Inverted arch primary support end mold positioning device and inverted arch excavation control fixture

Abstract

The utility model relates to the field of tunnel construction, and provides an inverted arch primary support end head formwork positioning device and an inverted arch excavation control fixture. The inverted arch primary support end head formwork positioning device comprises a pair of side forms, which are arranged at intervals along the width direction of the tunnel; a transverse formwork, the two ends of which are connected between the pair of side forms; and a filling end formwork, which is arranged below the transverse formwork and is provided with hinges along the width direction of the filling end formwork. The inverted arch primary support end head formwork positioning device can form a stable frame structure, withstand various forces and pressures during the construction process, ensure the accuracy and stability of the end formwork positioning; reduce the possibility of concrete leakage; reduce the labor intensity of workers, and improve work efficiency. The inverted arch primary support end head formwork positioning device is suitable for various tunnel construction scenes and meets different construction needs. Through reasonable structural design and material selection, the device can effectively resist external interference and damage and ensure safety during the construction process.

Description

Technical Field

[0001] The utility model relates to the field of tunnel construction and provides an inverted arch primary support end mold positioning device and an inverted arch excavation control fixture. Background Art

[0002] At present, it is difficult to control over-excavation and under-excavation during the construction of tunnel invert arches, which can easily lead to excessive over-excavation and waste of concrete. After the initial support of the invert arch is shotcrete-cast, the joints between the bottom of the invert arch end formwork and the surface of the initial support of the invert arch are not dense, which can easily cause slurry leakage when pouring concrete. In addition, since the tunnel is wide, it is not easy to store and transport the end formwork of the initial support of the invert arch after use. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes an inverted arch primary support end mold positioning device, which can provide an effective reference for the over-excavation and under-excavation of the inverted arch to avoid affecting the construction quality.

[0004] The embodiment of the utility model also provides an invert excavation control fixture.

[0005] The first embodiment of the utility model provides a positioning device for an initial support end mold of an inverted arch, comprising:

[0006] A pair of side molds, the pair of side molds are arranged at intervals along the width direction of the tunnel;

[0007] A transverse mold, the two ends of which are connected between a pair of side molds;

[0008] The filling end mold is arranged below the transverse mold, and a hinge is arranged on the filling end mold along the width direction of the filling end mold.

[0009] According to the first aspect of the utility model, the positioning device for the initial support end mold of the inverted arch provided by the embodiment is arranged at intervals along the width direction of the tunnel through a pair of side molds, and connected to the two ends of the cross mold to form a stable frame structure. This structure can withstand various forces and pressures during the construction process, ensuring the accuracy and stability of the end mold positioning. The setting of the filling end mold makes it possible to effectively fill and fix the end part when pouring concrete, reducing the possibility of concrete leakage, thereby improving construction efficiency. The hinges set on the filling end mold make the device more convenient and quick during disassembly and assembly, reducing the labor intensity of workers and improving work efficiency. The device is suitable for various tunnel construction scenes, whether it is a large or small tunnel, and can effectively realize the positioning of the initial support end of the inverted arch, meeting different construction requirements. Through reasonable structural design and material selection, the device can effectively resist external interference and damage, ensuring safety during construction.

[0010] According to one embodiment of the utility model, the filling end mold comprises:

[0011] A vertical rib, the top end of which is connected to the transverse mold, and the hinge is arranged on the vertical rib;

[0012] The inverted arch mold is adapted to the shape of the inverted arch and is connected to the bottom of the vertical ribs.

[0013] According to an embodiment of the utility model, the vertical ribs are multiple, and the multiple vertical ribs are arranged at intervals along the length direction of the transverse mold;

[0014] The filling end mold also includes an end mold plate, and the end mold plate is arranged between two adjacent vertical ribs.

[0015] According to an embodiment of the utility model, the transverse mold includes a plurality of segmented molds, two adjacent segmented molds are hinged, and the hinge point of two adjacent segmented molds corresponds to the position of the vertical rib on which the hinge is provided.

[0016] According to one embodiment of the utility model, the invert arch formwork comprises a steel plate, and along the length direction of the tunnel, the width of the steel plate is at least 50 mm and the thickness is at least 5 mm.

[0017] According to an embodiment of the utility model, the side mold comprises a square steel tube, and the width of the square steel tube along the length direction of the tunnel is at least 30 mm.

[0018] According to an embodiment of the present invention, the center line of the square steel tube coincides with the center line of the steel plate.

[0019] According to an embodiment of the utility model, a hanging ring is provided on the transverse mold.

[0020] According to an embodiment of the utility model, a pair of the side molds, the transverse mold and the filling end mold are welded together.

[0021] The second aspect of the utility model provides an invert excavation control fixture, comprising the invert primary support end mold positioning device as described above.

[0022] The inverted arch excavation control fixture provided by the second embodiment of the utility model further improves the control accuracy and efficiency in the tunnel construction process by integrating the above-mentioned inverted arch primary support end head mold positioning device. Since the inverted arch primary support end head mold positioning device has a high degree of stability and accuracy, applying it to the inverted arch excavation control fixture can ensure that the position control in the excavation process is more accurate, avoiding excavation deviation and waste. The inverted arch excavation control fixture utilizes the stable structure of the positioning device to quickly and accurately fix the excavation position, reducing the adjustment and correction time in the construction process, thereby improving the overall construction efficiency. By accurately controlling the excavation position and depth, the inverted arch excavation control fixture can effectively avoid the over-excavation or under-excavation phenomenon that may occur in the excavation process, reducing the potential safety hazards in construction. Since the inverted arch primary support end head mold positioning device has a wide range of applicability, the inverted arch excavation control fixture is also suitable for tunnel construction of different scales and types, improving the versatility and flexibility of construction equipment.

[0023] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0024] According to the first aspect of the utility model, the positioning device for the initial support end mold of the inverted arch provided by the embodiment is arranged at intervals along the width direction of the tunnel through a pair of side molds, and connected to the two ends of the cross mold to form a stable frame structure. This structure can withstand various forces and pressures during the construction process, ensuring the accuracy and stability of the end mold positioning. The setting of the filling end mold makes it possible to effectively fill and fix the end part when pouring concrete, reducing the possibility of concrete leakage, thereby improving construction efficiency. The hinges set on the filling end mold make the device more convenient and quick during disassembly and assembly, reducing the labor intensity of workers and improving work efficiency. The device is suitable for various tunnel construction scenes, whether it is a large or small tunnel, and can effectively realize the positioning of the initial support end of the inverted arch, meeting different construction requirements. Through reasonable structural design and material selection, the device can effectively resist external interference and damage, ensuring safety during construction.

[0025] Furthermore, the inverted arch excavation control fixture provided by the second embodiment of the utility model further improves the control accuracy and efficiency in the tunnel construction process by integrating the above-mentioned inverted arch primary support end head mold positioning device. Since the inverted arch primary support end head mold positioning device has a high degree of stability and accuracy, applying it to the inverted arch excavation control fixture can ensure that the position control in the excavation process is more accurate, avoiding excavation deviation and waste. The inverted arch excavation control fixture utilizes the stable structure of the positioning device to quickly and accurately fix the excavation position, reducing the adjustment and correction time in the construction process, thereby improving the overall construction efficiency. By accurately controlling the excavation position and depth, the inverted arch excavation control fixture can effectively avoid the over-excavation or under-excavation phenomenon that may occur in the excavation process, reducing the potential safety hazards in construction. Since the inverted arch primary support end head mold positioning device has a wide range of applicability, the inverted arch excavation control fixture is also suitable for tunnel construction of different scales and types, improving the versatility and flexibility of construction equipment.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic structural diagram of the positioning device of the initial support end mold of the inverted arch provided by the embodiment of the utility model;

[0029] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0030] Reference numerals:

[0031] 100, side form; 102, transverse form; 104, filling end form; 106, hinge; 108, vertical reinforcement; 110, invert form; 112, end formwork; 114, lifting ring. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0033] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0035] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] like Figure 1 and Figure 2As shown, the first embodiment of the utility model provides a positioning device for the initial support end mold of an inverted arch, comprising:

[0038] A pair of side molds 100, the pair of side molds 100 are arranged at intervals along the width direction of the tunnel;

[0039] A transverse mold 102, both ends of which are connected between a pair of side molds 100;

[0040] The filling end mold 104 is disposed below the transverse mold 102 , and a hinge 106 is disposed on the filling end mold 104 along the width direction of the filling end mold 104 .

[0041] According to the first aspect of the utility model, the positioning device for the initial support end mold of the inverted arch provided by the embodiment is arranged at intervals along the width direction of the tunnel through a pair of side molds 100, and connected to the two ends of the cross mold 102 to form a stable frame structure. This structure can withstand various forces and pressures during the construction process, ensuring the accuracy and stability of the end mold positioning. The setting of the filling end mold 104 enables the end part to be effectively filled and fixed when pouring concrete, reducing the possibility of concrete leakage, thereby improving construction efficiency. The hinge 106 provided on the filling end mold 104 makes the device more convenient and quick during disassembly and assembly, reducing the labor intensity of workers and improving work efficiency. The device is suitable for various tunnel construction scenes, whether it is a large or small tunnel, it can effectively realize the positioning of the initial support end of the inverted arch, and meet different construction requirements. Through reasonable structural design and material selection, the device can effectively resist external interference and damage, ensuring safety during construction.

[0042] Please continue to see Figure 1 and Figure 2 The positioning device of the initial support end mold of the inverted arch includes a pair of side molds 100, a transverse mold 102 and a filling end mold 104.

[0043] The side molds 100 are arranged at intervals along the width direction of the tunnel. The design of the side molds 100 takes into account the width of the tunnel and the construction requirements, ensuring that they can stably support and fix the entire positioning device. The side molds 100 are usually made of strong and durable metal materials to withstand various forces and pressures during the construction process.

[0044] The transverse mold 102 is a structural component connected between a pair of side molds 100, and its two ends are respectively connected to the side molds 100. The setting of the transverse mold 102 enhances the stability of the entire positioning device, so that it can remain stable during the construction process. The material of the transverse mold 102 is also selected to be a strong and durable metal material to ensure that it can withstand the pressure from above.

[0045] The filling end mold 104 is arranged below the transverse mold 102, and its main function is to fill and fix the end part to prevent concrete from leaking during the pouring process. The design of the filling end mold 104 takes into account the convenience and stability of construction, so that it can be conveniently used in conjunction with the transverse mold 102 and the side mold 100. In addition, a hinge 106 is arranged along the width direction of the filling end mold 104. The setting of the hinge 106 allows the filling end mold 104 to be easily opened and closed when necessary, thereby facilitating adjustment and disassembly during the construction process. The material of the hinge 106 is a durable and easy-to-operate metal material to ensure that it can work stably for a long time.

[0046] According to one embodiment of the present invention, the filling end mold 104 includes:

[0047] A vertical rib 108, the top of which is connected to the transverse mold 102, and the hinge 106 is disposed on the vertical rib 108;

[0048] The inverted arch mold 110 is adapted to the shape of the inverted arch and is connected to the bottom of the vertical rib 108 .

[0049] In the embodiment of the present invention, the filling end mold 104 is mainly composed of two parts: a vertical rib 108 and an inverted arch mold 110 .

[0050] The vertical rib 108 is the skeleton part of the filling end mold 104, and its top is connected to the cross mold 102 to ensure the stability and support of the entire filling end mold 104. The design of the vertical rib 108 takes into account the stress conditions during the construction process, and is made of high-strength, corrosion-resistant materials to ensure that it can work stably for a long time. In addition, the hinge 106 is cleverly arranged on the vertical rib 108, which makes the filling end mold 104 easy to open and close when needed, providing great convenience for construction operations. Through the connection of the vertical rib 108 with the cross mold 102, and the bottom connection of the inverted arch mold 110 with the vertical rib 108, the filling end mold 104 and the entire positioning device form a stable overall structure, which greatly enhances the stability of the positioning device.

[0051] The hinge 106 is arranged on the vertical rib 108, so that the filling end mold 104 can be easily opened and closed when needed, which provides great convenience for the construction personnel. This design not only simplifies the operation steps, but also reduces the construction difficulty.

[0052] The inverted arch form 110 is another important component of the filling end form 104, and its shape is adapted to the shape of the inverted arch, and can be accurately fitted on the surface of the inverted arch. The design of the inverted arch form 110 fully considers the structural characteristics and construction requirements of the inverted arch, and ensures that it can effectively fix the end portion to prevent concrete from leaking during the pouring process. At the same time, the inverted arch form 110 is connected to the bottom of the vertical ribs 108 to form a stable overall structure, which further enhances the stability and supporting force of the filling end form 104. The inverted arch form 110 is adapted to the shape of the inverted arch, and can accurately fix the end portion to effectively prevent concrete from leaking, thereby reducing unnecessary waste and repair work, and improving construction efficiency.

[0053] According to an embodiment of the present invention, there are multiple vertical ribs 108, and the multiple vertical ribs 108 are arranged at intervals along the length direction of the transverse mold 102;

[0054] The filling end mold 104 further includes an end mold plate 112 , and the end mold plate 112 is disposed between two adjacent vertical ribs 108 .

[0055] In the embodiment of the utility model, the filling end mold 104 includes a plurality of vertical ribs 108. These vertical ribs 108 are arranged at intervals along the length direction of the cross mold 102 to form an orderly arrangement. The top of each vertical rib 108 is connected to the cross mold 102, ensuring the stability and support of the entire filling end mold 104. The provision of a plurality of vertical ribs 108 enables the filling end mold 104 to better adapt to inverts of different shapes and sizes, thereby improving its applicability. The provision of a plurality of vertical ribs 108 enables the filling end mold 104 to have a stronger support force and stability, and to be able to withstand greater pressure and impact. At the same time, the addition of the end mold plate 112 also enhances the overall structural strength of the filling end mold 104, making it more stable and reliable.

[0056] In addition, by adjusting the number and spacing of the vertical ribs 108, and the shape and size of the end template 112, the filling end template 104 in this embodiment can adapt to inverts of different shapes and sizes. This makes the positioning device more widely applicable in tunnel construction and can meet different construction requirements.

[0057] The end template 112 is arranged between two adjacent vertical ribs 108, and plays a role of connection and fixing. The shape and size of the end template 112 can be designed as needed to ensure that it can fit closely with the surface of the inverted arch. The addition of the end template 112 not only enhances the overall structural strength of the filling end template 104, but also improves its positioning accuracy for the end of the inverted arch.

[0058] The provision of the end template 112 enables the filling end template 104 to fit more accurately on the surface of the inverted arch, thereby improving the positioning accuracy of the end of the inverted arch, which helps to reduce errors and deviations during the construction process and ensure construction quality and safety.

[0059] According to an embodiment of the present invention, the transverse mold 102 includes a plurality of segmented molds, and two adjacent segmented molds are hinged, and the hinge points of the two adjacent segmented molds correspond to the positions of the vertical ribs 108 provided with the hinges 106 .

[0060] In an embodiment of the utility model, the transverse mold 102 is composed of a plurality of segmented molds, and these segmented molds are connected by hinges. This design allows the transverse mold 102 to be flexibly adjusted when necessary to adapt to different construction environments and needs. By adopting the segmented mold and hinged design, the transverse mold 102 can adapt to different construction environments and needs more flexibly, thereby improving the applicability and practicality of the positioning device. The corresponding design of the hinge point and the hinge 106 position enhances the structural stability of the entire positioning device, so that it can remain stable and reliable during the construction process. Since the transverse mold 102 can be flexibly adjusted, construction personnel can complete the positioning and fixing work more conveniently and quickly during the operation, thereby improving the construction efficiency.

[0061] According to one embodiment of the utility model, the inverted arch form 110 includes a steel plate, and the width of the steel plate is at least 50 mm and the thickness is at least 5 mm along the length direction of the tunnel; the side form 100 includes a square steel tube, and the width of the square steel tube is at least 30 mm along the length direction of the tunnel; the center line of the square steel tube coincides with the center line of the steel plate.

[0062] In the embodiment of the utility model, the inverted arch form 110 is mainly composed of a steel plate, and its width and thickness are carefully calculated and selected. Along the length direction of the tunnel, the width of the steel plate is at least 50 mm, which ensures that the inverted arch form 110 has sufficient lateral support force and can withstand various forces and pressures during the construction process. At the same time, the thickness of the steel plate is at least 5 mm. This design not only ensures the strength of the inverted arch form 110, but also makes it have sufficient wear resistance and durability, so that it can work stably for a long time in a harsh construction environment.

[0063] The side form 100 uses square steel tubes as the main structural material, and its width is also precisely calculated. Along the length of the tunnel, the width of the square steel tube is at least 30 mm, which ensures the stability and load-bearing capacity of the side form 100. In addition, the center line of the square steel tube coincides with the center line of the steel plate. This design allows the invert form 110 and the side form 100 to fit closely together to form a stable overall structure. This design not only enhances the overall stability of the positioning device, but also helps to improve construction accuracy and efficiency.

[0064] By optimizing the materials and structural dimensions of the inverted arch form 110 and the side form 100, the overall stability of the positioning device has been significantly improved. This helps to reduce displacement and deformation during construction and ensure the accuracy of positioning. The selection of steel plates and square steel pipes and the appropriate size design make the positioning device have a higher load-bearing capacity, can withstand greater construction loads, and ensure construction safety. Because the positioning device has a stable structure and close fit, construction personnel can complete the positioning and fixing work more quickly and accurately during operation, thereby improving construction efficiency.

[0065] According to an embodiment of the present invention, a hanging ring 114 is provided on the transverse mold 102 .

[0066] In the embodiment of the present invention, the hanging ring 114 is firmly mounted on the transverse mold 102, and its material is usually made of high-strength and corrosion-resistant metal to ensure that it can withstand sufficient tension during use.

[0067] The provision of the lifting ring 114 makes the positioning device more convenient during the lifting process. Construction personnel can use the lifting ring 114 to quickly and accurately lift the positioning device to the designated position, greatly improving construction efficiency. Using the lifting ring 114 for lifting operations can reduce the risks of manual handling and installation, reduce the probability of accidents during the construction process, and improve construction safety.

[0068] According to an embodiment of the present invention, a pair of side molds 100 , a transverse mold 102 and a filling end mold 104 are connected by welding.

[0069] In the embodiment of the utility model, the welding connection makes the side mold 100, the transverse mold 102 and the filling end mold 104 form a whole, eliminating the gap and looseness between the components, thereby enhancing the structural stability of the entire positioning device. The welding connection has high strength and can withstand various forces and pressures during the construction process, ensuring that the positioning device remains stable in a complex and changeable construction environment. Compared with other connection methods, the welding connection has a faster construction speed, which can shorten the construction period and improve construction efficiency.

[0070] The second aspect of the utility model provides an invert excavation control fixture, comprising the invert primary support end mold positioning device as described above.

[0071] The inverted arch excavation control fixture provided by the second embodiment of the utility model further improves the control accuracy and efficiency in the tunnel construction process by integrating the above-mentioned inverted arch primary support end head mold positioning device. Since the inverted arch primary support end head mold positioning device has a high degree of stability and accuracy, applying it to the inverted arch excavation control fixture can ensure that the position control in the excavation process is more accurate, avoiding excavation deviation and waste. The inverted arch excavation control fixture utilizes the stable structure of the positioning device to quickly and accurately fix the excavation position, reducing the adjustment and correction time in the construction process, thereby improving the overall construction efficiency. By accurately controlling the excavation position and depth, the inverted arch excavation control fixture can effectively avoid the over-excavation or under-excavation phenomenon that may occur in the excavation process, reducing the potential safety hazards in construction. Since the inverted arch primary support end head mold positioning device has a wide range of applicability, the inverted arch excavation control fixture is also suitable for tunnel construction of different scales and types, improving the versatility and flexibility of construction equipment.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A positioning device for the initial support end mold of an inverted arch, characterized in that: include: A pair of side molds (100), wherein the pair of side molds (100) are arranged at intervals along the width direction of the tunnel; A transverse mold (102), wherein two ends of the transverse mold (102) are connected between a pair of side molds (100); The filling end mold (104) is arranged below the transverse mold (102), and a hinge (106) is arranged on the filling end mold (104) along the width direction of the filling end mold (104).

2. The inverted arch primary support end mold positioning device according to claim 1, characterized in that: The filling end mold (104) comprises: A vertical rib (108), the top end of which is connected to the transverse mold (102), and the hinge (106) is arranged on the vertical rib (108); An inverted arch mold (110), the inverted arch mold (110) is adapted to the shape of the inverted arch and is connected to the bottom of the vertical rib (108).

3. The inverted arch primary support end mold positioning device according to claim 2, characterized in that: There are a plurality of vertical ribs (108), and the plurality of vertical ribs (108) are arranged at intervals along the length direction of the transverse mold (102); The filling end mold (104) further comprises an end mold plate (112), wherein the end mold plate (112) is arranged between two adjacent vertical ribs (108).

4. The inverted arch primary support end mold positioning device according to claim 3, characterized in that: The transverse mold (102) includes a plurality of segmented molds, two adjacent segmented molds are hinged, and the hinge point of the two adjacent segmented molds corresponds to the position of the vertical rib (108) provided with the hinge (106).

5. The inverted arch primary support end mold positioning device according to claim 2, characterized in that: The inverted arch form (110) comprises a steel plate, and along the length direction of the tunnel, the width of the steel plate is at least 50 mm and the thickness is at least 5 mm.

6. The inverted arch primary support end mold positioning device according to claim 5, characterized in that: The side formwork (100) comprises a square steel pipe, and the width of the square steel pipe along the length direction of the tunnel is at least 30 mm.

7. The inverted arch primary support end mold positioning device according to claim 6, characterized in that: The center line of the square steel tube coincides with the center line of the steel plate.

8. The inverted arch primary support end mold positioning device according to any one of claims 1 to 7, characterized in that: The transverse mold (102) is provided with a hanging ring (114).

9. The inverted arch primary support end mold positioning device according to any one of claims 1 to 7, characterized in that: A pair of the side molds (100), the transverse mold (102) and the filling end mold (104) are connected by welding.

10. An invert excavation control fixture, characterized in that: It comprises the positioning device for the initial support end mold of the inverted arch as described in any one of claims 1 to 9.

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