Shield type TBM tunnel hexagonal segment suitable for high-pressure water-rich stratum
By setting grouting hole groups and inclined grouting inner sleeves on the hexagonal segments of the shield-type TBM tunnel, precise positioning grouting and adjustment were achieved, solving the problems of poor assembly quality and waterproofing effect in high-pressure water-rich strata, and improving the tunnel's water-blocking ability and environmental friendliness.
Patent Information
- Application Number
- CN202520784036.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-04-23
AI Technical Summary
In high-pressure, water-rich strata, the quality of hexagonal segment assembly in shield-type TBM tunnels is difficult to control, resulting in poor waterproofing, ineffective grouting and water plugging, inability to adjust the direction of grouting holes, inability to adjust segment misalignment, and easy damage to the leading half-ring, leading to serious tunnel leakage and impacting the environment and people's livelihoods.
A hexagonal segment for shield-type TBM tunnels suitable for high-pressure, water-rich strata was designed. It adopts two rows of spaced grouting hole groups. Each row of grouting holes has a threaded section at the end near the rock wall. The segments are connected to the grouting holes by adjusting bolts. The grouting holes are equipped with inclined grouting inner sleeves. The pre-embedded steel plates are welded to the grouting guide pipes to achieve precise positioning and adjustment of grouting, forming an effective surrounding rock grouting ring.
It improved the quality of segment assembly and waterproofing, enhanced the grouting and water-stopping capabilities, reduced tunnel leakage, lowered the environmental impact, conformed to the concept of green construction, and improved the safety and environmental friendliness of the tunnel structure.
Smart Images
Figure CN223881191U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of tunnel engineering, more specifically, it is a kind of shield type TBM tunnel hexagonal segment suitable for high pressure water-rich stratum. BACKGROUND
[0002] China is a mountainous country, in shield type TBM tunnel engineering construction, hexagonal TBM segment has the advantage of efficient assembly, but its assembly quality is difficult to control and waterproof failure in water-rich surrounding rock section is urgent to be solved.
[0003] At present, the following limitations still exist in the construction of shield type TBM tunnel with hexagonal segment in high pressure water-rich stratum:
[0004] 1) Poor assembly quality: although the assembly speed is fast, the assembly quality is difficult to control; the main problem is that the net distance control of segment outer arc surface and rock wall is not good; poor assembly quality of segment will directly reduce the waterproof ability of segment, and it is very important to ensure the accuracy of segment assembly and control the error within a very small range for the structural safety and waterproof and drainage effect of shield type TBM tunnel.
[0005] 2) The effectiveness of tunnel waterproof is reduced: the lack of segment assembly quality leads to a big discount in the waterproof effect of EPDM sealing pad, and the phenomenon of tunnel water leakage occurs;
[0006] 3) Poor grouting and water plugging effect: the conventional segment is only reserved with 3 grouting holes at most, and the longitudinal distance of grouting hole is more than 1.5m, in water-rich high water head section, the radial grouting effect of more than 1.5m interval cannot guarantee the water plugging effect. It cannot resist the high water head of surrounding rock by grouting ring.
[0007] 4) The direction of grouting pipe cannot be adjusted: after the leakage of shield type TBM tunnel, grouting and water plugging are needed, the conventional grouting hole can only adapt to the radial grouting perpendicular to rock wall, and cannot directly penetrate into the water seepage place for grouting.
[0008] 5) The misalignment between segments cannot be adjusted: after the misalignment of segment assembly, it is difficult to adjust the misalignment, and an urgent measure is needed to adjust and control the misassembly.
[0009] 6) The advanced half-ring segment is easy to be damaged: due to the staggered assembly of hexagonal segment, there are two segments of advanced half-ring, the half-ring is in cantilever stress mode, and is easy to be damaged.
[0010] In addition, through the investigation of the existing tunnels, there is a saying of "nine out of ten tunnels leak", and some tunnels have serious water leakage, which leads to huge tunnel drainage capacity, and directly causes the environment damage and livelihood accidents that the vegetation on the ground cannot grow normally; due to the unpredictability of the tunnel project, the phenomenon of water leakage always occurs in the tunnel construction. Therefore, an effective treatment solution for water leakage needs to be proposed to realize the full-packaged waterproof effect of the shield TBM tunnel, reduce the damage to the underground water, and improve the environmental protection of the tunnel engineering construction. Content of the utility model
[0011] The utility model aims at overcoming the defects in the prior art and provides a shield TBM tunnel hexagonal segment suitable for high-pressure water-rich strata.
[0012] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a shield TBM tunnel hexagonal segment suitable for high-pressure water-rich strata, characterized by comprising two rows of grouting hole groups arranged at intervals on the hexagonal segment, each row of the grouting hole groups comprising a plurality of grouting holes arranged at intervals; a threaded section is arranged at one end of the grouting hole close to the rock wall, and a segment attitude adjusting bolt is detachably connected with the grouting hole through the threaded section; one end of the segment attitude adjusting bolt abuts against the rock wall, and the other end is provided with a hexagonal rotating bolt head.
[0013] In the above technical scheme, an inclined grouting inner sleeve is arranged in the threaded section of the grouting hole.
[0014] In the above technical scheme, the inclined grouting inner sleeve can realize a rotation of 6°.
[0015] In the above technical scheme, the plurality of hexagonal segments are staggered and assembled, two hexagonal segments are advanced half rings, and pre-embedded steel plates are arranged in the side of the hexagonal segments of the two advanced half rings close to the rock wall, and the pre-embedded steel plates are welded with grouting small guide pipes through fixed anchor pipes.
[0016] In the above technical scheme, the distance between the two rows of grouting hole groups is less than 1m.
[0017] Compared with the prior art, the utility model has the following advantages:
[0018] 1) The utility model realizes effective grouting, reduces the drainage capacity of the tunnel, is friendly to the environment, and the construction concept conforms to the construction concept of "green mountains are always in sight"; an effective surrounding rock grouting circle is formed to resist high water head, the water head borne by the tunnel structure is reduced, the reinforcement of the segment is reduced, and energy saving and environmental protection are achieved.
[0019] 2) The segment assembly quality is improved: the utility model adjusts the net distance between the outer arc surface of the hexagonal segment and the rock wall by using the segment attitude adjusting bolt to abut against the rock wall through the grouting hole, and adjusts the segment assembly precision and the staggered phenomenon between the segments.
[0020] 3) Form an effective surrounding rock grouting circle to resist high water head: the utility model discloses each ring six hexagonal pipe piece passes through setting double-row grouting hole group, realizes that grouting hole group longitudinal spacing is about 0.8m (less than 1m), can promote the grouting effect of surrounding rock circle, effectively resists the high water head of surrounding rock.
[0021] 4) The treatment of leakage water: when the pipe piece concrete waterproof failure appears partial water seepage, the utility model discloses the rotation of oblique grouting inner sleeve realizes the grouting hole of adjustable angle, realizes accurate positioning grouting and blocks water.
[0022] 5) Advance half-ring pipe piece lock foot: the utility model discloses the welding of grouting small catheter and pipe piece inner pre-buried steel plate, and the lock foot of advance half-ring pipe piece reduces the risk of pipe piece breakage. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the assembling schematic view of six hexagonal pipe pieces.
[0024] Figure 2 It is the structural schematic view of six hexagonal pipe pieces.
[0025] Figure 3 It is the structural schematic view of grouting hole and oblique grouting inner sleeve.
[0026] Figure 4 It is the structural schematic view of oblique grouting inner sleeve.
[0027] Figure 5 It is the structural schematic view of pipe piece posture adjusting bolt.
[0028] Figure 6 It is Figure 1 Large sample view at A.
[0029] Figure 7 It is the schematic view of the utility model and forms effective surrounding rock grouting circle.
[0030] Figure 8 It is Figure 7 Side view.
[0031] Wherein, 100-six hexagonal pipe pieces, 110-pre-buried steel plate, 111-fixed anchor pipe, 200-grouting hole group, 210-grouting hole, 211-threaded section, 220-pipe piece posture adjusting bolt, 221-six hexagonal rotary bolt head, 230-oblique grouting inner sleeve, 240-grouting small catheter, 300-rock wall. DETAILED DESCRIPTION
[0032] The embodiment of the utility model is explained in detail below in combination with the drawings, but they do not constitute the limitation to the utility model, just for example. Meanwhile, through the explanation, the advantages of the utility model will become more clear and easy to understand.
[0033] As shown in the drawings, the shield TBM tunnel hexagonal segment suitable for high-pressure water-rich stratum comprises two rows of grouting hole groups 200 arranged on the hexagonal segment 100, each row of the grouting hole groups 200 comprises a plurality of spaced grouting holes 210; the grouting hole 210 is provided with a threaded section 211 near one end of the rock wall 300, and the segment posture adjusting bolt 220 is detachably connected with the grouting hole 210 through the threaded section 211; one end of the segment posture adjusting bolt 220 abuts against the rock wall 300, and the other end is provided with a hexagonal rotating bolt head 221.
[0034] The threaded section 211 of the grouting hole 210 is provided with an inclined grouting inner sleeve 230.
[0035] The inclined grouting inner sleeve 230 can realize a rotation of 6°.
[0036] Since the multiple hexagonal segments 100 are staggered and assembled, two hexagonal segments 100 are arranged in advance as half rings, and the hexagonal segments 100 of the two half rings are provided with pre-embedded steel plates 110 on the side close to the rock wall 300, and the pre-embedded steel plates 110 are welded with grouting small guide pipes 240 through fixed anchor pipes 111.
[0037] The distance between the two rows of grouting hole groups 200 is less than 1m.
[0038] The other parts not described belong to the prior art.
Claims
1. A shield TBM tunnel hexagonal segment suitable for use in high pressure water rich formations characterised in that: The invention discloses a grouting hole group (200) which is arranged on a hexagonal segment (100) in two rows, each row of the grouting hole group (200) comprises a plurality of grouting holes (210) arranged at intervals; the grouting hole (210) is provided with a threaded section (211) near one end of a rock wall (300), and a segment posture adjusting bolt (220) is detachably connected with the grouting hole (210) through the threaded section (211); one end of the segment posture adjusting bolt (220) abuts against the rock wall (300), and the other end is provided with a hexagonal rotating bolt head (221).
2. A shield TBM tunnel hexagonal segment suitable for use in high pressure water rich strata according to claim 1 characterised in that: The threaded section (211) of the grouting hole (210) is provided with an inclined grouting inner sleeve (230).
3. A shield TBM tunnel hexagonal segment suitable for use in high pressure water rich strata according to claim 2, characterised in that: The inclined grouting inner sleeve (230) can rotate by 6°.
4. A shield TBM tunnel hexagonal segment suitable for use in high pressure water rich strata according to claim 1, characterised in that: Since the plurality of hexagonal segments (100) are staggered and assembled, two hexagonal segments (100) are ahead of a half ring, and the two hexagonal segments (100) of the two ahead half rings are provided with a pre-embedded steel plate (110) on the side near the rock wall (300), and the pre-embedded steel plate (110) is welded with a grouting small catheter (240) through a fixed anchor pipe (111).
5. A shield TBM tunnel hexagonal segment suitable for use in high pressure water rich strata according to claim 1 characterised in that: The distance between the two rows of grouting hole groups (200) is less than 1m.