Water-stopping structure for horizontal steel pipe support wall-penetrating construction in foundation pit

Abstract

The utility model relates to the technical field of geotechnical engineering design, and disclose foundation pit inside horizontal steel pipe support wall -penetration construction water stop structure, including foundation pit and basement outer wall, the concrete ring beam is equipped in the foundation pit, the round steel pipe of horizontal arrangement is welded on the concrete ring beam, the other end of round steel pipe extends to the inside of basement outer wall, the utility model discloses through the construction of the integrated structure of'round steel pipe support + rubber waterstop + double steel flange plate clamping ', utilize the high -strength characteristic of round steel pipe, cooperate concrete ring beam and realize foundation pit horizontal support, satisfy the stress demand of foundation pit, again through the adhesion of rubber waterstop and steel pipe, basement outer wall, the combination bolt locking extrusion forms the seal, and simultaneously the round plugging steel sheet plugging steel pipe inside, effectively block the water seepage path of steel pipe and outer wall through -penetrating place, solved the problem of traditional support structure water stop effect is poor, realize the cooperation of support and water stop function uniformity.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering design technology, and more specifically, to a water-stopping structure for horizontal steel pipe support through-wall construction in foundation pits. Background Technology

[0002] In foundation pit construction, horizontal steel pipe supports are key components for resisting soil pressure on the side walls of the foundation pit and preventing deformation of the foundation pit. However, when the horizontal steel pipe supports need to penetrate the basement exterior wall, how to ensure the stability of the support under stress while blocking the seepage channel at the penetration point between the exterior wall and the steel pipe becomes the core technical challenge in the project. In existing technologies, two main approaches are commonly used for horizontal steel pipe supports penetrating walls in foundation pits: First, a single rubber waterstop is installed at the penetration point between the steel pipe and the external wall, relying solely on the natural adhesion between the waterstop, the steel pipe, and the concrete to achieve a seal. This approach has significant drawbacks: the rubber waterstop lacks rigid constraint and is prone to displacement or deformation under horizontal loads in the foundation pit, leading to gaps between the waterstop and the steel pipe / concrete, resulting in a very high risk of water seepage. Furthermore, the lack of a reliable fixing structure between the waterstop and the supporting steel pipe makes it susceptible to displacement during concrete pouring, further compromising the sealing effect and failing to meet the waterproofing requirements of underground engineering projects.

[0003] Secondly, a composite structure of "H-beam transition + water-stop steel plate" is adopted. This involves first welding and fixing the horizontal steel pipe support to the H-beam, then embedding the H-beam into the basement exterior wall, and simultaneously welding a water-stop steel plate to the outside of the H-beam. However, this solution has several problems: Firstly, the H-beam's cross-section is "I"-shaped, making the welding joint with the water-stop steel plate complex and difficult to achieve a full weld seal; the weld gaps can easily become seepage channels. Secondly, the transition joint between the H-beam and the horizontal steel pipe, and the bonding joint between the H-beam and the exterior wall concrete, are weak points. Stress concentration at these joints can easily lead to concrete cracking. Furthermore, the H-beam section inside the foundation pit needs to be removed later; the vibration during the removal process can damage the bond between the water-stop steel plate and the concrete, further exacerbating the seepage risk. Therefore, improvements are needed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a water-stopping structure for horizontal steel pipe support through-wall construction in the foundation pit, which has the advantage of water-stopping.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a horizontal steel pipe support structure for wall penetration construction in a foundation pit, comprising a foundation pit and a basement exterior wall. A concrete ring beam is provided within the foundation pit, and a horizontally arranged circular steel pipe is welded onto the concrete ring beam. The other end of the circular steel pipe extends into the interior of the basement exterior wall. A water-stop structure is provided at the penetration point between the circular steel pipe and the basement exterior wall. The water-stop structure includes a rubber water-stop strip fitted over the outside of the circular steel pipe. A first steel flange and a second steel flange are respectively located on both sides of the rubber water-stop strip on the outside of the circular steel pipe. Circular holes are evenly distributed on the surface of the rubber water-stop strip. The first and second steel flanges are clamped and fixed to the rubber water-stop strip by bolts and nuts passing through the circular holes. A circular sealing steel plate is welded to the circular steel pipe near the inner side of the basement exterior wall.

[0006] As a preferred embodiment of this utility model, the water-stopping structure further includes a sealing gasket, which is fitted onto the bolt and located between the bolt head and the first steel flange, and between the nut and the second steel flange.

[0007] As a preferred embodiment of this utility model, the cross-section of the rubber waterstop is dumbbell-shaped, and the protruding part faces the inner and outer sides of the basement exterior wall.

[0008] As a preferred technical solution of this utility model, the inner ring of the rubber waterstop is interference-fitted with the outer wall of the round steel pipe, and the outer ring of the rubber waterstop is tightly fitted with the inner concrete wall of the basement exterior wall to form a radial sealing surface.

[0009] As a preferred technical solution of this utility model, the circular holes are evenly distributed along the circumference of the rubber waterstop, and the number of circular holes is the same as the number of bolts and nuts. After the bolts pass through the circular holes, they are locked with the nuts, so that the rubber waterstop is evenly squeezed along the axial direction of the round steel pipe.

[0010] As a preferred embodiment of this utility model, the round steel pipe is fixed to the inner rings of the first steel flange and the second steel flange by full welding, and the outer side of the weld is coated with an anti-corrosion sealing layer.

[0011] As a preferred technical solution of this utility model, the circular steel pipe cavity between the circular sealing steel plate and the concrete ring beam is filled with micro-expansion concrete.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model constructs an integrated structure of "circular steel pipe support + rubber waterstop + double steel flange clamping". It utilizes the high strength of the circular steel pipe and works with the concrete ring beam to achieve horizontal support for the foundation pit and meet the stress requirements of the foundation pit. The rubber waterstop is bonded to the steel pipe and the basement exterior wall, and a seal is formed by bolt locking and compression. At the same time, the circular sealing steel plate seals the inside of the steel pipe, effectively blocking the seepage path at the penetration point between the steel pipe and the exterior wall. This solves the problem of poor water-stopping effect of traditional support structures and achieves the synergistic unity of support and water-stopping functions.

[0013] 2. This utility model adds a sealing gasket to the water-stop structure to accurately fill the gap between the bolt head, nut and steel flange contact surface, preventing water from seeping along the bolt connection node and further improving the sealing system; compared with the traditional H-beam steel transition structure, no secondary conversion construction is required, simplifying the construction process, and the connection of each component is reliable, which can be adapted to foundation pits of different sizes, improving construction efficiency and structural stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the water-stopping structure of this utility model; Figure 3 This is a schematic diagram of the steel flange of this utility model; Figure 4 for Figure 3 A magnified schematic diagram of the partial structure at point A in the middle; Figure 5 This is a schematic diagram of the rubber waterstop of this utility model.

[0015] In the diagram: 1. Excavation pit; 2. Basement exterior wall; 3. Concrete ring beam; 4. Circular steel pipe; 5. Circular sealing steel plate; 6. Water-stop structure; 61. First steel flange; 62. Second steel flange; 63. Rubber waterstop; 64. Bolt; 65. Nut; 66. Sealing gasket; 67. Circular hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1 to 5As shown, this utility model provides a horizontal steel pipe support for wall penetration construction in a foundation pit, including a foundation pit 1 and a basement exterior wall 2. A concrete ring beam 3 is provided in the foundation pit 1, and a horizontally arranged round steel pipe 4 is welded on the concrete ring beam 3. The other end of the round steel pipe 4 extends into the interior of the basement exterior wall 2. A water-stop structure 6 is provided at the penetration point between the round steel pipe 4 and the basement exterior wall 2. The water-stop structure 6 includes a rubber water-stop strip 63 sleeved on the outside of the round steel pipe 4. A first steel flange 61 and a second steel flange 62 are respectively located on both sides of the rubber water-stop strip 63 on the outside of the round steel pipe 4. The surface of the rubber water-stop strip 63 is evenly provided with round holes 67. The first steel flange 61 and the second steel flange 62 are clamped and fixed to the rubber water-stop strip 63 by bolts 64 and nuts 65 passing through the round holes 67. A circular sealing steel plate 5 is welded to the round steel pipe 4 near the inner side of the basement exterior wall 2.

[0018] The function is achieved by constructing an integrated "support + water stop" framework. The concrete ring beam 3 provides a stable load-bearing foundation for the circular steel pipe 4. The circular steel pipe 4 is horizontally welded to the ring beam, with one end extending into the basement exterior wall 2 to bear the horizontal support load of the foundation pit 1. At the penetration point between the steel pipe and the exterior wall, a rubber waterstop 63 is fitted onto the outside of the steel pipe to form an initial seal. Two steel flanges are located on both sides of the waterstop, and are tightened by bolts 64 through circular holes 67 and nuts 65 to clamp the waterstop, squeezing it to fit against the steel pipe and the exterior wall, blocking the seepage path. A circular sealing steel plate 5 is welded to the inside of the steel pipe to seal the pipe end and prevent water from seeping from the inside of the steel pipe, ultimately achieving the synergy of support and water stop.

[0019] The water-stopping structure 6 also includes a sealing gasket 66, which is fitted onto the bolt 64 and located between the head of the bolt 64 and the first steel flange 61, and between the nut 65 and the second steel flange 62.

[0020] Adding a sealing gasket 66 resolves the potential for water leakage at bolted joints. The bolt head 64 connects to the first steel flange 61 and the nut. There is a tiny gap between the contact surface of 65 and the second steel flange 62, which can easily become a water seepage channel; after the sealing gasket 66 is fitted with bolts, it is squeezed and deformed when the bolts are tightened, filling the gap between the contact surfaces, forming a node sealing layer, blocking water from seeping through the gap between the bolts and the flange, and further improving the sealing system of the water-stopping structure 6.

[0021] Among them, the cross-section of the rubber waterstop 63 is dumbbell-shaped, and the protruding part faces the inner and outer sides of the basement exterior wall 2.

[0022] The sealing effect is improved by optimizing the cross-sectional shape of the rubber waterstop 63. The protruding part of the dumbbell-shaped cross-section faces the inner and outer sides of the basement exterior wall 2. On the one hand, the protruding structure increases the contact area between the waterstop and the exterior wall concrete, and the concrete can interlock with the protrusion during pouring, reducing the gap between the waterstop and the concrete. On the other hand, when the bolt 64 clamps the waterstop, the middle and two ends of the dumbbell-shaped structure are subjected to more uniform force, and the protruding part can produce greater elastic deformation, tightly adhering to the outer wall of the steel pipe and the inner wall of the concrete, strengthening the radial sealing ability and reducing the risk of water seepage.

[0023] The inner ring of the rubber waterstop 63 is interference-fitted with the outer wall of the round steel pipe 4, and the outer ring of the rubber waterstop 63 is tightly fitted with the inner concrete wall of the basement exterior wall 2 to form a radial sealing surface.

[0024] A radial sealing barrier is constructed through an interference fit and tight fit. The inner ring of the rubber waterstop 63 is interference-fitted with the outer wall of the round steel pipe 4, meaning the inner diameter of the waterstop is slightly smaller than the outer diameter of the steel pipe. During installation, the waterstop is stretched and tightly adheres to the outer wall of the steel pipe, eliminating the initial gap between them. The outer ring of the waterstop is tightly fitted to the inner concrete wall of the basement exterior wall 2. During concrete pouring, the outer ring of the waterstop is squeezed, ensuring seamless contact between the outer ring and the concrete. Together, they form a radial sealing surface surrounding the steel pipe, directly blocking water penetration along the radial gaps between the steel pipe and the waterstop, and between the waterstop and the concrete.

[0025] Among them, the round holes 67 are evenly distributed along the circumference of the rubber waterstop 63, and the number of round holes 67 is the same as the number of bolts 64 and nuts 65. After the bolts 64 pass through the round holes 67, they are locked with the nuts 65, so that the rubber waterstop 63 is evenly squeezed along the axial direction of the round steel pipe 4.

[0026] The evenly distributed design of the round holes 67 and bolts 64 achieves uniform force sealing of the waterstop. The round holes 67 are evenly distributed along the circumference of the waterstop and match the number of bolts, ensuring that the force on all points along the circumference of the waterstop is consistent when the bolts are tightened. Under axial compression, the waterstop deforms evenly along the axial direction of the steel pipe, avoiding excessive local force that could cause damage to the waterstop, or insufficient local force that could cause sealing gaps. This ensures that the waterstop can tightly fit the steel pipe and the outer wall both circumferentially and axially, maximizing the axial sealing effect.

[0027] The round steel pipe 4 is fixed to the inner rings of the first steel flange 61 and the second steel flange 62 by full welding, and the outside of the weld is coated with an anti-corrosion sealing layer.

[0028] By employing full welding and an anti-corrosion sealing layer, the reliability and impermeability of the connection between the flange and the steel pipe are enhanced. Full welding ensures complete fusion between the inner ring of the flange and the outer wall of the steel pipe, eliminating welding gaps and preventing water seepage along the weld seam. Simultaneously, the high strength of the full welding connection allows it to withstand bolt clamping forces and horizontal loads from the foundation pit, preventing relative displacement between the flange and the steel pipe from damaging the water-stopping structure. The anti-corrosion sealing layer applied to the weld joint isolates air and moisture from contact with the weld metal, preventing weld corrosion, extending the structural service life, and further sealing any potential minor defects in the weld, thus improving sealing safety.

[0029] Among them, the cavity of the circular steel pipe 4 between the circular sealing steel plate 5 and the concrete ring beam 3 is filled with micro-expansion concrete.

[0030] By filling the steel pipe cavity with micro-expansion concrete, both internal water sealing and structural reinforcement are achieved. The steel pipe cavity between the circular sealing steel plate 5 and the concrete ring beam 3 is a hollow structure, prone to water accumulation or seepage. After the micro-expansion concrete is poured in, the concrete undergoes slight expansion during hardening, which tightly fills the internal space of the cavity, eliminating voids and blocking the flow and penetration of water within the pipe. Simultaneously, the micro-expansion concrete, together with the inner wall of the steel pipe, the sealing steel plate, and the ring beam, form an integrated load-bearing structure, increasing the rigidity and load-bearing capacity of the steel pipe, enhancing support stability, and indirectly ensuring the sealing effect of the external water-stopping structure.

[0031] Working principle and usage process of this utility model: Based on the scale of the foundation pit 1, geological conditions, and the thickness of the basement exterior wall 2, the dimensions of the concrete ring beam 3, the diameter of the circular steel pipe 4, and the parameters of each component of the waterstop structure 6 are determined. The foundation pit 1 is excavated to the design depth, the reinforcing bars of the concrete ring beam 3 are tied, concrete is poured and cured to the design strength to form a supporting foundation. A horizontally positioned circular steel pipe 4 is taken, and the first steel flange 61 and the second steel flange 62 are respectively fitted onto the predetermined positions of the circular steel pipe 4. The inner rings of the first steel flange 61 and the second steel flange 62 are fully welded to the outer wall of the circular steel pipe 4. After welding, an anti-corrosion sealing layer is applied to the outside of the weld to prevent future corrosion from affecting the seal. A dumbbell-shaped rubber waterstop 63 is taken, with its protruding part facing the inner and outer sides of the basement exterior wall 2. The inner ring of the rubber waterstop 63 is fitted with the outer wall of the circular steel pipe 4 with an interference fit to ensure a seamless fit. The position of the rubber waterstop 63 is adjusted so that… It is located between the first steel flange 61 and the second steel flange 62, aligned with the evenly distributed circular holes 67 along the circumference of the rubber waterstop 63; sealing gaskets 66 are respectively placed between the bolt head and the first steel flange 61 and between the nut 65 and the second steel flange 62; after the bolt 64 is passed through the circular hole 67, it is locked with the nut 65, so that the rubber waterstop 63 is evenly compressed along the axial direction of the circular steel pipe 4 to form an axial seal; one end of the assembled waterstop structure 6 is welded and fixed to the concrete ring beam 3 to ensure the horizontality of the circular steel pipe 4 and form a horizontal support for the foundation pit; the reinforcement of the basement exterior wall 2 is tied so that the circular steel pipe 63 is evenly compressed along the axial direction of the rubber waterstop 63 to form an axial seal. The other end of pipe 4 extends into the interior of the basement exterior wall 2, ensuring that the outer ring of the rubber waterstop 63 is tightly fitted to the inner concrete wall of the basement exterior wall 2; the exterior wall concrete is poured and cured, so that the waterstop structure 6 and the exterior wall form an integral whole; after the concrete of the basement exterior wall 2 is cured, the circular sealing steel plate 5 is welded and fixed to the inner side of the circular steel pipe 4 near the inner side of the basement exterior wall 2, sealing the end of the circular steel pipe 4; micro-expansion concrete is poured into the cavity of the circular steel pipe 4 between the circular sealing steel plate 5 and the concrete ring beam 3, and after the concrete hardens, the gaps in the pipe are filled to further enhance the waterstop and the integrity of the structure.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A horizontal steel pipe support structure for wall penetration construction in an excavation pit, comprising an excavation pit (1) and an outer wall of the basement (2), characterized in that: The foundation pit (1) is provided with a concrete ring beam (3), and a horizontally arranged round steel pipe (4) is welded on the concrete ring beam (3). The other end of the round steel pipe (4) extends into the interior of the basement exterior wall (2). A water-stop structure (6) is provided at the penetration point between the round steel pipe (4) and the basement exterior wall (2). The water-stop structure (6) includes a rubber water-stop strip (63) sleeved on the outside of the round steel pipe (4). A first steel flange (61) and a second steel flange (62) are respectively located on both sides of the rubber water-stop strip (63) on the outside of the round steel pipe (4). The surface of the rubber water-stop strip (63) is uniformly provided with round holes (67). The first steel flange (61) and the second steel flange (62) are clamped and fixed to the rubber water-stop strip (63) by bolts (64) and nuts (65) passing through the round holes (67). A circular sealing steel plate (5) is welded to the round steel pipe (4) near the inside of the basement exterior wall (2).

2. The horizontal steel pipe support wall-penetrating water-stopping structure in the foundation pit according to claim 1, characterized in that: The water-stopping structure (6) also includes a sealing gasket (66), which is fitted onto the bolt (64) and located between the head of the bolt (64) and the first steel flange (61), and between the nut (65) and the second steel flange (62).

3. The horizontal steel pipe support wall-penetrating water-stopping structure in the foundation pit according to claim 1, characterized in that: The cross-section of the rubber waterstop (63) is dumbbell-shaped, and the protruding part faces the inside and outside of the basement exterior wall (2).

4. The horizontal steel pipe support wall-penetrating waterproofing structure in the foundation pit according to claim 1, characterized in that: The inner ring of the rubber waterstop (63) is interference-fitted with the outer wall of the round steel pipe (4), and the outer ring of the rubber waterstop (63) is tightly fitted with the concrete inner wall of the basement exterior wall (2) to form a radial sealing surface.

5. The horizontal steel pipe support wall-penetrating water-stopping structure in the foundation pit according to claim 1, characterized in that: The circular holes (67) are evenly distributed along the circumference of the rubber waterstop (63), and the number of circular holes (67) is the same as the number of bolts (64) and nuts (65). After the bolts (64) pass through the circular holes (67), they are locked with the nuts (65), so that the rubber waterstop (63) is evenly squeezed along the axial direction of the round steel pipe (4).

6. The horizontal steel pipe support wall-penetrating water-stopping structure in the foundation pit according to claim 1, characterized in that: The round steel pipe (4) is fixed to the inner ring of the first steel flange (61) and the second steel flange (62) by full welding, and the outside of the weld is coated with an anti-corrosion sealing layer.

7. The horizontal steel pipe support wall-penetrating water-stopping structure in the foundation pit according to claim 1, characterized in that: The cavity of the circular steel pipe (4) between the circular sealing steel plate (5) and the concrete ring beam (3) is filled with micro-expansion concrete.

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