Water stop type shield steel ring

Abstract

The utility model relates to the field of shield tunnel construction water stopping structures, and discloses a water stopping type shield steel ring which is formed by splicing arc-shaped ring plates, and reinforcing plates are vertically welded in the annular direction of the outer arc surfaces of the arc-shaped ring plates. The utility model aims to overcome the weakness between the shield steel ring and the end wall, effectively improve the water stop effect, reduce the overhaul and operation maintenance cost, save the project maintenance cost and prolong the service life of equipment in a hole; the strength, rigidity and stability of the steel ring are improved; and meanwhile, the water and soil loss path behind is effectively prolonged, the water stopping effect is improved under the condition that dynamic loads continuously exist in the later period, and the threats to ground buildings and underground pipelines caused by overhaul, pumping drainage, operation maintenance, corrosion of equipment in a hole and ground surface settlement in the follow-up process due to the water leakage risk are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of water-stopping structures for shield tunnel construction, in particular to a water-stopping shield steel ring. Background Art

[0002] In shield tunnel construction, the manufacturing and installation accuracy of the shield steel ring not only affects the position of the shield machine in and out of the tunnel, but also has important significance for protecting the soil and water loss of the tunnel entrance during the start and reception. The start and reception of the shield machine is the most critical link in shield construction, which plays a decisive role in the success or failure of this project. Shield start refers to a series of operations in which the shield machine on the starting base is pushed into the end reinforcement soil in the shield starting working shaft using equipment or facilities such as reaction frames and temporarily assembled negative ring segments, and then enters the original soil section of the stratum and excavates along the designed route.

[0003] During the start-up process of the shield machine, water stopping of the start-up tunnel is a very important part. Under poor geological conditions, water seepage, soil loss and foundation pit collapse are prone to occur. At present, in the construction of similar shield steel rings, Q235 steel plates with a thickness of 10 mm are generally used to splice into a circular ring that meets the design size, and the tunnel opening seal is installed before starting.

[0004] Generally, the size of the shield starting and receiving reserved openings is slightly larger than the design size to ensure that the shield machine has enough starting and receiving space. Synchronous grouting, secondary grouting and water blocking grouting (in water-rich areas) will be carried out behind the shield segments to solve the soil loss and water leakage behind the segments; after the shield excavation construction is completed, the hole body needs to be post-cast with a ring beam to prevent the mud and water in the building gap from entering the main structure, which plays a waterproof role. However, the shield steel ring and the end wall are weak points. The large increase in track operation load in the later period causes the mud and water behind the structure to leak under pressure. For the facilities and equipment attached to the tunnel, the leakage will accelerate the corrosion of the equipment, causing equipment failure and affecting its service life; for the outside of the tunnel, long-term leakage will cause surface settlement and threaten ground buildings and underground pipelines.

[0005] The Chinese invention patent with patent number CN 208473896 U discloses a waterproof steel ring device for shield machine start-up. Through multiple water-stop steel wire sealing brushes and waterproof rubber curtains combined with grouting, it ensures that the tunnel door is sealed and leak-proof when the shield machine starts, and can quickly build up soil pressure in the soil bin, ensuring the safety of shield machine start-up.

[0006] The devices in the above-mentioned comparative documents have the following points that need to be improved:

[0007] The area between the shield steel ring and the end wall is a weak point. The subsequent increase in track operation load caused mud and water behind the structure to leak under pressure. For facilities and equipment attached to the tunnel, the leakage will accelerate equipment corrosion, leading to equipment failure and affecting its service life. For the outside of the tunnel, long-term leakage will cause surface subsidence and pose a threat to ground buildings and underground pipelines. Utility Model Content

[0008] In view of the above-mentioned problems, the utility model aims to provide a water-stopping shield steel ring, which can overcome the weak points between the shield steel ring and the end wall, so that even if the track running load increases significantly in the later stage, the mud and water behind the structure will not leak under the action of pressure.

[0009] The main idea of ​​the technical solution adopted by the utility model is: to set a reinforcing plate welded vertically in an annular direction on the outer arc surface of the arc-shaped ring plate to overcome the weak points between the shield steel ring and the end wall, effectively improve the water-stopping effect, and increase the service life of the equipment in the tunnel; increase the strength, rigidity and stability of the steel ring; at the same time, effectively extend the soil erosion path behind it, improve the water-stopping effect when the dynamic load continues to exist in the later stage, and effectively reduce the subsequent inspection, pumping, operation and maintenance, corrosion of equipment in the tunnel, surface subsidence, and threats to ground buildings and underground pipelines caused by the risk of water leakage.

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0011] The utility model relates to a water-stop shield steel ring, which is formed by splicing a plurality of arc-shaped ring plates, and a reinforcing plate is welded vertically along the outer arc surface of the arc-shaped ring plate.

[0012] In the above solution, the reinforcing plate is arranged in the middle of the arc-shaped ring plate, and supporting components perpendicular to the reinforcing plate and the arc-shaped ring plate are respectively arranged on both sides of the reinforcing plate.

[0013] In the above scheme, there are at least two reinforcing plates with corresponding spacing, which are arranged in the middle of the arc-shaped ring plate; the two reinforcing plates have different widths; and a supporting component perpendicular to the reinforcing plates is arranged between the reinforcing plates.

[0014] In some embodiments, the supporting member is a polygonal steel plate extending along the width direction of the reinforcing plate.

[0015] In the above scheme, the arc-shaped ring plate includes a folding plate located at the top end of the arc-shaped ring plate, and connecting plates located at the left and right ends of the arc-shaped ring plate.

[0016] In some embodiments, the folding plate is provided with grouting holes distributed at equal intervals; the connecting plate is respectively provided with a plurality of connecting holes for bolts to pass through, and a plurality of ribs are provided between the connecting plate and the arc-shaped ring plate.

[0017] The beneficial effect of the utility model is as follows: compared with the prior art, the improvement of the utility model lies in that, by arranging a reinforcing plate welded vertically in an annular direction on the outer arc surface of the arc-shaped steel plate, the weak point between the shield steel ring and the end wall can be overcome, the water-stopping effect can be effectively improved, the inspection and operation and maintenance costs can be reduced, the engineering maintenance costs can be saved, and the service life of the equipment in the tunnel can be increased; during the construction process, the installation is convenient and quick; the strength, rigidity and stability of the steel ring are also increased; at the same time, the soil erosion path behind it is effectively extended, and the water-stopping effect is improved when the dynamic load continues to exist in the later stage, and the subsequent inspection, pumping, operation and maintenance, corrosion of equipment in the tunnel, surface subsidence, and threats to ground buildings and underground pipelines caused by the risk of water leakage are effectively reduced; and the structure is simple, the engineering application range is wide, the cost is low, and the installation efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of Example 1 of the utility model.

[0019] Figure 2 This is a schematic diagram of the structure of Example 1 of the utility model.

[0020] Figure 3 This is a schematic structural diagram of the reinforcement plate of Example 1 of the utility model.

[0021] Figure 4 This is a schematic diagram of the structure of Example 2 of the utility model.

[0022] Figure 5 This is a schematic structural diagram of the reinforcement plate of Example 2 of the utility model.

[0023] Among them: 1. arc-shaped ring plate, 2. reinforcement plate, 3. supporting component, 4. folding plate, 5. connecting plate, 6. grouting hole, 7. connecting hole, 8. rib plate. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0025] refer to Figure 1-3 The present application discloses a water-stop shield steel ring, which is composed of a plurality of arc-shaped ring plates 1; a reinforcing plate 2 is welded vertically along the outer arc surface of the arc-shaped steel plate 1. Figure 2As shown, the reinforcing plate 2 is arranged in the middle of the arc ring plate 1, which increases the close contact between the arc ring plate 1 and the end wall. The reinforcing plate 2 uses a steel plate of the same specification and model as the arc steel plate 1. Its specific data is determined according to the thickness of the protective layer of the reserved opening in the design, so as not to affect the construction of the steel bars behind. By setting the reinforcing plate 2, the weak point between the shield steel ring and the end wall can be overcome, and the water-stopping effect can be effectively improved.

[0026] like Figure 3 As described above, support components 3 perpendicular to the reinforcing plate 2 and the arc-shaped ring plate 1 are respectively provided on both sides of the reinforcing plate 2. The support component 3 is a polygonal steel plate extending along the width direction of the reinforcing plate, preferably a right triangle or a rectangle. The thickness of the polygonal steel plate is 5mm to 10mm, and the single-side width is adapted to the reinforcing plate 2 and the arc-shaped ring plate 1. The support component 3 increases the stability of the reinforcing plate 2 and the arc-shaped ring plate 1, avoids deformation, and is placed in the concrete to improve strength during pouring.

[0027] The arc ring plate 1 includes a folding plate 4 located at the top of the arc ring plate 1 and connecting plates 5 located at the left and right ends of the arc ring plate 1. The folding plate 4 is provided with grouting holes 6 distributed at equal intervals; the connecting plate 5 is respectively provided with a number of connecting holes 7 for bolts to pass through, and a number of ribs 8 are provided between the connecting plate 5 and the arc ring plate 1. The sealing between the shield steel ring and the concrete is effectively improved to achieve a water-stopping effect; and during the construction process, the installation is convenient and quick, which greatly improves the installation efficiency.

[0028] Adjacent arc-shaped ring plates 1 are fitted together and fixedly connected by bolts and nuts to stabilize the arc-shaped ring plates 1 and prevent the arc-shaped ring plates 1 from shifting. The rib plate 8 is a right-angled triangular steel plate, and the two right-angled sides are welded to the arc-shaped ring plates 1 and the connecting plate 5 respectively, further improving the strength of the arc-shaped ring plates 1.

[0029] Generally, a tunnel with a diameter of Φ5400mm is assembled into a shield steel ring by 6 arc-shaped ring plates 1, the arc-shaped ring plate 1 is 300mm thick and 1200mm (or 1500mm) wide, and the diameter of the connecting hole 7 of the arc-shaped ring plate 1 with a width of 1200mm is Φ30mm.

[0030] The specific construction process of this embodiment is as follows:

[0031] The shield machine mainly relies on the VMT guide system and other systems for automatic positioning and guidance. After the shield machine has advanced 1.5 meters, it stops excavating, retracts the jack, and uses an assembling machine to assemble the arc-shaped ring plate 1 into a ring.

[0032] During the shield tunneling process, the shield tail gap outside the assembled arc ring plate 1 is filled with synchronous grouting to prevent surface settlement. The arc ring plate 1 is generally assembled in accordance with the process of first down and then up, staggered left and right, longitudinally inserted, and capped into a ring.

[0033] When installing the arc ring plate 1, remove the debris near the assembly surface, retract the jacks at the corresponding positions according to the positions of each arc ring plate 1, form a bottled space for the arc ring plate 1, put the arc ring plate 1 in place, and then re-extend the jack to complete the assembly of one arc ring plate 1; after the arc ring plate 1 is aligned, connect it with bolts, tighten the bolts with a pneumatic wrench or a manual wrench, and reach the required torque; finally, send the sealing block arc ring plate 1 into place, first insert it radially, then push it into the ring longitudinally, make a circular ring correction, and conduct a comprehensive inspection; when assembling the arc ring plates 1 piece by piece, pay attention to ensure that the ring surfaces of the joints of the two adjacent segments are flat, the inner arc surface is flat, the end faces of the longitudinal seams of the segments are close, and the bolts are tight. The hole positions are aligned, and it is easy for the bolts to be inserted into the connecting holes 7; after the assembly is completed, when the next ring is excavated 10-20cm, use a pneumatic wrench or a manual wrench to tighten the bolts in the longitudinal order from the first ring to the back. When the next ring is excavated and before assembly, the bolts of the arc ring plate 1 within the range of the 3 adjacent rings that have been formed should be re-tightened to make the torque of the bolts meet the design requirements; after the arc ring plate 1 is separated from the tail shield, the connecting bolts of the arc ring plate 1 are tightened for the second time, and tightened at any time; after the installation of the arc ring plate 1 is completed, the deformation of the arc ring plate 1 is corrected in time, and the re-tightening and re-inspection of the bolts are strengthened; insist on re-tightening the bolts of the arc ring plate 1 three times and re-inspecting after the platform car is removed.

[0034] When synchronous grouting is performed behind the wall, grouting is performed through the grouting holes 6 reserved on the folding plate 4, starting after 10 cm of excavation and stopping 10 cm before the excavation is completed; the grouting pressure is mostly 0.2~0.4MPa based on previous construction experience, but it is necessary to set the pressure required to fully fill the wall thickness gap based on the strength of the arc ring plate 1, soil pressure, water pressure and water and soil pressure, and at the same time, the pressure should be evenly applied to the entire arc ring plate 1. The grouting pressure can be roughly equal to the bottom resistance strength (pressure) + 0.1 to 0.2MPa; considering The permeability of the grouting material and the surrounding rock, the pressure into the surrounding rock caused by pressurization, drainage consolidation, over-excavation and other reasons, the actual grouting volume often reaches 130%-180% of the theoretical grouting volume; the synchronous grouting speed should match the excavation speed, and the average grouting speed should be determined by completing the ring grouting for each ring of shield excavation; the standard of the end of the control is controlled by the dual indicators of grouting pressure and grouting volume: It is generally believed that when the grouting pressure reaches the set value and the grouting volume reaches more than 85% of the design value, it is considered that the quality requirements have been met. When the geological conditions are special, it is determined according to the actual conditions. During the shield construction process, secondary grouting is carried out according to the actual section according to the monitored ground settlement, water leakage of the arc ring plate 1, special sections, etc.; the slurry is injected through the grouting holes 6 reserved on the folding plate 4. Example 2

[0035] The structures of the water-stop shield steel ring in this embodiment and in embodiment 1 are the same, except that Figure 4 , 5As shown, there are at least two reinforcing plates 2 with corresponding spacing, which are arranged in the middle of the arc-shaped ring plate 1; the two reinforcing plates 2 have different widths, one of which is 30-40 mm wide, and the other is 50-60 mm wide, so that the arc-shaped ring plate 1 and the end wall are in closer contact at different depths; its specific data is determined according to the thickness of the reserved hole protection layer in the design, so as not to affect the construction of the steel bars behind. A supporting component 3 perpendicular to the reinforcing plate 2 is provided between the reinforcing plates 2. The rigidity, strength and stability of the water-stop steel ring are further increased; the water and soil erosion path behind is effectively extended, and the water-stop effect is improved when the dynamic load continues to exist in the later stage; the subsequent inspection, drainage, operation and maintenance, equipment corrosion in the tunnel, surface settlement, and threats to ground buildings and underground pipelines caused by the risk of water leakage are effectively reduced.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A water-stop shield steel ring, the shield steel ring being formed by splicing a plurality of arc-shaped ring plates (1), characterized in that: A reinforcing plate (2) is welded vertically in the circumferential direction along the outer arc surface of the arc-shaped annular plate (1).

2. A water-stop shield steel ring according to claim 1, characterized in that: The reinforcing plate (2) is arranged in the middle of the arc-shaped ring plate (1), and supporting components (3) perpendicular to the reinforcing plate (2) and the arc-shaped ring plate (1) are respectively arranged on both sides of the reinforcing plate (2).

3. The water-stop shield steel ring according to claim 1, characterized in that: There are at least two reinforcing plates (2) with corresponding spacing, which are arranged in the middle of the arc-shaped ring plate (1); the two reinforcing plates (2) have different widths; and a supporting component (3) perpendicular to the reinforcing plates (2) is arranged between the reinforcing plates (2).

4. A water-stop shield steel ring according to claim 2 or 3, characterized in that: The supporting component (3) is a polygonal steel plate extending along the width direction of the reinforcing plate (2).

5. The water-stop shield steel ring according to claim 1, characterized in that: The arc-shaped ring plate (1) comprises a folding plate (4) located at the top end of the arc-shaped ring plate (1), and connecting plates (5) located at the left and right ends of the arc-shaped ring plate (1).

6. The water-stop shield steel ring according to claim 5, characterized in that: The folded plate is provided with grouting holes (6) distributed at equal intervals; the connecting plate (5) is respectively provided with a plurality of connecting holes (7) for bolts to pass through, and a plurality of ribs (8) are provided between the connecting plate (5) and the arc-shaped ring plate (1).

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