Water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall and its construction method

Abstract

The present invention relates to a water-rich thick sand layer combined anti-circumference ultra-deep underground continuous wall and a construction method thereof, including a grouting iron sheet pre-supporting technical system, a joint box side wall long sand bag sand flushing gap backfilling compaction technical system, a back steel and weight combined bottom anti-circumference technical system, a lock pipe and sand bag matching filling anti-circumference technical system and a ground-connected wall steel joint brushing technical system. The construction efficiency of the water-rich thick sand layer combined anti-circumference ultra-deep underground continuous wall can be improved, and the engineering quality and safety can be guaranteed.

Description

Technical Field

[0001] The invention relates to a water-rich thick sand layer combined bypass-proof ultra-deep underground continuous wall and a construction method thereof, belonging to the technical field of underground foundation pits, and is suitable for the construction of a water-rich thick sand layer combined bypass-proof ultra-deep underground continuous wall. Background Art

[0002] The underground continuous wall integrates the functions of water interception, soil retaining and anti-seepage, and has excellent performance as a permanent load-bearing structure. This feature has greatly broadened the imaginary boundaries of the development and utilization of underground space resources. It uses professional trenching equipment to dig a deep trench with a mud wall at a predetermined location, then installs a steel cage in the trench and pours underwater concrete, and finally solidifies into a reinforced concrete wall with high rigidity, strong integrity, high durability and excellent anti-seepage ability. With the continuous advancement of urban construction, the underground continuous wall has been widely adopted in the support structure of deep foundation pits in underground projects due to its significant advantages.

[0003] In terms of the connection between the two sections of the underground continuous wall, the I-beam joints with easy-to-control water-stopping quality are often used. However, when constructing the underground continuous wall joints, the I-beams are often mixed with concrete, mud, sand and other debris due to the bypass during the pouring of the underground continuous wall, increasing the risk of joint leakage. Especially in the case of high head and sand layer geology, the excavation of the foundation pit leads to an increase in the pressure difference between the internal and external water levels. In addition, the water gushing channel formed by the joints of the underground continuous wall makes it easy for water and sand to gushing during the excavation of the foundation pit. On the one hand, the bypass phenomenon will cause the concrete block to bulge out. If it is not handled in time, it will affect the lowering of the steel cage of the underground continuous wall, so that the sealing steel bars of the steel cage cannot be close to the H-shaped steel web of the poured underground continuous wall, thereby affecting the lap width of the joint. In addition, there will be dead corners under the protruding concrete blocks that the wall brush cannot reach, resulting in mud skin deposition, so that there will be mud cracks that penetrate the wall in the middle after the two walls are poured, and then leaking holes will be formed during the excavation of the foundation pit, which will bury safety hazards for the excavation of the foundation pit. On the other hand, the bypass phenomenon will cause mud to be trapped in the joints of the underground continuous wall, forming a concentrated leakage channel, which will affect the anti-seepage and support effect of the underground continuous wall. The mud inclusion phenomenon may be caused by a variety of factors, such as poor verticality of the trench, poor performance of the wall protection mud, mud sedimentation, etc. Dealing with the bypass phenomenon requires additional time and resources, increasing construction costs and construction period. Improper handling will also lead to wall quality problems, affecting the quality and progress of the overall project.

[0004] For the construction of ultra-deep underground continuous walls with water-rich thick sand layers to prevent bypass flow, it is urgent to propose a construction method that can improve construction efficiency while ensuring project quality and safety. Summary of the invention

[0005] The purpose of the present invention is to provide a method for constructing a water-rich thick sand layer combined anti-circulation ultra-deep underground continuous wall, which is used to improve the construction efficiency of the water-rich thick sand layer combined anti-circulation ultra-deep underground continuous wall and ensure the quality and safety of the project.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A water-rich thick sand layer combined anti-circumference ultra-deep underground continuous wall, including a grouting iron sheet pre-supporting technology system, a joint box side wall long sand bag sand flushing gap backfilling compaction technology system, a back steel and weight combined bottom anti-circumference technology system, a lock pipe and sand bag combined filling anti-circumference technology system and a ground-connected wall steel joint wall brushing technology system;

[0008] The grout-stopping iron sheet pre-supporting technology system includes the ground-connected wall reinforcement cage and the joint grout-stopping part. The ground-connected wall reinforcement cage includes longitudinal main reinforcement, stirrups and horizontal main reinforcement.

[0009] The technical system of backfilling and compacting the gaps in the side wall of the joint box with long sandbags includes an I-beam and a joint box between the excavated grouting area and the unexcavated area, and the I-beam is welded with a galvanized iron strip;

[0010] The bottom anti-circulation technology system of the back steel and weight combination includes a concrete pouring system and a bottom combined anti-circulation system. The concrete pouring system is composed of a conduit funnel, a fixed platform and an underwater concrete pouring conduit. The bottom combined anti-circulation system includes a bag-filled mud grouting weight wall, a steel cage joint steel, a connecting anchor bolt, a back anti-circulation steel and a jack-up puller on the horizontal ground line.

[0011] The anti-circumvention technology system is a combination of lock pipes and sandbags. During construction, slurry stop plates, lock pipes and sandbags are set between the leading and trailing widths to form a combined anti-circumvention system.

[0012] The wall brushing technology system of the ground-connected wall steel joint is composed of steel plate welding, including a transport hanging plate, a mud box chamber and a mud box body. A backing plate and a connecting plate with holes are welded on the rear side of the mud box body, and a front end mud shoveling and wall brushing part is welded on the front side. The mud box body has two mud box chambers, one of which is provided with a transport hanging plate for lifting and transporting the box body.

[0013] Furthermore, the bottom anti-circumvention technical system of the installed back steel and ballast weight combination is arranged in an axisymmetric manner.

[0014] Furthermore, the joint grouting part is composed of an I-beam, a grouting iron sheet and a triangular supporting reinforcement welded to the horizontal main reinforcement to ensure that a closed space is formed in the groove when the ground-connected wall is cast to prevent the concrete slurry from flowing around.

[0015] Furthermore, backfill sand bags are arranged between the joint box and the excavation surface and the galvanized iron strips.

[0016] Furthermore, the locking tube is fixed by a jack impact device on the horizontal main reinforcement during installation, and a sand flushing and suction pipe is provided inside to flush and suck out the mud in the tube.

[0017] Furthermore, the front end mud shoveling and wall brushing part is composed of a steel mud shoveling block and a bull horn scraper head.

[0018] A method for constructing an ultra-deep underground continuous wall with a water-rich thick sand layer combined with an anti-bypass flow as described above comprises the following construction steps:

[0019] S1. Installation of grout-stop iron sheet pre-supporting technology system:

[0020] The longitudinal main reinforcement, horizontal main reinforcement and stirrups are welded in advance to form a ground-connected wall reinforcement cage and placed in the ground-connected wall. Then, a grout-stopping iron sheet is welded on the outside of the I-beam side plate at the joint. Finally, triangular support bars are added to the horizontal main reinforcement to form a closed space in the groove to prevent the concrete slurry from flowing around.

[0021] S2. Installation of the joint box side wall long sandbag flushing gap backfill compaction technology system:

[0022] An I-beam is set between the excavated grouting area and the unexcavated area. A galvanized iron strip is welded on the wing plate of the I-beam, which is pressed and pressed against the trench wall during the first concrete pouring.

[0023] Install the joint box on the outside of the I-beam, and use backfill sand bags to fill the gap between the joint box and the excavation surface.

[0024] S3. Install the back steel and weight combination bottom anti-circumvention technology system:

[0025] A fixed platform jack puller is pre-installed on the horizontal ground line, and the conduit funnel and the underwater concrete pouring conduit are fixed by installing a fixed platform;

[0026] Then, the back anti-circulation steel is fixed on the jack puller, connected to the steel cage joint steel by connecting anchor bolts, and the bag is used to flush the mud and press the weight wall at the back to prevent the bottom from circumferential flow. When the concrete is initially set, the back anti-circulation steel is pulled out;

[0027] S4. Install the lock pipe and sandbag to fill the anti-circumvention technology system:

[0028] First, a slurry stop plate is set between the leading and trailing widths to prevent bypass flow, and then a jack impact device is installed on the horizontal main reinforcement and the locking tube is fixed with a sand bag;

[0029] A sand flushing and suction pipe is installed inside the lock pipe to flush and suck the mud inside the pipe.

[0030] S5. Installation of ground-connected wall steel joint brushing technology system:

[0031] Weld the back plate and the holed connecting plate on the rear side of the mud box to connect with the groove forming machine; weld the front end mud shoveling and wall brushing part on the front side.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1) The grout-stopping iron sheet pre-supporting technical system is convenient to construct, simple to operate, has a reasonable force form, and has good technical and economic benefits;

[0034] 2) The bottom anti-circulation technology system of the back steel and weight combination can effectively reduce mud inclusions and joint disturbances, and avoid the "concrete locking phenomenon" in which the strength of the large underground continuous wall is formed after a long pouring time and initial setting, which makes it difficult to pull out the steel using a jack;

[0035] 3) The anti-bypass technology system of the lock-mouth pipe and sandbag filling can be used in any soil layer, which can effectively control the water-stopping quality of the I-beam, save the preparation time before pouring concrete, and improve the construction efficiency;

[0036] 4) The wall brushing technology system for the ground-anchored wall steel joints can be directly connected to the trenching machine. By using the trenching machine for wall brushing, the use of the trenching machine can be increased, the on-site cost of other lifting machinery can be reduced, and the construction cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the system structure of the grout-stopping iron sheet pre-supporting technology of the present invention;

[0038] Figure 2 A schematic diagram of the system structure of the long sandbag flushing and backfilling compaction technology for the side wall of the joint box of the present invention;

[0039] Figure 3 A schematic diagram of the bottom anti-circumvention technical system structure of the back steel and weight combination of the present invention;

[0040] Figure 4 Schematic diagram of the anti-circumvention technical system structure of the lock-mouth pipe and sandbag combined filling of the present invention;

[0041] Figure 5 A schematic diagram of the system structure of the ground-connected wall steel joint brushing technology of the present invention;

[0042] Figure 6 A schematic plan view of the wall brushing technology system for the ground-connected wall steel joints of the present invention.

[0043] Explanation of the reference numerals: 1. Ground-connected wall reinforcement cage; 2. Longitudinal main reinforcement; 3. I-beam; 4. Stop grouting iron sheet; 5. Concrete slurry; 6. Triangular support reinforcement; 7. Stirrup reinforcement; 8. Horizontal main reinforcement; 9. Backfill sandbags; 10. Joint box; 11. Galvanized iron strip; 12. Excavation surface; 13. Unexcavated area; 14. Excavation and grouting area; 15. Jack puller; 16. Back bypass steel; 17. Conduit funnel; 18. Fixed platform; 19. Horizontal ground line; 20. Connection Anchor bolts; 21. Steel cage joint steel; 22. Underwater concrete pouring guide tube; 23. Bag-filled mud grouting weight wall; 24. Leading width; 25. Locking tube; 26. Jack impact device; 27. Rear width; 28. Slurry stop plate; 29. ​​Sand flushing and suction pipe; 30. Filling sand bags; 31. Perforated connecting plate; 32. Transport hanging plate; 33. Mud box chamber; 34. Mud box body; 35. Back plate; 36. Steel mud shovel block; 37. Horn scraper; 38. Front mud shovel and wall brushing part. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0045] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0046] Embodiment 1

[0047] The construction method of the water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall comprises the following steps:

[0048] S1. Installation of grout-stop iron sheet pre-supporting technology system:

[0049] The longitudinal main reinforcement 2, horizontal main reinforcement 8 and stirrups 7 are welded in advance to form a ground-connected wall reinforcement cage 1 and placed in the ground-connected wall. Subsequently, a grout-stopping iron sheet 4 is welded to the outside of the side plate of the I-beam 3 at the joint. Finally, a triangular support reinforcement 6 is installed on the horizontal main reinforcement 8 to form a closed space in the groove to prevent the concrete slurry 5 from flowing around.

[0050] S2. Installation of the joint box side wall long sandbag flushing gap backfill compaction technology system:

[0051] An I-beam 3 is provided between the excavated grouting area 14 and the unexcavated area 13. A galvanized iron strip 11 is welded on the wing plate of the I-beam 3, which is pressed and pressed against the trench wall during the first concrete pouring. A joint box 10 is installed on the outside of the I-beam 3, and the gap between the excavated surface 12 and the backfill sandbag 9 is backfilled and compacted.

[0052] S3. Install the back steel and weight combination bottom anti-circumvention technology system:

[0053] The method includes installing a fixed platform 18 and a jack puller 15 on a horizontal ground line 19 in advance, and fixing the conduit funnel 17 and the underwater concrete pouring conduit 22 through the fixed platform 18. Then, the back anti-circulation steel 16 is fixed to the jack puller 15, and the steel cage joint steel 21 is connected by connecting anchor bolts 20, and the mud pressure wall 23 is poured with a bag at the back to prevent the bottom from circumferential flow, and the back anti-circulation steel 16 is pulled out when the concrete is initially set.

[0054] S4. Install the lock pipe and sandbag to fill the anti-circumvention technology system:

[0055] First, a slurry stop plate 28 is set between the leading width 24 and the trailing width 27 to prevent bypass flow, and then a jack impact device 26 is installed on the horizontal main reinforcement 8 and a sand bag 30 is filled to fix the lock tube 25. Finally, a sand flushing and suction pipe 29 is constructed inside the lock tube 25 to flush and suck the mud in the pipe.

[0056] S5. Installation of ground-connected wall steel joint brushing technology system:

[0057] This wall brushing system is welded by steel plates, including a transport hanging plate 32, a mud box chamber 33 and a mud box body 34. A backing plate 35 and a holed connecting plate 31 are welded to the rear side of the mud box body 34, which can be directly connected to the troughing machine; a front mud shoveling and wall brushing part 38 is welded to the front side, and the front mud shoveling and wall brushing part 38 includes a steel mud shoveling block 36 and a bull horn scraper 37. The mud shoveling plate and the scraper have high hardness and have a better cleaning effect on mud with strong adhesion.

[0058] Embodiment 2

[0059] The invention relates to a water-rich thick sand layer combined bypass prevention ultra-deep underground continuous wall, comprising a slurry-stop iron sheet pre-supporting technology system, a joint box side wall long sandbag sand flushing gap backfilling compaction technology system, a back steel and weight combined bottom bypass prevention technology system, a lock pipe and sandbag combined filling bypass prevention technology system and a ground-connected wall steel joint wall brushing technology system.

[0060] like Figure 1As shown, the grout-stopping iron sheet pre-stretching technology system includes a ground-connected wall reinforcement cage 1 and a joint grout-stopping part. The ground-connected wall reinforcement cage 1 includes longitudinal main reinforcement 2, stirrups 7 and horizontal main reinforcement 8; the joint grout-stopping part is composed of an I-beam 3, a grout-stopping iron sheet 4 and a triangular support reinforcement 6 welded to the horizontal main reinforcement 8, which ensures that a closed space is formed in the groove when the ground-connected wall is cast to prevent the concrete slurry 5 from flowing around.

[0061] like Figure 2 As shown, the technical system for backfilling and compacting the gaps in the side walls of the joint box by flushing with long sandbags includes an I-beam 3 and a joint box 10 between the excavation and grouting area 14 and the unexcavated area 13. During construction, backfill sandbags 9 are set between the joint box 10 and the excavation surface 12 and the galvanized iron strip 11.

[0062] like Figure 3 As shown, the back steel and ballast combined bottom anti-circulation technology system includes a concrete pouring system and a bottom combined anti-circulation system. The concrete pouring system consists of a conduit funnel 17, a fixed platform 18 and an underwater concrete pouring conduit 22; the bottom combined anti-circulation system includes a bag-filled mud ballast wall 23, a steel cage joint steel 21, a connecting anchor 20, a back anti-circulation steel 16 and a jack puller 15 on the horizontal ground line 19.

[0063] like Figure 4 As shown, the locking tube and the sandbag are combined to form an anti-circumference flow technical system. During construction, a slurry stop plate 28, a locking tube 25 and a filling sandbag 30 are arranged between the leading width 24 and the trailing width 27 to form a combined anti-circumference flow system. The locking tube 25 is fixed by a jack impact device 26 on the horizontal main reinforcement 8 during installation, and a sand flushing and suction pipe 29 is arranged inside to flush and suck the mud in the tube.

[0064] like Figure 5 , Figure 6 As shown, the ground-connected wall steel joint wall brushing technology system has a backing plate 35 and a perforated connecting plate 31 welded on the rear side of the mud passing box 34, and a front end mud shoveling and wall brushing part 38 welded on the front side. The mud passing box 34 has two mud passing box chambers 33, one of which is provided with a transport hanging plate 32, which can lift the box for transportation; the front end mud shoveling and wall brushing part 38 is composed of a steel mud shoveling block 36 and a bull horn scraper 37.

[0065] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0066] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0067] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0068] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall, characterized in that: It includes the pre-opening technology system of the grout-stopping iron sheet, the backfilling and compacting technology system of the gaps in the side wall of the joint box with long sandbags, the bottom anti-circumference technology system of the back steel and weight combination, the anti-circumference technology system of the lock pipe and sandbag combined filling, and the wall brushing technology system of the ground-connected wall steel joint; The grout-stopping iron sheet pre-stretching technical system comprises a ground-connected wall reinforcement cage (1) and a joint grout-stopping part, wherein the ground-connected wall reinforcement cage (1) comprises longitudinal main reinforcement (2), stirrups (7) and horizontal main reinforcement (8); The joint box side wall long sandbag sand flushing gap backfill compaction technology system comprises an I-beam (3) and a joint box (10) provided between an excavated grouting area (14) and an unexcavated area (13), wherein a galvanized iron strip (11) is welded to the I-beam (3); The back steel and ballast combined bottom bypass prevention technology system comprises a concrete pouring system and a bottom combined bypass prevention system, wherein the concrete pouring system is composed of a conduit funnel (17), a fixed platform (18) and an underwater concrete pouring conduit (22); the bottom combined bypass prevention system comprises a bag-filled slurry ballast wall (23), a steel cage joint steel (21), a connecting anchor bolt (20), a back bypass prevention steel (16) and a jack puller (15) on a horizontal ground line (19); The locking tube and the sandbag are combined to form an anti-circumvention flow technology system. During construction, a slurry stop plate (28), a locking tube (25) and a sandbag (30) are arranged between the leading width (24) and the trailing width (27) to form a combined anti-circumvention flow system. The ground-connected wall steel joint wall brushing technology system is formed by welding steel plates, and comprises a transport hanging plate (32), a mud passing box chamber (33) and a mud passing box body (34). A backing plate (35) and a connection plate with holes (31) are welded to the rear side of the mud passing box body (34), and a front mud scraping and wall brushing part (38) is welded to the front side. The mud passing box body (34) has two mud passing box chambers (33), one of which is provided with a transport hanging plate (32) for hoisting and transporting the box body.

2. The water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall according to claim 1, characterized in that: The joint grouting stop portion is composed of an I-beam (3), a grouting stop iron sheet (4), and a triangular support rib (6) welded to a horizontal main rib (8), so as to ensure that a closed space is formed in the groove when the ground-connected wall is cast, thereby preventing the concrete grout (5) from flowing around.

3. The water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall according to claim 1, characterized in that: Backfill sand bags (9) are arranged between the joint box (10), the excavation surface (12), and the galvanized iron strip (11).

4. The water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall according to claim 1, characterized in that: The locking tube (25) is fixed by a jack impact device (26) on the horizontal main reinforcement (8) during installation, and is provided with a sand flushing and suction pipeline (29) inside for flushing and sucking mud in the tube.

5. A water-rich thick sand layer combined bypass-proof ultra-deep underground continuous wall according to any one of claims 1 to 4, characterized in that: The front end mud scraping and wall brushing part (38) is composed of a steel mud scraping block (36) and a bull horn scraping head (37).

6. A method for constructing a water-rich thick sand layer combined anti-bypass ultra-deep underground continuous wall as claimed in claim 5, characterized in that: The construction steps include: S1. Installation of grout-stop iron sheet pre-supporting technology system: The longitudinal main reinforcement (2), the horizontal main reinforcement (8) and the stirrups (7) are welded in advance to form a ground-connected wall reinforcement cage (1) and placed in the ground-connected wall. Subsequently, a grout-stopping iron sheet (4) is welded on the outer side of the side plate of the I-beam (3) at the joint. Finally, a triangular support reinforcement (6) is installed on the horizontal main reinforcement (8) to form a closed space in the groove to prevent the concrete slurry (5) from flowing around. S2. Installation of the joint box side wall long sandbag flushing gap backfill compaction technology system: An I-beam (3) is arranged between the excavated grouting area (14) and the unexcavated area (13), and a galvanized iron strip (11) is welded on the wing plate of the I-beam (3) so as to be pressed and closely attached to the trench wall when the first width concrete is poured; The joint box (10) is installed on the outside of the I-beam (3), and the gap between the joint box and the excavation surface (12) is backfilled and compacted using backfill sand bags (9); S3. Install the back steel and weight combination bottom anti-circumvention technology system: A fixed platform (18) and a jack puller (15) are pre-installed on a horizontal ground line (19), and the conduit funnel (17) and the underwater concrete pouring conduit (22) are fixed by installing the fixed platform (18); Then, the back anti-circulation steel (16) is fixed to the jack puller (15), connected to the steel cage joint steel (21) by connecting anchor bolts (20), and a bag is used to flush mud and press the weight wall (23) at the back to prevent bottom circumference, and the back anti-circulation steel (16) is pulled out when the concrete is initially set; S4. Install the lock pipe and sandbag to fill the anti-circumvention technology system: First, a slurry stop plate (28) is arranged between the leading width (24) and the trailing width (27) to prevent bypass flow, and then a jack impact device (26) is installed on the horizontal main reinforcement (8) and a sand bag (30) is used to fix the locking tube (25); A sand flushing and suction pipe (29) is provided inside the locking pipe (25) to flush and suck out the mud in the pipe; S5. Installation of ground-connected wall steel joint brushing technology system: A backing plate (35) and a connecting plate with holes (31) are welded to the rear side of the mud passing box (34) to connect with the groove forming machine; and a front end mud shoveling and wall brushing part (38) is welded to the front side.

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