Construction method of diaphragm wall with I-beam joint and scraping method

Abstract

This invention relates to the technical field of cleaning H-beam joints, and discloses a scraper-type wall-brushing construction method for H-beam joints of diaphragm walls. The method includes the following steps: the diaphragm wall has a grouting section and an empty trench section, the empty trench section being located outside the grouting section. A reinforcing cage is installed in the grouting section, and an H-beam is connected to the end of the reinforcing cage. The H-beam has an outer wall facing the empty trench section. After the concrete in the grouting section reaches its initial setting time, the empty trench section is cleaned. One side of the wall-brushing device has a shovel sidewall, and the other side has a brush sidewall. Teeth are provided on the shovel sidewall, with the lower end of the teeth forming a pointed shovel end. A brush frame is provided on the brush sidewall, and multiple wire brushes are provided on the brush frame. The shovel end of the shovel is placed against the outer wall of the H-beam, and concrete blocks on the outer wall are removed using the shovel end. The wall-brushing device is rotated, and the wire brushes are placed against the outer wall. The wall-brushing device is moved up and down repeatedly, and concrete debris on the outer wall is removed using the wire brushes.

Description

Technical Field

[0001] This invention patent relates to the technical field of cleaning I-beam joints, and more specifically, to a scraping and brushing method for cleaning I-beam joints in diaphragm walls. Background Technology

[0002] When excavating trenches for diaphragm walls, to ensure the smooth lowering of the reinforcing cage with I-beam joints into the construction trench section, the grab bucket extends the trench section outwards by approximately 70cm at both ends during excavation, creating a pouring section and an empty section. Before pouring the wall concrete, sandbags are filled at the over-excavated I-beam joints on both sides, i.e., the empty section, to prevent seepage during concrete pouring in the pouring section. However, in actual construction, concrete inevitably seeps into the empty section and adheres to the I-beam joints. Therefore, during the construction of the empty section, the I-beam joints need to be pre-treated with a brushing process.

[0003] In existing technologies, the quality and efficiency of cleaning the I-beam joints of diaphragm walls directly affect the water-stopping effect and construction progress of the diaphragm wall. Common cleaning methods often employ impact-type cleaning, such as using a self-made wire brush on the side of an impact square drill bit or square hammer to brush away concrete adhering to the I-beam groove. A crane is used to hoist the brush and repeatedly flush the surface. However, when the wire brush encounters irregularly distributed concrete blocks, the suspended brush is prone to slipping along the layers. Furthermore, when encountering concrete of a certain strength, the brushing force is insufficient, resulting in poor cleaning effect and difficulty in controlling verticality. This leads to long cleaning times, low efficiency, and high overall construction costs. Summary of the Invention

[0004] The purpose of this invention is to provide a scraping and brushing construction method for I-beam joints of underground continuous walls, which aims to solve the problems of low brushing efficiency and poor brushing effect in the prior art.

[0005] This invention is implemented as follows: a scraping and brushing method for constructing diaphragm walls using I-beam joints, comprising the following construction steps:

[0006] 1) The diaphragm wall has a concrete pouring section and an empty trench section to be poured with concrete. The empty trench section is located outside the pouring section. A reinforcing cage is provided in the pouring section. The end of the reinforcing cage is connected to an I-beam. The I-beam has an outer wall facing the empty trench section and arranged along the height direction of the empty trench section.

[0007] After the concrete in the pouring section reaches its initial setting time, the empty trench section is cleaned until the bottom of the empty trench section reaches the elevation position.

[0008] 2) Provide a wall brush, wherein one side of the wall brush has a shovel sidewall and the other side of the wall brush has a brush sidewall; the shovel sidewall is provided with bucket teeth, the upper end of the bucket teeth is connected to the shovel sidewall, the lower end of the bucket teeth extends downward to form a pointed shovel end, and there is a wall gap between the bucket teeth and the shovel sidewall.

[0009] The brush sidewall is provided with a brush holder, which is laid along the plane of the brush sidewall. The brush holder is provided with multiple wire brushes, which are arranged to extend outward away from the brush sidewall.

[0010] 3) The shovel end of the bucket tooth abuts against the outer side wall of the I-beam, the wire brush is arranged away from the outer side wall, and the brush is moved from top to bottom to remove the concrete block on the outer side wall using the shovel end.

[0011] 4) Turn the wall brush device so that the wire brush is against the outer side wall, with the bucket teeth facing away from the outer side wall. Move the wall brush device up and down repeatedly to remove concrete debris from the outer side wall using the wire brush.

[0012] Optionally, repeat steps 3) and 4) until all concrete blocks and debris on the outer side wall are removed.

[0013] Optionally, in construction step 1), a rotary drilling rig is provided, which has a drill rod and a sand scoop. The sand scoop is used to excavate the soil in the empty trench section until the bottom of the empty trench section reaches the elevation position.

[0014] Optionally, in construction step 2), the drill rod is connected to the wall brush, and in construction steps 3) and 4), the drill rod is used to drive the wall brush to move up and down.

[0015] Optionally, the wall brush is in the shape of a square cylinder, and the wall brush has a square cylindrical connecting section with a connecting cavity in the connecting section; in construction step 2), the drill rod is inserted into the connecting cavity, and multiple connecting rods are inserted into the connecting section. The connecting rods pass through the connecting cavity and through the drill rod, and the drill rod and the connecting section are fixedly connected.

[0016] Optionally, in construction step 2), the shovel sidewall is provided with a plurality of bucket teeth, the plurality of bucket teeth are arranged along the width direction of the shovel sidewall, and there is a shovel interval between the shovel ends of adjacent bucket teeth;

[0017] In construction step 3), when multiple shovel ends abut against the outer wall and move from top to bottom to remove the concrete block on the outer wall, the concrete block forms the concrete debris located between the shovels and in the shape of strips. The concrete debris extends along the height direction of the outer wall.

[0018] Optionally, in construction step 2), a connecting strip is connected to the side wall of the shovel, the connecting strip extends along the width direction of the side wall of the shovel, and multiple bucket teeth are arranged along the length direction of the connecting strip; a connecting shaft is passed through the connecting strip, the upper end of the bucket teeth is hinged to the connecting shaft, and a torsion spring is provided on the connecting shaft, the torsion spring drives the shovel end of the bucket teeth to swing away from the side wall of the shovel and reset.

[0019] In construction step 3), when the shovel ends of the multiple bucket teeth abut against the outer side wall, the bucket teeth are pressed and swing toward the shovel side wall, reducing the wall spacing. When the shovel ends of the bucket teeth disengage from the shovel side wall, the torsion spring drives the shovel ends to swing away from the shovel side wall and reset.

[0020] Optionally, in construction step 2), the brush holder has a mounting wall, and there is a mounting interval between the mounting wall and the brush side wall. The mounting wall is provided with multiple mounting holes, and the two ends of the wire brush pass through two adjacent mounting holes respectively. The middle part of the wire brush is located in the mounting interval, forming a middle section, and the two ends of the wire brush extend to the outside of the mounting wall, forming brush wall ends.

[0021] In construction step 4), the brush end of the wire brush abuts against the outer wall, and the brush moves up and down to remove concrete debris from the outer wall.

[0022] Optionally, in construction step 2), a positioning plate is provided in the installation interval, and a positioning groove is provided on the positioning plate. The middle section is embedded in the positioning groove. Clamping blocks made of elastic material are provided on both sides of the positioning groove. The clamping blocks have clamping grooves. The two ends of the middle section are embedded in the clamping grooves and are elastically clamped by the clamping grooves.

[0023] The middle section is curved, and an elastic sleeve made of elastic material and curved is fitted around the outer periphery of the middle section. The elastic sleeve wraps around the outer periphery of the middle section, and the middle part of the elastic sleeve is embedded in the positioning groove.

[0024] In construction step 4), as the brush end of the wire brush moves up and down toward the outer wall, the middle section reciprocates and deforms. The clamping block and elastic sleeve reciprocate and deform synchronously with the middle section, limiting the opening and closing amplitude of the middle section.

[0025] Optionally, in construction step 2), a straight elastic band is connected between the brush ends of the plurality of wire brushes, and the elastic band is arranged obliquely along the height direction towards the outer wall; in construction step 4), when the plurality of brush ends brush up and down towards the outer wall, when the brush ends rub laterally along the width direction towards the outer wall, the elastic band elastically pulls the adjacent brush ends to rub laterally, so that the brush ends remove concrete debris laterally.

[0026] Compared with existing technologies, the scraping and brushing construction method for I-beam joints of underground continuous walls provided by this invention involves lowering the brushing device, placing the pointed end of the scraper against the outer wall, and then continuing to lower the brushing device. The teeth of the brushing device remove the concrete blocks, and the remaining material to be scraped on the outer wall forms concrete debris. By rotating the brushing device and using the wire brush on the brush frame to brush up and down, the concrete debris is removed, thus removing the concrete that has seeped into the I-beams in the empty trench section. In this way, the overall operation is simple, and the brushing efficiency and brushing effect are high. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the process for the scraping and brushing construction method of the I-beam joint of the underground continuous wall provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the injection section and the empty tank section provided by the present invention;

[0029] Figure 3 This is a three-dimensional schematic diagram of the I-beam provided by the present invention;

[0030] Figure 4 This is a three-dimensional schematic diagram of the wall brush provided by the present invention;

[0031] Figure 5 This is a top view schematic diagram of the wall brush provided by the present invention;

[0032] Figure 6 This is a front view schematic diagram of the wall brush provided by the present invention;

[0033] Figure 7 This is a cross-sectional schematic diagram of the installation interval provided by the present invention;

[0034] Figure 8 This is a front view schematic diagram of the mounting wall provided by the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative and not intended to limit the invention.

[0036] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0037] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention 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. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Reference Figure 1-8 The image shows a preferred embodiment of the present invention.

[0039] The method for constructing underground continuous wall diaphragm walls using a scraping and brushing technique with I-beam joints provided by this invention includes the following construction steps:

[0040] 1) The diaphragm wall has a concrete pouring section 100 and an empty trench section 200 to be poured with concrete. The empty trench section 200 is located outside the concrete pouring section 100. A reinforcing cage is provided in the concrete pouring section 100. The end of the reinforcing cage is connected to an I-beam 300. The I-beam 300 has an outer wall 310 facing the empty trench section 200 and arranged along the height direction of the empty trench section 200.

[0041] After the concrete in the pouring section 100 reaches its initial setting time, the empty trench section 200 is cleaned until the bottom of the empty trench section 200 reaches the elevation position.

[0042] 2) A wall brusher 400 is provided. One side of the wall brusher 400 has a shovel sidewall, and the other side of the wall brusher 400 has a brush sidewall. The shovel sidewall is provided with bucket teeth 420. The upper end of the bucket teeth 420 is connected to the shovel sidewall, and the lower end of the bucket teeth 420 extends downward to form a pointed shovel end. There is a wall gap between the bucket teeth 420 and the shovel sidewall.

[0043] A brush holder 430 is provided on the brush side wall. The brush holder 430 is laid along the plane of the brush side wall. Multiple wire brushes 431 are provided on the brush holder 430. The wire brushes 431 are arranged away from the brush side wall and extend outward.

[0044] 3) Place the shovel end of the bucket tooth 420 against the outer side wall 310 of the I-beam 300, and arrange the wire brush 431 away from the outer side wall 310. Move the brush 400 from top to bottom and use the shovel end to remove the concrete blocks on the outer side wall 310.

[0045] 4) Turn the wall brush 400 around, place the wire brush 431 against the outer side wall 310, with the bucket teeth facing away from the outer side wall 310, and move the wall brush 400 up and down repeatedly to remove concrete debris from the outer side wall 310 using the wire brush 431.

[0046] The above-mentioned construction method for scraping and brushing the joint of the 300-ton joint of the underground continuous wall involves lowering the brush 400, with the pointed end of the scraper abutting against the outer wall 310. The brush 400 is then lowered further, and the teeth 420 remove the concrete blocks. The remaining material to be scraped on the outer wall 310 forms concrete debris. By rotating the brush 400, the wire brush 431 on the brush holder 430 is used to brush up and down to remove the concrete debris. This method removes the concrete that has seeped into the vacant trench section 200 and onto the 300-ton joint of the diaphragm wall. The overall operation is simple, and the brushing efficiency and effect are good.

[0047] Specifically, the concrete layer formed on the outer side wall 310 initially has a high overall strength in a blocky shape. Therefore, it is first applied to the outer side wall 310 with a pointed shovel end, and then large pieces of concrete are removed downwards to break them down into concrete debris. This debris has low strength and is easy to wipe off, so it can be cleaned with a wire brush 431 that can wipe a large area.

[0048] Specifically, repeat steps 3) and 4) until all concrete blocks and debris on the outer side wall 310 are completely removed.

[0049] Specifically, in construction step 1), a rotary drilling rig is provided, which is equipped with a drill rod and a sand scoop. The sand scoop is used to excavate the soil in the empty trench section 200 until the bottom of the empty trench section 200 reaches the elevation position.

[0050] In construction step 2), the drill rod is connected to the wall brush 400. In construction steps 3) and 4), the drill rod is used to drive the wall brush 400 to move up and down. This significantly improves efficiency. By using the conversion connector interface, the next construction step can be completed quickly after excavation. Furthermore, due to the high rigidity of the rotary drilling rig's drill rod, the wall-brushing device 400, aided by the rotary drilling rig's strong wall-brushing force, can forcibly remove concrete blocks. The rotary drilling rig's drill rod lifting and lowering operations are quick, and the wall-brushing frequency is high. With the help of the rotary drilling rig, rapid wall-brushing can be performed. Using the traditional wall-brushing device 400, it takes an average of 12 hours per trench; using the new wall-brushing device 400, it only takes an average of 2 hours per trench, significantly improving efficiency. Moreover, by using a rotary drilling rig square sleeve connected to the rotary drilling rig's drill rod, the wall-brushing device 400 can be reused without the need for other equipment, saving on mechanical equipment investment costs for the project. At the same time, the high efficiency of the rotary drilling rig greatly reduces wall-brushing time, saving time costs for the project and lowering the overall cost of wall-brushing.

[0051] The wall brush 400 is a square cylindrical shape, and it has a square cylindrical connecting section 410 with a connecting cavity 411 inside. In construction step 2), the drill rod is inserted into the connecting cavity 411, and multiple connecting rods are inserted into the connecting section 410. The connecting rods pass through the connecting cavity 411 and the drill rod, thus fixing the drill rod to the connecting section 410. This allows for quick and convenient installation and disassembly, improving construction efficiency.

[0052] Specifically, in construction step 2), multiple bucket teeth 420 are provided on the side wall of the shovel. The multiple bucket teeth 420 are arranged along the width direction of the side wall of the shovel, and there is a material shoveling interval between the material shoveling ends of adjacent bucket teeth 420.

[0053] In construction step 3), when multiple shovel ends abut against the outer wall 310 and move from top to bottom, after removing the concrete blocks on the outer wall 310, the concrete blocks form strips of concrete debris located between the shovels. The concrete debris extends along the height of the outer wall 310. In this way, the strip-shaped concrete debris has low overall strength, making it easier to clean with a wire brush 431.

[0054] In construction step 2), a connecting strip 422 is connected to the side wall of the shovel. The connecting strip 422 extends along the width direction of the side wall of the shovel, and multiple bucket teeth 420 are arranged along the length direction of the connecting strip 422. A connecting shaft 423 is inserted through the connecting strip 422. The upper end of the bucket teeth 420 is hinged to the connecting shaft 423. A torsion spring is provided on the connecting shaft 423. The torsion spring drives the shovel end of the bucket teeth 420 to swing away from the side wall of the shovel and return to its original position.

[0055] In construction step 3), when the shovel ends of multiple bucket teeth 420 abut against the outer side wall 310, the bucket teeth 420 are pressed and swing towards the side wall, reducing the wall spacing. When the shovel ends of the bucket teeth 420 disengage from the side wall, the torsion spring drives the shovel ends to swing away from the side wall and return to their original position. In this way, by setting a torsion spring at the connecting shaft 423, when the bucket teeth 420 swing, the torsion spring deforms under force and generates elastic force, which can ensure that the shovel ends always have a certain pressure on the outer side wall 310, which is beneficial for removing concrete blocks.

[0056] In construction step 2), the brush holder 430 has a mounting wall 4300, and there is a mounting gap between the mounting wall 4300 and the brush side wall. The mounting wall 4300 is provided with multiple mounting holes. The two ends of the wire brush 431 pass through two adjacent mounting holes respectively. The middle part of the wire brush 431 is located in the mounting gap, forming a middle section. The two ends of the wire brush 431 extend to the outside of the mounting wall 4300 respectively, forming brush wall ends 432.

[0057] In construction step 4), the brush end 432 of the wire brush 431 abuts against the outer wall 310. As the brush 400 moves up and down, the brush end 432 removes concrete debris from the outer wall 310. In this way, the wire brush 431 is fixed to the mounting wall 4300.

[0058] In this embodiment, in construction step 2), a positioning plate 440 is provided in the installation interval, and a positioning groove 441 is provided on the positioning plate 440. The middle section is embedded in the positioning groove 441. Clamping blocks 442 made of elastic material are provided on both sides of the positioning groove 441. The clamping blocks 442 have clamping grooves, and the two ends of the middle section are embedded in the clamping grooves and are elastically clamped by the clamping grooves.

[0059] The middle section is curved, and an elastic sleeve 4310 made of elastic material and curved is fitted around the outer periphery of the middle section. The elastic sleeve 4310 wraps around the outer periphery of the middle section, and the middle part of the elastic sleeve 4310 is embedded in the positioning groove 441.

[0060] In construction step 4), as the brush end 432 of the wire brush 431 moves up and down towards the outer wall 310, the middle section reciprocates and deforms. The clamping block 442 and the elastic sleeve 4310 reciprocate and deform elastically with the middle section, limiting the opening and closing amplitude of the middle section. In this way, the middle section is elastically clamped in the positioning groove 441, preventing the wire brush 431 from detaching from the mounting wall 4300, while ensuring that the exposed brush ends 432 at both ends of the wire brush 431 are of equal length.

[0061] In construction step 2), a straight elastic band 433 connects the brush ends 432 of multiple wire brushes 431. The elastic band 433 is arranged obliquely along the height direction towards the outer wall 310. In construction step 4), as the multiple brush ends 432 brush up and down towards the outer wall 310, when the brush ends 432 rub laterally along the width direction towards the outer wall 310, the elastic band 433 elastically pulls the adjacent brush ends 432 to rub laterally, so that the brush ends 432 can remove concrete debris laterally. In this way, the elastic band 433 increases the connection between adjacent brush ends 432, so that when they rub laterally, they can drive the adjacent brush ends 432 to rub laterally, increasing the rubbing range and improving efficiency.

[0062] 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 within the protection scope of the present invention.

Claims

1. A method for constructing diaphragm walls using a scraping and brushing technique with I-beam joints, characterized in that: The construction steps include the following: 1) The diaphragm wall has a concrete pouring section and an empty trench section to be poured with concrete. The empty trench section is located outside the pouring section. A reinforcing cage is provided in the pouring section. The end of the reinforcing cage is connected to an I-beam. The I-beam has an outer wall facing the empty trench section and arranged along the height direction of the empty trench section. After the concrete in the pouring section reaches its initial setting time, the empty trench section is cleaned until the bottom of the empty trench section reaches the elevation position. 2) Provide a wall brush, wherein one side of the wall brush has a shovel sidewall and the other side of the wall brush has a brush sidewall; the shovel sidewall is provided with bucket teeth, the upper end of the bucket teeth is connected to the shovel sidewall, the lower end of the bucket teeth extends downward to form a pointed shovel end, and there is a wall gap between the bucket teeth and the shovel sidewall. The brush sidewall is provided with a brush holder, which is laid along the plane of the brush sidewall. The brush holder is provided with multiple wire brushes, which are arranged to extend outward away from the brush sidewall. 3) The shovel end of the bucket tooth abuts against the outer side wall of the I-beam, the wire brush is arranged away from the outer side wall, and the brush is moved from top to bottom to remove the concrete block on the outer side wall using the shovel end. 4) Turn the wall brush device so that the wire brush is against the outer side wall, with the bucket teeth facing away from the outer side wall. Move the wall brush device up and down repeatedly to remove concrete debris from the outer side wall using the wire brush. In construction step 2), the brush holder has a mounting wall, and there is a mounting interval between the mounting wall and the brush side wall. The mounting wall is provided with multiple mounting holes, and the two ends of the wire brush pass through two adjacent mounting holes respectively. The middle part of the wire brush is located in the mounting interval, forming a middle section, and the two ends of the wire brush extend to the outside of the mounting wall, forming brush wall ends. In construction step 4), the brush end of the wire brush abuts against the outer wall, and the brush brush moves up and down to remove concrete debris from the outer wall. In construction step 2), a straight elastic band is connected between the brush ends of the multiple wire brushes, and the elastic band is arranged obliquely along the height direction towards the outer wall; in construction step 4), when the multiple brush ends brush up and down towards the outer wall, when the brush ends rub laterally along the width direction towards the outer wall, the elastic band elastically pulls the adjacent brush ends to rub laterally, so that the brush ends remove concrete debris laterally.

2. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint, as described in claim 1, is characterized in that... Repeat construction steps 3) and 4) until all concrete blocks and debris on the outer side wall are completely removed.

3. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint, as described in claim 1, is characterized in that... In construction step 1), a rotary drilling rig is provided, which has a drill rod and a sand scoop. The sand scoop is used to excavate the soil in the empty trench section until the bottom of the empty trench section reaches the elevation position.

4. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint as described in claim 3, characterized in that... In construction step 2), the drill rod is connected to the wall brush. In construction steps 3) and 4), the drill rod is used to drive the wall brush to move up and down.

5. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint, as described in claim 3, is characterized in that... The wall brush is in the shape of a square cylinder, and the wall brush has a square cylindrical connecting section with a connecting cavity in the connecting section; in construction step 2), the drill rod is inserted into the connecting cavity, and multiple connecting rods are inserted into the connecting section. The connecting rods pass through the connecting cavity and through the drill rod, and the drill rod and the connecting section are fixedly connected.

6. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint as described in claim 1, characterized in that... In construction step 2), the shovel sidewall is provided with multiple bucket teeth, which are arranged along the width direction of the shovel sidewall, and there is a material-shoveling interval between the material-shoveling ends of adjacent bucket teeth. In construction step 3), when multiple shovel ends abut against the outer wall and move from top to bottom to remove the concrete block on the outer wall, the concrete block forms the concrete debris located between the shovels and in the shape of strips. The concrete debris extends along the height direction of the outer wall.

7. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint, as described in claim 1, is characterized in that... In construction step 2), a connecting strip is connected to the side wall of the shovel. The connecting strip extends along the width direction of the side wall of the shovel, and multiple bucket teeth are arranged along the length direction of the connecting strip. A connecting shaft is passed through the connecting strip. The upper end of the bucket teeth is hinged to the connecting shaft. A torsion spring is provided on the connecting shaft. The torsion spring drives the shovel end of the bucket teeth to swing away from the side wall of the shovel and reset. In construction step 3), when the shovel ends of the multiple bucket teeth abut against the outer side wall, the bucket teeth are pressed and swing toward the shovel side wall, reducing the wall spacing. When the shovel ends of the bucket teeth disengage from the shovel side wall, the torsion spring drives the shovel ends to swing away from the shovel side wall and reset.

8. The method for constructing a continuous underground wall using a scraping and brushing technique with an I-beam joint, as described in any one of claims 1 to 7, is characterized in that... In construction step 2), a positioning plate is provided in the installation interval, and a positioning groove is provided on the positioning plate. The middle section is embedded in the positioning groove. Clamping blocks made of elastic material are provided on both sides of the positioning groove. The clamping blocks have clamping grooves. The two ends of the middle section are embedded in the clamping grooves and are elastically clamped by the clamping grooves. The middle section is curved, and an elastic sleeve made of elastic material and curved is fitted around the outer periphery of the middle section. The elastic sleeve wraps around the outer periphery of the middle section, and the middle part of the elastic sleeve is embedded in the positioning groove. In construction step 4), as the brush end of the wire brush moves up and down toward the outer wall, the middle section reciprocates and deforms. The clamping block and elastic sleeve reciprocate and deform synchronously with the middle section, limiting the opening and closing amplitude of the middle section.

Images