A method for treating the foundation of newly-added gate piers of existing water gates and newly-added gate piers

Abstract

The application discloses a method for treating a foundation of a newly-added lock pier of an existing water lock and the newly-added lock pier, and belongs to the technical field of water lock construction.The method comprises the following steps: a through hole is formed in the bottom plate of the existing water lock; the through hole passes through the bottom plate of the existing water lock, an existing cushion layer and a natural foundation; a steel reinforcement cage is placed in the through hole and a newly-added cast-in-place pile is formed by pouring concrete; a part of the steel reinforcement cage is reserved at the top of the newly-added cast-in-place pile; the diameter of the newly-added cast-in-place pile is smaller than that of the through hole and the newly-added cast-in-place pile is higher than the top of the bottom plate of the existing water lock by a certain height; a formwork is arranged on the top of the newly-added cast-in-place pile and is spaced apart from the bottom plate of the existing water lock by a certain distance; a support frame is arranged at the bottom of the formwork; and the formwork is poured in layers to form the newly-added lock pier. The newly-added lock pier is arranged on the bottom plate of the existing water lock, so that the single-hole water lock is changed into a double-hole water lock, the width of the lock chamber is reduced, the width of the lock gate is reduced, the deformation of the lock gate and the lock chamber can be fully coordinated, and the opening and closing of the lock gate on both sides can be more smooth.

Description

Technical Field

[0001] This invention relates to the field of foundation treatment technology for water conservancy projects, and discloses a method for foundation treatment of new gate piers for existing sluice gates and the method for adding new gate piers. Background Technology

[0002] Currently, some small and medium-sized sluice gates in soft soil areas have problems such as the gate chamber width being designed too wide in the early stage, which leads to the gate being unable to open and close after a short period of operation due to the deformation of the gate itself. Although the deformation of the gate itself can be reduced by replacing it with a gate with a more rigid one, the problem of the gate not opening and closing synchronously on both sides and the gate not operating smoothly due to the excessive width of the gate chamber will still cause the sluice gate to lose its function.

[0003] When faced with the above problems, the conventional solution is to dismantle and rebuild the sluice gate, but this leads to repeated investment and a great waste.

[0004] Currently, no solutions other than demolition and reconstruction have been reported for addressing the above-mentioned problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method for treating the foundation of new gate piers on existing sluice gates and to add new gate piers. By setting new gate piers on the bottom plate of existing sluice gates, single-hole sluice gates are transformed into double-hole sluice gates, thereby reducing the width of the gate chamber and thus the width of the gate. This allows the deformation of the gate itself to be fully coordinated with the gate chamber, and also makes the opening and closing of both sides of the gate smoother.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A method for treating the foundation of newly added gate piers in an existing sluice gate includes the following steps:

[0008] A through hole is made in the existing sluice gate bottom plate, and the through hole passes through the existing sluice gate bottom plate, the existing cushion layer and the natural foundation;

[0009] A reinforcing cage, extending a certain height h1 above the existing sluice gate bottom slab, is placed inside the through-hole. Concrete is then poured into the reinforcing cage to form a new cast-in-place pile. The diameter of the new cast-in-place pile is smaller than the diameter of the through-hole, and the new cast-in-place pile extends a certain height h2 above the existing sluice gate bottom slab.

[0010] A formwork is erected at the top of the newly added cast-in-place piles, which are higher than the bottom slab of the existing sluice gate, and a support frame is installed at the bottom of the formwork.

[0011] ​The newly added gate piers are constructed using layered pouring. At least one layer of concrete is poured on the formwork to form a new gate pier of a certain height. The steel cage at the top of the newly added cast-in-place pile extends into the new gate pier. It is determined whether the new gate pier has reached the preset height. If it has not reached the preset height, the formwork is set up and layered pouring continues until the preset height is reached. Then the support frame and the formwork are removed. If the preset height is reached, the support frame and the formwork are removed directly.

[0012] Furthermore, the diameter of the through hole is 8-12 cm larger than the diameter of the newly added cast-in-place pile.

[0013] Furthermore, before pouring concrete to form the new cast-in-place pile, a sleeve is placed in the through hole. The outer diameter of the sleeve is smaller than the diameter of the through hole, and the inner diameter is slightly larger than or equal to the diameter of the new cast-in-place pile. The space between the sleeve and the through hole is filled with expansive clay.

[0014] Furthermore, the height h3 of the newly added cast-in-place pile reinforcement extending into the newly added gate pier shall not be less than 1 / 4 of the net height of the newly added gate pier, where h3 = h1 - h2.

[0015] Furthermore, the sum of the compression deformation of the newly added cast-in-place pile itself under the load of the newly added gate pier and the displacement of the pile end penetrating the foundation downward is s, and the value of the height h2 is in the range of 1.0s to 1.1s.

[0016] Furthermore, the compressive deformation s1 of the newly added cast-in-place pile under the load of the newly added gate pier is calculated using the following formula:

[0017]

[0018] Where: σ t σ b These represent the stresses at the top and bottom of the newly added cast-in-place pile, respectively; l represents the length of the newly added cast-in-place pile; E p To determine the compression modulus of the newly added cast-in-place piles.

[0019] Furthermore, the displacement s2 of the newly added cast-in-place pile penetrating the foundation downwards under the load of the newly added gate pier is calculated using the following formula:

[0020]

[0021] Where: E s ν s s2 and s2 are the deformation modulus and Poisson's ratio of the foundation soil under the newly added cast-in-place pile, respectively; r is the radius of the newly added cast-in-place pile. When the bottom of the newly added cast-in-place pile is located in an incompressible soil layer, s2 = 0.

[0022] The stress σ on the top of the newly added cast-in-place pile t Calculate using the following formula:

[0023]

[0024] Where: P is the pressure exerted by the newly added gate pier on the top of the newly added cast-in-place pile;

[0025] The stress σ at the bottom of the newly added cast-in-place pile b Calculate using the following formula:

[0026]

[0027] Where: l si The thickness of the i-th layer of soil around the pile within the length of the newly added cast-in-place pile; u si The side friction resistance of the i-th layer of soil around the newly added cast-in-place pile.

[0028] Furthermore, the support frame includes multiple horizontal beams and multiple vertical beams, which are fixed by welding. The multiple vertical beams are supported by cables suspended by two cranes installed upstream and downstream of the sluice gate.

[0029] Furthermore, after the newly added cast-in-place piles have settled, if there is a gap between the newly added gate pier and the existing sluice gate bottom plate, the gap should be filled.

[0030] A new type of gate pier, located between two existing gate piers of a sluice gate, includes:

[0031] The through-hole passes through the existing sluice gate bottom slab, the existing cushion layer, and the natural foundation;

[0032] A steel reinforcement cage is installed inside the through hole and is a certain height h1 above the bottom plate of the existing sluice gate.

[0033] The newly added cast-in-place piles have a diameter smaller than that of the through-hole and are a certain height h2 above the existing sluice gate bottom slab.

[0034] The newly added gate pier is located at the top of the newly added cast-in-place pile, and the steel cage at the top of the newly added cast-in-place pile extends into the newly added gate pier and is formed by layered pouring.

[0035] In this process, a formwork is erected at the top of the newly added cast-in-place pile, which is higher than the existing sluice gate bottom slab, and a support frame is set at the bottom of the formwork. The newly added gate pier is poured in layers, with at least one layer of concrete poured on the formwork so that the steel cage at the top of the newly added cast-in-place pile extends into the newly added gate pier. It is determined whether the newly added gate pier has reached the preset height. If it has not reached the preset height, the formwork is set up and the layered pouring continues until the preset height is reached. Then the support frame and the formwork are removed. If the preset height is reached, the support frame and the formwork are removed directly.

[0036] ​Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] The present invention provides a method for foundation treatment of new gate piers for existing sluice gates and a method for adding new gate piers. It does not require the demolition and reconstruction of the sluice gate. It only requires the construction of new gate piers on the existing sluice gate. Then, by adding multiple gates, the problem of the gates being difficult to open and close synchronously on both sides and the gates not operating smoothly due to the excessive width of the gate chamber is solved.

[0038] Furthermore, this invention employs a method where the load of the newly added gate piers is borne by the newly added cast-in-place piles, thus avoiding the impact of the newly added gate piers on the existing sluice gate base slab. The newly added gate piers will not exert pressure on the existing sluice gate base slab, thereby achieving the goal of avoiding the demolition and reconstruction of the sluice gate. Firstly, this approach only requires partial modification of the sluice gate chamber, greatly reducing the engineering investment for demolition and reconstruction. Secondly, such partial modification has a shorter construction period, allowing the sluice gate's function to be restored as quickly as possible without affecting the sluice gate's flood control and drainage safety, achieving both economic and safety goals. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are intended to explain the invention, but do not constitute an undue limitation thereof. In the drawings:

[0040] Figure 1 This is a flowchart of a method for treating the foundation of an existing sluice gate pier according to the present invention.

[0041] Figure 2 This is a schematic diagram of the newly added gate pier in this invention.

[0042] Figure 3 This is a schematic diagram of the stress analysis of the newly added cast-in-place pile in this invention.

[0043] Figure 4 This is a specific embodiment of the present invention showing the condition of the central hole of a sluice gate before its renovation.

[0044] Figure 5 This is a specific embodiment of the present invention, showing the case where the central hole of a newly added gate pier after the renovation of a sluice gate is changed from a single hole to a double hole.

[0045] Among them, 1. Existing gate piers; 2. Through holes; 3. Existing sluice gate bottom slabs; 4. Existing cushion layer; 5. Existing cast-in-place piles; 6. New cast-in-place piles; 7. New gate piers; 8. Natural foundation; 9. Reinforcing cage. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] This invention provides a method for treating the foundation of newly added gate piers in existing sluice gates, such as... Figures 1-3 As shown, it includes the following steps:

[0049] Step S1: Open a through hole 2 in the existing sluice gate bottom plate 3. The through hole 2 passes through the existing sluice gate bottom plate 3, the existing cushion layer 4 and the natural foundation 8.

[0050] Step S2: Place a reinforcing cage 9, which is a certain height h1 above the existing sluice gate bottom slab 3, inside the through hole 2, and pour concrete into the reinforcing cage 9 to form a new cast-in-place pile 6. The diameter of the new cast-in-place pile 6 is smaller than the diameter of the through hole 2, and the new cast-in-place pile 6 is a certain height h2 above the existing sluice gate bottom slab 3.

[0051] Step S3: Erect a template at the top of the newly added cast-in-place pile 6, which is higher than the existing sluice gate bottom plate 3, and set a support frame at the bottom of the template. The support frame is used to support the newly formed gate pier 7 and prevent the newly formed gate pier 7 from exerting pressure on the existing sluice gate bottom plate 3.

[0052] Step S4: The new gate pier 7 is poured in layers. At least one layer of concrete is poured on the formwork to form the new gate pier 7 of a certain height. The steel cage 9 at the top of the new cast-in-place pile 6 is extended into the new gate pier 7. It is determined whether the new gate pier 7 has reached the preset height. If it has not reached the preset height, the formwork is set up and the layered pouring is continued until the preset height is reached. Then the support frame and formwork are removed. If the preset height is reached, the support frame and formwork are removed directly.

[0053] ​The present invention provides a method for treating the foundation of an existing sluice gate with a new gate pier. This method does not require the demolition and reconstruction of the sluice gate. Instead, it only requires the construction of a new gate pier 7 between two existing gate piers 1 on the existing sluice gate. This method solves the problem of the gates not opening and closing synchronously and the gates not operating smoothly due to the excessive width of the gate chamber by adding multiple gates.

[0054] Furthermore, this invention employs a method where the load of the newly added gate pier 7 is borne by the newly added cast-in-place piles 6, thus avoiding the impact of the newly added gate pier 7 on the existing sluice gate bottom slab 3. The newly added gate pier 7 will not exert pressure on the existing sluice gate bottom slab 3, thereby achieving the goal of avoiding the demolition and reconstruction of the sluice gate. Firstly, this approach only requires partial modification of the sluice gate chamber, greatly reducing the engineering investment for demolition and reconstruction. Secondly, such partial modification has a shorter construction period, allowing the sluice gate's function to be restored as soon as possible without affecting the sluice gate's flood control and drainage safety, achieving both economic and safety goals.

[0055] In this invention, in order to ensure that the weight of the newly added gate pier 7 is fully loaded onto the newly added cast-in-place pile 6, the diameter of the through hole 2 is 8-12 cm larger than the diameter of the newly added cast-in-place pile 6. In a specific embodiment of this invention, the diameter of the through hole 2 is 10 cm larger than the diameter of the newly added cast-in-place pile 6.

[0056] In this invention, the support frame includes multiple horizontal beams and multiple vertical beams, which are fixed by welding. The multiple vertical beams are supported by cables suspended by two cranes set up upstream and downstream of the sluice gate.

[0057] In this invention, in order to ensure that the newly added cast-in-place pile 6 does not affect the existing sluice gate bottom plate 3, the part of it that passes through the existing sluice gate bottom plate 3 must be separated from the bottom plate by using a sleeve to minimize the downward frictional effect on the existing sluice gate bottom plate 3 when the newly added cast-in-place pile 6 settles under the load of the newly added gate pier 7.

[0058] Specifically, the outer diameter of the sleeve is smaller than the diameter of the through hole 2 and the inner diameter is slightly larger than or equal to the diameter of the newly added cast-in-place pile 6. The space between the sleeve and the existing sluice gate bottom plate 3 is filled with expansive clay.

[0059] In this embodiment of the invention, the sleeve is a steel sleeve with a wall thickness of 2cm, and the outer diameter of the steel sleeve is 6cm smaller than the diameter of the existing sluice gate bottom plate 3 through hole 2.

[0060] In this invention, in order to ensure that the load of the newly added gate pier 7 is borne entirely by the newly added cast-in-place pile 6, the steel cage 9 of the newly added cast-in-place pile 6 must extend into the newly added gate pier 7. The extension length is determined according to the structural calculation. The height h3 of the steel bar of the newly added cast-in-place pile 6 extending into the newly added gate pier 7 shall not be less than 1 / 4 of the net height of the newly added gate pier 7, h3 = h1 - h2.

[0061] In this invention, in order to ensure that the newly added gate pier 7 is tightly connected to the existing sluice gate bottom plate 3 without putting pressure on the existing sluice gate bottom plate 3, a height h2 must be reserved between the newly added gate pier 7 and the existing sluice gate bottom plate 3. The sum of the compression deformation of the newly added cast-in-place pile 6 itself and the displacement of the pile end of the newly added cast-in-place pile 6 into the foundation under the load of the newly added gate pier 7 is s. The value range of the height h2 is 1.0s to 1.1s.

[0062] The compressive deformation s1 of the newly added cast-in-place pile 6 under the load of the newly added gate pier 7 is calculated using the following formula:

[0063]

[0064] Where: σ t σ b These represent the stresses at the top and bottom of the newly added cast-in-place pile 6, respectively, both in kPa; l represents the length of the newly added cast-in-place pile 6, in meters; E p The compression modulus of the newly added cast-in-place pile 6 is expressed in GPa, and in the specific embodiment of this invention, it is taken as 30 GPa.

[0065] The displacement s2 of the newly added cast-in-place pile 6 penetrating the foundation downwards under the load of the newly added gate pier 7 is calculated using the following formula:

[0066]

[0067] Where: E s ν s These are the deformation modulus and Poisson's ratio of the foundation soil under the newly added cast-in-place pile 6, respectively; r is the radius of the newly added cast-in-place pile 6 in meters. When the bottom of the newly added cast-in-place pile 6 is located in an incompressible soil layer, s2 = 0.

[0068] The stress σ on the top of the newly added cast-in-place pile 6 t Calculate using the following formula:

[0069]

[0070] Where: P is the pressure exerted by the newly added gate pier 7 on the top of the newly added cast-in-place pile 6, in kN;

[0071] The stress σ at the bottom of the newly added cast-in-place pile 6 b Calculate using the following formula:

[0072]

[0073] Where: l si This refers to the thickness of the i-th layer of soil around the newly added cast-in-place pile within its length range, expressed in meters (m). si The side friction resistance of the i-th layer of soil around the newly added cast-in-place pile 6 is expressed in kN.

[0074] In general, after the new cast-in-place piles 6 within and below the existing sluice gate bottom slab 3 are poured, when pouring the portion of the new cast-in-place piles 6 located within the new gate pier 7 and the new gate pier 7, a distance h2 is maintained between the new gate pier 7 and the existing sluice gate bottom slab 3. The distance is h2≥s=s1+s2. In particular, when the bottom of the new cast-in-place piles 6 is located in an incompressible soil layer, h2≥s=s1. The purpose is to ensure that after the cast-in-place piles have settled, the new gate pier 7 sits precisely on the existing sluice gate bottom slab 3, but without exerting pressure on the existing sluice gate bottom slab 3. The entire load of the new gate pier 7 is borne by the new cast-in-place piles 6.

[0075] In this invention, after the newly added cast-in-place pile 6 has settled, if there is a gap between the newly added gate pier 7 and the existing sluice gate bottom plate 3, the gap is filled with a second filler. The second filler can be resin mortar, cement mortar, or asphalt.

[0076] A sluice gate located on a deep, soft soil foundation, originally designed with a gate width of 36 meters, was completed in 2010. In early 2015, problems arose with gate deformation and difficulty in opening and closing, rendering it unusable for an extended period. Initially, the design considered demolishing and rebuilding the sluice gate on the same site, requiring an investment of approximately 180 million yuan. However, subsequent analysis determined that the sluice gate structure was largely intact, with the only issue being the difficulty in opening and closing the gate. It was recommended to add gate piers (7) to reduce the gate width. Because the original sluice gate foundation used a cast-in-place pile composite foundation, and after review, adding gate piers (7) would compromise the bearing capacity and settlement safety factor of the original foundation, necessitating reinforcement measures for the natural foundation (8).

[0077] To ensure that the new gate pier 7 does not compromise the safety of the existing sluice gate foundation, while simultaneously meeting the bearing capacity and settlement requirements of the new gate pier 7, the design adopts the concept that the entire load of the new gate pier 7 is borne by the new cast-in-place piles 6. To achieve this design, a certain gap must be maintained between the new gate pier 7 and the existing sluice gate base slab 3. This ensures that after the new cast-in-place piles 6 have settled, the new gate pier 7 will be tightly integrated with the existing sluice gate base slab 3, but without exerting any pressure on the existing sluice gate base slab 3. This involves accurately calculating the settlement of the new cast-in-place piles 6 under the load of the new gate pier 7, and also considering the downward vertical friction exerted by the new cast-in-place piles 6 on the base slab during settlement, taking measures to minimize this effect. The specific methods are as follows:

[0078] (1) A hole is made on the existing sluice gate bottom plate 3. The diameter of the new cast-in-place pile 6 is 1200mm, and the diameter of the through hole 2 is 1300mm. The new cast-in-place pile 6 is located between two existing cast-in-place piles 5.

[0079] (2) A steel sleeve is used to separate the newly added cast-in-place pile 6 through the existing sluice gate bottom plate 3. The steel sleeve has a wall thickness of 2cm and expansive clay is used to fill the space between the steel sleeve and the existing sluice gate bottom plate 3.

[0080] (3) According to formula (1), the compressive deformation s1 of the newly added cast-in-place pile 6 under the load of the newly added gate pier 7 is calculated to be 5.5 mm:

[0081] (4) According to formula (2), the displacement s2 of the newly added cast-in-place pile 6 penetrating the foundation downward under the load of the newly added gate pier 7 is calculated to be 63.7 mm.

[0082] (5) The distance h2 between the newly added gate pier 7 and the existing sluice gate bottom plate 3 is 69.2 mm.

[0083] (6) The newly added gate pier 7 is poured in layers. The first layer of concrete is 500mm thick and is made of steel formwork. Support beams and longitudinal beams are installed on the bottom of the steel formwork. The weight on the longitudinal beams is supported by cables suspended by two cranes at the upstream and downstream ends.

[0084] (7) After the first layer of concrete is poured and reaches the required curing time, the first layer of new gate pier 7 is formed. The crane can be removed and the height can be increased directly on the first layer of new gate pier 7.

[0085] (8) During the construction process, closely monitor the gap between the newly added gate pier 7 and the existing sluice gate bottom plate 3.

[0086] (9) After the completion of the new gate pier 7, according to on-site monitoring, the settlement was 67.4 mm, and the residual gap between the new gate pier 7 and the existing sluice gate bottom plate 3 was 1.8 mm.

[0087] (10) The remaining voids are filled with hot asphalt.

[0088] After the above reinforcement and renovation, such as Figure 4 The image shows the condition of the central opening of a sluice gate before its modification, according to a specific embodiment of the present invention. Figure 5 As shown in the figure, in a specific embodiment of the present invention, after the renovation of a sluice gate, the middle hole of the newly added gate pier 7 was changed from a single hole to a double hole. The project investment was about 48 million yuan, which is only 26.7% of the investment cost of demolition and reconstruction. At the same time, the construction period was shortened from 2 years to 6 months, achieving the goal of being both economical and time-saving.

[0089] The present invention also provides a newly added gate pier 7, which is located between two existing gate piers 1 of the sluice gate, such as... Figures 1-3 As shown, it includes:

[0090] Through hole 2, passing through the existing sluice gate bottom slab 3, the existing cushion layer 4 and the natural foundation 8;

[0091] The steel cage 9 is installed inside the through hole 2 and is a certain height h1 above the existing sluice gate bottom plate 3;

[0092] The newly added cast-in-place pile 6 has a diameter smaller than that of the through hole 2, and is a certain height h2 above the existing sluice gate bottom slab 3.

[0093] The newly added gate pier 7 is located on top of the newly added cast-in-place pile 6. The steel cage 9 at the top of the newly added cast-in-place pile 6 extends into the newly added gate pier 7 and is formed by layered pouring.

[0094] In this process, a formwork is erected on the top of the newly added cast-in-place pile 6, which is higher than the existing sluice gate bottom slab 3, and a support frame is set at the bottom of the formwork. The newly added gate pier 7 is poured in layers, with at least one layer of concrete poured on the formwork so that the steel cage 9 at the top of the newly added cast-in-place pile 6 extends into the newly added gate pier 7. It is determined whether the newly added gate pier 7 has reached the preset height. If it has not reached the preset height, the formwork is set up and the layered pouring continues until the preset height is reached. Then the support frame and formwork are removed. If the preset height is reached, the support frame and formwork are removed directly.

[0095] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.​

Claims

1. A method for treating the foundation of newly added gate piers in an existing sluice gate, characterized in that, Includes the following steps: A through hole is made in the existing sluice gate bottom plate, and the through hole passes through the existing sluice gate bottom plate, the existing cushion layer and the natural foundation; Place a piece inside the through hole that is a certain height above the existing sluice gate bottom plate. A reinforcing cage is constructed, and concrete is poured into the reinforcing cage to form a new cast-in-place pile. The diameter of the new cast-in-place pile is smaller than the diameter of the through hole, and the new cast-in-place pile is higher than the bottom slab of the existing sluice gate by a certain height. , This ensures that a portion of the reinforcing cage is retained at the top of the newly added cast-in-place pile; before pouring concrete to form the new cast-in-place pile, a sleeve is placed in the through hole, the outer diameter of the sleeve is smaller than the diameter of the through hole and the inner diameter is slightly larger than or equal to the diameter of the new cast-in-place pile, and expansive clay is used to fill the space between the sleeve and the through hole. A formwork is erected at the top of the newly added cast-in-place piles, which are higher than the bottom slab of the existing sluice gate, and a support frame is installed at the bottom of the formwork. The newly added gate piers are constructed using layered pouring. At least one layer of concrete is poured on the template to form a new gate pier of a certain height. The steel cage at the top of the newly added cast-in-place pile extends into the new gate pier. It is determined whether the new gate pier has reached the preset height. If it has not reached the preset height, the template is set up and layered pouring is continued until the preset height is reached. Then the support frame and the template are removed. If the preset height is reached, the support frame and the template are removed directly. The sum of the compressive deformation of the newly added cast-in-place pile itself and the displacement of the pile tip penetrating the foundation under the load of the newly added gate pier is: The height The range of values ​​is The load of the newly added gate piers is entirely borne by the newly added cast-in-place piles.

2. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: The diameter of the through hole is 8-12 cm larger than the diameter of the newly added cast-in-place pile.

3. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: The height by which the reinforcing bars of the newly added cast-in-place piles extend into the newly added gate pier Not less than 1 / 4 of the net height of the newly added gate pier, .

4. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: The compressive deformation of the newly added cast-in-place piles under the load of the newly added gate piers Calculate using the following formula: （1） in: , These are the stresses experienced at the top and bottom of the newly added cast-in-place piles, respectively. For the newly added pile length; To determine the compression modulus of the newly added cast-in-place piles.

5. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: Displacement of the newly added cast-in-place pile tip into the foundation under the load of the newly added gate pier Calculate using the following formula: （2） in: , These are the deformation modulus and Poisson's ratio of the foundation soil beneath the newly added cast-in-place piles, respectively. For the radius of the newly added cast-in-place pile, when the bottom of the newly added cast-in-place pile is located in an incompressible soil layer, =0; Stress on the top of newly added cast-in-place piles Calculate using the following formula: （3） in: The pressure exerted by the newly added gate piers on the top of the newly added cast-in-place piles; Stress on the bottom of newly added cast-in-place piles Calculate using the following formula: （4） in: For the newly added cast-in-place piles within the length range of the pile perimeter The thickness of the soil layer; For the newly added cast-in-place piles, the pile perimeter Side friction resistance of the soil layer.

6. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: The support frame includes multiple horizontal beams and multiple vertical beams, which are fixed by welding. The multiple vertical beams are supported by cables suspended by two cranes installed upstream and downstream of the sluice gate.

7. The method for treating the foundation of newly added gate piers of existing sluice gates according to claim 1, characterized in that: After the newly added cast-in-place piles have settled, if there is a gap between the new gate pier and the existing sluice gate bottom plate, the gap should be filled.

8. A newly added gate pier, located between two existing gate piers of a sluice gate, characterized in that, include: The through-hole passes through the existing sluice gate bottom slab, the existing cushion layer, and the natural foundation; The reinforcing cage is installed inside the through hole and is positioned at a certain height above the existing sluice gate bottom slab. ; The newly added cast-in-place piles have a diameter smaller than that of the through-hole and are positioned a certain height above the existing sluice gate bottom slab. , It is formed by pouring concrete into the steel cage; A casing is installed inside the through hole. The outer diameter of the casing is smaller than the diameter of the through hole and the inner diameter is slightly larger than or equal to the diameter of the newly added cast-in-place pile. Expansive clay is filled between the casing and the through hole. A new gate pier is installed at the top of the newly added cast-in-place pile. The reinforcing cage at the top of the newly added cast-in-place pile extends into the new gate pier, and the pier is formed by layered casting. The sum of the compressive deformation of the newly added cast-in-place pile itself and the displacement of the pile tip into the foundation under the load of the new gate pier is... The height The range of values ​​is The load of the newly added gate piers is entirely borne by the newly added cast-in-place piles. In this process, a formwork is erected at the top of the newly added cast-in-place pile, which is higher than the existing sluice gate bottom slab, and a support frame is set at the bottom of the formwork. The newly added gate pier is poured in layers, with at least one layer of concrete poured on the formwork so that the steel cage at the top of the newly added cast-in-place pile extends into the newly added gate pier. It is determined whether the newly added gate pier has reached the preset height. If it has not reached the preset height, the formwork is set up and the layered pouring continues until the preset height is reached. Then the support frame and the formwork are removed. If the preset height is reached, the support frame and the formwork are removed directly.

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