Construction method of wall formwork and wall pouring method

Abstract

The invention provides a construction method of a wall formwork and a wall pouring method.The construction method comprises the steps that firstly, a steel formwork and a truss unit with a certain width and rigidity are welded to form a single-side formwork assembly capable of being installed in a block mode, then in the hoisting state, the single-side formwork assembly is moved to the side of a wall to be poured, the wall with the poured bottom serves as a supporting point, and the single-side formwork assembly can be installed in a block mode; the first supporting mechanism is vertically installed, and the second supporting mechanism is obliquely installed to adjust the perpendicularity of the steel formwork. According to the construction method, the supporting mechanism for adjusting the perpendicularity does not need to be inserted into the reinforcement cage of the wall to be poured, and a large number of supporting mechanisms are not needed; high-precision and high-efficiency steel formwork perpendicularity control during mass concrete wall construction can be achieved only by vertically and obliquely cooperatively controlling the length-adjustable supporting mechanisms on the bottom and the outer side of the formwork assembly, operation is easy, a large amount of manpower is not needed, a large amount of wall hole plugging construction does not need to be conducted in the later period, and the construction efficiency is improved. And the construction cost and complexity are reduced.

Description

Technical Field

[0001] The invention relates to a super-large volume concrete construction technology, in particular to a wall formwork construction method and a wall casting method, belonging to the technical field of large-scale engineering construction. Background Art

[0002] With the rapid development of the construction industry, super-large buildings and large-span structures are increasing. When pouring large-volume concrete walls, the impact of the initial and final setting of concrete on the integrity of the structure must be considered. Correspondingly, how to achieve the continuous and normal operation of the casting formwork system has become more and more complicated. At present, large-volume concrete pouring mainly adopts steel formwork construction. Steel formwork has the characteristics of high strength and good rigidity. When constructing large-volume concrete walls, it can well achieve the flatness of continuous walls. However, the pouring of super-large-volume concrete wall structures usually requires multiple pourings. How to control the accuracy and verticality of multiple pourings of large-volume concrete becomes very difficult.

[0003] In the prior art, the more conventional wall formwork system is the tie steel formwork system, which mainly includes steel panels and tie rods penetrating the concrete structure. For conventional wall structures, tie rods can use the steel cage of the concrete wall to provide support and lateral tensile resistance for the formwork, have high strength, and can be used to adjust the verticality of the steel panels on both sides of the wall. However, for large-volume concrete wall construction, when a large number of tie rods are used to adjust the verticality of the steel panels, the adjustment accuracy and range of the tie rods are limited, and a large number of tie rods need to be adjusted repeatedly, which is time-consuming and labor-intensive, and the construction efficiency is low.

[0004] At the same time, the tie rods have complicated post-processing and the risk of water leakage. After the wall tie steel formwork is removed, a large number of tie bolt holes will remain, which need to be sealed. For special environments such as water storage stations and water pumping stations, it is difficult to seal the holes, and the waterproof performance is difficult to meet the waterproof performance requirements, which increases the construction difficulty and cost. In particular, after the water pumping station has been used for a period of time, the risk of water leakage at the hole sealing position will increase year by year. The efficiency of hole sealing construction is very low, and it must be repaired manually one by one, which takes a long time and affects the overall construction progress. Summary of the invention

[0005] The purpose of the present invention is to provide a wall formwork construction method and a wall casting method in view of the problems existing in the prior art. In the formwork construction method, a support mechanism for adjusting the verticality does not need to be inserted into a steel cage of a wall to be cast, and does not require a large number of support mechanisms. Only by vertically and diagonally coordinating and controlling the length-adjustable support mechanism at the bottom and outside of the formwork assembly can high-precision and high-efficiency control of the verticality of the steel formwork during large-volume concrete wall construction be achieved. The operation is simple and does not require a large amount of manpower. At the same time, the construction method does not require a large amount of wall hole sealing construction in the later stage, and the construction complexity is reduced. The method is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pumping stations.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A construction method for a wall formwork comprises the following steps:

[0008] S1, welding the steel formwork to one side of the truss unit to obtain a single-side formwork assembly;

[0009] Lift the single-sided formwork assembly to the side of the steel cage erected on the poured wall;

[0010] S2. Keep the single-side formwork assembly hoisted.

[0011] The bottom of one side of the truss unit close to the steel formwork is fixedly connected to the poured wall;

[0012] The bottom of a side of the truss unit away from the steel formwork is vertically connected and installed with a first support mechanism with adjustable length;

[0013] The middle part of the side of the truss unit away from the steel formwork is obliquely connected and installed with a second support mechanism with adjustable length;

[0014] S3. Adjust the first supporting mechanism and the second supporting mechanism to make the verticality of the steel formwork meet the design requirements, release the hoisting of the single-sided formwork assembly, and complete the construction of the single-sided wall formwork.

[0015] The present invention provides a construction method for a wall formwork. First, a steel formwork is welded to a truss unit with a certain width and rigidity to form a single-sided formwork assembly that can be installed in blocks. Then, in a hoisting state, the single-sided formwork assembly is moved to the side of the wall to be cast. The wall that has been cast at the bottom is used as a support point. A first support mechanism is vertically installed and a second support mechanism is obliquely installed to adjust the verticality of the steel formwork. Finally, the hoisting state is released to complete the construction of the single-sided wall formwork. In the construction method of the present application, the support mechanism for adjusting the verticality does not need to be inserted into the steel cage of the wall to be cast, and a large number of support mechanisms are not required. Only by vertically and obliquely coordinating the length-adjustable support mechanism at the bottom and outside of the formwork assembly can the verticality of the steel formwork be controlled with high precision and high efficiency during the construction of a large-volume concrete wall. The operation is simple and does not require a large amount of manpower. At the same time, the construction method does not need to carry out a large number of wall hole plugging construction in the later stage, and the construction complexity is reduced. It is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pump stations.

[0016] Furthermore, when constructing the first layer of wall formwork, the cast wall is the low wall built at the designed position of the wall construction, and when constructing the second layer or above of wall formwork, the cast wall is the wall below the wall to be cast.

[0017] Furthermore, the specific operation process of fixing the bottom of one side of the truss unit close to the steel formwork to the poured wall includes the following steps:

[0018] During the wall construction, a plurality of first screws are buried at intervals along the length direction of the wall;

[0019] Connecting the second screw rod to the first screw rod via a nut;

[0020] A plurality of second screw rods are respectively inserted into the reserved holes at the bottom ends of a plurality of vertical trusses on the vertical surface of the truss unit close to the steel formwork, and are fixed.

[0021] Furthermore, the specific operation process of vertically connecting and installing the bottom of a side surface of the truss unit away from the steel formwork with the first length-adjustable support mechanism includes the following steps:

[0022] Install a plurality of vertical length-adjustable first support screw mechanisms at intervals along the length direction of the truss unit at the bottom end of the side elevation of the truss unit away from the steel formwork;

[0023] One end of the first support screw mechanism is fixedly connected to the bottom end of the vertical truss of the truss unit on the facade away from the steel formwork, and the other end of the first support screw mechanism is installed on the base outside the wall to be constructed.

[0024] Furthermore, the specific operation process of obliquely connecting and installing the middle portion of the side surface of the truss unit away from the steel formwork with the second length-adjustable support mechanism includes the following steps:

[0025] Install a plurality of oblique length-adjustable second support screw mechanisms at intervals along the length direction of the truss unit at the middle of the side elevation of the truss unit away from the steel formwork;

[0026] One end of the second support screw mechanism is fixedly connected to the middle part of the vertical truss of the truss unit on the facade away from the steel formwork, and the other end of the second support screw mechanism is installed on the base outside the wall to be constructed.

[0027] Furthermore, the method includes completing the construction of two single-sided wall formworks, wherein the two single-sided wall formworks are arranged relative to each other, and a wall concrete pouring space is formed between the two single-sided wall formworks.

[0028] Furthermore, it also includes installing end formwork at both ends of the concrete pouring space, connecting the edges of the end formwork with the steel formwork and sealing them.

[0029] Furthermore, it also includes installing a pull rod on the top of the oppositely arranged truss units, and the top-installed pull rod is used to tighten the two oppositely arranged truss units.

[0030] Furthermore, it also includes: installing a ladder in the truss unit and setting up an operating platform on the top of the truss unit; the ladder is connected to the operating platform.

[0031] Another object of the present invention is to protect a wall casting method.

[0032] A wall casting method adopts the above-mentioned wall formwork construction method to set up the wall formwork, then casts concrete, and removes the wall formwork when the concrete reaches the designed strength.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. The present invention provides a construction method for a wall formwork. First, a steel formwork is welded to a truss unit with a certain width and rigidity to form a single-sided formwork assembly that can be installed in blocks. Then, in a hoisting state, the single-sided formwork assembly is moved to the side of the wall to be cast. The wall that has been cast at the bottom is used as a support point. The first support mechanism is vertically installed and the second support mechanism is obliquely installed to adjust the verticality of the steel formwork. Finally, the hoisting state is released to complete the construction of the single-sided wall formwork. In the construction method of the present application, the support mechanism for adjusting the verticality does not need to be inserted into the steel cage of the wall to be cast, and a large number of support mechanisms are not required. Only by vertically and obliquely coordinating the length-adjustable support mechanism at the bottom and outside of the formwork assembly can the verticality of the steel formwork be controlled with high precision and high efficiency during the construction of a large-volume concrete wall. The operation is simple and does not require a large amount of manpower. At the same time, the construction method does not need to carry out a large number of wall hole plugging construction in the later stage, and the construction complexity is reduced. It is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pump stations.

[0035] 2. The construction method of the present invention adopts welding of steel formwork and truss unit for the single-sided formwork assembly design to form a single-sided formwork assembly, realizes block installation, simplifies the installation process of the formwork, and improves construction efficiency.

[0036] 3. The wall formwork construction method of the present invention adopts a symmetrical structural design for the wall formwork on both sides, and uses the cast wall at the bottom as a support point to form a coordinated wall formwork as a whole. By hoisting the single-side formwork assembly to one side of the steel cage and connecting it to the outside of the steel cage, using the cast wall as the basic connection structure, the position of the formwork is controlled, so that the positioning of the formwork and the steel cage is accurate, thereby improving the wall construction accuracy.

[0037] 4. The wall formwork construction method of the present invention is to connect and install the first support mechanism and the second support mechanism vertically and obliquely respectively, thereby enhancing the support stability of the formwork and adapting to different construction conditions. It is no longer necessary to set up a full-plate scaffolding, thereby improving the convenience and efficiency of the wall formwork construction.

[0038] 5. The wall formwork construction method of the present invention utilizes hoisting to control the single-side formwork assembly, which has good safety. The two-side formwork assemblies are pulled and fixed, and the already cast wall is used as support. In combination with the tie rods on the top of the single-side formwork assembly, there is no need to set tie rods inside the wall, thereby ensuring the sealing quality of the wall integrity. There is no need to carry out a large number of wall hole plugging construction, and the construction complexity is reduced. It is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pump stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the side structure of a single-sided formwork assembly.

[0040] Figure 2It is a schematic diagram of the front view structure of the single-sided template assembly.

[0041] Figure 3 This is a schematic diagram of the construction structure of the first-layer wall formwork.

[0042] Figure 4 for Figure 3 An enlarged schematic diagram of the fixed connection between the truss unit and the low wall in part A.

[0043] Figure 5 Schematic diagram of the second-layer wall formwork construction structure.

[0044] Markings in the figure:

[0045] 1-Steel formwork;

[0046] 2-truss unit; 21-vertical truss; 211-horizontal truss; 22-ladder; 23-operating platform;

[0047] 3- Angle steel bar;

[0048] 4- low wall; 41- first screw rod; 42- second screw rod;

[0049] 5-first supporting mechanism; 6-second supporting mechanism; 7-concrete pouring space; 8-pull rod. DETAILED DESCRIPTION

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product / equipment / device is placed when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0053] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0054] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0055] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0056] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0057] The more conventional wall formwork system is the tie steel formwork system, which mainly includes steel panels and tie rods penetrating the concrete structure. For conventional wall structures, tie rods can use the steel cage of the concrete wall to provide support and lateral tensile resistance for the formwork, and have the advantages of high strength and can be used to adjust the verticality of the steel panels on both sides of the wall. However, for large-volume concrete wall construction, when a large number of tie rods are used to adjust the verticality of the steel panels, the adjustment accuracy and range of the tie rods are limited, and a large number of tie rods need to be adjusted repeatedly, which is time-consuming and labor-intensive, and the construction efficiency is low.

[0058] At the same time, the tie rods have complicated post-processing and the risk of water leakage. After the wall tie steel formwork is removed, a large number of tie bolt holes will remain, which need to be sealed. For special environments such as water storage stations and water pumping stations, it is difficult to seal the holes, and the waterproof performance is difficult to meet the waterproof performance requirements, which increases the construction difficulty and cost. In particular, after the water pumping station has been used for a period of time, the risk of water leakage at the hole sealing position will increase year by year. The efficiency of hole sealing construction is very low, and it must be repaired manually one by one, which takes a long time and affects the overall construction progress.

[0059] To this end, the present invention provides a construction method for a wall formwork:

[0060] First, the steel formwork is welded to a truss unit with a certain width and rigidity to form a single-sided formwork assembly that can be installed in blocks.

[0061] Then, in the hoisting state, move the single-sided formwork assembly to the side of the wall to be cast, use the cast wall at the bottom as the support point, vertically install the first support mechanism and diagonally install the second support mechanism to adjust the verticality of the steel formwork, and finally release the hoisting state to complete the construction of the single-sided wall formwork.

[0062] In the construction method of the present invention, the support mechanism for adjusting the verticality does not need to be inserted into the steel cage of the wall to be cast, nor does it require a large number of support mechanisms. Only by vertically and obliquely coordinating the length-adjustable support mechanism at the bottom and outside of the formwork assembly, high-precision and high-efficiency control of the verticality of the steel formwork during the construction of a large-volume concrete wall can be achieved. The operation is simple and does not require a large amount of manpower. At the same time, this construction method does not require a large number of wall hole plugging construction in the later stage, and the construction complexity is reduced. It is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pumping stations, and has achieved unexpected technical effects.

[0063] The following provides a specific implementation case for a more detailed introduction.

[0064] Example 1

[0065] A project is located in JZ Economic City. After completion, it will be used to provide cooling water for the land-based heavy industrial plant. The project mainly includes offshore HDPE water intake pipelines, onshore GRP pipelines, water intake pump stations and related ancillary buildings and facilities, with a design flow of 160,000m 3 / h. The water intake pump station is an onshore reinforced concrete structure, which is arranged in an east-west direction with the structural axis perpendicular to the coastline. The total length of the pump station is 108.6m, the height is 23m, and the total width of the pump station flow area is 38.7m.

[0066] The thickness of the wall concrete protective layer is 75mm, the vertical steel bars are arranged at a spacing of 100mm, and the horizontal bars are arranged at a spacing of 125mm. Since the water intake pump station is used in a water storage environment in the later stage, higher requirements are put forward for waterproofness during wall construction, and the super-large wall must ensure good verticality, which has a higher construction difficulty. Therefore, the conventional tension steel formwork system is not a preferred implementation scheme. For this reason, this embodiment provides the following wall formwork construction method.

[0067] The following steps are involved:

[0068] Part 1: Wall reinforcement tying

[0069] First, the construction joints should be roughened. The depth of the roughening should be controlled at 5-10mm. All the floating slurry and soft layer on the concrete surface should be removed, and most of the coarse aggregate should be exposed, with the aggregate exposed not less than 75%. After the roughening is completed, the concrete surface should be rinsed to ensure that the surface is moist and free of floating slurry and water accumulation. Before manual roughening, the concrete strength should be ensured to reach 2.5MPa. During the roughening process, the damage to the aggregate should be controlled as much as possible to avoid the loosening of the aggregate.

[0070] The wall reinforcement is tied on the steel structure construction platform. The construction platform is fixed by bolts connected to the anchor rods and round cone nuts embedded in the lower wall. A reinforcement tying frame is set above the construction platform, and a steel wire rope is used to fix the vertical reinforcement anchored in the lower wall to prevent the reinforcement tying frame from overturning during construction. A vertical ladder is set on the inside of the tying frame operation platform as a passage for personnel to go up and down. Railings and 18cm high skirting boards are set at a height of 0.6m and 1.2m on the outside of the platform to prevent personnel or construction materials and tools from falling. The steel bar load above a single 5.35m long construction platform shall not exceed 3t.

[0071] The workers set up scaffolding as the upper and lower construction platforms for the construction passage. During installation, the scaffolding and the pre-embedded round cone nuts in the wall are pulled against each other to ensure overall stability.

[0072] The wall reinforcement is constructed in the order of first connecting the vertical reinforcement and then installing the horizontal reinforcement layer by layer from bottom to top. Use a truck crane to lift and tie the reinforcement during the operation. During the tying process, pay attention to using steel pipes or steel bars to continuously support the wall reinforcement diagonally along the wall direction. The diagonal support angle is 45°~60°. At the same time, use steel bars to pull the reinforcement on both sides of the wall, with a spacing of no more than 3m to prevent the wall reinforcement from becoming unstable. The wall reinforcement is tied with epoxy ties in a plum blossom shape. After the tying is completed, the wire head should face the inside of the concrete to prevent the wire from invading the protective layer.

[0073] The steel bar connection method is a threaded sleeve mechanical connection. During construction, align the sleeve with the steel bar and then tighten it with a pipe clamp. It is strictly forbidden to use welding to connect the steel bars during the steel bar binding process. After the steel bar connection is completed, the tightening torque should meet the requirements of the following table.

[0074] Since the top of the wall reinforcement anchored in the bottom plate during the construction of the bottom plate is not processed with thread heads, this part of the wall reinforcement should be connected by overlapping, and the top of the overlapping reinforcement is threaded, and then extended with a threaded sleeve. The overlapping length of the wall reinforcement should meet the requirements of the drawings.

[0075] After the wall reinforcement is tied, install 7.5cm wide round PVC pads on the outside to ensure that the wall protection layer meets the design requirements. The pads on the outside of the wall are spaced 1.5m apart and arranged in a plum blossom pattern.

[0076] Part 2 Steel Formwork System Construction

[0077] The wall of the water intake pump station adopts a truss steel formwork system with a height of 4m and a maximum length of 5.35m. The formwork panel adopts 6mm steel plate; the secondary beam adopts 8[channel steel, 5.35m long, except for the spacing of the two secondary beams at the bottom (edge ​​to edge) of 0.4 and the spacing of the two secondary beams at the top (edge ​​to edge) of 0.2, the remaining secondary beams are arranged at an equal spacing of 0.5m, totaling 7; the vertical ribs adopt "0.06m (height) × 0.005m (thickness)" flat steel, and are arranged at an equal spacing of 0.4m in the horizontal direction; the vertical inner chord of the truss adopts double-jointed 8][channel steel, and the outer chord adopts double-jointed 6.3][channel steel (spacing 0.063m), with a length of 4.2m (0.1m beyond the panel at the top and bottom), and is arranged at a spacing of "0.3m+0.95m×5+0.3m" (center to center) in the horizontal direction, totaling 6 pairs. The web members of the truss are divided into two specifications: the bottom three are made of double-jointed 6.3][channel steel, and the rest are 6.3[channel steel. A 10.9-grade high-strength bolt (M30) is set at the bottom and top of the inner chord of the truss. An operating platform is set on the top of the formwork, paved with a 0.003m thick patterned steel plate, and the height of the attached railing is 1.2m.

[0078] The specific steps are as follows:

[0079] S1, such as Figure 1 and Figure 2 As shown, the steel formwork 1 is welded to one side of the truss unit 2 to obtain a single-sided formwork assembly.

[0080] In some embodiments, a plurality of spaced angle steel bars 3 are further provided between the steel formwork 1 and the truss unit 2. In some embodiments, the truss unit 2 is a frame having a certain thickness formed by erecting a plurality of vertical trusses 21 and horizontal trusses 211.

[0081] Hoist the single-sided formwork assembly above the poured wall and to the side of the erected reinforcement cage; construct the first layer of wall, starting from the low wall 4 that has been built at the designed construction position of the bottom slab wall.

[0082] S2. Keep the single-side formwork assembly hoisted.

[0083] like Figure 3 The bottom of one side of the truss unit 2 close to the steel formwork 1 is fixedly connected to the cast wall (in the first layer, the cast wall is the low wall 4); in some embodiments, Figure 4 As shown, during the wall construction, a plurality of first screw rods 41 are buried at intervals along the length direction of the wall; the second screw rods 42 are connected to the first screw rods 41 through nuts; and the plurality of second screw rods 42 are respectively inserted into the reserved holes at the bottom ends of a plurality of vertical trusses 21 on the vertical surface of the truss unit 2 close to the steel formwork 1, and fixed.

[0084] The bottom of the side surface of the truss unit 2 away from the steel formwork 1 is vertically connected and installed with the first length-adjustable support mechanism 5; in some embodiments, a plurality of vertical length-adjustable first support screw mechanisms are installed at intervals along the length direction of the truss unit 2 at the bottom end of the side facade of the truss unit 2 away from the steel formwork 1; one end of the first support screw mechanism is fixedly connected to the bottom end of the vertical truss 21 of the side facade of the truss unit 2 away from the steel formwork 1, and the other end of the first support screw mechanism is installed on the base outside the wall to be constructed.

[0085] The middle part of the side surface of the truss unit 2 away from the steel formwork 1 is obliquely connected and installed with the second length-adjustable supporting mechanism 6; in some embodiments, the following steps are included: a plurality of oblique length-adjustable second supporting screw mechanisms are installed at intervals along the length direction of the truss unit at the middle part of the side elevation of the truss unit 2 away from the steel formwork 1; one end of the second supporting screw mechanism is fixedly connected to the middle part of the vertical truss 21 of the side elevation of the truss unit 2 away from the steel formwork 1, and the other end of the second supporting screw mechanism is installed on the base outside the wall to be constructed.

[0086] S3, adjusting the first supporting mechanism 5 and the second supporting mechanism 6 so that the verticality of the truss unit 2 meets the design requirements, releasing the hoisting of the single-sided formwork assembly, and completing the construction of the single-sided wall formwork.

[0087] In some embodiments, when the length of the wall is relatively large, the single-side formwork of the wall can be divided into several blocks for construction, and the steel formworks 1 of two adjacent single-side formworks of the wall are fastened and connected.

[0088] S4, including completing the construction of two single-sided wall formworks, the two single-sided wall formworks are arranged relatively, and a concrete pouring space 7 of the wall is formed between the two single-sided wall formworks.

[0089] The subsequent wall formwork installation process is roughly the same as the first layer of wall formwork, but the working platform should be installed in advance. The working platform is connected to the lower wall through a round cone nut pre-embedded in the wall. Figure 5As shown, the installed working platform is the lowest triangular cattle rack platform.

[0090] When building the wall formwork above the second layer, the wall below the already cast wall, i.e. the wall to be cast, is used as the installation point of the wall formwork. When casting the lower wall, the installation mechanism has been pre-buried on the top of the lower wall. Figure 5 shown.

[0091] After the template is installed, check whether the fasteners and bolts are firm, whether the template joints and bottom are tight, and go through the pre-inspection procedures. The template joints must be tight and leak-proof, the inside of the template should be clean, and the template isolation agent should be evenly applied without contaminating the steel bars.

[0092] In some embodiments, the end formwork is installed at both ends of the concrete pouring space, and the edge of the end formwork is connected to the steel formwork 1 and closed. In this embodiment, the wall end formwork is closed with a wooden formwork, and 10cm×10cm wooden squares are vertically arranged on the back of the wooden formwork as back ribs, arranged at intervals of 50cm; 8[channel steels are arranged behind the vertical wooden squares as horizontal supports, with a spacing of 0.5m.

[0093] In some embodiments, a tie rod 8 is installed on the top of the oppositely arranged truss units 2, and the tie rod 8 installed on the top is used to tighten the two oppositely arranged truss units 2. In this embodiment, holes are opened on both sides of the channel steel and 16mm precision rolled threaded steel is used to pull and fix it to the wall formwork.

[0094] In some embodiments, a ladder 22 is installed in the truss unit 2 , and an operating platform 23 is set up on the top of the truss unit 2 ; the ladder 22 is connected to the operating platform 23 .

[0095] After the formwork is installed, the quality inspection department and the owner should be contacted for acceptance in a timely manner. Concrete can be poured only after the acceptance is completed. When the concrete reaches the designed strength, the wall formwork is removed.

[0096] By adopting the wall formwork construction method provided by the present invention, the support mechanism for adjusting the verticality does not need to be inserted into the steel cage of the wall to be cast, nor does it require a large number of support mechanisms. Only by vertically and obliquely coordinating the length-adjustable support mechanism at the bottom and outside of the formwork assembly, high-precision and high-efficiency control of the verticality of the steel formwork during the construction of a large-volume concrete wall can be achieved. The operation is simple and does not require a large amount of manpower. At the same time, this construction method does not require a large number of wall hole plugging construction in the later stage, and the construction complexity is reduced. It is particularly suitable for the waterproof and anti-seepage requirements of special environments such as water intake pumping stations.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a wall formwork, characterized in that: The following steps are involved: S1, welding the steel formwork (1) to one side of the truss unit (2) to obtain a single-side formwork assembly; Lift the single-sided formwork assembly to the side of the steel cage erected on the poured wall; S2. Keep the single-side formwork assembly hoisted. The bottom of one side of the truss unit (2) close to the steel formwork (1) is fixedly connected to the poured wall; The bottom of a side surface of the truss unit (2) away from the steel formwork (1) is vertically connected and installed with a first support mechanism (5) with adjustable length; The middle part of a side surface of the truss unit (2) away from the steel formwork (1) is obliquely connected and installed with a second support mechanism (6) with adjustable length; S3, adjusting the first supporting mechanism (5) and the second supporting mechanism (6) so that the verticality of the steel formwork (1) meets the design requirements, releasing the hoisting of the single-sided formwork assembly, and completing the construction of the single-sided wall formwork.

2. The construction method of the wall formwork according to claim 1, characterized in that: When constructing the first layer of wall formwork, the cast wall is the low wall (4) built at the wall construction design position, and when constructing the second layer or higher of wall formwork, the cast wall is the wall below the wall to be cast.

3. The construction method of the wall formwork according to claim 2, characterized in that: The specific operation process of fixing the bottom of one side of the truss unit (2) close to the steel formwork (1) to the poured wall comprises the following steps: During the wall construction, a plurality of first screw rods (41) are buried at intervals along the length direction of the wall; Connecting the second screw rod (42) to the first screw rod (41) via a nut; A plurality of second screw rods (42) are respectively inserted into the reserved holes at the bottom ends of a plurality of vertical trusses (21) on one side of the truss unit (2) close to the steel formwork (1) and fixed.

4. The construction method of the wall formwork according to claim 3, characterized in that: The specific operation process of vertically connecting and installing the bottom of a side surface of the truss unit (2) away from the steel formwork (1) with the first length-adjustable support mechanism (5) comprises the following steps: Installing a plurality of vertical length-adjustable first support screw mechanisms at intervals along the length direction of the truss unit (2) at the bottom end of the side elevation of the truss unit (2) away from the steel formwork (1); One end of the first support screw mechanism is fixedly connected to the bottom end of the vertical truss (21) of the truss unit (2) on the side of the facade away from the steel formwork (1), and the other end of the first support screw mechanism is installed on a base outside the wall to be constructed.

5. The construction method of the wall formwork according to claim 4, characterized in that: The specific operation process of obliquely connecting and installing the middle part of the side surface of the truss unit (2) away from the steel formwork (1) with the second support mechanism (6) with adjustable length comprises the following steps: Installing a plurality of oblique length-adjustable second support screw mechanisms at intervals along the length direction of the truss unit (2) at the middle of the side elevation of the truss unit (2) away from the steel formwork (1); One end of the second support screw mechanism is fixedly connected to the middle of the vertical truss (21) on the side of the truss unit (2) away from the steel formwork (1), and the other end of the second support screw mechanism is installed on a base outside the wall to be constructed.

6. The construction method of the wall formwork according to any one of claims 1 to 5, characterized in that: The method includes completing the construction of two single-sided wall formworks, wherein the two single-sided wall formworks are arranged relative to each other, and a concrete pouring space (7) for the wall is formed between the two single-sided wall formworks.

7. The construction method of the wall formwork according to claim 6, characterized in that: The method also includes installing end templates at both ends of the concrete pouring space (7), connecting the edges of the end templates to the steel template (1) and sealing them.

8. The construction method of the wall formwork according to claim 7, characterized in that: It also includes a pull rod (8) installed on the top of the oppositely arranged truss units (2), and the top-installed pull rod (8) is used to tighten the two oppositely arranged truss units (2).

9. The construction method of the wall formwork according to claim 8, characterized in that: The method further comprises installing a ladder (22) in the truss unit (2), and setting up an operating platform (23) on the top of the truss unit (2); the ladder (22) is connected to the operating platform (23).

10. A wall casting method, characterized in that: The wall formwork is erected by using the wall formwork construction method described in any one of claims 1 to 9, and then concrete is poured. When the concrete reaches the designed strength, the wall formwork is removed.

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