Guiding rope traction type shield segment bag grouting method

Abstract

The invention discloses a guide rope traction type shield segment bag grouting method which comprises the following steps: S1, constructing an annular segment: constructing on the inner wall of a tunnel to form the annular segment, separately forming a first grouting hole and a second grouting hole in the bottom of the annular segment, arranging a traction rope on the periphery of the annular segment, the two ends of the traction cable penetrate through the first grouting hole and the second grouting hole correspondingly to stretch into the annular pipe piece. S2, real-time detection: arranging an endoscope on a traction cable in the annular duct piece, pulling the traction cable to enable the endoscope to penetrate through the first grouting hole to enter the space between the annular duct piece and the inner wall of the tunnel, and moving along the circumferential direction of the annular duct piece to detect the disengagement position of the inner wall of the tunnel and the non-dense grouting position of the shield tail behind the annular duct piece; the endoscope penetrates through the second grouting hole and returns to the interior of the annular pipe piece; s3, a grouting bag is arranged in a pulling mode; and S4, grouting is conducted. According to the guide rope traction type shield segment bag grouting method, the real situation can be accurately detected, the grouting and filling effect is good, the construction cost is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly relates to a method for grouting a shield segment with a cable-guided bag. Background Technique

[0002] After the segment is assembled, there are gaps between the tunnel lining and the surrounding rock. After the segment leaves the shield tail, adverse phenomena such as segment floating are likely to occur. In order to control segment floating, there are currently various methods, mainly including direct segment grouting method, anchor fixing method, and bag grouting method.

[0003] The direct grouting method is more difficult to apply in water-rich strata. The slurry is easily washed away by flowing water and difficult to solidify. If there is a void in the surrounding rock, it is impossible to accurately grasp parameters such as grouting pressure and grouting volume. The method of connecting and fixing the segment to the surrounding rock with bolts also has certain disadvantages. The contact area between the bolt and the segment is small, which is likely to cause concentrated attraction of the segment and result in damage. Traditional bag grouting methods often have relatively complex construction procedures, or require the design of specific segment structures, and some also require the use of complex devices, with complex construction and high costs.

[0004] The existing Chinese patent document with the application number 202311028052.5 discloses a bag-type secondary grouting construction method and device for limiting slurry distribution in a shield tunnel, which specifically discloses the following: Detect the post-grouting quality of the shield segment through existing shield grouting detection instruments to detect whether there is a grouting defect area, that is, the void area behind the shield segment; for the detected grouting defect area, drill through the shield segment reserved grouting hole from the shield tunnel clearance to the other side to form a through grouting hole; insert a grouting pipe into the grouting hole, and install a control valve at the grouting port of the grouting pipe; evaluate the size and shape of the grouting defect area, and select or sew a corresponding grouting bag; compress the grouting bag and the flexible grouting pipe connected to it and insert them into the pushing pipe from one end. The pushing pipe is inserted into the back side of the shield segment through the control valve, and the grouting bag is pushed out from the other end of the pushing pipe by using compressed air; inject slurry at the end of the flexible grouting pipe, and the slurry expands in the grouting bag, and the grouting bag forms a limit on the grouting range. The bag-type secondary grouting for limiting slurry distribution in this shield tunnel has the following deficiencies:

[0005] 1) Use existing shield grouting detection instruments to detect whether there is poor grouting in the shield segment. The existing shield grouting detection instruments can only detect inside the segment, and the detection effect is not good, making it difficult to accurately detect the true situation outside the segment;

[0006] 2) It is necessary to drill through the segment to form multiple grouting holes, which increases the construction difficulty and affects the construction efficiency;

[0007] 3) The grouting bag is inserted into the back side of the pipe segment through the push tube. After the grouting is filled, it can only expand near the grouting hole, and the filling effect on the loose area is poor;

[0008] 4) Each loose area needs to be drilled with at least one grouting hole, and each grouting hole needs to be provided with a grouting valve and a grouting bag inserted, which makes the construction troublesome, inefficient and costly. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a guide-cable-traction shield segment bag grouting method that can accurately detect the actual situation, has good grouting and filling effect, reduces construction labor, reduces construction costs, and improves construction efficiency.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] A cable-pulled shield segment bag grouting method comprises the following steps:

[0012] S1. Construction of annular segments: An annular segment is formed on the inner wall of the tunnel. A first grouting hole and a second grouting hole are respectively provided on both sides of the bottom of the annular segment. A traction rope is provided on the outer periphery of the upper part of the annular segment. Both ends of the traction rope pass through the first grouting hole and the second grouting hole and extend into the annular segment.

[0013] S2, real-time detection: an endoscope is placed on a traction rope inside the annular segment, and the traction rope is pulled to make the endoscope pass through the first grouting hole and enter between the annular segment and the inner wall of the tunnel, and move along the circumference of the annular segment to detect the empty position of the inner wall of the tunnel and the loose grouting of the shield tail behind the annular segment, and then the endoscope is passed through the second grouting hole back to the inside of the annular segment;

[0014] S3, pulling and installing the grouting bag: fix the grouting end of the grouting bag with a bursting valve inside the annular segment, and fix the other end to the traction rope inside the annular segment, pull the traction rope to make the grouting bag pass through the first grouting hole or the second grouting hole into the space between the annular segment and the inner wall of the tunnel, and move along the circumference of the annular segment, so that the grouting bag passes through the loose grouting area of ​​the shield tail and the bursting valve is located in the empty position;

[0015] S4. Grouting: Grouting is injected into the grouting bag through the grouting end of the grouting bag, so that the grouting bag expands and fits the outer wall of the annular segment and the inner wall of the tunnel, and fills the loose grouting of the shield tail, so that the bursting valve exceeds the limit pressure and opens, so that the slurry can fill the empty position through the bursting valve.

[0016] As a further improvement of the above technical solution:

[0017] In S1, a rope-fixing component is provided inside the annular segment, and both sides of the towing cable are respectively connected to the corresponding rope-fixing components.

[0018] The rope-fixing component is a steel wire installed on the annular segment.

[0019] In S1, both ends of the towing cable are connected inside the annular segment to form a closed-loop cable.

[0020] In S1, the towing cable is in a tensioned state.

[0021] In S1, the annular segment is assembled by multiple arc-shaped segments, blind holes are preset on the arc-shaped segments, and the first grouting hole and the second grouting hole are formed by drilling through the corresponding blind holes.

[0022] After the annular segment is assembled on the inner wall of the tunnel, the towing cable is installed and tensioned.

[0023] The blind holes on the arc-shaped segments are selectively drilled through, at least two towing cables are provided, and both ends of each towing cable respectively pass through two drilled-through blind holes and extend into the annular segment.

[0024] A cable guiding component for installing the towing cable is provided on the outer side of the annular segment.

[0025] Before S3 is carried out, the endoscope is removed from the towing cable.

[0026] Compared with the prior art, the advantages of the present invention are as follows:

[0027] For the cable guiding and towing type shield segment bag grouting method of the present invention, firstly, the towing cable between the first grouting hole and the second grouting hole is used to tow the endoscope to move circumferentially along the annular segment to detect the void position on the inner wall of the tunnel and the non-dense part of the tail shield grouting behind the annular segment. Compared with detecting inside the annular segment, the detection effect is good, and the real situation outside the segment can be accurately detected; secondly, there is no need to open multiple holes for detection. For detection, only two holes, namely the first grouting hole and the second grouting hole, need to be opened to achieve detection, reducing the construction difficulty and improving the construction efficiency; thirdly, the grouting bag is pulled and extended by the towing cable, which can not only make the grouting bag reach the non-dense part of the tail shield grouting, but also make the blasting valve of the grouting bag located at the void position. Compared with inserting the pushing pipe, the grouting bag can reach more required positions, has a wide coverage range, has a good filling effect on the non-dense part, and can reduce the number of grouting holes opened, thereby reducing the construction labor volume, reducing the construction cost, and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flowchart of the cable guiding and towing type shield segment bag grouting method of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the circular segment and the traction cable of the cable-guided shield segment bag grouting method of the present invention.

[0030] Figure 3 It is Figure 2 The enlarged structural diagram at position A in

[0031] Figure 4 It is a schematic diagram of the on-site detection of the cable-guided shield segment bag grouting method of the present invention.

[0032] Figure 5 It is Figure 4 The enlarged structural diagram at position B in

[0033] Figure 6 It is a schematic diagram of pulling and installing the grouting bag in the cable-guided shield segment bag grouting method of the present invention.

[0034] Figure 7 It is Figure 6 The enlarged structural diagram at position C in

[0035] Figure 8 It is Figure 6 The enlarged structural diagram at position D in

[0036] Figure 9 It is a front view structural diagram of the arc segment in the cable-guided shield segment bag grouting method of the present invention.

[0037] Figure 10 It is a rear view structural diagram of the arc segment in the cable-guided shield segment bag grouting method of the present invention.

[0038] Figure 11 It is a perforated installation diagram of the traction cable in the cable-guided shield segment bag grouting method of the present invention.

[0039] Figure 12 It is Figure 11 The transverse sectional structural diagram of

[0040] Figure 13 It is an external end connection diagram of the traction cable in the cable-guided shield segment bag grouting method of the present invention.

[0041] Figure 14 It is Figure 13 The transverse sectional structural diagram of

[0042] Figure 15 It is a tensioning connection diagram of the traction cable in the cable-guided shield segment bag grouting method of the present invention.

[0043] Figure 16 It is Figure 15 The transverse sectional structural diagram of

[0044] Figure 17 It is a structural connection diagram of the traction cable of the guiding cable traction type shield segment bag grouting method of the present invention at the position of the tail brush of the shield tail.

[0045] Figure 18 It is Figure 17 a schematic cross-sectional structure diagram of

[0046] Figure 19 It is a structural connection diagram of the traction cable of the guiding cable traction type shield segment bag grouting method of the present invention passing over the shield tail.

[0047] Figure 20 It is Figure 19 a schematic cross-sectional structure diagram of

[0048] Each label in the figure represents:

[0049] 1. Tunnel; 2. Annular segment; 21. Arc segment; 3. First grouting hole; 4. Second grouting hole; 5. Traction cable; 51. Endoscope; 6. Grouting bag; 61. Blasting valve; 7. Void position; 8. Cable fixing component; 9. Blind hole. Specific embodiments

[0050] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0053] In the present invention, unless otherwise clearly specified and defined, terms such as "assembly", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Embodiment 1:

[0055] Figures 1 to 20 An embodiment of the cable-guided shield segment grouting method of the present invention is shown. The cable-guided shield segment grouting method of this embodiment includes the following steps:

[0056] S1. Construct the circular segment 2: Construct a circular segment 2 on the inner wall of the tunnel 1. The first grouting hole 3 and the second grouting hole 4 are respectively provided on both sides of the bottom of the circular segment 2. The traction cable 5 is provided on the outer periphery of the upper part of the circular segment 2. Both ends of the traction cable 5 pass through the first grouting hole 3 and the second grouting hole 4 and extend into the circular segment 2.

[0057] S2. In-situ detection: As Figure 4 and Figure 5 shown, the endoscope 51 is arranged on the traction cable 5 inside the circular segment 2. The traction cable 5 is pulled to make the endoscope 51 pass through the first grouting hole 3 and enter between the circular segment 2 and the inner wall of the tunnel 1, and move circumferentially along the circular segment 2 to detect the void position 7 on the inner wall of the tunnel 1 and the non-dense shield tail grouting behind the circular segment 2. Then, the endoscope 51 passes through the second grouting hole 4 and returns to the inside of the circular segment 2.

[0058] S3. Lay the grouting bag 6: Figures 6 to 8 As shown, the grouting end of the grouting bag 6 provided with the blasting valve 61 is fixed inside the circular segment 2, and the other end is fixed on the traction cable 5 inside the circular segment 2. The traction cable 5 is pulled to make the grouting bag 6 pass through the first grouting hole 3 or the second grouting hole 4 and enter between the circular segment 2 and the inner wall of the tunnel 1, and move circumferentially along the circular segment 2, so that the grouting bag 6 passes through the non-dense shield tail grouting area and the blasting valve 61 is located at the void position 7.

[0059] S4. Grouting: Grout into the grouting bag 6 through the grouting end of the grouting bag 6, so that the grouting bag 6 expands and fits against the outer wall of the circular segment 2 and the inner wall of the tunnel 1, and fills the non-dense shield tail grouting area, so that the blasting valve 61 opens when the limit pressure is exceeded, so that the grout fills the void position 7 through the blasting valve 61.

[0060] The present method for grouting the segment pocket of a shield tunnel with a guide cable traction has the following advantages: First, the endoscope 51 is moved circumferentially along the segment ring 2 by the traction cable 5 between the first grouting hole 3 and the second grouting hole 4 to detect the void position 7 on the inner wall of the tunnel 1 and the non-dense areas of the tail shield grouting behind the segment ring 2. Compared with detecting inside the segment ring 2, the detection effect is better, and the true situation outside the segment can be accurately detected. Second, there is no need to open multiple holes for detection. For detection, only two holes, namely the first grouting hole 3 and the second grouting hole 4, need to be opened to achieve detection, reducing the construction difficulty and improving the construction efficiency. Third, the grouting pocket 6 is pulled and extended by the traction cable 5, which can not only move the grouting pocket 6 to the non-dense areas of the tail shield grouting but also make the blasting valve 61 of the grouting pocket 6 located at the void position 7. Compared with inserting the pushing pipe, the grouting pocket 6 can reach more required positions, with a wide coverage range, good filling effect for non-dense areas, and can reduce the number of grouting holes opened, thereby reducing the construction labor volume, lowering the construction cost, and improving the construction efficiency.

[0061] Further, as Figure 9 and Figure 10 shown, in this embodiment, a cable fixing component 8 is provided inside the segment ring 2, and both sides of the traction cable 5 are respectively connected to the corresponding cable fixing components 8. Connecting both sides of the traction cable 5 to the corresponding cable fixing components 8 can prevent the traction cable 5 from slipping out of the first grouting hole 3 and the second grouting hole 4. When it is necessary to pull the traction cable 5, the connection between the traction cable 5 and the cable fixing component 8 is released.

[0062] Further, in this embodiment, the cable fixing component 8 is a steel wire installed on the segment ring 2. The steel wire can be tied to the segment ring 2 through the first grouting hole 3 or the second grouting hole 4, or one end can be hooked into the first grouting hole 3 or the second grouting hole 4 and the other end can be hooked to the end of the segment ring 2, or it can be fixed to the segment ring 2 in other ways.

[0063] Further, in this embodiment, in S1, the traction cable 5 is in a tensioned state. When the traction cable 5 is in a tensioned state and the shield machine advances and the tail shield reinforcement ring and tail brush cross the traction cable 5, the traction cable 5 will not be carried away.

[0064] Further, in this embodiment, in S1, the segment ring 2 is assembled by multiple arc-shaped segments 21, and blind holes 9 are preset on the arc-shaped segments 21. The first grouting hole 3 and the second grouting hole 4 are formed by drilling through the corresponding blind holes 9.

[0065] Further, in this embodiment, after the segment ring 2 is assembled on the inner wall of the tunnel 1, the traction cable 5 is installed and tensioned, as Figures 11 to 15 shown.

[0066] Further, in this embodiment, the blind holes 9 on the arc-shaped segment 21 are selectively drilled through, and at least two traction cables 5 are provided. Both ends of each traction cable 5 pass through two drilled blind holes 9 and extend into the circular segment 2. In this way, the corresponding traction cable 5 can be selected according to actual needs to pull the grouting bladder 6, and the starting position of pulling the grouting bladder 6 has greater selectivity.

[0067] Further, in this embodiment, a cable guiding component for installing the traction cable 5 is provided on the outer side of the circular segment 2. In this way, after the circular segment 2 is assembled, the traction cable 5 can be guided to the first grouting hole 3, the second grouting hole 4 or other drilled blind holes 9 through the cable guiding component, which is convenient for the installation of the traction cable 5.

[0068] Further, in this embodiment, before S3 is performed, the endoscope 51 is removed from the traction cable 5. Of course, the endoscope 51 can also not be removed, so as to realize the detection while pulling the grouting bladder 6.

[0069] Figures 11 to 20 Shows an installation method of the traction cable 5, including the following steps: First, as Figure 11 and Figure 12 shown, after the circular segment 2 is constructed on the inner wall of the tunnel 1, one ends of two ropes are respectively extended into the circular segment 2 through the first grouting hole 3 and the second grouting hole 4; Secondly, as Figure 13 and Figure 14 shown, the other ends of the two ropes are connected to form a complete traction cable 5; Then, as Figure 15 and Figure 16 shown, the traction cable 5 is tightened through the two ends of the traction cable 5 located inside the circular segment 2, so that the traction cable 5 is close to the outer periphery of the upper part of the circular segment 2; Then, as Figure 17 and Figure 18 shown, the shield machine advances, and the shield tail reinforcement ring and the tail brush cross over the traction cable 5; Then, as Figure 19 and Figure 20 shown, the shield machine continues to advance, the traction cable 5 exits the shield tail, and then the endoscope 51 is guided to check the inner wall condition of the excavated tunnel 1 and the shield tail grouting condition.

[0070] Further, in this embodiment, during the grouting process, as the slurry pressure in the grouting bladder 6 increases, the grouting bladder 6 gradually expands and fits with the inner wall of the tunnel 1. When further grouting, restricted by the inner wall of the tunnel 1, the slurry pressure in the grouting bladder 6 further increases. When the slurry pressure exceeds the limit pressure of the bursting valve 61, the slurry will flow out through the bursting valve 61 and fill the void position 7 on the inner wall of the tunnel 1, realizing the plugging of the void position 7.

[0071] The method for grouting the shield segment pocket by cable traction of the present invention is simple in construction. The grouting pocket 6 is installed by traction of the traction cable 5, without the need for complex lining structures and devices, and is convenient and fast in construction, and the required cost is low. It can complete the inspection of the void situation on the inner wall of the tunnel 1 after lining and the shield tail grouting situation, and can achieve the filling and sealing of the void position 7 under the targeted design of the grouting pocket 6.

[0072] Embodiment 2:

[0073] Another embodiment of the method for grouting the shield segment pocket by cable traction of the present invention. The method of this embodiment is basically the same as that of Embodiment 1, except that in step S1, both ends of the traction cable 5 are connected inside the annular segment 2 to form a closed-loop cable, which on the one hand does not affect the annular pulling, and on the other hand, has a good anti-disconnection effect.

[0074] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the above-disclosed technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A cable-pulled shield segment bag grouting method, characterized in that: The steps include: S1. Construction of an annular segment (2): An annular segment (2) is formed on the inner wall of a tunnel (1), wherein a first grouting hole (3) and a second grouting hole (4) are respectively provided on both sides of the bottom of the annular segment (2), and a traction rope (5) is provided on the outer periphery of the upper portion of the annular segment (2), and two ends of the traction rope (5) respectively pass through the first grouting hole (3) and the second grouting hole (4) and extend into the annular segment (2); S2, real-time detection: an endoscope (51) is arranged on a traction rope (5) inside the annular segment (2), and the traction rope (5) is pulled to make the endoscope (51) pass through the first grouting hole (3) to enter between the annular segment (2) and the inner wall of the tunnel (1), and move along the circumference of the annular segment (2) to detect the empty position (7) of the inner wall of the tunnel (1) and the loose grouting position of the shield tail behind the annular segment (2), and then the endoscope (51) is passed through the second grouting hole (4) to return to the inside of the annular segment (2); S3, pulling and installing the grouting bag (6): fixing the grouting end of the grouting bag (6) provided with the bursting valve (61) inside the annular segment (2), and fixing the other end on the traction rope (5) inside the annular segment (2), pulling the traction rope (5) so that the grouting bag (6) passes through the first grouting hole (3) or the second grouting hole (4) and enters between the annular segment (2) and the inner wall of the tunnel (1), and moves along the circumference of the annular segment (2), so that the grouting bag (6) passes through the loose grouting area of ​​the shield tail and the bursting valve (61) is located at the empty position (7); S4, grouting: grouting is injected into the grouting bag (6) through the grouting end of the grouting bag (6), so that the grouting bag (6) expands and fits the outer wall of the annular segment (2) and the inner wall of the tunnel (1), and fills the loose grouting area of ​​the shield tail, so that the bursting valve (61) exceeds the limit pressure and opens, so that the slurry passes through the bursting valve (61) to fill the empty position (7).

2. The cable-pulled shield segment bag grouting method according to claim 1 is characterized in that: In S1, a rope fixing component (8) is provided inside the annular segment (2), and both sides of the traction rope (5) are respectively connected to the corresponding rope fixing components (8).

3. The cable-pulled shield segment bag grouting method according to claim 2 is characterized in that: The rope fixing component (8) is a steel wire installed on the annular segment (2).

4. The cable-pulled shield segment bag grouting method according to claim 1 is characterized in that: In S1, the two ends of the traction rope (5) are connected inside the annular segment (2) to form a closed loop rope.

5. The cable-pulled shield segment bag grouting method according to claim 1 is characterized in that: In S1, the traction rope (5) is in a tensioned state.

6. The cable-pulled shield segment bag grouting method according to claim 1 is characterized in that: In S1, the annular segment (2) is formed by assembling a plurality of arc-shaped segments (21), a blind hole (9) is preset on the arc-shaped segment (21), and the first grouting hole (3) and the second grouting hole (4) are formed by drilling through the corresponding blind holes (9).

7. The cable-pulled shield segment bag grouting method according to claim 6 is characterized in that: After the annular segments (2) are assembled on the inner wall of the tunnel (1), the traction ropes (5) are installed and tightened.

8. The cable-pulled shield segment bag grouting method according to claim 6 is characterized in that: The blind holes (9) on the arc-shaped segment (21) are selectively drilled, and at least two traction cables (5) are provided. The two ends of each traction cable (5) respectively pass through the two drilled blind holes (9) and extend into the annular segment (2).

9. The cable-pulled shield segment bag grouting method according to any one of claims 1 to 8, characterized in that: A guide rope component for installing a traction rope (5) is provided on the outer side of the annular segment (2).

10. The cable-pulled shield segment bag grouting method according to any one of claims 1 to 8, characterized in that: Before the step S3 is performed, the endoscope (51) is removed from the traction cable (5).

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