Segmented processing of underground continuous wall reinforcement cage main reinforcement precise positioning device and construction method

Abstract

The application discloses a kind of underground continuous wall reinforcement cage section processing main reinforcement precision positioning device and construction method, including bottom bracket, heating device, main reinforcement positioning device, lifting device, track, the bottom bracket is by angle steel and square tube, two ends are connected with lifting device by connecting rod piece, lifting device bottom is installed pulley and track is connected;Heating device is by three dry burning type electric heating tube and temperature control device composition, and is installed on the top of bottom bracket;Main reinforcement positioning device is by aluminum square tray, tray is filled with paraffin composite phase change material, after heating, phase change material softens, and main reinforcement is pressed into indentation when upper section cage processing;Indentation is retained after cooling and solidification, as the main reinforcement installation datum of lower section cage.The application realizes millimeter level precision positioning of upper and lower section reinforcement cage main reinforcement by phase change material hot melt, solves the problems of large butt deviation of upper and lower section main reinforcement and low construction efficiency when section hoisting of super-deep underground continuous wall reinforcement cage.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit construction technology in building engineering, specifically to a device and construction method for precise positioning of main reinforcement bars in the segmented processing of underground continuous wall steel cages. Background Technology

[0002] With the increasing maturity of deep foundation pit technology, more and more deep foundation pit projects are being undertaken, and the depth of these pits is also increasing. Consequently, the length of the reinforcing cage for diaphragm walls is gradually increasing. However, integrated reinforcing cages place significant demands on the construction site and construction process, are limited by hoisting length, and are also subject to safety considerations. Therefore, segmented reinforcing cages are gradually becoming the trend. The connection of the main reinforcement bars in segmented reinforcing cages has become a crucial aspect of construction quality and safety.

[0003] In traditional processes, the positioning of the main reinforcing bars in the upper and lower sections of the steel cage mainly relies on manual measurement. This method is prone to the following problems:

[0004] 1. Manual positioning has low accuracy and large error. During the connection process after the steel cage is lifted, the main bars are prone to misalignment, which makes the connection difficult. After the main bars are connected, the axis is offset and the connection is not tight, which affects the overall stress performance of the steel cage.

[0005] 2. During the fabrication of the upper and lower sections of the steel cage, the positioning of the main reinforcement bars needs to be measured and laid out separately, resulting in low construction efficiency.

[0006] In existing related technologies, such as the rebar cage fabrication device for bored piles disclosed in patent document (CN217044433U), although the main reinforcement is initially positioned by a positioning plate and positioning bars with long and short intervals, and the stirrups are automatically wound by rotating rollers and moving railcars, its positioning method is a rigid fixed sleeve positioning, which is only applicable to the arrangement of main reinforcement bars with fixed spacing and fixed diameter. Once the design parameters of the rebar cage (such as the number, spacing, diameter or cage thickness) change, the positioning plate needs to be remade, which lacks universality and adaptability; and its positioning accuracy depends on the manual installation of the sleeve, which cannot achieve millimeter-level dynamic adjustment. Patent document (CN114700668A) discloses an automatic processing equipment for I-beams of rebar cage joints for underground continuous wall. This equipment focuses on the automatic welding of I-beam joints, and improves welding quality and safety through positioning frames, clamping and flipping mechanisms and adjustable welding mechanisms, but it does not address the problem of segmented docking positioning of the main reinforcement bars of the rebar cage, and has no technical means to control the deviation of the main reinforcement axis, and cannot solve the core problem of misalignment of segmented rebar cage docking.

[0007] In addition, prefabricated positioning brackets can be used for the upper and lower main reinforcement bars. However, these brackets cannot adapt to different main reinforcement bar spacings, diameters, and cage thicknesses. Different types of fixing brackets need to be fabricated for different thicknesses and reinforcement configurations, leading to increased costs and poor economic efficiency and sales. Therefore, a main reinforcement bar positioning device capable of millimeter-level positioning and adaptable to different cage thicknesses and main reinforcement bar spacings is needed. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a device and construction method for precise positioning of main reinforcement bars in the segmented processing of underground continuous wall steel cages, so as to solve the technical problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a precise positioning device for main reinforcement bars in the segmented processing of underground continuous wall steel cages, comprising a base support, a main reinforcement bar positioning device, a heating device, a temperature control device, a lifting device, a track, and pulleys; the main reinforcement bar positioning device includes a square tray and a phase change material filled therein; the heating device is disposed between the base support and the main reinforcement bar positioning device; the temperature control device is electrically connected to the heating device; the lifting device is connected to both ends of the base support for stepless adjustment of the height of the main reinforcement bar positioning device; the pulleys are installed at the bottom of the lifting device and cooperate with the track to realize the movement of the device.

[0010] Furthermore, the phase change material is a paraffin-based composite phase change material with a melting point of 60–80℃. It is in a plastic state after heating and solidifies after cooling, retaining the main rib indentation.

[0011] Furthermore, the square tray is made of aluminum with a thickness of 10-15mm, which has high thermal conductivity, and is embedded in the top of the base bracket.

[0012] Furthermore, the heating device uses three dry-burning electric heating tubes with adjustable power, which are evenly arranged above the base bracket and below the main rib positioning device.

[0013] Furthermore, the temperature control device is a PID controller with a temperature control accuracy of ±1℃.

[0014] Furthermore, the base bracket is welded into a rectangular frame by two 6000–7000 mm long No. 6 angle steels and two 200 mm long No. 6 angle steels. Inside the outer frame, 45° and 135° square tubes are continuously arranged along the length direction to enhance the longitudinal rigidity of the base bracket. The two ends of the base bracket are connected to the lifting device through connecting rods.

[0015] Furthermore, the lifting device is a hydraulic lifting system installed at both ends of the base bracket, which can realize continuous stepless adjustment of the height of the main rib positioning device.

[0016] Furthermore, the track is a lightweight steel rail, fixed on both sides of the rebar cage processing platform, and the horizontal distance between the track and the rebar cage processing platform is 500mm.

[0017] Furthermore, the pulley is a pulley with a locking function. After moving to the predetermined position, the pulley is locked to prevent the device from shifting during construction.

[0018] A construction method for precise positioning of main reinforcement bars in segmented processing of diaphragm wall steel cages, employing the aforementioned precise positioning device for main reinforcement bars in segmented processing of diaphragm wall steel cages, includes the following steps:

[0019] S1. Lay tracks on both sides of the steel cage processing platform and install the main reinforcement positioning device on the tracks;

[0020] S2. Move the device to the end of the upper section of the steel cage and adjust the top elevation of the main reinforcement positioning device to the preset height position of the main reinforcement;

[0021] S3. Start the heating device to heat the main rib positioning device, so that the phase change material changes from solid to plastic state, and then maintain a constant temperature through the temperature control device.

[0022] S4. Lay out the main reinforcement bars of the upper section of the steel cage according to the design requirements. After the main reinforcement bar at the tail of the upper section of the steel cage is pressed into the main reinforcement bar positioning device, a dent is formed. Turn off the heating device and leave the dent after the phase change material cools and solidifies. This dent will serve as the installation reference for the main reinforcement bars of the lower section of the cage.

[0023] S5. Move the position of the lower section of the steel cage head of the main reinforcement positioning device by track, and lay the main reinforcement according to the indentation of the main reinforcement positioning device as a reference to complete the remaining process to form the steel cage.

[0024] S6. After the steel cage is fabricated, the heating device is turned on again to heat the main reinforcement positioning device, so that the phase change material changes from solid to liquid and returns to its initial state, enabling reuse.

[0025] The present invention has the following beneficial effects:

[0026] This invention utilizes the properties of phase change materials and, through heating-curing control and combined with a lifting device, achieves millimeter-level precision positioning of main reinforcement bars under different spacing, diameter, and thickness of the reinforcement cage. This ensures that the docking deviation of the main reinforcement bars during segmented hoisting is controlled within millimeters, solving the problems of large docking deviation of the upper and lower main reinforcement bars and low construction efficiency during segmented hoisting of reinforcement cages for ultra-deep underground continuous walls. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the cross-section of the present invention;

[0028] Figure 2 This is a planar schematic diagram of the present invention;

[0029] Figure 3 This is a cross-sectional view of the present invention.

[0030] In the diagram: 1. Phase change material; 2. Main reinforcement; 3. Dry-burning electric heating element; 4. Angle steel; 5. Square tube; 6. Square tray; 7. Temperature control device; 8. Track; 9. Pulley; 10. Rebar cage processing platform; 11. Connecting rod; 12. Lifting device; 13. Dent. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figures 1 to 3 As shown, this embodiment uses the construction of a deep foundation pit diaphragm wall as an application scenario to describe in detail the specific structure and parameters of a device for precise positioning of main reinforcement bars in the segmented processing of diaphragm wall steel cages and its construction method:

[0033] The present invention provides a precision positioning device for the main reinforcement bars in the segmented processing of underground continuous wall steel cages, comprising a base bracket, a heating device, a main reinforcement bar positioning device, a lifting device 12, and a track 8.

[0034] The base support is formed by angle steel 4 and square tube 5, and both ends are connected to the lifting device 12 through connecting rods 11. The bottom of the lifting device 12 is equipped with pulleys 9 and connected to the track 8. The heating device adopts three dry-burning electric heating tubes 3 evenly arranged above the base support and below the main reinforcement positioning device, and is equipped with a temperature control device 7. The main reinforcement positioning device consists of a square tray 6 and a phase change material 1 filled inside. The main reinforcement precision positioning device can be infinitely adjusted through the lifting device 12 to adapt to various steel cages of different thicknesses.

[0035] Furthermore, the base support is formed by welding two 6000mm-7000mm long No. 6 angle steels 4 and two 200mm long No. 6 angle steels 4 to form a square outer frame. Inside the outer frame, 45° and 135° 15mm*15mm square tubes are continuously arranged along the length direction to ensure the longitudinal rigidity of the base support. The two ends of the base support are connected to the lifting device 12 through connecting rods 11.

[0036] Furthermore, the heating device uses three dry-burning electric heating tubes 3 with adjustable power, which are evenly arranged above the bottom bracket and below the main rib positioning device, and is equipped with a temperature control device 7 (PID controller) with an accuracy of ±1℃ to prevent the phase change material 1 from overheating or insufficient curing.

[0037] Furthermore, the square tray 6 is made of aluminum with a thickness of 10-15mm, which has good thermal conductivity and is embedded in the top of the base bracket;

[0038] Furthermore, phase change material 1 is filled into a square tray 6, and paraffin-based composite phase change material 1 with a melting point of 60-80℃ is selected.

[0039] Furthermore, the lifting device 12 adopts a hydraulic lifting system, which is installed at both ends of the base bracket, and the lifting height is infinitely adjustable.

[0040] Furthermore, pulley 6 has a locking function; after being moved to the predetermined position, pulley 6 is locked to prevent the device from shifting during construction.

[0041] Furthermore, track 8 is made of lightweight steel rails and is fixed on both sides of the rebar cage processing platform 10, with a horizontal distance of 500mm between it and the rebar cage processing platform 10.

[0042] A construction method for precise positioning of main reinforcement bars in segmented processing of diaphragm wall steel cages, employing the aforementioned precise positioning device for main reinforcement bars in segmented processing of diaphragm wall steel cages, includes the following steps:

[0043] The first step is to lay tracks 8 on both sides of the steel cage platform and install the main reinforcement precision positioning device on the tracks 8;

[0044] The second step is to move the device to the tail position of the upper section of the cage and adjust the top elevation of the main reinforcement positioning device to be at the preset height position of the main reinforcement.

[0045] The third step is to turn on the heating device to heat the main rib positioning device, so that it changes from a solid state to a plastic state, and then maintain the temperature by the temperature control device 7.

[0046] The fourth step is to lay out the main reinforcement bars 2 of the upper section of the steel cage according to the design requirements. After the main reinforcement bar 2 located at the tail of the upper section of the steel cage is pressed into the main reinforcement bar positioning device, a concave mark 13 is formed. The heating device is turned off, and after cooling and solidification, the concave mark 13 is retained as the installation reference for the main reinforcement bars 2 of the lower section of the cage.

[0047] Step 5: Move the main reinforcement 2 to the position of the lower section of the steel cage head by moving the main reinforcement 2 through the track 8. Arrange the main reinforcement 2 according to the indentation 13 of the main reinforcement positioning device as the reference. Then complete the remaining procedures to form the steel cage according to the conventional steps.

[0048] Step 6: After the steel cage is processed, turn on the heating device to continue heating the main reinforcement positioning device, so that it changes from solid to liquid. At this time, the phase change material 1 can be restored to its initial state. Continue to operate according to the above steps to achieve reuse.

[0049] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A construction method for precise positioning of main reinforcement bars in segmented processing of diaphragm wall steel cages, employing a precise positioning device for main reinforcement bars in segmented processing of diaphragm wall steel cages, comprising a base support, a main reinforcement bar positioning device, a heating device, a temperature control device, a lifting device, a track, and pulleys; the main reinforcement bar positioning device includes a square tray and a phase change material filled therein; the heating device is disposed between the base support and the main reinforcement bar positioning device; the temperature control device is electrically connected to the heating device; the lifting device is connected to both ends of the base support for stepless adjustment of the height of the main reinforcement bar positioning device; the pulleys are installed at the bottom of the lifting device and cooperate with the track to realize the movement of the device, characterized in that... The method includes the following steps: S1. Lay tracks on both sides of the steel cage processing platform and install the main reinforcement positioning device on the tracks; S2. Move the device to the end of the upper section of the steel cage and adjust the top elevation of the main reinforcement positioning device to the preset height position of the main reinforcement; S3. Start the heating device to heat the main rib positioning device, so that the phase change material changes from solid to plastic state, and then maintain a constant temperature through the temperature control device. S4. Lay out the main reinforcement bars of the upper section of the steel cage according to the design requirements. After the main reinforcement bar at the tail of the upper section of the steel cage is pressed into the main reinforcement bar positioning device, a dent is formed. Turn off the heating device and leave the dent after the phase change material cools and solidifies. This dent will serve as the installation reference for the main reinforcement bars of the lower section of the cage. S5. Move the position of the lower section of the steel cage head of the main reinforcement positioning device by track, and lay the main reinforcement according to the indentation of the main reinforcement positioning device as a reference to complete the remaining process to form the steel cage. S6. After the steel cage is fabricated, the heating device is turned on again to heat the main reinforcement positioning device, so that the phase change material changes from solid to liquid and returns to its initial state, enabling reuse.

2. The construction method according to claim 1, characterized in that, The phase change material is a paraffin-based composite phase change material with a melting point of 60–80°C. It is in a plastic state after heating and solidifies after cooling, retaining the main rib indentation.

3. The construction method according to claim 1, characterized in that, The square tray is made of aluminum with a thickness of 10-15mm, has high thermal conductivity, and is embedded in the top of the base bracket.

4. The construction method according to claim 1, characterized in that, The heating device uses three dry-burning electric heating tubes with adjustable power, which are evenly arranged above the base bracket and below the main rib positioning device.

5. The construction method according to claim 1, characterized in that, The temperature control device is a PID controller with a temperature control accuracy of ±1°C.

6. The construction method according to claim 1, characterized in that, The base support is formed by welding two 6000-7000mm long No. 6 angle steels and two 200mm long No. 6 angle steels into a rectangular outer frame. Inside the outer frame, 45° and 135° square tubes are continuously arranged along the length direction to enhance the longitudinal rigidity of the base support. The two ends of the base support are connected to the lifting device through connecting rods.

7. The construction method according to claim 1, characterized in that, The lifting device is a hydraulic lifting system installed at both ends of the base bracket, which can realize continuous stepless adjustment of the height of the main rib positioning device.

8. The construction method according to claim 1, characterized in that, The track is a light steel rail, fixed on both sides of the rebar cage processing platform, and the horizontal distance between the track and the rebar cage processing platform is 500mm.

9. The construction method according to claim 1, characterized in that, The pulley is a pulley with a locking function. After being moved to the predetermined position, the pulley is locked to prevent the device from shifting during construction.

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