Construction method of waterproof curtain
By separating deep hole grooves and laying anti-seepage films in batches, combined with the protection of spacers and embedded parts, the problem of easy damage to the anti-seepage films during construction is solved, and the anti-seepage effect and engineering of the water-stop curtains are improved. quality.
Patent Information
- Application Number
- CN202410879803.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2024-12-31
AI Technical Summary
In the existing water-stop curtain construction methods, the anti-seepage film is easily folded and damaged during the construction process, affecting the anti-seepage effect.
Multiple rectangular deep hole grooves are separated by spacers, anti-seepage film is laid in batches and grouted in batches. By pouring concrete components in the grooves, protecting the anti-seepage film with spacers and embedded parts, and bonding with thermoplastic resin adhesive. Connect to form a continuous waterproof layer.
It improves the engineering quality and anti-seepage effect of the water-stop curtain, reduces the risk of anti-seepage film damage, and ensures the improvement of waterproof performance.
Smart Images
Figure CN119221509A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engineering construction waterproofing, and in particular to a construction method of a water-stop curtain. Background Art
[0002] Waterstop curtain is a waterproof structure commonly used in engineering construction, such as a waterproof barrier buried underground, which is mainly used to control and prevent water penetration and is widely used in building construction, underground engineering and foundation engineering. Specifically, in soil remediation and landfills, the main function of waterstop curtain is to prevent moisture, pollutants or waste from penetrating into the deep soil or groundwater, thereby reducing the risk of environmental pollution, preventing the further spread of pollution, and protecting the quality of soil and groundwater.
[0003] In the prior art, the construction method of the water-stop curtain includes trenching, laying an impermeable membrane in the trench, and grouting steps. During the construction process, the impermeable membrane is laid mainly by slowly laying the rolled impermeable membrane in the entire trench through large-scale mechanical equipment. Although the operation is simple, the impermeable membrane is easily folded and damaged during the grouting process, affecting the construction operation and the anti-seepage effect of the water-stop curtain formed by pouring. Summary of the invention
[0004] In view of the existing technical problems, the present application provides a construction method of a water-stop curtain to improve the anti-seepage effect of the water-stop curtain.
[0005] The construction method of the water stop curtain in this application comprises the following steps:
[0006] A plurality of first deep hole grooves are arranged at intervals along the extension direction of the water-stop curtain, wherein the cross section of the first deep hole groove is a rectangular structure having a length side and a width side;
[0007] Laying a first impermeable membrane on four side surfaces and a bottom surface of the first deep hole groove;
[0008] Casting a first concrete component in the first deep hole groove;
[0009] A second deep hole groove is provided between two adjacent first deep hole grooves, and the cross section of each second deep hole groove is a rectangular structure having a length side and a width side;
[0010] Cutting the first anti-seepage membrane on the width side of the first deep hole groove along the midline and unfolding it toward the length side of the first deep hole groove;
[0011] Laying a second impermeable membrane on two side surfaces and a bottom surface of the length side of the second deep hole groove, and overlapping the first impermeable membrane;
[0012] Cast a second concrete component in the second deep hole groove.
[0013] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.
[0014] Optionally, after the excavation of the first deep hole groove is completed, an isolation piece is set on the width side of the first deep hole groove; the second deep hole groove extends to the isolation piece, and the isolation piece is removed after the groove excavation is completed.
[0015] Optionally, after the first impermeable membrane is laid, embedded parts close to the first impermeable membrane are inserted at the four corners of the first deep hole groove.
[0016] Optionally, after the second concrete component is manufactured, the embedded parts are removed to form holes, and the holes are filled with an adhesive for bonding the first impermeable membrane and the second impermeable membrane.
[0017] Optionally, the first anti-seepage membrane and the second anti-seepage membrane are both HDPE films; and the adhesive is a thermoplastic resin adhesive.
[0018] Optionally, the first anti-seepage membrane is a bag-like structure formed by cutting, folding and welding a film roll.
[0019] Optionally, the second anti-seepage membrane is a U-shaped structure formed by cutting and folding a film roll.
[0020] Optionally, the second impermeable membrane overlaps the embedded part and overlaps with the first impermeable membrane at the embedded part.
[0021] Optionally, the second concrete member has a metal frame.
[0022] Optionally, the mud produced by opening the first deep hole groove is used to prepare the first concrete component, and the mud produced by opening the second deep hole groove is used to prepare the second concrete component.
[0023] Compared with the prior art, the construction method provided in the present application can improve the engineering quality of the water-stop curtain by spacing into grooves, laying anti-seepage membranes in batches, and grouting in batches, thereby ensuring the anti-seepage effect of the water-stop curtain. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 Flow chart of a construction method of a water-stop curtain in one embodiment;
[0025] Figure 2 A schematic diagram of excavating a first deep hole trench and laying a first impermeable membrane in an embodiment;
[0026] Figure 3It is a schematic diagram of excavating a second deep hole trench and laying a second impermeable membrane in one embodiment.
[0027] The reference numerals in the figures are described as follows:
[0028] 100, first deep hole groove; 110, length side; 120, width side; 200, first anti-seepage membrane; 300, first concrete component; 400, second deep hole groove; 500, second anti-seepage membrane; 600, isolation member; 700, embedded member. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0031] See also Figures 1 to 3 An embodiment of the present application provides a method for constructing a water-stop curtain, comprising the following steps:
[0032] (1) A plurality of first deep hole grooves 100 are arranged at intervals along the extension direction of the water-stop curtain. The cross section of the first deep hole groove 100 is a rectangular structure with a length side 110 and a width side 120; (2) A first impermeable membrane 200 is laid on the four side surfaces and the bottom surface of the first deep hole groove 100; (3) A first concrete component 300 is cast in the first deep hole groove 100; (4) A second deep hole groove 400 is opened between two adjacent first deep hole grooves 100. The cross section of each second deep hole groove 400 is a rectangular structure with a length side and a width side; (5) The first impermeable membrane 200 where the width side 120 of the first deep hole groove 100 is located is cut along the center line and unfolded toward the length side 110 of the first deep hole groove 100; (6) A second impermeable membrane 500 is laid on the two side surfaces and the bottom surface of the length side of the second deep hole groove 400, and the first impermeable membrane 200 is overlapped; (7) A second concrete component is cast in the second deep hole groove 400.
[0033] In this embodiment, an interval slotting operation method is adopted, and the second deep hole groove 400 is opened after the first concrete component 300 is poured in each first deep hole groove 100, which is conducive to avoiding the collapse of the soil structure due to large-scale continuous construction. Furthermore, compared with the traditional construction method of the water-stop curtain, the batch membrane and batch grouting can not only reduce the difficulty of membrane laying, but also not easily cause the anti-seepage membrane to fold and break during the grouting process, which helps to improve the quality of the project, thereby ensuring the anti-seepage performance of the water-stop curtain.
[0034] In one embodiment, after the excavation of the first deep hole groove 100 is completed, an isolation member 600 is set on the width side of each first deep hole groove 100. The isolation member 600 can be a metal partition, such as a steel plate. After the isolation member 600 is inserted, the first impermeable membrane 200 is laid. The second deep hole groove 400 is excavated and extends to the isolation member 600. After the groove is completed, the isolation member 600 is removed. In this embodiment, the isolation member 600 plays a role of temporary isolation, which can effectively avoid the first impermeable membrane 200 from being damaged when the second deep hole groove 400 is excavated.
[0035] See also Figure 2 , 3 In the illustrated embodiment, after the first impermeable membrane 200 is laid, embedded parts 700 close to the first impermeable membrane 200 are inserted at the four corners of the first deep hole groove 100. Accordingly, after the first impermeable membrane 200 where the width side of the first deep hole groove 100 is located is cut along the center line, it is unfolded toward the length side of the first deep hole groove 100 and close to the embedded parts 700, and the second impermeable membrane 500 overlaps the first impermeable membrane 200 and also surrounds the outer periphery of the embedded parts 700. Among them, the embedded parts 700 are stainless steel pipes.
[0036] After the second concrete component is manufactured, the embedded part 700 is removed to form a hole, and then the hole is filled with an adhesive for bonding the first impermeable membrane 200 and the second impermeable membrane 500 .
[0037] In terms of material selection, the first anti-seepage membrane 200 and the second anti-seepage membrane 500 can both be high-density polyethylene films (HDPE films), and their density is 0.940-0.976 g / cm 3 , has good heat resistance, cold resistance, chemical stability, as well as appropriate toughness and mechanical strength, and can effectively prevent the leakage of pollutants and moisture.
[0038] The adhesive can be a thermoplastic resin adhesive, such as polyethylene (HDPE). During construction, the HDPE particles are preheated and melted, and then the molten HDPE is poured into the hole. After cooling, the first waterproof membrane 200 and the second waterproof membrane 500 can be bonded at the hole to form a continuous waterproof layer.
[0039] For the convenience of laying, the first impermeable membrane 200 is a bag-like structure formed by cutting, folding and welding a film coil. Specifically, according to the size of the first deep hole groove 100, the film coil is cut into a membrane sheet of a certain length and width, wherein the length matches the depth of the first deep hole groove 100, the width side of the membrane sheet is folded to form four side surfaces, the dimensions of the four side surfaces match the dimensions of the four side surfaces of the first deep hole groove 100, and then the two length sides are welded, and a width side is welded to the length side to form a bag-like structure. During construction, the first impermeable membrane 200 is sunk to the bottom of the first deep hole groove 100.
[0040] The second impermeable membrane 500 is a U-shaped structure formed by cutting and folding a film coil. Specifically, according to the size of the second deep hole groove 400, the film coil is cut into a membrane sheet with a certain width and length, wherein the width matches the sum of the bottom width of the second deep hole groove 400 and the depth of the two sides, and the length has a margin compared to the length of the second deep hole groove 400, so as to overlap with the first impermeable membrane 200. During construction, the two length sides are extracted and the middle is sunk to lay on the second deep hole groove 400, and the length side of the second impermeable membrane 500 extends to the embedded part 700 and is close to the embedded part 700, and overlaps with the first impermeable membrane 200 at the embedded part.
[0041] In order to ensure the overall structural strength of the water-stop curtain, the second concrete component has a metal frame, such as a steel frame. During construction, the metal frame can be placed in the second deep hole groove 400 after the second impermeable membrane 500 is laid. Further, the first concrete component 300 can also have a metal frame, such as a steel frame. During construction, the metal frame is pre-installed in the first impermeable membrane 200 and then placed in the first deep hole groove 100 as a whole.
[0042] In one embodiment, the mud produced by excavating the first deep hole 100 is used to prepare the first concrete component 300, and the mud produced by excavating the second deep hole 400 is used to prepare the second concrete component. In this application, the mud excavated from the slotted hole is used to prepare concrete, and the raw materials can be backfilled in situ after mixing on site, which is conducive to reducing the cost of engineering soil pile and soil pile treatment.
[0043] Specifically, the raw materials of each concrete component include in-situ soil and cement, and the mass ratio of the two is 20 to 50:10, preferably 20 to 40:10, and more preferably 30:10.
[0044] In one embodiment, the raw materials of each concrete component also include water reducer and bentonite, specifically, by weight, including 50-70 parts of in-situ soil, 10-20 parts of cement, 1-1.5 parts of water reducer and 5-15 parts of bentonite. Before pouring, the dry material formed by mixing the raw materials is pre-stirred with an appropriate amount of water to form a uniform mud suitable for pouring. Preferably, by weight, the raw materials of each concrete component include 50-60 parts of in-situ soil, 12-16 parts of cement, 1-1.1 parts of water reducer and 10-15 parts of bentonite. Further preferably, the raw materials of each concrete component include 60 parts of in-situ soil, 15 parts of cement, 1 part of water reducer and 10 parts of bentonite.
[0045] To facilitate pouring, the concrete feeding pipe and vibrating rod are placed in the bag-shaped first impermeable membrane 200, and then the whole is placed in the first deep hole groove 100 under the crane. After grouting and vibration compaction into the first impermeable membrane 200, the feeding pipe and vibrating rod are removed.
[0046] Application Example 1: Pilot Project at Landfill
[0047] The landfill includes a foundation pit for storing garbage. A water-stop curtain is set downstream of the water flow in the foundation pit and outside the landfill. The specific operation is as follows:
[0048] (1) Excavation of the first deep hole groove: along the extension direction of the predetermined water-stop curtain, the "jump excavation method" is used to perform interval grooving operations to excavate multiple first deep hole grooves with rectangular cross-sections. In each first deep hole groove, when the construction design depth is reached, a steel plate is inserted on the width side of the first deep hole groove by a plate inserter as an isolation piece to play a temporary partition role.
[0049] (2) Place the first anti-seepage membrane: First, accurately measure the actual slot size. The length of the HDPE membrane is determined according to the measured slot depth, and the membrane width is the slot perimeter. After leaving a margin, weld the long side and the short side of the HDPE membrane to form a "bag" with the slot depth, which is the first anti-seepage membrane.
[0050] (3) Mud preparation: The raw material components are, by weight, 60 parts of in-situ soil obtained from excavating the first deep hole trench, 15 parts of cement, 1 part of water reducing agent, 10 parts of bentonite and an appropriate amount of water. The components are mixed and stirred thoroughly before use.
[0051] (4) Mud backfilling the first deep hole slot: After placing the mud feeding pipe and concrete vibrator into the first impermeable membrane, use a crane to place the whole thing to the bottom of the slot, and place and fix sealed steel pipes at the four corners of the slot. Inject the previously mixed mud into the first impermeable membrane and vibrate and compact it at the same time to make the concrete densely combined and ensure that the first impermeable membrane is close to the slot wall and the steel pipes at the four corners without leaving cavitation; after the mud solidifies, the first concrete component is formed.
[0052] (5) Excavation of the second deep hole groove: The second deep hole groove is opened between two adjacent first deep hole grooves. Since a steel plate is inserted before, the operation process of the groove forming machine will not damage the existing first anti-seepage membrane. After the groove reaches the designed depth, the embedded steel plate is removed. At this time, the first anti-seepage membrane can be contacted. The first anti-seepage membrane on the width side of the first deep hole groove is cut along the center line and unfolded to the length side of the first deep hole groove, ensuring that the unfolded edge is still close to the steel pipe.
[0053] (6) Lowering the second anti-seepage membrane: Lower the second anti-seepage membrane (no longer welded into a bag, directly lift the two ends and lower the middle to the bottom of the slot hole) and the pre-welded steel frame to the bottom of the second deep hole slot, ensuring that the front and rear HDPE membranes are fully in contact with the steel pipe and overlap each other.
[0054] (7) Mud preparation: The raw material components are, by weight, 60 parts of in-situ soil obtained from excavating the second deep hole trench, 15 parts of cement, 1 part of water reducing agent, 10 parts of bentonite and an appropriate amount of water. The components are mixed and stirred thoroughly before use.
[0055] (8) Backfilling the second deep hole with mud: After lowering the mud feeding pipe and concrete vibrator to the bottom of the groove, inject the stirred mud into the second impermeable membrane and vibrate and compact it. After solidification, the second concrete component is formed. At this time, the underground continuous wall is formed.
[0056] (9) After the poured material is fully solidified, the pre-buried steel pipe is pulled out to form holes, and the HDPE film at the holes is bonded with melted HDPE particles to form a continuous waterproof layer.
[0057] The permeability coefficient of the water-stop curtain obtained in this application example is ≤10 -7 cm / s, unconfined compressive strength ≥1.5MPa, width 0.6~0.8m, total length 400~600m, depth 18~20m, which can effectively block the migration of landfill leachate and contaminated groundwater.
[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.
[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. The construction method of the water-stop curtain is characterized in that: The following steps are involved: A plurality of first deep hole grooves are arranged at intervals along the extension direction of the water-stop curtain, wherein the cross section of the first deep hole groove is a rectangular structure having a length side and a width side; Laying a first impermeable membrane on four side surfaces and a bottom surface of the first deep hole groove; Casting a first concrete component in the first deep hole groove; A second deep hole groove is provided between two adjacent first deep hole grooves, and the cross section of each second deep hole groove is a rectangular structure having a length side and a width side; Cutting the first impermeable membrane on the width side of the first deep hole groove along the midline and unfolding it toward the length side of the first deep hole groove; Laying a second impermeable membrane on two side surfaces and a bottom surface of the length side of the second deep hole groove, and overlapping the first impermeable membrane; Cast a second concrete component in the second deep hole groove.
2. The construction method according to claim 1, characterized in that: After the first deep hole groove is excavated, an isolation piece is arranged on the width side of the first deep hole groove; The second deep hole groove extends to the isolation piece, and the isolation piece is removed after the groove is completed.
3. The construction method according to claim 1, characterized in that: After the first impermeable membrane is laid, embedded parts close to the first impermeable membrane are inserted at the four corners of the first deep hole groove.
4. The construction method according to claim 3, characterized in that: After the second concrete component is manufactured, the embedded parts are removed to form holes, and the holes are filled with an adhesive for bonding the first impermeable membrane and the second impermeable membrane.
5. The construction method according to claim 4, characterized in that: The first anti-seepage membrane and the second anti-seepage membrane are both HDPE films; the adhesive is a thermoplastic resin adhesive.
6. The construction method according to claim 3, characterized in that: The first anti-seepage membrane is a bag-shaped structure formed by cutting, folding and welding a film coil.
7. The construction method according to claim 6, characterized in that: The second anti-seepage membrane is a U-shaped structure formed by cutting and folding a film roll.
8. The construction method according to claim 6, characterized in that: The second impermeable membrane overlaps the embedded component and overlaps with the first impermeable membrane at the embedded component.
9. The construction method according to claim 1, characterized in that: The second concrete member has a metal frame.
10. The construction method according to claim 1, characterized in that: The mud material produced by opening the first deep hole groove is used to prepare the first concrete component, and the mud material produced by opening the second deep hole groove is used to prepare the second concrete component.