Well wall joint water stopping process
By using a folding construction technique for the annular waterstop, it is embedded in the well wall to solve the problem of water leakage at the well wall joint, achieving efficient and safe construction results, avoiding the formation of gaps and the impact of concrete flow, and is suitable for mine shaft construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-04-03
AI Technical Summary
There is a water leakage problem at the joint of the well wall, which is difficult to solve effectively with existing technology and affects construction, especially in reverse construction, where steel plate welding is difficult and grouting effect is difficult to control, leading to the formation of gaps and water seepage.
The construction process of using a folded ring-shaped waterstop involves folding the ring-shaped waterstop and installing it on the well wall template, followed by pouring concrete. This embeds the waterstop within the adjacent well wall section, preventing gaps from forming. The waterstop is also protected before the next well wall section is poured, ensuring that the concrete flow is not affected.
It effectively cuts off seepage gaps, solves the problem of water leakage at well wall joints, has high construction efficiency and safety, does not affect concrete flow, and does not require modification of existing construction processes.
Smart Images
Figure CN121781933A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mine shaft construction technology. Specifically, it relates to a water-stopping process at the joint of the shaft wall. Background Technology
[0002] The outer wall of the frozen well was constructed using a top-down, reverse construction method, where the walls were excavated and then laid down. This resulted in difficulties in ensuring a dense pour at the joints between adjacent outer wall sections during the concrete pouring process. Figure 7 As shown in the diagram, there are always gaps at the joints that cannot be filled, especially near the surrounding rock of the well.
[0003] After the frozen walls thaw, these gaps become water-filled bodies and water channels. Water will enter between the inner and outer well walls along the joint gaps of the outer wall, eventually causing the well walls to leak. During the design process, the outer wall is designed to withstand freezing pressure, while the inner wall is designed to withstand all water pressure. The reverse construction method itself cannot avoid the formation of gaps. This has led to the fact that during the construction of the mining walls, water-stopping treatment is basically abandoned during the joint construction of the outer wall. The problem of water filling between the walls and leakage of the well walls is solved only by improving the construction quality of the inner wall concrete and filling the gaps with grout.
[0004] It has been proven that addressing the source of well wall leakage is the ultimate solution. Therefore, well wall joint sealing technology has received increasing attention in recent years. Existing technologies, such as installing a water-stop steel plate at the joint, involve pre-embedding a steel plate at the bottom of the previous well wall section, and then welding another steel plate below it before constructing the next section. This method requires welding underground, which presents difficulties in positioning and welding the steel plate. Furthermore, the welded steel plate obstructs concrete flow, increasing the difficulty of filling the area behind the steel plate and further affecting the concrete flow to the point of contact with the well wall surrounding rock, exacerbating the formation of gaps. Another method is pre-embedding grouting pipes to inject grout into the joint later to achieve a water-stopping effect. However, in the underground environment, the grout diffusion range and effect cannot be precisely controlled or detected, making it difficult to ensure comprehensive grouting. If some areas are not grouted, seepage will still occur, and the bonding effect between the grout and the well wall section is difficult to guarantee. Therefore, how to effectively solve the problem of water leakage at joints while facilitating construction and not affecting existing construction remains a challenge in the industry. Summary of the Invention
[0005] Therefore, the technical problem to be solved by this invention is to provide a water-stopping process at the joint of the well wall, which can effectively solve the problem of water leakage at the joint, and is easy to construct without modifying existing processes and equipment, and can be perfectly integrated into existing processes; furthermore, during construction, it will not affect the flow of concrete, especially avoiding obstruction of concrete to the position where it meets the surrounding rock near the well wall and the previous section of the outer wall, thus avoiding the formation of gaps; it can also protect the annular waterstop before the next section of the well wall is poured, preventing it from being damaged, and also preventing the annular waterstop from hindering construction.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a water-stopping process at the joint of a well wall, comprising the following steps:
[0007] Step A: Fold the annular waterstop: Fold the folded section on the annular waterstop;
[0008] Step B: Install the ring-shaped waterstop: When the outer wall formwork is lowered to a height of 1-2m from the working surface, put the folded ring-shaped waterstop onto the front edge of the cutting edge of the outer wall formwork.
[0009] Step C: Pouring the first well wall section: Continue to lower the formwork to the working surface and correct the outer wall formwork, then pour concrete into the outer wall formwork to construct the first well wall section; after the concrete has solidified, the annular waterstop is combined with the first well wall section.
[0010] Step D: Excavation of the next working cycle: Excavate the next working face. After excavating to the specified depth, tie the reinforcing bars, remove the formwork, and install the ring-shaped waterstop. At the same time, correct the outer wall formwork.
[0011] Step E: Pouring the Second Well Wall Section: Concrete is poured again into the outer wall formwork to construct the second well wall section. When the concrete is poured close to the first well wall section, the folded section of the annular waterstop is unfolded and pressed into the concrete. Concrete is then poured until the remaining space is completely filled. By folding the annular waterstop, both ends can be completely embedded within adjacent well wall sections. This embedding method effectively integrates the waterstop with the well wall section, cutting off any potential seepage gaps. The folded annular waterstop can be perfectly integrated into the existing construction process without affecting it. When pouring the next well wall section, the annular waterstop remains folded without obstruction. Therefore, the concrete can flow fully towards the surrounding rock of the well wall, effectively filling the surrounding rock and the area connecting to the previous well wall section, thus preventing voids at the well wall location.
[0012] The aforementioned water-stopping process at the joint of the well wall includes an annular water-stop strip comprising a folded section and a main body. The folded section is integrally formed on the bottom end of the main body. When folding the folded section, it is bent from bottom to top into the interior of the main body until the folded section fits against the inner annular surface of the main body. Using a bottom-to-top folding method facilitates rapid subsequent downward unfolding.
[0013] In the above-mentioned water-stopping process at the joint of the well wall, in step A, after the folded section is folded to fit against the inner ring surface of the main body, the free end of the folded section is simultaneously bonded to the inner ring surface of the main body using adhesive. After the folded section is bonded with adhesive, it can remain within the first well wall section to avoid affecting subsequent construction and to prevent damage to the folded section.
[0014] In the above-mentioned water-stopping process at the joint of the well wall, in step D, after the mold is dropped again, the folded section is kept within the side wall of the first well wall section; in step E, before the folded section is unfolded, the adhesive position of the free end of the folded section is separated, and then the folded section is rotated downwards to unfold.
[0015] The aforementioned water-stopping technology at well wall joints incorporates a pre-embedded steel plate within the main body. By using the steel plate, a certain level of strength is provided, preventing excessive deformation during use.
[0016] In the aforementioned water-stopping process at the joint of the well wall, in step B, when the annular water-stop strip is fitted onto the leading edge of the cutting edge: the inner annular surface of the folded section is tightly fitted against the side plate of the leading edge of the cutting edge, and the bottom end of the main body is tightly fitted against the flange of the bottom plate of the cutting edge. This effectively prevents concrete from contacting the folded section, facilitating the rapid unfolding of the folded section.
[0017] In the aforementioned water-stopping process at the joint of the well wall, an upper shielding flange is formed on one side of the main body adjacent to the cutting edge side plate. The free end of the upper shielding flange extends toward the cutting edge side plate. After covering the folded section in the orthogonal projection direction of the vertical axis, the upper shielding flange is tightly fitted with the cutting edge side plate. The free end of the folded section abuts against the bottom of the upper shielding flange. A lower shielding block is formed on the bottom of the side wall of the main body. The lower shielding block is tightly fitted onto the cutting edge bottom plate flange. The folded section is accommodated within the sealed space defined by the upper shielding flange, the main body, the lower shielding block, and the cutting edge. By setting up an upper shielding flange and a lower shielding block, a sealed space is formed at one corner of the front edge of the cutting foot, effectively preventing the concrete from contacting the folded section. After the formwork is removed, the sides and bottom of the folded section are exposed, which facilitates the rapid and complete unfolding of the folded section and its entry into the next section of the well wall concrete. Meanwhile, the flange of the bottom plate of the cutting foot and the side plate of the front edge of the cutting foot can provide protection for the annular waterstop when the formwork is not removed, preventing the waterstop from being damaged by flying rocks from the working face at the bottom of the well.
[0018] In the above-mentioned water-stopping process at the joint of the well wall, protruding water-stopping and embedding flanges are formed on both sides of the folded section. The inner side of the folded section abuts against the front edge side plate of the cutting foot through the water-stopping and embedding flanges, and the other side of the water-stopping and embedding flange abuts against the side wall of the main body.
[0019] In the above-mentioned water-stopping process at the joint of the well wall, in step B, when the annular waterstop is fitted onto the outer wall template: firstly, a section of the annular waterstop is fitted upwards and away from the front edge of the cutting edge, and fits against the outer wall template; then, the entire annular waterstop is fitted into the outer wall template section by section along the circumference of the annular waterstop; after the annular waterstop is completely fitted into the outer wall template, the annular waterstop is pulled downwards and fitted onto the front edge of the cutting edge. The diameter of the leading edge of the cutting edge is larger than the diameter of the upper part of the outer wall template. First, the annular waterstop is placed on the smaller diameter part. The annular waterstop has more room to move through the larger diameter leading edge of the cutting edge, which reduces the difficulty of fitting and avoids excessive stretching of the annular waterstop. After fitting, it is pulled down to the leading edge of the cutting edge, instead of being directly placed on the leading edge of the cutting edge. The advantage of doing this is that it is conducive to the annular waterstop being in a fully fitted working state, without local bending or twisting, especially in the folded section. During the downward pulling process, the leading edge of the folded section of the cutting edge gradually comes into full contact with it and slides on its surface. Due to the effect of friction, the pulling force is downward and the friction force is upward, which makes the folded section automatically fully unfold and smooth and fit against the leading edge of the cutting edge to achieve the best fit effect. Furthermore, the friction makes the free ends of the waterstop embedding flange and the upper shielding flange that contact the leading edge of the section of the cutting edge in a state that is slightly higher than the fixed end, which improves the sealing performance of preventing concrete from entering the sealed space.
[0020] In the aforementioned water-stopping process at the joint of the well wall, in step E, when the concrete is poured to near or just touching the bottom of the first well wall section, the folded section of the annular waterstop is unfolded and pressed into the concrete from the first well wall section. The purpose of this construction is to effectively prevent the folded section from extending too early and affecting the flow of the concrete, allowing the concrete to flow fully and fill the area near the well wall surrounding rock, thereby reducing the formation of voids.
[0021] The technical solution of the present invention achieves the following beneficial technical effects:
[0022] By employing a folded construction technique to embed the annular waterstop strip into the well wall, after construction, both ends of the waterstop strip can be effectively embedded in the two sections of the well wall, cutting off the joint water-conducting gap and solving the problem of joint leakage at its root. No modifications to the existing construction plan are required; it can be perfectly integrated into the existing construction plan without adding any extra construction steps, resulting in very high construction efficiency. It is convenient, quick, and safe to construct underground, and it will not affect the flow of concrete. Attached Figure Description
[0023] Figure 1 A schematic diagram of the annular waterstop strip of the present invention folded and installed on the front edge of the cutting foot;
[0024] Figure 2 A schematic diagram of the location of the second wellbore section after excavation according to the present invention;
[0025] Figure 3 A schematic diagram of the outer wall template being lowered to the pouring position of the second well wall section in this invention;
[0026] Figure 4 A schematic diagram of the annular waterstop strip of the present invention unfolded and respectively embedded in the first well wall section and the second well wall section;
[0027] Figure 5 A schematic cross-sectional view of the unfolded annular waterstop of the present invention;
[0028] Figure 6 A schematic diagram of the cross-section of the annular waterstop strip of the present invention after folding;
[0029] Figure 7 A schematic diagram of the joint between two sections of the well wall in the prior art.
[0030] The reference numerals in the figure are as follows: 1-ring waterstop; 1-1-folded section; 1-2-main body; 1-3-upper shielding flange; 1-4-lower shielding block; 1-5-waterstop embedding flange; 1-6-steel plate.
[0031] 2-Outer wall template; 2-1-Cutting edge leading edge; 2-2-Cutting edge leading edge side plate; 2-2-Cutting edge bottom plate flange. Detailed Implementation
[0032] This embodiment describes a water-stopping process at the joint of the well wall, such as... Figure 1-3 As shown, it includes the following steps:
[0033] Step A: Folding the annular waterstop: The annular waterstop 1 includes a folding section 1-1 and a main body 1-2. The main body 1-2 has an embedded steel plate 1-6 to improve strength and maintain shape. The folding section 1-1 is integrally formed on the bottom end of the main body 1-2. When folding the folding section 1-1: bend the folding section 1-1 from bottom to top into the inside of the main body 1-2 until the folding section 1-1 is in contact with the inner ring surface of the main body 1-2, and the folding is completed. Then, use glue to simultaneously bond and fix the free end of the folding section 1-1 to the inner ring surface of the main body 1-2.
[0034] Step B: Install the annular waterstop: When the outer wall formwork 2 is lowered to a height of 1-2m above the working surface, slip the folded annular waterstop 1 onto the front edge 2-1 of the cutting edge of the outer wall formwork 2; specifically during operation:
[0035] B1: First, insert one section of the annular waterstop 1 upwards into the position away from the front edge 2-1 of the cutting edge, and fit it against the outer wall template 2.
[0036] B2: Then, along the circumference of the annular waterstop 1, insert the entire annular waterstop 1 into the outer wall template 2 segment by segment;
[0037] B3: After the annular waterstop 1 is fully inserted into the outer wall template 2, pull the annular waterstop 1 down and fully fit it onto the front edge 2-1 of the cutting foot, so that the annular waterstop 1 can be fully unfolded, avoiding twisting, bending or other non-fitting phenomena, and completing the installation of the annular waterstop.
[0038] Step C: Pouring the first well wall section: Continue to lower the formwork to the working surface and correct the outer wall formwork 2. Then pour concrete into the outer wall formwork 2 through the pouring port to carry out the construction of the first well wall section; after the concrete solidifies, the main body 1-2 of the annular waterstop 1 is combined with the first well wall section.
[0039] Step D: Excavation of the next working cycle: Excavate the next working face. After excavating to the specified depth, tie the reinforcing bars, lower the formwork, and install the annular waterstop again. Finally, straighten the formwork. When lowering the formwork, the folded section 1-1 is held within the side wall of the first well wall section due to the adhesion of the adhesive. In this step, repeat steps AC, that is, when the formwork is lowered to a distance of 1-2m from the next working face, install the annular waterstop again to ensure that the annular waterstop can be continuously embedded between different well wall sections during subsequent construction.
[0040] Step E: As Figure 4 As shown, the second well wall section is poured: concrete is poured again into the outer wall formwork 2 through the pouring port to construct the second well wall section; when the concrete is poured to near the bottom of the first well wall section or just touching the bottom of the first well wall section, the bonding position of the free end of the folded section 1-1 is first separated, then the folded section 1-1 of the annular waterstop 1 is unfolded and pressed into the concrete, and then the concrete is poured until the remaining space is completely filled. After the two well wall sections are poured, one end of the annular waterstop 1 is completely embedded in the first well wall section, and the other end is completely embedded in the second well wall section.
[0041] In this embodiment, as Figure 5-6As shown, an upper shielding flange 1-3 is formed on one side of the cutting edge side plate 2-2 adjacent to the main body 1-2. The free end of the upper shielding flange 1-3 extends toward the cutting edge side plate 2-2. After the upper shielding flange 1-3 covers the folded section 1-1 in the orthogonal projection direction of the vertical axis, it fits tightly with the cutting edge side plate 2-2. The free end of the folded section 1-1 abuts against the bottom of the upper shielding flange 1-3. The folded section 1-1 is accommodated in the sealed space defined by the upper shielding flange 1-3, the main body 1-2, the lower shielding block 1-4 and the cutting edge 2-1. When the annular waterstop 1 is fitted onto the cutting edge front edge 2-1: the inner annular surface of the folded section 1-1 is tightly fitted onto the cutting edge front edge side plate 2-2 of the cutting edge front edge 2-1, and the bottom end of the main body 1-2 is tightly fitted onto the cutting edge bottom plate flange 2-3 of the cutting edge front edge 2-1; a lower shielding block 1-4 is formed on the bottom of the side wall of the main body 1-2, and the lower shielding block 1-4 is tightly fitted onto the cutting edge bottom plate flange 2-3; protruding waterstop embedding flanges 1-5 are formed on both annular surfaces of the folded section 1-1, and the inner annular surface of the folded section 1-1 abuts against the cutting edge front edge side plate 2-2 through the waterstop embedding flange 1-5, while the other side waterstop embedding flange 1-5 abuts against the side wall of the main body 1-2.
[0042] In step A, the annular waterstop 1 is manufactured from a strip-shaped waterstop, and the specific steps are as follows:
[0043] A1: Cut a strip of waterstop of the corresponding length according to the circumference of the leading edge 2-1 of the cutting edge;
[0044] A2: Trim and roughen the two ends of the strip waterstop, and put the two ends of the strip waterstop into the hot melt machine for hot melt connection to form annular waterstop 1.
[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.
Claims
1. A water-stopping process at the joint of a well wall, characterized in that, Includes the following steps: Step A: Fold the annular waterstop: Fold the folded section (1-1) on the annular waterstop (1); Step B: Install the annular waterstop: When the outer wall template (2) is lowered to a height of 1-2m from the working surface, put the folded annular waterstop (1) onto the front edge (2-1) of the cutting edge of the outer wall template (2); Step C: Pouring the first well wall section: Continue to lower the formwork to the working surface and correct the outer wall formwork (2), then pour concrete into the outer wall formwork (2) to construct the first well wall section; after the concrete solidifies, the annular waterstop (1) is combined with the first well wall section; Step D: Excavation of the next working cycle: Excavate the next working face. After excavating to the specified depth, tie the reinforcing bars, remove the formwork and install the ring waterstop. At the same time, correct the outer wall formwork (2). Step E: Pouring the second well wall section: Pour concrete into the outer wall template (2) again to carry out the construction of the second well wall section; when the concrete is poured to near the first well wall section, unfold the folded section (1-1) of the annular waterstop (1) and press it into the concrete, and then continue to pour concrete until the remaining space is completely filled.
2. The water-stopping process at the joint of the well wall according to claim 1, characterized in that, In step A, the annular waterstop (1) includes a folded section (1-1) and a main body (1-2). The folded section (1-1) is integrally formed on the bottom end of the main body (1-2). When the folded section (1-1) is folded, the folded section (1-1) is bent from bottom to top into the interior of the main body (1-2) until the folded section (1-1) fits against the inner annular surface of the main body (1-2).
3. The water-stopping process at the joint of the well wall according to claim 2, characterized in that, In step A, after the folded segment (1-1) is folded to fit against the inner ring surface of the main body (1-2), the free end of the folded segment (1-1) is simultaneously bonded to the inner ring surface of the main body (1-2) using glue.
4. The water-stopping process at the joint of the well wall according to claim 3, characterized in that, In step D, after the mold is dropped again, the folded section (1-1) remains within the side wall of the first well wall section; in step E, before the folded section (1-1) is unfolded, the adhesive position of the free end of the folded section (1-1) is separated, and then the folded section (1-1) is rotated downwards to unfold.
5. The water-stopping process at the joint of the well wall according to claim 2, characterized in that, The main body (1-2) is embedded with a steel plate (1-6).
6. A water-stopping process at the joint of a well wall according to any one of claims 1-5, characterized in that, In step B, when the annular waterstop (1) is fitted onto the cutting edge front edge (2-1): the inner annular surface of the folded section (1-1) is tightly attached to the cutting edge front edge side plate (2-2) of the cutting edge front edge (2-1), and the bottom end of the main body (1-2) is tightly attached to the cutting edge bottom plate flange (2-3) of the cutting edge front edge (2-1).
7. The water-stopping process at the joint of the well wall according to claim 6, characterized in that, The main body (1-2) has an upper shielding flange (1-3) formed on one side adjacent to the cutting edge front edge side plate (2-2). The free end of the upper shielding flange (1-3) extends toward the cutting edge front edge side plate (2-2). The upper shielding flange (1-3) covers the folded section (1-1) in the orthogonal projection direction of the vertical axis and fits tightly with the cutting edge front edge side plate (2-2). The free end of the folded section (1-1) abuts against the bottom of the upper shielding flange (1-3). A lower shielding block (1-4) is formed on the bottom of the side wall of the main body (1-2). The lower shielding block (1-4) fits tightly with the cutting edge bottom plate flange (2-3). The folded section (1-1) is accommodated in the sealed space defined by the upper shielding flange (1-3), the main body (1-2), the lower shielding block (1-4), and the cutting edge front edge (2-1).
8. The water-stopping process at the joint of the well wall according to claim 6, characterized in that, Both sides of the folded section (1-1) are formed with protruding water-stopping and embedding flanges (1-5). The inner side of the folded section (1-1) abuts against the front edge side plate (2-2) of the cutting foot through the water-stopping and embedding flanges (1-5), and the other side of the water-stopping and embedding flanges (1-5) abuts against the side wall of the main body (1-2).
9. The water-stopping process at the joint of the well wall according to claim 1, characterized in that, In step B, when the annular waterstop (1) is put onto the outer wall template (2): first, a section of the annular waterstop (1) is put upwards and put away from the front edge (2-1) of the cutting foot, and fits against the outer wall template (2). Then, the annular waterstop (1) is put into the outer wall template (2) section by section along the circumference of the annular waterstop (1). After the annular waterstop (1) is completely put into the outer wall template (2), the annular waterstop (1) is pulled down and put on the front edge (2-1) of the cutting foot.
10. The water-stopping process at the joint of the well wall according to claim 1, characterized in that, In step E, when the concrete is poured to near the bottom of the first well wall section or just in contact with the bottom of the first well wall section, the folded section (1-1) of the annular waterstop (1) is unfolded and pressed into the concrete from the first well wall section.