Underground engineering construction joint waterproof structure

Abstract

The utility model relates to an underground engineering construction joint waterproof structure for shield well side wall construction, and the shield well comprises a plurality of interval arranged ring frame beams, the underground engineering construction joint waterproof structure comprises lower belt side wall and upper belt side wall, the lower belt side wall sets up in the lower end side of ring frame beam, the upper belt side wall sets up in the upper portion of adjacent ring frame beam, and the upper belt side wall is opposite interval arrangement with lower belt side wall and is connected with the diaphragm wall, the opposite side of diaphragm wall is parallel interval and is provided with the dustpan mouth formwork, and is surrounded with upper belt side wall and lower belt side wall and forms the cavity, and the cavity is injected into the concrete and forms the self-compacting impermeable concrete wall, the underground engineering construction joint waterproof structure of the utility model improves the ring frame beam design of shield well, sets up the lower belt side wall and the upper belt side wall on the ring frame beam, sets up the dustpan mouth formwork between the lower belt side wall and the upper belt side wall, injects into the concrete in the cavity and forms the self-compacting impermeable concrete wall to guarantee the waterproof effect of its junction.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and more specifically, to a waterproof structure for construction joints in underground engineering. Background Technology

[0002] As urban underground space development extends deeper, ultra-deep foundation pit projects are becoming increasingly common. Shield tunnel shafts, as key components of tunnel construction, are characterized by their great depth and high water pressure, placing extremely high demands on the waterproofing performance of the structure.

[0003] During construction, the semi-reverse construction method is a commonly used method for the construction of shield tunnel structures in ultra-deep foundation pits. It combines the advantages of both the forward and reverse construction methods, ensuring safety and stability during the excavation process and effectively shortening the construction period. It is the preferred solution for the current construction of deep and large foundation pits.

[0004] However, semi-reverse construction still faces many technical challenges. For example, compared to traditional forward and reverse construction methods for sidewalls, the semi-reverse method creates an additional construction joint at the junction of the permanent and temporary ring beams and the later-cast sidewalls. As a weak point in waterproofing, the construction joint is highly susceptible to leakage under long-term external high water and soil pressure, seriously threatening the long-term stability and operational safety of the structure. How to reasonably and correctly handle the waterproofing problem at the construction joint location is a key area that needs further research in the semi-reverse construction method.

[0005] Therefore, there is an urgent need for a new type of construction joint waterproofing structure that is reasonably designed, waterproof, reliable, and easy to construct, in order to solve the leakage problem of ultra-deep shield tunnels. Utility Model Content

[0006] This utility model provides a waterproof structure for construction joints in underground engineering. Through multiple waterproofing measures and optimized structural design, it significantly improves the waterproof sealing performance at the connection between the ring frame beam and the side wall of the shield tunnel shaft, ensuring the long-term safety and stability of the structure and solving the problem of water seepage at the connection of existing shield tunnel shafts.

[0007] According to one aspect of this utility model, a waterproof structure for construction joints in underground engineering is provided for the construction of the sidewall of a shield tunnel shaft. The shield tunnel shaft includes multiple spaced-apart ring frame beams. The waterproof structure for construction joints in underground engineering includes a lower sidewall and an upper sidewall. The lower sidewall is located at the lower end of the ring frame beams, and the upper sidewall is located at the upper part of an adjacent ring frame beam. The upper sidewall and the lower sidewall are spaced apart and connected to a diaphragm wall. The opposite sides of the diaphragm wall are provided with parallel, spaced-apart hopper-shaped templates, which, together with the upper and lower sidewalls, form a cavity. Concrete is injected into the cavity to form a self-compacting, impermeable concrete wall.

[0008] Based on the above scheme, a preferred embodiment is provided on the end face of the lower side wall, which is equipped with a water-swellable waterproof tape.

[0009] Based on the above scheme, a preferred embodiment is that a grouting pipe is embedded in the self-compacting impermeable concrete wall near the lower side wall, and the grouting pipe extends outward through the scoop-mouth template.

[0010] Based on the above scheme, a preferred embodiment is provided with a water-stop steel plate on the end face of the upper side wall.

[0011] Based on the above scheme, a preferred embodiment is that multiple water-stop tie rods are inserted between the diaphragm wall and the hopper-shaped template.

[0012] Based on the above scheme, preferably, the water-stop tie rods are arranged at intervals along the height direction of the scoop mouth template.

[0013] Based on the above scheme, a preferred embodiment is that the top of the scoop-mouth template is bent outward to form a funnel shape with the end face of the lower side wall.

[0014] This utility model discloses a waterproof structure for construction joints in underground engineering. It improves the design of the ring frame beam in shield tunneling shafts by setting a lower or upper side wall on the ring frame beam and installing a scoop-mouth template between the lower and upper side walls. Concrete is then injected into the cavity to form a self-compacting, impermeable concrete wall, thereby ensuring the waterproof effect at the joint. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is an overall schematic diagram of a waterproof structure for construction joints in underground engineering according to the present invention; Figure 2 This is a schematic diagram of the waterproof structure for construction joints in underground engineering according to this utility model.

[0016] Explanation of icon numbers: 1- Diaphragm wall; 2- Ring frame beam; 3- Lower side wall; 4- Upper side wall; 5- Hopper-shaped formwork; 6- Cavity; 7- Self-compacting impermeable concrete wall; 8- Water-swellable sealing tape; 9- Water-stop steel plate; 10- Water-stop tie rod; 11- Grouting pipe. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0018] Please see Figure 1 and combined Figure 2 As shown, the present invention provides a waterproof structure for construction joints in underground engineering, which is mainly used for waterproofing the connection between the ring frame beam 2 and the permanent diaphragm wall 1 in the shield tunnel shaft.

[0019] The ring frame beam 2 of this utility model serves as a horizontal support during the foundation pit excavation stage, and its end structure can later be used as part of the permanent structure. During construction, a permanent diaphragm wall 1 is first constructed, and then multiple spaced ring frame beams 2 are formed on one side of the permanent diaphragm wall 1. The middle portion of adjacent ring frame beams 2 is removed, and one end of the ring frame beam 2 near the permanent diaphragm wall 1 is reserved, with an upper side wall 4 and a lower side wall 3 located at the bottom of the reserved end. Thus, the lower side wall 3 and upper side wall 4 are spaced apart between adjacent ring frame beams 2 after removal.

[0020] The hopper-shaped formwork 5 is placed parallel to the diaphragm wall 1, with its bottom sealed to the end face of the lower side wall 4, and its top bent outward to form a funnel-shaped pouring opening together with the end of the upper side wall 4. The hopper-shaped formwork 5, together with the diaphragm wall 1, the lower side wall 3, and the upper side wall 4, forms a closed cavity 6.

[0021] Before pouring, water-swellable sealing tape 8 should be pasted on the end face of the lower side wall 3, and a water-stop steel plate 9 should be installed on the end face of the upper side wall 4. The water-stop steel plate 9 should be installed at the weak points of the diaphragm wall 1 where leakage occurs, and the gaps between the water-stop steel plates 9 should be filled with grout. After the grout is compacted, subsequent construction procedures can be carried out to ensure safety.

[0022] Multiple water-stop tie rods 10 are passed through the diaphragm wall 1 and the hopper-mouth template 5 and fastened in place. The water-stop tie rods 10 themselves also have a water-stopping function.

[0023] After the preparation work is completed, high-flowability, self-compacting impermeable concrete is poured into the cavity 6 through the funnel-shaped pouring port, forming a self-compacting impermeable concrete wall 7. This wall tightly and seamlessly connects the lower side wall 3, the upper side wall 4, and the diaphragm wall 1 into a whole. At the same time, during the pouring process, grouting pipes 11 are pre-embedded. One end of the grouting pipe 11 is buried in the concrete, and the other end is led out through the hopper-shaped formwork 5 for later use.

[0024] Once the concrete has reached its strength, the hopper-shaped formwork 5 and the water-stop tie rod 10 (with the external ends cut off) can be removed. This completes the construction of the composite waterproof construction joint, which integrates rigid water-stopping, flexible water-stopping, overall concrete sealing, and subsequent grouting repair.

[0025] Compared with the prior art, the beneficial effects of this utility model are: 1. Multiple layers of protection for reliable waterproofing: This utility model integrates a water-stop steel plate, water-swellable waterproof tape, self-compacting concrete wall, and grouting system, forming a multi-layered waterproofing system that combines rigidity and flexibility, and active and passive waterproofing, which greatly improves the reliability and durability of waterproofing at construction joints.

[0026] 2. Optimized structure and controllable quality: By setting up a hopper-shaped formwork and pouring self-compacting, impermeable concrete, a reinforced waterproof area with good integrity and high density is formed, effectively resisting high water pressure. The funnel-shaped pouring opening design ensures that the concrete is poured fully, avoiding quality defects such as voids and lack of compaction.

[0027] 3. High maintainability: The pre-embedded grouting pipes constitute an "insurance mechanism." Even if minor leaks occur during operation, they can be quickly and effectively sealed by grouting, ensuring the maintainability of the waterproofing system and reducing long-term operation and maintenance costs.

[0028] 4. Convenient construction: This structure integrates existing semi-reverse construction procedures, eliminating the need for complex processes. The water-stop tie rods serve both water-stopping and formwork fixing functions, simplifying the construction process and making it easier to ensure construction quality.

[0029] This invention is particularly applicable to ultra-deep shield tunnels and other open-cut vertical shaft projects constructed using the semi-reverse construction method, and has high promotional value.

[0030] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An underground construction joint waterproof structure for shield well side wall construction, the shield well comprising a plurality of ring frame beams arranged at intervals, characterized in that, The waterproof structure for the construction joint of the underground project includes a lower side wall and an upper side wall. The lower side wall is located at the lower end of the ring frame beam, and the upper side wall is located at the upper part of the adjacent ring frame beam. The upper side wall and the lower side wall are spaced apart and connected to the diaphragm wall. The opposite sides of the diaphragm wall are provided with parallel scoop-mouth templates, which together with the upper side wall and the lower side wall form a cavity. Concrete is injected into the cavity to form a self-compacting impermeable concrete wall.

2. An underground construction joint waterproofing structure according to claim 1, wherein A water-swellable waterproof tape is provided on the end face of the lower side wall.

3. An underground construction joint waterproofing structure according to claim 1, wherein A grouting pipe is embedded in the self-compacting impermeable concrete wall near the lower side wall, and the grouting pipe extends outward through the scoop-mouth template.

4. An underground construction joint waterproofing structure according to claim 1, wherein The end face of the upper side wall is provided with a water-stop steel plate.

5. An underground construction joint waterproofing structure according to claim 1, wherein Multiple water-stop tie rods are inserted between the diaphragm wall and the hopper-shaped template.

6. An underground construction joint waterproofing structure according to claim 5, wherein The water-stopping tie rods are spaced apart along the height direction of the scoop-mouth template.

7. An underground construction joint waterproofing structure according to claim 1, wherein The top of the hopper-shaped template is bent outwards to form a funnel shape with the end face of the lower side wall.

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