Seam water stop structure of underground diaphragm wall and secant pile

Abstract

The utility model discloses a joint water stop structure of an underground diaphragm wall and a secant pile. The joint water stop structure comprises the underground diaphragm wall, the secant pile and a water stop connector. The secant piles comprise a plurality of plain concrete piles and a plurality of reinforced concrete piles, one reinforced concrete pile is secant between any two adjacent plain concrete piles, and one plain concrete pile is secant between any two adjacent reinforced concrete piles; the water stop connector comprises a web plate and two transverse plates, the web plate is arranged between the underground diaphragm wall and the secant pile, the two transverse plates are arranged at the two ends of the web plate respectively, the web plate divides a gap between the two transverse plates into a first water stop space and a second water stop space, one end of the underground diaphragm wall is located in the first water stop space and bonded with the web plate and the two transverse plates, and the other end of the underground diaphragm wall is located in the second water stop space. The second water stopping space is filled with the connecting piles, and the web and the two transverse plates are bonded. According to the technical scheme, the joint water stop structure of the underground diaphragm wall and the secant pile can improve the water stop performance of the joint between the underground diaphragm wall and the secant pile.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a joint water-stopping structure for underground continuous walls and interlocking piles. Background Technology

[0002] Diaphragm walls are a common support structure in foundation pit engineering. Using trenching machinery and with slurry wall support, a narrow, deep trench is excavated along the perimeter of the deep excavation project. A reinforcing cage is then suspended inside the trench, and finally, underwater concrete is poured using the tremie method to form a reinforced concrete wall unit. This process is repeated segment by segment until a continuous reinforced concrete wall is formed.

[0003] Interlocking cast-in-place piles are a type of pile where adjacent concrete piles are partially interlocked circumferentially, often simply called interlocking piles. The piles are typically arranged with alternating plain concrete piles and reinforced concrete piles. During construction, the plain concrete piles are installed first, followed by the reinforced concrete piles. During construction, the reinforced concrete piles are partially cut into the plain concrete piles, causing the adjacent piles to interlock and form a continuous wall structure, serving to retain soil and prevent water seepage.

[0004] In reality, some projects require diaphragm walls as the primary foundation pit support structure due to high environmental protection requirements, deep excavation depths, and stringent water-stopping requirements. In other areas, where clearance constraints preclude diaphragm walls, interlocking piles—which offer higher rigidity, better water-stopping performance, easier construction, and lower cost—are used as local support structures. In these cases, the interface between the diaphragm wall and the interlocking piles becomes a weak point, easily forming seepage channels. Utility Model Content

[0005] The main purpose of this utility model is to propose a joint sealing structure for diaphragm walls and interlocking piles, which aims to improve the water-stopping performance of the joint between diaphragm walls and interlocking piles.

[0006] To achieve the above objectives, the present invention proposes a joint sealing structure for diaphragm walls and interlocking piles, comprising:

[0007] The underground continuous wall has a steel cage inside, and the inside and outside of the steel cage are filled with concrete.

[0008] Interlocking piles, comprising multiple plain concrete piles and multiple reinforced concrete piles, wherein a reinforced concrete pile interlocks between any two adjacent plain concrete piles, and a plain concrete pile interlocks between any two adjacent reinforced concrete piles, wherein one of the plain concrete piles is a connecting pile and is located near the end of the diaphragm wall of the interlocking piles; and

[0009] A water-stopping joint includes a web and two transverse plates. The web is located between the diaphragm wall and the interlocking pile. The two transverse plates are located at both ends of the web. The web divides the gap between the two transverse plates into a first water-stopping space and a second water-stopping space. One end of the diaphragm wall is located in the first water-stopping space and is bonded to the web and the two transverse plates. The connecting pile at least partially fills the second water-stopping space and is bonded to the web and the two transverse plates.

[0010] Optionally, the material of the water-stop joint is metal.

[0011] Optionally, the reinforcing cage in the diaphragm wall is welded and fixed to the two horizontal plates.

[0012] Optionally, the plain concrete pile is made of ultra-slow-setting concrete.

[0013] Optionally, the extension direction of both transverse plates is perpendicular to the web plate, and the web plate and the two transverse plates are an integral structure.

[0014] Optionally, the length of the two transverse plates toward the interlocking pile portion is greater than the length of the two transverse plates toward the diaphragm wall portion.

[0015] Optionally, the joint sealing structure for the underground continuous wall and interlocking piles proposed in this utility model is as follows:

[0016] Step 1: Drill holes to form the foundation pit for the underground continuous wall.

[0017] Step 2: Hoist the diaphragm wall reinforcement cage and the waterstop joint welded to the diaphragm wall reinforcement cage into the trench.

[0018] Step 3: Use C35 underwater concrete to pour the reinforcement cage of the underground continuous wall and the first water-stop space.

[0019] Step 4: Drill holes to form the connecting pile holes. During the drilling process, keep the holes filled with mud at all times.

[0020] Step 5: After the hole is formed, use a wall brushing tool to brush the web and transverse plates of the second water-stop space to remove the remaining soil and the concrete flowing around the underground continuous wall, and clean and replace the slurry in the hole.

[0021] Step 6: Pour ultra-slow-setting concrete to form a connecting pile that fills the second water-stop space.

[0022] Step 7: Drill a hole to form a plain concrete pile hole adjacent to the previously formed plain concrete pile. During the drilling process, keep the hole full of mud. After drilling is completed, clean the hole and replace the mud, and pour super slow-setting concrete to form a plain concrete pile adjacent to the plain concrete pile poured in the previous step.

[0023] Step 8: Before the two plain concrete piles poured in the above steps have fully solidified, a hole is formed between them using a full casing, and part of the connecting pile and plain concrete pile is cut to form a reinforced concrete pile hole. After cleaning the hole and replacing the slurry, a steel cage is lowered and solidified concrete is poured to form a reinforced concrete pile that simultaneously interlocks with the two plain concrete piles.

[0024] Step 9: Repeat steps 7 to 8 to interlock and arrange multiple plain concrete piles and multiple reinforced concrete piles in sequence to form a complete interlocking pile structure.

[0025] This utility model's technical solution involves setting a water-stop joint between a diaphragm wall and interlocking piles. The interlocking piles include multiple sequentially interlocking plain concrete piles and reinforced concrete piles. One plain concrete pile at the end of the interlocking piles is designated as a connecting pile. The water-stop joint includes a web and two transverse plates. The web is located between the diaphragm wall and the interlocking piles, and the two transverse plates are located at opposite ends of the web. The web divides the gap between the two transverse plates into a first water-stop space and a second water-stop space. One end of the diaphragm wall is located within the first water-stop space, and the connecting pile is at least partially located within the second water-stop space. In this way, the two transverse plates enclose both sides of the connection between the diaphragm wall and the interlocking piles, and the web encloses the space between the diaphragm wall and the interlocking piles. Both the diaphragm wall and the connecting piles are bonded to the water-stop joint, which enhances the shear strength at the joint between the diaphragm wall and the interlocking piles and prevents liquid from seeping between them, thus improving the water-stopping effect at the joint between the diaphragm wall and the interlocking piles.

[0026] Moreover, compared to simply setting up a reinforcing structure on the side of the joint between the diaphragm wall and the interlocking piles to improve the water-stopping performance, this water-stopping structure is simpler, occupies less space, and has a simpler construction process. In addition, setting a water-stopping joint to bond the diaphragm wall and the interlocking piles can improve the shear strength at the joint between the diaphragm wall and the interlocking piles. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic plan view of an embodiment of the joint water-stopping structure of the underground continuous wall and interlocking piles of this utility model.

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 for Figure 1 A schematic diagram of the water stop connector.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0032] Explanation of reference numerals: 10. Diaphragm wall; 11. Diaphragm wall reinforcement cage; 20. Interlocking pile; 21. Plain concrete pile; 22. Reinforced concrete pile; 33. First water-stop space; 34. Second water-stop space; 30. Water-stop joint; 31. Web; 32. Horizontal plate Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a joint sealing structure for underground continuous walls and interlocking piles.

[0037] In the embodiments of this utility model, such as Figure 1 and Figure 2As shown, the connection structure of the diaphragm wall 10 and the interlocking piles 20 includes the diaphragm wall 10, the interlocking piles 20, and the water-stop joint 30; the interior of the diaphragm wall 10 is a steel cage, and concrete is poured inside and outside the steel cage; the interlocking piles 20 include multiple plain concrete piles 21 and multiple reinforced concrete piles 22, with one reinforced concrete pile 22 interlocking between any two adjacent plain concrete piles 21, and one plain concrete pile 21 interlocking between any two adjacent reinforced concrete piles 22, one of which is a connecting pile and is located in the interlocking joint. The pile 20 is close to the end of the diaphragm wall 10; the water-stop joint 30 includes a web 31 and two transverse plates 32. The web 31 is located between the diaphragm wall 10 and the interlocking pile 20. The two transverse plates 32 are located at both ends of the web 31. The web 31 divides the gap between the two transverse plates 32 into a first water-stop space 33 and a second water-stop space 34. One end of the diaphragm wall 10 is located in the first water-stop space 33 and is bonded to the web 31 and the two transverse plates 32. The connecting pile at least partially fills the second water-stop space 34 and is bonded to the web 31 and the two transverse plates 32.

[0038] Specifically, a first water-stopping space 33 and a second water-stopping space 34 are formed at the water-stopping joint 30. The first water-stopping space 33 accommodates the end of the diaphragm wall 10, and the plain concrete pile 21 at the end of the interlocking pile 20 is adapted to the second water-stopping space 34. The two horizontal plates 32 can effectively prevent groundwater from seeping into the space between the diaphragm wall 10 and the interlocking pile 20. Moreover, the web plate 31 is combined with the diaphragm wall 10 and the plain concrete pile 21 to form a second water-stopping defense line. Even if groundwater seeps into the gap between the horizontal plate 32 and the plain interlocking pile 20, or into the gap between the horizontal plate 32 and the diaphragm wall 10, it cannot pass through the second water-stopping defense line.

[0039] This utility model's technical solution involves setting a water-stopping joint 30 between the diaphragm wall 10 and the interlocking piles 20. The interlocking piles 20 include multiple sequentially interlocking plain concrete piles 21 and reinforced concrete piles 22. One plain concrete pile 21 located at the end of the interlocking piles 20 is designated as a connecting pile. The water-stopping joint 30 includes a web 31 and two transverse plates 32. The web 31 is located between the diaphragm wall 10 and the interlocking piles 20. The two transverse plates 32 are located at opposite ends of the web 31, dividing the gap between the two transverse plates 32 into a first water-stopping space 33 and a second water-stopping space 34. One end of the diaphragm wall 10 is located within the first water-stopping space 33, and the connecting pile is at least partially located within the second water-stopping space 34. In this way, two horizontal plates 32 are closed on both sides of the connection between the diaphragm wall 10 and the interlocking pile 20, and the web plate 31 is closed between the diaphragm wall 10 and the interlocking pile 20. The diaphragm wall 10 and the connecting pile are both bonded to the water-stopping joint 30, which enhances the shear strength of the joint between the diaphragm wall 10 and the interlocking pile 20, and prevents liquid from seeping between the diaphragm wall 10 and the interlocking pile 20, thereby improving the water-stopping effect at the joint between the diaphragm wall 10 and the interlocking pile 20.

[0040] Moreover, compared to simply setting a reinforcing structure on the side of the joint between the diaphragm wall 10 and the interlocking pile 20 to improve the water-stopping performance, this water-stopping structure is simpler, occupies less space, and has a simpler construction process. In addition, setting a water-stopping joint 30 to bond the diaphragm wall 10 and the interlocking pile 20 can improve the shear strength at the joint between the diaphragm wall 10 and the interlocking pile 20.

[0041] In some embodiments, the water-stop joint 30 is made of metal. Specifically, when the water-stop joint 30 is made of metal, the bonding effect between the water-stop joint 30 and the concrete of the diaphragm wall 10, and between the water-stop joint 30 and the interlocking pile 20, is better, thereby further improving the water-stopping effect between the diaphragm wall 10 and the interlocking pile 20. This also results in higher strength for the water-stop joint 30, making it less prone to deformation and able to withstand more forces transmitted between the diaphragm wall 10 and the interlocking pile 20, thus making the connection between the diaphragm wall 10 and the interlocking pile 20 more stable and reliable. Alternatively, in other embodiments, the material of the water-stop joint 30 can be replaced with glass fiber reinforced concrete.

[0042] In some embodiments, the reinforcing cage within the diaphragm wall 10 is welded and fixed to two horizontal plates 32. Specifically, this welding and fixing of the reinforcing cage and the two horizontal plates 32 results in a higher connection strength between the diaphragm wall 10 and the water-stop joint 30, and better sealing performance. It also facilitates the installation of the reinforcing cage and the water-stop joint 30 together in the foundation pit. Furthermore, when pouring concrete to form the diaphragm wall 10, the concrete is poured into the first water-stop space 33, thereby bonding the diaphragm wall 10 to the water-stop joint 30. Alternatively, in other embodiments, the diaphragm wall 10, the reinforcing cage, and the water-stop joint 30 can be directly bonded and fixed.

[0043] In some embodiments, the plain concrete pile 21 is cast from ultra-slow-setting concrete. Specifically, compared to ordinary concrete materials, ultra-slow-setting concrete allows the plain concrete pile 21 to set more slowly. The ultra-slow-setting concrete can be poured evenly into the pile hole without causing quality problems due to excessively rapid setting. Moreover, when drilling to form the reinforced concrete pile 22 hole that interlocks with the plain concrete pile 21, it is easier to cut the unset plain concrete pile 21.

[0044] In some embodiments, the extension directions of the two transverse plates 32 are both perpendicular to the web plate 31, and the web plate 31 and the two transverse plates 32 are an integral structure. Specifically, such a water-stop joint 30 is an I-beam structure. The water-stop joint 30 has good structural strength, and such I-beam structures are readily available on the market, eliminating the need for customization and saving costs.

[0045] In some embodiments, the length of the two horizontal plates 32 toward the interlocking pile 20 is greater than the length of the two horizontal plates 32 toward the diaphragm wall 10. Specifically, this results in a larger second water-stopping space 34 and a larger bonding area between the horizontal plates 32 and the connecting pile, leading to a better water-stopping effect.

[0046] In some embodiments, the construction method of this utility model is as follows:

[0047] Step 1: Drill holes to form the foundation pit for the underground continuous wall.

[0048] Step 2: Hoist the underground continuous wall reinforcement cage and the water-stop joint 30 welded to the underground continuous wall reinforcement cage into the trench.

[0049] Step 3: Use C35 underwater concrete to pour the reinforcement cage of the underground continuous wall and the first water-stop space 33.

[0050] Step 4: Drill holes to form the connecting pile holes. During the drilling process, keep the holes filled with mud at all times.

[0051] The drilling mud can form a mud cake inside the borehole wall, and at the same time, the drilling mud can exert pressure on the borehole wall to prevent the borehole wall from collapsing and ensure the smooth progress of the drilling work.

[0052] Step 5: After the hole is formed, use a wall brushing tool to brush the web 31 and transverse plate 32 of the second water-stopping space 34 to remove the remaining soil and the concrete flowing around the underground continuous wall 10, and clean the hole and replace the slurry.

[0053] Brushing the web 31 and the transverse plate 32 can remove the soil, gravel and other debris attached to the web 31 and the transverse plate 32, so as to facilitate better bonding of concrete to the web 31 and the transverse plate 32, thereby improving the water-stopping effect of the joint between the diaphragm wall 10 and the interlocking pile 20.

[0054] Step 6: Pour ultra-slow-setting concrete to form a connecting pile that fills the second water-stop space 34.

[0055] Pouring ultra-slow-setting concrete allows the connecting piles to set more slowly, and compared to ordinary concrete, ultra-slow-setting concrete has higher strength after it has fully set.

[0056] Step 7: Drill a hole to form a plain concrete pile 21 adjacent to the previously formed plain concrete pile 21. During the drilling process, keep the hole full of mud. After the drilling is completed, clean the hole and replace the mud, and pour super slow-setting concrete to form a plain concrete pile 21 adjacent to the plain concrete pile 21 poured in the previous step.

[0057] Step 8: Before the two plain concrete piles 21 poured in the above steps have fully solidified, a hole is formed between them using a full casing wall, and part of the connecting pile and plain concrete pile 21 is cut to form a reinforced concrete pile 22 hole. After cleaning the hole and replacing the grout, a steel cage is lowered and solidified concrete is poured to form a reinforced concrete pile 22 that simultaneously interlocks with the two plain concrete piles.

[0058] Step 9: Repeat steps 7 to 8 to interlock and arrange multiple plain concrete piles and multiple reinforced concrete piles in sequence to form a complete interlocking pile 20 structure.

[0059] In addition, the thickness, width, dimensions of the interlocking piles 20, dimensions of the web 31, and dimensions of the transverse plate 32 of the diaphragm wall 10 in this embodiment can all be determined according to the specific engineering geological conditions.

[0060] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A joint sealing structure for a diaphragm wall and interlocking piles, characterized in that, include: A diaphragm wall has a steel cage inside, and concrete is poured inside and outside the steel cage to form a complete diaphragm wall structure. Interlocking piles, comprising multiple plain concrete piles and multiple reinforced concrete piles, wherein a reinforced concrete pile interlocks between any two adjacent plain concrete piles, and a plain concrete pile interlocks between any two adjacent reinforced concrete piles, wherein one of the plain concrete piles is a connecting pile and is located at the end of the interlocking piles near the diaphragm wall; and The water-stopping joint includes a web and two transverse plates. The web is located between the diaphragm wall and the interlocking pile. The two transverse plates are located at both ends of the web. The web divides the gap between the two transverse plates into a first water-stopping space and a second water-stopping space. One end of the diaphragm wall is located in the first water-stopping space and is bonded to the web and the two transverse plates. The connecting pile at least partially fills the second water-stopping space and is bonded to the web and the two transverse plates.

2. The joint sealing structure of the diaphragm wall and interlocking piles as described in claim 1, characterized in that, The material of the water-stop joint is metal.

3. The joint sealing structure of the diaphragm wall and interlocking piles as described in claim 2, characterized in that, The steel cage inside the diaphragm wall is welded and fixed to the two horizontal plates.

4. The joint sealing structure of the diaphragm wall and interlocking piles as described in claim 1, characterized in that, The plain concrete piles are made of ultra-slow-setting concrete.

5. The joint sealing structure of the underground continuous wall and interlocking piles as described in claim 1, characterized in that, The two transverse plates extend perpendicularly to the web plate, and the web plate and the two transverse plates are an integral structure.

6. The joint sealing structure of the diaphragm wall and interlocking piles as described in claim 1, characterized in that, The length of the two horizontal plates toward the interlocking pile portion is greater than the length of the two horizontal plates toward the underground continuous wall portion.

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