Cold joint treatment device for diaphragm wall curtain

Abstract

The utility model discloses a kind of cold joint processing devices of curtain anti-seepage of mixing pile, it is related to building construction technical field. Including drilling unit and grouting unit. Drilling unit includes drilling machine, hollow drill rod and the variable-diameter drill bit installed at the bottom end of drill rod;Hydraulic circuit is arranged inside drill rod, variable-diameter drill bit is equipped with hydraulic drive assembly and the reaming assembly articulated in drill bit body, and hydraulic drive assembly is used to control reaming assembly to open to carry out reaming cutting to cold joint area. Grouting unit includes grouting machine and the rotary jet grouting pipe with rotary jet nozzle. The device is through first reaming cutting cavity at cold joint, then using grouting unit to rotary jet grouting to cavity, realize the physical occlusion between new and old pile body and close packing, effectively solve the problem that mixing pile cold joint place is not combined closely, easily seepage, improve the anti-seepage reliability of water-stop curtain.

Description

Technical Field

[0001] This utility model relates to the field of foundation construction technology in building engineering, and in particular to a cold joint treatment device for seepage prevention of mixing pile curtain. Background Technology

[0002] In deep foundation pit engineering, cement-soil mixing piles are widely used in the construction of cutoff walls. The water-stopping effect of the mixing pile curtain mainly relies on the tight overlap between the piles. However, in actual construction, construction is often interrupted due to mechanical failures, power outages, and untimely material supplies. When the interval is too long, the previous pile has already begun to set or harden, and the newly constructed pile cannot effectively "thermally fuse" with the old pile, thus forming a "cold joint" at the interface between the two piles. The cold joint is a weak point in the cutoff wall, and groundwater can easily seep into the foundation pit through the cold joint, causing the curtain to fail and even triggering safety accidents such as water inrush and quicksand.

[0003] Traditional methods typically involve driving one or more piles to overlap the cold joint on its outer side. However, this method struggles to ensure that the new piles effectively break down the hardened surface of the old piles and form a tight physical bond, leading to uncertainty in the reliability of seepage prevention. Therefore, a device is needed that can specifically enlarge holes, cut away imperfections, and perform high-pressure grouting repairs in the cold joint area. Utility Model Content

[0004] The purpose of this utility model is to provide a cold joint treatment device for seepage prevention of mixing pile curtain, so as to solve the problem of loose bonding and easy leakage at the cold joint of mixing pile in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cold joint treatment device for seepage prevention using a mixing pile curtain, the cold joint treatment device for seepage prevention using a mixing pile curtain includes: A drilling unit includes a drilling machine, a drill rod, and a variable-diameter drill bit mounted at the bottom end of the drill rod. The drill rod is a hollow structure with hydraulic lines inside. The variable-diameter drill bit includes a drill bit body, a reaming assembly, and a hydraulic drive assembly. The drill bit body is fixedly connected to the bottom end of the drill rod, and a tool receiving groove is formed on the side wall of the drill bit body. The reaming assembly includes a reaming arm disposed in the tool receiving groove, and the bottom end of the reaming arm is hinged to the drill bit body. The hydraulic drive assembly is disposed within the drill bit body. The hydraulic drive assembly includes a cylinder and a telescopic rod. The cylinder is hinged to the drill bit body, and the end of the telescopic rod is hinged to the reaming arm. The hydraulic drive assembly controls the reaming arm to rotate around the hinge point through the hydraulic lines to open or close. The grouting unit includes a grouting machine and a jet grouting pipe connected to the grouting machine, wherein the bottom end of the jet grouting pipe is provided with a jet nozzle.

[0006] In one embodiment, the outer surface of the reaming arm is provided with a plurality of cutting teeth along its length, and the cutting teeth are cemented carbide cutting teeth.

[0007] In one embodiment, the cutting tooth is a flat wedge-shaped tooth with a cutting edge at its front end, the cutting edge being made of cemented carbide material; the cutting tooth is fixed to the soil-facing surface of the reaming arm by welding or bolting.

[0008] In one embodiment, the drill pipe adopts a double-layer tube structure, and the hydraulic pipeline is located between the inner and outer tubes of the drill pipe, or the hydraulic pipeline is an oil passage embedded in the wall of the drill pipe.

[0009] In one embodiment, the outer circumferential surface of the drill bit body is provided with a spiral soil-discharging blade, which is located above the tool receiving groove.

[0010] The above-described technical solutions in the embodiments of this utility model have at least the following technical effects or advantages: The cold joint treatment device for the water-stop curtain provided in this embodiment of the invention uses a variable-diameter drill bit to perform targeted hole enlargement at a depth in the cold joint. During drilling, the enlarger arm retracts to reduce resistance; after reaching the designated depth, the enlarger arm opens hydraulically, cooperating with the rotation of the drill rod to cut a spindle-shaped or dumbbell-shaped cavity at the cold joint. This cutting process effectively removes part of the hardened material from the old and new piles, not only clearing impurities from the contact surface but also creating a physical locking space. Subsequently, high-pressure jet grouting is performed using a grouting unit to fill the cavity and form a repair block, thereby achieving a tight bond and seal at the cold joint and greatly improving the seepage prevention performance of the water-stop curtain. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the cold joint treatment device for seepage prevention of mixing pile curtain provided in this embodiment of the utility model; Figure 2 A schematic diagram of the structure of the drill rod during hole enlargement according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the hole-reaming assembly and hydraulic drive assembly provided in the embodiments of this utility model during hole reaming; Figure 4This is a schematic diagram of the drilling unit after drilling, provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the drilling unit after hole enlargement provided in an embodiment of the present utility model; Figure 6 A schematic diagram of the grouting unit provided in this embodiment of the utility model during grouting; Figure 7 This is a schematic diagram of the cold-sealed joint.

[0013] The labels for the various figures are as follows: 1. Drill rod; 2. Variable diameter drill bit; 3. Jet grouting pipe; 4. Jet grouting nozzle; 5. Soil; 6. Mixing pile; 7. Repair block; 21. Drill bit body; 22. Hole reaming assembly; 23. Hydraulic drive assembly. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0015] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] Please see Figures 1 to 7 This application provides a cold joint treatment device for a mixing pile curtain seepage prevention system, which includes a drilling unit and a grouting unit.

[0019] The drilling unit is the core component for cold joint excavation and borehole reaming. It includes a drilling rig (not shown in the figure, but a conventional power source), a drill rod 1, and a variable-diameter drill bit 2 mounted at the bottom of the drill rod 1. The drill rod 1 is designed as a hollow structure. To supply oil to the hydraulic components at the bottom, the drill rod 1 employs a double-layer pipe structure, with its hydraulic lines arranged between the inner and outer pipes, utilizing space while protecting the pipelines. The variable-diameter drill bit 2 includes a drill bit body 21, a reaming assembly 22, and a hydraulic drive assembly 23. The drill bit body 21 is fixed to the bottom of the drill rod 1, and its side wall has a tool receiving groove to accommodate the reaming assembly in its retracted state. To facilitate the removal of cuttings generated during drilling, spiral soil-discharging blades are installed on the outer circumferential surface of the drill bit body 21, above the tool receiving groove.

[0020] The reaming assembly 22 includes a reaming arm disposed within a receiving groove. The bottom end of the reaming arm is hinged to the drill bit body 21 via a pin, allowing it to open like an umbrella. To enhance its ability to cut and break cement-soil piles, the outer surface of the reaming arm is provided with several cutting teeth along its length. These cutting teeth are made of carbide cutting teeth. Preferably, the cutting teeth are designed as flat wedge-shaped teeth with a cutting edge made of carbide at the front end, and are fixed to the soil-facing surface of the reaming arm by welding or bolting.

[0021] The hydraulic drive assembly 23 is concealed inside the drill bit body 21 and is used to provide power. Figure 3 As shown, it includes a cylinder and a telescopic rod. The cylinder is hinged to the drill bit body 21, and the end of the telescopic rod is hinged to the upper middle part of the reaming arm. The hydraulic drive assembly 23 is connected to the hydraulic control system on the ground through the hydraulic lines in the drill rod 1, thereby controlling the rotation of the reaming arm around the bottom hinge point to achieve opening (reaming state) or retraction (drilling / lifting state).

[0022] The grouting unit includes a grouting machine (not shown in the figure, which is an existing conventional grouting equipment) and a jet grouting pipe 3. The bottom end of the jet grouting pipe 3 is equipped with a jet nozzle 4 for spraying high-pressure grout.

[0023] The specific working principle and operation process of this device are as follows (in conjunction with...) Figures 4 to 7 ): 1. Drilling positioning: such as Figure 4 As shown, at the location where a cold joint appears in the mixing pile 6, a drilling unit is used to drill a hole in the soil 5 outside the original curtain mixing pile. During the vertical downward drilling process, the hydraulic drive component 23 controls the reamer arm to be in a retracted state, completely retracted into the drill bit body 21. At this time, the drill bit diameter is at its smallest, which facilitates rapid drilling until the depth of the cold joint is reached.

[0024] 2. Point-based hole enlargement: such as Figure 2 , Figure 3 and Figure 5 As shown, after reaching the cold joint depth, the operator drives the hydraulic drive assembly 23 via the hydraulic system, extending the telescopic rod and pushing the reaming arm of the reaming assembly 22 outward. Simultaneously, the drilling rig drives the drill rod 1 to rotate. At this time, the extended reaming arm, in conjunction with the rotation of the drill rod, cuts and enlarges the cold joint area. Due to the outward extension of the reaming arm, the cutting range expands, resulting in a spindle-shaped or dumbbell-shaped cavity being cut out at the cold joint. This cavity spans the cold joint interface, simultaneously removing a portion of the pile body material from both the old and new piles, thereby clearing the weak layer or mud cake on the cold joint interface.

[0025] 3. Drilling: After the hole is enlarged, the hydraulic drive component 23 reverses its movement, driving the reamer arm to retract inward and return to its original position. Then the drilling rig lifts the drill rod 1, completely removing the drill rod from the hole.

[0026] 4. Grouting repair: such as Figure 6 As shown, the jet grouting pipe 3 of the grouting unit is inserted into the newly enlarged hole. The grouting machine is started, and high-pressure grout (such as cement grout) is sprayed out through the jet nozzle 4 at the bottom of the jet grouting pipe 3 to perform high-pressure jet grouting in the enlarged hole area.

[0027] 5. Formation of a restoration: such as Figure 7 As shown, after the grout solidifies, a dense repair block 7 is formed at the cold joint. Since the repair block 7 is formed by filling after cutting off part of the pile body, it forms a tight interlocking structure with the original mixing pile 6, thereby effectively blocking the seepage channel.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold joint treatment device for a mixing pile curtain seepage prevention system, characterized in that, The cold joint treatment device for the seepage prevention of the mixing pile curtain includes: A drilling unit includes a drilling machine, a drill rod, and a variable-diameter drill bit mounted at the bottom end of the drill rod. The drill rod is a hollow structure with hydraulic lines inside. The variable-diameter drill bit includes a drill bit body, a reaming assembly, and a hydraulic drive assembly. The drill bit body is fixedly connected to the bottom end of the drill rod, and a tool receiving groove is formed on the side wall of the drill bit body. The reaming assembly includes a reaming arm disposed in the tool receiving groove, and the bottom end of the reaming arm is hinged to the drill bit body. The hydraulic drive assembly is disposed within the drill bit body. The hydraulic drive assembly includes a cylinder and a telescopic rod. The cylinder is hinged to the drill bit body, and the end of the telescopic rod is hinged to the reaming arm. The hydraulic drive assembly controls the reaming arm to rotate around the hinge point through the hydraulic lines to open or close. The grouting unit includes a grouting machine and a jet grouting pipe connected to the grouting machine, wherein the bottom end of the jet grouting pipe is provided with a jet nozzle.

2. The cold joint treatment device for seepage prevention using a mixing pile curtain as described in claim 1, characterized in that: The outer surface of the reaming cutter arm is provided with a number of cutting teeth along its length, and the cutting teeth are cemented carbide cutting teeth.

3. The cold joint treatment device for seepage prevention using mixing pile curtain as described in claim 2, characterized in that: The cutting teeth are flat wedge-shaped teeth with a cutting edge at the front end, which is made of cemented carbide material; the cutting teeth are fixed to the soil-facing surface of the reaming arm by welding or bolting.

4. The cold joint treatment device for seepage prevention using a mixing pile curtain as described in claim 1, characterized in that: The drill pipe adopts a double-layer tube structure, and the hydraulic pipeline is located between the inner and outer tubes of the drill pipe.

5. The cold joint treatment device for seepage prevention using mixing pile curtain as described in claim 1, characterized in that: The outer circumferential surface of the drill bit body is provided with spiral soil-discharging blades, which are located above the tool receiving groove.

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