Construction method of parameterized steel cap pile head waterproof device

Abstract

The application discloses a construction method of a parameterized steel cap pile head waterproof device, and relates to the technical field of pile head waterproofing. The construction method of the parameterized steel cap pile head waterproof device is as follows: in the first step, according to the engineering practice, pile head waterproof devices matched with different parameters such as pile types and diameters can be prefabricated in a factory. Before installing the pile cap bottom plate, it is ensured that the surface of the pile head is clean and tidy, and free of impurities such as oil stains and dust. The uneven or damaged surface of the pile head is polished or repaired. The construction method of the parameterized steel cap pile head waterproof device forms an integral whole through mechanical occlusion connection and waterproof coiled material, and covers the whole pile head. The first waterproof measure is completely closed, the problem of underground engineering seepage water is solved from the source, and the influence of seepage water on buildings caused by imperfect waterproofing of the pile head part is eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile head waterproofing, in particular to a construction method of a parameterized steel cap pile head waterproofing device. BACKGROUND

[0002] Pile head waterproofing is part of the building field, specifically related to pile foundation engineering technology, and is widely used in building, bridge, wharf and other engineering.

[0003] Pile head waterproofing is an important link to ensure the waterproof function of building foundation. Once the pile head waterproofing problem occurs, it will lead to water seepage, dampness inside the building, and even affect the safety and service life of the building. Therefore, great attention must be paid to pile head waterproofing construction, and strict construction specifications and requirements must be followed.

[0004] The technical content of pile head waterproofing includes the selection of waterproofing materials, construction process, and waterproofing treatment points. Waterproofing materials include cement-based permeable crystalline waterproofing coating, acrylate waterproofing coating, SBS modified asphalt waterproofing membrane, etc. These materials have good permeable crystalline properties, weather resistance, waterproofing performance and tensile strength, and are suitable for different environments and conditions. The construction process includes pile head treatment, brushing of base treatment agent, additional layer treatment, waterproofing membrane pasting, and protection layer construction. Each step has its specific requirements and precautions to ensure waterproofing effect and engineering quality.

[0005] The implementation of pile head waterproofing is of great significance to improve the safety and reliability of pile foundation engineering. It can improve the overall safety and long-term stability of pile foundation engineering.

[0006] Building waterproofing effect is an important factor affecting building quality and service life. It is also a key point that people pay close attention to during building use. Especially the waterproofing of underground buildings has a direct impact on the use of buildings. The main measures of underground building waterproofing include building waterproofing method and structural self-waterproofing. Building waterproofing method as the first waterproofing measure is crucial to building waterproofing. A key technology for floor waterproofing is pile head waterproofing. As we all know, during the construction process of the basement, the conventional method of floor is to lay waterproofing membrane. If the waterproofing membrane can form a closed space, it can achieve good waterproofing effect. However, for pile foundation, the specification requires that the pile head should have a certain anchoring length in the floor, generally 50-100mm. At this time, when the waterproofing membrane is laid to the pile edge, the pile head protrudes and the waterproofing membrane cannot be completely closed. When laid to the pile edge, it is disconnected. In order to make the waterproofing membrane fit the pile edge as much as possible, multiple pieces of membrane need to be cut and pasted, which leads to more joints of the membrane at the pile head and serious water leakage risks.

[0007] Another way, waterproof layer around the pile head construction, using multiple waterproof measures, such as first brushing primer, then construction waterproof coating or pasting waterproofing membrane. The first film coating, need to wait for its curing, can be on the second film coating, the second along the vertical direction of the first, should be noted that the concave and convex full coating, and thick and thin uniform, prevent cracking. The disadvantage of this process is that the construction period is long, and the pile head cleaning degree and the worker's technical requirements are higher. A little negligence is easy to cause the pile head to seep water. SUMMARY

[0008] (I) Technical problems solved

[0009] In view of the deficiencies of the prior art, the present application provides a construction method of parameterized steel cap pile head waterproof device, which solves the problems existing in the prior art.

[0010] (II) Technical solutions

[0011] In order to achieve the above object, the present application is realized by the following technical scheme: a construction method of parameterized steel cap pile head waterproof device, the specific operation is as follows:

[0012] Step 1: According to the actual engineering, according to the different parameters such as pile type, diameter, etc., the pile head waterproof device matched with them can be prefabricated in the factory. Before installing the pile cap bottom plate, the surface of the pile head should be clean, tidy, free of oil stains, dust and other impurities. The uneven or damaged surface of the pile head is polished or repaired. After preparation, the bottom plate is sleeved on the pile head.

[0013] Step 2: The first layer of rubber gasket is laid on the sawtooth surface of the steel cap bottom plate. The sawtooth surface effectively increases the contact area, and the rubber gasket can provide better sealing effect. The combination of sawtooth and rubber gasket perfectly blocks the path of groundwater infiltration, and has good waterproof effect.

[0014] Step 3: After the bottom plate is installed and the first layer of rubber gasket is laid, the waterproofing membrane is started to be laid in the basement range, and the waterproofing membrane is laid to the pile edge and pressed on the first layer of rubber gasket, with a minimum lap distance of 300mm. In order to prevent displacement of the waterproofing membrane and the rubber gasket, a layer of waterproof glue is applied on the rubber gasket before the waterproof glue is solidified, and the waterproofing membrane is laid on the rubber gasket.

[0015] Step 4: A layer of rubber gasket is laid on the waterproofing membrane, which requires the same as the first layer of rubber gasket. The upper and lower layers of rubber gasket are tightly clamped around the waterproofing membrane through the pressure.

[0016] Step 5: After the second layer of rubber gasket is installed, the steel cap pressing plate can be installed. The lower surface of the steel cap pressing plate is also made into sawtooth shape and completely engages with the upper surface sawtooth of the bottom plate.

[0017] Step 6: Next, install the steel cap nuts. Install one steel cap nut on each steel cap bolt. The tightness of the nut directly affects the waterproofing effect. Laboratory tests have determined the minimum pressure and torque values ​​required for waterproofing. When installing the nuts, use a torque wrench to ensure sufficient pressure between the pressure plate and the base plate to ensure a waterproofing effect. After tightening the nuts, spot weld them in place to prevent loosening later. The nuts should be installed symmetrically from the inside out. Apply a cement-based penetrating crystalline waterproofing coating to the entire area around the nuts.

[0018] Step 7: Finally, install the pile head anchor bars. Insert the anchor bars through the pre-installed steel cap sleeves and secure them to the pile head using the threaded ends. Currently, the waterproof membrane and pile cap have formed a closed system; the only area with potential leakage is the gap between the anchor bars and the sleeve. This gap will be filled and sealed with waterproof grout.

[0019] Preferably, the steel cap anchor bolt and steel cap sleeve should be pre-welded to the steel cap base plate. The waterproof membrane, rubber gasket, and steel cap pressure plate should have round holes drilled at the corresponding positions of the steel cap anchor bolt, with the holes preferably large enough to allow the steel column anchor bolt to pass through.

[0020] (III) Beneficial Effects

[0021] This invention provides a construction method for a parameterized steel cap pile head waterproofing device. It has the following beneficial effects:

[0022] The construction method of this parametric steel cap pile head waterproofing device involves mechanically interlocking with the waterproof membrane to form a unified whole, simultaneously covering the entire pile head. This ensures a complete closure of the first layer of waterproofing, addressing the problem of water leakage in underground engineering at its source and eliminating the impact on buildings caused by inadequate waterproofing at the pile head. Attached Figure Description

[0023] Figure 1 Plan view of the steel cap base plate.

[0024] Figure 2 Cross-sectional view of the steel cap base plate.

[0025] Figure 3 Plan view of the rubber gasket.

[0026] Figure 4 Plan view of the steel cap pressure plate.

[0027] Figure 5 Detailed cross-sectional view of the device.

[0028] Figure 6 Step 1 diagram.

[0029] Figure 7 The diagram for step two.

[0030] Figure 8 Waterproofing membrane laying schematic diagram.

[0031] Figure 9 Third step schematic diagram

[0032] Figure 10 Fourth step schematic diagram.

[0033] Figure 11 Fifth step schematic diagram.

[0034] Figure 12 Sixth step schematic diagram.

[0035] Figure 13 Seventh step schematic diagram.

[0036] In the figure: 1, steel cap bottom plate; 2, steel cap bolt; 3, steel cap sleeve; 4, waterproofing membrane; 5, rubber gasket; 6, steel cap pressing plate; 7, steel cap nut; 8, pile head waterproof grouting material; 9, pile head anchor bar. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0038] Please refer to Figures 1-13 The present application provides a technical solution: a construction method of a parameterized steel cap pile head waterproof device, which specifically operates as follows:

[0039] First step: According to the actual engineering, the pile head waterproof device matched with different parameters such as pile type and diameter can be prefabricated in the factory. Before installing the steel cap bottom plate, the surface of the pile head should be clean and tidy, without oil stains, dust and other impurities. The uneven or damaged surface of the pile head should be polished or repaired. After preparation, the bottom plate is sleeved on the pile head.

[0040] Second step: The first layer of rubber gasket 5 is laid on the jagged surface of the brim area of the steel cap bottom plate. The jagged surface effectively increases the contact area, and the rubber gasket can provide better sealing effect. The combination of the jagged surface and the rubber gasket perfectly blocks the path of groundwater infiltration, achieving good waterproof effect.

[0041] Third step: After the bottom plate is installed and the first layer of rubber gasket is laid, waterproof coiled material 4 is laid in the basement range. The waterproof coiled material is laid to the pile edge and is pressed on the first layer of rubber gasket. The minimum overlap distance between the rubber gasket and the waterproof coiled material is 300 mm. To prevent displacement of the waterproof coiled material and the rubber gasket, a layer of waterproof adhesive is applied on the rubber gasket before the waterproof coiled material is laid.

[0042] Fourth step: A second layer of rubber gasket 5 is laid on the waterproof coiled material. The rubber gasket is required to be the same as the first layer of rubber gasket. The upper and lower layers of rubber gaskets will tightly clamp the waterproof coiled material in the middle through the action of pressure.

[0043] Fifth step: After the second layer of rubber gasket is installed, the steel cap pressing plate 6 can be installed. The lower surface of the steel cap pressing plate is also serrated and completely engages with the serrations on the upper surface of the bottom plate.

[0044] Sixth step: The next step is to install the steel cap nut 7. One steel cap nut is installed on each steel cap bolt 2. The tightness of the nut directly affects the waterproof effect. Through laboratory testing, the minimum pressure value and the torque value of the nut that can achieve waterproof effect are obtained. When installing the nut, a torque wrench can be used to ensure that there is enough pressure between the pressing plate and the bottom plate to ensure waterproof effect. After the nut is tightened, spot welding is performed in time to prevent loosening in the later stage. The installation sequence of the nut should follow the inside-out and symmetrical installation. The nut is fully coated with cement-based penetrating crystalline waterproof coating around the perimeter.

[0045] Seventh step: Finally, the pile head anchor is installed. The anchor is inserted through the reserved steel cap sleeve 3 and fixed on the pile head of the engineering pile using the end thread. At present, the waterproof coiled material and the pile cap have formed a closed whole, and the only remaining gap that may leak water is the gap between the anchor and the sleeve. The gap is filled with waterproof grouting material 8.

[0046] The steel cap anchor bolt 2 and the steel cap sleeve 3 should be welded on the steel cap bottom plate 1 in advance. The waterproof coiled material 4, the rubber gasket 5, and the steel cap pressing plate 6 should be drilled round holes according to the corresponding positions of the steel cap anchor bolt. The hole should be suitable for passing through the steel column anchor bolt.

[0047] Example:

[0048] This invention provides a parameterized steel cap pile head waterproofing device and its construction method. It is applied to underground engineering projects with pile foundations. It can effectively prevent water leakage at the pile head due to inadequate installation of waterproof membrane. According to specifications, the pile head should be anchored 50-100mm into the base slab. When the waterproof membrane is laid to the pile edge, it is cut, and a complete steel cap made of a rigid material is fitted onto the pile head. A mechanical interlocking device is invented on the edge of the steel cap to tightly connect with the waterproof membrane. The interlocking surface is serrated, increasing the interlocking force and the length of the water-blocking path, effectively preventing water leakage. After the waterproofing device and the membrane interlock, they form a closed whole, effectively preventing groundwater from penetrating the waterproof layer. The advantages of this invention are convenient construction and higher reliability.

[0049] The device of this invention is mainly prefabricated in the factory and installed directly on site. It is simple, convenient, and has a significant waterproof effect. It can be mainly divided into the following four parts.

[0050] (I): Base Plate. It consists of three main components: steel cap base plate (1), steel cap anchor bolts (2), and steel cap sleeve (3). The steel cap base plate (1) is made of 10mm thick galvanized steel plate, shaped like a cap, with cross-sectional dimensions matching the pile head so that it fits perfectly onto the pile head of the precast pile. The height difference between the cap top and the eaves is 100mm. A steel cap sleeve (3) is reserved on the top according to the position of the anchor bar of the precast pile, and the sleeve is welded to the top. The sleeve wall thickness is 5mm, and the inner diameter of the sleeve D = the diameter of the anchor bar d + 6mm, and it is arranged in the middle of the anchor bar. A hole is opened in the top range corresponding to the inner diameter of the sleeve for inserting the anchor bar of the pile head. The upper surface of the cap eaves (width 300mm) is serrated, which is beneficial for better waterproofing during mechanical interlocking. Two rows of steel cap anchor bolts (2) are evenly arranged along the upper surface of the cap eaves. The anchor bolt diameter is Φ16, with continuous wire, for later installation of nuts.

[0051] (II): Rubber gaskets. The rubber gaskets (5) are 5mm thick and the same size as the base plate cap. A hole is made in the middle of the pile head area, and a small hole is reserved at the corresponding position of the steel cap anchor (2) so that the anchor can pass through. Each pile head requires two rubber gaskets, which are laid on the serrated surface of the base plate and the pressure plate respectively, with the waterproof membrane sandwiched in the middle. The serrated cross section can effectively increase the contact area, and the rubber gaskets can ensure the airtightness of the contact surface, thereby achieving a good waterproof effect.

[0052] (III): Pressure Plate. The steel cap pressure plate (6) is made of 10mm thick galvanized steel plate, the same size as the cap of the bottom plate, with a hole in the middle of the pile head area, and a small hole reserved at the corresponding position of the steel cap anchor bolt (2). The pressure plate is connected to the bottom plate by tightening the nuts, which creates sufficient pressure on the rubber gasket and waterproof membrane sandwiched in the middle, thus achieving a waterproof effect.

[0053] (iv): Other. Including waterproof membrane (4), steel cap nut (7), pile head waterproof grout (8), and pile head anchor bar (9).

[0054] The present application is applicable to the situation that the pile top elevation is consistent with the design elevation, without the need for cutting or splicing piles. When individual pile heads cannot meet the requirements, traditional methods such as applying waterproof paint can be used for treatment.

[0055] According to the actual engineering, pile head waterproof devices can be pre-fabricated in the factory according to different parameters such as pile type and diameter. Before installing the pile cap bottom plate, ensure that the pile head surface is clean and tidy, free of oil stains, dust and other impurities. Smooth or repair the uneven or damaged surface of the pile head. After preparation, the bottom plate is placed on the pile head. See Figure 6 First step schematic diagram.

[0056] Lay the first layer of rubber gasket (5) on the serrated surface of the steel cap bottom plate. The serrated surface effectively increases the contact area, and the rubber gasket can provide better sealing effect. The combination of serrations and rubber gaskets perfectly blocks the path of groundwater infiltration, achieving good waterproof effect. See Figure 7 Second step schematic diagram.

[0057] After the bottom plate is installed and the first layer of rubber gasket is laid, the basement area begins to be paved with waterproof coiled material (4). See Figure 8 Waterproof coiled material laying schematic diagram. The waterproof coiled material is laid to the edge of the pile and is pressed on the first layer of rubber gasket, with a minimum overlap distance of 300mm. To prevent displacement of the waterproof coiled material and the rubber gasket, a layer of waterproof glue is applied on the rubber gasket before the waterproof coiled material is laid. (Self-adhesive waterproof coiled material can not be coated with waterproof glue) See Figure 9 Third step schematic diagram.

[0058] Lay another layer of rubber gasket (5) on the waterproof coiled material. The rubber gasket requires the same as the first layer of rubber gasket. The upper and lower layers of rubber gaskets will be tightly clamped around the waterproof coiled material through the action of pressure. See Figure 10 Fourth step schematic diagram.

[0059] After the second layer of rubber gasket is installed, the steel cap pressing plate (6) can be installed. The lower surface of the steel cap pressing plate is also serrated and completely engages with the serrations on the upper surface of the bottom plate. See Figure 11 Fifth step schematic diagram.

[0060] Next is the installation of the steel cap nut (7). One steel cap nut is installed on each steel cap bolt (2), and the tightness of the nut directly affects the waterproof effect. Through laboratory testing, the minimum pressure value and the torque value of the nut that can play a waterproof role are obtained. When installing the nut, a torque wrench can be used to ensure that there is enough pressure between the pressure plate and the bottom plate to ensure that the waterproof effect is achieved. After the nut is tightened in place, spot welding is performed in a timely manner to prevent loosening later. The installation sequence of the nut should follow the inside-out, symmetrical installation. The four corners of the nut are fully coated with cement-based penetrating crystalline waterproof coating. See Figure 12 Sixth step schematic diagram.

[0061] Finally, the anchor bar is installed at the pile head. The anchor bar is inserted through the reserved steel cap sleeve (3) and fixed to the pile head by the end thread. At present, the waterproofing membrane and the pile cap have formed a closed whole, and the only remaining gap that may cause water leakage is the gap between the anchor bar and the sleeve. The gap is filled with waterproof grouting material (8). See Figure 13 Seventh step schematic diagram. After this step is completed, all possible water seepage sites have been effectively treated, effectively building the first line of defense for underground engineering waterproofing.

[0062] In this embodiment, the steel cap pile head waterproofing device solves the problems of poor laying of waterproofing membranes at the pile head, excessive joints, and large gaps between the pile head and the like, effectively playing a waterproofing role.

[0063] In summary, the construction method of the parameterized steel cap pile head waterproofing device forms a whole with the waterproofing membrane through mechanical engagement and covers the entire pile head. This makes the first waterproofing measure completely closed, solving the problem of water leakage from the source and eliminating the impact of imperfect waterproofing at the pile head on the building.

[0064] It should be noted that, in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or device.

[0065] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method of parameterizing a steel cap pile head waterproof device, characterized in that: The specific operation is as follows: First step: according to the actual project, the pile head waterproof device matched with the different parameters of pile type and diameter is prefabricated in the factory. Before installing the pile cap bottom plate, the surface of the pile head should be clean and tidy, without oil stains, dust and impurities. The uneven or damaged surface of the pile head should be polished and repaired. After preparation, the bottom plate is sleeved on the pile head; Second step: the first layer of rubber gasket (5) is laid on the serrated surface of the brim area of the steel cap bottom plate. The serrated surface effectively increases the contact area, and the rubber gasket provides better sealing effect. The combination of serrated surface and rubber gasket perfectly blocks the path of groundwater infiltration, achieving good waterproof effect; Third step: after the installation of the bottom plate and the laying of the first layer of rubber gasket, the waterproof coiled material (4) is laid in the basement range. The waterproof coiled material is laid to the edge of the pile and is pressed on the first layer of rubber gasket. The minimum overlap distance between the waterproof coiled material and the rubber gasket is 300mm. To prevent displacement of the waterproof coiled material and the rubber gasket, a layer of waterproof glue is applied on the rubber gasket before laying the waterproof coiled material; Fourth step: a layer of rubber gasket (5) is laid on the waterproof coiled material. The rubber gasket requires the same as the first layer of rubber gasket. The upper and lower layers of rubber gasket tightly clamp the waterproof coiled material in the middle through the action of pressure; Fifth step: after the installation of the second layer of rubber gasket, the steel cap pressing plate (6) is installed. The lower surface of the steel cap pressing plate is also serrated and completely engages with the serrated surface of the upper surface of the bottom plate; Sixth step: the next step is to install the steel cap nut (7). One steel cap nut is installed on each steel cap bolt (2). The tightness of the nut directly affects the waterproof effect. Through laboratory testing, the minimum pressure value and the torque value of the nut that can achieve waterproof effect are obtained. When installing the nut, a torque wrench is used to ensure that there is enough pressure between the pressing plate and the bottom plate to ensure waterproof effect. After the nut is tightened, it is fixed in time to prevent loosening in the later period. The installation sequence of the nut should follow the inside-out and symmetrical installation. The nut is fully coated with cement-based permeable crystalline waterproof coating around it; Seventh step: finally, the pile head anchor bar is installed. The anchor bar is inserted through the reserved steel cap sleeve (3) and fixed on the pile head of the engineering pile by the end thread. At present, the waterproof coiled material and the pile cap have formed a closed whole. The only remaining gap that may cause leakage is the gap between the anchor bar and the sleeve. Waterproof grouting material (8) is used to fill and compact the gap; The steel cap bolt (2) and the steel cap sleeve (3) should be welded on the steel cap bottom plate (1) in advance. The waterproof coiled material (4), the rubber gasket (5), and the steel cap pressing plate (6) should be circularly drilled according to the corresponding positions of the steel cap bolt. The hole can pass through the steel cap bolt.

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