A modular automatic mold opening and closing device and use method

Abstract

The present invention relates to a modular automatic mold opening and closing device and a method for using the same. The device comprises a pair of power modules connected by vertically connected support columns. The power module comprises an integrated transmission platform, a transmission mechanism, a transverse telescopic drive assembly and a lateral template. The integrated transmission platform comprises a reserved sinking groove group, a central sinking groove and a transmission platform bottom plate. The central sinking groove is arranged at the central position of the transmission platform bottom plate, and a central driving motor is arranged on the back of the transmission platform bottom plate. The transmission mechanism comprises a transmission gear group and a central gear plate, the central gear plate is connected to the central driving motor, and the central gear plate is arranged in the central sinking groove. The transverse driving assembly comprises four transverse telescopic drives, and each transverse telescopic drive corresponds to a set of transmission modules. The lateral template comprises a high-strength aluminum alloy template, and the lateral template is provided with at least two lateral template back purlins.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a modular automatic mold opening and closing device and a use method thereof. Background Art

[0002] Traditional shaft-type structural concrete formwork construction is usually carried out manually or semi-automatically, mainly including steps such as formwork assembly, verticality and horizontality adjustment, and fixing and supporting. During the formwork assembly stage, workers need to manually assemble the formwork and ensure that the connection between the formworks is tight and accurate; check and adjust the position of the formwork through tools such as hanging wires or laser levels to ensure that its verticality and horizontality meet the requirements; use support frames and fasteners to fix the formwork in the correct position to ensure that the formwork will not move or deform during the pouring of concrete. However, this traditional formwork construction method has some obvious disadvantages, such as high labor intensity, high safety risks, precision problems, and long construction period.

[0003] Therefore, how to provide a modular automatic mold opening and closing device and a method of use to improve construction efficiency, reduce labor costs and ensure construction quality. Summary of the invention

[0004] In view of the difficulties of high labor intensity and safety risks of traditional formwork construction methods, a modular automatic opening and closing mold device and its use method are proposed. The automation of formwork construction is realized through automatic control of lateral formwork, thereby significantly improving the efficiency and safety of formwork construction and reducing construction costs.

[0005] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0006] A modular automatic mold opening and closing device comprises a pair of power modules connected by vertically connected support columns, the power module comprises an integrated transmission platform, a transmission mechanism, a transverse telescopic drive assembly, a positioning system and a lateral template, the integrated transmission platform comprises a reserved sinking groove group, a central sinking groove and a transmission platform bottom plate, the central sinking groove is arranged at the central position of the transmission platform bottom plate, and a central drive motor is arranged on the back of the transmission platform bottom plate; the transmission mechanism comprises a transmission gear group and a central gear plate, the central gear plate is connected to the central drive motor, and the central gear plate is arranged in the central sinking groove; the positioning system comprises a positioning cover plate, a positioning hole and an intelligent locking unit, the positioning cover plate is installed on the transmission platform bottom plate, the positioning cover plate is provided with a positioning hole, a limiting sleeve and a transverse drive assembly, and the free end of the transverse drive assembly is provided with a tool-type handle; the lateral template is provided with at least two lateral template back purlins, and the lateral template back purlin is connected to the transverse drive assembly through the tool-type handle.

[0007] Furthermore, the reserved sinking groove group includes reserved sinking groove one, reserved sinking groove two, reserved sinking groove three and reserved sinking groove four, which are respectively arranged around the bottom plate of the transmission platform.

[0008] Furthermore, the transmission gear group includes four transmission gears, namely transmission gear one, transmission gear two, transmission gear three and transmission gear four, which are respectively arranged in reserved groove one, reserved groove two, reserved groove three and reserved groove four, and the central gear plate is respectively meshed with the four transmission gears through the positioning shaft.

[0009] Furthermore, there are four positioning holes, which are positioning hole one, positioning hole two, positioning hole three and positioning hole four. The four positioning holes correspond one-to-one to four corresponding transmission gears, so as to accurately control and adjust the positions of the four transmission gears.

[0010] Furthermore, there are four limiting sleeves, namely limiting sleeve one, limiting sleeve two, limiting sleeve three and limiting sleeve four. A group of intelligent locking units are arranged on each of the four limiting sleeves, and upper holes and local holes are opened on each of the limiting sleeves.

[0011] Furthermore, the lateral drive components include four, each of which is equipped with a transmission module, the transmission module includes a transmission frame and a lateral rack, the transmission frame is arranged in a limiting sleeve, the lateral rack is arranged on the side of the end of the transmission frame, and a first-level limiting hole is arranged above the transmission frame.

[0012] Furthermore, it also includes an intermediate connecting sleeve, which is arranged inside the lateral telescopic drive assembly and can move telescopically forward and backward, and is used to connect the tool-type handle and the lateral template back purlin; a primary connecting hole and a secondary limiting hole are arranged above the intermediate connecting sleeve, and the secondary limiting hole is used in conjunction with the primary limiting hole on the transmission frame to achieve the matching connection between the transmission frame and the intermediate connecting sleeve and the locking control of the forward and backward movement of the intermediate connecting sleeve.

[0013] Furthermore, the intelligent locking unit includes a mounting platform, a retractor and a fastening pin. The retractor is arranged above the mounting platform, the retractor is connected to the fastening pin, and the fastening pin is inserted into the primary limiting hole and the secondary limiting hole to realize the locking and unlocking functions of the transmission frame and the intermediate connecting sleeve.

[0014] Furthermore, the tool-type handle includes a secondary connection hole, and the secondary connection hole can be used in conjunction with the primary connection hole on the intermediate connection sleeve to achieve connection between the two.

[0015] The present invention also provides a method for using the modular automatic mold opening and closing device, the method comprising the following steps:

[0016] Step S1, providing the modular automatic mold opening and closing device for standby;

[0017] Step S2, automatic extension and retraction of the lateral formwork: when the lateral formwork needs to be extended, the central drive motor is started, and the central gear plate transmits power to the transmission gear, which then drives the lateral telescopic drive assembly to move forward and backward through the lateral rack, and the four groups of lateral telescopic drive assemblies are extended synchronously; the forward and backward movement of the lateral telescopic drive assembly drives the tool-type handle and the lateral formwork back purlin connected thereto to extend or retract through the intermediate connecting sleeve, thereby realizing the extension or retraction of the lateral formwork; the lateral formwork is extended a certain distance, thereby triggering the operation of the intelligent locking unit, at which time the telescope of the intelligent locking unit controls the fastening pin to extend downward, and the fastening pin enters the upper hole and the first-level limit hole, thereby realizing the locking of the transmission frame position, and ensuring the stability and safety of the lateral formwork position.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] The present invention provides a modular automatic mold opening and closing device, which realizes rapid positioning and adjustment of the template through the efficient cooperation of the central drive motor and the transmission mechanism, reduces the time of manual intervention, and improves the operation efficiency of the whole system. The design of the transmission mechanism ensures the effective use of power, realizes the precise distribution of power through gear meshing, and reduces the loss of energy in the transmission process. The precise extension and position control of the template is realized through the automatic control system, which improves the installation speed of the template and thus speeds up the efficiency of concrete pouring. Through the coordinated use of the positioning holes and the intelligent locking unit in the positioning system, the verticality and horizontality of the template during the construction process are ensured, and the accuracy of template installation is improved.

[0020] The application of the integrated transmission platform design and intelligent control system simplifies the process of template installation and disassembly, reduces manual operation steps, and improves construction efficiency. Through the coordinated use of the lateral telescopic drive assembly and the intelligent locking unit, the precise telescopic and position control of the template is realized, the precise movement of the lateral telescopic drive assembly is ensured, and the stability and safety of the entire system are guaranteed, making the control of the entire system easier. Scientific analysis and test results show that the transmission mechanism can effectively transmit power from the central drive motor to each transmission gear, and the transmission efficiency reaches more than 95%; the verticality error of the template is less than ±1mm / m, and the horizontality error is less than ±1mm / m, which meets the high standard of precision requirements; the template system of the present invention saves about 20% of energy consumption compared with the traditional method; according to actual application cases, after adopting the template system of the present invention, the concrete pouring cycle of a single shaft structure is shortened by 30%, which significantly improves the construction efficiency. In summary, the present invention realizes the automation and intelligence of the template construction process through the application of the above-mentioned key technologies, significantly improves the construction efficiency and safety, and effectively reduces the construction cost, which has important practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the opening of the side template in the modular automatic mold opening and closing device according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the retraction of the lateral template in the modular automatic mold opening and closing device according to an embodiment of the present invention;

[0024] Figure 4 It is a bottom schematic diagram of the side template being opened in the modular automatic mold opening and closing device according to one embodiment of the present invention;

[0025] Figure 5 A front view of a modular automatic mold opening and closing device with the side mold plate opened in one embodiment of the present invention;

[0026] Figure 6 A schematic diagram of a power module of a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of a transverse driving module assembly of a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0028] Figure 8 The second schematic diagram of the transverse driving module assembly of the modular automatic mold opening and closing device according to an embodiment of the present invention;

[0029] Fig. 9A schematic diagram of an intelligent locking unit of a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0030] Fig.10 for Fig. 9 A partial enlarged view of part A;

[0031] Fig.11 A schematic diagram of a side template of a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0032] Fig.12 A schematic diagram of a reserved sink in a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0033] Fig.13 It is a schematic diagram of the installation of the transmission gear in the modular automatic mold opening and closing device according to one embodiment of the present invention;

[0034] Fig.14 It is a schematic diagram of the installation of the positioning shaft in the modular automatic mold opening and closing device according to one embodiment of the present invention;

[0035] Fig.15 A schematic diagram of a positioning hole in a modular automatic mold opening and closing device according to an embodiment of the present invention;

[0036] Fig.16 It is a schematic diagram of a limiting sleeve in a modular automatic mold opening and closing device according to an embodiment of the present invention.

[0037] In the figure:

[0038] 1-upper power module; 2-lower power module; 100-integrated transmission platform, 101-reserved sink groove one, 102-reserved sink groove two, 103-reserved sink groove three, 104-reserved sink groove four, 105-center sink groove, 106-transmission platform bottom plate; 111-transmission gear one, 112-transmission gear two, 113-transmission gear three, 114-transmission gear four, 115-center gear plate; 121-positioning shaft one, 122-positioning shaft two, 123-positioning shaft three, 124-positioning shaft four; 130-center drive motor; 140-positioning cover plate, 141-positioning hole one, 142-positioning hole two, 143-positioning hole three, 144-positioning hole four; 151-limit sleeve one, 1511-upper hole, 1512-partial hole, 152-limit sleeve 2, 153-limit sleeve 3, 154-limit sleeve 4; 200-lateral telescopic drive assembly, 210-lateral telescopic drive assembly 1, 220-lateral telescopic drive assembly 2, 230-lateral telescopic drive assembly 3, 240-lateral telescopic drive assembly 4; 211-transmission frame, 2111-first-level limiting hole, 2112-lateral rack; 212-intermediate connecting sleeve, 2121-first-level connecting hole, 2122-second-level limiting hole; 213-tool-type handle, 2131-secondary connecting hole, 2132-connecting column; 214-intelligent locking unit, 2141-mounting table, 2142-retractor, 2143-fastening pin; 300-vertical connecting support column; 400-lateral template, 401- high-strength aluminum alloy formwork, 402- upper lateral formwork back purlin, 403- lower lateral formwork back purlin. DETAILED DESCRIPTION

[0039] The following is a further detailed description of a modular automatic mold opening and closing device and a method of use provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0040] Embodiment 1

[0041] Combine the following Figures 1 to 16 , the structural composition of the modular automatic mold opening and closing device of the present invention is described in detail.

[0042] Please continue to refer to Figures 1 to 16A modular automatic mold opening and closing device includes a pair of power modules connected by vertical connecting support columns 300, which are upper power modules 1 and lower power modules 2. According to the vertical height of the lateral template 400, a power module is arranged every 3-4m. The power module includes an integrated transmission platform 100, a transmission mechanism, a lateral telescopic drive assembly 200, a positioning system and a lateral template 400. The integrated transmission platform 100 includes a reserved sinking groove group, a central sinking groove 105 and a transmission platform bottom plate 106, which constitute the basic structure of the transmission platform. The central sinking groove 105 is arranged at the central position of the transmission platform bottom plate 106 for installing the transmission mechanism. A central drive motor 130 is provided on the back of the transmission platform base plate 106, which serves as the power source of the entire transmission system; the transmission mechanism includes a transmission gear set and a central gear plate 115, which is directly or indirectly connected to the central drive motor 130, and is disposed in the central sink 105. The central gear plate 115, as the core component of the transmission mechanism, is meshed with the transmission gear of the transmission gear set to achieve effective power transmission and precise positioning and adjustment of the lateral template; the positioning system includes a positioning cover plate 140, a positioning hole and an intelligent locking unit 214, and the positioning cover plate 140 is installed on the transmission platform base plate 106 to cover and protect the transmission mechanism. The positioning cover plate 140 is provided with a positioning hole, a limiting sleeve and a transverse driving assembly, and a tool-type handle 213 is provided at the free end of the transverse driving assembly; the lateral formwork 400 is provided with at least two lateral formwork back purlins, namely an upper lateral formwork back purlin 402 and a lower lateral formwork back purlin 403, and the lateral formwork back purlin is connected to the transverse driving assembly through a tool-type handle 213.

[0043] In particular, in order to facilitate material acquisition and ensure construction quality, the lateral formwork 400 can select a high-strength aluminum alloy formwork 401.

[0044] In this embodiment, more preferably, the reserved sinking groove group includes a reserved sinking groove 1 101 , a reserved sinking groove 2 102 , a reserved sinking groove 3 103 and a reserved sinking groove 4 104 , which are respectively arranged around the bottom plate 106 of the transmission platform.

[0045] In this embodiment, more preferably, the transmission gear set includes four transmission gears, namely, transmission gear one 111, transmission gear two 112, transmission gear three 113 and transmission gear four 114, which are respectively arranged in the reserved sink groove one 101, reserved sink groove two 102, reserved sink groove three 103 and reserved sink groove four 104, and the central gear plate 115 is respectively meshed with the four transmission gears through the positioning shaft. The transmission gears of the transmission gear set are used to transmit power and realize precise motion control. There are four positioning shafts, namely, positioning shaft one 121, positioning shaft two 122, positioning shaft three 123 and positioning shaft four 124. The positioning shaft is arranged on the bottom plate 106 of the transmission platform, and is used to connect the transmission gears to ensure the rotation of the transmission gears.

[0046] In this embodiment, more preferably, there are four positioning holes, which are positioning hole one 141, positioning hole two 142, positioning hole three 143 and positioning hole four 144. The four positioning holes correspond one-to-one to the corresponding four transmission gears, so as to accurately control and adjust the positions of the four transmission gears.

[0047] In this embodiment, more preferably, there are four limiting sleeves, namely limiting sleeve one 151, limiting sleeve two 152, limiting sleeve three 153 and limiting sleeve four 154, each of the four limiting sleeves is provided with a group of intelligent locking units 214, and each of the limiting sleeves is provided with an upper hole 1511 and a local hole 1512.

[0048] In this embodiment, more preferably, the transverse drive assembly includes four, each of which is equipped with a transmission module, the transmission module includes a transmission frame 211 and a lateral rack 2112, the transmission frame 211 is arranged in a limiting sleeve, and a lateral rack 2112 is arranged on the side of the end of the transmission frame 211, and the lateral rack 2112 is used to transmit with the transmission gear to realize the forward and backward movement of the transmission frame 211. A primary limiting hole 2111 is arranged above the transmission frame 211 to limit the moving range of the transmission frame 211. The transverse telescopic drive assembly realizes the precise telescopic and position control of the lateral template, ensures the precise movement of the transverse telescopic drive assembly, and ensures the stability and safety of the entire system.

[0049] In this embodiment, more preferably, it further includes an intermediate connecting sleeve 212, which is arranged inside the transverse telescopic drive assembly and can telescopically move forward and backward, and is used to connect the tool-type handle 213 and the lateral template back purlin. A primary connecting hole and a secondary limiting hole are arranged above the intermediate connecting sleeve 212, and the secondary limiting hole is used in conjunction with the primary limiting hole on the transmission frame to achieve the matching connection between the transmission frame and the intermediate connecting sleeve and the locking control of the forward and backward movement of the intermediate connecting sleeve.

[0050] In this embodiment, more preferably, the intelligent locking unit 214 includes a mounting platform 2141, a retractor 2142 and a fastening pin 2143. The retractor 2142 is arranged above the mounting platform 2141, the retractor 2142 is connected to the fastening pin 2143, and the fastening pin 2143 is inserted through the primary limiting hole 2111 and the secondary limiting hole 2122 to realize the locking and unlocking functions of the transmission frame 211 and the intermediate connecting sleeve 212.

[0051] In this embodiment, more preferably, the tool-type handle 213 is provided with a secondary connection hole 2131, and the bolts pass through the secondary connection hole 2131 and the primary connection hole 2121 on the intermediate connection sleeve 212, respectively, to achieve the connection between the intermediate connection sleeve 212 and the tool-type handle 213. The tool-type handle 213 is also provided with a connection column 2132 for connecting the lateral formwork back purlin.

[0052] Please continue to refer to Figures 1 to 16 This embodiment also provides a method for using the modular automatic mold opening and closing device, which includes the following steps:

[0053] Step S1, providing the modular automatic mold opening and closing device for standby;

[0054] Step S2, the lateral formwork 400 automatically extends and retracts: when the lateral formwork 400 needs to be extended, the central drive motor 130 is started, and the central gear plate 115 transmits power to the transmission gear, and the transmission gear then drives the lateral telescopic drive assembly to move forward and backward through the lateral rack 2112, and the four groups of lateral telescopic drive assemblies are extended synchronously; the forward and backward movement of the lateral telescopic drive assembly drives the tool-type handle 213 and the lateral formwork back purlin connected thereto to extend or retract through the intermediate connecting sleeve 212, thereby realizing the extension or retraction of the lateral formwork 400; the lateral formwork 400 is extended a certain distance, thereby triggering the operation of the intelligent locking unit 214, at which time the telescope 2142 of the intelligent locking unit 214 controls the fastening pin 2143 to extend downward, and the fastening pin 2143 enters the upper hole 1511 and the first-level limit hole 2111, thereby realizing the position locking of the transmission frame 211, and ensuring the stability and safety of the position of the lateral formwork 400.

[0055] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A modular automatic mold opening and closing device, characterized in that: The invention comprises a pair of power modules connected by vertically connecting support columns, wherein the power module comprises an integrated transmission platform, a transmission mechanism, a transverse telescopic drive assembly, a positioning system and a lateral template, wherein the integrated transmission platform comprises a reserved sinking groove group, a central sinking groove and a transmission platform bottom plate, wherein the central sinking groove is arranged at the central position of the transmission platform bottom plate, and a central drive motor is arranged at the back of the transmission platform bottom plate; the transmission mechanism comprises a transmission gear group and a central gear plate, wherein the central gear plate is connected to the central drive motor, and the central gear plate is arranged in the central sinking groove; the positioning system comprises a positioning cover plate, a positioning hole and an intelligent locking unit, wherein the positioning cover plate is installed on the transmission platform bottom plate, wherein the positioning hole, a limiting sleeve and a transverse drive assembly are arranged on the positioning cover plate, and a tool-type handle is arranged at the free end of the transverse drive assembly; the lateral template is provided with at least two lateral template back purlins, and the lateral template back purlin is connected to the transverse drive assembly through the tool-type handle; the limiting sleeve A group of intelligent locking units are arranged on the top, and the lateral drive assembly is equipped with a set of transmission modules, the transmission module includes a transmission frame and a lateral rack, the transmission frame is arranged in a limiting sleeve, the lateral rack is arranged on the side of the end of the transmission frame, and a primary limiting hole is arranged above the transmission frame; it also includes an intermediate connecting sleeve, the intermediate connecting sleeve is arranged inside the lateral telescopic drive assembly, and can move telescopically forward and backward, and is used to connect the tool-type handle and the lateral template back purlin; a primary connecting hole and a secondary limiting hole are arranged above the intermediate connecting sleeve, and the secondary limiting hole is used in conjunction with the primary limiting hole on the transmission frame to realize the matching connection between the transmission frame and the intermediate connecting sleeve and the locking control of the forward and backward movement of the intermediate connecting sleeve; the intelligent locking unit includes a mounting platform, a telescope and a fastening pin, the telescope is arranged above the mounting platform, the telescope is connected to the fastening pin, and the fastening pin is inserted through the primary limiting hole and the secondary limiting hole to realize the locking and unlocking functions of the transmission frame and the intermediate connecting sleeve.

2. The modular automatic mold opening and closing device according to claim 1, characterized in that: The reserved sinking groove group includes reserved sinking groove one, reserved sinking groove two, reserved sinking groove three and reserved sinking groove four, which are respectively arranged around the bottom plate of the transmission platform.

3. The modular automatic mold opening and closing device according to claim 2, characterized in that: The transmission gear set includes four transmission gears, namely transmission gear one, transmission gear two, transmission gear three and transmission gear four, which are respectively arranged in reserved groove one, reserved groove two, reserved groove three and reserved groove four, and the central gear plate is meshed with the four transmission gears through the positioning shaft.

4. The modular automatic mold opening and closing device according to claim 3 is characterized in that: There are four positioning holes, which are positioning hole one, positioning hole two, positioning hole three and positioning hole four. The four positioning holes correspond to four corresponding transmission gears one by one, so as to accurately control and adjust the positions of the four transmission gears.

5. The modular automatic mold opening and closing device according to claim 4, characterized in that: There are four limiting sleeves, namely limiting sleeve 1, limiting sleeve 2, limiting sleeve 3 and limiting sleeve 4. The limiting sleeves are all provided with upper holes and partial holes.

6. The modular automatic mold opening and closing device according to claim 5, characterized in that: The lateral drive components include four.

7. The modular automatic mold opening and closing device according to claim 6, characterized in that: The tool-type handle comprises a secondary connection hole, and the secondary connection hole can be used in conjunction with the primary connection hole on the intermediate connection sleeve to achieve connection between the two.

8. The method for using the modular automatic mold opening and closing device according to any one of claims 5 to 7, characterized in that: The method of use comprises the following steps: Step S1, providing the modular automatic mold opening and closing device for standby; Step S2, automatic extension and retraction of the lateral formwork: when the lateral formwork needs to be extended, the central drive motor is started, and the central gear plate transmits power to the transmission gear, which then drives the lateral telescopic drive assembly to move forward and backward through the lateral rack, and the four groups of lateral telescopic drive assemblies are extended synchronously; the forward and backward movement of the lateral telescopic drive assembly drives the tool-type handle and the lateral formwork back purlin connected thereto to extend or retract through the intermediate connecting sleeve, thereby realizing the extension or retraction of the lateral formwork; the lateral formwork is extended a certain distance, thereby triggering the operation of the intelligent locking unit, at which time the telescoping device of the intelligent locking unit controls the fastening pin to extend downward, and the fastening pin enters the upper hole and the first-level limit hole, thereby realizing the locking of the transmission frame position, and ensuring the stability and safety of the lateral formwork position.

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