Rotary excavating and wall brushing method for cross-shaped steel plate joint of underground diaphragm wall

Abstract

The invention relates to the technical field of underground diaphragm wall construction, and discloses an underground diaphragm wall cross-shaped steel plate connector rotary excavating wall brushing method which comprises the following construction steps that (1) an underground diaphragm wall is provided with a plurality of T-shaped groove sections, a straight groove section is formed between every two T-shaped groove sections, and cross-shaped steel plate connectors are arranged between the T-shaped groove sections and the straight groove sections and provided with cleaning walls and combination walls; (2) concrete is poured into the T-shaped groove section, and the wall brushing device is connected to the power structure; the wall brushing device is provided with a connector and a brushing part, and a plurality of bristle bundles are arranged on the brushing part; (3) the wall brushing device is arranged in the straight groove section through the power structure, and bristle bundles are driven to brush the cleaning wall up and down in a reciprocating mode; (4) the construction step (3) is repeated till the mud blocks with the set size are not attached to the bristle bundles; (5) the wall brushing device is lifted out of the straight groove section, and circulating slurry hole cleaning is conducted on the straight groove section till the thickness of sediment at the bottom is lower than the set thickness; the brushing part is provided with a plurality of bristle bundles, so that the wall brushing device is attached to a cleaning wall, and a better cleaning effect is achieved.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of underground continuous wall construction, specifically, to a method for rotary drilling and wall brushing of cross steel plate joints of underground continuous walls. Background Art

[0002] As an important form of deep foundation and support structure, underground continuous wall has been widely used in various projects, especially for high slopes in complex environments. Modular combined underground continuous wall is highly favored because of its greater rigidity, better anti-seepage performance and ability to form permanent support.

[0003] Cross steel plate joints are usually used between the trench sections of the modular combined underground continuous wall to form an integral structure of adjacent underground continuous wall trench sections, jointly bearing the vertical load of the superstructure while having good anti-seepage performance.

[0004] However, during the construction process, it is difficult to avoid the phenomenon of concrete seeping into adjacent trench sections and adhering to the cross steel plate joints. If it is not removed in time, mud will be trapped, leading to water leakage in the underground continuous wall during excavation. Therefore, effective wall brushing measures must be taken.

[0005] In the prior art, common wall brushes are mainly suitable for conventional I-beam joints, but are less suitable for special shapes such as cross joints. Common wall brushing methods include impact-type wall brushing, such as using a homemade wire brush on the side of a square drill bit or a square hammer to remove concrete attached to the I-beam groove by impact, or using a crane to lift the wall brush up and down repeatedly to flush;

[0006] However, when the wire brush encounters irregularly distributed concrete blocks, the suspended wall brush is prone to sliding along the layer, and cannot perform the wall brushing operation stably, resulting in unsatisfactory wall brushing effect; and when encountering concrete with a certain strength, the wire brush has insufficient brushing force and it is difficult to effectively remove the attached concrete, which further affects the wall brushing effect. Moreover, the wall brush also has the problem of difficult verticality control, which can easily lead to uneven wall brushing and affect the overall quality and performance of the underground continuous wall. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for rotary drilling and wall brushing of the cross steel plate joints of an underground continuous wall, aiming to solve the problem in the prior art that the wall brush has a poor cleaning effect when facing concrete attached to the cross steel plate joints.

[0008] The present invention is achieved by a method for rotary excavation and wall brushing of a cross steel plate joint of an underground continuous wall, comprising the following construction steps:

[0009] 1) The underground continuous wall has a plurality of T-slot sections arranged facing each other, a straight slot section is formed between two T-slot sections arranged spaced apart, the cross steel plate joint is arranged between the T-slot section and the straight slot section, the cross steel plate joint has a clean wall facing the straight slot section, and the cross steel plate joint has a joining wall facing the T-slot section;

[0010] pouring concrete into the T-groove section, wherein the concrete fills the T-groove section and covers the joining wall;

[0011] 2) After pouring concrete into the T-slot section for a set time, connect the wall brush to the power structure; the upper portion of the wall brush has a connector connected to the power structure, and the lower portion of the wall brush has a brushing portion, the brushing portion is provided with a plurality of bristle bundles, and the plurality of bristle bundles are arranged in parallel along the height direction of the brushing portion;

[0012] 3) The power structure places the wall brush in the straight groove section, and the multiple bristle bundles face the clean wall and abut against the clean wall. The power structure drives the wall brush to move back and forth in the straight groove section, and the multiple bristle bundles brush the clean wall back and forth;

[0013] 4) Repeat step 3) until no mud lumps of a set size adhere to the plurality of bristle bundles when the wall brush is pulled out of the straight groove section;

[0014] 5) The wall brush is lifted out of the straight trough section, and the straight trough section is cleaned with circulating mud until the thickness of the sediment at the bottom of the straight trough section is lower than the set thickness.

[0015] Furthermore, in the construction step 2), the connecting head has a connecting hole with a top opening, and the connecting hole is arranged to extend longitudinally; the power structure includes a drill rod, the drill rod is inserted into the connecting hole, and is fixedly connected to the connecting head as a whole, and the drill rod and the connecting hole are arranged to extend coaxially.

[0016] Furthermore, in the construction step 2), pin holes are respectively provided on both sides of the connector. After the drill rod is inserted into the connector hole, a pin shaft is passed through the pin hole and the drill rod to fix the drill rod and the connector into one piece.

[0017] Furthermore, in the construction step 2), the drill rod is connected to a rotary drilling rig; in the construction step 3), the rotary drilling rig drives the drill rod to move back and forth up and down, and the drill rod synchronously drives the wall brush to move back and forth up and down in the straight groove section.

[0018] Furthermore, the connecting head is docked at the top of the brushing part, and a plurality of corbel plates are connected to the outer periphery of the connecting head. The plurality of corbel plates are arranged around the circumference of the connecting head at intervals, and the bottom of the corbel plates is connected to the top of the brushing part.

[0019] Furthermore, in the construction step 2), the brushing portion is in the shape of a straight cylinder arranged longitudinally, and the brushing portion has a longitudinal wall arranged longitudinally, and the plurality of bristle bundles are connected to the longitudinal wall.

[0020] Furthermore, in the construction step 2), a plurality of end sections are provided on the longitudinal wall, and the plurality of end sections are arranged in an array on the longitudinal wall; the inner ends of the bristle bundles form fixed sections, which are embedded and fixed in the end sections, and the outer ends of the bristle bundles form exposed sections extending to the outside of the end sections;

[0021] In the construction step 3), when the wall brush moves back and forth in the straight groove section, the exposed section abuts against the cleaning wall and performs back and forth brushing.

[0022] Furthermore, in the construction step 2), the brushing portion has a diverging wall arranged away from the longitudinal wall, and an inclined triangular tube is provided on the diverging wall; the triangular tube is arranged with the same width as the brushing portion, and the bottom of the triangular tube is arranged flush with the bottom of the brushing portion;

[0023] The inner side of the triangular tube is docked on the away wall, and the outer side of the triangular tube has an inclined plate, the upper end of the inclined plate is docked on the away wall, and along the direction of the brushing part from top to bottom, the lower end of the inclined plate is inclined away from the away wall.

[0024] Furthermore, in the construction step 2), the brushing portion has a longitudinal cavity, which passes through the bottom of the brushing portion to form an inner bottom opening; the triangular tube has a triangular cavity, which passes through the bottom of the triangular tube to form an outer bottom opening; the longitudinal wall is provided with a plurality of directional openings, which pass through the longitudinal wall and are located between adjacent bristle bundles;

[0025] In the construction step 3), when the wall brush moves downward in the straight groove section, the mud in the straight groove section enters the longitudinal cavity through the inner bottom opening, and impacts the cleaning wall and the brush bundle through multiple openings, so that the mud blocks on the brush bundle and the cleaning wall are separated.

[0026] Furthermore, in the construction step 2), a plurality of elastic sheets arranged in a curved manner are provided in the longitudinal cavity, the elastic sheets being located above the opening; the inner ends of the elastic sheets are butted against the inner sidewalls of the longitudinal cavity, and the outer ends of the elastic sheets are bent and extended downward; the elastic sheets and the inner sidewalls of the longitudinal cavity enclose a guide area, and the opening is aligned and connected to the guide area;

[0027] In the construction step 3), when the wall brush moves downward in the straight groove section, the mud in the straight groove section enters the longitudinal cavity through the inner bottom opening, and the mud flows to the guide area. The elastic sheet elastically deforms upward, synchronously driving the mud in the guide area to be accelerated and ejected toward the opening.

[0028] Compared with the prior art, the rotary excavation and wall brushing method for the cross steel plate joint of the underground continuous wall provided by the present invention has the following technical effects:

[0029] 1) The brushing part of the wall brush is equipped with multiple flush-arranged and specially shaped bristle bundles specifically for the cross steel plate joints, so that the wall brush can closely fit the cleaning wall of the cross steel plate joints, ensuring that the wall brush can evenly and comprehensively contact the cleaning wall, thereby achieving better cleaning effect;

[0030] 2) The power structure is used to drive the wall brush to move back and forth in the straight groove section, so that the bristle bundle can brush the clean wall up and down. This reciprocating motion can continuously and evenly apply brush force, effectively removing concrete attached to the clean wall, improving the wall brushing efficiency, and reducing the mud inclusion phenomenon caused by concrete seepage and adhesion, thereby avoiding water leakage in the underground continuous wall during subsequent construction;

[0031] 3) Since the wall brush is stably placed in the straight groove section through the power structure, and the bristle bundle can evenly abut the cleaning wall, the uneven wall brushing caused by the wall brush sliding along the layer is avoided, which not only improves the wall brushing effect, but also ensures the verticality control of the construction process, further improving the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the process of the rotary excavation and wall brushing method for the cross steel plate joint of the underground continuous wall provided by the present invention;

[0033] Figure 2 This is a schematic cross-sectional view of the T-slot section of the underground continuous wall provided by the present invention after pouring concrete;

[0034] Figure 3 It is a structural schematic diagram of the wall brush provided by the present invention;

[0035] Figure 4 is a partial cross-sectional schematic diagram of the longitudinal cavity provided by the present invention;

[0036] In the figure: T-slot section 100, straight slot section 101, cleaning wall 102, combining wall 103, connector 104, connecting hole 105, drill rod 106, pin hole 107, corbel plate 108;

[0037] Brushing part 200, bristle bundle 201, longitudinal wall 202, facing opening 203, end head 204, facing away from wall 205;

[0038] Triangular tube 300 , longitudinal cavity 301 , inner bottom opening 302 , triangular cavity 303 , outer bottom opening 304 , elastic sheet 305 , guide area 306 . DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0041] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] Reference Figure 1-4 The figure shows a preferred embodiment of the present invention.

[0043] The underground continuous wall cross steel plate joint rotary excavation and wall brushing method includes the following construction steps:

[0044] 1) The underground continuous wall has a plurality of T-slot sections 100 arranged facing each other, a straight slot section 101 is formed between two T-slot sections 100 arranged spaced apart, a cross steel plate joint is arranged between the T-slot section 100 and the straight slot section 101, and the cross steel plate joint has a clean wall 102 facing the straight slot section 101 and a joining wall 103 facing the T-slot section 100;

[0045] Pour concrete into the T-slot section 100 , so that the concrete fills the T-slot section 100 and covers the connecting wall 103 ;

[0046] 2) After pouring concrete into the T-slot section 100 for a set time, connect the wall brush to the power structure; the upper part of the wall brush has a connector 104 connected to the power structure, and the lower part of the wall brush has a brushing part 200, which is provided with a plurality of bristle bundles 201. The plurality of bristle bundles 201 are arranged in a straight line along the height direction of the brushing part 200;

[0047] 3) The power structure places the wall brush in the straight groove section 101, and the multiple bristle bundles 201 face the clean wall 102 and abut against the clean wall 102. The power structure drives the wall brush to move up and down in the straight groove section 101, and the multiple bristle bundles 201 brush the clean wall 102 up and down;

[0048] 4) Repeat step 3) until no mud lumps of a set size adhere to the bristle bundles 201 when the wall brush is pulled out of the straight groove section 101;

[0049] 5) The wall brush is lifted out of the straight trough section 101 and the hole of the straight trough section 101 is cleaned with circulating mud until the thickness of the sediment at the bottom of the straight trough section 101 is lower than the set thickness.

[0050] The above-mentioned underground continuous wall cross steel plate joint rotary excavation and wall brushing method has the following technical effects:

[0051] 1) The brushing part 200 of the wall brush is provided with multiple flush-arranged brush bundles 201 of a special shape specifically for the cross steel plate joint, so that the wall brush can closely fit the cleaning wall 102 of the cross steel plate joint, ensuring that the wall brush can evenly and comprehensively contact the cleaning wall 102, thereby achieving a better cleaning effect;

[0052] 2) A power structure is used to drive the wall brush to move back and forth in the straight groove section 101, so that the bristle bundle 201 can brush the clean wall 102 back and forth. This reciprocating motion can continuously and evenly apply brush force, effectively removing concrete attached to the clean wall 102, improving the wall brushing efficiency, reducing the mud inclusion phenomenon caused by the adhesion of concrete, and thus avoiding water leakage in the underground continuous wall during subsequent construction;

[0053] 3) Since the wall brush is stably placed in the straight groove section 101 through the power structure, and the bristle bundle 201 can evenly abut the clean wall 102, the uneven wall brushing caused by the wall brush sliding along the layer is avoided, which not only improves the wall brushing effect, but also ensures the verticality control of the construction process, further improving the construction quality.

[0054] In this embodiment, in construction step 2), the connecting head 104 has a connecting hole 105 with a top opening, and the connecting hole 105 is arranged to extend longitudinally; the power structure includes a drill rod 106, the drill rod 106 is inserted into the connecting hole 105, and is fixedly connected to the connecting head 104 as a whole, and the drill rod 106 and the connecting hole 105 are arranged to extend coaxially.

[0055] In this way, it can ensure that the power transmission of the wall brush is more uniform and efficient when it moves up and down in the straight groove section 101, avoiding the shaking of the wall brush or uneven wall brushing caused by unstable connection, thereby improving the stability and reliability of the wall brushing.

[0056] In this embodiment, in construction step 2), pin holes 107 are respectively provided on both sides of the connecting head 104. When the drill rod 106 is inserted into the connecting hole 105, the pin shaft is passed through the pin hole 107 and the drill rod 106 to fix the drill rod 106 and the connecting head 104 into one.

[0057] By connecting the drill rod 106 with the pin shaft passing through the pin hole 107, the connection strength between the drill rod 106 and the connecting head 104 is enhanced, ensuring that the two will not loosen or fall off during the construction process. This not only improves the stability of the wall brush, but also enhances its reliability in complex construction environments, effectively avoids construction interruptions caused by loose connections, and improves construction efficiency.

[0058] In this embodiment, in construction step 2), the drill rod 106 is connected to the rotary drilling rig; in construction step 3), the rotary drilling rig drives the drill rod 106 to move back and forth up and down, and the drill rod 106 synchronously drives the wall brush to move back and forth up and down in the straight groove section 101.

[0059] A rotary drilling rig is used as a power source, and its powerful power drives the drill rod 106 to move up and down, thereby driving the wall brush to perform efficient wall brushing operations in the straight groove section 101. This not only provides sufficient power to ensure that the wall brush moves stably in the straight groove section 101, but also improves the wall brushing effect.

[0060] In actual construction, due to the large rigidity of the drill rod connected to the rotary drilling rig, the wall brush has a strong flushing force with the help of the rotary drilling rig, and can forcibly remove concrete blocks when encountering concrete blocks.

[0061] In this embodiment, the connecting head 104 is docked at the top of the brushing part 200, and a plurality of corbel plates 108 are connected to the outer periphery of the connecting head 104. The plurality of corbel plates 108 are arranged at intervals along the circumference of the connecting head 104, and the bottom of the corbel plates 108 is connected to the top of the brushing part 200.

[0062] By providing the corbel plate 108, the connection area and connection strength between the connecting head 104 and the brushing part 200 are increased, the overall stability of the wall brush is improved, damage or deformation of the wall brush due to weak connection parts is effectively avoided, and the service life of the wall brush is extended.

[0063] In this embodiment, in construction step 2), the brushing portion 200 is in the shape of a straight cylinder arranged longitudinally. The brushing portion 200 has a longitudinal wall 202 arranged longitudinally, and a plurality of bristle bundles 201 are connected to the longitudinal wall 202 .

[0064] In this way, when the wall brush moves in the straight groove section 101, the bristle bundle 201 can effectively remove concrete attachments on the clean wall 102, thereby improving the uniformity and thoroughness of the wall brushing and achieving a better cleaning effect of the wall brush.

[0065] In this embodiment, in construction step 2), a plurality of end portions 204 are provided on the longitudinal wall 202, and the plurality of end portions 204 are arranged in an array on the longitudinal wall 202; the inner ends of the bristle bundles 201 form fixed sections, which are embedded and fixed in the end portions 204, and the outer ends of the bristle bundles 201 form exposed sections extending to the outside of the end portions 204;

[0066] Construction step 3): When the wall brush moves back and forth in the straight groove section 101 , the exposed section abuts against the cleaning wall 102 and performs a back and forth brushing motion.

[0067] The fixed section of the bristle bundle 201 is embedded and fixed in the end section 204 through the end section 204, which not only enhances the fixing stability of the bristle bundle 201, but also enables the exposed section to better abut the clean wall 102 for brushing, ensuring that the bristle bundle 201 can fit tightly against the clean wall 102 during the wall brushing process, thereby more effectively removing the attached concrete.

[0068] In this embodiment, the bristle bundle material is steel wire rope, which is 6×19+FC (6 strands, 19 strands per strand) type, with an outer diameter of 25 mm per strand. The entire wall brush device is provided with 36 bristle bundles arranged in a plum blossom shape, and each exposed section has a length of 300 mm.

[0069] In this way, the steel wire rope maintains high strength while also having a certain flexibility. Combined with the plum blossom-shaped arrangement, the distribution of the brush bristles on the cleaning wall is more even, which can fully cover the surface of the cleaning wall and avoid dead corners in brushing the wall. In addition, the exposed length of the exposed section ensures that there is sufficient contact area and range of action during the wall brushing process, thereby further improving the wall brushing effect.

[0070] In this embodiment, in construction step 2), the brushing portion 200 has a separating wall 206 disposed away from the longitudinal wall 202, and an inclined triangular tube 300 is provided on the separating wall 206; the triangular tube 300 is arranged with the same width as the brushing portion 200, and the bottom of the triangular tube 300 is arranged flush with the bottom of the brushing portion 200;

[0071] The inner side of the triangular tube 300 is docked on the away wall 206, and the outer side of the triangular tube 300 has an inclined plate, the upper end of the inclined plate is docked on the away wall 206, and the lower end of the inclined plate is inclined away from the away wall 206 along the top-down direction of the brushing part 200.

[0072] By setting the triangular cylinder 300 and the inclined plate, not only the structural strength of the brushing part 200 is enhanced, but also additional guiding and supporting functions are provided for the wall brusher, so that the wall brusher is more stable when moving in the straight groove section 101, and can better adapt to complex construction environments, avoiding poor wall brushing effects caused by structural instability, thereby improving the overall performance of the wall brusher.

[0073] In this embodiment, in construction step 2), the brushing portion 200 has a longitudinal cavity 301, which passes through the bottom of the brushing portion 200 to form an inner bottom opening 302; the triangular tube 300 has a triangular cavity 303, which passes through the bottom of the triangular tube 300 to form an outer bottom opening 304; the longitudinal wall 202 is provided with a plurality of directional openings 203, which pass through the longitudinal wall 202 and are located between adjacent bristle bundles 201;

[0074] In construction step 3), when the wall brush moves downward in the straight groove section 101, the mud in the straight groove section 101 enters the longitudinal cavity 301 through the inner bottom opening 302, and impacts the cleaning wall 102 and the brush bundle 201 through multiple directional openings 203, so that the mud blocks on the brush bundle 201 and the mud blocks on the cleaning wall 102 are separated.

[0075] In this way, the wall brush can effectively use the flow of mud to assist in wall brushing during movement, which can not only remove the mud blocks on the bristle bundle 201 and the cleaning wall 102, but also further improve the wall brushing effect.

[0076] In this embodiment, in construction step 2), a plurality of elastic sheets 305 arranged in a curved arrangement are provided in the longitudinal cavity 301. The elastic sheets 305 are located above the opening 203. The inner ends of the elastic sheets 305 are butted against the inner sidewalls of the longitudinal cavity 301, and the outer ends of the elastic sheets 305 are bent and extended downward. The elastic sheets 305 and the inner sidewalls of the longitudinal cavity 301 enclose a guide region 306, which is aligned and communicates with the guide region 306 toward the opening 203.

[0077] In construction step 3), as the wall brush moves downward in the straight groove section 101, the mud in the straight groove section 101 enters the longitudinal cavity 301 through the inner bottom opening 302, and the mud flows to the guide area 306. The elastic sheet 305 elastically deforms upward, synchronously driving the mud in the guide area 306 to be accelerated and ejected toward the opening 203.

[0078] The elastic sheet 305 further optimizes the flow path of the mud, so that after entering the longitudinal cavity 301, the mud can be accelerated to be ejected through the elastic deformation of the elastic sheet 305. This not only increases the impact force of the mud on the cleaning wall 102 and the brush bundle 201, but also can more effectively remove the attached mud blocks, further improving the wall brushing effect.

[0079] In this embodiment:

[0080] 1) The cross steel plate joint used is used to connect the straight slot section 101 and the T slot section 100. It is welded with 20mm thick steel plates, and the total width of the two-way steel plates is 860mm.

[0081] 2) According to the size of the cross steel plate joint, in order to enable the wall brush to be placed in the clean wall 102 of the cross steel plate joint for wall brushing, the sizes of the brushing part 200 and the triangular cylinder 300 need to be matched. The brushing part 200 is made of wear-resistant steel plate with a thickness of 30mm and a specific size of 420×500×1000mm;

[0082] 3) The size of the triangular cylinder 300 is 420×420×420 mm, so that the wall brush can be placed appropriately between the straight groove section 101 and the cleaning wall 102, which can better control the verticality and enhance the wall brushing effect.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall, characterized in that: The construction steps include: 1) The underground continuous wall has a plurality of T-slot sections arranged facing each other, a straight slot section is formed between two T-slot sections arranged spaced apart, the cross steel plate joint is arranged between the T-slot section and the straight slot section, the cross steel plate joint has a clean wall facing the straight slot section, and the cross steel plate joint has a joining wall facing the T-slot section; pouring concrete into the T-groove section, wherein the concrete fills the T-groove section and covers the joining wall; 2) After pouring concrete into the T-slot section for a set time, connect the wall brush to the power structure; the upper portion of the wall brush has a connector connected to the power structure, and the lower portion of the wall brush has a brushing portion, the brushing portion is provided with a plurality of bristle bundles, and the plurality of bristle bundles are arranged in parallel along the height direction of the brushing portion; 3) The power structure places the wall brush in the straight groove section, and the multiple bristle bundles face the clean wall and abut against the clean wall. The power structure drives the wall brush to move back and forth in the straight groove section, and the multiple bristle bundles brush the clean wall back and forth; 4) Repeat step 3) until no mud lumps of a set size adhere to the plurality of bristle bundles when the wall brush is pulled out of the straight groove section; 5) The wall brush is lifted out of the straight trough section, and the straight trough section is cleaned with circulating mud until the thickness of the sediment at the bottom of the straight trough section is lower than the set value.

2. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 1, characterized in that: In the construction step 2), the connecting head has a connecting hole with a top opening, and the connecting hole is arranged to extend longitudinally; the power structure includes a drill rod, the drill rod is inserted into the connecting hole, and is fixedly connected to the connecting head as a whole, and the drill rod and the connecting hole are arranged to extend coaxially.

3. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 2, characterized in that: In the construction step 2), pin holes are respectively provided on both sides of the connector. After the drill rod is inserted into the connector hole, a pin shaft is passed through the pin hole and the drill rod to fix the drill rod and the connector together.

4. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 2, characterized in that: In the construction step 2), the drill rod is connected to a rotary drilling rig; in the construction step 3), the rotary drilling rig drives the drill rod to move back and forth up and down, and the drill rod synchronously drives the wall brush to move back and forth up and down in the straight groove section.

5. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to any one of claims 1 to 4, characterized in that: The connecting head is docked at the top of the brushing part. The outer periphery of the connecting head is connected with a plurality of corbel plates. The plurality of corbel plates are arranged around the circumference of the connecting head at intervals. The bottom of the corbel plates is connected to the top of the brushing part.

6. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to any one of claims 1 to 4, characterized in that: In the construction step 2), the brushing portion is in the shape of a straight cylinder arranged longitudinally, and the brushing portion has a longitudinal wall arranged longitudinally, and a plurality of the bristle bundles are connected to the longitudinal wall.

7. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 6, characterized in that: In the construction step 2), the longitudinal wall is provided with a plurality of end sections, which are arranged in an array on the longitudinal wall; the inner ends of the bristle bundles form fixed sections, which are embedded and fixed in the end sections, and the outer ends of the bristle bundles form exposed sections extending to the outside of the end sections; In the construction step 3), when the wall brush moves back and forth in the straight groove section, the exposed section abuts against the cleaning wall and performs back and forth brushing.

8. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 6, characterized in that: In the construction step 2), the brushing portion has a diverging wall arranged away from the longitudinal wall, and an inclined triangular tube is provided on the diverging wall; the triangular tube is arranged with the same width as the brushing portion, and the bottom of the triangular tube is arranged flush with the bottom of the brushing portion; The inner side of the triangular tube is docked on the away wall, and the outer side of the triangular tube has an inclined plate, the upper end of the inclined plate is docked on the away wall, and along the direction of the brushing part from top to bottom, the lower end of the inclined plate is inclined away from the away wall.

9. The method for rotary drilling and wall brushing of a cross steel plate joint of an underground continuous wall according to claim 8, characterized in that: In the construction step 2), the brushing portion has a longitudinal cavity, which passes through the bottom of the brushing portion to form an inner bottom opening; the triangular tube has a triangular cavity, which passes through the bottom of the triangular tube to form an outer bottom opening; the longitudinal wall is provided with a plurality of directional openings, which pass through the longitudinal wall and are located between adjacent bristle bundles; In the construction step 3), when the wall brush moves downward in the straight groove section, the mud in the straight groove section enters the longitudinal cavity through the inner bottom opening, and impacts the cleaning wall and the brush bundle through multiple openings, so that the mud blocks on the brush bundle and the cleaning wall are separated.

10. The method for rotary drilling and wall brushing of cross steel plate joints of underground continuous wall according to claim 9, characterized in that: In the construction step 2), a plurality of elastic sheets arranged in a curved manner are provided in the longitudinal cavity, the elastic sheets being located above the opening; the inner ends of the elastic sheets are butted against the inner sidewalls of the longitudinal cavity, and the outer ends of the elastic sheets are bent and extended downward; the elastic sheets and the inner sidewalls of the longitudinal cavity enclose a guide area, and the opening is aligned and connected to the guide area; In the construction step 3), when the wall brush moves downward in the straight groove section, the mud in the straight groove section enters the longitudinal cavity through the inner bottom opening, and the mud flows to the guide area. The elastic sheet elastically deforms upward, synchronously driving the mud in the guide area to be accelerated and ejected toward the opening.

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