A secondary receiving water-stop sealing system and method for a shield tunneling machine to break through the launch shaft

Abstract

The present invention relates to the technical field of shield tunneling construction, and particularly relates to a secondary receiving water-stop sealing system and method for shield tunneling. The water-stop sealing system includes two rings of bases fixed to the inner side of the portal steel ring. One ring of spring steel plates is fixedly installed on each ring of bases. A filling material is filled between the two rings of spring steel plates. The two rings of spring steel plates and the filling material form a sealing body, and the sealing body is used to block the gap between the shield body and the portal steel ring. By arranging two rings of spring steel plates along the axial direction of the shield machine and filling the filling material between the two rings of spring steel plates, the present invention forms an overall sealing body structure. Utilizing the high strength and high elasticity of the spring steel plates, the gaps existing between the shield body, the segment and the portal are blocked, preventing water gushing and sand gushing, and controlling the ground settlement caused by the gap between the shield body and the formation. Moreover, the secondary receiving water-stop sealing system for shield tunneling of the present invention has a simple structure, is convenient for installation, and has a low construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling construction, in particular to a secondary receiving water-stop sealing system and method for shield tunneling out of the shaft. Background Art

[0002] During the process of shield machine receiving out of the shaft, there will be certain gaps between the shield body and the portal, and between the segment and the portal. When the shield machine receives in some shallow-buried environments that are sensitive to surface settlement, due to the existence of these two types of gaps, it may lead to water and sand gushing from the gaps and surface settlement. The settlement amount generated cannot be ignored, and in severe cases, certain safety hazards will occur. Most of the current methods for blocking these gaps are a fan-shaped pressing plate and a rubber curtain, and the effect is not very ideal. Therefore, there is an urgent need to invent a system that can seal the gaps between the shield body, the segment and the portal. Summary of the Invention

[0003] The purpose of the present invention is to provide a secondary receiving water-stop sealing system and method for shield tunneling out of the shaft to block the gaps existing between the shield body, the segment and the portal, aiming at the problems of water and sand gushing and surface settlement risks caused by the gaps existing between the shield body, the segment and the portal during the receiving process of the shield machine in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A secondary receiving water-stop sealing system for shield tunneling out of the shaft includes two circles of bases fixed on the inner side of the portal steel ring. A circle of spring steel plates is fixedly installed on each circle of bases. The space between the two circles of spring steel plates is filled with a filler. The two circles of spring steel plates and the filler form a sealing body, and the sealing body is used to block the gap between the shield body and the portal steel ring.

[0006] The present invention forms an overall sealing body structure by arranging two circles of spring steel plates along the axial direction of the shield machine and filling the filler between the two circles of spring steel plates. Utilizing the high strength and high elasticity of the spring steel plates, the gaps existing between the shield body, the segment and the portal are blocked to prevent water and sand gushing and control the ground settlement caused by the gap between the shield body and the formation. Moreover, the secondary receiving water-stop sealing system of the present invention has a simple structure, is convenient for installation, and has a low construction cost.

[0007] As a preferred solution of the present invention, the tensile strength of the spring steel plate ≥ 1275 MPa, the Rockwell hardness of the spring steel plate ≥ HRC40, and the number of repeated bending times of the spring steel plate ≥ 22 times.

[0008] As a preferred solution of the present invention, the distance between the two circles of spring water-stop steel plates ≥ 8 cm, and the distance between the spring water-stop steel plate and the edge of the portal steel ring ≥ 25 cm.

[0009] As a preferred embodiment of the present invention, the filler is a sponge strip or a foam strip.

[0010] As a preferred embodiment of the present invention, it further includes a first circular arc steel plate fixed inside the portal steel ring, and the first circular arc steel plate is used to seal the gap between the portal steel ring and the front shield.

[0011] As a preferred embodiment of the present invention, it further includes a second circular arc steel plate fixed inside the first circular arc steel plate, and the second circular arc steel plate is used to seal the gap between the portal steel ring and the segment.

[0012] As a preferred embodiment of the present invention, the first circular arc steel plate and the second circular arc steel plate are both provided with polyurethane injection ball valve interfaces.

[0013] The present invention also discloses a secondary receiving water-stop sealing method for a shield tunneling machine, including the following steps:

[0014] Step 1: When the cutter head of the shield tunneling machine reaches the diaphragm wall, perform the ring seal of the segments behind the tail shield, and open the ball valve inside the tail shield to check the ring seal effect;

[0015] Step 2: After confirming that the ring seal is good, weld the first circle of base at a distance of 25 - 40 cm from the edge of the portal steel ring, weld the second circle of base at a distance of 8 - 15 cm from the first circle of base, then install the spring steel plate on the base, and fill the gap between the two circles of spring steel plates with a sponge strip to seal the gap between the shield body and the portal steel ring;

[0016] Step 3: Demolish the diaphragm wall, and weld the first circular arc steel plate when the edge of the front shield of the cutter head exits the portal end face to seal the gap between the portal steel ring and the shield body;

[0017] Step 4: Continue to advance and assemble, and weld the second circular arc steel plate when the tail shield is pulled out of the portal to seal the gap between the portal and the steel ring segment.

[0018] The present invention adopts a secondary water-stop and plugging design to seal the gaps between the shield body, the segments and the portal, and combines the secondary grouting ring seal technology (sealing grouting) between the segments behind the tail shield and the tunnel wall. Basically, there will be no phenomena of water seepage, water leakage, water gushing, and sand gushing during the receiving process, which can effectively optimize the construction process, reduce the construction steps, and thus ensure the safe receiving of the shield tunneling machine.

[0019] As a preferred embodiment of the present invention, it further includes Step 5: Connect an injection pipeline to the polyurethane injection ball valves of the first circular arc steel plate and the second circular arc steel plate to inject polyurethane for plugging.

[0020] As a preferred embodiment of the present invention, in Step 1, the base is strengthened and fixed by triangular gusset plates.

[0021] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0022] 1. By arranging two circles of spring steel plates along the axial direction of the shield machine and filling fillers between the two circles of spring steel plates, an overall sealed body structure is formed. Utilizing the high strength and high elasticity of the spring steel plates, the gaps existing between the shield body, the segment and the portal are blocked, preventing water gushing and sand gushing, and controlling the ground settlement caused by the gap between the shield body and the formation. Moreover, the secondary receiving water-stop sealing system of the shield machine described in the present invention has a simple structure, is convenient for installation, and has a relatively low construction cost.

[0023] 2. The present invention adopts a secondary water-stop plugging design to block the gap between the shield body, the segment and the portal. Combining with the secondary grouting ring sealing technology (plugging grouting) between the segment behind the tail shield and the tunnel wall, water seepage, water leakage, water gushing and sand gushing phenomena basically do not occur during the receiving process, which can effectively optimize the construction process, reduce construction steps, and thus ensure the safe receiving of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic installation diagram of the base and the spring steel plate described in the present invention.

[0025] Figure 2 It is a schematic installation diagram of the first arc-shaped steel plate described in the present invention.

[0026] Figure 3 It is a schematic installation diagram of the second arc-shaped steel plate described in the present invention.

[0027] Figure 4 It is a schematic structural diagram of the base described in the present invention.

[0028] Figure 5 It is a schematic structural diagram of the spring steel plate described in the present invention.

[0029] Figure 6 It is a schematic structural diagram of the first arc-shaped steel plate described in the present invention.

[0030] Figure 7 It is a schematic structural diagram of the second arc-shaped steel plate described in the present invention.

[0031] Reference numerals: 1 - portal steel ring, 2 - base, 3 - spring steel plate, 4 - first arc-shaped steel plate, 5 - cutter head, 6 - second arc-shaped steel plate, 7 - segment. DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings.

[0033] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] Embodiment 1

[0035] As Figures 1 - 3 shown, a secondary receiving water-stop sealing system for a shield tunneling machine out of the hole includes a base 2, a spring steel plate 3, a first arc-shaped steel plate 4 and a second arc-shaped steel plate 6.

[0036] The base 2 is a two-ring annular structure, and the two rings of the base 2 are arranged at intervals along the axial direction of the shield machine. The base 2 is welded to the inner side of the portal steel ring 1. Specifically, the first ring of the base 2 is welded at a distance of 35 cm from the edge of the portal steel ring 1, and the second ring of the base 2 is welded at a distance of 10 cm from the first ring of the base 2, and the base 2 is strengthened and fixed by triangular gusset plates.

[0037] As Figure 4 shown, the base 2 is made of 8-mm-thick steel plate, with a height of 100 mm, a total of one full ring, evenly divided into 16 pieces, each piece being 22.5 degrees. The total demand in this embodiment is 2 rings and 32 pieces.

[0038] As Figure 1 shown, a ring of spring steel plates 3 is fixedly installed on each ring of the base 2, and a sponge strip is stuffed between the two rings of spring steel plates 3 for sealing the gap between the shield body and the portal steel ring. The tensile strength of the spring steel plate is ≥1275 MPa, the Rockwell hardness of the spring steel plate is ≥HRC40, and the number of repeated bends of the spring steel plate is ≥22 times.

[0039] As Figure 5 shown, the spring steel plate 3 is made of 1-mm-thick steel plate, with a jaw radius of 8 mm, a total of one full ring. When installed, every two pieces overlap by 2 cm, and there are about 130 pieces in one ring. The total demand in this embodiment is 2 rings and 260 pieces.

[0040] As Figure 2 shown, the first arc-shaped steel plate 4 is welded to the inner side of the portal steel ring 1 and overlaps with the portal steel ring 1 by 10 cm for sealing the gap d1 between the portal steel ring and the front shield. The first arc-shaped steel plate 4 is welded with a polyurethane injection ball valve interface.

[0041] As Figure 6 shown, the first arc-shaped steel plate 4 is made of 10-mm-thick steel plate, a total of one full ring, evenly divided into 36 pieces, each piece being 10 degrees. The total demand in this embodiment is 1 ring and 36 pieces.

[0042] As Figure 3As shown in the figure, the second arc-shaped steel plate 6 is welded to the inner side of the first arc-shaped steel plate 4, overlapping and welding with the first arc-shaped steel plate 4 for 5 cm. The second arc-shaped steel plate 6 is used to seal the gap d2 between the portal steel ring and the segment 7. The second arc-shaped steel plate 6 is welded with a polyurethane injection ball valve interface.

[0043] As Figure 7 shown, the second arc-shaped steel plate 6 is made of 10-mm thick steel plate, with a total of one full ring, evenly divided into 18 pieces, each piece being 20 degrees. The total demand in this embodiment is 18 pieces in one circle.

[0044] Embodiment 2

[0045] A method for water-stop sealing during the secondary reception of a shield tunneling machine uses the water-stop sealing system for the secondary reception of a shield tunneling machine described in Embodiment 1, and includes the following steps:

[0046] Step 1: When the cutter head 5 of the shield tunneling machine reaches the diaphragm wall, perform circumferential sealing of the segments behind the tail shield, and open the ball valve inside the tail shield to check the circumferential sealing effect;

[0047] Step 2: After confirming good circumferential sealing, weld the first ring of pedestals 2 at a distance of 35 cm from the edge of the portal steel ring 1, weld the second ring of pedestals 2 at a distance of 10 cm from the first ring of pedestals 2, strengthen and fix the pedestals 2 through triangular gusset plates, then install the spring steel plates 3 on the pedestals, and stuff the gap between the two rings of spring steel plates 3 with sponge strips to seal the gap between the shield body and the portal steel ring;

[0048] Step 3: Manually break the diaphragm wall, and weld the first arc-shaped steel plate 4 when the front edge of the cutter head 5 exits the end face of the portal before the shield exits the hole to seal the gap d1 between the portal steel ring and the shield body;

[0049] Step 4: Continue to push and assemble, and weld the second arc-shaped steel plate 6 when the tail shield is pulled out of the portal to seal the gap d2 between the portal and the steel ring segment 7;

[0050] Step 5: If there is still a small amount of water seepage or leakage during the reception process, connect the injection pipeline to the polyurethane injection ball valves on the first arc-shaped steel plate 4 and the second arc-shaped steel plate 6 to inject polyurethane for sealing.

[0051] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A secondary receiving water-stop sealing system for shield tunneling out of the shaft, Characterized in that, It includes two circles of bases fixed on the inner side of the portal steel ring. A circle of spring steel plates is fixedly installed on each circle of bases. The space between the two circles of spring steel plates is filled with fillers. The two circles of spring steel plates and the fillers form a sealing body, and the sealing body is used to block the gap between the shield body and the portal steel ring. It also includes a circle of first arc-shaped steel plates fixed on the inner side of the portal steel ring. The first arc-shaped steel plates are welded when the edge of the cutter head exits the end face of the portal before the shield exits the shaft. The first arc-shaped steel plates overlap with the portal steel ring, and the first arc-shaped steel plates are used to block the gap between the portal steel ring and the front shield. It also includes a circle of second arc-shaped steel plates fixed on the inner side of the first arc-shaped steel plates. The second arc-shaped steel plates are welded after the tail shield is pulled out of the portal. The second arc-shaped steel plates overlap with the first arc-shaped steel plates, and the second arc-shaped steel plates are used to block the gap between the portal steel ring and the segment. Both the first arc-shaped steel and the second arc-shaped steel plates are provided with polyurethane injection ball valve interfaces.

2. A secondary receiving water-stop sealing system for shield tunneling out of the shaft according to claim 1, Characterized in that, The tensile strength of the spring steel plate is ≥1275 MPa, the Rockwell hardness of the spring steel plate is ≥HRC40, and the number of repeated bends of the spring steel plate is ≥22 times.

3. A secondary receiving water-stop sealing system for shield tunneling out of the shaft according to claim 1, Characterized in that, The distance between the two circles of spring steel plates is ≥8 cm, and the distance between the spring steel plate and the edge of the portal steel ring is ≥25 cm.

4. A secondary receiving water-stop sealing system for shield tunneling out of the shaft according to claim 1, Characterized in that, The filler is a sponge strip or a foam strip.

5. A secondary receiving water-stop sealing method for shield tunneling out of the shaft, Characterized in that, Install and use the secondary receiving water-stop sealing system for shield tunneling out of the shaft according to any one of claims 1-4, including the following steps: Step 1: When the cutter head of the shield machine reaches the diaphragm wall, perform ring sealing on the segments behind the tail shield, and open the ball valve inside the shield tail to check the ring sealing effect. Step 2: After confirming good ring sealing, weld the first circle of bases at a distance of 25-40 cm from the edge of the portal steel ring, weld the second circle of bases at a distance of 8-15 cm from the first circle of bases, then install the spring steel plates on the bases, and fill the space between the two circles of spring steel plates with sponge strips to block the gap between the shield body and the portal steel ring. Step 3: Break the diaphragm wall, the cutter head exits the shaft, and weld the first arc-shaped steel plates when the edge of the front shield exits the end face of the portal to block the gap between the portal steel ring and the shield body. Step 4: Continue to push and assemble. When the tail shield is pulled out of the portal, weld the second arc-shaped steel plates to block the gap between the portal steel ring and the segments. Step 5: Connect the injection pipelines to the polyurethane injection ball valves on the first arc-shaped steel plates and the second arc-shaped steel plates and inject polyurethane for plugging.

6. A secondary receiving water-stop sealing method for shield tunneling out of the shaft according to claim 5, Characterized in that, In the step 1, the bases are strengthened and fixed by triangular rib plates.

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