A secondary grouting permeable sheet for use between sewer pipe segments

Abstract

A secondary grouting permeation plate for drainage tunnel segments. When shield tunnel segments are used for drainage, the joints formed after adjacent shield tunnel segments are joined lack standardized grouting quality treatment, leading to potential grouting leaks. In this invention, the unfolded shape of the arc-shaped soft bladder plate matches the side shape of the precast shield tunnel segment. The arc-shaped soft bladder plate has a narrow, elongated cavity inside. Multiple mounting holes are machined on the top side of the arc-shaped soft bladder plate, and a water-stop needle is inserted into each mounting hole. The upper end of the water-stop needle is the grout inlet, and the lower end is the grout release end. The lower end of the water-stop needle is connected to the interior of the arc-shaped soft bladder plate. Multiple recesses are machined on the bottom side of the arc-shaped soft bladder plate, each recess corresponding to a bolt on the side of the precast shield tunnel segment. Multiple grout outlet holes are machined along the thickness direction of the arc-shaped soft bladder plate, and each grout outlet hole is connected to the narrow, elongated cavity of the arc-shaped soft bladder plate.

Description

Technical Field

[0001] The utility model specifically relates to a secondary grouting permeable sheet for between drainage pipe segments, which belongs to the technical field of drainage channel construction. Background Art

[0002] Shield segments are prefabricated in factories and are arc-shaped concrete (or steel-concrete) components that comply with relevant design standards. They are core components assembled into linings during shield construction, and undertake functions such as load bearing and waterproofing. When shield segments are used for drainage, the installation process of two adjacent shield segments is as follows: after the shield machine excavates to a specified position, its attitude is adjusted and fixed. A segment erector is used to grab the prefabricated segment and accurately hoist it to the assembly position. The capping segment, adjacent segments and standard segments are assembled in sequence, and connected and fixed into a ring by bolts. The flatness, gaps and waterproof performance of the segment ring are detected, and the next ring is assembled after passing the inspection.

[0003] In the construction of large-diameter trenchless drainage pipelines, shield segments are used for lining drainage, that is, in a shield tunnel, when it is necessary to release the water pressure behind the lining, the shield segments themselves can be used as drainage structures. By pre-embedding drain pipes with valves in the shield segments, or drilling holes outside the wall to set up drainage facilities after segment splicing, the groundwater behind the wall can be introduced into the tunnel and discharged. In addition, shield segments can also be used as the outer lining of a water conveyance tunnel, that is, shield segments can be used to construct the outer lining structure of a water conveyance tunnel. In actual engineering, drainage recesses can be arranged on the inner side of spliced shield segments and filled with drainage materials, thereby forming connected drainage channels to assist the water conveyance inner lining in drainage.

[0004] Shield segments can also directly form drainage pipelines. When the drainage pipeline is constructed by the shield method, shield segments can be directly spliced into a circular drainage channel to realize the water passing and drainage function.

[0005] When shield segments are used in drainage projects, after two adjacent shield segments are assembled, the grouting treatment at the joints formed between the two adjacent prefabricated segments belongs to the secondary grouting process. The necessity of grouting at the joints is mainly because there are tiny gaps after the segments are clamped, and grouting can fill the gaps, so that the dispersed segments form an integral stress structure, improving the bearing capacity and stability of the drainage channel. After grouting and curing with grouting materials (such as cement slurry and chemical slurry), a sealing layer can be formed to block the water seepage path at the joints, ensure the internal drying of the drainage channel, form a waterproof seal, and block the water seepage channel. Grouting can also reinforce the surrounding rock and control stratum settlement. The slurry penetrates into the gap between the segment and the surrounding rock, which can reinforce the surrounding soil or rock mass, reduce stratum deformation, and avoid settlement or deviation of the drainage channel. After secondary grouting, anti-corrosion protection can also be formed to prolong the service life of the segments, isolate the contact between groundwater, corrosive media and segment bolts and concrete, prevent corrosion and aging of components, and prolong the service life of the drainage channel.

[0006] During tunnel boring machine (TBM) construction, factors such as changes in groundwater pressure and geological conditions can easily lead to fluctuations in grout fluidity and setting time. Stable performance requires adjustments to the mix ratio (e.g., adding retarders and accelerators) and rigorous on-site testing. Currently, the joints of precast tunnel segments are inherently narrow gaps, making grouting relatively difficult. Uneven grouting and grout not reaching certain areas are common problems. Because the segments are connected by pre-installed bolts, these bolts also hinder grout injection at the joints. For larger joints, there is a lack of standardized grouting methods, creating potential leakage points. Currently, when TBM segments are used for drainage, there is no standardized method for grouting quality at the joints formed by connecting adjacent segments, hindering efforts to reduce the likelihood of leaks. Utility Model Content

[0007] This invention provides a secondary grouting permeation sheet for use between drainage pipe segments to solve the above-mentioned problems.

[0008] A secondary grouting permeation plate for drainage pipe segments includes an arc-shaped soft bladder and multiple water-stop needles. The unfolded shape of the arc-shaped soft bladder matches the side shape of the precast shield pipe segment. The interior of the arc-shaped soft bladder forms a narrow cavity. Multiple mounting holes are machined on the top side of the arc-shaped soft bladder, and a water-stop needle is inserted into each mounting hole. The upper end of the water-stop needle is the grout inlet end, and the lower end of the water-stop needle is the grout release end. The lower end of the water-stop needle is connected to the interior of the arc-shaped soft bladder. Multiple recesses are machined on the bottom side of the arc-shaped soft bladder, and each recess corresponds to a bolt on the side of the precast shield pipe segment. Multiple grout outlet holes are machined along the thickness direction of the arc-shaped soft bladder, and each grout outlet hole is connected to the narrow cavity of the arc-shaped soft bladder.

[0009] As a preferred option: the recessed part is a strip-shaped notch, and an inverted U-shaped piece is integrally connected in each strip-shaped notch. An arc-shaped block is provided on the inner wall of the arc end of the inverted U-shaped piece. When the arc-shaped soft bladder is inserted into the joint between two adjacent shield precast segments, the inverted U-shaped piece is tightly attached to the bolts on the side of the shield precast segment through the arc-shaped block.

[0010] As a preferred embodiment: the U-shaped piece includes an arc-shaped piece and two straight pieces. Each end of the arc-shaped piece is integrally connected to a straight piece. Each straight piece has an elongated hole processed on it. The elongated hole is connected to the narrow cavity and the length direction of the elongated hole is the same as the length direction of the straight piece.

[0011] As a preferred embodiment: the arc-shaped soft capsule includes a top piece, a bottom piece, two side pieces, and two end pieces. The two side pieces are arranged vertically side by side, and the top sides of the two side pieces are connected to each other through the top piece. The bottom sides of the two side pieces are connected to each other through the two end pieces. The inner wall of the top piece, the top wall of the bottom piece, the inner walls of the two side pieces, and the inner walls of the two end pieces enclose and form the elongated cavity.

[0012] As a preferred embodiment, a rigid guide strip is provided at each end of the arc-shaped soft capsule. One side of each rigid guide strip is fixedly connected to the outer wall of its corresponding end piece, and the length of the rigid guide strip is set to match the width of the arc-shaped soft capsule.

[0013] As a preferred embodiment: each discharge hole includes a circular hole and an extended slit, one end of which is connected to the circular hole.

[0014] Compared with the prior art, this utility model provides a secondary grouting permeation sheet for drainage pipe segments, which has the following beneficial effects: In this invention, an arc-shaped soft bladder is inserted into the joint between two adjacent precast tunnel segments. After insertion, it provides a grouting source with the help of multiple water-stop needles. Grout outlets at various locations enhance the grouting flow at each joint. The unfolded shape of the arc-shaped soft bladder matches the side shape of the precast tunnel segment, and combined with the multiple grout outlets and recessed structure, it ensures that the invention avoids the bolt positions on the side of the precast tunnel segment while providing grout supply to the space below the bolts. This reduces uneven grouting in confined spaces, minimizes the formation of grouting blind spots, and improves the uniformity of grouting at the joint and the sealing of all joints in the drainage pipeline. This invention, combined with a secondary grouting process, standardizes the grouting method at the joint, improves the grouting quality, and is particularly suitable for the standardized treatment of relatively large joints. It facilitates standardized operation of sealing and filling precast tunnel segments in large-scale drainage projects. The shield pipeline formed using this invention can be used for direct or external lining auxiliary drainage. Attached Figure Description

[0015] Figure 1 A schematic diagram of the main structure of the secondary grouting permeation plate used between drainage pipe segments; Figure 2 This is a three-dimensional structural diagram showing the connection between the arc-shaped soft capsule and the water-stopping needle. Only a portion of the arc-shaped soft capsule is shown in the diagram. Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4This is a schematic diagram of the cross-sectional structure of the arc-shaped soft capsule. The cutting direction in the figure is longitudinal, along the thickness direction of the arc-shaped soft capsule. Figure 5 This is a front view schematic diagram of the structure of the present invention used on the side of a precast tunnel segment of a shield tunnel. The position of the precast tunnel segment of the shield tunnel shown in the figure is its side position. Figure 6 A schematic diagram of the main structure of a stop needle; Figure 7 This is a side view of the structure of the present invention when used between two adjacent precast tunnel segments. The position of the precast tunnel segment shown in the figure is its end face position. Figure 8 A three-dimensional structural diagram showing multiple precast tunnel segments forming a ring of spliced ​​structures; the connection holes on each precast tunnel segment are not shown in the diagram. Figure 9 A three-dimensional structural diagram showing multiple prefabricated tunnel segments forming a multi-ring splicing structure.

[0016] In the diagram: 1-Arc-shaped soft bladder; 1-1-Top piece; 1-2-Bottom piece; 1-3-Side piece; 1-4-End piece; 2-Water-stop needle; 3-Mounting hole; 4-Recessed part; 5-Grouting hole; 5-1-Circular hole; 5-2-Extended long seam; 6-Narrow cavity; 7-Inverted U-shaped piece; 7-1-Arc-shaped piece; 7-2-Straight piece; 7-3-Long hole; 8-Arc-shaped block; 9-Rigid guide strip; 10-Shield precast segment; 11-Joint; 13-Extended flexible hose. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Specific implementation method one: Combining Figures 1 to 9This embodiment describes a secondary grouting penetration plate used between drainage pipe segments as a standardized embedded component for joint grouting. It includes an arc-shaped soft bladder 1 and multiple water-stop needles 2. The arc-shaped soft bladder 1 is a hollow sheet-like structure made of rubber, PVC, or other existing wear-resistant and durable building materials. When the arc-shaped soft bladder 1 is made of a flexible, wear-resistant building material, it can be folded. When the arc-shaped soft bladder 1 is in its unfolded state, its unfolded shape is a strip-shaped arc, a type of fan shape. Its specific unfolded shape is matched to the side shape of the precast tunnel segment 10. A narrow cavity 6 is formed inside the arc-shaped soft bladder 1. Multiple mounting holes 3 are machined on the top side of the arc-shaped soft bladder 1, and a water-stop needle 2 is inserted into each mounting hole 3. The upper end of the water-stop needle 2 is the grout inlet end. The lower end of the water-stop needle 2 is the grout release end. The water-stop needle 2 is also called a grouting nozzle. It is an existing grouting accessory used to connect the pump body to grout the joint 11 between two shield precast segments 10. The lower end of the water-stop needle 2 is connected to the interior of the arc-shaped soft bladder 1. The bottom side of the arc-shaped soft bladder 1 is machined with multiple recesses 4. The recesses 4 are used to make way for the bolts on the side of the shield precast segment 10, so as to achieve a bypass effect. This allows the bottom side of the arc-shaped soft bladder 1 to bypass each bolt during the insertion of the arc-shaped soft bladder 1 into the joint 11. Each recess 4 is set one-to-one with the bolts on the side of the shield precast segment 10. The arc-shaped soft bladder 1 is machined with multiple grout outlet holes 5 along its thickness direction. Each grout outlet hole 5 is connected to the narrow cavity 6 of the arc-shaped soft bladder 1. Grout is provided through the arc-shaped soft bladder 1 and squeezed out from each grout outlet hole 5 into the joint 11.

[0019] In this embodiment, the number, position, diameter, and shape of each grout outlet 5 can be configured according to the type of grouting, and can also be adjusted accordingly based on subsequent grouting requirements and construction requirements.

[0020] In this embodiment, the spacing between the multiple water-stopping needles 2 on the arc-shaped soft bladder 1 is 200-300 mm. Alternatively, the conventional spacing of the existing grouting nozzles at the joint 11 can be used as a reference, depending on the specific design requirements.

[0021] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. In this implementation method, the arc-shaped soft capsule 1 can be a flexible and rigid sheet body, which includes a top sheet 1-1, a bottom sheet 1-2, two side sheets 1-3 and two end sheets 1-4. The two side sheets 1-3 are arranged vertically side by side. The top sides of the two side sheets 1-3 are connected to each other through the top sheet 1-1, and the bottom sides of the two side sheets 1-3 are connected to each other through the two end sheets 1-4. The inner wall of the top sheet 1-1, the top wall of the bottom sheet 1-2, the inner walls of the two side sheets 1-3 and the inner walls of the two end sheets 1-4 enclose and form the elongated cavity 6.

[0022] The arc-shaped soft capsule 1 in this embodiment can have the following typical structural forms that combine flexibility and rigidity: The first type: the top sheet 1-1, bottom sheet 1-2 and two end sheets 1-4 are made of rigid materials, and the corresponding two side sheets 1-3 are flexible sheets, thus forming a composite structure that is rigid on all sides and flexible on the sides. This structure is beneficial for the sheeting process of this utility model, and can facilitate the smooth insertion of the arc-shaped soft capsule sheet 1 into all positions in the joint 11, which helps to reduce the grouting blind zone.

[0023] The second type: the top sheet 1-1 and the bottom sheet 1-2 are made of rigid materials, while the two end sheets 1-4 and the two side sheets 1-3 are flexible sheets, thus forming a composite structure that combines rigidity at the top and bottom and flexibility at the ends. This structure facilitates the unfolding of the sheet after the lowering process of this utility model, and allows the arc-shaped soft bladder sheet 1 to be attached to the side of the precast shield segment 10 that is close to it. It also facilitates the insertion of the arc-shaped soft bladder sheet 1 into the joint 11 to form a full-position coverage state, reducing the grouting blind zone.

[0024] The third type: The bottom sheet 1-2 is made of a rigid material, while the corresponding top sheet 1-1, two end sheets 1-4 and two side sheets 1-3 are all flexible sheets, thus forming a composite structure that is both rigid at the bottom and flexible at the top, ends and sides. This structure can only support the bottom side to assist in the sheet processing and reduce the grouting blind zone.

[0025] The fourth type: The bottom sheet 1-2 and the two side sheets 1-3 are made of rigid materials, while the corresponding top sheet 1-1 and the two end sheets 1-4 are flexible sheets, thus forming a composite structure that is rigid on the bottom and sides and flexible in other parts. This structure can only support the bottom side to assist in the sheet processing and reduce the grouting blind zone.

[0026] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 1 or 2. In this implementation method, the recessed part 4 is a strip-shaped notch, and an inverted U-shaped piece 7 is integrally connected in each strip-shaped notch. The inverted U-shaped piece 7 is a rigid piece, and an arc-shaped block 8 is provided on the inner wall of the arc end of the inverted U-shaped piece 7. The arc-shaped block 8 is an elastic block, preferably a rubber block, used to achieve buffering and contact with the corresponding bolt, so as to avoid damage to the bolt caused by falling foreign objects. When the arc-shaped soft bladder piece 1 is inserted into the joint 11 between two adjacent shield precast segments 10, the inverted U-shaped piece 7 is tightly attached to the bolt on the side of the shield precast segment 10 through the arc-shaped block 8.

[0027] Specific Implementation Method Four: This implementation method is a further limitation of Specific Implementation Methods One, Two, or Three. In this implementation method, the U-shaped piece 7 includes an arc-shaped piece 7-1 and two straight pieces 7-2. Each end of the arc-shaped piece 7-1 is integrally connected to a straight piece 7-2. Each straight piece 7-2 has an elongated hole 7-3 machined on it. The elongated hole 7-3 is connected to the elongated cavity 6, and the length direction of the elongated hole 7-3 is in the same direction as the length direction of the straight piece 7-2. The thickness of the U-shaped piece 7 is matched with the thickness of the arc-shaped soft capsule 1.

[0028] Specific Implementation Method 5: This implementation method is a further limitation of Specific Implementation Method 1, 2, 3 or 4. In this implementation method, the top piece 1-1 of the arc-shaped soft capsule 1 is machined with the mounting holes 3. The number of mounting holes 3 is matched with the number of water-stop needles 2. A sealing sleeve is fitted between the inner wall of the mounting hole 3 and the outer wall of the water-stop needle 2 to seal the coaxial connection between the two.

[0029] Combination Figure 5 As shown, an extension hose 13 is coaxially connected inside the mounting hole 3 to extend the grouting path of the water-stop needle 2, forming a grouting process from the bottom to the top of the arc-shaped soft bladder 1, which also helps to reduce the generation of grouting blind spots.

[0030] Furthermore, the extension hose 13 can be a construction hose made of existing flexible materials for conveying concrete or other high-strength slurries, or it can be a flat tube structure.

[0031] Specific Implementation Method Six: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four or Five. In this implementation method, a rigid guide strip 9 is provided at each end of the arc-shaped soft capsule 1. One side of each rigid guide strip 9 is fixedly connected to the outer wall of its corresponding end piece 1-4. The length of the rigid guide strip 9 is matched with the width of the arc-shaped soft capsule 1, that is, the length of the rigid guide strip 9 is greater than or equal to the width of the arc-shaped soft capsule 1. The rigid guide strip 9 is provided at the edge of the outer wall or side of the arc-shaped soft capsule 1 near the end, in order to strengthen the end strength of the arc-shaped soft capsule 1 and facilitate its insertion into the seam 11 for the lower piece processing.

[0032] Specific Implementation Method Seven: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four, Five, or Six. In this implementation method, each slurry outlet 5 includes a circular hole 5-1 and an extended slit 5-2, one end of which is connected to the circular hole 5-1. The extended slit 5-2 is a long and narrow straight slit used to expand the slurry outlet area of ​​the circular hole 5-1. When the side of the arc-shaped soft capsule 1 is a flexible structural component, the cooperation between the circular hole 5-1 and the extended slit 5-2 facilitates rapid slurry outlet or a rapid slurry outlet process. The circular hole 5-1 can be expanded outward with the cooperation of the extended slit 5-2 according to the slurry outlet intensity and flow rate.

[0033] The working process of this utility model: This utility model follows the core principle of grouting for the 10-segment splice joint of precast tunnel segments: with the goal of "sealing water and reinforcing", it adopts the process of "sealing the joint first, then grouting slowly under low pressure, and finally maintaining pressure and curing". It prioritizes the use of cement-water glass double liquid grout (for rapid water blocking), and uses epoxy grout to fill fine or dry joints to ensure that the joints are tight and leak-free.

[0034] One operation process of this utility model is as follows: First, clean the gaps: use a high-pressure air blower and a wire brush to remove debris and laitance from the gaps. If there is water seepage, install a drainage pipe to drain the water. Damp gaps need to be dried. Secondly, place the arc-shaped soft bladder 1 with multiple water-stop needles 2 in the joint 11. After placing the secondary grouting penetration plate for drainage pipe segments into the joint 11, apply water-stop strips or apply epoxy mortar to both sides of the joint 11 to seal it, ensuring that there is no leakage around the multiple water-stop needles 2. Then, layered grouting: the water-stop needle 2 is connected to the grout supply source, and the grout enters from the water-stop needle 2 and is injected at a low pressure of 0.3-0.8MPa. After the grout overflows from the adjacent water-stop needle 2, it is immediately sealed, and the pressure is continued to be increased for grouting. The grout collects in the narrow cavity 6 inside the arc-shaped soft bladder 1, and then flows out from each grout outlet 5 to each position of the joint 11.

[0035] Finally, pressure maintenance: After grouting, close the valve and maintain pressure for 5-10 minutes, then maintain pressure for 24-48 hours. After solidification, cut off each water-stop needle 2 and repair the surface with mortar.

[0036] Another operation of this utility model is that when the top of each water-stop needle 2 is lower than the top side height of the joint 11, the top side surface of the arc-shaped soft capsule 1 can be directly repaired with mortar, without cutting each water-stop needle 2.

Claims

1. A secondary grouting permeation sheet for use between drainage pipe segments, characterized in that: The device includes an arc-shaped soft bladder (1) and multiple water-stop needles (2). The unfolded shape of the arc-shaped soft bladder (1) is matched with the side shape of the precast tunnel segment (10). A narrow cavity (6) is formed inside the arc-shaped soft bladder (1). Multiple mounting holes (3) are machined on the top side of the arc-shaped soft bladder (1). A water-stop needle (2) is inserted into each mounting hole (3). The upper end of the water-stop needle (2) is the slurry inlet end. The lower end is the slurry release end. The lower end of the water-stop needle (2) is connected to the interior of the arc-shaped soft bag (1). The bottom side of the arc-shaped soft bag (1) is processed with multiple recesses (4). Each recess (4) is corresponding to a bolt on the side of the shield precast segment (10). The arc-shaped soft bag (1) is processed with multiple slurry outlet holes (5) along its thickness direction. Each slurry outlet hole (5) is connected to the narrow cavity (6) of the arc-shaped soft bag (1).

2. The secondary grouting permeation sheet for drainage pipe segments according to claim 1, characterized in that: The recess (4) is a strip-shaped notch, and an inverted U-shaped piece (7) is integrally connected in each strip-shaped notch. An arc-shaped block (8) is provided on the inner wall of the arc end of the inverted U-shaped piece (7). When the arc-shaped soft bladder piece (1) is inserted into the joint (11) between two adjacent shield precast segments (10), the inverted U-shaped piece (7) is tightly attached to the bolt on the side of the shield precast segment (10) through the arc-shaped block (8).

3. A secondary grouting permeation sheet for drainage pipe segments according to claim 2, characterized in that: The U-shaped piece (7) includes an arc-shaped piece (7-1) and two straight pieces (7-2). Each end of the arc-shaped piece (7-1) is integrally connected to a straight piece (7-2). Each straight piece (7-2) has an elongated hole (7-3) machined on it. The elongated hole (7-3) is connected to the elongated cavity (6). The length direction of the elongated hole (7-3) is the same as the length direction of the straight piece (7-2).

4. A secondary grouting permeation sheet for drainage pipe segments according to claim 1, characterized in that: The arc-shaped soft capsule (1) includes a top piece (1-1), a bottom piece (1-2), two side pieces (1-3) and two end pieces (1-4). The two side pieces (1-3) are arranged vertically side by side. The top sides of the two side pieces (1-3) are connected by the top piece (1-1), and the bottom sides of the two side pieces (1-3) are connected by the bottom piece (1-2). The two ends of one side piece (1-3) are connected to the two ends of the other side piece (1-3) by the two end pieces (1-4). The inner wall of the top piece (1-1), the top wall of the bottom piece (1-2), the inner walls of the two side pieces (1-3) and the inner walls of the two end pieces (1-4) enclose the elongated cavity (6).

5. A secondary grouting permeation sheet for drainage pipe segments according to claim 4, characterized in that: A rigid guide strip (9) is provided at each end of the arc-shaped soft capsule (1). One side of each rigid guide strip (9) is fixedly connected to the outer wall of its corresponding end piece (1-4). The length of the rigid guide strip (9) is matched with the width of the arc-shaped soft capsule (1).

6. A secondary grouting permeation sheet for drainage pipe segments according to claim 1, characterized in that: Each discharge hole (5) includes a circular hole (5-1) and an extended slit (5-2), one end of which is connected to the circular hole (5-1).

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