Water sealing structure of underground diaphragm wall joint pipe pre-buried freezing pipe

Abstract

The utility model discloses a water sealing structure of an underground diaphragm wall joint pipe embedded freezing pipe. The water sealing structure comprises an underground diaphragm wall, a groove section reinforcement cage, a joint pipe and a joint pipe reinforcement cage. The joint pipe is mounted at a seam of the underground diaphragm wall; the groove section reinforcement cage is arranged in a continuous wall groove section in the underground continuous wall; the joint pipe reinforcement cage is arranged in the joint pipe; the connector pipe reinforcement cage is of a cylindrical structure with a cavity in the middle, and the diameter of the connector pipe reinforcement cage is smaller than that of the connector pipe. The joint pipe reinforcement cage comprises transverse ribs and longitudinal freezing pipes, and the transverse ribs and the freezing pipes are connected to form a net-shaped structure. Under the condition that the original strength of the component is not affected, the gap can be frozen, the freezing water stopping effect is improved, and the water stopping treatment time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm walls, and particularly relates to a water sealing structure for a pre-buried freezing pipe of a diaphragm wall joint pipe. Background Art

[0002] With the deepening of urbanization construction, deep foundation pits and underground projects have also developed rapidly, and diaphragm walls, as a supporting structure, have been widely used. The treatment of the joints of diaphragm walls is crucial for ensuring the structural integrity and waterproof performance of the entire wall. The joints are the connecting parts between different groove sections, and they must work together to withstand earth pressure, water pressure, and other external loads. The joint seams are the weak links in the waterproofing of the entire retaining structure. If the joints are not properly treated, it will not only affect the normal use of the structure but also may cause groundwater erosion of the underground structure, affecting the project safety.

[0003] At present, when leakage occurs at the joint seams, methods such as hole drilling and grouting reinforcement and plugging at the wall seams are often used, which have the disadvantages of limited applicability, complex process, long time consumption, and difficulty in emergency rescue after water seepage, and cannot quickly stop the water seepage at the joints. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a water sealing structure for a pre-buried freezing pipe of a diaphragm wall joint pipe, which can more conveniently and efficiently achieve water stopping treatment.

[0005] To achieve the above purpose, the technical solution provided by the utility model is:

[0006] A water sealing structure for a pre-buried freezing pipe of a diaphragm wall joint pipe, comprising a diaphragm wall, a groove section steel cage, a joint pipe, and a joint pipe steel cage;

[0007] The joint pipe is installed at the joint of the diaphragm wall; the groove section steel cage is arranged in the continuous wall groove section of the diaphragm wall; the joint pipe steel cage is arranged in the joint pipe;

[0008] The joint pipe steel cage is a cylindrical structure with a cavity in the middle, and the diameter of the joint pipe steel cage is smaller than the diameter of the joint pipe;

[0009] The joint pipe steel cage includes transverse ribs and longitudinal freezing pipes, and the transverse ribs and the freezing pipes are connected into a net structure.

[0010] To optimize the above technical solution, the specific measures taken further include:

[0011] The freezing pipe is connected to a freezing system.

[0012] Furthermore, in the connector pipe reinforcement cage, the freezing pipes form several freezing pipe groups in the form of pairwise pairing of adjacent freezing pipes, and the bottoms of two adjacent freezing pipes constituting a freezing pipe group are connected by a U-shaped pipe.

[0013] Among two adjacent freezing pipes constituting a freezing pipe group, the upper end of one freezing pipe is the liquid inlet connecting to the freezing system, and the upper end of the other freezing pipe is the gas outlet.

[0014] Furthermore, the freezing system includes a liquid nitrogen distributor and a liquid nitrogen storage tank, and the liquid nitrogen storage tank is connected to the liquid inlet of the freezing pipe group through the liquid nitrogen distributor.

[0015] The connector pipe is installed in a drill hole at the joint of the diaphragm wall, and the depth of the drill hole is greater than the depth of the diaphragm wall.

[0016] The connector pipe reinforcement cage is arranged along the inner wall of the connector pipe.

[0017] Furthermore, the freezing pipes are of the same length as the connector pipe.

[0018] As a preferred solution, the freezing pipes are made of low-carbon seamless steel pipes.

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

[0020] The present utility model provides a pre-embedded freezing pipe water-stop joint system for the joint of the diaphragm wall. By pre-embedding a reinforcement cage in the connector pipe at the joint of the diaphragm wall and replacing the longitudinal bars of the reinforcement cage with freezing pipes; under the condition of not affecting the original strength of the component, when leakage occurs at the joint, only need to connect to the external freezing system to introduce liquid nitrogen for freezing and water stopping, reducing the water-stop treatment time.

[0021] Since the freezing part is located at the joint, directly freezing the gap can greatly improve the freezing and water-stopping effect and reduce the potential risk brought by leakage.

[0022] This solution can excavate multiple groove sections simultaneously and pour the concrete of the diaphragm wall simultaneously, shortening the construction period and reducing the cost while not affecting the strength of the diaphragm wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic structural diagram of the water-sealing structure of the pre-embedded freezing pipe of the diaphragm wall joint pipe of the present utility model.

[0024] Figure 2 : Installation top view schematic diagram of the water-sealing structure of the pre-embedded freezing pipe of the diaphragm wall joint pipe of the present utility model.

[0025] Figure 3: Schematic top view of the water sealing structure of the pre-embedded freezing pipe in the diaphragm wall joint pipe of the present utility model during use.

[0026] Figure 4 : Schematic sectional view of the water sealing structure of the pre-embedded freezing pipe in the diaphragm wall joint pipe of the present utility model during use.

[0027] In the figure: 1 - Liquid nitrogen tank truck, 2 - Connecting pipe, 3 - Liquid nitrogen storage tank, 4 - Liquid inlet, 5 - Diaphragm wall, 6 - Reinforcement cage, 7 - Air outlet, 8 - Part of the joint pipe inner pile inserted into the soil, 9 - Guide wall, 10 - Liquid nitrogen distributor, 11 - Soil body, 12 - Joint pipe inner pile, 13 - Freezing pipe, 14 - Stirrups of the joint pipe inner pile, 15 - U-shaped pipe, 16 - Groove section, 17 - Joint pipe. Detailed implementation mode

[0028] The above content of the present utility model will be further described in detail below in the form of embodiments. However, it should not be understood that the scope of the above subject matter of the present utility model is limited to the following embodiments. Any technology implemented based on the above content of the present utility model belongs to the scope of the present utility model.

[0029] The present utility model provides a water sealing structure for pre-embedding a freezing pipe 13 in a diaphragm wall joint pipe 5, as Figure 1 shown, including a diaphragm wall 5, a groove section reinforcement cage 6, a joint pipe, and a joint pipe reinforcement cage 14;

[0030] The joint pipe is installed at the joint of the diaphragm wall 5; the groove section reinforcement cage 6 is arranged in the continuous wall groove section 16 of the diaphragm wall 5; the joint pipe reinforcement cage 14 is arranged in the joint pipe 17;

[0031] As Figure 2 shown, the joint pipe reinforcement cage 14 is a cylindrical structure with a cavity in the middle, and the diameter of the joint pipe reinforcement cage 14 is smaller than the diameter of the joint pipe 17; the joint pipe reinforcement cage 14 is arranged along the inner wall of the joint pipe 17.

[0032] The joint pipe reinforcement cage 14 includes transverse stirrups and longitudinal freezing pipes 13, and the stirrups are connected to the freezing pipes 13 to form a reticular structure.

[0033] In the present utility model, the longitudinal bars of the reinforcement cage 6 are replaced by freezing pipes 13, and the freezing pipes 13 are connected to a freezing system. As Figure 3 、 4 shown, the figure also shows the part of the joint pipe inner pile inserted into the soil 8 and the guide wall 9.

[0034] In the joint pipe reinforcement cage 14, the freezing pipes 13 form several groups of freezing pipes 13 in the form of pairwise pairing of adjacent freezing pipes 13, and the bottoms of two adjacent freezing pipes 13 forming a group of freezing pipes 13 are connected by a U-shaped pipe 15.

[0035] Among the two adjacent freezing pipes 13 that make up 13 groups of freezing pipes, the upper end of one freezing pipe 13 is the liquid inlet 4 connecting to the freezing system, and the upper end of the other freezing pipe 13 is the gas outlet 7.

[0036] In some embodiments, the freezing system includes a liquid nitrogen distributor 10 and a liquid nitrogen storage tank 3. The liquid nitrogen storage tank 3 is connected to the liquid inlet 4 of the 13 groups of freezing pipes through the liquid nitrogen distributor 10; the liquid nitrogen storage tank 3 is connected to the liquid nitrogen tank truck 1.

[0037] The joint pipe 17 is installed in the borehole at the joint of the diaphragm wall 5, and the depth of the borehole is greater than the depth of the diaphragm wall 5.

[0038] In some embodiments, the freezing pipe 13 is preferably made of low-carbon seamless steel pipe.

[0039] The specific construction steps of the present utility model are as follows:

[0040] Step 1: Determine the position, length and depth of the diaphragm wall 5 according to the construction requirements, and construct the guide wall according to the specifications.

[0041] Step 2: Determine the length of a single diaphragm wall according to the total length of the diaphragm wall 5 that has been determined, drill holes at the joints of the determined diaphragm wall 5, and the hole depth is much greater than the depth of the diaphragm wall 5 to ensure that the joint pipe 17 does not shift after the soil 11 on both sides of the joint pipe 17 is cleared, and then place the joint pipe 17 in the pipe hole.

[0042] Step 3: Fabricate a cylindrical joint pipe steel reinforcement cage 14 using freezing pipes 13 that are the same length as the joint pipe 17 but have a diameter smaller than the joint pipe 17 as substitute longitudinal bars, so that its size can be smoothly placed into the joint pipe 17, and use the freezing pipes 13 to replace the function of the longitudinal bars as part of the joint pipe steel reinforcement cage 14, and place the fabricated joint pipe steel reinforcement cage 14 into the joint pipe 17.

[0043] Step 4: Carry out trench construction. According to the depth of the diaphragm wall 5 determined by the design requirements, use trench construction machinery to simultaneously excavate all the trenches between the two joint pipes 17 to the specified depth and make slurry walls at the same time.

[0044] Step 5: Clean the sediment at the bottom of the trench. Remove the soil debris and sundries remaining at the bottom of the trench to provide good conditions for the next processes (the trench steel reinforcement cage 6 and concrete pouring) and ensure the wall quality; then slowly lower the trench steel reinforcement cage 6 at the reserved conduit position into the excavated trench by hoisting and align it with the center line of the trench 16.

[0045] Step 6: Use waterproof concrete with admixtures and pour underwater concrete with a direct lift conduit. Stop pouring when the concrete height reaches the design height, and pull out the joint pipe 17 after the concrete initial setting is completed.

[0046] Step Seven: Immediately pour concrete into the circular joint pipe steel reinforcement cage 14 substituting for longitudinal bars such as the freezing pipe 13 until the designed height is reached; thus, the construction of the entire diaphragm wall 5 is completed.

[0047] Step Eight: When leakage problems occur at the joint, immediately connect the reserved liquid inlet 4 outside the embedded freezing pipe 13 to the external freezing system through the connecting pipe 2, and quickly introduce liquid nitrogen into it. Since the liquid nitrogen rapidly vaporizes and takes away a large amount of heat, the seepage water of the soil mass 11 at the gap and within a certain range around it is quickly frozen to form a water-stop curtain, achieving efficient water-stop in a short time.

[0048] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A water sealing structure for pre-buried freezing pipes in underground continuous wall joint pipes, characterized in that: Including underground continuous wall, slot section reinforcement cage, joint pipe and joint pipe reinforcement cage; The joint pipe is installed at the joint of the underground continuous wall; the groove section steel cage is arranged in the continuous wall groove section in the underground continuous wall; the joint pipe steel cage is arranged in the joint pipe; The joint pipe reinforcement cage is a cylindrical structure with a hollow middle portion, and the diameter of the joint pipe reinforcement cage is smaller than the diameter of the joint pipe; The joint pipe reinforcement cage comprises transverse cross bars and longitudinal freezing pipes, and the cross bars and the freezing pipes are connected to form a mesh structure.

2. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 1 is characterized by: The freezing pipe is connected to the freezing system.

3. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 2 is characterized by: In the joint pipe reinforcement cage, the freezing pipes are paired with adjacent freezing pipes in pairs to form a plurality of freezing pipe groups, and the bottoms of two adjacent freezing pipes constituting the freezing pipe group are connected by a U-shaped pipe.

4. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 3 is characterized by: Among the two adjacent freezing pipes constituting the freezing pipe group, the upper end of one freezing pipe is a liquid inlet connected to the freezing system, and the upper end of the other freezing pipe is a gas outlet.

5. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 4 is characterized by: The freezing system comprises a liquid nitrogen distributor and a liquid nitrogen storage tank, and the liquid nitrogen storage tank is connected to the liquid inlet of the freezing pipe group through the liquid nitrogen distributor.

6. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 1 is characterized by: The joint pipe is installed in a drilled hole at a joint of an underground continuous wall, and the depth of the drilled hole is greater than the depth of the underground continuous wall.

7. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 1 is characterized by: The joint pipe reinforcement cage is arranged along the inner wall of the joint pipe.

8. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 1 is characterized by: The freezing pipe and the joint pipe are of equal length.

9. The water sealing structure of the underground continuous wall joint pipe pre-buried freezing pipe according to claim 1, characterized in that: The freezing pipe is made of low-carbon seamless steel pipe.

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