Long-term reconstruction construction method of flood discharge gate

Abstract

This invention discloses a long-term reconstruction method for floodgates, suitable for constructing a new floodgate adjacent to an existing one. The method includes: ① Before the first flood season, partially demolishing the old floodgate's floor slab to form a working trench and excavating a drainage ditch; then, pouring concrete for the new floodgate and installing water-stopping components, supports, and anchor bolts; subsequently, pouring secondary concrete on the outside of the supports in the working trench to form a temporary flood control structure; ② After safely passing the first flood season, demolishing the temporary flood control structure (excluding the water-stopping components) and the remaining floor slab of the old floodgate, wherein the supports and anchor bolts are cut off from the upstream face of the new floodgate; then, reinforcing steel is tied and a new floor slab of the old floodgate is poured, completing the construction. This invention addresses the issues of flood control, waterproofing, and structural stability during long-term construction. It is convenient to construct and low-cost, providing a new approach for floodgate reconstruction and is worthy of promotion within the industry.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering construction technology, and in particular to a method for long-term reconstruction of floodgates. Background Technology

[0002] When reinforcing a floodgate, considering factors such as construction progress and flood control safety, options include demolition and reconstruction on the original site or building a new gate chamber after the old gate. If the option of building a new gate chamber after the old gate is chosen, issues such as the connection between the old and new gate chambers and the arrangement of waterstops inevitably arise. Existing technology generally addresses this issue in two ways: 1) leaving a gap in the new gate chamber and installing the waterstop after the old gate chamber is demolished; 2) pre-grooving the bottom slab of the old gate chamber and installing the waterstop in advance. The former requires leaving a gap in the new gate chamber, affecting the overall reinforcement arrangement of the gate chamber; the latter affects the reinforcement arrangement of the bottom slab after the old gate chamber is demolished. Furthermore, due to the large scale of the new gate chamber and stilling basin construction, it cannot be completed in a non-flood season. Therefore, the reservoir faces flood control risks during the flood season, during which time it is necessary to ensure the effective connection of the waterstops. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method for long-term reconstruction of floodgates, specifically employing the following technical solution:

[0004] The long-term reconstruction method for floodgates described in this invention is suitable for situations where a new floodgate is constructed adjacent to the old one, and includes the following steps:

[0005] The first step, before the arrival of the first flood season, is to first remove part of the bottom slab at the end of the old gate chamber to form a working trench, and then excavate a drainage ditch at the bottom of the working trench. Next, a new gate chamber is poured, and water-stop components, supports, and anchor bolts are installed. One end of the water-stop component is embedded in the bottom slab of the new gate chamber, and the other end is suspended in the working trench. The supports are fitted over the outside of the water-stop component in the working trench, with the bottom of the supports positioned above the drainage ditch and the top of the supports extending and embedded in the bottom slab of the new gate chamber. Anchor bolts are installed on the outside of the supports to connect the new gate chamber, the old gate chamber, and the supports. Then, a second layer of concrete is poured outside the supports in the working trench to form a temporary flood control structure.

[0006] The second step is to dismantle the temporary flood control structure (excluding the water-stopping components) and the remaining bottom slab of the old gate chamber after the first flood season has passed safely. The support components and anchor rods are cut off from the upstream face of the new gate chamber. Then, the new bottom slab reinforcement of the old gate chamber is tied and the new bottom slab of the old gate chamber is poured to complete the construction.

[0007] The water-stopping element is located in the middle of the working groove, and includes a first water-stopping element and a second water-stopping element spaced below it.

[0008] The first water stop is made of copper, and the second water stop is made of rubber.

[0009] The central axis of the drainage ditch is aligned with the extension direction of the water-stopping element, and the drainage ditch is located outside the projection of the water-stopping element.

[0010] The support member is a U-shaped structure consisting of a cover plate, a vertical plate, and a support plate connected in sequence. The cover plate is located above the drainage ditch and has a water leakage hole. The free end of the support plate extends and is embedded in the concrete of the new gate chamber.

[0011] The anchor bolts include a first anchor bolt and a second anchor bolt. The first anchor bolt has an L-shaped structure, with one end welded to the vertical plate and the other end extending into the old gate chamber concrete. The second anchor bolt is set above the support plate, with its ends extending into the old gate chamber concrete and the new gate chamber concrete, respectively, and welded together in the middle.

[0012] The outer side of the waterstop is wrapped with geomembrane and geotextile.

[0013] A closed-cell foam board is provided at the junction of the old and new gate chamber bottom plates above the first water-stopping component, and the top surface of the closed-cell foam board is sealed with sealant.

[0014] The present invention provides a long-term reconstruction method for flood discharge gates. Without demolishing the old gate chamber, the new gate chamber is poured before the first flood season. During the pouring of the new gate chamber, water-stopping components are pre-embedded, and a temporary flood control structure is set up between the old and new gate chambers. This ensures normal flow through both chambers during the first flood season, meeting flood control requirements. Afterward, the temporary flood control structure is removed, and the old gate chamber's base slab is re-poured. Simultaneously, a water-stopping structure is constructed between the old and new gate chambers to ensure the structural safety and waterproofing performance of the flood discharge gate. This invention addresses the issues of flood control, waterproofing, and structural stability during long-term construction. It is convenient to construct and low-cost, providing a new approach to flood discharge gate reconstruction and is worthy of promotion within the industry. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure for excavating the working trench and installing the water-stopping components in this invention.

[0016] Figure 2 This is a schematic diagram of the temporary flood control structure in this invention.

[0017] Figure 3 yes Figure 2 A schematic diagram of the bottom cover plate of the middle support component.

[0018] Figure 4 This is a schematic diagram of the bottom plate structure after the construction of the new and old gate chambers is completed in this invention. Detailed Implementation

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific construction processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0020] like Figure 1-4 As shown, the long-term reconstruction method for floodgates described in this invention is suitable for constructing a new floodgate 2 adjacent to the old floodgate 1, and includes the following steps:

[0021] First, before the arrival of the first flood season, part of the bottom slab at the end of the old gate chamber 1 is removed to form a working trench 3, and a drainage ditch 4 is excavated at the bottom of the working trench 3. Then, the new gate chamber 2 is poured, and water-stopping components (including the first water-stopping component 5 and the second water-stopping component 6), support components 7, and anchor bolts (including the first anchor bolt 8 and the second anchor bolt 9) are installed. One end of the water-stopping component is embedded in the bottom slab of the new gate chamber 2, and the other end is suspended in the working trench 3. The support component 7 is fitted over the outside of the water-stopping component in the working trench 3. The bottom of the support component 7 is set above the drainage ditch 4, and the top of the support component 7 extends and is embedded in the bottom slab of the new gate chamber 2. The anchor bolts are set on the outside of the support component 7 to connect the new gate chamber, the old gate chamber, and the support component 7. Then, secondary concrete 10 is poured on the outside of the support component 7 in the working trench 3 to form a temporary flood control structure.

[0022] Specifically, the bottom surfaces of the old gate chamber 1 and the new gate chamber 2 should maintain a consistent height. The working trench 3 is located at the junction of the old and new gate chambers, and its dimensions are 1×1.5m (width×height). A first water-stop 5 and a second water-stop 6 are alternately installed. The first water-stop 5, made of copper, is located on top and is 0.7m from the top surface of the working trench 3. The second water-stop 6, made of rubber, is located below and is 0.3m from the bottom surface of the working trench 3. The first and second water-stops 5 and 6 are located at the joint between the new gate chamber 2 and the old gate chamber 1, with one end embedded in the concrete of the new gate chamber 2 and the other end suspended in the working trench 3. A drainage ditch 4 is used for gate chamber drainage, with a cross-sectional dimension of 0.1×0.1m (width×height), and its central axis is aligned with the extension direction of the water-stops. The drainage ditch 4 is located at the bottom center of the working trench 3, outside the projection of the water-stops.

[0023] Support member 7 is a U-shaped structural member made of bent steel plate, which serves both as support and as a formwork. Specifically, support member 7 includes a cover plate, a vertical plate, and a support plate connected in sequence. The cover plate is at the bottom, and the support plate is at the top. The cover plate is 0.3m wide and covers the drainage ditch 4, with multiple drainage holes 11 evenly spaced at 1m intervals. The support plate is parallel to the cover plate, and its free end extends horizontally to the right and is embedded in the concrete of the new gate chamber 2 for at least 0.3m.

[0024] Anchor bolts are used to improve the stability of the temporary flood control structure. The first anchor bolt 8 is an L-shaped structure, with one end welded to the vertical plate of the support member 7 and the other end extending into the concrete of the old gate chamber 1. The second anchor bolt 9 is set above the support plate of the support member 7 and is divided into two sections. The left end of the left section extends into the concrete of the old gate chamber 1, and the right end of the right section extends into the concrete of the new gate chamber 2. The right ends of the left section and the left ends of the right section are welded together. The first anchor bolt 8 and the second anchor bolt 9 are both horizontally set, and multiple bolts are set from top to bottom. The length embedded in the concrete of the old and new gate chambers is at least 0.5m.

[0025] The aforementioned secondary concrete 10 is connected to the bottom slab of the new gate chamber 2, leaving only a construction joint and no expansion joint.

[0026] For the first waterstop 5 and the second waterstop 6, protective measures such as wrapping with a layer of geomembrane and a layer of 400g / ㎡ geotextile are required.

[0027] The second step is to dismantle the temporary flood control structure (excluding the water-stopping components, including the first water-stopping component 5 and the second water-stopping component 6) and the remaining bottom plate of the old gate chamber 1 after the first water-stopping component 5 has been safely passed through the first flood season. The support component 7 and the second anchor rod 9 are cut off from the upstream face of the new gate chamber 2. Then, the new bottom plate reinforcement of the old gate chamber 1 is tied and the new bottom plate of the old gate chamber 1 is poured. At the same time, a closed-cell foam board 12 is installed at the junction of the new and old gate chamber bottom plates above the first water-stopping component 5, and the top surface of the closed-cell foam board 12 is sealed with sealant 13 to complete the construction.

[0028] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

Claims

1. A method for long-term reconstruction of a floodgate, suitable for situations where a new floodgate is constructed adjacent to the old floodgate, characterized in that, Includes the following steps: The first step, before the arrival of the first flood season, is to first remove part of the bottom slab at the end of the old gate chamber to form a working trench, and then excavate a drainage ditch at the bottom of the working trench. Next, a new gate chamber is poured, and water-stop components, supports, and anchor bolts are installed. One end of the water-stop component is embedded in the bottom slab of the new gate chamber, and the other end is suspended in the working trench. The supports are fitted over the outside of the water-stop component in the working trench, with the bottom of the supports positioned above the drainage ditch and the top of the supports extending and embedded in the bottom slab of the new gate chamber. Anchor bolts are installed on the outside of the supports to connect the new gate chamber, the old gate chamber, and the supports. Then, a second layer of concrete is poured outside the supports in the working trench to form a temporary flood control structure. The second step is to dismantle the temporary flood control structure except for the water-stopping components and the remaining bottom slab of the old gate chamber after the first flood season has passed safely. The support components and anchor rods are cut off from the upstream face of the new gate chamber. Then, the new bottom slab of the old gate chamber is tied with steel bars and the new bottom slab of the old gate chamber is poured to complete the construction. The support member is a U-shaped structure consisting of a cover plate, a vertical plate, and a support plate connected in sequence. The cover plate is located above the drainage ditch and has a water leakage hole. The free end of the support plate extends and is embedded in the concrete of the new gate chamber.

2. The method for long-term reconstruction of a floodgate according to claim 1, characterized in that: The water-stopping element is located in the middle of the working groove, and includes a first water-stopping element and a second water-stopping element spaced below it.

3. The method for long-term reconstruction of floodgates according to claim 2, characterized in that: The first water-stopping component is made of copper, and the second water-stopping component is made of rubber.

4. The method for long-term reconstruction of a floodgate according to claim 1, characterized in that: The central axis of the drainage ditch is aligned with the extension direction of the water-stopping element, and the drainage ditch is located outside the projection of the water-stopping element.

5. The method for long-term reconstruction of a floodgate according to claim 1, characterized in that: The anchor bolts include a first anchor bolt and a second anchor bolt. The first anchor bolt has an L-shaped structure, with one end welded to the vertical plate and the other end extending into the old gate chamber concrete. The second anchor bolt is set above the support plate, with its ends extending into the old gate chamber concrete and the new gate chamber concrete, respectively, and welded together in the middle.

6. The method for long-term reconstruction of a floodgate according to claim 1, characterized in that: The outer side of the waterstop is wrapped with geomembrane and geotextile.

7. The method for long-term reconstruction of a floodgate according to claim 2, characterized in that: A closed-cell foam board is provided at the junction of the old and new gate chamber bottom plates above the first water-stopping component, and the top surface of the closed-cell foam board is sealed with sealant.

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