Shield launching stage forming segment

Abstract

The utility model relates to a shield launching stage forming segment, and relates to the technical field of shield construction, the shield launching stage forming segment comprises a launching bracket arranged in a tunnel and a plurality of coaxially arranged annular segments, a reaction frame is arranged at a tunnel portal, a reference ring is fixedly connected to the side, facing the interior of the tunnel, of the reaction frame, and the reference ring and the annular segments are coaxially arranged; a plurality of positioning plates are arranged between the annular duct piece close to one side of the reference ring and the reference ring, the positioning plates are arranged around the circumferential surface of the reference ring, first fixing assemblies used for fixing the positioning plates between the annular duct piece and the reference ring are arranged on the positioning plates, and second fixing assemblies are arranged between every two adjacent reference rings; and the same calibration channel steel is arranged among the multiple annular pipe pieces, third fixing assemblies used for fixing the calibration channel steel to the multiple annular pipe pieces are arranged between the calibration channel steel and the annular pipe pieces, and connecting assemblies used for connecting the annular pipe pieces and the tunnel are arranged between the annular pipe pieces and the tunnel. The method has the effect that the annular duct piece in the shield launching stage is kept in the true circle state as much as possible.

Description

Technical Field

[0001] The present application relates to the field of shield construction technology, and more particularly to a shield tunneling segment formed at the initial stage. Background Art

[0002] At present, shield technology is generally used in the construction of tunnels in subway projects, among which the quality control of tunnel lining segment forming is an important part of shield construction. When the shield starts, the shield machine jack supports the negative ring segment to provide reaction force, so that the shield machine moves forward. At the same time, the negative ring segment also plays a key role in adjusting the shield starting posture and positioning the positive ring segment. The true roundness of the first ring of negative ring segments assembled into a ring directly affects the positioning of the next ring of negative ring segments. The assembly and connection of the negative second ring segment will cause assembly errors for the subsequent ring segments, until it accumulates to the positive ring segment assembly, causing a large misalignment, which directly affects the visual quality of the formed segments at the initial stage of the shield.

[0003] Referring to a negative ring segment with improved roundness and its use method with publication number CN116464473A, the patent leaves a certain distance between the shield tail of the shield machine and the reference ring of the reaction frame, and each steel segment is directly pinned to the reference ring of the reaction frame to assemble into a whole ring segment, so as to avoid the steel segment from slipping out of the shield tail and deforming again after the shield tail of the shield machine is assembled, and eliminate the deformation of each piece in the process of assembling into a ring, and then the shield machine propulsion cylinder pushes the whole ring of steel segments forward, so that the assembly roundness of the negative ring steel segment matches the roundness of the reference ring, and finally ensures the overall assembly roundness effect of the negative ring and positive ring segments. The patent ensures the visual quality of the true roundness of the whole ring of the segment by assembling the negative ring with steel segments as a whole, but at the same time, the cost of the positive ring steel segment is about 10 times that of ordinary concrete segments, and the economic practicality is extremely low, which is not conducive to the promotion and application of the industry. Summary of the invention

[0004] In order to keep the ordinary concrete segments in the initial stage of shield tunneling in a truly round state as much as possible, the present application provides a formed segment in the initial stage of shield tunneling.

[0005] The shield tunneling segment forming method provided in this application adopts the following technical solution:

[0006] A shield tunneling starting stage forming segment comprises a starting bracket placed in a tunnel and a plurality of coaxially arranged annular segments, a reaction frame is provided at the tunnel entrance, the reaction frame is fixedly connected to the starting bracket, a reference ring is fixedly connected to the reaction frame on the side facing the inside of the tunnel, the reference ring is coaxially arranged with the annular segment, a plurality of positioning plates are provided between the annular segment on the side close to the reference ring and the reference ring, the positioning plates are arranged around the circumference of the reference ring, a first fixing component for fixing the positioning plate between the annular segment and the reference ring is provided on the positioning plate, a second fixing component is provided between two adjacent reference rings, the same calibration channel steel is provided between the plurality of annular segments, the calibration channel steel is parallel to the axis of the annular segment, a third fixing component for fixing the calibration channel steel on the plurality of annular segments is provided between the calibration channel steel and the annular segment, and a connecting component for connecting the annular segment and the tunnel is provided between the annular segment and the tunnel.

[0007] By adopting the above technical scheme, the starting bracket and the reaction frame can be accurately positioned and fixed before the shield enters the tunnel, the elevation and axis of the shield starting to enter the tunnel can be determined, and the axis of the reference ring can be parallel to the axis of the shield tunnel. Then, when installing the annular segment, the annular segment close to the reference ring is pressed against the reference ring, and then the inner arc surfaces of the two are placed in the same plane through the positioning plate, and then the positioning plate is fixed at the connection between the two through the first fixing component, so that the axis of the annular segment coincides with the axis of the reference ring. Then, the annular segment is fixed in the tunnel through the connecting component, and then the annular segment is installed, so that two adjacent annular segments are fixed through the second fixing component, and multiple annular segments are calibrated through the calibration channel steel, so that the axes of multiple annular segments coincide. In this way, while taking into account economic practicality, the error during the installation of the annular segment can be reduced, the occurrence of misalignment can be reduced, and the annular segment in the initial stage of the shield can be kept in a true round state as much as possible.

[0008] Optionally, the first fixing assembly includes two fixing bolts threadedly connected to the positioning plate, one of the fixing bolts is threadedly connected to the reference ring, and the other fixing bolt is threadedly connected to the inner arc surface of the annular segment.

[0009] By adopting the above technical solution, the fixing bolts can be rotated to quickly and flexibly fix or remove the positioning plate on the positioning plate and the annular pipe segment.

[0010] Optionally, the second fixing assembly includes a plurality of fixing plates arranged around the axis of the annular segment, a plurality of grooves are opened on the annular segment, the grooves are equidistantly arranged along the inner wall of the annular segment, the fixing plate is placed between two adjacent annular segments, the end of the fixing plate extends into the groove and is placed in the groove, segment bolts are provided in the groove, the segment bolts pass through the fixing plate and are threadedly connected in the groove.

[0011] By adopting the above technical solution, two adjacent annular segments can be connected by a fixing plate, and the fixing plate can be fixed by rotating the segment bolts.

[0012] Optionally, the third fixing assembly includes a plurality of positioning bolts, which pass through the calibration channel steel and are threadedly connected to the inner wall of the annular segment.

[0013] By adopting the above technical solution, the positioning screw can be fixed to the calibration channel steel part by rotating the positioning bolt.

[0014] Optionally, the connection assembly includes a plurality of connection bolts, a plurality of connection grooves are formed on the inner arc surface of the annular segment, the connection bolts correspond to the connection grooves one by one, and the connection bolts pass through the connection grooves and are threadedly connected to the inner wall of the tunnel.

[0015] By adopting the above technical solution, the annular segment can be fixed on the inner wall of the tunnel by connecting the bolt pairs.

[0016] Optionally, a plurality of square timbers are abutted between the annular segment and the bottom end of the tunnel.

[0017] By adopting the above technical solution, the setting of square timber can support and buffer the annular segments, reducing the possibility of direct contact between the annular segments and the bottom of the tunnel when the annular segments sink.

[0018] Optionally, a tensioning device for tightening the outer side of the annular segment as a whole is provided on the outer wall of the annular segment.

[0019] By adopting the above technical solution, the tensioning device can further improve the stability of the annular segment.

[0020] Optionally, the knot-tying device includes a steel wire rope arranged around the outer side of the annular tube wall, and the end of the steel wire rope is fixedly connected to the starting bracket.

[0021] By adopting the above technical solution, the annular segment is connected to the starting bracket by a steel wire rope, so that the annular segment can be effectively tightened.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. It can reduce the error in the installation of the annular segments and the occurrence of misalignment while taking into account economic practicability, so that the annular segments at the initial stage of the shield machine can be kept in a true round state as much as possible;

[0024] 2. The setting of square timber can support and buffer the annular segments, reducing the possibility of direct contact with the bottom of the tunnel when the annular segments sink;

[0025] 3. The tie-tying device can further improve the stability of the annular segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram of a second fixing assembly in an embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of a knot-tying device according to an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the structure of the square timber in the embodiment of the present application.

[0030] In the figure, 1, starting bracket; 2, annular segment; 21, groove; 22, connecting groove; 3, reaction frame; 31, reference ring; 4, positioning plate; 41, first fixing assembly; 411, fixing bolt; 5, second fixing assembly; 51, fixing plate; 52, segment bolt; 6, calibration channel steel; 61, third fixing assembly; 611, positioning bolt; 7, square timber; 8, tensioning device; 81, wire rope; 9, connecting assembly; 91, connecting bolt. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0032] The embodiment of the present application is: a shield tunneling initial stage forming segment, referring to Figure 1 , an initial bracket 1 is installed in the tunnel. The initial bracket 1 is made of steel structure and has sufficient strength and stability.

[0033] A reaction frame 3 is provided at the tunnel entrance, and the reaction frame 3 is fixedly connected to the starting bracket 1 to provide sufficient support force. A reference ring 31 is fixedly installed on the side of the reaction frame 3 facing the inside of the tunnel, and the axis of the reference ring 31 coincides with the axis of the tunnel shield starting to enter the hole. A plurality of coaxially arranged annular segments 2 are provided in the tunnel, and the reference ring 31 is coaxially arranged with the annular segment 2.

[0034] Among the multiple annular segments 2, multiple positioning plates 4 are provided between the annular segment 2 close to the reference ring 31 and the reference ring 31. The positioning plates 4 are equidistantly arranged around the axis of the reference ring 31, and the positioning plates 4 are arranged along the circumferential surface of the reference ring 31. The positioning plates 4 are placed at the connection between the annular segment 2 and the reference ring 31.

[0035] Each positioning plate 4 is provided with a first fixing assembly 41, which includes two fixing bolts 411 threadedly connected to the positioning plate 4, and the fixing bolts 411 are respectively located at both ends of the positioning plate 4, one of the fixing bolts 411 passes through the positioning plate 4 and is threadedly connected to the reference ring 31, and the other fixing bolt 411 passes through the positioning plate 4 and is threadedly connected to the inner arc surface of the annular segment 2. Thus, by rotating the two fixing bolts 411, the positioning plate 4 can be fixed between the annular segment 2 and the reference ring 31. In this way, the reference ring 31 is coaxially arranged with the annular segment 2.

[0036] Reference Figure 1 and Figure 2 A second fixing assembly 5 is provided between two adjacent reference rings 31, and the second fixing assembly 5 includes a plurality of fixing plates 51 arranged around the axis of the annular segment 2. A plurality of grooves 21 are provided on the inner arc surface of each annular segment 2, and the grooves 21 are arranged equidistantly along the inner wall of the annular segment 2. The fixing plate 51 is placed between two adjacent annular segments 2, and its end extends into the groove 21 and is placed in the groove 21. A segment bolt 52 is provided in the groove 21, and the segment bolt 52 passes through the fixing plate 51 and is threadedly connected in the groove 21.

[0037] Therefore, by tightening the segment bolts 52 , the fixing plate 51 can be fixed at the connection between two adjacent annular segments 2 , thereby firmly connecting the two adjacent annular segments 2 together, and under the restriction of the fixing plate 51 , the two annular segments 2 can be coaxially arranged.

[0038] In order to further improve the stability of the annular segment 2 and the accuracy of the position of the annular segment 2, a common calibration channel steel 6 is provided between the multiple annular segments 2, and the length of the calibration channel steel 6 is greater than the width of the superimposed two annular segments 2. The length direction of the calibration channel steel 6 is parallel to the axis of the annular segment 2, and a third fixing assembly 61 is provided between the calibration channel steel 6 and the annular segment 2.

[0039] The third fixing assembly 61 includes a plurality of positioning bolts 611, which pass through the channel steel and are threadedly connected to the inner wall of the annular segment 2. The calibration channel steel 6 can be firmly fixed to the annular segment 2 by tightening the positioning bolts 611.

[0040] A connection assembly 9 is provided between the annular segment 2 and the tunnel, and the connection assembly 9 includes a plurality of connection bolts 91. A plurality of connection grooves 22 are provided on the inner arc surface of each annular segment 2, and the connection bolts 91 correspond to the connection grooves 22 one by one and are placed in the connection grooves 22. The connection bolts 91 pass through the connection grooves 22 and are threadedly connected to the inner wall of the tunnel. A concrete layer is filled between the outer arc surface of the annular segment 2 and the inner wall of the tunnel.

[0041] Then, by tightening the connecting bolts 91, the annular segment 2 can be firmly connected to the inner wall of the tunnel.

[0042] Reference Figure 3 and Figure 4 The annular segment 2 is abutted against the square wood 7 at the bottom of the tunnel, and the setting of the square wood 7 can play a supporting and buffering role. At the same time, a tie-tying device 8 is set on the outer wall of the annular segment 2, and the tie-tying device 8 includes a steel wire rope 81 set around the outer side of the annular pipe wall. The steel wire rope 81 is set in multiple pieces, and the ends of the steel wire rope 81 are fixedly connected to the starting bracket 1. Thus, the annular segment 2 is connected to the starting bracket 1 through the steel wire rope 81, so that the annular segment 2 is effectively tightened, and the stability of the annular segment 2 is further improved.

[0043] The implementation principle of the embodiment of the present application is as follows: the starting bracket 1 and the reaction frame 3 can be accurately positioned and fixed before the shield enters the tunnel, the elevation and axis of the shield starting to enter the tunnel can be determined, and the axis of the reference ring 31 can be parallel to the axis of the shield tunnel. Then, when installing the annular segment 2, the annular segment 2 close to the reference ring 31 is pressed against the reference ring 31, and then the inner arc surfaces of the two are placed in the same plane through the positioning plate 4, and the annular segment 2 is supported by the square wood 7 and tightened by the wire rope 81. Then, the positioning plate 4 is fixed to the connection between the two by the positioning plate 4 and the fixing bolts 411, so that the axis of the annular segment 2 coincides with the axis of the reference ring 31. Then, the annular segment 2 is fixed in the tunnel by rotating the connecting piece, and concrete is filled between the annular segment 2 and the tunnel. Then, the annular segments 2 are installed so that two adjacent annular segments 2 are fixed by the fixing plates 51 and the segment bolts 52 , and multiple annular segments 2 are calibrated by the calibration channel steels 6 so that the axes of the multiple annular segments 2 coincide with each other.

[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shield tunneling starting stage forming segment, comprising a starting bracket (1) placed in a tunnel and a plurality of coaxially arranged annular segments (2), characterized in that: A reaction frame (3) is provided at the tunnel entrance, the reaction frame (3) being fixedly connected to the starting bracket (1), a reference ring (31) being fixedly connected to the side of the reaction frame (3) facing the inside of the tunnel, the reference ring (31) being coaxially arranged with the annular segment (2), a plurality of positioning plates (4) being arranged between the annular segment (2) and the reference ring (31) on the side close to the reference ring (31), the positioning plates (4) being arranged around the circumference of the reference ring (31), and the positioning plates (4) being provided with a fixing member for fixing the positioning plate (4) to the annular segment (2) and A first fixing assembly (41) is provided between the reference rings (31); a second fixing assembly (5) is provided between two adjacent reference rings (31); a same calibration channel steel (6) is provided between a plurality of annular segments (2); the calibration channel steel (6) is parallel to the axis of the annular segment (2); a third fixing assembly (61) is provided between the calibration channel steel (6) and the annular segment (2) for fixing the calibration channel steel (6) to the plurality of annular segments (2); and a connecting assembly (9) is provided between the annular segment (2) and the tunnel for connecting the two.

2. The shield tunneling initial stage forming segment according to claim 1, characterized in that: The first fixing assembly (41) comprises two fixing bolts (411) threadedly connected to the positioning plate (4), wherein one of the fixing bolts (411) is threadedly connected to the reference ring (31), and the other fixing bolt (411) is threadedly connected to the inner arc surface of the annular segment (2).

3. The shield tunneling initial stage forming segment according to claim 1, characterized in that: The second fixing assembly (5) comprises a plurality of fixing plates (51) arranged around the axis of the annular segment (2), the annular segment (2) being provided with a plurality of grooves (21), the grooves (21) being arranged equidistantly along the inner wall of the annular segment (2), the fixing plate (51) being arranged between two adjacent annular segments (2), the end of the fixing plate (51) extending into the groove (21) and being arranged in the groove (21), the groove (21) being provided with a segment bolt (52), the segment bolt (52) passing through the fixing plate (51) and being threadedly connected in the groove (21).

4. The shield tunneling initial stage forming segment according to claim 1, characterized in that: The third fixing assembly (61) comprises a plurality of positioning bolts (611), wherein the positioning bolts (611) pass through the marking channel steel (6) and are threadedly connected to the inner wall of the annular segment (2).

5. The shield tunneling initial stage forming segment according to claim 1, characterized in that: The connection assembly (9) comprises a plurality of connection bolts (91), a plurality of connection grooves (22) are provided on the inner arc surface of the annular segment (2), the connection bolts (91) correspond to the connection grooves (22) one by one, and the connection bolts (91) pass through the connection grooves (22) and are threadedly connected to the inner wall of the tunnel.

6. The shield tunneling initial stage forming segment according to claim 1, characterized in that: A plurality of square timbers (7) are abutted between the annular segment (2) and the bottom end of the tunnel.

7. The shield tunneling initial stage forming segment according to claim 1, characterized in that: A tensioning device (8) for tightening the outer side of the annular segment (2) as a whole is provided on the outer wall of the annular segment (2).

8. The shield tunneling initial stage forming segment according to claim 7, characterized in that: The knot-tying device (8) comprises a steel wire rope (81) arranged around the outside of the annular tube wall, and the end of the steel wire rope (81) is fixedly connected to the starting bracket (1).

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