Improved underground continuous wall rigid joint and construction method thereof

Abstract

This application relates to the field of foundation pit engineering technology, and in particular to an improved rigid joint for diaphragm walls and its construction method. The joint includes a molded plate and a circular pile. The outer arc surface of the molded plate and the outer arc surface of the circular pile are fixedly connected along the axis of symmetry. The radius of the molded plate is larger than the radius of the circular pile, and the width of the molded plate is designed to match the width of the diaphragm wall trench section. This application improves the flow of concrete around the joint.

Description

Technical Field

[0001] This application relates to the field of foundation pit engineering technology, and in particular to an improved rigid joint for diaphragm walls and its construction method. Background Technology

[0002] Construction joints in diaphragm walls refer to the connection joints between different sections of the diaphragm wall. Based on their stress characteristics, they can generally be divided into flexible joints and rigid joints. Construction joints that can withstand bending moment, shear force, and tension are called rigid joints, while joints that cannot withstand bending moment, shear force, and tension are called flexible joints.

[0003] With the increasing complexity of foundation pit construction conditions and underground main structure stress conditions, conventional flexible joints cannot meet the complex bending, shear and tension stress conditions and strict anti-seepage requirements of diaphragm wall joints. Rigid joints for diaphragm walls, represented by cross-shaped steel plate joints, have been widely used in engineering projects, and the technology is relatively mature.

[0004] Regarding the aforementioned technologies, the inventors believe that even if the traditional cross-shaped steel plate joint has longitudinal perforations, due to structural limitations, the interlocking effect between the concrete and the steel plate at the perforation location sometimes cannot meet the stress and impermeability requirements of the diaphragm wall joint. In particular, when the joints of different diaphragm wall sections are subjected to horizontal tension, vertical gaps often occur due to insufficient longitudinal interlocking effect at the joint, causing concrete to flow around during pouring and affecting the normal use of the structure. Summary of the Invention

[0005] To improve the problem of concrete bypass at the joint connection, this application provides an improved rigid joint for diaphragm walls and its construction method.

[0006] This application provides an improved rigid joint for diaphragm walls and its construction method, which adopts the following technical solution:

[0007] In a first aspect, an improved rigid joint for diaphragm walls includes a profile plate and a circular pile. The outer arc surface of the profile plate is fixedly connected to the outer arc surface of the circular pile along the axis of symmetry. The radius of the profile plate is larger than the radius of the circular pile, and the width of the profile plate is used to match the width of the diaphragm wall trench.

[0008] By adopting the above technical solution, the combination of the slab and the circular pile can, firstly, support the concrete through the structure of the slab when pouring the diaphragm wall on one side of the slab, as the concrete structure supports the concrete. Moreover, the greater the pressure of the concrete on the slab, the tighter the fit between the slab and the diaphragm wall segment, which helps to improve the problem of concrete bypass at the joint. Furthermore, the circular pile, when pouring the concrete on the side of the circular pile, can improve the connection stability of the diaphragm wall through the fit between the circular pile and the slab, thereby improving the overall connection stability of the diaphragm wall segment.

[0009] Optionally, the inner arc side of the profile is detachably provided with multiple support members, and the multiple support members are arranged in a manner along the length direction of the inner arc side of the profile.

[0010] By adopting the above technical solution, the support components can support the template, thereby adjusting and shaping the inner arc side of the template. Through adjustment, the template and the diaphragm wall section can be interference-fitted, improving the sealing performance between the template and the diaphragm wall.

[0011] Optionally, the support member is a telescopic rod, which includes a fixed sub-rod and an adjusting sub-rod. One end of the fixed sub-rod is provided with a sliding groove, and the adjusting sub-rod is slidably disposed in the sliding groove. The side wall of the fixed sub-rod is provided with a threaded hole through the sliding groove, and the side wall of the fixed sub-rod is provided with a locking bolt. The locking bolt is threadedly engaged with the threaded hole, and the locking bolt is used to lock the adjusting sub-rod.

[0012] By adopting the above technical solution, during installation, the length between the fixed sub-rod and the adjusting sub-rod is adjusted, and then the locking bolt is tightened to lock and fix the adjusting sub-rod, thereby realizing the supporting function of the telescopic rod on the template.

[0013] Optionally, the inner arc side of the template has two positioning grooves corresponding to the telescopic rod, and the two positioning grooves are respectively used to engage with the ends of the fixed sub-rod and the adjusting sub-rod.

[0014] By adopting the above technical solution, the telescopic pole can be positioned during installation, thereby improving the stability of the installation.

[0015] Optionally, the top of the circular pile has a through hole extending through the bottom, and a filler column is inserted into the through hole to support the circular pile.

[0016] By adopting the above technical solution, the setting of infill columns can support the round piles when pouring the underground continuous wall, and the infill columns can be disassembled when the pouring is completed, so that the infill columns can be reused repeatedly, reducing the material used for round piles and saving construction costs.

[0017] Optionally, a connecting groove is provided on the side of the outer wall of the circular pile away from the template, through the through hole, and multiple connecting grooves are provided, which are arranged at equal intervals along the length of the circular pile.

[0018] By adopting the above technical solution, the setting of the connecting groove can increase the overall thickness of the connection end of the gap structure between the outer side of the round pile and the round pile, as well as between the round pile and the molded plate, during the concrete pouring process. This is beneficial to improving the connection stability of the overall structure and thus improving the overall structural strength.

[0019] Optionally, the top surface of the filling column is provided with a drainage groove, and the side wall of the filling column is provided with drainage holes through the drainage groove. Multiple drainage holes are provided, and the multiple drainage holes are arranged at equal intervals along the length direction of the filling column.

[0020] By adopting the above technical solution, the concrete can be filtered and impurities removed during the pouring process through drainage channels and drainage holes, thereby removing impurities mixed on the concrete surface during the pouring process and improving the overall quality of the diaphragm wall.

[0021] Optionally, the drainage channel is filled with a sponge layer.

[0022] By adopting the above technical solution, the concrete is cured by watering the sponge layer during the concrete solidification process, thereby further improving the overall quality of the diaphragm wall.

[0023] Optionally, a lifting ring is fixedly installed on the top surface of the filling column.

[0024] By adopting the above technical solution, the filling column can be easily hoisted during disassembly.

[0025] Secondly, an improved construction method for rigid joints in diaphragm walls includes the following steps:

[0026] S1. Measure the width of the underground continuous wall trench section in advance before construction;

[0027] S2. Install the telescopic rod on the inner side of the template, and adjust the length of the telescopic rod so that the length of the telescopic rod is greater than the width of the underground continuous wall trench section to support the template;

[0028] S3. Once the template is finalized, remove the telescopic rod and install the template.

[0029] S4. Pour concrete into the inner arc side of the slab to construct a diaphragm wall.

[0030] S5. Pour concrete onto the outer arc side of the slab to construct the second underground continuous wall.

[0031] S6. Regularly water the sponge layer;

[0032] S7. Remove the filling column using the lifting ring;

[0033] S8. Pour concrete into the through hole to construct the connecting wall section.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The combination of slab and round pile can firstly support the concrete by cooperating with the diaphragm wall section. When pouring the diaphragm wall on the slab side, the slab structure supports the concrete. The greater the pressure of the concrete on the slab, the tighter the fit between the slab and the diaphragm wall section, which helps to improve the problem of concrete bypass at the joint. The round pile can improve the connection stability of the diaphragm wall by cooperating with the slab when pouring the concrete on the pile side, which in turn helps to improve the connection stability of the overall structure of the diaphragm wall section.

[0036] 2. The support components can support the template, thereby adjusting and shaping the inner arc side of the template. Through adjustment, the template can be made to fit the diaphragm wall section with an interference fit, improving the sealing performance between the template and the diaphragm wall.

[0037] 3. The infill columns can support the round piles during the pouring of the underground continuous wall, and can be dismantled when the wall is set, thus allowing the infill columns to be reused, reducing the amount of material used for the round piles and saving construction costs. Attached Figure Description

[0038] Figure 1 This is a top view of an improved rigid joint for diaphragm walls in an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the internal structure of an improved rigid joint for underground continuous walls in an embodiment of this application.

[0040] Figure 3 This is a side view of a circular pile of an improved rigid joint for a diaphragm wall in an embodiment of this application.

[0041] Figure 4This is a top view of the structure after the construction of an improved rigid joint for a diaphragm wall in an embodiment of this application is completed.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Diaphragm wall section; 2. Circular pile; 3. Diaphragm wall section; 31. Diaphragm wall section 1; 32. Diaphragm wall section 2; 33. Connecting wall section; 4. Infill column; 5. Lifting ring; 6. Connecting groove; 7. Drainage groove; 8. Drainage hole; 9. Sponge layer; 10. Telescopic rod; 101. Fixed sub-rod; 102. Adjusting sub-rod; 103. Locking bolt; 11. Positioning groove. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0045] Firstly, this application discloses an improved rigid joint for diaphragm walls. (Refer to...) Figure 1 and Figure 2 An improved rigid joint for diaphragm walls includes a molded plate 1 and a circular pile 2. The outer arc surface of the molded plate 1 and the outer arc surface of the circular pile 2 are fixedly connected along the axis of symmetry. The width of the molded plate 1 matches the width of the diaphragm wall trench 3. This allows the molded plate 1 and the circular pile 2 to be installed within the diaphragm wall trench 3 as a connecting joint. The radius of the circular pile 2 is smaller than the radius of the molded plate 1, which facilitates the flow of concrete closer to the circular pile 2 into the gap between the circular pile 2 and the diaphragm wall trench 3 during diaphragm wall pouring, filling the gap. This enhances the connection stability between the circular pile 2 and the diaphragm wall during solidification.

[0046] Reference Figure 1 and Figure 2 The top of the circular pile 2 has a through hole extending to the bottom, and a filling column 4 is inserted into the through hole. The filling column 4 supports the circular pile 2 during the pouring of the diaphragm wall and can be disassembled during the final shaping, allowing for repeated use of the filling column 4, reducing the material consumption of the circular pile 2 and saving construction costs. A lifting ring 5 is fixedly installed on the top of the filling column 4, facilitating its hoisting during disassembly.

[0047] Reference Figure 2 and Figure 3A connecting groove 6 is provided in the through hole on the outer side of the circular pile 2 away from the molded plate 1, and multiple connecting grooves 6 are provided, which are arranged at equal intervals along the length of the circular pile 2. The setting of the connecting groove 6 can increase the overall thickness of the connection end of the gap structure between the outer side of the circular pile 2 and the circular pile 2, as well as between the circular pile 2 and the molded plate 1, during the concrete pouring process, thereby improving the connection stability of the overall structure and thus improving the overall structural strength.

[0048] Reference Figure 2 The top surface of the infill column 4 is provided with a drainage groove 7, and the side wall of the infill column 4 is provided with drainage holes 8 through the drainage groove 7. In this embodiment, multiple drainage holes 8 are provided, and the multiple drainage holes 8 are arranged at equal intervals along the length direction of the infill column 4, and the drainage holes 8 are aligned with the connecting groove 6. A sponge layer 9 is filled in the drainage groove 7, and the sponge layer 9 extends into the multiple drainage holes 8. During construction, the drainage groove 7, drainage holes 8 and sponge layer 9 are combined to filter water and remove impurities from the concrete during pouring, thereby filtering out impurities mixed on the concrete surface during the pouring process. At the same time, the sponge layer 9 can be watered during the concrete setting process to cure the concrete and improve the overall quality of the diaphragm wall.

[0049] Reference Figure 1 Multiple support members are detachably provided on the inner arc side of the mold plate 1, and these support members are arranged along the length direction of the inner arc side of the mold plate 1. In this embodiment, the support member is a telescopic rod 10, and the telescopic rod 10 includes a fixed sub-rod 101 and an adjusting sub-rod 102. One end of the fixed sub-rod 101 is provided with a sliding groove, and the adjusting sub-rod 102 is slidably disposed in the sliding groove. The side wall of the fixed sub-rod 101 is provided with a threaded hole penetrating the interior of the sliding groove, and a locking bolt 103 is provided on the side wall of the fixed sub-rod 101, and the locking bolt 103 is threadedly engaged with the threaded hole. During installation, the telescopic rod 10 is first placed into the inner arc side of the mold plate 1, and the length of the telescopic rod 10 is adjusted so that the fixed sub-rod 101 and the adjusting sub-rod 102 cooperate to support the mold plate 1, and the radius of the inner arc side of the mold plate 1 is supported to be larger than the width of the underground continuous wall trench section 3. Then, the adjusting sub-rod 102 is fixed by the locking bolt 103. This allows for an interference fit between the template 1 and the diaphragm wall section 3 during installation, improving the stability of the connection between the template 1 and the diaphragm wall section 3.

[0050] Reference Figure 1The inner arc side of the template 1 has two positioning grooves 11 for multiple telescopic rods 10. The two positioning grooves 11 are respectively inserted into the ends of the fixed sub-rod 101 and the adjusting sub-rod 102, so that the telescopic rods 10 can be positioned when they are installed. At the same time, after disassembly, when concrete is poured into the inner side of the template 1, the concrete flows into the positioning grooves 11 to form a raised structure, which cooperates with the positioning grooves 11 to improve the stability of the connection between the underground continuous wall and the template 1.

[0051] The implementation principle of an improved rigid joint for diaphragm walls in this application embodiment is as follows:

[0052] During installation, the joint is installed inside the diaphragm wall section 3 to achieve a fit between the mold plate 1 and the diaphragm wall section 3. When pouring the diaphragm wall on one side of the mold plate 1, the structure of the mold plate 1 supports the concrete. The greater the pressure of the concrete on the mold plate 1, the tighter the fit between the mold plate 1 and the diaphragm wall section 3. This helps to improve the problem of concrete bypass at the joint connection. The setting of the circular pile 2, when pouring the concrete on one side of the circular pile 2, can improve the connection stability of the diaphragm wall through the fit between the circular pile 2 and the mold plate 1, thereby improving the connection stability of the overall structure of the diaphragm wall section 3. Afterwards, the infill column 4 is dismantled, and the inside of the through hole is poured, thus realizing the overall installation of the diaphragm wall.

[0053] Secondly, this application also discloses a construction method for an improved rigid joint for diaphragm walls, referring to... Figure 4 This includes the following steps:

[0054] S1. Measure the width of the underground continuous wall section 3 in advance before construction;

[0055] S2. Install the telescopic rod 10 on the inner side of the mold plate 1, and adjust the length of the telescopic rod 10 so that its length is greater than the width of the underground continuous wall section 3 to support the mold plate 1. This makes the radius of the mold plate 1 greater than the width of the underground continuous wall section 3, thereby achieving an interference fit between the mold plate 1 and the underground continuous wall section 3 and improving the sealing performance of the installation between the mold plate 1 and the underground continuous wall section 3.

[0056] S3. When the mold plate 1 is finalized, remove the telescopic rod 10 and install the mold plate 1;

[0057] S4. Pour concrete on the inner arc side of the slab 1 to build the underground continuous wall 31.

[0058] S5. Pour concrete on the outer arc side of the slab 1 to build the underground continuous wall 32.

[0059] S6. Regularly water the sponge layer 9. This will help maintain the diaphragm wall 2 32 and improve its overall quality.

[0060] S7. Remove the filling column 4 using the lifting ring 5;

[0061] S8. Pour concrete into the through hole, building connecting wall section 33.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An improved rigid joint for diaphragm walls, characterized in that: Includes a profile plate (1) and a circular pile (2). The outer arc surface of the profile plate (1) and the outer arc surface of the circular pile (2) are fixedly connected along the axis of symmetry. The radius of the profile plate (1) is greater than the radius of the circular pile (2), and the width of the profile plate (1) is used to match the width of the underground continuous wall trench section (3). The inner arc side of the template (1) is detachably provided with multiple support members, and the multiple support members are arranged in a row along the length direction of the inner arc side of the template (1). The support member is a telescopic rod (10), which includes a fixed sub-rod (101) and an adjusting sub-rod (102). One end of the fixed sub-rod (101) is provided with a sliding groove, and the adjusting sub-rod (102) is slidably disposed in the sliding groove. The side wall of the fixed sub-rod (101) is provided with a threaded hole through the sliding groove, and the side wall of the fixed sub-rod (101) is provided with a locking bolt (103). The locking bolt (103) is threadedly engaged with the threaded hole, and the locking bolt (103) is used to lock the adjusting sub-rod (102). The inner arc side of the template (1) is provided with two positioning grooves (11) corresponding to the telescopic rod (10). The two positioning grooves (11) are respectively used to insert and cooperate with the ends of the fixed sub-rod (101) and the adjusting sub-rod (102). The top of the round pile (2) is provided with a through hole extending through the bottom, and a filling column (4) is inserted into the through hole to support the round pile (2). A connecting groove (6) is provided on the side of the outer wall of the round pile (2) away from the mold plate (1) through the through hole, and multiple connecting grooves (6) are provided, and the multiple connecting grooves (6) are arranged at equal intervals along the length direction of the round pile (2). The top surface of the filling column (4) is provided with a drainage groove (7), and the side wall of the filling column (4) is provided with a drainage hole (8) through the drainage groove (7). There are multiple drainage holes (8), and the multiple drainage holes (8) are arranged at equal intervals along the length direction of the filling column (4). The drainage channel (7) is filled with a sponge layer (9).

2. The improved rigid joint for diaphragm walls according to claim 1, characterized in that: A lifting ring (5) is fixedly installed on the top surface of the filling column (4).

3. A construction method for an improved rigid joint for diaphragm walls, applied to the improved rigid joint for diaphragm walls described in claim 2, characterized in that, Includes the following steps: S1. Measure the width of the underground continuous wall trench (3) in advance before construction; S2. Install the telescopic rod (10) on the inner side of the template (1), and adjust the length of the telescopic rod (10) so that the length of the telescopic rod (10) is greater than the width of the underground continuous wall trench (3) to support the template (1); S3. When the template (1) is finalized, remove the telescopic rod (10) and install the template (1); S4. Pour concrete into the inner arc side of the slab (1) to build a diaphragm wall (31). S5. Pour concrete into the outer arc side of the slab (1) to build the underground continuous wall (32); S6. Regularly water the sponge layer (9); S7. Remove the filling column (4) using the lifting ring (5); S8. Pour concrete into the through hole to build the connecting wall section (33).

Images