A special-shaped steel sleeve, a segment block, a tunnel and a freezing pipe construction method

Abstract

The present application relates to the technical field of shield tunnel civil engineering, and particularly relates to a special-shaped steel sleeve, which comprises a steel sleeve body, a fixed tenon is arranged on the lower end surface of the steel sleeve body in the radial direction, and a blocking connecting ring plate is arranged on the lower end surface of the steel sleeve body in the radial direction outward; a rubber positioning sleeve is composed of a bottom surface and a column body protruding upward in the middle of the bottom surface, and a connecting groove is arranged on the outer edge of the bottom surface; the fixed tenon can be connected with the connecting groove, so that the rubber positioning sleeve can be fixed on the lower end surface of the steel sleeve body; a segment, a tunnel and a freezing pipe construction method are also disclosed. The segment with the pre-buried special-shaped steel sleeve can avoid the damage of the segment reinforcement caused by the deviation of the freezing pipe during construction, and can reliably block the freezing pipe hole after construction, thereby ensuring the safety of metro operation.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology for shield tunnels and pipe jacking tunnels, specifically to a construction method for special-shaped steel casings, pipe segments, tunnels, and frozen pipes. Background Technology

[0002] When the connecting passage between urban subway sections is located in water-rich and soft strata, the soil around the connecting passage is usually temporarily reinforced by freezing before tunnel excavation to ensure the safety of tunnel excavation.

[0003] The existing technology involves directly installing freezing pipes into the steel tunnel segments and the concrete segments on both sides of the steel tunnel segments. After the connecting passage is constructed, the excess freezing pipes at the openings are removed, and a steel plate is added to the inner wall of the segment. The steel plate is then connected to the concrete segment using expansion bolts. This existing method presents two safety hazards: First, the lack of restraint during freezing pipe installation can easily damage the steel reinforcement in the segments, reducing the structural safety margin. Second, after construction, the sealing steel plate is connected to the concrete segment using expansion bolts. These bolts, exposed to the humid tunnel environment over a long period, are prone to corrosion and failure, potentially causing the outer steel plate to detach and affecting subway operation safety. Summary of the Invention

[0004] To address the problems existing in the aforementioned freezing pipe construction methods, this invention designs a method for constructing a special-shaped steel sleeve, pipe segments, tunnel, and freezing pipe. This invention pre-embeds special-shaped steel sleeve segments, which can prevent damage to the pipe segment reinforcement due to installation deviations during construction and ensure reliable sealing of the freezing pipe holes after construction. The specific technical solution is as follows:

[0005] This invention discloses a special-shaped steel sleeve, comprising:

[0006] The steel sleeve body is a barrel shape with asymmetrical sidewalls and gradually decreasing dimensions from the top to the bottom. One sidewall has a straight line segment along the axial direction, and the other sidewall has a semi-trumpet-shaped line segment along the axial direction. The lower end face of the steel sleeve body is provided with a fixing tenon in the radial direction, and the lower end face of the steel sleeve body is provided with a sealing connecting ring plate in the radial direction.

[0007] A rubber positioning sleeve, comprising a bottom surface and an upwardly protruding column in the middle of the bottom surface, wherein a connecting groove is provided on the outer edge of the bottom surface;

[0008] The fixing tenon can engage with the connecting groove so that the rubber positioning sleeve can be fixed to the lower end face of the steel sleeve body.

[0009] Furthermore, an anchoring ring is provided on the outer wall of the steel casing column.

[0010] The present invention also discloses a pipe segment block for freezing pipe construction, wherein at least one special-shaped steel sleeve as described above is pre-embedded in the pipe segment block. The special-shaped steel sleeve is pre-embedded inside the pipe segment block and is set close to the inner wall of the pipe segment block. The lower end face of the special-shaped steel sleeve faces the inner wall of the pipe segment block, and the bottom surface of the rubber positioning sleeve is slightly higher than the inner wall of the pipe segment block.

[0011] The present invention also discloses a tunnel for freezing pipe construction, the tunnel including tunnel A and tunnel B, tunnel A being connected to tunnel B via a connecting channel, and a plurality of pipe segments for freezing pipe construction as described above being provided on the side of tunnel A and tunnel B near the connecting channel, the pipe segments being interconnected with freezing pipes via special-shaped steel sleeves, the special-shaped steel sleeves being used to position the freezing pipes inserted into the pipe segments.

[0012] Furthermore, the segments are connected by bolts passing through hand holes.

[0013] Furthermore, the center line of the irregular steel sleeve is located between the two main reinforcing bars of the pipe segment.

[0014] Furthermore, the irregularly shaped steel sleeve is arranged circumferentially along the inner side of the tube segment.

[0015] This invention also discloses a method for constructing a freezing pipe, which is used for constructing a tunnel for freezing pipe construction as described above, and includes the following specific steps:

[0016] Precast tube segments are positioned using rubber positioning sleeves to locate irregularly shaped steel sleeves, and the irregularly shaped steel sleeves are pre-embedded.

[0017] Before the construction of the connecting passage, the freezing pipes were installed according to the design angle;

[0018] After the construction of the connecting passage is completed, the opening of the freezing pipe is sealed, the excess freezing pipe on the inner wall of the pipe segment is cut off, and the space formed by the freezing pipe and the irregular steel sleeve is filled with cement mortar.

[0019] Furthermore, the spacing between the irregularly shaped steel sleeves depends on the location of the freezing pipes.

[0020] Furthermore, when sealing the opening of the freezing pipe, a sealing steel plate is used to seal the inner wall of the pipe segment, and the edge of the sealing steel plate is welded and fixed to the fixing tenon at the bottom of the special-shaped steel sleeve.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention utilizes pre-embedded irregular-shaped steel sleeves to guide and limit the freezing pipe, preventing damage to the segment reinforcement caused by excessive construction errors. The sealing steel plate is welded and fixed to the fixing tenon, avoiding the problem of the sealing steel plate falling off due to air humidity. The segment with pre-embedded irregular-shaped steel sleeves can not only prevent damage to the segment reinforcement due to deviation in the installation of the freezing pipe during construction, but also ensure reliable sealing of the freezing pipe hole after construction, thus guaranteeing the safe operation of the subway. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a three-dimensional structural diagram of the irregular-shaped steel sleeve of the present invention.

[0025] Figure 2 This is a schematic diagram of the irregular-shaped steel sleeve of the present invention.

[0026] Figure 3 The pipe segment block for the pre-embedded irregular steel sleeve of the present invention.

[0027] Figure 4 This is a cross-sectional view showing the arrangement of the freezing tubes of the present invention.

[0028] Figure 5 This is a perspective view of the tunnel structure of the present invention.

[0029] Figure 6 This invention relates to the drilling construction of the freezing pipe.

[0030] Figure 7 This is the sealing hole for the freezing tube of the present invention.

[0031] Figure 8 This is a detailed drawing of the sealing hole of the freezing tube of the present invention.

[0032] In the diagram: 1. Segment block; 2. Connecting passage; 3. Sealing and connecting ring plate; 4. Freezing pipe; 5. Manhole; 6. Bolt; 7. Anchor ring; 8. Column; 9. Fixing tenon; 10. Embedded center line; 11. First segment block; 12. Second segment block; 13. Third segment block; 14. Fourth segment block; 15. Fifth segment block; 16. Sixth segment block; 17. Sealing steel plate; 18. Bottom surface; 19. Connecting groove; 20. Tunnel A; 21. Tunnel B. Detailed Implementation

[0033] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0034] One embodiment provided by the present invention is as follows:

[0035] See Figures 1 to 2 This invention discloses a special-shaped steel sleeve, comprising:

[0036] The main body of the steel sleeve is a barrel shape with asymmetrical sidewalls that gradually decrease in size from the top to the bottom. One sidewall has a straight tangent along the axial direction, while the other sidewall has a semi-trumpet-shaped tangent. This design allows for guidance and positioning of the freezing pipe 4 at different angles during drilling. Compared to a full-trumpet shape, the semi-trumpet shape allows for more flexible adjustment of the freezing pipe 4's installation angle and reduces the sleeve size at the flare opening, enabling the sleeve to be placed within the gaps of the shield tunnel reinforcement without affecting the reinforcement arrangement. A fixing tenon 9 is radially inwardly located on the lower end face of the main body of the steel sleeve, and a sealing connecting ring plate 3 is radially outwardly located on the lower end face of the main body of the steel sleeve. These rings connect and fix the irregularly shaped steel sleeve to the tunnel segment 1. An anchoring ring 7 is provided on the outer wall of the steel sleeve column to anchor it within the reinforced concrete tunnel segment, preventing the irregularly shaped steel sleeve from loosening.

[0037] A rubber positioning sleeve is composed of a bottom surface 18 and a column 8 protruding upward from the middle of the bottom surface. A connecting groove 19 is provided on the outer edge of the bottom surface 18. The fixing tenon 9 can engage with the connecting groove 19 so that the rubber positioning sleeve can be fixed on the lower end face of the steel sleeve body.

[0038] See Figure 3 The present invention also discloses a pipe segment block for freezing pipe construction, wherein at least one special-shaped steel sleeve as described above is pre-embedded in the pipe segment block 1. The special-shaped steel sleeve is pre-embedded inside the pipe segment block 1 and is set close to the inner wall of the pipe segment block 1. The lower end face of the special-shaped steel sleeve faces the inner wall of the pipe segment block 1, and the bottom surface 18 of the rubber positioning sleeve is slightly higher than the inner wall of the pipe segment block 1.

[0039] See Figures 4 to 5 The present invention also discloses a tunnel for freezing pipe construction, the tunnel comprising tunnel A20 and tunnel B21, tunnel A20 being connected to tunnel B21 via a connecting passage 2. Several pipe segments 1, as described above, are arranged on the side of tunnel A20 and tunnel B21 near the connecting passage 2. Each pipe segment 1 is interconnected with a freezing pipe 4 via a shaped steel sleeve. The shaped steel sleeve is arranged circumferentially along the inner side of the pipe segment 1 and is used to position the freezing pipe 4 inserted into the pipe segment 1. Each freezing pipe 4 corresponds one-to-one with the shaped steel sleeve. The pipe segments 1 are connected by bolts 6 passing through handholes 5. The embedment centerline 10 of the shaped steel sleeve is located between two main reinforcing bars of the pipe segment 1, avoiding the location of the reinforcing bars.

[0040] In a preferred embodiment of the present invention, both tunnel A20 and tunnel B21 are composed of six segments, specifically including a first segment 11, a second segment 12, a third segment 13, a fourth segment 14, a fifth segment 15, and a sixth segment 16. Several irregularly shaped steel sleeves are installed on the side of the second segment 12, the third segment 13, and the fourth segment 14 near the connecting passage 2, which provides a better temporary reinforcement effect on the soil surrounding the connecting passage 2. Of course, there can be one first segment 11, one second segment 12, and one sixth segment 16, while the remaining third segment 13, fourth segment 14, and fifth segment 15 can be multiple segments, thus allowing for shield tunnel structures composed of 7, 8, or even 9 segments.

[0041] See Figures 6 to 8 The present invention also discloses a construction method for a freezing pipe, which is used for the construction of a tunnel for freezing pipe construction as described above, and includes the following specific steps:

[0042] The precast pipe segment 1 is positioned by a rubber positioning sleeve for the irregular steel sleeve, and the irregular steel sleeve is pre-embedded. The spacing of the irregular steel sleeve depends on the location of the freezing pipe 4.

[0043] Before the construction of the connecting passage 2, the freezing pipe 4 is installed according to the design angle. At this time, the inner wall of the special-shaped steel sleeve can play the role of guidance and limitation, avoiding excessive construction error that could damage the steel reinforcement of the pipe segment when the freezing pipe 4 is installed.

[0044] After the construction of connecting passage 2 is completed, the openings of the freezing pipe 4 are sealed, and excess freezing pipe 4 on the inner wall of segment 1 is removed to provide space for the sealing steel plate 17. Cement mortar is then used to fill the space formed by the freezing pipe 4 and the irregular steel sleeve. The inner wall of segment 1 is sealed with the sealing steel plate 17, and the edge of the sealing steel plate 17 is welded and fixed to the fixing tenon 9 at the bottom of the irregular steel sleeve. This avoids the problem of the sealing steel plate 17 falling off due to corrosion caused by moisture in the existing technology, which is fixed by expansion bolts, thus ensuring the safe operation of the subway.

[0045] The above method for pre-embedding irregularly shaped steel sleeve segments can not only avoid damage to the segment reinforcement due to deviation in the installation of freezing pipe 4 during construction, but also achieve reliable sealing of the freezing pipe 4 holes after construction.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A tunnel for construction using frozen pipes, characterized in that, The tunnel includes tunnel A (20) and tunnel B (21). Tunnel A (20) is connected to tunnel B (21) through a connecting passage (2). Several pipe segments (1) for freezing pipe construction are provided on the side of tunnel A (20) and tunnel B (21) near the connecting passage (2). The pipe segments (1) are connected to the freezing pipe (4) through a special-shaped steel sleeve. The special-shaped steel sleeve is used to position the freezing pipe (4) inserted into the pipe segment (1). Special-shaped steel sleeves include: The steel sleeve body is a barrel shape with asymmetrical sidewalls and the dimensions of the sidewalls gradually decrease from the upper end face to the lower end face. The tangent of one sidewall along the axial direction is a straight line segment, and the tangent of the other sidewall along the axial direction is a semi-trumpet-shaped line segment. The lower end face of the steel sleeve body is provided with a fixing tenon (9) in the radial direction inward, and the lower end face of the steel sleeve body is provided with a sealing connecting ring plate (3) in the radial direction outward. A rubber positioning sleeve is composed of a bottom surface (18) and a column (8) that protrudes upward from the middle of the bottom surface. A connecting groove (19) is provided on the outer edge of the bottom surface (18). The fixing tenon (9) can engage with the connecting groove (19) so that the rubber positioning sleeve can be fixed on the lower end face of the steel sleeve body; An anchoring ring (7) is provided on the outer wall of the main body of the steel casing. At least one of the special-shaped steel sleeves is pre-embedded inside the segment block (1). The special-shaped steel sleeve is pre-embedded inside the segment block (1) and is set close to the inner wall of the segment block (1). The lower end face of the special-shaped steel sleeve faces the inner wall of the segment block (1). The bottom surface (18) of the rubber positioning sleeve is slightly higher than the inner wall of the segment block (1).

2. The tunnel for freezing pipe construction according to claim 1, characterized in that, The tube segments (1) are connected by bolts (6) passing through hand holes (5).

3. The tunnel for freezing pipe construction according to claim 1, characterized in that, The center line (10) of the irregular steel sleeve is located between the two main reinforcing bars of the pipe segment (1).

4. The tunnel for freezing pipe construction according to claim 1, characterized in that, The irregular steel sleeve is arranged circumferentially along the inner side of the pipe segment (1).

5. A method for constructing a freezing pipe, characterized in that, The construction method described above is used for the construction of a tunnel for freezing pipe construction as described in claim 4, and includes the following specific steps: Precast pipe segments (1) are positioned by rubber positioning sleeves for irregular steel sleeves and the irregular steel sleeves are pre-embedded; Before the construction of the connecting passage (2), the frozen pipe (4) is installed according to the design angle; After the construction of the connecting passage (2) is completed, the opening of the freezing pipe (4) is sealed, the excess freezing pipe (4) on the inner wall of the pipe segment (1) is cut off, and cement mortar is filled into the space formed by the freezing pipe (4) and the irregular steel sleeve.

6. The construction method of a freezing pipe according to claim 5, characterized in that, The spacing between the irregular steel sleeves depends on the location of the freezing pipe (4).

7. The construction method for a freezing pipe according to claim 5, characterized in that, When sealing the opening of the freezing pipe (4), a sealing steel plate (17) is used to seal the inner wall of the pipe segment (1). The edge of the sealing steel plate (17) is welded and fixed to the fixing tenon (9) at the bottom of the special-shaped steel sleeve.

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