each curved wedge-shaped ground-wall connection corresponds to the central angle i = β / n=（ 180 °-α） / n= 7.5 ° .

[0078] Inner curve wedge width short side x 1 = 2 r·sin(θ / 2 ) = 2*10000*sin(7.5° / 2)=1308mm;

[0079] The inner curve wedge has a long side x 2 = 2 (r+t)·sin(θ / 2 ) = 2*10600*sin(7.5° / 2)=1386mm;

[0080] Inner curve wedge width wedge amount Δx 2-1=x 2 -x 1 = 2 t·sin(θ / 2 ) = 2*600*sin(7.5° / 2)=78mm;

[0081] Outer curve wedge short side x 3 = 2 R sin(θ / 2 ) = 2*16600*sin(7.5° / 2)=2171mm;

[0082] Outer curve wedge long side x 4 = 2 (R+t)·sin(θ / 2 )= 2*17200*sin(7.5° / 2)=2249mm;

[0083] Outer curve wedge width wedge amount Δx 4-3 =x 4 -x 3 = 2 tsin(θ / 2 ) = 2*600*sin(7.5° / 2) = 78mm.

[0084] In addition, if Figure 8-11 As shown, the entrance and exit corners of the subway station are α= 105°, 120°, 135°, 150°.

[0085] like Figure 1 As shown, the straight wedge-shaped web 1 is an isosceles trapezoid, with an inner angle of the oblique waist of θ, and the straight section side wall structure of the entrance and exit is formed by alternately assembling long and short sides. A T-shaped connector 5 is pre-embedded on the oblique waist at one end of the straight wedge-shaped web 1, and a C-shaped connector 6 is pre-embedded on the oblique waist at the other end.

[0086] like Figure 3 As shown, the inner curve wedge width 3 and the outer curve wedge width 4 are both isosceles trapezoids, and the two oblique waist internal angles δ are the same as the straight wedge width 1, but the width is smaller. The inner curve wedge width 3 and the outer curve wedge width 4 have different widths and the same wedge amount.

[0087] like Figure 2As shown, the straight-curved connecting width 2 is a right-angled trapezoid, and the inner angle δ formed by the base and the oblique waist is the same as the oblique waist inner angle of the straight wedge-shaped width 1, the inner curved wedge-shaped width 3 and the outer curved wedge-shaped width 4. A T-shaped connector 5 is pre-embedded on the straight waist at one end of the straight-curved connecting width 2, and a C-shaped connector 6 is pre-embedded on the oblique waist at the other end.

[0088] The present invention also provides a construction method of a permanent and temporary combined prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station, comprising the following steps:

[0089] S1: Complete the production of prefabricated straight wedge-shaped sections, curved wedge-shaped sections and straight-curved connecting sections of the ground-connected wall and transport them to the construction site for storage;

[0090] S2: Single-sided construction, first construct the inner prefabricated ground-connected wall and then the outer prefabricated ground-connected wall;

[0091] S3: When constructing the inner prefabricated ground-connecting wall, first make grooves for the ground-connecting wall in the turning section, and then assemble the curved wedge-shaped sections; then, make grooves from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections;

[0092] S4: When constructing the outer prefabricated ground-connected wall, first make trenches for the ground-connected wall in the turning section, and then assemble the curved wedge-shaped sections; then, make trenches from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections.

[0093] The present invention can be applied to entrance and exit structures with different rotation angles (90° to 180°) through the arrangement and combination of straight wedge-shaped widths, curved wedge-shaped widths and straight-curved connecting widths, and has a wide range of applications; the straight wedge-shaped widths, curved wedge-shaped widths and straight-curved connecting widths have simple structures, the same wedge amounts, and can share side molds, thereby reducing the number of prefabricated molds and reducing the cost; the vertical seam joints between adjacent straight wedge-shaped widths, between the straight wedge-shaped widths and the straight-curved connecting widths, between the straight-curved connecting widths and the curved wedge-shaped widths, and between adjacent curved wedge-shaped widths are all connected by pre-buried steel parts, and have a simple structure, are stable and reliable, and are quick to construct.

[0094] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station, characterized in that: include: Straight wedge-shaped webs, straight-curved connecting webs and curved wedge-shaped webs; A plurality of the straight wedge-shaped webs are connected and assembled to form a straight section side wall structure of the entrance and exit, and a plurality of curved wedge-shaped webs are connected and assembled to form a turning section side wall structure by adopting a multi-segment straight line fitting curve method, and the straight-curved connecting web is located between the straight section side wall structure of the entrance and exit and the turning section side wall structure, and is used to connect the straight section side wall structure of the entrance and exit and the turning section side wall structure; The curved wedge-shaped web comprises an inner curved wedge-shaped web and an outer curved wedge-shaped web, wherein the inner curved wedge-shaped web is assembled on the inner side of the entrance and exit turning section, and the outer curved wedge-shaped web is assembled on the outer side of the entrance and exit turning section; The inner curve wedge width and the outer curve wedge width are both isosceles trapezoids, the two oblique waist internal angles are θ, the inner curve wedge width and the outer curve wedge width are different in width, and the wedge amount is the same; The wedge-shaped curve width is divided into two types: the inner wedge-shaped curve width and the outer wedge-shaped curve width. The calculation method of the long side, short side and wedge amount of the inner wedge-shaped curve width and the outer wedge-shaped curve width is as follows: Inner curve wedge short side x 1 =2r·sin(θ / 2) =2r·sin(β / n / 2) ； Inner curve wedge width long side x 2 =2(r+t)·sin(θ / 2) Inner curve wedge width wedge amount Δx 2-1 =x 2 -x 1 =2t·sin(θ / 2) Outer curve wedge short side x 3 =2R·sin(θ / 2) ; Outer curve wedge long side x 4 =2(R+t)·sin(θ / 2) ; Outer curve wedge width wedge amount Δx 4-3 =x 4 -x 3 =2t·sin(θ / 2) ; in ， The angle of the entrance and exit turning section is α , the center angle of the turning segment fitting curve is β ,but β=180°-α ; Curve wedge width quantity n , then the central angle of each wedge-shaped ground-wall connection is θ = β / n = (180° - α) / n ; The radius of the fitting curve of the inner turning section is r , the radius of the fitting curve of the outer turning section is R , thickness of prefabricated diaphragm wall t , Net width of entrance and exit passages b ,but R=r+t+b ; The short side of the inner curved wedge is x 1 , the inner curved wedge has a long side x 2 , the outer curve wedge width short side x 3 , the outer curve wedge width long side x 4 ; The straight wedge width is an isosceles trapezoid, and the oblique waist internal angle is θ, which is the same as the curved wedge width. The long and short sides are alternately assembled to form the side wall structure of the straight section of the entrance and exit; The straight-curved connecting width is a right-angled trapezoid, and the internal angle θ formed by the base and the oblique waist is the same as the oblique waist internal angles of the straight wedge width, the inner curved wedge width and the outer curved wedge width.

2. A permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station as claimed in claim 1, characterized in that: Adjacent straight wedge-shaped webs, between the straight wedge-shaped web and the straight-curved connecting web, between the straight-curved connecting web and the curved wedge-shaped web, and between adjacent curved wedge-shaped webs are all connected by embedded steel parts.

3. A permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station as claimed in claim 2, characterized in that: The embedded steel parts include T-shaped connectors and C-shaped connectors. The two ends of the straight wedge-shaped web, the straight-curved connecting web and the curved wedge-shaped web are respectively provided with matching T-shaped connectors and C-shaped connectors. By inserting the T-shaped connector into the C-shaped connector, a mutually nested tensioning mechanism is formed.

4. A construction method for a permanent and temporary prefabricated ground-connected wall structure for entrances and exits at different corners of a subway station as described in any one of claims 1 to 3, characterized in that: The steps include: S1: Complete the production of prefabricated straight wedge-shaped sections, curved wedge-shaped sections and straight-curved connecting sections of the ground-connected wall and transport them to the construction site for storage; S2: Single-sided construction, first construct the inner prefabricated ground-connected wall and then the outer prefabricated ground-connected wall; S3: When constructing the inner prefabricated ground-connecting wall, first make grooves for the ground-connecting wall in the turning section, and then assemble the curved wedge-shaped sections; then, make grooves from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections; S4: When constructing the outer prefabricated ground-connected wall, first make trenches for the ground-connected wall in the turning section, and then assemble the curved wedge-shaped sections; then, make trenches from the turning section to the straight sections on both sides in sequence, and use a crane to assemble the straight-curved connecting sections and the straight wedge-shaped sections.

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