CN219197335U - Pushing system for tunneling construction of T-shaped connecting channels of tunnel group - Google Patents

Abstract

The utility model provides a pushing system for tunneling construction of a T-shaped connecting channel of a tunnel group, which comprises a reaction frame and a first force transmission component. The reaction frame is used for providing support for the tunneling equipment in the tunneling direction. The first force transfer member connects the reaction frame to the main tunnel segment on the side of the reaction frame facing away from the connection channel, and the supporting force acting on the reaction frame is transferred via the first force transfer member to the main tunnel segment. One side of the reaction frame, which is far away from the connecting channel, is provided with a passing space along the extending direction of the main tunnel. According to this scheme, the rear side of pushing away the reaction frame of system is provided with the space of passing, can allow vehicle, personnel, material etc. to can utilize the space that is located reaction frame and deviates from contact channel one side to shift material, personnel etc. between the different positions in main tunnel, make multiple construction process can go on in step. And in particular, the construction of a plurality of connecting channels can be simultaneously carried out at different positions of the finished main tunnel, and the construction period can be greatly shortened.

Description

Pushing system for tunneling construction of T-shaped connecting channels of tunnel group

Technical Field

The utility model relates to the technical field of underground engineering, in particular to a pushing system for tunneling construction of a T-shaped connecting channel of a tunnel group.

Background

According to the specification of subway design specification: and a communication channel is arranged between the two single-line interval tunnels when the continuous length of the tunnels is more than 600 m. The communication channels of subway tunnels and municipal highway tunnels are mostly adopting a mining method. For example, in an area with abundant groundwater, the area is usually reinforced by adopting a freezing method, and then the communication channel is excavated by adopting a mining method. However, the construction of the freezing method is easy to cause bad consequences such as frost heaving, thawing sinking and the like, a certain ground subsidence is usually caused, and even the danger of collapse occurs when the ground subsidence is large, which is particularly difficult to adapt to urban core areas with complex geological conditions and high environmental protection requirements. The construction method has long construction period, usually needs over 100 days of freezing, and then can start excavation, so that the construction period is often 4-6 months. In addition, for the stratum with sand layers and pressure-bearing water, the freezing method has poor effect, is easy to cause accidents, has great influence on environment and has high risk.

In recent years, a method of constructing a connecting channel by adopting an assembled connecting channel structure and adopting a mechanical method is proposed. In the starting process, the pre-supporting trolley is required to be opened and supported on the main tunnel duct piece in the upper, lower, left and right directions to form a full-ring integral pre-supporting structure, and the reaction frame is supported on the main tunnel duct piece on the opposite side of the starting direction to bear thrust as the back rest of the pushing device. Taking subway tunnel construction as an example, the tunnel inside diameter is typically 5.5m to 6m, and in some projects can be even expanded to 8.1m or more. For tunnel construction operations of other projects, the inside diameter of the tunnel may be large or small. While current pre-support structures are able to accommodate tunnel inner diameter requirements varying between 5.5m and 7.1 m. When the tunnel diameter is greater than 7.1m, for example, up to 8.1m, the same support means will result in a very bulky system of pre-support structures. And as the diameter of the tunnel is increased, the adaptability and stability of the main tunnel segment structure and the supporting structure, and the stress change, the structural strength and the like in the construction process are required to be researched again. The current construction method does not provide any reference.

In particular, the supporting forces for supporting the driving device ultimately act on the main tunnel segment via the supporting structure. And because the structural strength of the main tunnel segment is limited, when the supporting force required by tunneling equipment is overlarge, the requirement is often difficult to meet, and the structural damage of the main tunnel segment can be caused by the forcibly increased supporting force, so that the structural safety of the whole tunnel is adversely affected.

In addition, by adopting the whole-ring integral type pre-supporting structure, the space of the whole main tunnel is occupied by the pre-supporting structure, vehicles cannot pass, and two sides of a construction position cannot be communicated. This results in that the construction of other connection channels or the other construction of the main tunnel can be performed only after the construction of one connection channel is completed, and a plurality of construction processes cannot be performed simultaneously, resulting in an extension of the construction progress.

Accordingly, there is a need to provide a jacking system for use in connection with tunneling construction that at least partially addresses the above-described problems while achieving intensification and refinement of the equipment system.

Disclosure of Invention

The utility model aims to provide a pushing system for tunneling construction of a T-shaped connecting channel of a tunnel group, so that the tunneling equipment is provided with a supporting force as large as possible on the premise of ensuring the safety of a main tunnel structure, synchronous construction of various procedures is realized, the construction efficiency is improved, the construction period is shortened, and the integral intensification and the precision of the pushing system are further realized.

According to one aspect of the utility model, the pushing system comprises:

the reaction frame is used for providing support for tunneling equipment in the tunneling direction; and

a first force transfer member connecting the reaction frame to a main tunnel segment located on a side of the reaction frame facing away from the connection channel, a supporting force acting on the reaction frame being transferred to the main tunnel segment via the first force transfer member;

one side of the reaction frame, which is away from the communication channel, is provided with a passing space along the extending direction of the main tunnel.

In some embodiments, the first force transfer member comprises a plurality of support rods distributed about the axis of the communication channel, the plurality of support rods comprising an upper support rod portion and a lower support rod portion, the passage space being disposed between the upper support rod portion and the lower support rod portion.

In some embodiments, the pushing system further comprises a platform having a surface that is capable of conforming in shape to the primary tunnel segment, the support bar being connected to the platform and supported on the primary tunnel segment by the platform.

In some embodiments, the support rod includes at least two subsections disposed along a length direction, and adjacent subsections are detachably connected and fixed through connectors.

In some embodiments, the first force transfer member is configured as an unpowered force transfer member and has a fixed length, and the ejection system further comprises an ejection drive unit provided at a side of the reaction frame facing the communication channel.

In some embodiments, a traffic platform is laid in the traffic space.

In some embodiments, the traffic platform is provided with a traffic track along the extension direction of the main tunnel.

In some embodiments, the pushing system further comprises an operating platform mounted on the main tunnel segment below the pushing system.

In some embodiments, the pushing system further comprises a second force transfer member connecting the reaction frame to a main tunnel segment surrounding the originating end of the communication channel, the supporting force acting on the reaction frame being transferred to the main tunnel segment via the first force transfer member and the second force transfer member.

In some embodiments, the pushing system further comprises an originating sleeve connected to the primary tunnel segment, the second force transfer member connected to the originating sleeve; alternatively, the second force transfer member is directly connected to the primary tunnel segment.

The pushing system and the construction method using the pushing system have the following beneficial technical effects:

the rear side of the reaction frame of the pushing system is provided with a passing space which can allow vehicles, personnel, materials and the like to pass through, so that the space on one side of the reaction frame, which is away from the connecting channel, can be utilized to transfer the materials, the personnel and the like between different positions of the main tunnel, and various construction procedures can be synchronously carried out. And in particular, the construction of a plurality of connecting channels can be simultaneously carried out at different positions of the finished main tunnel, and the construction period can be greatly shortened.

In some embodiments, the reaction frame of the pushing system is respectively connected with the main tunnel segment through the front and rear force transfer components, so that on one hand, the local stress of the main tunnel segment can be dispersed when a small supporting force is provided, and the structural safety of the main tunnel segment is better; on the other hand, a higher upper limit of supporting force can be provided under the condition of ensuring the safety of the main tunnel segment structure.

Drawings

For a better understanding of the above and other objects, features, advantages and functions of the present utility model, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. It will be appreciated by persons skilled in the art that the drawings are intended to schematically illustrate preferred embodiments of the utility model, and that the scope of the utility model is not limited in any way by the drawings, and that the various components are not drawn to scale. Wherein, the liquid crystal display device comprises a liquid crystal display device,

FIG. 1 is a perspective view of a pusher system according to a preferred embodiment of the present utility model;

FIG. 2 is a side view of the pusher system shown in FIG. 1;

FIG. 3 is a side view of a pusher system according to another preferred embodiment of the present utility model;

FIG. 4 is a force analysis model of the primary tunnel segment and the connecting channel aperture ring with only the force transfer member on the side of the reaction frame facing the connecting channel; and

fig. 5 and 6 are respectively the results of the force analysis of the main tunnel segment and the connecting channel opening ring under the condition shown in fig. 4 under different pushing pressures.

Detailed Description

Specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are intended to fall within the scope of the utility model as well.

In order to realize the intercommunication of underground space networks, a large number of T-shaped connecting tunnels are required to be constructed. Such as: subway, highway section communication channel, subway access & exit and wind shaft, municipal administration piping lane examine workover, long tunnel middle wind shaft, water service tunnel connecting wire etc.. The utility model provides a pushing system suitable for tunnel group T-shaped connection channel construction by a mechanical method. The connecting channel can be an assembled connecting channel formed by assembled units such as duct pieces or pipe joints. The communication channel can be used for communicating two subway main tunnels.

As shown in fig. 1 and 2, a pushing system 10 according to a preferred embodiment comprises a reaction frame 11 and a first force transfer member 12. During the construction of the mechanical communication channel, the pushing system 10 is fixed in the main tunnel 1 at a position corresponding to the communication channel to be tunneled. The reaction frame 11 is used to provide support for the ripping apparatus. In order to meet the supporting effect on the driving device, the reaction frame 11 is made of a rigid material, such as steel or a composite material. The reaction frame 11 has a size adapted to the size of the tunneling apparatus used for excavating the communication channel, and has a rigidity set so as to satisfy the requirement of deformation resistance in the pushing tunneling construction. In some embodiments, the reaction frame 11 may be configured in a substantially rectangular shape. Of course, the reaction frame 11 may be configured in a circular shape, a ring shape or any other shape that meets the construction requirements as an alternative embodiment.

The first force transfer member 12 connects the reaction frame 11 to the main tunnel segment such that the supporting forces acting on the reaction frame 11, for example by a tunneling device or other structure, are finally transferred to the main tunnel segment via the first force transfer member 12. Wherein the first force transfer member 12 is arranged at the rear side of the reaction frame 11, i.e. the side facing away from the connection channel, connecting the reaction frame 11 to the main tunnel segment facing the connection channel such that the force supporting the forward tunneling of the tunneling apparatus is provided by the opposite main tunnel segment. It will be appreciated that the first force transfer member 12 is subjected to pressure during the transfer of force.

In some embodiments, the first force-transmitting member 12 may be configured to comprise a plurality of discretely arranged rods, each supported between the reaction frame 11 and the main tunnel segment facing the communication channel. The plurality of rods are arranged generally about the axis of the communication channel to provide a generally evenly distributed support force for the reaction frame 11. The rod constituting the first force transfer member 12 may be referred to herein as a support rod, and may specifically be a steel rod, or other member of sufficient strength, and its structural shape may be flexibly selected as desired. Such a support rod only serves to transfer support force and does not itself provide a driving force and may be referred to as an unpowered support rod, i.e. the first force transfer member 12 is an unpowered force transfer member. The connection mode of the support rods with the reaction frame 11 and the main tunnel segment at two ends can comprise one or a combination of a plurality of welding, bolting, hinging or riveting, etc. Particularly, when the articulated connection mode is adopted, the position of the reaction frame 11 can be finely adjusted relative to the portal of the communication channel, so that the tunneling position and direction are more accurate.

Preferably, the pushing system 10 is further provided with a bearing platform 123 having a larger size and being arranged towards the side of the main tunnel segment in a shape that can conform to the inner surface of the main tunnel segment, such as a convex cambered surface. The support bar of the first force transfer member 12 is connected to a platform 123, which interacts with the main tunnel segment in a supporting or abutting manner through the platform 123. The abutment 123 may increase the contact area with the primary tunnel segment and reduce the local pressure acting on the primary tunnel segment. To ensure sufficient strength, the bearing platform 123 may be a steel structure. In other embodiments, the bearing platform 123 may also be a structure integrally provided on the main tunnel segment, such as a prefabricated reinforced concrete structure or the like. Alternatively, the bearing platform 123 may be omitted and a steel structure may be embedded in the main tunnel segment, to which the first force transfer member 12 is attached or supported.

Although not shown in the drawings, in some embodiments the first force transfer member 12 may also be constructed in the form of a single member, such as a cylindrical structure or the like with its axial ends connected to the reaction frame and the main tunnel segment, respectively. The construction mode can reduce the number of parts, so that the installation procedure and time are reduced, and error accumulation can be effectively reduced compared with the connection through a plurality of scattered support rods. Preferably, the tubular structure may be provided with material transport apertures extending radially therethrough to facilitate transport of material.

In further embodiments, the first force transfer member 12 may also be configured as a device capable of providing a driving force, such as a pressure cylinder or the like driven by air pressure or hydraulic pressure, in particular a hydraulic cylinder, and may thus be referred to as a powered force transfer member. The connection and arrangement of the powered force transfer members may be substantially the same as the unpowered force transfer members.

It will be appreciated that when the first force transfer member 12 is an unpowered force transfer member it has a fixed length, i.e. the position of the reaction frame 11 in the direction of the heading is fixed. Preferably, the side of the reaction frame 11 facing the communication channel may be provided with a push drive unit 14. In some embodiments, the ejector drive unit 14 may include a hydraulic or pneumatic pressure cylinder.

Preferably, the ejector drive unit 14 comprises a plurality of hydraulic cylinders arranged in a quadrant-symmetrical manner about the central axis of the communication channel so as to provide a uniform driving force to the ripping apparatus in the circumferential direction. By controlling the strokes of the hydraulic cylinders in different positions, the pushing drive unit 14 can also adjust the angle of the tunneling direction of the tunneling apparatus relative to the central axis of the communication channel so as to make the tunneling direction coincide with the central axis or meet the requirements of other angle adjustment. In addition, when the tunneling device is a shield tunneling machine, the tunneling device does not need to be provided with driving force by the pushing system. At this time, the jack drive unit 14 serves only as an angle adjustment unit, and since it is not necessary to provide a very large driving force, a smaller size and specification of hydraulic cylinder can be selected accordingly. Further, it is also possible to provide abutments (not shown) which are each connected to an end of the hydraulic cylinder facing away from the reaction frame 11. The pushing driving unit 14 is abutted with the pipe piece of the tunneling equipment or the communication channel through an abutting piece. In some embodiments, the abutment may specifically be an annular top iron.

In order to achieve an intensification of the system, the drive cylinders of the pusher drive unit 14 are at least partially integrated in the interior of the reaction frame 11. On the one hand, the pushing driving unit 14 and the reaction frame 11 can be formed into an integral structure, and then are hoisted to the construction site after being assembled outside the construction site, so that the trouble of assembling on a relatively narrow construction site is avoided, and the intensification of equipment facilities is realized. On the other hand, the reaction frame 11 can also protect parts such as pipelines of the pushing driving unit 14, and the like, so that the possibility of damage caused by the complex environment of a construction site is reduced.

Furthermore, it will be appreciated that when the primary tunnel diameter is large (e.g. 8.0m and above), the reaction frame 11 is further from the primary tunnel segment, so that the overall length of the first force transfer member 12 is also large. Of course, the length of the first force-transmitting member 12 can be predetermined by calculation or measurement or the like at the time of engineering design such that it is connected from the reaction frame 11 to the main tunnel segment in the length direction and with a single member having a fixed length. Preferably, in a further embodiment, the first force transfer member 12 may also be provided as a split structure comprising two or more sub-segments in the length direction, the sub-segments being secured by a connector connection between adjacent sub-segments in the length direction. In this way, the length of the first force transfer member 12 can be flexibly adjusted according to the actual situation at the construction site, which is very advantageous when the installation error of the pushing system is large. In addition, the smaller length of the individual sub-sections of the first force transfer member 12 may also reduce difficulties in removal, storage and transportation.

In order to make full use of this space between the reaction frame 11 and the main tunnel segment, according to the technical solution of the present utility model, a passage space 15 may be provided for the first force transfer member 12 to allow vehicles, personnel, materials, etc. to pass through, so that the space on the side of the reaction frame 11 facing away from the connection channel may be used to transfer materials, personnel, etc. between different positions of the main tunnel, so that various construction processes may be performed simultaneously. And in particular, the construction of a plurality of connecting channels can be simultaneously carried out at different positions of the finished main tunnel, and the construction period can be greatly shortened. Preferably, the maximum distance between the side of the reaction frame facing away from the connecting channel and the segment wall of the main tunnel may be set to be not less than one third of the radial dimension of the main tunnel, so as to ensure that the passage space has a sufficient dimension for passage. The maximum distance of the traffic space can even be set to be not less than one half of the radial dimension of the main tunnel when the diameter of the main tunnel is large.

In the illustrated embodiment, the plurality of support rods includes an upper support rod portion 121 and a lower support rod portion 122 that are spaced apart in the up-down direction, leaving sufficient space to form the pass space 15. The effect that the pushing system does not influence the passing is achieved in this way. Preferably, a passing platform 151 is provided in the passing space to provide support for passing vehicles, personnel, materials, etc. The pass-through deck 151 is laid on the lower support bar portion 122, with upward support provided by the support bars. Further, a passage rail 152 along the extending direction of the main tunnel may be further provided on the passage platform 151. In this manner, the pass-through track 152 may provide guidance for vehicle movement, thereby improving pass-through efficiency. In addition, in embodiments in which the first force-transmitting component 12 is configured as a tubular structure, it is also possible to use the material-conveying opening as a passage space.

Further, the pushing system 10 further includes a working platform 16, which is erected on the main tunnel segment below the pushing system 10, and provides an integral supporting function for the structures such as the reaction frame 11. By the support of the working platform 16, on one hand, the tunneling equipment is aligned with the position of the communication channel to be tunneled, and on the other hand, the working surface of pushing operation is lifted to the horizontal position with larger radial dimension in the main tunnel, so that a spacious working environment can be provided.

Fig. 3 shows a pusher system 20 according to another preferred embodiment of the present utility model having a construction substantially identical to that of the pusher system 10 shown in fig. 1 and 2, wherein like structures are given like reference numerals. The difference is that the pushing system 20 shown in fig. 3 is also provided with a second force transfer member 17. The second force-transmitting member 17 is arranged on the front side of the reaction frame 11, i.e. the side facing the connection channel, connecting the reaction frame 11 to the corresponding segment of the main tunnel 1 surrounding the originating end of the connection channel, such that the force supporting the forward tunneling device is provided jointly by the main tunnel segments on both the front and rear sides of the reaction frame 11, i.e. partly by the main tunnel segments on the same side as the connection channel and partly by the main tunnel segments on the opposite side of the connection channel. It will be appreciated that the second force transfer member 17 is subjected to a tensile force during the provision of the supporting force.

Fig. 4 shows a force analysis model of the main tunnel segment and the contact channel aperture door ring with the presence of only the second force transfer member 17 (i.e. omitting the first force transfer member, the supporting force of the reaction frame 11 being provided entirely by the main tunnel segment on the same side as the contact channel). Fig. 5 and fig. 6 respectively show the results of the stress analysis of the main tunnel segment and the connecting channel hole door ring under different pushing pressures. And excavating a connecting channel with the diameter of R2 on the main tunnel duct piece by taking the diameter of the main tunnel duct piece as R1, and analyzing the stress of the main tunnel duct piece and the door ring forming the connecting channel. The results show that, in the case where the supporting force of the reaction frame 11 is provided entirely by the main tunnel segment on the same side as the connecting channel, the locally concentrated stress of the main tunnel segment connected to the second force transfer member 17 is up to 10 to 20MPa and is concentrated mainly at the periphery of the force transfer member, it can be handled by locally reinforcing the periphery of the second force transfer member 17. Under the action of 250-450 kPa pushing distribution force, the maximum horizontal lateral displacement of the opening position of the communication channel reaches-1.0 to-1.5 mm, and the horizontal inward convergence trend has less influence on the uncut whole ring of the adjacent main tunnel segment. Specifically, taking R1 as 8.1m and R2 as 3.65m as an example, referring to fig. 5 and 6, it can be seen that the maximum displacement deformation of the main tunnel segment becomes-1.2 mm and the maximum displacement deformation of the aperture ring forming the communication passage becomes-1.2 mm when bearing the top thrust of 450kPa at the maximum.

In general, in the construction environment of large diameter tunnels (e.g., 8.0m and above), by adding the second force transfer member 17, the jacking system can provide a jacking force of 450kPa on the basis of the jacking force provided by the first force transfer member 12 while ensuring the safety and stability of the structural stress. Thus, by cooperation of the first force transfer member 12 with the second force transfer member 17, the ejector system is able to provide a greater ejector force.

The specific construction of the second force transfer member 17 may be substantially the same or similar to that of the first force transfer member 12 and will not be described here in detail for the sake of brevity. It will be appreciated that when the second force transfer member 17 is configured in the form of a rod, the rod may be referred to as a pull rod. It should be noted that the first force transfer member 12 and the second force transfer member 17 should be provided as power members capable of telescoping and providing a driving force at the same time, to allow the reaction frame 11 to which they are connected together to be movable forward (i.e. in the direction of the heading) to provide a driving force for the heading equipment. At this point, the first force transfer member 12 is extended providing a supporting force and the second force transfer member 17 is contracted providing a pulling force. Alternatively, the first force-transmitting member 12 and the second force-transmitting member 17 may also be provided as unpowered members, as shown in fig. 3, which have a fixed length, i.e. the position of the reaction frame 11 in the direction of tunneling is fixed.

Preferably, as shown in fig. 3, the pushing system 20 further includes an originating sleeve 13 surrounding the communication channel and fixedly connected to the primary tunnel segment. The fixed connection mode can be pre-buried, welded, bolted, sleeve connection and the like. The end of the second force transfer member 17 facing the communication channel is connected to the originating sleeve 13. In other words, the second force transfer member 17 is indirectly connected to the main tunnel segment through the originating sleeve 13. It will be appreciated that in a further embodiment not shown in the drawings, it is also possible to connect the second force transfer member 17 directly to the corresponding main tunnel segment. Preferably, a steel structure may be provided in the main tunnel segment by pre-burying or the like to increase the structural strength of the main tunnel segment, and the second force transfer member 17 may be connected to the steel structure.

The foregoing description of various embodiments of the utility model has been presented for the purpose of illustration to one of ordinary skill in the relevant art. It is not intended that the utility model be limited to the exact embodiment disclosed or as illustrated. As above, many alternatives and variations of the present utility model will be apparent to those of ordinary skill in the art. Thus, while some alternative embodiments have been specifically described, those of ordinary skill in the art will understand or relatively easily develop other embodiments. The present utility model is intended to embrace all alternatives, modifications and variations of the present utility model described herein and other embodiments that fall within the spirit and scope of the utility model described above.

Claims (10)

1. A pushing system for tunneling construction of a T-shaped communication channel of a tunnel group, the communication channel being used for communicating with at least one main tunnel, the pushing system comprising:

the reaction frame (11), the reaction frame (11) is used for providing support for tunneling equipment in the tunneling direction; and

-a first force transfer member (12) connecting the reaction frame (11) to a main tunnel segment located on a side of the reaction frame (11) facing away from the connection channel, a supporting force acting on the reaction frame (11) being transferred via the first force transfer member to the main tunnel segment;

wherein, the side of reaction frame (11) deviating from the contact passageway is provided with along the traffic space (15) of the extending direction of main tunnel.

2. The pushing system according to claim 1, characterized in that the first force transfer member (12) comprises a plurality of support rods distributed around the axis of the communication channel, the plurality of support rods comprising an upper support rod portion (121) and a lower support rod portion (122), the passage space (15) being arranged between the upper support rod portion (121) and the lower support rod portion (122).

3. The jacking system of claim 2, further comprising a cap (123), the cap (123) having a surface that is shaped to conform to the primary tunnel segment, the support bar being connected to the cap (123) and supported on the primary tunnel segment by the cap (123).

4. The pushing system of claim 2 wherein the support bar comprises at least two subsections disposed along a length, adjacent subsections being detachably connected and secured by a connector.

5. The jacking system according to claim 1, characterized in that the first force transfer member (12) is configured as an unpowered force transfer member and has a fixed length, the jacking system further comprising a jacking drive unit (14) arranged at a side of the reaction frame (11) facing the communication channel.

6. The pushing system according to claim 1, characterized in that a passage platform (151) is laid in the passage space (15).

7. The pushing system according to claim 6, characterized in that the transit platform is provided with transit tracks (152) along the extension direction of the main tunnel.

8. The jacking system of claim 1, further comprising a work platform (16) mounted on the main tunnel segment below the jacking system.

9. The jacking system according to any one of claims 1 to 8, further comprising a second force transfer member (17), said second force transfer member (17) connecting said reaction frame (11) to a main tunnel segment surrounding an originating end of said communication channel, a supporting force acting on said reaction frame (11) being transferred to said main tunnel segment via said first force transfer member (12) and said second force transfer member (17).

10. The jacking system according to claim 9, further comprising an originating sleeve (13), the originating sleeve (13) being connected to the main tunnel segment, the second force transfer member (17) being connected to the originating sleeve (13); alternatively, the second force transfer member (17) is directly connected to the main tunnel segment.

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