An auxiliary construction structure for a diaphragm wall and a construction method

Abstract

This invention relates to an auxiliary construction structure and method for diaphragm walls, comprising: a connecting steel plate separating a pre-constructed diaphragm wall section from a subsequent diaphragm wall section; the connecting steel plate includes sealing plates on both sides, and a joint pipe is provided between the outer side of the sealing plate and the wall surface of the pre-constructed diaphragm wall section; the outer arc surface of the joint pipe is in contact with the outer side of the sealing plate, and the outer arc surface of the joint pipe is also in contact with the wall surface of the pre-constructed diaphragm wall section. During construction, the reinforcing cage of the pre-constructed diaphragm wall section and the connecting steel plate are first hoisted into the pre-constructed diaphragm wall section, and then the joint pipe is hoisted between the outer side of the connecting steel plate and the wall surface of the pre-constructed diaphragm wall section. This overcomes the defects of poor joint stability and poor anti-leakage effect in the prior art.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to an auxiliary construction structure and construction method for diaphragm walls. Background Technology

[0002] Among various retaining structures, diaphragm walls are one of the most effective methods for foundation pit support and are widely used in underground engineering. However, the construction process of diaphragm walls is very complex, and during construction, there are indispensable construction joints between adjacent trench segments.

[0003] During the application of joints in engineering, the flow of concrete can easily cause the joints to deform or shift in position, which can further lead to concrete leakage. Existing joint structures usually use anti-leakage iron sheets or curtains for leakage prevention, but the leakage prevention effect is poor and they cannot support or protect the joint. Therefore, it is worthwhile to study the improvement of existing joints. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor joint stability and poor anti-leakage effect in the prior art, thereby providing an auxiliary construction structure and construction method for underground continuous wall.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An auxiliary construction structure for diaphragm walls includes: a connecting steel plate separating a pre-constructed diaphragm wall section from a post-constructed diaphragm wall section; the connecting steel plate includes sealing plates on both sides, and a joint pipe is provided between the outer side of the sealing plate and the wall surface of the pre-constructed diaphragm wall section; the outer arc surface of the joint pipe is in contact with the outer side of the sealing plate, and the outer arc surface of the joint pipe is also in contact with the wall surface of the pre-constructed diaphragm wall section.

[0007] Preferably, the joining steel plate further includes a partition plate; the sealing plate includes a long plate and a short plate; one end of the long plate is rigidly connected to the partition plate, and the other end faces the first constructed continuous wall section; one end of the short plate is rigidly connected to the partition plate, and the other end faces the second constructed continuous wall section.

[0008] Preferably, it further includes at least one connecting steel plate, which is rigidly connected to the joining steel plate; a support plate is connected to one end of the connecting steel plate facing the subsequent continuous wall trench section, and a detachable joint baffle is provided on one side of the support plate, and the support plate is in contact with the joint baffle; side steel plates are fixed on both sides of the joint baffle, and the outer side of the side steel plates is in close contact with the trench wall surface of the first continuous wall trench section.

[0009] Preferably, the connecting steel plate includes a first steel plate and a second steel plate; one end of the first steel plate is rigidly connected to the joining steel plate, and the other end faces the first constructed continuous wall trench section; one end of the second steel plate is rigidly connected to the joining steel plate, and the other end faces the subsequent constructed continuous wall trench section; the second steel plate is fixedly connected to the support plate.

[0010] A method for constructing a diaphragm wall, comprising the following steps: utilizing the aforementioned auxiliary construction structure.

[0011] Construction preparation steps, including the dimensional design of the continuous wall and auxiliary construction structures, and the fabrication of the auxiliary construction structures;

[0012] The construction steps for the first continuous wall trench section include hoisting the connecting steel plate to one end of the first continuous wall trench section, and then hoisting the joint pipe between the outer side of the sealing plate and the trench wall surface of the first continuous wall trench section, so that the joint pipe fits the outer side of the sealing plate and the trench wall surface of the first continuous wall trench section, thereby isolating the end of the first continuous wall trench section and preventing slurry from overflowing when pouring cement.

[0013] The subsequent construction steps for the continuous wall trench section include, among other things, removing the joint pipe.

[0014] Preferably, the construction step of constructing the continuous wall trench segment first includes a step of supporting the connecting steel plate with connecting steel plate, support plate and joint baffle, wherein the two sides of the joint baffle are attached to the trench wall surface of the continuous wall trench segment constructed first through side steel plates.

[0015] Preferably, the supporting step includes rigidly connecting the joining steel plate, the connecting steel plate, and the supporting plate into a rigid joint.

[0016] Preferably, the post-construction continuous wall trench section includes excavating the post-construction continuous wall trench section and then removing the joint baffle.

[0017] Preferably, the auxiliary construction structure fabrication step includes: fabricating a pre-constructed continuous wall trench section reinforcement cage and a post-constructed continuous wall trench section reinforcement cage, wherein the post-constructed continuous wall trench section reinforcement cage is bent inward to form a protruding end joint; the protruding end joint is located near one end of the pre-constructed continuous wall trench section reinforcement cage.

[0018] Preferably, the steps of fabricating the reinforcing cages for the first and subsequent continuous wall sections include bending the bottom ends of the longitudinal reinforcing bars of both sections inward.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The above-mentioned technical solution provides an auxiliary construction structure and construction method for underground continuous wall. First, by using the joint steel plate and the joint pipe in cooperation, the first construction continuous wall section and the second construction continuous wall section are separated. This can prevent the concrete flowing in the first construction continuous wall section from flowing out during the process of pouring concrete into the second construction continuous wall section, thus affecting the construction of the second construction continuous wall section.

[0021] Secondly, the joint pipe is attached to the joint steel plate and the trench wall of the first continuous wall section. The interaction force between the joint pipe and the joint steel plate allows the joint steel plate to push the joint pipe to squeeze the soil on the trench wall, resulting in better leakage prevention. The joint pipe is set on both sides of the joint steel plate, which also has a reaction force on the joint steel plate, thus maintaining the stability of the joint steel plate and preventing the joint steel plate from deforming due to the flow of concrete.

[0022] Finally, since the connecting steel plate is ultimately embedded in the diaphragm wall for reinforcement during construction, and the joint pipe is eventually disassembled and filled with concrete, the method of using the connecting steel plate and the joint pipe to form a partition allows for prioritizing the increase of the length of the connecting steel plate when constructing diaphragm walls of different widths, thereby reducing the diameter of the joint pipe. This makes the connection surface of the diaphragm wall smoother and also reduces the contact area between the joint pipe and the concrete, which is beneficial for the removal of the joint pipe and reduces the segmentation of the concrete pouring of the diaphragm wall, thus making the application scope of this invention wider. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a top view schematic diagram of the rigid joint of the underground continuous wall according to the present invention.

[0025] Figure 2 This is a schematic diagram showing the state after concrete has been poured into the continuous wall trench section in accordance with the present invention.

[0026] Figure 3 This is a schematic diagram showing the state of the steel reinforcement cage of the continuous wall section after the installation of the steel reinforcement cage in the subsequent construction of the present invention.

[0027] Figure 4 This is a schematic diagram showing the state of the continuous wall and rigid joint after the completion of construction according to the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Construct the continuous wall trench section first; 10. Construct the continuous wall trench section reinforcement cage first; 2. Construct the continuous wall trench section later; 20. Construct the continuous wall trench section reinforcement cage later; 201. Protruding end joint; 3. Connecting steel plate; 31. Sealing plate; 311. Long plate; 312. Short plate; 32. Separator plate; 4. Joint pipe; 5. Connecting steel plate; 51. First steel plate; 52. Second steel plate; 6. Support plate; 7. Joint baffle; 8. Side steel plate. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figure 1As shown, this embodiment of the invention provides an auxiliary construction structure for a diaphragm wall, including: a connecting steel plate 3 separating a pre-constructed diaphragm wall section 1 from a post-constructed diaphragm wall section 2; the connecting steel plate 3 includes sealing plates 31 disposed on both sides, and a joint pipe 4 is provided between the outer side of the sealing plate 31 and the wall surface of the pre-constructed diaphragm wall section 1; in order for the connecting steel plate 3 and the joint pipe 4 to cooperate to separate the pre-constructed diaphragm wall section 1 from the post-constructed diaphragm wall section 2, so that during the pouring of concrete into the pre-constructed diaphragm wall section 1, the connecting steel plate 3 and the joint pipe 4 can prevent the concrete flowing inside the pre-constructed diaphragm wall section 1 from flowing out and affecting the construction of the post-constructed diaphragm wall section 2, the outer arc surface of the joint pipe 4 and the outer side of the sealing plate 31 are connected. The outer arc surface of the joint pipe 4 is also in contact with the wall surface of the first-constructed continuous wall section 1. That is, the length of the connecting steel plate 3 and the diameter of the joint pipe 4 are set according to the width of the first-constructed continuous wall section 1 and the second-constructed continuous wall section 2, so that the connecting steel plate 3 can initially separate the first-constructed continuous wall section 1 and the second-constructed continuous wall section 2 from the middle, while the joint pipes 4 on both sides can squeeze the soil on the wall surface of the trench, realizing the complete separation of the first-constructed continuous wall section 1 and the second-constructed continuous wall section 2. In order to increase the leak-proof effect of the joint pipe 4 and facilitate the disassembly of the joint pipe 4, the joint pipe 4 can be set as an elastic pipe, and a smooth metal arc plate can be set on the joint pipe 4 facing the first-constructed continuous wall section 1 (i.e. the side in contact with the concrete).

[0034] In practical applications, it is well known that the anti-seepage pipe structure is dismantled during the construction of continuous walls. When the diameter of the anti-seepage pipe structure is large, more concrete will come into contact with its outer surface, making subsequent dismantling more difficult and requiring more concrete to be filled, which can easily lead to significant divisions in the continuous wall. In this invention, the connecting steel plate 3 and the joint pipe 4 are used to form a partition. During construction, the connecting steel plate 3 is eventually embedded in concrete to reinforce the wall, and the joint pipe 4 is eventually removed and then filled with concrete. Therefore, when constructing continuous walls of different widths, the length of the connecting steel plate 3 can be increased first, thereby reducing the diameter of the joint pipe 4. This is more conducive to the removal of the joint pipe 4 and reduces the segmentation of the concrete poured in the continuous wall, making the application range of this invention wider.

[0035] Specifically, the connecting steel plate 3 also includes a partition plate 32. The installation direction of the partition plate 32 can be perpendicular to or at a certain angle to the construction direction of the continuous wall. The distance between the two ends of the partition plate 32 and the wall surface of the first continuous wall section 1 is set according to the diameter of the joint pipe 4 and the thickness of the sealing plate 31. To prevent the joint pipe 4 from detaching from the sealing plate 31 due to the thrust of the flowing concrete, and to prevent the joint pipe 4 from getting stuck, the sealing plate 31 includes a long plate 311. One end of the long plate 311 is rigidly connected to the partition plate 32, and the other end faces the first constructed continuous wall section 1. This increases the running distance of the joint pipe 4 on the long plate 311, preventing the joint pipe 4 from detaching from the sealing plate 31 and affecting the seepage prevention effect. This design also allows the joint pipe 4 to be moved horizontally along the direction of the long plate 311 before being lifted out, making disassembly simpler. To increase the strength of the connecting steel plate 3 connecting the two continuous wall sections without affecting the construction of the subsequent continuous wall section 2, the sealing plate 31 also includes a short plate 312. One end of the short plate 312 is rigidly connected to the partition plate 32, and the other end faces the subsequent constructed continuous wall section 2.

[0036] Specifically, the rigid joint of the underground continuous wall of the present invention also includes a connecting steel plate 5, which is rigidly connected to the connecting steel plate 3; the connecting steel plate 5 can be set as one piece and rigidly connected to the middle section of the connecting partition plate 32 (that is, the partition plate 32 and the connecting steel plate 5 are in a cross connection state), and the connecting steel plate 5 can also be arranged in 2 to 5 pieces along the length direction of the partition plate 32.

[0037] Furthermore, in order to increase the connection strength between the two continuous walls, the connecting steel plate 5 includes a first steel plate 51 and a second steel plate 52; one end of the first steel plate 51 is rigidly connected to the connecting steel plate 3, and the other end faces the first-constructed continuous wall section 1; one end of the second steel plate 52 is rigidly connected to the connecting steel plate 3, and the other end faces the second-constructed continuous wall section 2. During the pouring process, the first steel plate 51 is embedded in the first-constructed continuous wall, and the second steel plate 52 is embedded in the second-constructed continuous wall, so as to achieve a stable connection between the two continuous walls.

[0038] In practical applications, since continuous wall segment 1 is constructed first and continuous wall segment 2 is constructed later, to prevent deformation or displacement of the connecting steel plate 3 and the connecting steel plate 5 due to the flow of concrete during the pouring of continuous wall segment 1, a support plate 6 is fixedly connected to one end of the second steel plate 52 of the connecting steel plate 5. A detachable joint baffle 7 is provided on one side of the support plate 6, and the support plate 6 and the joint baffle 7 are in close contact. The joint baffle 7 is used to support the rigid connection of the support plate 6, the connecting steel plate 5, and the connecting steel plate 3. This design allows the joint baffle 7 to protect the rigid connection between the support plate 6, the connecting steel plate 5, and the joining steel plate 3, preventing damage to the rigid connection between the support plate 6, the connecting steel plate 5, and the joining steel plate 3 during the construction of the continuous wall section 2 after excavation. To further enhance the support effect of the joint baffle 7, side steel plates 8 are fixed on both sides of the joint baffle 7. The outer side of the side steel plate 8 is pressed against the wall of the first continuous wall section 1, and the friction and support force of the side steel plate 8 are increased by the contact between the side of the side steel plate 8 and the soil of the wall.

[0039] This invention also provides a method for auxiliary construction using the above-mentioned auxiliary construction structure, comprising the following construction steps:

[0040] I. Construction Preparation Steps:

[0041] This includes the dimensional design of continuous walls and auxiliary construction structures, as well as the fabrication of auxiliary construction structures.

[0042] Specifically, the dimensional design steps for the diaphragm wall and auxiliary construction structures include: designing the dimensions of the reinforcement cage 10 for the first diaphragm wall section, the reinforcement cage 20 for the second diaphragm wall section, the connecting steel plate 3, the joint pipe 4, the connecting steel plate 5, the support plate 6, the joint baffle 7, and the side steel plate 8 based on the width and depth of the diaphragm wall, and drawing construction drawings, and carrying out construction according to the drawings during the construction process.

[0043] The steps for fabricating the auxiliary construction structure include: fabricating the first continuous wall trench section reinforcement cage 10, the second continuous wall trench section reinforcement cage 20, the connecting steel plate 3, the joint pipe 4, the connecting steel plate 5, the support plate 6, the joint baffle 7, and the side steel plate 8.

[0044] In the process of fabricating the reinforcing cage 10 for the first section of the continuous wall and the reinforcing cage 20 for the second section of the continuous wall, the design can be based on the reinforcement drawing of the underground continuous wall and the division of unit sections. Different fabrication methods can be selected. Either the reinforcing cage 10 for the first section and the reinforcing cage 20 for the second section of the continuous wall can be fabricated directly as a single unit section, or they can be fabricated in sections first and then connected segment by segment during hoisting. During the segment-by-segment connection, welding with binding strips can be used. However, to avoid the need for hoisting the reinforcing cage 10 for the first section of the continuous wall and the second section of the second section of the continuous wall... When constructing the continuous wall trench section reinforcement cage 20, the trench wall surfaces of the first constructed continuous wall trench section 1 and the second constructed continuous wall trench section 2 are scratched. The bottom ends of the longitudinal reinforcement bars of the first constructed continuous wall trench section reinforcement cage 10 and the second constructed continuous wall trench section reinforcement cage 20 are bent inward. In addition, one end of the second constructed continuous wall trench section reinforcement cage 20 can be bent inward to form a protruding end joint 201. The protruding end joint 201 is set near the end of the first constructed continuous wall trench section reinforcement cage 10 to facilitate the connection between the second constructed continuous wall trench section reinforcement cage 20 and the first constructed continuous wall trench section reinforcement cage 10.

[0045] During the fabrication of the joining steel plate 3, joint pipe 4, connecting steel plate 5, and support plate 6, they can be fabricated separately, or they can be rigidly connected to the pre-constructed continuous wall trench section reinforcement cage 10 as a whole. In this process, the first steel plate 51 and the second steel plate 52 of the connecting steel plate 5 can be fixedly installed on both sides of the joining steel plate 3 by welding, pin connection, screw connection, or other fixing methods. Then, the support plate 6 can be fixedly installed on one end of the second steel plate 52 by welding, pin connection, screw connection, or other fixing methods.

[0046] Follow the steps outlined above to complete the preparatory work before construction.

[0047] II. Construction steps for the first section of the continuous wall trench:

[0048] This includes first constructing a guide wall, then using mud slurry to protect the wall and separate the mud slurry from the surrounding soil, thereby ensuring that the foundation pit does not collapse during construction.

[0049] This includes using excavation equipment (excavation) or drilling equipment (drilling) to process the first trench, excavating the first continuous wall section 1 through the first trench, and cleaning the trench wall surface of the first continuous wall section 1.

[0050] This includes hoisting the prefabricated continuous wall section reinforcement cage 10, connecting steel plate 3, joint pipe 4, connecting steel plate 5, and support plate 6 into the prefabricated continuous wall section 1. The above structures can be hoisted into the prefabricated continuous wall section 1 one by one and fixedly connected within the prefabricated continuous wall section 1. The connection method can be welding, screw connection, or pin connection, which helps to reduce the weight of hoisting and makes the hoisting process more flexible. This is suitable for cases with large structural dimensions. Alternatively, the above structures can be fixedly connected first and then hoisted into the prefabricated continuous wall section 1 as a whole. This is beneficial for fixing the above structures and saves hoisting steps, making it suitable for cases with smaller structural dimensions.

[0051] This includes hoisting the connector pipe 4 between the outer side of the sealing plate 31 and the wall surface of the first-constructed continuous wall section 1, so that the connector pipe 4 fits against the outer side of the sealing plate 31 and the wall surface of the first-constructed continuous wall section 1, separating the end of the first-constructed continuous wall section 1 and preventing slurry from overflowing when pouring cement.

[0052] The process includes supporting the connecting steel plate 3 using the connecting steel plate 5, the supporting plate 6, and the joint baffle 7. The two sides of the joint baffle 7 are attached to the wall surface of the first constructed continuous wall section 1 through the side steel plates 8. The connecting steel plate 3, the connecting steel plate 5, and the supporting plate 6 can be rigidly connected to form a rigid joint J.

[0053] This includes first constructing the continuous wall section 1 by pouring concrete, such as... Figure 2 As shown, during the pouring process, the joint pipe 4 is used to prevent leakage, and the joint baffle 7 and the side steel plate 8 form an integral support rigid joint J (a rigid structure composed of the joining steel plate 3, connecting steel plate 5, and support plate 6).

[0054] Follow the steps described above to complete the construction of the first continuous wall section 1.

[0055] III. Construction steps for the post-construction continuous wall section 2:

[0056] This includes using excavation equipment (excavation) or drilling equipment (drilling) to process a second trench, excavating a continuous wall section 2 through the second trench, and cleaning the wall surface of the continuous wall section 2.

[0057] After the concrete in the continuous wall section 1 to be constructed has solidified, the joint pipe 4 is removed, and the joint baffle 7 and side steel plate 8 are disassembled as a whole. The simultaneous hoisting of the joint pipe 4 and the joint baffle 7 and side steel plate 8 as a whole can save hoisting steps. The joint pipe 4 can also be disassembled after the reinforcement cage 20 of the subsequent continuous wall section is hoisted, which increases the time for the joint pipe 4 to be disconnected. This allows the joint pipe 4 to still play a positioning role for the rigid joint J when the reinforcement cage 20 of the subsequent continuous wall section is hoisted.

[0058] This includes hoisting the subsequent continuous wall section reinforcement cage 20 into the subsequent continuous wall section 2 and fixing the subsequent continuous wall section reinforcement cage 20 to the first continuous wall section reinforcement cage 10. During this process, the protruding end joint 201 is set near one end of the first continuous wall section reinforcement cage 10 and rigidly connected to one end of the first continuous wall section reinforcement cage 10. Specifically, the longitudinal reinforcement of the first continuous wall section reinforcement cage 10 can be connected to the longitudinal reinforcement of the protruding end joint 201, or the protruding end joint 201 can be welded to the first continuous wall section reinforcement cage 10.

[0059] This includes pouring concrete within section 2 of the continuous wall construction, such as... Figure 4 As shown, after pouring, the connecting steel plate 3, connecting steel plate 5, and supporting plate 6 are connected to form a rigid joint J, which is embedded in the concrete with the steel reinforcement cage 10 of the first continuous wall section and the steel reinforcement cage 20 of the second continuous wall section, to reinforce the continuous wall.

[0060] Following the steps outlined above, construct section 2 of the continuous wall trench after completion.

[0061] The above steps can be repeated to complete the construction of multiple sections of continuous wall. In addition, during the construction of the continuous wall, concrete is poured (concrete is poured into the continuous wall trench section 1 first and then into the continuous wall trench section 2). During the concrete pouring process, the lower guide pipe of the pouring pipe is always embedded in the concrete; the lower guide pipe is not less than 1.5m above the ground and not more than 9m above the ground, so that the concrete will not stagnate in the pouring pipe when it is introduced, and also so that the steel cage 10 of the continuous wall trench section constructed first and the steel cage 20 of the continuous wall trench section constructed later will not float up during pouring. In addition, during the pouring process, the height of the continuous wall is higher than the design depth of the continuous wall, specifically exceeding the depth by 300-500mm, to ensure that the concrete strength below the design elevation meets the design requirements after the laitance is removed.

[0062] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An auxiliary construction structure for diaphragm walls, characterized in that, include: The connecting steel plate (3) separates the first continuous wall trench segment (1) and the second continuous wall trench segment (2); The connector tube (4) is detachably installed on both sides of the connecting steel plate (3); The joining steel plate (3) includes sealing plates (31) disposed on both sides, and the joint pipe (4) is disposed between the outer side of the sealing plate (31) and the wall surface of the first constructed continuous wall section (1). The outer arc surface of the connector pipe (4) is in contact with the outer side of the sealing plate (31), and the outer arc surface of the connector pipe (4) is also in contact with the wall surface of the first constructed continuous wall trench section (1). The joint pipe (4) is dismantled after the concrete in the first-construction continuous wall trench section (1) has solidified, or the joint pipe (4) is dismantled after the reinforcement cage (20) of the subsequent construction continuous wall trench section (2) is hoisted. The joint pipe (4) is configured as an elastic pipe, and a smooth metal disc is provided on the side of the joint pipe (4) facing the first constructed continuous wall trench section (1). The joining steel plate (3) also includes a partition plate (32); The sealing plate (31) includes a long plate (311) and a short plate (312). One end of the long plate (311) is rigidly connected to the partition plate (32), and the other end faces the first constructed continuous wall trench section (1). One end of the short plate (312) is rigidly connected to the partition plate (32), and the other end faces the subsequent continuous wall trench section (2). It also includes at least one connecting steel plate (5), which is rigidly connected to the joining steel plate (3); The connecting steel plate (5) is connected to a support plate (6) at one end facing the post-construction continuous wall trench section (2). A detachable joint baffle (7) is provided on one side of the support plate (6), and the support plate (6) is in contact with the joint baffle (7). Side steel plates (8) are fixed on both sides of the joint baffle (7), and the outer side of the side steel plate (8) is attached to the wall surface of the first constructed continuous wall section (1).

2. The auxiliary construction structure for diaphragm walls according to claim 1, characterized in that, The connecting steel plate (5) includes a first steel plate (51) and a second steel plate (52); One end of the first steel plate (51) is rigidly connected to the connecting steel plate (3), and the other end faces the first constructed continuous wall trench section (1). One end of the second steel plate (52) is rigidly connected to the connecting steel plate (3), and the other end faces the subsequent continuous wall trench section (2). The second steel plate (52) is fixedly connected to the support plate (6).

3. A method for constructing a diaphragm wall, characterized in that, The construction steps include a method for auxiliary construction using the diaphragm wall auxiliary construction structure as described in claim 1 or 2, comprising the following construction steps: Construction preparation steps, including the dimensional design of the continuous wall and auxiliary construction structures, and the fabrication of the auxiliary construction structures; The construction steps of the first continuous wall trench section (1) include hoisting the connecting steel plate (3) to one end of the first continuous wall trench section (1), and then hoisting the joint pipe (4) between the outer side of the sealing plate (31) and the trench wall surface of the first continuous wall trench section (1), so that the joint pipe (4) fits the outer side of the sealing plate (31) and the trench wall surface of the first continuous wall trench section (1), and isolates the end of the first continuous wall trench section (1) to prevent the mud from overflowing when pouring cement; The construction steps of the continuous wall trench section (2) include the removal of the joint pipe (4).

4. A method for constructing a diaphragm wall according to claim 3, characterized in that, The construction steps of the first continuous wall trench section (1) include the step of supporting the connecting steel plate (3) with the connecting steel plate (5), the supporting plate (6) and the joint baffle (7), wherein the two sides of the joint baffle (7) are attached to the trench wall surface of the first continuous wall trench section (1) through the side steel plate (8).

5. A method for constructing a diaphragm wall according to claim 4, characterized in that, The supporting step includes rigidly connecting the joining steel plate (3), the connecting steel plate (5), and the supporting plate (6) into a rigid joint (J).

6. A method for constructing a diaphragm wall according to claim 4, characterized in that, The post-construction continuous wall trench section (2) includes the excavation of the post-construction continuous wall trench section (2) and the removal of the joint baffle (7).

7. A method for constructing a diaphragm wall according to claim 3, characterized in that, The auxiliary construction structure fabrication steps include: fabricating a pre-construction continuous wall trench section reinforcement cage (10) and a post-construction continuous wall trench section reinforcement cage (20), wherein the post-construction continuous wall trench section reinforcement cage (20) is bent inward at one end to form a protruding end joint (201); the protruding end joint (201) is located near one end of the pre-construction continuous wall trench section reinforcement cage (10).

8. A method for constructing a diaphragm wall according to claim 7, characterized in that, In the steps of making the first-construction continuous wall trench section reinforcement cage (10) and the second-construction continuous wall trench section reinforcement cage (20), the bottom ends of the longitudinal reinforcement bars of the first-construction continuous wall trench section reinforcement cage (10) and the second-construction continuous wall trench section reinforcement cage (20) are bent inward.

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