Pre-burying and positioning construction method for sweeping and washing water distribution holes in surface of filter tank

Abstract

The invention discloses a filter surface sweeping and washing water distribution hole pre-embedding positioning construction method which comprises the following steps: manufacturing a prefabricated steel sheet and a surface sweeping hole shaping pipe, and uniformly forming a plurality of reserved round holes in the prefabricated steel sheet; binding net rack reinforcing steel bars at the V-shaped grooves in the filter tank; the extruded sheets, the formworks, the prefabricated steel sheets and the surface sweeping hole shaping pipes are installed through a three-point positioning system, and finally concrete pouring and vibrating are conducted between the bottom extruded sheet and the upper extruded sheet; and when the concrete reaches 100% of the design strength, the upper formwork, the upper extruded sheet, the bottom extruded sheet, the upper formwork and the lower formwork are removed. According to the method, three-point fixing is achieved, the precise positioning and stabilizing effects are achieved, and the construction precision is effectively controlled.

Description

Technical Field

[0001] The present invention relates to a pre-embedded positioning construction structure, and particularly to a construction method for pre-embedded positioning of surface washing and water distribution holes in a filter tank. Background Art

[0002] In the construction of a water supply system, the filter tank structure usually includes a carbon filter tank, a sand filter tank, a clarifier, an ozone contact tank, etc. The surface washing holes of the filter tank are located on the filter plate of the sand filter tank. The construction of the surface washing holes of the filter tank is a key and difficult point. It needs to take into account ventilation and structural adaptation. The positioning link mainly relies on manual measurement and marking with ordinary measuring tools, and it is very easy to have deviations due to human negligence and insufficient precision of the measuring tools. In terms of formwork production and installation, wooden or ordinary steel formwork is often used. It is necessary to manually open holes on the formwork, and it is difficult to guarantee the hole position accuracy. Moreover, there are large gaps when splicing, and the fixing method is simple. It is very easy to shift under the concrete pouring pressure, resulting in inaccurate positions of the surface washing holes. When pre-embedding pipes, the fixing method of the pre-embedded pipes is single, mostly simply tied to the steel bars with iron wires, and the stability is poor. It is very easy to shift during concrete vibration. Quality inspection mainly relies on manual visual inspection and simple measuring tool measurement, and it is difficult to comprehensively and accurately detect problems such as position deviation and hole diameter error. As a result, the traditional technology is prone to ventilation and filtration problems due to positioning deviation, reducing the stability and reliability of the water supply system and affecting the water supply stability and water quality. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a construction method for pre-embedded positioning of surface washing and water distribution holes in a filter tank with simple construction and high-precision and efficient control.

[0004] A construction method for pre-embedded positioning of surface washing and water distribution holes in a filter tank of the present invention includes the following steps:

[0005] Step 1: Fabricate a precast steel sheet, and a plurality of reserved round holes are uniformly opened on the precast steel sheet. The distance from the center of each reserved round hole to the wide-edge of the precast steel sheet is at least 50 mm;

[0006] Step 2: Fabricate a surface washing hole shaping pipe using a PVC pipe. The upper and lower ends of the surface washing hole shaping pipe respectively have 45° bevels;

[0007] Step 3: Bind the grid steel bars at the V-shaped groove in the filter tank according to the requirements of the design drawing;

[0008] Step 4: Install the extruded polystyrene board, formwork, precast steel sheet and surface washing hole shaping pipe. The specific process is as follows:

[0009] Step 401: Install the bottom frame bodies on the front and back sides at the bottom of the steel bar grid along the length direction of the steel bar grid;

[0010] Step 402: Fully lay multiple bottom formworks between the bottom of the steel bar grid and the top of the framework, and connect adjacent bottom formworks with connecting devices. The bottom formworks are in close contact with the top wall of the framework.

[0011] Step 403: Fully lay the bottom extruded polystyrene board on the bottom formwork, and fix the bottom extruded polystyrene board and the bottom formwork with iron nails. Then, at the set positions on the bottom extruded polystyrene board, open multiple openings for the surface sweeping hole shaping pipes to pass through according to the set dimensions and shapes.

[0012] Step 404: Install lower concrete cushion blocks between the bottom extruded polystyrene board and the steel bar grid; then place upper concrete cushion blocks on the top of the steel bar grid.

[0013] Step 405: Install multiple prefabricated steel sheets on the main bars of the steel bar grid on the side close to the bottom extruded polystyrene board along the length direction of the steel bar grid. The multiple installed prefabricated steel sheets are continuously arranged along the length direction of the steel bar grid, and the axes of the reserved round holes of the prefabricated steel sheets coincide with the axes of the opening positions on the bottom extruded polystyrene board one by one; tie and fix the intersection points of the prefabricated steel sheets with the main bars and transverse bars of the steel bar grid to ensure that the prefabricated steel sheets are closely attached to the surface of the steel bar grid.

[0014] Step 406: Insert the lower end of the surface sweeping hole shaping pipe through the reserved round hole on the prefabricated steel sheet and insert it into the opening of the bottom extruded polystyrene board to form the first point positioning. Then, tie and fix the surface sweeping hole shaping pipe with the main bars of the steel bar grid to restrict the bottom 1 / 3 height of the surface sweeping hole shaping to form the second point positioning.

[0015] Step 407: Measure the insertion position of the surface sweeping hole shaping pipe on the upper extruded polystyrene board and open holes at the corresponding positions on the upper extruded polystyrene board according to the set dimensions and shapes; then fix the upper formwork and the extruded polystyrene board to form a combined body. While placing the combined body on the upper concrete cushion blocks, insert the upper end of the surface sweeping hole shaping pipe into the corresponding opening position on the upper extruded polystyrene board to form the third point positioning. Finally, connect adjacent upper formworks with connecting devices.

[0016] Step Five: Pour and vibrate the concrete between the bottom extruded polystyrene board and the upper extruded polystyrene board.

[0017] Step Six: After the concrete reaches 100% of the designed strength, remove the upper formwork, upper extruded polystyrene board, bottom extruded polystyrene board, and upper and lower formworks.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The construction method of the present invention has high construction accuracy and stable fixation: Each surface flushing water distribution hole shaping tube can be accurately positioned through prefabricated steel sheets to prevent its slippage. It is fixed by bundling nylon ties with steel bars. 45° bevel treatments are made at both ends of the shaping tube, and then combined with extruded polystyrene boards as formwork lining boards, and the surface flushing water distribution hole shaping tubes are inserted into the holes at corresponding positions to achieve three-point fixation, reaching the effects of accurate positioning and stability, and effectively controlling the construction accuracy.

[0020] 2. Easy formwork removal: There are no holes on the formwork, so there will be no jamming or adhesion during formwork removal. The process of removing the formwork is easy and simple. The lining board is made of extruded polystyrene board, which is convenient for removing the concrete structure and further facilitates the formwork removal operation.

[0021] 3. Simple and fast construction: By prefabricating steel sheets and surface flushing hole shaping tubes, and using the method of fixing with nylon ties, the construction process is significantly simplified and the construction period is shortened.

[0022] 4. Labor saving: It reduces the complex positioning and adjustment work in traditional construction and lowers the labor cost.

[0023] 5. No need for rework: Through the high-precision embedded positioning method, the rework problem caused by inaccurate positioning is avoided.

[0024] 7. Excellent finished product quality: The quality effect of the finished product after construction is extremely excellent, and the construction quality reaches 100% of the expected effect.

[0025] 6. Environmental protection and energy saving: By reasonably using extruded polystyrene boards as formwork lining boards, the material utilization rate is improved and resource waste is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0028] Figure 1 FIG. is a three-dimensional structure diagram of the V-shaped groove in the filter tank after pouring concrete by using the embedded positioning construction method for the surface flushing water distribution holes of the filter tank of the present invention;

[0029] Figure 2 FIG. is Figure 1 a partial cross-sectional view of the structure shown;

[0030] Figure 3 FIG. is Figure 2Schematic diagram of the installation joints of prefabricated steel sheets and surface-sweeping hole sizing pipes in the shown structure;

[0031] Figure 4 is Figure 3 Stereogram of the prefabricated steel sheet in the shown structure;

[0032] Figure 5 is Figure 3 Stereogram of the surface-sweeping hole sizing pipe in the shown structure. Specific implementation manners

[0033] In order to more clearly understand the above-mentioned objects, features and advantages of the present disclosure, the technical solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0034] Many specific details are set forth in the following description in order to fully understand the technical solutions of the present disclosure, but the technical solutions of the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the technical solutions of the present disclosure, rather than all the embodiments.

[0035] As shown in the drawings, a construction method for pre-burying and positioning the surface-sweeping water distribution holes of a filter tank provided by the present invention includes the following steps:

[0036] Step 1: Fabricate a prefabricated steel sheet 6, and a plurality of reserved round holes are evenly formed in the prefabricated steel sheet 6. The distance from the center of each reserved round hole to the wide-side edge of the prefabricated steel sheet 6 is at least 50 mm, so as to ensure that the reserved holes do not exceed the edge of the steel sheet and at the same time provide sufficient space for the subsequent installation of the surface-sweeping hole sizing pipe 7. The specifications of the prefabricated steel sheet 6 can be prefabricated on site according to the size of the surface-sweeping water distribution holes.

[0037] Step 2: Fabricate the surface-sweeping hole sizing pipe 7 by using a PVC pipe. The upper and lower ends of the surface-sweeping hole sizing pipe are respectively provided with 45° bevels (45° bevel treatment is performed at both ends) to facilitate insertion and positioning.

[0038] The size of the surface-sweeping hole sizing pipe can be determined according to the design drawings. For example: the length of the surface-sweeping hole sizing pipe 7 is 330 mm, the outer diameter is 32 mm, and the wall thickness is 2 mm.

[0039] Step 3: Bind the grid steel bars 2 at the V-shaped groove in the filter tank according to the requirements of the design drawings;

[0040] Step 4: Install the extruded polystyrene board, formwork, prefabricated steel sheet and surface-sweeping hole sizing pipe. The specific process is as follows:

[0041] Step 401: Install the bottom frame body 5 on the front and rear sides of the bottom of the steel bar grid 2 along the length direction of the steel bar grid 2.

[0042] Step 402: Lay multiple bottom formworks 3-1 fully between the bottom of the steel bar grid and the top of the frame body 5, and connect adjacent bottom formworks 3-1 with connecting devices (such as bolts or clamps). The bottom formworks 3-1 are in close contact with the top wall of the frame body 5.

[0043] Step 403: Lay the bottom extruded polystyrene board 4-1 fully on the bottom formwork 3-1 and fix the bottom extruded polystyrene board 4-1 and the bottom formwork 3-1 with iron nails. Then, at the set positions on the bottom extruded polystyrene board 4-1, open multiple holes for the surface sweeping hole shaping pipe 7 to pass through according to the set dimensions and shapes, ensuring that the hole sizes and shapes meet the design requirements.

[0044] Step 404: Install lower concrete cushion blocks between the bottom extruded polystyrene board 4-1 and the steel bar grid 2, aiming to isolate the steel bars from the extruded polystyrene board to prevent corrosion and at the same time control the concrete cover thickness (usually ≥30 mm); then place upper concrete cushion blocks on the top of the steel bar grid 2 to provide a support reference for subsequent suspended formwork construction and avoid the formwork directly pressing on the steel bars.

[0045] Step 405: Install multiple precast steel sheets 6 on the main bars of the steel bar grid 2 on the side close to the bottom extruded polystyrene board 4-1 along the length direction of the steel bar grid 2. The multiple installed precast steel sheets 6 are arranged continuously along the length direction of the steel bar grid 2, and the axes of the reserved round holes of the precast steel sheets 6 coincide with the axes of the hole positions on the bottom extruded polystyrene board 4-1 one by one, allowing an axis position error ≤2 mm; preferably, tie and fix the precast steel sheets 6 to the intersections of the main bars and transverse bars of the steel bar grid 2 with nylon ties 8 to ensure that the precast steel sheets 6 are closely attached to the surface of the steel bar grid 2.

[0046] In this step, check whether the axes of the reserved round holes of the precast steel sheets 6 coincide with the through-hole positions on the bottom extruded polystyrene board 4-1, allowing an error ≤2 mm. If the deviation is large, adjust the binding position of the steel sheets to ensure that the subsequent surface sweeping hole shaping pipe 7 can penetrate vertically.

[0047] Step 406: Pass the lower end of the surface sweeping hole shaping pipe 7 through the reserved round hole on the precast steel sheet 6 and insert it into the hole on the bottom extruded polystyrene board 4-1 to form the first point positioning. Then, the surface sweeping hole shaping pipe 7 can be tied and fixed to the main bars of the steel bar grid 2 with nylon ties 8 to restrict the bottom 1 / 3 height of the surface sweeping hole shaping to form the second point positioning and prevent displacement during pouring.

[0048] Step 407: Measure the insertion position of the surface sweep hole shaping tube 7 on the upper extruded plastic board 4-2 and drill holes at the corresponding positions on the upper extruded plastic board 4-2 according to the set dimensions and shapes. When drilling holes in the upper extruded plastic board 4-2, refer to the reserved hole positions of the bottom steel sheet 7 to ensure that the upper and lower holes are vertically aligned and the hole dimensions and shapes meet the design requirements. Then fix the upper template 3-2 and the extruded plastic board 4-2 to form a combined body. While placing the combined body on the upper concrete cushion block, insert the upper end of the surface sweep hole shaping tube 7 into the corresponding drilled hole position on the upper extruded plastic board 4-2 to form the third point positioning. The present invention adopts a three-point positioning system: bottom: drilled hole in the lower extruded plastic board 4-1 + prefabricated steel sheet 6; middle: binding points of the steel bar grid 2; top: drilled hole in the upper extruded plastic board 4-2. Finally, connect adjacent upper templates 3-2 with a connecting device (such as bolts or clamps) to complete the suspended formwork construction of the combined body of the upper template 3-2 and the upper extruded plastic board 4-2.

[0049] Step Five: Pour and vibrate concrete between the bottom extruded plastic board 4-1 and the upper extruded plastic board 4-2. The specific process is as follows:

[0050] Step 501: Use a concrete suspension bucket to layer-pour concrete 1 between the bottom extruded plastic board 4-1 and the upper extruded plastic board 4-2. After pouring, use an insertion vibrator to vibrate the concrete 1 to ensure its density, eliminate air bubbles, and make the concrete 1 closely fit with the bottom extruded plastic board 4-1 and the upper extruded plastic board 4-2.

[0051] Step 502: After pouring is completed, use a trowel to level the surface of the concrete 1; then cure the concrete for 14 days. Curing can be carried out by covering it with wet gunny bags or curing membranes, etc., to keep the humidity of the concrete 1 and prevent cracks caused by water evaporation.

[0052] Step Six: After the concrete 1 reaches 100% of the designed strength, remove the upper template, upper extruded plastic board, bottom extruded plastic board, and upper and lower templates. The process is as follows: First, loosen and remove the connecting device (such as bolts or clamps) connecting the lower template 3-1 and the upper template 3-2. Then use tools such as crowbars and hammers to gently pry up the upper template 3-2 and the upper extruded plastic board 4-2 from the joint. Then remove the frame body 5. Finally, use tools such as crowbars and hammers to gently pry the bottom template 3-1 and the bottom extruded plastic board 4-1 from the joint. During the operation process, avoid excessive force that may damage the concrete 1.

[0053] Since the extruded plastic board is used as the lining board of the formwork, a soft connection is formed between the concrete 1 and the formwork, realizing the integrity of the formwork.

[0054] Embodiments of the present invention are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the invention.

Claims

1. A construction method for pre-burying and positioning the surface washing water distribution holes of a filter, characterized in that It includes the following steps: Step 1: Fabricate a precast steel sheet (6) with a plurality of reserved round holes evenly formed thereon, and the distance from the center of each reserved round hole to the edge of the precast steel sheet in the width direction is at least 50 mm; Step 2: Fabricate a surface-scanning hole shaping pipe (7) using a PVC pipe, and the upper and lower ends of the surface-scanning hole shaping pipe respectively have 45° chamfers; Step 3: Bind the grid reinforcement bars (2) at the V-shaped groove in the filter tank according to the requirements of the design drawing; Step 4: Install the extruded polystyrene board, formwork, precast steel sheet and surface-scanning hole shaping pipe. The specific process is as follows: Step 401: Install bottom frameworks on the front and rear sides at the bottom of the steel bar grid along the length direction of the steel bar grid; Step 402: Lay a plurality of bottom formworks (3-1) densely between the bottom of the steel bar grid and the top of the framework (5) and connect adjacent bottom formworks with connecting devices. The bottom formworks are in close contact with the top wall of the framework; Step 403: Lay the bottom extruded polystyrene board (4-1) densely on the bottom formwork and fix the bottom extruded polystyrene board and the bottom formwork with iron nails. Then, open a plurality of openings for the surface-scanning hole shaping pipe to pass through at the set positions on the bottom extruded polystyrene board according to the set dimensions and shapes; Step 404: Install lower concrete cushion blocks between the bottom extruded polystyrene board and the steel bar grid; Then place upper concrete cushion blocks on the top of the steel bar grid; Step 405: Install a plurality of precast steel sheets on the main steel bars of the steel bar grid close to the side of the bottom extruded polystyrene board along the length direction of the steel bar grid. The plurality of installed precast steel sheets are continuously arranged along the length direction of the steel bar grid, and the axes of the reserved round holes of the precast steel sheets correspond and coincide with the axis positions of the openings on the bottom extruded polystyrene board one by one; Bind and fix the intersections of the precast steel sheets with the main steel bars and transverse steel bars of the steel bar grid to ensure that the precast steel sheets are closely attached to the surface of the steel bar grid; Step 406: Pass the lower end of the surface-scanning hole shaping pipe through the reserved round holes on the precast steel sheet and insert it into the openings on the bottom extruded polystyrene board to form the first point positioning. Then, bind and fix the surface-scanning hole shaping pipe (7) with the main steel bars of the steel bar grid to restrict the bottom 1 / 3 height of the surface-scanning hole to form the second point positioning; Step 407: Measure the insertion position of the surface-scanning hole shaping pipe on the upper extruded polystyrene board (4-2) and open holes at the corresponding positions on the upper extruded polystyrene board according to the set dimensions and shapes; Then fix the upper formwork and the extruded polystyrene board to form a combined body. While placing the combined body on the upper concrete cushion blocks, insert the upper end of the surface-scanning hole shaping pipe into the corresponding opening positions on the upper extruded polystyrene board to form the third point positioning. Finally, connect adjacent upper formworks with connecting devices; Step 5: Pour and vibrate concrete between the bottom extruded polystyrene board and the upper extruded polystyrene board; Step 6: Remove the upper formwork, upper extruded polystyrene board, bottom extruded polystyrene board and upper and lower formworks after the concrete reaches 100% of the designed strength.

2. The construction method for pre-burying and positioning the surface flushing water distribution holes of the filter tank according to claim 1, characterized in that, The specific process of Step 5 is as follows: Step 501: Adopt the concrete lifting bucket method to pour concrete in layers between the bottom extruded polystyrene board and the upper extruded polystyrene board. After pouring, use an inserted vibrator to vibrate the concrete; Step 502: After pouring is completed, use a trowel to level the surface of the concrete; Then cure the concrete for 14 days.

3. The construction method for pre-burying and positioning the surface flushing water distribution holes of the filter tank according to claim 1 or 2, characterized in that, The specific process of Step 6 is as follows: First, loosen and remove the connecting device that connects the lower formwork and the upper formwork. Then, pry up the upper formwork and the upper extruded plastic board. Next, remove the framework. Finally, pry the bottom formwork and the bottom extruded plastic board.

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