Plugging structure of dewatering well

Abstract

The utility model provides a dewatering well plugging structure, which relates to the technical field of building construction and comprises a double-layer reinforcement cage sleeved in a dewatering well, the double-layer reinforcement cage comprises a reinforcement cage body and a rectangular support frame, the upper end of the reinforcement cage body is connected with the rectangular support frame, a first steel pipe is sleeved on the inner side of the reinforcement cage body, and a second steel pipe is sleeved on the inner side of the first steel pipe. An outer water stop ring is welded to the outer side of the rectangular supporting frame to form a first sealing structure; the partition plate is welded to the inner side of the rectangular supporting frame and covers the first steel pipe to form a second sealing structure, the rectangular supporting frame is filled with a second water stop strip, so that a third sealing structure is formed at the joint, and the multiple sealing structures can ensure the plugging and waterproof closing effects of the joint of the dewatering well and the foundation bottom plate in the later period.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of building construction, in particular to a dewatering well plugging structure. BACKGROUND

[0002] With the development of city construction, the depth of building basement is increasing, so the foundation pit formed by excavation is deeper and deeper when building construction is carried out. In order to make the foundation pit excavation and foundation construction proceed smoothly, the underground water level needs to be lowered to the position below the construction operation surface. In addition, in order to prevent slope collapse and gushing and ensure dry construction environment during deep foundation pit construction, the underground water level also needs to be lowered below the slope surface and pit bottom. Therefore, a dewatering well needs to be set in the foundation pit of the construction site before earthwork excavation to carry out dewatering. In order to ensure that the environment in the foundation pit is dry during the construction of the basement, the above-mentioned dewatering well needs to be continuously set until the completion of the basement structure construction, or even longer. This requires that part of the dewatering well cannot be closed during the construction of the foundation slab, and waterproof construction needs to be carried out at the connection between the part of the dewatering well and the foundation slab, and it is also necessary to ensure that the dewatering well can be smoothly plugged to achieve the effect of waterproof closure.

[0003] In the related art, the dewatering well includes a steel pipe for being inserted into the foundation soil layer, and a circle of water stop steel plates is welded at the position where the upper part of the steel pipe is connected with the foundation slab, and the water stop steel plates are embedded into the inside of the foundation slab. However, since the above-mentioned welding process is manually operated, it is impossible to ensure that the welding seam is dense.

[0004] In the related art, there is a problem of poor water stop effect at the connection between the dewatering well and the foundation slab, which may cause the underground water to seep upward above the foundation slab. UTILITY MODEL CONTENTS

[0005] In order to overcome the waterproof treatment problem at the connection between the dewatering well and the foundation slab in the foundation pit, the utility model provides a dewatering well plugging structure, which forms a support structure by connecting the upper end of the steel reinforcement cage body with the rectangular support frame, welds the partition plate and the outer water stop ring on the inner and outer sides of the rectangular support frame respectively, and fills the water stop strip in the inside of the rectangular support frame, so as to form a multiple sealing structure for the wellhead of the dewatering well, which can ensure that the well is sealed with water under the condition of high underground water level, strong water outflow and large water pressure, and ensure the plugging and waterproof closure effect at the connection between the dewatering well and the foundation slab in the later period.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A dewatering well plugging structure, comprising: a double-layer steel reinforcement cage, a steel reinforcement cage body, a filter interlayer, a first steel pipe, a rectangular support frame, an outer water stop ring, a partition plate, a grouting pipe, a slurry outlet pipe and a sealing layer.

[0008] The double-layer reinforcement cage comprises a reinforcement cage body and a rectangular support frame; the reinforcement cage body is sleeved on the inner wall of the dewatering well and is provided with a filter interlayer; the upper end of the reinforcement cage body is connected with the rectangular support frame; the filter interlayer is filled with filter medium; and the rectangular support frame is filled with a second waterstop strip.

[0009] The first steel pipe is sleeved on the inner side of the reinforcement cage body, and the upper end of the first steel pipe is flush with the upper end of the reinforcement cage body;

[0010] The outer waterstop ring is welded on the outer side of the rectangular support frame, and the partition plate is welded on the inner side of the rectangular support frame, covering the upper end of the first steel pipe;

[0011] The grouting pipe is arranged on the partition plate and is connected with the inside of the first steel pipe, and is used for drawing water collected in the first steel pipe by connecting a water pump, and is also used for filling the first steel pipe with concrete in the second concrete layer after dewatering is completed, so as to backfill and block the first steel pipe;

[0012] The grouting pipe is arranged on the partition plate and is connected with the inside of the first steel pipe;

[0013] The upper side of the partition plate and the outer waterstop ring forms a closed layer.

[0014] Optionally, the reinforcement cage body comprises an inner reinforcement frame and an outer reinforcement frame, the outer reinforcement frame is close to the inner wall of the dewatering well, the inner reinforcement frame is located on the inner side of the outer reinforcement frame, and the inner reinforcement frame and the outer reinforcement frame are arranged in an interlaced and spaced manner along the axial direction of the first steel pipe and form the filter interlayer.

[0015] Optionally, the filter medium comprises goose pebbles with a diameter of 100-300 mm.

[0016] Optionally, the rectangular support frame comprises a first rectangular support frame and a second rectangular support frame; the first rectangular support frame is formed by extending the extension part at the upper end of the inner reinforcement frame to the outer side of the reinforcement cage body; and the second rectangular support frame is formed by extending the extension part at the upper end of the outer reinforcement frame to the inner side of the reinforcement cage body.

[0017] Optionally, the first rectangular support frame comprises a first convex structure and a first extension part; the first extension part extends away from the first steel pipe, and the end of the first extension part exceeds the outer side wall of the reinforcement cage body;

[0018] The second rectangular support frame comprises a second convex structure and a second extension part; the second extension part extends towards the first steel pipe, and the end of the second extension part exceeds the inner side wall of the first steel pipe;

[0019] The first convex structure and the second convex structure are located on the same axis and constitute a ring-shaped steel reinforcement water stop frame, and the steel reinforcement water stop frame is filled with a second water stop strip.

[0020] Optionally, a second steel pipe is sleeved on the outer side wall of the steel reinforcement water stop frame, and a bottom end surface of the second steel pipe is welded to an upper surface of the outer water stop ring; a first water stop strip is arranged at a connection between the second steel pipe and the outer water stop ring.

[0021] Optionally, one end of the grout outlet pipe in communication with the inside of the first steel pipe is provided with a water level sensor, and the water level sensor is electrically connected to the water pump.

[0022] Optionally, the grouting pipe and the grout outlet pipe are respectively provided with a first pipe water stop ring and a second pipe water stop ring on the outer wall of the inner side pipe section of the second steel pipe and spaced apart in the axial direction.

[0023] Optionally, after backfilling and plugging of the first steel pipe, the grouting pipe and the grout outlet pipe are cut off at the part outside the dewatering well and into the second steel pipe, and a first cover plate and a second cover plate are respectively welded at the openings, and a sealing plate is welded to the upper end of the second steel pipe, the first cover plate and the second cover plate.

[0024] Optionally, the sealing layer comprises an inner waterproof layer, an outer waterproof layer, a concrete cushion layer, a first concrete layer and a second concrete layer; the second concrete layer is concrete with an expansion rate greater than a first preset threshold value and less than a second preset threshold value.

[0025] The concrete cushion layer is laid from the top side of the partition plate and the outer water stop ring to the upper end of the steel reinforcement water stop frame.

[0026] The inner waterproof layer and the second concrete layer are sequentially laid from bottom to top on the top side of the concrete cushion layer and the inner side of the second steel pipe, and the second concrete layer is laid to the upper end of the second steel pipe.

[0027] The outer waterproof layer and the first concrete layer are sequentially laid from bottom to top on the top side of the concrete cushion layer and the outer side of the second steel pipe, the outer waterproof layer is laid to the height of the inner waterproof layer, and the first concrete layer is laid to the upper end of the second steel pipe.

[0028] Compared with the related art, the present application has at least the following beneficial effects:

[0029] 1. The utility model provides a precipitation well plugging structure, double -layer reinforcement cage is equipped in the precipitation well, double -layer reinforcement cage includes reinforcement cage body and rectangular support frame, and the upper end of reinforcement cage body is connected with rectangular support frame, and the first steel pipe is equipped in the inside of reinforcement cage body, and the outside of rectangular support frame is welded through the outer water stop ring and forms the first sealing structure, the baffle is welded in the inside of rectangular support frame and covers the upper end of first steel pipe and forms the second sealing structure, and the rectangular support frame is filled with second water stop strip, thereby forms the third sealing structure at the connecting place, and multiple sealing structures can guarantee the water sealing well under the condition of higher underground water level, more water, and larger water pressure, ensure the plugging and waterproof closing effect of the connecting place of precipitation well and foundation base plate in later period.

[0030] 2. The utility model provides a precipitation well plugging structure, through the water pump, the water gathered in the first steel pipe is extracted through the grouting pipe, can effectively reduce the underground water level of local area, simultaneously, the closed layer is formed on the upper side of outer water stop ring and baffle in the process that grouting pipe continuously pumps water, after closing is completed, the grouting pipe can be converted into grouting pipeline, and the first steel pipe is backfilled and plugged by injecting the concrete in the second concrete layer into the first steel pipe through the grouting pipe, solve the precipitation well rapid closing waterproof problem after the end of precipitation project.

[0031] 3. The utility model discloses the upper end of reinforcement cage body is connected with rectangular support frame and forms the support structure, can guarantee the water sealing well under the condition of higher underground water level, more water, and larger water pressure, guarantee sealing well quality, still have the reinforcement effect to surrounding soil body. ACCURACY

[0032] The drawings constituting a part of the utility model are used to provide further understanding on the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model.In the drawings:

[0033] Figure 1 It is the structure schematic drawing of the utility model precipitation well plugging structure in the unsealed well state;

[0034] Figure 2 It is the structure schematic drawing of the utility model precipitation well plugging structure in the sealed well state; Figure 1 It is the enlarged structure schematic drawing of mark A in

[0035] Figure 3 It is the structure schematic drawing of the utility model precipitation well plugging structure in the unsealed well state;

[0036] Figure 4 It is the structure schematic drawing of the utility model precipitation well plugging structure in the sealed well state; Figure 3 It is the enlarged structure schematic drawing of mark B in

[0037] Figure 5 It is the structure schematic drawing of double -layer reinforcement cage;

[0038] Figure 6 is a structural diagram of a rectangular support frame.

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] 1 - foundation pit, 2 - double-layer reinforcement cage, 200 - reinforcement cage body, 3 - pebbles, 300 - filter interlayer, 5 - first steel pipe, 6 - second rectangular support frame, 61 - second convex structure, 62 - second extension, 7 - reinforcement water stop frame, 8 - first rectangular support frame, 81 - first convex structure, 82 - first extension, 9 - outer water stop ring, 10 - first water stop strip, 11 - second steel pipe, 12 - water pump, 13 - grouting pipe, 14 - grout outlet pipe, 15 - second water stop strip, 16 - partition plate, 17 - water level sensor, 18 - second concrete layer, 19 - sealing plate, 20 - first cover plate, 21 - second cover plate, 22 - inner waterproof layer, 23 - outer waterproof layer, 24 - concrete cushion layer, 25 - first pipeline water stop ring, 26 - second pipeline water stop ring, 27 - inner reinforcement frame, 28 - outer reinforcement frame, 29 - first concrete layer, 30 - rectangular support frame, 32 - sealing layer. DETAILED DESCRIPTION

[0041] 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 skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] The terms "first", "second", and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0043] It should be understood that "some embodiments" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0044] The utility model provides a kind of precipitation well plugging structure, which is described in detail below by listing specific examples.

[0045] When the precipitation well reaches the confined aquifer, it is accompanied by high water head confined water. The sealing of the precipitation well is difficult due to the large diameter of the precipitation well, high water level, and rapid water gushing speed. To avoid the above-mentioned problems that may occur during the sealing process and ensure the sealing quality, reference is made to Figures 1-4 The precipitation well in the foundation pit 1 is provided with the precipitation well plugging structure, which includes a double-layer reinforcement cage 2, a reinforcement cage body 200, a filter interlayer 300, a first steel pipe 5, a rectangular support frame 30, an outer water stop ring 9, a partition plate 16, a grouting pipe 13, a slurry outlet pipe 14, and a closed layer 32. The double-layer reinforcement cage 2 includes the reinforcement cage body 200 and the rectangular support frame 30. The reinforcement cage body 200 is sleeved on the inner wall of the precipitation well and is provided with the filter interlayer 300. The upper end of the reinforcement cage body 200 is connected with the rectangular support frame 30. The filter interlayer 300 is filled with a filter medium. The rectangular support frame 30 is filled with a second water stop strip 15. The first steel pipe 5 is sleeved on the inner side of the reinforcement cage body 200, and the upper end of the first steel pipe 5 is flush with the upper end of the reinforcement cage body 200. The outer water stop ring 9 is welded on the outer side of the rectangular support frame 30. The partition plate 16 is welded on the inner side of the rectangular support frame 30, and covers the upper end of the first steel pipe 5. The grouting pipe 13 is arranged on the partition plate 16 and communicates with the inside of the first steel pipe 5. The grouting pipe 13 is used to extract the water collected in the first steel pipe 5 by connecting a water pump 12, and is also used to fill the concrete in the second concrete layer 18 into the inside of the first steel pipe 5 after the precipitation is completed, so as to backfill and seal the first steel pipe 5. The slurry outlet pipe 14 is arranged on the partition plate 16 and communicates with the inside of the first steel pipe 5. The upper side of the partition plate 16 and the outer water stop ring 9 forms the closed layer 32.

[0046] It should be noted that the above-mentioned double-layer reinforcement cage 2 is cylindrical, which is convenient to uniformly distribute in the precipitation well, provides good structural reinforcement, and ensures stability. Of course, the double-layer reinforcement cage 2 can also be other shapes, such as square, polygon, etc., that is, it needs to meet the shape of the double-layer reinforcement cage 2 and the shape of the precipitation well, to meet the specific application and specific mechanical and construction requirements, and the present application does not limit it.

[0047] In practical applications, the first steel pipe 5 has a certain number of appropriately sized holes on its wall surface. The holes can be positioned such that 0.5–1 m is left un-holed from the upper end of the first steel pipe 5 to prevent surface sewage from flowing into it; 0.3–0.5 m is left un-holed from the bottom of the first steel pipe 5 to avoid excessive siltation; and holes can be reasonably arranged on the remaining parts of the wall surface of the first steel pipe 5. The hole diameter can be 10–50 mm, for example: 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc. Too small a diameter will result in insufficient water inflow, affecting the precipitation effect; too large a diameter may allow more silt and other impurities to enter the first steel pipe 5 with the water flow, easily causing blockage. The longitudinal spacing of the holes (i.e., along...) Figure 2 The spacing along the Y-axis can be 0.3–1 m, for example: 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, 0.8 m, 0.9 m, 1 m, etc. The circumferential spacing of the holes can be evenly distributed according to the circumference of the first steel pipe 5, and can be 0.1–0.5 m, for example: 0.1 m, 0.2 m, 0.3 m, 0.4 m, 0.5 m, etc. The holes facilitate the smooth flow of groundwater into the first steel pipe 5, which can then be pumped out by the water pump to lower the water level. The outer wall of the first steel pipe 5 is also covered with a nylon filter screen to filter impurities in the water. Other filter materials can also be used, such as polyester fiber filter cloth, glass fiber filter screen, stainless steel filter screen, etc. The embodiments of this application do not limit the specific materials used.

[0048] It should be noted that the upper end of the steel cage body 200 is connected to the rectangular support frame 30. The connection method here can be welding, binding, or snap-fit ​​connection. This application embodiment does not limit this.

[0049] It should be noted that the grouting pipe 13 and the grout outlet pipe 14 are disposed on the partition plate 16. The grouting pipe 13 and the grout outlet pipe 14 can be located on the partition plate 16 at intervals. The grouting pipe 13 and the grout outlet pipe 14 and the partition plate 16 can be integral or tightly connected. This application embodiment does not limit this.

[0050] It can be understood that the rectangular support frame 30 is filled with the second water stop 15, wherein the second water stop is a water-swelling water stop, which can be a rubber water stop, a bentonite water stop or the like. The rubber water stop contains hydrophilic functional groups. When water is contacted, water molecules will hydrate with the hydrophilic functional groups, and the water molecules are combined with the functional groups through hydrogen bonds and other forces, so that the distance between the rubber molecular chains is increased, and the rubber water stop is macroscopically expanded in volume. The bentonite water stop has a layered crystal structure, and the layers are connected through weak ionic bonds or intermolecular forces. When water is encountered, water molecules can enter the interlayer, destroy the original balance state, and increase the layer spacing. The entry of a large number of water molecules causes the overall volume of the bentonite to rapidly expand, and the expansion is isotropic, which can fill the gap in all directions to achieve the purpose of water stop. The embodiments of the present application are not limited thereto.

[0051] It should be further pointed out that the distance from the grouting pipe 13 away from the partition plate 16 to the one end of the first steel pipe 5 can be 30-150 mm. The grouting pipe 13 away from the partition plate 16 is away from the one end of the first steel pipe 5 and draws the water collected in the first steel pipe 5 through the water pump 12. The distance from the grouting pipe 14 away from the partition plate 16 to the one end of the first steel pipe 5 can be 10-80 mm. The grouting pipe 14 away from the partition plate 16 is away from the other end of the first steel pipe 5 and is in communication with the atmosphere, so as to avoid the vacuum phenomenon in the first steel pipe 5. The embodiments of the present application are not limited thereto.

[0052] In actual application, in order to achieve the purpose of faster construction, the manufacturing process of the double-layer reinforcement cage 2 and the pre-assembly of the first steel pipe 5 can be carried out in a factory, and then the double-layer reinforcement cage 2 can be directly hoisted into the dewatering well after arriving at the site, and the dewatering process is started. The embodiments of the present application are not limited thereto.

[0053] In the embodiments of the present application, the filter interlayer 300 is arranged in the reinforcement cage body 200, and the filter medium is filled in the filter interlayer 300, so as to preliminarily filter the underground water flowing into the first steel pipe 5. The outer water stop ring 9 is welded to the outer side of the rectangular support frame 30 to form the first sealing structure, so as to avoid the water in the dewatering well from seeping along the wall surface of the double-layer reinforcement cage. The partition plate 16 is welded to the inner side of the rectangular support frame 30 and covers the upper end of the first steel pipe 5 to form the second sealing structure. The rectangular support frame 30 is filled with the second water stop 15, so as to form the third sealing structure at the connection. The multiple sealing structures can ensure the water sealing in the case of high underground water level, abundant water outflow and large water pressure, and ensure the sealing and waterproof closing effect of the connection between the dewatering well and the foundation slab in the later period.

[0054] In the embodiment of the present application, the grouting pipe 13 is used to draw water collected in the first steel pipe 5 by connecting the water pump 12 to effectively reduce the groundwater level in the local area. During the continuous water pumping process of the grouting pipe 13, the upper side of the partition plate 16 and the outer water stop ring 9 forms a closed layer 32. After the closure is completed, the grouting pipe 13 can be converted into a grouting pipe to fill the concrete in the second concrete layer 18 into the first steel pipe 5 to backfill and block the first steel pipe 5. The problem of rapid closure and waterproofing of the dewatering well after the dewatering project is completed is solved.

[0055] In the embodiment of the present application, the support structure is formed by connecting the upper end of the reinforcement cage body 200 with the rectangular support frame 30, which can ensure that the well sealing is carried out with water under the condition of high underground water level, strong water outflow and large water pressure, and ensure the well sealing quality. It also has the effect of reinforcing the surrounding soil.

[0056] Optionally, in another embodiment, referring to Figure 2 and Figure 5 , the reinforcement cage body 200 includes an inner reinforcement frame 27 and an outer reinforcement frame 28. The outer reinforcement frame 28 is close to the inner wall surface of the dewatering well, and the inner reinforcement frame 27 is located on the inner side of the outer reinforcement frame 28. The inner reinforcement frame 27 and the outer reinforcement frame 28 are arranged in a staggered and spaced manner along the axial direction of the first steel pipe 5 and form a filter interlayer 300.

[0057] It should be noted that the axial direction of the first steel pipe 5 is the Y-axis direction shown in Figure 2 , wherein the radial direction and the axial direction represented by the X-axis and the Y-axis are both referred to the radial direction and the axial direction of the first steel pipe 5.

[0058] It should be noted that the filter interlayer 300 is a space surrounded by the inner reinforcement frame 27 and the outer reinforcement frame 28 in the reinforcement cage body 200. The filter interlayer 300 has the same shape as the reinforcement cage body 200 described above, which can be cylindrical. Of course, it can also be other shapes, such as square, polygon, etc. The shape of the filter interlayer 300 and the reinforcement cage body 200 is adapted to the shape of the dewatering well, which is not limited in the embodiment of the present application.

[0059] In the embodiment of the present application, the inner reinforcement frame 27 and the outer reinforcement frame 28 of the reinforcement cage body 200 are arranged in a staggered and spaced manner along the axial direction of the first steel pipe 5. On the one hand, it can improve the stability of the well wall of the dewatering well, effectively prevent the well wall from collapsing, deforming and other problems, and ensure that the overall structure of the dewatering well remains stable during the construction process and subsequent long-term use. On the other hand, it can enhance the overall bearing capacity, withstand additional external forces such as construction vibration, slight ground movement and other external forces, and ensure that the dewatering well can continuously and normally play its function of collecting and pumping underground water, and will not fail due to structural damage. The filter interlayer 300 is formed by the inner reinforcement frame 27 and the outer reinforcement frame 28. The filter interlayer 300 is filled with filter medium, which can preliminarily filter the underground water flowing into the first steel pipe 5.

[0060] Optionally, in another embodiment, referring to Figure 1 , the filtering medium comprises the pebbles 3 with a diameter of 100-300mm.

[0061] It should be noted that the filtering medium can be quartz sand, gravel, etc. in addition to the pebbles, and the embodiments of the present application do not limit this.

[0062] It should be further noted that the diameter of the pebbles is 100-300mm, and specifically, the diameter can be 100mm, 150mm, 200mm, 250mm, 300mm, etc. The specific selection needs to be determined according to the specific situation of the precipitation well, and the embodiments of the present application do not limit this.

[0063] In the embodiments of the present application, the pebbles 3 filled in the filtering interlayer 300 can intercept and filter the larger particle impurities such as silt and small stones carried in the water when the water seeps from the stratum into the precipitation well, thereby playing a role of preliminary filtration and avoiding the impurities from directly entering the inside of the precipitation well. The filled pebbles can also play a certain supporting role on the well wall, can disperse the lateral pressure from the stratum around the well wall, help to maintain the stability of the well wall, prevent the well wall from collapsing, deforming, etc. due to external pressure, and ensure the structural integrity and safety of the precipitation well.

[0064] Optionally, in another embodiment, referring to Figure 2 , Figure 5 and Figure 6 , the rectangular support frame 30 comprises: a first rectangular support frame 8 and a second rectangular support frame 6; the first rectangular support frame 8 is formed by extending the extension part of the upper end of the inner steel bar frame 27 to the outside of the steel reinforcement cage body 200; and the second rectangular support frame 6 is formed by extending the extension part of the upper end of the outer steel bar frame 28 to the inside of the steel reinforcement cage body 200.

[0065] It should be noted that the extension part of the upper end of the inner steel bar frame 27 can form an inner longitudinal bar, and the extension part of the upper end of the outer steel bar frame 28 can form an outer longitudinal bar. The inner longitudinal bar and the outer longitudinal bar are at least reserved to exceed the upper end part 500-800mm of the steel reinforcement cage body 200, and the embodiments of the present application do not limit this.

[0066] It should be noted that the first rectangular support frame 8 can be formed by bending the inner longitudinal bar outward along the radial direction (i.e. the X-axis direction) of the steel reinforcement cage body 200. The second rectangular support frame 6 can be formed by bending the outer longitudinal bar inward along the radial direction of the steel reinforcement cage body 200, and the embodiments of the present application do not limit this.

[0067] It should be noted that the outer water stop ring 9 can be welded on the outer side of the first rectangular support frame 8, and the partition plate 16 can be welded on the inner side of the second rectangular support frame 6.

[0068] In the embodiments of the present application, the first sealing structure is formed by welding the outer water stop ring 9 on the outer side of the first rectangular support frame 8, which can prevent water in the dewatering well from seeping along the wall of the double-layer reinforcement cage 2; the second sealing structure is formed by welding the partition plate 16 on the inner side of the second rectangular support frame 6 and covering the first steel pipe 5 with the partition plate 16; the second water stop strip 15 is filled in the rectangular support frame 30, and the second water stop strip 15 will expand when encountering water. The expanded second water stop strip 15 can fill the gap in the rectangular support frame 30, thereby forming the third sealing structure at the connection, and the multiple sealing structures can ensure that the dewatering well is sealed with water in the case of high underground water level, high water yield and high water pressure, and ensure the sealing and waterproof closing effect of the connection between the dewatering well and the foundation slab in the later period.

[0069] Optionally, in another embodiment, referring to Figure 5 and Figure 6 , the first rectangular support frame 8 comprises a first convex structure 81 and a first extension 82; the first extension 82 extends away from the first steel pipe 5, and the end of the first extension 82 exceeds the outer side wall of the reinforcement cage body 200; the second rectangular support frame 6 comprises a second convex structure 61 and a second extension 62; the second extension 62 extends towards the first steel pipe 5, and the end of the second extension 62 exceeds the inner side wall of the first steel pipe 5; the first convex structure 81 and the second convex structure 61 are located on the same axis and constitute a ring-shaped reinforcement water stop frame 7, and the reinforcement water stop frame 7 is filled with the second water stop strip 15.

[0070] Specifically, the inner longitudinal reinforcement is bent outward along the radial direction of the first steel pipe 5 to form the first convex structure 81, and the horizontal reinforcement away from the center of the first steel pipe 5 forms the first extension 82. The outer longitudinal reinforcement is bent inward along the radial direction of the first steel pipe 5 to form the second convex structure 61, and the horizontal reinforcement towards the center of the first steel pipe 5 forms the second extension 62.

[0071] It should be noted that the rectangular cavity formed by the first convex structure 81 and the second convex structure 61 can constitute the reinforcement water stop frame 7, and the second water stop strip 15 is filled in the rectangular cavity. The second water stop strip 15 is a water-expanding water stop strip, which is the same as the water-expanding water stop strip in the rectangular support frame 30 described above, and will not be described here to avoid repetition.

[0072] It should be noted that the first rectangular support frame 8 or the second rectangular support frame 6 is integrally formed with the reinforcement water stop frame 7 at the upper end of the reinforcement cage body 200.

[0073] It can be understood that the steel reinforcement water stop frame 7 is located between the outer water stop ring 9 and the partition plate 16, and plays a connecting and supporting role. On the one hand, the steel reinforcement water stop frame 7 connects the outer water stop ring 9 and the partition plate 16, so that there is a stable structural support between the outer water stop ring 9 and the partition plate 16, thereby enhancing the integrity and stability of the entire sealing structure. On the other hand, the steel reinforcement water stop frame 7 provides a filling space for the second water stop strip 15, and cooperates with the second water stop strip 15 to form a sealing structure.

[0074] It should be noted that the first extension part 82 and the second extension part 62 can be strip-shaped or circular, and the embodiments of the present application do not limit them.

[0075] In actual application, the outer water stop ring 9 can be welded to the first extension part 82, and the partition plate 16 can be welded to the second extension part 62. Specifically, the partition plate 16 is welded to the end of the second extension part 62 near the two ends of the first steel pipe 5, and the remaining part of the partition plate 16 covers the first steel pipe 5.

[0076] In the embodiments of the present application, the outer water stop ring 9 can be welded to the first extension part 82 to form the first sealing structure, which can prevent water in the dewatering well from seeping along the wall surface of the double-layer reinforcement cage 2; the partition plate 16 can be welded to the second extension part 62 and the partition plate 16 covers the first steel pipe 5 to form the second sealing structure; the steel reinforcement water stop frame 7 is a rectangular cavity formed by the first convex structure 81 and the second convex structure 82, and is located between the outer water stop ring 9 and the partition plate 16. The steel reinforcement water stop frame 7 is filled with the second water stop strip 15, which will swell when encountering water. The swollen second water stop strip 15 can fill the gaps in the steel reinforcement water stop frame 7 and the tiny gaps at the contact positions of the outer water stop ring 9 and the partition plate 16, thereby preventing water from seeping, forming the third sealing structure at the connection position. In addition, the first rectangular support frame 8 or the second rectangular support frame 6 is integrally formed with the steel reinforcement water stop frame 7 at the upper end of the reinforcement cage body 200. The integrally formed structure does not have the problem of loose connection between parts, and as a complete structure, it can more effectively cooperate with the force, so that the multiple sealing structures can ensure the water sealing of the dewatering well in the case of high underground water level, high water yield and large water pressure, and ensure the sealing and waterproof closing effect of the connection between the dewatering well and the foundation bottom plate in the later period.

[0077] Optionally, in another embodiment, referring to Figure 2 and Figure 4 , the second steel pipe 11 is sleeved on the outer side wall surface of the steel reinforcement water stop frame 7, and the bottom end surface of the second steel pipe 11 is welded to the upper surface of the outer water stop ring 9. The connection position of the second steel pipe 11 and the outer water stop ring 9 is provided with the first water stop strip 10.

[0078] It should be noted that the wall surface of the second steel pipe 11 is not provided with a hole, and the second steel pipe mainly plays a protection role, such as preventing the surrounding soil layer from collapsing, stabilizing the well wall structure, etc.

[0079] It should be noted that the connection between the second steel pipe 11 and the outer water stop ring 9 is provided with a first water stop strip 10, wherein the first water stop strip 10 is a water-swelling water stop strip, which is the same as the water-swelling water stop strip in the rectangular support frame 30 described above, and details are not repeated here to avoid repetition.

[0080] In the embodiment of the application, since the first water stop strip 10 is a water-swelling water stop strip, the expanded first water stop strip 10 can fill the gap at the connection between the second steel pipe 11 and the outer water stop ring 9, thereby preventing water leakage.

[0081] Optionally, in another embodiment, referring to Figure 2 , the end of the grouting pipe 14 in communication with the inside of the first steel pipe 5 is provided with a water level sensor 17, and the water level sensor 17 is electrically connected with the water pump 12.

[0082] In the embodiment of the application, when the water level sensor 17 detects that the water level in the first steel pipe 5 reaches an alarm value, a start signal is sent to the water pump 12, so that the water pump 12 can automatically pump water in the dewatering well.

[0083] Optionally, in another embodiment, referring to Figure 2 and Figure 4 , the first pipe water stop ring 25 and the second pipe water stop ring 26 are respectively arranged on the outer wall of the inner side pipe section of the second steel pipe 11 and are spaced apart along the axial direction.

[0084] It should be noted that the above axial spacing is along the axial direction of the second steel pipe 11, that is, Figure 2 and Figure 4 are spaced apart along the Y-axis direction, wherein the X-axis and the Y-axis represent the radial direction and the axial direction, which are referred to the radial direction and the axial direction of the second steel pipe 11.

[0085] It should be noted that the first pipe water stop ring 25 is buried in the inner waterproof layer 22, and the second pipe water stop ring 26 is buried in the concrete cushion layer 24.

[0086] In the embodiment of the application, the first pipe water stop ring 25 is buried in the inner waterproof layer 22, and the first pipe water stop ring 25 is tightly attached to the grouting pipe 13 and the grout outlet pipe 14, the inner waterproof layer 22, effectively sealing the channel through which groundwater may penetrate along the outer wall of the grouting pipe 13 and the grout outlet pipe 14, and the second pipe water stop ring 26 is buried in the concrete cushion layer 24, which can prevent water in the dewatering well from seeping out along the gap between the wall surface of the grouting pipe 13 and the grout outlet pipe 14 and the partition plate 16.

[0087] Optionally, in another embodiment, referring to Figure 4 After the first steel pipe 5 is backfilled and blocked, the portions of the grouting pipe 13 and the slurry outlet pipe 14 outside the dewatering well are cut off into the second steel pipe 11, and the first cover plate 20 and the second cover plate 21 are welded at the openings, respectively. The upper ends of the second steel pipe 11, the first cover plate 20 and the second cover plate 21 are welded with the sealing plate 19.

[0088] It should be noted that the portions of the grouting pipe 13 and the slurry outlet pipe 14 outside the dewatering well are cut off into the second steel pipe 11, wherein the heights of the grouting pipe 13 and the slurry outlet pipe 14 are lower than the height of the second steel pipe 11, so as to facilitate the welding of the cover plates and leave a certain space for the welding of the sealing plate 19 on the cover plates, so that the height of the cover plates after the welding of the sealing plate 19 can be flush with the height of the second steel pipe 11 to enhance the sealing effect in the second steel pipe 11.

[0089] It should be noted that the first cover plate 20, the second cover plate 21 and the sealing plate 19 can be steel cover plates, concrete cover plates, composite material cover plates, etc., which are not limited in the present application.

[0090] In the embodiment of the present application, the first cover plate 20 is welded at the opening of the grouting pipe 13, and the second cover plate 21 is welded at the opening of the slurry outlet pipe 14, which can prevent underground water from seeping along the grouting pipe 13 and the slurry outlet pipe 14; the sealing plate 19 is welded at the upper ends of the second steel pipe 11, the first cover plate 20 and the second cover plate 21, which can effectively prevent underground water from seeping along the grouting pipe 13, the slurry outlet pipe 14 and the second steel pipe 11.

[0091] Optionally, in another embodiment, referring to Figure 3 and Figure 4 The sealing layer 32 includes the inner waterproof layer 22, the outer waterproof layer 23, the concrete cushion layer 24, the first concrete layer 29 and the second concrete layer 18; the second concrete layer (18) is concrete with an expansion rate greater than a first preset threshold and less than a second preset threshold;

[0092] The concrete cushion layer 24 is laid from the upper side of the partition plate 16 and the outer water stop ring 9 to the upper end of the steel reinforcement water stop frame 7.

[0093] The inner waterproof layer 22 and the second concrete layer 18 are laid from the lower side to the upper side of the upper side of the concrete cushion layer 24 and the inner side of the second steel pipe 11, respectively, and the second concrete layer 18 is laid to be flush with the upper end of the second steel pipe 11.

[0094] The outer waterproof layer 23 and the first concrete layer 29 are laid from the lower side to the upper side of the upper side of the concrete cushion layer 24 and the outer side of the second steel pipe 11, respectively, the outer waterproof layer 23 is laid to be flush with the height of the inner waterproof layer 22, and the first concrete layer 29 is laid to be flush with the upper end of the second steel pipe 11.

[0095] It should be noted that the inner waterproof layer 22 and the outer waterproof layer 23 can be rigid waterproof layers such as asphalt waterproof layers, flexible waterproof layers such as plastic waterproof layers, composite waterproof layers combining flexible and rigid waterproof layers, waterproof paint, bentonite waterproof blankets, and the like, which are not limited in the present application.

[0096] It should be noted that the second concrete layer (18) is micro-expansion concrete with an expansion rate greater than a first preset threshold and less than a second preset threshold, and the expansion rate is the limited expansion rate of the concrete in water for 14 days, wherein the first preset threshold is 1.5*10 -4 , and the second preset threshold is 4.0*10 -4 , which is not limited in the present application.

[0097] It should be further noted that the first concrete layer 29 is a base concrete formed by mixing and stirring cement, sand, gravel, water, and the like in a certain proportion without adding an expansion agent, wherein the mass ratio of cement:sand:gravel:water can be 1:2-3:3-5:0.4-0.6, for example, if 300 kg of cement is used, the amount of sand can be 600-900 kg, the amount of gravel can be 900-1500 kg, and the amount of water can be 120-180 kg, which is not limited in the present application.

[0098] In the present application, the concrete cushion 24, the inner waterproof layer 22, the outer waterproof layer 23, the second concrete layer 18, and the first concrete layer 29 are filled in the sealing layer 32. Since groundwater may still attempt to seep in or out through the gaps between the steel reinforcement cage body 200 and the partition plate 16, the laying of the concrete cushion 24 can fill these potential gaps to some extent, reduce the seepage path of groundwater, cooperate with other plugging structures, enhance the water stopping ability of the entire dewatering well plugging structure, and better isolate the exchange of water inside and outside after the dewatering well is plugged, thereby maintaining the stability of the surrounding groundwater level. The inner waterproof layer 22 and the outer waterproof layer 23 can further prevent water from seeping in and prevent water from seeping out of the dewatering well. Since the second concrete layer 18 is micro-expansion concrete, it can effectively reduce the generation of cracks, thereby reducing the channels through which groundwater may seep into or out of the dewatering well. Meanwhile, the micro-expansion concrete and the inner waterproof layer 22 cooperate with each other to further enhance the overall waterproof effect. The first concrete layer 29, i.e., the base concrete, can provide lateral support, tightly combine with the second steel pipe 11 to enhance the overall stability, and at the same time can fill the gaps to reduce leakage.

[0099] Based on the above dewatering well plugging structure, a well plugging and waterproof construction method is also provided, and the specific construction steps are as follows:

[0100] S1. Perform construction of the foundation cushion around the dewatering well;

[0101] S2. Put the double-layer reinforcement cage 2 into the dewatering well, and put the first steel pipe 5 into the double-layer reinforcement cage 2 until the first steel pipe 5 is flush with the upper end of the double-layer reinforcement cage 2, and fill the filter medium pebbles 3 with a diameter of 100-300 mm into the filter interlayer 300 of the double-layer reinforcement cage 2;

[0102] S3. The inner longitudinal reinforcement of the upper end of the double-layer reinforcement cage 2 is bent outward along the radial direction of the reinforcement cage body 200 to form a first rectangular support frame 8, the first rectangular support frame 8 is supported on the surrounding foundation cushion layer of the dewatering well, and the outer side of the first rectangular support frame 8 is welded with an outer water stop ring 9, the inner longitudinal reinforcement is bent inward along the radial direction of the reinforcement cage body 200 to form a second rectangular support frame 6, the inner side of the second rectangular support frame 6 is welded with a partition plate 16, the partition plate 16 is connected with a grouting pipe 13 and a slurry outlet pipe 14 which are in communication with the inside of the first steel pipe 5, a first convex structure 81 of the first rectangular support frame 8 and a second convex structure 61 of the second rectangular support frame 6 constitute an annular steel reinforcement water stop frame 7, and the steel reinforcement water stop frame 7 is filled with a second water stop strip 15;

[0103] S4. The second steel pipe 11 is sleeved on the outer side wall surface of the steel reinforcement water stop frame 7, the bottom end surface of the second steel pipe 11 is welded with the upper surface of the outer water stop ring 9, and a first water stop strip 10 is arranged at the connection between the second steel pipe 11 and the outer water stop ring 9;

[0104] S5. The concrete cushion layer 24 and the waterproof layer are sequentially laid from bottom to top on the upper side of the outer water stop ring 9 and the partition plate 16, and the concrete cushion layer 24 is laid to be flush with the upper end of the steel reinforcement water stop frame 7; the outer waterproof layer 23 is laid on the outer side of the second steel pipe 11, and the inner waterproof layer 22 is laid on the inner side of the second steel pipe 11;

[0105] S6. When the water level in the dewatering well is lowered to the lowest by the grouting pipe 13, the micro-expanding concrete in the second concrete layer 18 is injected into the first steel pipe 5 through the grouting pipe 13, the grouting pipe 13 and the slurry outlet pipe 14 are cut off to the inside of the second steel pipe 11, and the first cover plate 21 and the second cover plate 22 are respectively welded at the openings;

[0106] S7. The second concrete layer 18 is laid on the upper side of the inner waterproof layer 22 inside the second steel pipe 11 until it is flush with the upper end of the second steel pipe 11, then the sealing plate 19 is welded at the upper opening of the second steel pipe 11, and finally the foundation concrete in the first concrete layer 29 is poured on the outer waterproof layer 23 of the space outside the second steel pipe 11, thus the sealing of the dewatering well is completed.

[0107] Finally, it is to be noted that the terms such as first and second, and the like, merely denote different entities or operations, without necessarily requiring or implying any actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0108] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precipitation well plugging structure, characterized by, The utility model relates to a double-layer reinforcement cage for dewatering well, which comprises a double-layer reinforcement cage (2), a reinforcement cage body (200), a filter sandwich (300), a first steel pipe (5), a rectangular support frame (30), an outer water stop ring (9), a partition plate (16), a grouting pipe (13), a slurry outlet pipe (14) and a closed layer (32). The double-layer reinforcement cage (2) comprises the reinforcement cage body (200) and the rectangular support frame (30); the reinforcement cage body (200) is sleeved on the inner wall of the dewatering well and is provided with the filter sandwich (300); the upper end of the reinforcement cage body (200) is connected with the rectangular support frame (30); the filter sandwich (300) is filled with filter medium; the rectangular support frame (30) is filled with a second water stop strip (15). The first steel pipe (5) is sleeved on the inner side of the reinforcement cage body (200), and the upper end of the first steel pipe (5) is flush with the upper end of the reinforcement cage body (200). The outer water stop ring (9) is welded on the outer side of the rectangular support frame (30); the partition plate (16) is welded on the inner side of the rectangular support frame (30), and the partition plate (16) covers the upper end of the first steel pipe (5). The grouting pipe (13) is arranged on the partition plate (16) and communicates with the inside of the first steel pipe (5); the grouting pipe (13) is used for drawing water collected in the first steel pipe (5) through the connected water pump (12), and the grouting pipe (13) is also used for filling the inside of the first steel pipe (5) with concrete in the second concrete layer (18) after the dewatering is completed, so as to backfill and block the first steel pipe (5). The slurry outlet pipe (14) is arranged on the partition plate (16) and communicates with the inside of the first steel pipe (5). The upper side of the partition plate (16) and the outer water stop ring (9) forms the closed layer (32). The reinforcement cage body (200) comprises an inner reinforcement frame (27) and an outer reinforcement frame (28); the outer reinforcement frame (28) is close to the inner wall of the dewatering well, the inner reinforcement frame (27) is located on the inner side of the outer reinforcement frame (28), and the inner reinforcement frame (27) and the outer reinforcement frame (28) are arranged in a staggered manner along the axial direction of the first steel pipe (5) and form the filter sandwich (300).

2. The precipitation well plugging structure according to claim 1, characterized in that, The filter medium comprises goose pebbles (3) with a diameter of 100-300 mm.

3. The precipitation well plugging structure according to claim 1 or 2, characterized in that, The rectangular support frame (30) comprises a first rectangular support frame (8) and a second rectangular support frame (6).

4. The precipitation well plugging structure according to claim 2, characterized in that, The first rectangular support frame (8) is formed by extending the extension part at the upper end of the inner reinforcement frame (27) to the outer side of the reinforcement cage body (200). The second rectangular support frame (6) is formed by extending the extension part at the upper end of the outer reinforcement frame (28) to the inner side of the reinforcement cage body (200). The first rectangular support frame (8) comprises a first convex structure (81) and a first extension part (82); the first extension part (82) extends in a direction away from the first steel pipe (5), and the end of the first extension part (82) is beyond the outer side wall of the reinforcement cage body (200).

5. The precipitation well plugging structure according to claim 4, characterized in that, ​ The second rectangular support frame (6) comprises a second convex structure (61) and a second extension (62); the second extension (62) extends towards the first steel pipe (5), and the end of the second extension (62) exceeds the inner side wall of the first steel pipe (5); The first convex structure (81) and the second convex structure (61) are located on the same axis and form a ring-shaped steel bar water stop frame (7) filled with a second water stop strip (15).

6. The precipitation well plugging structure according to claim 5, characterized in that, A second steel pipe (11) is sleeved on the outer side wall of the steel bar water stop frame (7), and the bottom end surface of the second steel pipe (11) is welded with the upper surface of the outer water stop ring (9); a first water stop strip (10) is arranged at the connection between the second steel pipe (11) and the outer water stop ring (9).

7. The precipitation well plugging structure of claim 1, wherein, One end of the grout outlet pipe (14) in communication with the inside of the first steel pipe (5) is provided with a water level sensor (17), and the water level sensor (17) is electrically connected with the water pump (12).

8. The precipitation well plugging structure according to claim 6, characterized in that, The grouting pipe (13) and the grout outlet pipe (14) are respectively provided with a first pipe water stop ring (25) and a second pipe water stop ring (26) on the outer wall of the inner side pipe section of the second steel pipe (11) and spaced apart along the axis.

9. The precipitation well plugging structure of claim 6, wherein, After backfilling and plugging of the first steel pipe (5), the grouting pipe (13) and the grout outlet pipe (14) are cut off at the part outside the precipitation well and located in the second steel pipe (11), and a first cover plate (20) and a second cover plate (21) are respectively welded at the openings, and the upper ends of the second steel pipe (11), the first cover plate (20) and the second cover plate (21) are welded with a sealing plate (19).

10. The precipitation well plugging structure of claim 6, wherein, The sealing layer (32) comprises an inner waterproof layer (22), an outer waterproof layer (23), a concrete cushion layer (24), a first concrete layer (29) and a second concrete layer (18); the second concrete layer (18) is concrete with an expansion rate greater than a first preset threshold and less than a second preset threshold; The concrete cushion layer (24) is laid from the top of the partition plate (16) and the outer water stop ring (9) to the upper end of the steel bar water stop frame (7); The inner waterproof layer (22) and the second concrete layer (18) are sequentially laid from bottom to top on the top of the concrete cushion layer (24) and the inner side of the second steel pipe (11), and the second concrete layer (18) is laid to the upper end of the second steel pipe (11); The outer waterproof layer (23) and the first concrete layer (29) are sequentially laid from bottom to top on the top of the concrete cushion layer (24) and the outer side of the second steel pipe (11), the outer waterproof layer (23) is laid to the height of the inner waterproof layer (22), and the first concrete layer (29) is laid to the upper end of the second steel pipe (11). The second steel pipe (11) is sleeved on the outer side wall of the steel bar water stop frame (7), and the bottom end surface of the second steel pipe (11) is welded with the upper surface of the outer water stop ring (9); a first water stop strip (10) is arranged at the connection between the second steel pipe (11) and the outer water stop ring (9). One end of the grout outlet pipe (14) in communication with the inside of the first steel pipe (5) is provided with a water level sensor (17), and the water level sensor (17) is electrically connected with the water pump (12). The grouting pipe (13) and the grout outlet pipe (14) are respectively provided with a first pipe water stop ring (25) and a second pipe water stop ring (26) on the outer wall of the inner side pipe section of the second steel pipe (11) and spaced apart along the axis. After backfilling and plugging of the first steel pipe (5), the grouting pipe (13) and the grout outlet pipe (14) are cut off at the part outside the precipitation well and located in the second steel pipe (11), and a first cover plate (20) and a second cover plate (21) are respectively welded at the openings, and the upper ends of the second steel pipe (11), the first cover plate (20) and the second cover plate (21) are welded with a sealing plate (19). The sealing layer (32) comprises an inner waterproof layer (22), an outer waterproof layer (23), a concrete cushion layer (24), a first concrete layer (29) and a second concrete layer (18); the second concrete layer (18) is concrete with an expansion rate greater than a first preset threshold and less than a second preset threshold; The concrete cushion layer (24) is laid from the top of the partition plate (16) and the outer water stop ring (9) to the upper end of the steel bar water stop frame (7); The inner waterproof layer (22) and the second concrete layer (18) are sequentially laid from bottom to top on the top of the concrete cushion layer (24) and the inner side of the second steel pipe (11), and the second concrete layer (18) is laid to the upper end of the second steel pipe (11); The outer waterproof layer (23) and the first concrete layer (29) are sequentially laid from bottom to top on the top of the concrete cushion layer (24) and the outer side of the second steel pipe (11), the outer waterproof layer (23) is laid to the height of the inner waterproof layer (22), and the first concrete layer (29) is laid to the upper end of the second steel pipe (11).

Images