Construction method for removing concrete around a cross-steel-plate joint ground wall

Abstract

The application discloses a construction method for removing concrete around a cross-shaped steel plate joint of a diaphragm wall, which comprises the following steps: drilling a hole; grabbing a groove; installing a soil retaining member; tightly attaching a sharp tooth to the cross-shaped steel plate joint; moving up and down a grab bucket of a grooving machine to break the whole concrete structure around the cross-shaped steel plate joint; hanging a wall shoveling device on the grab bucket of the grooving machine, moving up and down the grab bucket of the grooving machine to shovel off the remaining concrete around the cross-shaped steel plate joint; replacing the wall shoveling device with a wall brushing device, tightly attaching the wall brushing device to the cross-shaped steel plate joint by the grab bucket of the grooving machine, and moving up and down the grab bucket of the grooving machine to completely remove the residual concrete around the cross-shaped steel plate joint. The construction method for removing the concrete around the cross-shaped steel plate joint of the diaphragm wall is suitable for removing the concrete around the cross-shaped steel plate joint of the diaphragm wall in a narrow space, the steps are reasonably designed, the steps are closely combined, the concrete around the cross-shaped steel plate joint of the diaphragm wall is completely removed, the construction difficulty is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of diaphragm wall technology, and in particular to a construction method for removing concrete flowing around a diaphragm wall with a cross-shaped steel plate joint. Background Technology

[0002] Diaphragm walls, as the most reliable and safest type of underground engineering retaining structure, are widely used in various underground projects. However, the biggest safety hazard of diaphragm walls is the potential for leakage or voids at the joints between adjacent diaphragm walls, posing significant safety risks such as water and sand inrush during the excavation phase. The main causes are inadequate backfilling and compaction at the joints of the initial diaphragm wall sections, and trench wall collapse during trenching. These issues cause concrete to flow around the joints during pouring, accumulating there. By the time the connecting sections of the diaphragm wall are trenched, the flowed concrete has hardened and bonded to the joint, making it difficult for the trenching equipment to remove. When using a heavy hammer, because one side of the flowed concrete is a steel joint and the other side is a weak stratum, the hammer tends to deflect to the stratum side after repeated blows, failing to break the flowed concrete. The presence of the flowed concrete also compresses the space between adjacent trenches, preventing the reinforcing cages of the adjacent diaphragm walls from interlocking with the initial joint, weakening the overall integrity of the diaphragm wall and making the joints vulnerable points prone to cracking and leakage. Especially for diaphragm walls with cross joints, such as Figure 1 As shown, a cross-shaped steel plate joint 2 is installed at the joint of the diaphragm wall 1. The space between the cross-shaped steel plate joint 2 and the ground layer 5 is filled with crushed stone 4. During the pouring process of the diaphragm wall 1 concrete, it flows around into the crushed stone 4 through the gaps on both sides of the cross-shaped steel plate joint 2, generating around-flow concrete 3. Because there is a single protruding steel plate 21 in the middle of the cross-shaped steel plate joint 2, the around-flow concrete 3 is more tightly bonded to the cross-shaped steel plate joint 2. Moreover, the protruding steel plate 21 further compresses the space at the cross-shaped steel plate joint 2 and creates more narrow spaces, making it impossible for conventional equipment to operate in such irregular spaces, thus increasing the difficulty of removing the around-flow concrete 3. Therefore, in view of the above problems and the current construction situation, it is urgent to design a new device and method to properly solve the problem. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a construction method for removing around-flowing concrete in narrow spaces of cross-shaped steel plate joints and diaphragm walls. The method has a reasonable step design, with each step closely integrated, and can completely remove the around-flowing concrete from the cross-shaped steel plate joints and diaphragm walls, thereby reducing construction difficulty and improving construction efficiency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A construction method for removing concrete flowing around a diaphragm wall with a cross-shaped steel plate joint includes the following steps:

[0006] S1. Drill holes in the surrounding concrete along the length of the surrounding concrete, so that the overlap width of each hole protruding from both sides of the cross steel plate joint is not less than 1 / 4 of the hole diameter.

[0007] S2. After drilling is completed, the grab bucket of the trenching machine is used to trench the soil outside the flow concrete until an operating trench is formed on the outside of the flow concrete that is lower than the flow concrete.

[0008] S3. Install retaining structures on the side of the operating channel away from the surrounding concrete and backfill the bottom of the operating channel with counter-pressure soil to stabilize the retaining structures.

[0009] S4. Install sharp teeth on the side of the grab bucket of the trenching machine facing the surrounding concrete. The first reserved groove is set in the middle of the sharp teeth for the protruding steel plate of the cross steel plate joint to pass through. The sharp teeth are pressed tightly against the cross steel plate joint, and the entire surrounding concrete structure is broken up by moving the grab bucket of the trenching machine up and down.

[0010] S5. Replace the sharp teeth on the grab bucket of the trenching machine and lift out the retaining parts;

[0011] S6. Hang the wall scraper on the grab bucket of the trenching machine, use the grab bucket of the trenching machine to press the wall scraper tightly against the cross steel plate joint, and use the grab bucket of the trenching machine to move up and down to remove all the remaining flowing concrete on the cross steel plate joint.

[0012] S7. Remove the wall scraper from the grab bucket of the trenching machine and replace it with a wall brusher;

[0013] S8. Use the grab bucket of the trenching machine to press the wall brush tightly against the cross steel plate joint, and use the grab bucket of the trenching machine to move up and down to completely remove the remaining flow concrete residue on the cross steel plate joint.

[0014] As a further improvement to the above technical solution:

[0015] In S1, a hole is drilled near the cross steel plate joint, and the hole is drilled once to the bottom of the surrounding concrete, and then adjacent holes are drilled in sequence.

[0016] Drilling is performed using a cylindrical drill, which has multiple pairs of drill bits at its bottom, with each pair of drill bits spaced equidistantly around the center of the cylindrical drill.

[0017] The drill bits are oriented in opposite directions.

[0018] The sharp teeth are provided in multiple groups, and each group of sharp teeth is arranged at intervals along a straight line. The sharp teeth in each group are arranged at intervals from bottom to top, and the outward convex length of the upper sharp teeth is longer than that of the lower sharp teeth.

[0019] The wall-shoveling device includes a counterweight and a row of shovel teeth located at the bottom of one side of the counterweight. In step S6, the counterweight is hung on the grab bucket of the trenching machine. The side of the counterweight facing the cross steel plate joint is provided with a second reserved groove for the protruding steel plate of the cross steel plate joint to pass through.

[0020] The shovel teeth have a cutting edge that protrudes outward from the counterweight and extends downward from the counterweight.

[0021] The wall brush includes a housing, a wire brush located on one side of the housing, and a third reserved groove through which a protruding steel plate of a cross-shaped steel plate joint passes. In step S8, the housing is hung on the grab bucket of the grooving machine, and the wire brush faces the side of the cross-shaped steel plate joint.

[0022] The box body is provided with two vertical rows of fork-shaped fasteners on one side, and the third reserved groove is formed between the two vertical rows of fork-shaped fasteners. The extended ends of the fork-shaped fasteners are all provided with wire brushes.

[0023] The wire brush is fixed to the fork-shaped fastener by bolts.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] (1) It is applicable to the removal of the surrounding concrete in the narrow space of the cross steel plate joint diaphragm wall. The steps are reasonably designed and closely combined to completely remove the surrounding concrete of the cross steel plate joint diaphragm wall, which reduces the construction difficulty and improves the construction efficiency.

[0026] (2) The technical problem of concrete bypass in cross-joint diaphragm wall has been solved in a comprehensive and systematic way.

[0027] (3) A cylindrical drill with a drill bit was used, which can cut around the concrete in both directions. The pressure is high when cutting, which can easily cut the concrete and greatly improve drilling efficiency.

[0028] (4) Use the trenching machine to grab a certain space at the flow path, and then lower the joint box so that the trenching machine grab bucket is stuck between the cross steel plate joint and the joint box. The reaction force provided by the joint box can completely prevent the trenching machine from deflecting when breaking the flow path concrete, thus preventing it from being unable to break the flow path concrete.

[0029] (5) The use of sharp teeth further increases the pressure when it comes into contact with the flowing concrete, and increases the ability to break the flowing concrete. At the same time, the sharp teeth are slender and can be used for concrete treatment in the deep concave corner of the cross plate joint.

[0030] (6) A wall scraper was used, which perfectly matched the profile of the cross steel plate joint. It has a large self-weight and strong impact force, and can easily and efficiently crush the surrounding concrete structure. When used in conjunction with a trenching machine, it greatly saves the cost of use.

[0031] (7) A wall brush is used, which perfectly matches the contour of the cross steel plate joint. It has a two-way wire brush. The wall brush can efficiently remove the residue in the flow area when it moves up and down, which greatly improves the slag removal efficiency. Attached Figure Description

[0032] Figure 1 This is a top view schematic diagram of a cross-joint ground ties.

[0033] Figure 2 This is a drilling diagram illustrating the construction method for removing concrete flowing around the diaphragm wall using a cross-shaped steel plate joint according to the present invention.

[0034] Figure 3 This is a bottom view of the cylindrical drill's structure.

[0035] Figure 4 This is a schematic diagram of the trenching method for removing concrete flowing around the ground diaphragm wall using a cross-shaped steel plate joint according to the present invention.

[0036] Figure 5 This is a front view schematic diagram of the sharp-toothed breaking of the surrounding concrete in the construction method of removing the concrete around the cross-shaped steel plate joint diaphragm wall of the present invention.

[0037] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0038] Figure 7 This is a schematic diagram of the main structure of the grab bucket of the trenching machine.

[0039] Figure 8 This is a top view schematic diagram of the sharp-toothed breaking of the surrounding concrete in the construction method of removing the concrete around the cross-shaped steel plate joint diaphragm wall of the present invention.

[0040] Figure 9 This is a schematic diagram of the method for removing the surrounding concrete in the cross-shaped steel plate joint diaphragm wall of the present invention, showing how a scraper removes the surrounding concrete.

[0041] Figure 10 This is a schematic diagram of the main structure of the wall scraper.

[0042] Figure 11 yes Figure 10 Schematic diagram of the cross-sectional structure of BB.

[0043] Figure 12 This is a schematic diagram of the wall brushing device used in the construction method for removing concrete around the cross-shaped steel plate joint diaphragm wall according to the present invention.

[0044] Figure 13 This is a side view of the wall brush.

[0045] Figure 14 yes Figure 13A cross-sectional view of the CC structure.

[0046] The labels in the diagram represent:

[0047] 1. Diaphragm wall; 2. Cross-shaped steel plate joint; 3. Flow-around concrete; 4. Crushed stone; 5. Soil; 51. Counterweight soil; 6. Cylindrical drill; 61. Drill bit; 611. Drill tip; 612. Diamond; 7. Trenching machine grab bucket; 71. Tenon; 72. Hook; 73. Hanging rope; 8. Sharp teeth; 81. First sharp tooth; 82. Second sharp tooth; 83. Third sharp tooth; 84. First reserved slot; 9. Wall scraper; 91. Main board; 92. First side plate; 93. Second side plate; 94. Folded panel; 95. Top panel; 96. Shovel teeth; 97. First lifting hole; 98. Second reserved slot; 10. Wall brush; 101. Box body; 102. Fork-type fastener; 103. Bolt; 104. Wire brush; 105. Second lifting hole; 106. Third reserved slot; 11. Retaining component. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] A construction method for removing concrete flowing around a diaphragm wall with a cross-shaped steel plate joint includes the following steps:

[0053] S1, such as Figure 2 As shown, holes are drilled along the length of the surrounding concrete 3, so that the overlap width of each hole protruding from both sides of the cross steel plate joint 2 is not less than 1 / 4 of the hole diameter.

[0054] S2, such as Figure 4 As shown, after drilling is completed, the grab bucket 7 of the trenching machine is used to trench the soil 5 (soil 5 on the stratum) outside the flow concrete 3 until an operating trench is formed on the outside of the flow concrete 3 that is lower than the flow concrete 3.

[0055] S3, such as Figure 5 As shown, retaining member 11 is installed on the side of the operating channel away from the surrounding concrete 3, and counter-pressure soil 51 is backfilled into the bottom of the operating channel to stabilize retaining member 11.

[0056] S4, such as Figures 5 to 8 As shown, sharp teeth 8 are installed on the side of the grab bucket 7 of the trenching machine facing the surrounding concrete 3. The middle of the sharp teeth 8 is provided with a first reserved groove 84 for the protruding steel plate of the cross steel plate joint 2 to pass through. The sharp teeth 8 are pressed tightly against the cross steel plate joint 2, and the entire surrounding concrete 3 structure is broken up by the up and down movement of the grab bucket 7 of the trenching machine.

[0057] S5. Replace the sharp teeth 8 on the grab bucket 7 of the trenching machine and lift out the retaining parts 11.

[0058] S6, such as Figure 9 As shown, the wall scraper 9 is hung on the grab bucket 7 of the trenching machine. The grab bucket 7 of the trenching machine is used to press the wall scraper 9 tightly against the cross steel plate joint 2, and the grab bucket 7 of the trenching machine is used to move up and down to remove all the remaining flowing concrete 3 on the cross steel plate joint 2.

[0059] S7. Remove the wall scraper 9 from the grab bucket 7 of the trenching machine and replace it with the wall brush 10.

[0060] S8, such as Figure 12 As shown, the grab bucket 7 of the trenching machine is used to press the wall brush 10 tightly against the cross steel plate joint 2, and the grab bucket 7 of the trenching machine is used to move up and down to completely remove the remaining sludge of the bypass concrete 3 on the cross steel plate joint 2.

[0061] This method for removing the surrounding concrete in the diaphragm wall of a cross-shaped steel plate joint is suitable for removing the surrounding concrete in the narrow space of the diaphragm wall of a cross-shaped steel plate joint. The steps are reasonably designed and closely integrated, which can completely remove the surrounding concrete in the diaphragm wall of the cross-shaped steel plate joint, reduce the construction difficulty and improve the construction efficiency.

[0062] In this embodiment, in step S1, a hole is drilled near the cross-shaped steel plate joint 2, drilling all the way to the bottom of the surrounding concrete 3 in one go, and then adjacent holes are drilled in sequence. This ensures the smooth progress of the subsequent sharp teeth 8 breaking through the surrounding concrete 3.

[0063] In this embodiment, as Figure 3 As shown, drilling is performed using a cylindrical drill 6. Multiple pairs of drill bits 61 are installed at the bottom of the cylindrical drill 6, with each pair of drill bits 61 spaced evenly around the center of the cylindrical drill 6. The cylindrical drill 6 is mounted on a rotary drilling rig, and drilling is achieved under the drive of the rotary drilling rig.

[0064] In this embodiment, the orientations of each pair of drill bits 61 are opposite. This ensures that the cylindrical drill 6 can effectively cut the surrounding concrete 3 during both forward and reverse rotations.

[0065] In this embodiment, there are multiple sets of sharp teeth 8, and each set of sharp teeth 8 is arranged at intervals along a straight line. The sharp teeth 8 in each set of sharp teeth 8 are arranged at intervals from bottom to top, and the outward convex length of the upper sharp teeth 8 is longer than that of the lower sharp teeth 8.

[0066] In this embodiment, the wall scraper 9 includes a counterweight and a row of scraper teeth 96 located at the bottom of one side of the counterweight. In S6, the counterweight is hung on the grab bucket 7 of the trenching machine. The side of the counterweight facing the cross steel plate joint 2 is provided with a second reserved groove 98 for the protruding steel plate of the cross steel plate joint 2 to pass through.

[0067] In this embodiment, the shovel tooth 96 has a cutting edge that protrudes outward from the counterweight and extends downward from the counterweight.

[0068] In this embodiment, the wall brush 10 includes a housing 101, a wire brush 104 disposed on one side of the housing 101, and a third reserved groove 106 through which the protruding steel plate of the cross steel plate joint 2 passes. In S8, the housing 101 is hung on the grab bucket 7 of the grooving machine, and the wire brush 104 faces the side of the cross steel plate joint 2.

[0069] In this embodiment, two vertical fork-type fasteners 102 are provided on one side of the housing 101, and a third reserved groove 106 is formed between the two vertical fork-type fasteners 102. The extended ends of the fork-type fasteners 102 are all provided with wire brushes 104.

[0070] In this embodiment, the wire brush 104 is fixed to the fork-shaped fastener 102 by bolts 103.

[0071] like Figures 1 to 14 As shown, a cross-shaped steel plate joint 2 is provided at the joint of the diaphragm wall 1. The space between the cross-shaped steel plate joint 2 and the soil 5 is filled with crushed stone 4 with a diameter of 8-10cm. During the pouring process, the concrete of the diaphragm wall 1 flows around into the crushed stone 4 through the gaps on both sides of the cross-shaped steel plate joint 2, resulting in flow-around concrete 3.

[0072] In this embodiment, a rotary drilling rig equipped with a cylindrical drill 6 (400-500mm in diameter) is first used to drill holes in the area surrounding the flowing concrete 3. The cylindrical drill 6 has a hollow structure, and multiple pairs of drill bits 61 are evenly spaced along the bottom circumference of the cylindrical drill 6. Each pair of drill bits 61 is fixed in a cross shape, and diamonds 612 are provided on the two oppositely oriented drill tips 611 of the cross-shaped drill bits 61 to ensure that the cylindrical drill 6 can effectively cut the flowing concrete 3 when rotating in both directions.

[0073] When the cylindrical drill 6 is used to process the surrounding concrete 3, the drill bit 61 should be placed as close as possible to the cross steel plate joint 2. The cylindrical drill 6 should drill to the bottom of the surrounding concrete 3 in one go, and then drill adjacent holes in sequence. The overlap width of two adjacent drill holes should not be less than 1 / 4 of the diameter of the cylindrical drill 6.

[0074] In this embodiment, after the cylindrical drill 6 completes drilling, the trenching machine grab bucket 7 is installed on the trenching machine. Driven by the trenching machine, it trenches the soil 5 outside the surrounding concrete 3. The trench depth is deeper than the bottom of the surrounding concrete 3, and the width of the trench is slightly greater than the width of the trenching machine grab bucket 7. A hook 72 is provided on the upper part of one side of the trenching machine grab bucket 7, and multiple protruding tenons 71 are arranged side by side on the bottom of one side.

[0075] The retaining component 11 is a joint box (made of steel). After the trenching machine finishes trenching, the joint box is hoisted and placed on the other side of the surrounding concrete 3 inside the trench section, ensuring that the joint box is tightly attached to the trench wall. The joint box is composed of individual sections, which are connected by pins. After the joint box is installed, a certain height of counterweight soil 51 is backfilled into the trench, not less than 2m high, to ensure that the bottom of the joint box is fixed.

[0076] The sharp teeth 8 are installed on all the tenons 71 on the grab bucket 7 of the grooving machine. Multiple sets of sharp teeth 8 are provided, with each set arranged at intervals along a straight line. The sharp teeth 8 in each set are arranged at intervals from bottom to top; that is, each set of sharp teeth 8 includes a first sharp tooth 81, a second sharp tooth 82, and a third sharp tooth 83. The first sharp tooth 81 is at the top, the second sharp tooth 82 is in the middle, and the third sharp tooth 83 is at the bottom. A first reserved groove 84 is provided in the middle of the sharp teeth 8. To ensure that the cross-shaped steel plate joint 2 has space to pass through, the sharp teeth 8 are arranged symmetrically to the first reserved groove 84.

[0077] The trenching machine grab bucket 7, equipped with sharp teeth 8, is placed into the trench. One row of sharp teeth 8 is in close contact with the cross steel plate joint 2, and the other end of the trenching machine grab bucket 7 is in close contact with the joint box. The trenching machine moves the trenching machine grab bucket 7 from top to bottom. Using gravity and the stress of the contraction of the trenching machine grab bucket 7, the remaining flow-around concrete 3 structure is continuously broken until the entire flow-around concrete 3 structure of the wall is completely broken.

[0078] In this embodiment, after the sharp teeth 8 have broken up the surrounding concrete 3, the joint box is lifted out. Then, a hanging rope 73 is passed through the first lifting hole 97 on the wall-mounting device 9 and hung on the hook 72 on the grab bucket 7 of the trenching machine. Figures 9 to 11 As shown, the wall scraper 9 includes a counterweight and a row of scraper teeth 96 located at the bottom of one side of the counterweight. The counterweight includes a main plate 91, a first side plate 92, a second side plate 93, a folding panel 94, and a top panel 95. All plate structures are made of 2cm thick steel plates.

[0079] All components of the scraper 9 are fixed to the main board 91. A first lifting hole 97, 5cm in diameter, is located at the top center of the main board 91. A second pre-reserved groove 98 is located on the side of the main board 91 facing the cross-plate joint 2, allowing the cross-plate joint 2 to pass through. On the side facing the cross-plate joint 2, two symmetrical cavity structures are formed by the first side plate 92, the folding panel 94, and the top panel 95, symmetrical to the second pre-reserved groove 98. The first side plate 92 is vertically welded to the main board 91 and consists of three steps: the top step is the first step, the middle step is the second step, and the bottom step is the third step. The width of each step increases progressively from top to bottom. The first and second steps transition vertically, while the second and third steps transition slopingly. The top panel 95 is welded to the first step, and the folding panel 94 is vertically welded to the third step and the sloping transition section. The folding panel 94 is flush with the bottom of the main board 91. A row of scraper teeth 96 is welded and fixed to the bottom of the folding panel 94.

[0080] On the side facing away from the cross-shaped steel plate joint 2, a single cavity structure is formed by the second side plate 93 and the folded panel 94. The second side plate 93 is composed of two steps. The upper part is the first step, and the lower part is the second step. The second step is wider than the first step, and the interface between the two steps is a sloping transition. The folded panel 94 is vertically welded to the second step and the sloping transition section, and the folded panel 94 is flush with the bottom of the main plate 91.

[0081] The wall scraper 9 uses the grab bucket 7 of the trenching machine to move up and down in the trench, and uses gravity and scraper teeth 96 to continuously scrape away the surrounding concrete 3 on the cross steel plate joint 2.

[0082] In this embodiment, after the wall scraper 9 is used, it is removed from the grab bucket 7 of the trenching machine, and the wall brush 10 is hung on the hook 72 of the grab bucket 7 of the trenching machine by the hanging rope 73. The wall brush 10 includes a housing 101, a fork-shaped fastener 102, a bolt 103, a wire brush 104, a second lifting hole 105, and a third reserved slot 106. The housing 101 is made of 2cm thick steel plate, the fork-shaped fastener 102 is made of 1cm thick steel plate, and the bolt 103 is an M12 to M20 bolt.

[0083] The housing 101 is a hollow square structure. A second lifting hole 105 is located at the top center of the two faces perpendicular to the cross-shaped steel plate joint 2. On a single vertical surface facing the cross-shaped steel plate joint 2, fork-shaped fasteners 102 and a third reserved groove 106 are provided. The third reserved groove 106 is located in the center of the surface to allow the cross-shaped steel plate joint 2 to pass through. The fork-shaped fasteners 102 are arranged at equal intervals from top to bottom, symmetrically distributed along the third reserved groove 106. All fork-shaped fasteners 102 are welded to the surface of the housing 101. Each fork-shaped fastener 102 has two grooves facing upwards and downwards, respectively. Bolt holes are evenly spaced on the surface of the fork-shaped fasteners 102. A portion of a wire brush 104 fills the grooves of the fork-shaped fasteners 102, completely filling all groove surfaces. The wire brush 104 is then fixed to the fork-shaped fasteners 102 by bolts 103. The other portion of the wire brush 104 is located on the outside.

[0084] The wall brush 10 uses the grab bucket 7 of the troughing machine to closely adhere to the cross-shaped steel plate joint 2. By moving the grab bucket 7 up and down, it thoroughly cleans the residual residue on the surface of the cross-shaped steel plate joint 2. Because the wall brush 10 is equipped with steel wire brushes 104 facing two directions, it can effectively remove surface residue during both up and down movements.

[0085] The specific steps are as follows:

[0086] Step 1: Place the cylindrical drill 6 with the cross-type drill bit 61 on the flow-around concrete 3 using a rotary drilling machine, ensuring that the cylindrical drill 6 is in close contact with the cross steel plate joint 2. Drill the flow-around concrete 3 from top to bottom by rotating the cylindrical drill 6, with the overlap width of each hole not less than 1 / 4 of the hole diameter.

[0087] The second step is to use the grab bucket 7 of the trenching machine to grab a bucket-wide section of soil from the outside of the flow-around concrete 3 after drilling the hole with the cylindrical drill 6, until the bottom of the flow-around concrete 3 is reached.

[0088] The third step is to hoist the joint box into the trench wall away from the surrounding concrete 3, and backfill the trench with a certain height of counter-pressure soil 51 to stabilize the joint box.

[0089] Step 4: Install the sharp teeth 8 onto a row of tenons 71 on one side of the trenching machine grab bucket 7, then press the sharp teeth 8 tightly against the cross steel plate joint 2, move the trenching machine grab bucket 7 up and down and rotate the trenching machine grab bucket 7, thereby destroying the entire surrounding concrete 3 structure.

[0090] Step 5: Replace the sharp teeth 8 on the grab bucket 7 of the trenching machine, lift out the connector box, and use the hanging rope 73 to hang the wall scraper 9 on the hook 72 of the grab bucket 7 of the trenching machine.

[0091] Step 6: Using the grab bucket 7 of the trenching machine, the wall scraper 9 is pressed tightly against the cross steel plate joint 2. The grab bucket 7 of the trenching machine moves up and down and, combined with gravity, removes all the remaining flowing concrete 3 on the cross steel plate joint 2.

[0092] Step 7: Replace the wall scraper 9 on the grab bucket 7 of the trenching machine, and use the hanging rope 73 to hang the wall scraper 10 on the hook 72 of the grab bucket 7 of the trenching machine.

[0093] Step 8: Use the grab bucket 7 of the trenching machine to press the wall brush 10 tightly against the cross steel plate joint 2. Use the grab bucket 7 of the trenching machine to move up and down and combine with gravity to completely remove the remaining flow concrete 3 residue on the cross steel plate joint 2.

[0094] Step 9: Normal construction of the diaphragm wall at three locations using bypass concrete.

[0095] The present invention provides a comprehensive and systematic solution to the technical problem of concrete bypass in cross-shaped steel plate joint diaphragm walls. It utilizes a cylindrical drill 6 with a drill bit 61, capable of bidirectional cutting of the bypass concrete 3. The high pressure during cutting allows for easy severing of the concrete, significantly improving drilling efficiency. A trenching machine creates space at the bypass point, and then the joint box is lowered, allowing the trenching machine's grab bucket 7 to engage between the cross-shaped steel plate joint 2 and the joint box. The reaction force provided by the joint box completely prevents the trenching machine from deviating during the breaking of the bypass concrete 3, thus preventing failure to break the bypass concrete 3. Sharp teeth are used. This further increases the pressure when it contacts the surrounding concrete 3, enhancing its ability to break the surrounding concrete 3. Simultaneously, the sharp teeth have a slender structure, making them suitable for concrete treatment in the deeper concave corners of the cross-plate joint 2. A wall scraper 9 is used, perfectly matching the contour of the cross-plate joint 2. It possesses a large self-weight and strong impact force, easily and efficiently breaking the surrounding concrete 3 structure. Combined with a trenching machine, it significantly reduces operating costs. A wall brush 10 is also used, perfectly matching the contour of the cross-plate joint 2. It features a bidirectional wire brush 104, and the wall brush 10 can efficiently remove residue from the surrounding area when moving up and down, greatly improving cleaning efficiency.

[0096] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A construction method for removing a flow- around concrete of a cross-steel-plate joint ground wall, characterized by, It comprises the following steps: S1, drilling holes along the length direction of the flow concrete (3) to make the lap joint width of each hole on both sides of the cross steel plate joint (2) protruding steel plate not less than 1 / 4 hole diameter; S2, after the drilling is completed, the trenching machine grab (7) is used to grab the trench of the soil body (5) outside the flow concrete (3) until the operation trench is formed on the outside of the flow concrete (3) which is lower than the flow concrete (3); S3, the soil retaining member (11) is installed on the trench wall away from the flow concrete (3) side of the operation trench, and the back pressure soil (51) is backfilled to the bottom of the operation trench to stabilize the soil retaining member (11); S4, the sharp teeth (8) are installed on the side of the trenching machine grab (7) facing the flow concrete (3), the middle part of the sharp teeth (8) is provided with a first reserved slot (84) for the protruding steel plate of the cross steel plate joint (2) to pass through, the sharp teeth (8) are tightly attached to the cross steel plate joint (2), and the whole flow concrete (3) structure is broken by moving the trenching machine grab (7) up and down; S5, the sharp teeth (8) on the trenching machine grab (7) are replaced, and the soil retaining member (11) is lifted out; S6, the wall shoveling device (9) is hung on the trenching machine grab (7), the wall shoveling device (9) is tightly attached to the cross steel plate joint (2) by the trenching machine grab (7), and the remaining flow concrete (3) on the cross steel plate joint (2) is completely removed by moving the trenching machine grab (7) up and down; S7, the wall shoveling device (9) on the trenching machine grab (7) is removed, and the wall brushing device (10) is replaced; S8, the wall brushing device (10) is tightly attached to the cross steel plate joint (2) by the trenching machine grab (7), and the residual flow concrete (3) residue on the cross steel plate joint (2) is completely removed by moving the trenching machine grab (7) up and down.

2. The construction method for removing the concrete around the cross steel plate joint diaphragm wall according to claim 1, characterized in that: In S1, holes are drilled near the cross steel plate joint (2), and once drilling is performed to the bottom of the flow concrete (3), and then adjacent holes are drilled in sequence.

3. The construction method for removing the concrete around the cross steel plate joint diaphragm wall according to claim 2, characterized in that: Drilling is performed by using a cylindrical drill (6), and the bottom of the cylindrical drill (6) is provided with a plurality of pairs of drill bits (61), and each pair of drill bits (61) is arranged at equal intervals around the center of the cylindrical drill (6).

4. The construction method for removing the concrete around the cross steel plate joint diaphragm wall according to claim 3, characterized in that: Each pair of drill bits (61) is oppositely directed.

5. The removal construction method of the cross steel plate joint diaphragm wall around flow concrete according to any one of claims 1 to 4, characterized in that: The sharp teeth (8) are provided in multiple groups, each group of sharp teeth (8) is arranged along a straight line at intervals, the sharp teeth (8) in each group of sharp teeth (8) are arranged at intervals from bottom to top, and the outer protruding length of the upper sharp teeth (8) is longer than that of the lower sharp teeth (8).

6. The removal construction method of the cross steel plate joint diaphragm wall around flow concrete according to any one of claims 1 to 4, characterized by: The wall shoveling device (9) comprises a counterweight and a row of shoveling teeth (96) arranged on one side of the bottom of the counterweight, and in S6, the counterweight is hung on the trenching machine grab (7), and the side of the counterweight facing the cross steel plate joint (2) is provided with a second reserved slot (98) for the protruding steel plate of the cross steel plate joint (2) to pass through.

7. The construction method for removing the concrete around the cross steel plate joint diaphragm wall according to claim 6, characterized in that: The shoveling teeth (96) have a blade portion protruding outward from the counterweight and extending downward below the counterweight.

8. The removal construction method of the cross steel plate joint diaphragm wall around flow concrete according to any one of claims 1 to 4, characterized by: The brush waller (10) comprises a box (101), a steel wire brush (104) arranged on one side of the box (101), and a third reserved slot (106) for the protruding steel plate of the cross steel plate joint (2) to pass through, wherein the box (101) is hung on the grab bucket (7) of a slot forming machine, and the steel wire brush (104) faces one side of the cross steel plate joint (2).

9. The construction method for removing the flow- around concrete of a cross steel plate joint diaphragm wall according to claim 8, characterized in that: Two vertical fork fasteners (102) are arranged on one side of the box (101), the third reserved slot (106) is formed between the two vertical fork fasteners (102), and the outer end of each fork fastener (102) is provided with a steel wire brush (104).

10. The removal construction method of the cross steel plate joint diaphragm wall around flow concrete according to claim 9, characterized in that: The steel wire brush (104) is fixed on the fork fastener (102) through a bolt (103).

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