Ultra-deep underground diaphragm wall and construction method

Abstract

The invention relates to an ultra-deep underground diaphragm wall and a construction method, the problem that a three-shaft mixing pile is high in strength and hard on one side and soft on the other side and is difficult to correct is solved by using a cylindrical rotary drilling bit with side cutting teeth, so that the perpendicularity of a groove section meets the design requirement, and the subsequent construction quality is prevented from being influenced; in the construction process, the guide wall steel formwork can be accurately adjusted and fixed through the screw rods and the adjusting nuts on the steel formwork; the combined water stop component is used for conducting waterproof construction on the underground diaphragm wall at the construction joint, on the basis that the bearing performance of the underground diaphragm wall structure is guaranteed, the problem that the waterproof performance of the underground diaphragm wall at the construction joint is difficult to guarantee is solved, and the overall construction quality of the underground diaphragm wall is improved.

Description

Technical Field

[0001] The invention belongs to the field of underground continuous wall construction, and in particular relates to an ultra-deep underground continuous wall and a construction method. Background Art

[0002] As a common construction method in modern urban underground structures, underground continuous walls have been widely used in various underground projects in recent years. Underground continuous walls have the advantages of low construction vibration, high wall stiffness, good anti-seepage performance, and adaptability to various foundation conditions. They are especially suitable for complex engineering environments such as deep foundation pit support and reverse construction. However, as the construction conditions of applied projects become more and more complex, traditional underground continuous strong construction technology often faces problems such as low construction efficiency, poor water-stopping effect, and wall verticality that does not meet the requirements during its application. These problems will have a great impact on the overall quality and safety of the project.

[0003] Therefore, it is of great significance to study ultra-deep underground continuous walls and construction methods. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an ultra-deep underground continuous wall and a construction method.

[0005] This ultra-deep underground continuous wall construction system includes an integrated steel formwork for the guide wall, a combined water-stopping component, a reel and a double-wheel slot milling machine;

[0006] The combined water-stopping component is installed between the guide walls. The combined water-stopping component includes an outer H-shaped steel pile and a polygonal pipe pile. An open steel groove is provided on the side of the outer H-shaped steel pile facing the polygonal pipe pile. The polygonal pipe pile is connected with the open steel groove through the main rib plate.

[0007] The reel is used to synchronously attach the HDPE anti-seepage membrane when the steel cage of the ground-connected wall is lowered; a high-pressure brushing device is installed at the bottom of the double-wheel milling machine.

[0008] Preferably, the integrated steel formwork includes a steel formwork and an inner support, wherein the inner support is arranged between the steel formworks, and a plurality of formwork connecting holes are arranged on the sides of the steel formwork along the length direction of the guide wall. The steel formwork is fixed with a screw by welding through a bottom connecting plate, and an adjusting nut is provided on the screw. The inner support includes a vertical support steel pipe and a horizontal support steel pipe, wherein the vertical support steel pipe is arranged on both sides of the inner support and has screw holes reserved therefor, and the screws pass through the screw holes to connect the steel formwork and the inner support to form an integrated steel formwork.

[0009] Preferably, the combined water-stop component includes an outer H-shaped steel pile, an open steel trough, an inner H-shaped steel pile, a polygonal pipe pile, a side rib plate and a main rib plate. The inner H-shaped steel pile is arranged in the polygonal pipe pile, and the interior of the polygonal pipe pile is filled with fine stone concrete; the side rib plates are symmetrically welded and arranged on the outside of the polygonal pipe pile with the center line of the polygonal pipe pile as the axis of symmetry, and the main rib plates are arranged horizontally on both sides along the center line of the polygonal pipe pile; the open steel trough is arranged with the outer H-shaped steel pile facing the side of the polygonal pipe pile, and the end of the main rib plate is inserted in the open steel trough to realize the connection between the polygonal pipe pile and the outer H-shaped steel pile.

[0010] The construction method of this ultra-deep underground continuous wall includes the following construction steps:

[0011] S1. Set up steel formwork and internal support to form an integrated steel formwork and cast the guide wall;

[0012] S2. Install a combined water-stop component between the guide walls, lower the steel cage of the ground-connected wall segment and attach a HDPE anti-seepage membrane, and cast the ground-connected wall;

[0013] S3, repeat the above steps until the ground-connected wall construction is completed; wherein the ground-connected wall across the underground pipeline area is constructed by splicing;

[0014] S4. After the double-wheel milling machine completes the grooving operation, use a high-pressure brushing device to flush the soil on the I-beam joints at the end of the underground continuous wall.

[0015] Preferably, before implementing step S1, the trench wall is reinforced with three-axis mixing piles, side picks are arranged on the outside of the drum rotary drill bit, and the three-axis mixing pile body intruding into the trench wall is corrected until the verticality of the trench wall meets the design requirements.

[0016] Preferably, in step S2, before the steel cage is put into the groove, the HDPE anti-seepage membrane is rolled up by a reel, and the bottom of the HDPE anti-seepage membrane is fixed to the steel cage with a steel wire. When the steel cage is put into the groove, the rolled HDPE anti-seepage membrane is hoisted between the guide walls by a hoisting rod and a crane hook, and the HDPE anti-seepage membrane is rolled down against the steel cage so that the HDPE anti-seepage membrane adheres to the surface of the steel cage.

[0017] As a preferred option, when the underground pipeline is buried deep from the ground and cannot be moved, first use the splicing construction method for the ground-connected wall across the underground pipeline area based on the detected position of the underground pipeline. First, cast the left underground continuous wall and the right underground continuous wall on the side of the underground pipeline, then hang the upper steel cage of the underground pipeline, and cast the upper underground continuous wall. When excavating to the underground pipeline later, tie the steel bars and pour the concrete to complete the construction of the underground continuous wall wrapping the pipeline.

[0018] Preferably, in step S4, after the double-wheel slot milling machine completes the slotting operation, the machine is lifted to the slot mouth, and then a high-pressure brushing device is installed at the lower control flap portion on the side of the double-wheel slot milling machine and connected to an external high-pressure pump. The high-pressure brushing device includes a connecting support, a connecting screw, a water pipe diverter and a high-pressure nozzle. The high-pressure brushing device descends with the machine, and a high-pressure pump is used to deliver water through the water pipe diverter to be sprayed by the high-pressure nozzle to flush the soil attached to the I-beam joint at the end of the underground continuous wall. The double-wheel slot milling machine is repeatedly lifted and lowered to repeatedly brush the end I-beam joint, and the high-pressure brushing device is removed after the joint is cleaned.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention proposes an efficient treatment technology for trench wall reinforcement and intrusion line. By using a cylindrical rotary drilling bit with side picks, the problem of three-axis mixing piles being difficult to correct due to high strength and one side being hard and the other side being soft is solved, so that the verticality of the trench section meets the design requirements and avoids affecting the subsequent construction quality.

[0021] 2) The present invention proposes a synchronous casting technology of integrated steel formwork for guide wall. The steel formwork and internal support are pre-fabricated in the factory. During the construction process, the guide wall steel formwork can be accurately adjusted and fixed through the screws and adjusting nuts on the steel formwork. The construction is highly convenient and the construction error is small, which can ensure that the guide wall construction accuracy meets the specification requirements.

[0022] 3) The present invention proposes a combined water-stopping technology for underground continuous walls, which uses combined water-stopping components to carry out waterproofing construction on the construction joints of the underground continuous walls. On the basis of ensuring the bearing performance of the ground-connected wall structure, it solves the problem of difficulty in ensuring the waterproofness of the construction joints of the ground-connected walls, thereby improving the overall construction quality of the underground continuous walls.

[0023] 4) The present invention proposes a technology for anti-seepage by attaching a membrane to the outside of a steel cage. While placing a groove under the steel cage, an HDPE anti-seepage membrane is simultaneously attached and fixed to the surface of the steel cage and placed in the groove. Through the combined effect of the anti-seepage membrane and the ground-anchored wall concrete, the ground-anchored wall can meet the construction enclosure requirements while improving the water-stopping effect of the enclosure structure.

[0024] 5) The present invention proposes a construction technology for splicing underground continuous walls across underground pipelines. When the underground pipelines cannot be relocated, the left and right sections and the upper section of the underground pipeline ground-connected wall structures are constructed in sequence. When excavation reaches the location of the sewage pipe, the ground-connected wall that wraps the underground pipeline is constructed. The underground continuous wall construction is successfully completed while ensuring the safety of the underground pipelines.

[0025] 6) The present invention proposes an efficient brushing technology for I-beam joints. By using a high-pressure brushing device to efficiently flush the I-beam joints at the ends of the ground-connected walls, the two processes of cleaning the bottom of the groove and brushing the wall can be carried out simultaneously, which speeds up the construction speed. The brushing effect of the joints is improved by high-pressure water flushing, and it has good economy and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram for efficient treatment of trench wall reinforcement and line intrusion;

[0027] Figure 2 This is a schematic diagram of the integrated steel formwork for the guide wall;

[0028] Figure 3 This is a schematic diagram of the guide wall steel formwork structure;

[0029] Figure 4 This is a schematic diagram of the internal support structure of the guide wall steel formwork;

[0030] Figure 5 This is a schematic diagram of the combined water-stopping component of the underground continuous wall;

[0031] Figure 6 This is a schematic diagram of membrane anti-seepage on the outside of the steel cage;

[0032] Figure 7 This is a schematic diagram of the construction technology of underground continuous wall splicing across underground pipelines;

[0033] Figure 8 This is a schematic diagram of the ground-connected wall structure that wraps the underground pipeline;

[0034] Fig. 9 This is a schematic diagram of the installation of a high-pressure brush washing device;

[0035] Fig.10 Schematic diagram of efficient brushing technology for I-beam joints.

[0036] Description of the accompanying drawings: 1-slot wall, 2-cylinder rotary drilling bit, 3-side pick, 4-guide wall, 5-steel template, 6-horizontal support steel pipe, 7-vertical support steel pipe, 8-template connection hole, 9-adjusting nut, 10-screw, 11-lateral reinforcement rod, 12-vertical reinforcement rod, 13-connecting plate, 14-screw hole, 15-rebar cage, 16-crane hook, 17-hoisting rod, 18-reel, 19-HDPE anti-seepage membrane, 20-ground, 21-upper steel cage, 22-underground pipeline, 23-left underground Continuous wall, 24-right underground continuous wall, 25-upper underground continuous wall, 26-underground continuous wall wrapped with pipelines, 27-inner H-shaped steel piles, 28-outer H-shaped steel piles, 29-open steel troughs, 30-polygonal pipe piles, 31-end plates, 32-long ribs, 33-short ribs, 34-side of double-wheel milling machine, 35-lower control flap, 36-water pipe diverter, 37-connecting screws, 38-connecting supports, 39-high-pressure nozzles, 40-I-beam joints, 41-underground continuous wall, 42-fine stone concrete, 43-main ribs. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0038] Embodiment 1

[0039] As an embodiment, this ultra-deep underground continuous wall construction system includes an integrated steel mold of the guide wall 4, a combined water-stopping component, a reel 18 and a double-wheel slot milling machine;

[0040] like Figure 1 As shown, during the construction of the trench wall 1, in order to solve the problem of invasion by three-axis mixing piles, firstly, side picks 3 are arranged on the outside of the conventional barrel-type rotary drilling bit 2, and then the pile body invading the trench wall 1 is corrected using an optimized drill barrel at the invaded part of the trench wall 1 until the verticality of the trench wall 1 meets the design requirements.

[0041] The casting formwork and internal support of the guide wall 4 are both made of steel structure. Multiple horizontal and vertical reinforcement rods 11 and longitudinal reinforcement rods 12 are arranged on the inside of the steel formwork 5, and a number of formwork connection holes 8 are arranged on the side of the steel formwork 5. The screw 10 is welded and fixed to the steel formwork 5 through the bottom connection plate 13; the internal support is composed of a number of vertical support steel pipes 7 and horizontal support steel pipes 6, and screw holes 14 are reserved on the vertical support steel pipes 7 at both ends. Before pouring the concrete of the guide wall 4, the screw 10 is passed through the screw hole 14 to realize the integrated steel formwork installation, and the adjustment nut 9 is used to realize the adjustment and fixation of the overall structure. Multiple groups of steel formworks 5 can be firmly connected with the help of the formwork connection holes 8. After the formwork and internal support are installed, the concrete of the guide walls 4 on both sides can be poured simultaneously.

[0042] The combined water-stopping member is installed between the guide walls 4, and the combined water-stopping member includes an outer H-shaped steel pile 28 and a polygonal pipe pile 30. The outer H-shaped steel pile 28 is provided with an open steel groove 29 on the side facing the polygonal pipe pile 30, and the polygonal pipe pile 30 is connected to the open steel groove 29 through the main rib plate 43. Specifically, the combined water-stopping member is mainly composed of the outer H-shaped steel pile 28, the open steel groove 29, the inner H-shaped steel pile 27, the polygonal pipe pile 30, the short rib plate 33, the long rib plate 32, the end plate 31 and the main rib plate 43. The inner H-shaped steel pile 27 is arranged in the multilateral pipe pile 30, and the cavity is filled with fine stone concrete 42; the short ribs 33, long ribs 32 and end plates 31 are integrated components, with the center line of the multilateral pipe pile 30 as the symmetry axis, and are symmetrically welded and arranged, and the main ribs 43 are arranged on both sides horizontally upward along the center line of the multilateral pipe pile 30; the open steel trough 29 is arranged on the side of the outer H-shaped steel pile 28, and the end of the main rib 33 is inserted into the open steel trough 29 during installation to realize the connection between the multilateral pipe pile 30 and the outer H-shaped steel pile 28; the combined water-stopping component is hoisted and constructed at the joint of the ground-connected wall, and then the ground-connected walls on both sides are cast in turn. The water-stopping effect and bearing capacity are improved through the combined water-stopping construction technology.

[0043] The reel 18 is used to synchronously attach the HDPE anti-seepage membrane 19 when the steel cage 15 of the ground-connected wall is lowered; a high-pressure brush cleaning device is installed at the bottom of the double-wheel groove milling machine.

[0044] Embodiment 2

[0045] As another embodiment, this embodiment 2 is proposed on the basis of the embodiment 1, and the construction method of the ultra-deep underground continuous wall includes the following steps:

[0046] S1, such as Figure 1As shown, after the trench wall 1 is reinforced with the three-axis mixing pile, the barrel-type rotary drilling bit 2 with the side pick 3 is first installed at the construction site, and the three-axis mixing pile body intruding into the trench wall 1 is corrected so that the verticality of the trench wall 1 meets the design requirements. The barrel-type rotary drilling bit 2 and the side pick 3 are used to solve the problem that the three-axis mixing pile is difficult to correct due to its high strength and one side being hard and the other side being soft.

[0047] S2, such as Figures 2 to 4 As shown, before pouring the guide wall 4, the formwork and internal support are first assembled and debugged at the designated site. After confirmation of compliance, the screw 10 on the steel formwork 5 is passed through the screw hole 14 on the vertical support steel pipe 7 and preliminarily fixed and adjusted through the adjusting nut 9. After the steel bars of the guide wall 4 are tied, the integrated steel formwork is lowered into the groove section between the guide walls 4. After measurement and calculation, the adjusting nut 9 is used to more accurately fix and adjust the steel formwork 5. After the formwork is installed, the concrete of the guide walls 4 on both sides is poured synchronously. At the same time, when multiple steel formworks 5 need to be overlapped and installed, bolts can be used to pass through the formwork connection holes 8 for a firm connection.

[0048] S3. After the guide wall 4 is built, the factory-produced combined water-stopping components are transported to the site, and the outer H-shaped steel piles 28 are statically driven at the designated construction location. Then, the ground-connected wall groove section is constructed on one side of the joint. After the groove is qualified, the multilateral pipe piles 30 are hoisted, and the ends of the main ribs 43 of the multilateral pipe piles 30 are aligned with the inner groove of the open steel groove 29 and sunk to the designed position to complete the connection and fixation of the multilateral pipe piles 30 and the outer H-shaped steel piles 28. Then, the steel cage is hoisted and the underground continuous wall concrete is poured. After the construction of the ground-connected wall on one side is completed, the inner H-shaped steel piles 27 are arranged in the multilateral pipe piles 30, and the hollow parts of the multilateral pipe piles 30 are filled with fine stone concrete 42. Then, the underground continuous wall on the other side of the joint is grooved, the steel cage is lowered, and the concrete is poured. The above steps are repeated until all the ground-connected walls using the combined water-stopping method are completed.

[0049] S4, such as Fig. 9 and Fig.10 As shown, after the double-wheel slot milling machine completes the slotting operation, the machine is lifted to the slot mouth, and then a high-pressure brushing device is installed at the lower control flap 35 of the side 34 of the double-wheel slot milling machine and connected to an external high-pressure pump. In the process of the high-pressure brushing device descending with the machine, a high-pressure pump is used to convey water through a water pipe diverter 36 and three high-pressure nozzles 39 are used to spray and wash the soil on the joint of the I-beam 40 at the end of the underground continuous wall 41 attached to the table. The joint of the I-beam 40 at the end can be repeatedly brushed by manipulating the lifting and lowering of the double-wheel slot milling machine. After the joint is cleaned, the high-pressure brushing device is removed.

[0050] Embodiment 3

[0051] As another embodiment, this embodiment 3 proposes a more specific construction method of an ultra-deep underground continuous wall based on the embodiment 2, in step S3:

[0052] Before the steel cage 15 is hoisted into the groove, the HDPE anti-seepage membrane 19 is rolled up by the reel 18, and the bottom is fixed to the steel cage 15 with a steel wire. While the steel cage 15 is placed under the groove, the rolled HDPE anti-seepage membrane 19 is rolled counterclockwise along the vertical direction of the steel cage 15 using the crane hook 16 and the lifting rod 17, so that the HDPE anti-seepage membrane 19 can be evenly attached to the surface of the steel cage 15, thereby improving the water-stopping effect.

[0053] When the underground pipeline 22 is buried far from the ground 20 and cannot be moved, the ground-connected wall across the pipeline area is constructed by splicing. Specifically: first, according to the detected position of the underground pipeline 22, the ground-connected wall within the excavation influence range is divided into sections, and then the left and right ground-connected wall steel cages are hoisted and concrete is poured to complete the construction of the left underground continuous wall 23 and the right underground continuous wall 24. Then, the trench is excavated on the upper part of the underground pipeline 22. After the trench is qualified, the upper steel cage 21 is hoisted and the upper underground continuous wall 25 is poured. When the subsequent foundation pit is gradually excavated and supported to the underground pipeline 22, the soil around the underground pipeline 22 is cleared, the steel cage is tied and concrete is poured to complete the construction of the underground continuous wall 26 wrapping the pipeline.

[0054] It should be noted that the parts in this embodiment that are the same or similar to those in the second embodiment can be referenced to each other and will not be described in detail in this application.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. An ultra-deep underground continuous wall construction system, characterized by: It includes an integrated steel formwork for the guide wall, a combined water-stopping member, a reel and a double-wheel slot milling machine; The combined water-stopping component is installed between the guide walls. The combined water-stopping component includes an outer H-shaped steel pile and a polygonal pipe pile. An open steel groove is provided on the side of the outer H-shaped steel pile facing the polygonal pipe pile. The polygonal pipe pile is connected with the open steel groove through the main rib plate. The reel is used to synchronously attach the HDPE anti-seepage membrane when the steel cage of the ground-connected wall is lowered; a high-pressure brushing device is installed at the bottom of the double-wheel milling machine.

2. The ultra-deep underground continuous wall construction system according to claim 1, characterized in that: The integrated steel formwork includes a steel formwork and an inner support. The inner support is arranged between the steel formworks. A number of formwork connection holes are arranged on the sides of the steel formwork along the length direction of the guide wall. The steel formwork is fixed with a screw by welding through a bottom connecting plate. An adjusting nut is provided on the screw. The inner support includes a vertical support steel pipe and a horizontal support steel pipe. The vertical support steel pipe is arranged on both sides of the inner support and has screw holes reserved therefor. The screw passes through the screw holes to connect the steel formwork and the inner support to form an integrated steel formwork.

3. The ultra-deep underground continuous wall construction system according to claim 1, characterized in that: The combined water-stop component includes an outer H-shaped steel pile, an open steel trough, an inner H-shaped steel pile, a polygonal pipe pile, a side rib plate and a main rib plate. The inner H-shaped steel pile is arranged in the polygonal pipe pile, and the inside of the polygonal pipe pile is filled with fine stone concrete; the side rib plates are symmetrically welded and arranged on the outside of the polygonal pipe pile with the center line of the polygonal pipe pile as the symmetry axis, and the main rib plates are arranged on both sides horizontally upward along the center line of the polygonal pipe pile; the open steel trough is arranged with the outer H-shaped steel pile facing the side of the polygonal pipe pile, and the end of the main rib plate is inserted in the open steel trough to realize the connection between the polygonal pipe pile and the outer H-shaped steel pile.

4. A construction method for an ultra-deep underground continuous wall as claimed in claim 1, characterized in that: The construction steps include: S1. Set up steel formwork and internal support to form an integrated steel formwork and cast the guide wall; S2. Install a combined water-stop component between the guide walls, lower the steel cage of the ground-connected wall segment and attach a HDPE anti-seepage membrane, and cast the ground-connected wall; S3, repeat the above steps until the ground-connected wall construction is completed; wherein the ground-connected wall across the underground pipeline area is constructed by splicing; S4. After the double-wheel milling machine completes the grooving operation, use a high-pressure brushing device to flush the soil on the I-beam joints at the end of the underground continuous wall.

5. The construction method of the ultra-deep underground continuous wall according to claim 4, characterized in that: Before implementing step S1, the trench wall is reinforced with three-axis mixing piles, side picks are arranged on the outside of the drum rotary drill bit, and the three-axis mixing pile body intruding into the trench wall is corrected until the verticality of the trench wall meets the design requirements.

6. The construction method of the ultra-deep underground continuous wall according to claim 4, characterized in that: In step S2, before the steel cage is put into the groove, the HDPE anti-seepage membrane is rolled up by a reel, and the bottom of the HDPE anti-seepage membrane is fixed to the steel cage with a steel wire. When the steel cage is put into the groove, the rolled HDPE anti-seepage membrane is hoisted between the guide walls by a hoisting rod and a crane hook, and the HDPE anti-seepage membrane is rolled down against the steel cage so that the HDPE anti-seepage membrane adheres to the surface of the steel cage.

7. The construction method of the ultra-deep underground continuous wall according to claim 4, characterized in that: When the underground pipeline is buried deep from the ground and cannot be moved, first of all, based on the detected position of the underground pipeline, the ground-connected wall across the underground pipeline area is constructed by splicing. First, the left underground continuous wall and the right underground continuous wall on the side of the underground pipeline are cast, and then the upper steel cage of the underground pipeline is hoisted and the upper underground continuous wall is cast. When the excavation reaches the underground pipeline, the steel bars are tied and the concrete is poured to complete the construction of the underground continuous wall that wraps the pipeline.

8. The construction method of the ultra-deep underground continuous wall according to claim 4, characterized in that: In step S4, after the double-wheel slot milling machine completes the slotting operation, the machine is lifted to the slot mouth, and then a high-pressure brushing device is installed at the lower control flap on the side of the double-wheel slot milling machine and connected to an external high-pressure pump. The high-pressure brushing device includes a connecting support, a connecting screw, a water pipe diverter and a high-pressure nozzle. The high-pressure brushing device descends with the machine, and a high-pressure pump is used to deliver water through the water pipe diverter to spray and flush the soil attached to the I-beam joint at the end of the underground continuous wall by the high-pressure nozzle. The double-wheel slot milling machine is repeatedly lifted and lowered to repeatedly brush the end I-beam joint. After the joint is cleaned, the high-pressure brushing device is removed.

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