Narrow deformation joint hoisting forming steel formwork and aluminum formwork combined layer construction method

Abstract

The present application relates to a kind of narrow deformation joint hoisting forming steel formwork and aluminum formwork combined construction method, construction process flow is steel formwork processing→steel formwork hoisting→steel formwork reinforcement→formwork checking, using recyclable forming steel formwork instead of traditional plywood and foam board as deformation joint shear wall formwork, its concept is to use forming steel formwork to set up download deformation joint shear wall formwork and traditional deformation joint formwork reinforcement mode, concrete forming quality is good, and expansion mold, leakage and other conditions are very few.Recyclable forming steel formwork and aluminum formwork combined construction formwork speed is fast, formwork turnover times are more, reduce labor input, reduce construction cost and safety hazard, while eliminating the use of foam board, conducive to environmental protection.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a method for constructing narrow expansion joints using a combination of hoisted steel formwork and aluminum formwork on the same floor. Background Technology

[0002] Currently, aluminum alloy formwork is widely used in the construction of standard floors of high-rise residential buildings to improve construction efficiency and the appearance quality of the poured concrete. To achieve the goals of construction progress and resource conservation in high-rise buildings, aluminum alloy formwork employs a quick-release formwork system, reducing the construction cycle of a standard floor to 4 days. The introduction of climbing formwork systems allows for better implementation of assembly line construction, accelerating construction speed and reducing construction operation and management costs.

[0003] However, due to the limited space at the expansion joints of the standard floor of the main structure, the installation and removal of formwork at the expansion joints are extremely difficult and dangerous, leading to delays in the construction period and economic losses.

[0004] Currently, the common construction method is to first pour the concrete for one wall, then seal the other wall with formwork on one side, and add extruded polystyrene boards at the expansion joint before pouring the concrete again. However, insufficient reinforcement of the post-poured wall leads to significant manpower and resources being spent later on resolving quality issues such as grout leakage, formwork bulging, and formwork bursting. Therefore, proposing a method for constructing narrow expansion joints using a combination of hoisted fixed steel formwork and aluminum formwork on the same floor is of great significance in addressing the problems of difficult and inefficient installation and dismantling of aluminum formwork at expansion joints, as well as poor quality. Based on this, it is necessary to research a method for constructing narrow expansion joints using a combination of hoisted fixed steel formwork and aluminum formwork on the same floor. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a method for constructing narrow expansion joints by combining fixed steel formwork and aluminum formwork on the same floor. This method effectively solves the problems of difficult reinforcement of shear wall formwork, difficult demolding, poor concrete forming effect, and staggered construction at narrow expansion joints, thereby accelerating the overall construction speed and improving the construction quality.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a method for constructing a combination of fixed steel formwork and aluminum formwork on the same floor at narrow expansion joints, comprising the following steps;

[0007] Step 1: Steel formwork fabrication

[0008] According to the size of the construction surface of the expansion joint, cut or assemble steel formwork of the corresponding size, open screw holes corresponding to the aluminum formwork in the middle area of ​​the steel formwork, and open pin holes on its side.

[0009] Step 2, assembling the positioning base

[0010] The positioning seat includes a pad and a positioning post. The center of the pad is fixed at the screw hole of the steel template and is provided with a positioning hole that matches the size of the screw hole. The positioning post is fixed in the middle area of ​​the pad and is provided with a threaded hole that matches the positioning hole.

[0011] Step 3, Back Rib Assembly

[0012] Using the positioning post as a fixed base, back ribs are fixed on both sides of the positioning post;

[0013] Step 4: Rebar tying and aluminum formwork construction

[0014] After the shear wall reinforcement is tied and accepted, the inner aluminum formwork is first closed, and PVC pipes are pre-coated on the fastening bolts before screwing them into the aluminum formwork fastening bolts.

[0015] Step 5: Hoisting the steel formwork

[0016] The steel formwork was hoisted into place using a tower crane in conjunction with manual labor.

[0017] Step Six: Reinforcement of Steel Formwork

[0018] After hoisting the steel formwork at the expansion joint into place, first screw the fastening bolts into the steel formwork nuts, and tighten the fastening bolts from the aluminum film side; then seal the column head formwork, first insert the pins according to the screw hole positions, insert the wedges from top to bottom, and then use through-wall bolts to connect the head formwork with the steel formwork and aluminum formwork, and install diagonal braces on the inside to fix the shear wall aluminum formwork;

[0019] Step 7, Template Verification

[0020] At the top corner of the wall formwork, a fixed plumb bob is dropped freely, with the tip of the plumb bob aligned with the verticality control line of the floor. If there is any deviation, it is adjusted by adjusting the diagonal brace until the tip of the plumb bob coincides with the reference control line. After the verticality and expansion joint dimensions are checked and meet the requirements of the drawings and specifications, the next process is carried out.

[0021] After the steel formwork is removed, it will be lifted and hoisted to the next floor by a tower crane for construction.

[0022] Furthermore, the steel template is a spliced ​​structure, with adjacent steel templates assembled through splice seams and fixed together by welding.

[0023] Furthermore, the pad is a block-shaped structure, the positioning post is a nut, the nut is fixedly welded to the pad, the pad is welded to the steel template, and the screw hole corresponds to the threaded hole and the positioning hole.

[0024] Furthermore, there is a clearance zone on the steel formwork, and the steel formwork on both sides of the clearance zone is connected by reinforcing rods.

[0025] Furthermore, the back rib is a steel reinforcement structure, which is arranged laterally on both sides of the positioning column and extends outwards towards the steel formwork.

[0026] Furthermore, a limiting zone is formed between the two steel reinforcement structures, and a corresponding back rib is set on the side of the aluminum formwork. The two back ribs are fastened together by tensioning bolts and U-shaped clamps.

[0027] Furthermore, an adjustment seat is provided on the ground, and a positioning groove is provided on the adjustment seat. The positioning groove has an inclined surface that gradually slopes towards the aluminum template side from the outside to the inside. A positioning block is provided on the side of the steel template. The positioning block is provided with a guide platform that matches the inclined surface. The positioning block is adapted to sit in the positioning groove and can slide downward and inward along the inclined surface of the positioning groove, so that the steel template is close to the aluminum template.

[0028] Furthermore, the lower part of the adjusting seat is provided with a telescopic rod and a fixed seat. The fixed seat is fixed to the ground, and the telescopic rod is a telescopic adjustment structure that adjusts the vertical height of the adjusting seat.

[0029] Furthermore, the positioning groove is an isosceles trapezoidal shape.

[0030] Furthermore, positioning grooves are provided on both sides of the adjustment seat.

[0031] The beneficial effects of the above technical solution are as follows: This invention uses reusable prefabricated steel formwork instead of traditional plywood and foam board as shear wall formwork at expansion joints, which has the advantages of good concrete forming quality, high safety guarantee, fast formwork erection speed, and very few cases of formwork bulging and grout leakage; at the same time, the steel formwork can be reused many times, reducing construction costs; and the elimination of the use of foam board and plywood is beneficial to environmental protection.

[0032] This invention utilizes prefabricated steel formwork to support shear wall formwork at narrow expansion joints. Compared with traditional expansion joint formwork reinforcement methods, this method results in better concrete forming quality and minimizes issues such as bulging and grout leakage. The combination of reusable prefabricated steel formwork and aluminum formwork allows for faster formwork support, more frequent formwork reuse, reduced labor input, lower construction costs, and reduced safety hazards.

[0033] This invention is applicable to the construction of shear walls on both sides of narrow expansion joints using aluminum formwork on the same floor, as well as other locations where it is difficult to erect formwork. Structurally, this invention uses thin, high-strength steel plates to support the inner side of narrow expansion joints, making construction of narrow joints possible and facilitating the construction of expansion joints in narrow locations. For this construction situation, this invention arranges reinforcing steel back ribs on the outer side of the steel plate. These back ribs further strengthen the structural strength of the steel plate and apply a fastening force from the outside. Combined with pins arranged on the edge of the steel plate and connected to the aluminum formwork, a secure combination of the steel formwork and the existing aluminum formwork is achieved.

[0034] Meanwhile, to facilitate the lowering of the steel formwork, this invention includes an adjustment seat on the ground. This adjustment seat structure allows the inclined surface of the positioning groove to provide a driving force for the steel formwork to gradually move towards the aluminum formwork during its descent. This not only positions the steel formwork vertically but also horizontally, eliminating the need for manual traction on-site and improving the efficiency of lowering the steel formwork. Furthermore, after lowering, the positioning block fits perfectly into the positioning groove, ensuring precise positioning of the steel formwork and facilitating the tightening of bolts and pins, greatly improving construction efficiency and providing convenience.

[0035] This invention ensures the overall rigidity of the steel formwork by incorporating steel templates, back braces, screw holes, bolt holes, and lifting rings. This solves the problem of construction workers being unable to access and reinforce the formwork due to narrow expansion joints. It also allows for the reuse of the formwork, offering advantages such as reusability and ease of construction. This effectively reduces common quality defects in shear walls at narrow expansion joints. Furthermore, it allows for same-floor construction, reducing safety hazards associated with staggered-floor construction and enhancing the overall project appearance. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the splicing structure of the steel formwork;

[0037] Figure 2 This is a schematic diagram of the overall structure of the steel formwork;

[0038] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0039] Figure 4 This is a side view of the structure of the present invention;

[0040] Figure 5 This is a schematic diagram of the tension structure between the reinforcing bar back rib and the aluminum formwork;

[0041] Figure 6 This is a schematic diagram of the adjustment seat.

[0042] Attached diagram labels: 1 for steel formwork, 2 for screw hole, 3 for pin hole, 4 for lifting ring, 5 for clearance area, 6 for pad, 7 for positioning column, 8 for back rib, 9 for fastening screw, 10 for expansion joint, 11 for steel reinforcement frame, 12 for aluminum formwork, 13 for reinforcing rod, 14 for column head formwork, 15 for pin, 16 for wedge, 17 for secondary rib, 18 for main rib, 19 for tensioning screw, 20 for adjusting seat, 21 for positioning groove, 22 for positioning block, 23 for telescopic rod, 24 for fixing seat. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0044] Example 1: This example aims to provide a method for constructing narrow expansion joints using a combination of hoisted, standardized steel formwork and aluminum formwork on the same floor. This example is applicable to the construction of shear walls on both sides of narrow expansion joints using aluminum formwork on the same floor, as well as other locations where it is difficult to erect formwork. It is mainly used for side support of the expansion joint. Addressing the existing problems of difficult reinforcement, difficult demolding, poor concrete forming effect, and staggered construction of shear wall formwork at narrow expansion joints, this example provides a method for constructing narrow expansion joints using a combination of hoisted, standardized steel formwork and aluminum formwork on the same floor, thereby accelerating the overall construction speed and improving construction quality.

[0045] The basic construction process in this embodiment is steel formwork fabrication → steel formwork hoisting → steel formwork reinforcement → formwork verification. The concept lies in using prefabricated steel formwork for simultaneous construction of shear wall formwork at expansion joints, which, compared to traditional expansion joint formwork reinforcement methods, results in better concrete forming quality and minimizes issues such as bulging and grout leakage. The combination of reusable prefabricated steel formwork and aluminum formwork for simultaneous construction allows for faster formwork erection, more formwork reuse, reduced labor input, lower construction costs and safety hazards, and eliminates the use of foam boards, thus benefiting environmental protection.

[0046] like Figure 1-6 The article demonstrates a construction method for using a combination of fixed steel formwork and aluminum formwork in narrow expansion joints on the same floor, which includes the following steps;

[0047] Step 1: Fabrication of steel formwork 1

[0048] like Figure 1-2 As shown in the diagram, steel formwork 1 of corresponding size is cut or assembled according to the size of the construction surface of the expansion joint. Screw holes 2 corresponding to the aluminum formwork are opened in the central area of ​​the steel formwork 1, and pin holes 3 are opened on its sides. For example, in this embodiment, the steel formwork 1 is processed into a standardized formwork in the factory, and the formwork size matches the wall size at the expansion joint of each building. Based on the design drawings of the aluminum formwork 12, Φ16.5 pin holes 3 and Φ20 screw holes 2 are opened at corresponding positions on the steel plate. For ease of transportation, the entire steel plate can be cut into several small pieces, transported to the site, and then welded together as a whole.

[0049] In further implementation structures, such as Figure 2 As shown in the figure, the steel formwork 1 is a spliced ​​structure. Adjacent steel formwork 1 are assembled through splicing seams and fixed together by welding. There is an avoidance area 5 on the steel formwork 1, and the steel formwork 1 on both sides of the avoidance area 5 is connected by reinforcing rods 13.

[0050] Step 2, assembling the positioning base

[0051] like Figure 2As shown, the positioning seat includes a pad 6 and a positioning post 7. The center of the pad 6 is fixed at the screw hole 2 of the steel template 1, and a positioning hole adapted to the size of the screw hole 2 is provided. The positioning post 7 is fixed in the middle area of ​​the pad 6 and a threaded hole adapted to the positioning hole is provided. The pad 6 has a block-shaped structure, and the positioning post 7 is a nut. The nut is fixedly welded to the pad 6. The pad 6 is welded to the steel template 1, so that the screw hole 2 corresponds to the threaded hole and the positioning hole.

[0052] Two Φ25 steel bars are welded horizontally along the bolt holes 2 on the back of the steel formwork 1. A 50mm*50mm pad 6 is welded at the corresponding position of the bolt holes 2. A Φ20 hole is made in the center of the pad 6, and a nut is welded on the pad 6. Two Φ20 lifting rings are welded to the top of the steel formwork 1 to facilitate the overall lifting by the tower crane.

[0053] Step 3, Back Rib Assembly

[0054] like Figure 5 As shown in the diagram, positioning column 7 serves as the fixed foundation, with back ribs 8 fixed on both sides of positioning column 7. The back ribs 8 are steel reinforcement structures, arranged laterally on both sides of positioning column 7 and extending outwards towards the steel formwork 1. A limiting zone is formed between the two steel reinforcement structures, and a corresponding back rib is provided on the aluminum formwork side. This side back rib is as follows... Figure 4 The diagram shows a main rib 18 and a secondary rib 17. The back ribs on both sides are fastened together by tensioning screws 19 and U-shaped clips. In this embodiment, the back ribs 8 extending outward from the steel template 1 are used as the base to establish a tensioning relationship between the main ribs and the secondary ribs of the aluminum template.

[0055] Step 4: Rebar tying and aluminum formwork construction

[0056] like Figure 3 The demonstration shows that after the shear wall reinforcement is tied and inspected, the inner aluminum formwork 12 is first sealed, and PVC pipes are pre-inserted onto the fastening bolts 9 before screwing them into the aluminum formwork fastening bolts 9. The aluminum formwork 12 must be coated with an oil-based release agent. An oil-based release agent must be applied every 20 floors. Water must not be poured before pouring concrete, especially when applying a water-based release agent. When applying the release agent, the reinforcement and concrete joints must not be contaminated. During the demolding, moving, assembling, and alignment of the formwork, close observation and careful operation are required to prevent bumps, friction, pulling (topping) and cracking of the demolded concrete, which could cause defects such as chips, scratches, and cracks.

[0057] Step 5, hoisting steel formwork 1

[0058] The steel formwork 1 was hoisted into place using a tower crane and manual labor. Lifting rings 4 were also installed on the steel formwork to facilitate the hoisting process.

[0059] Step 6: Reinforce steel formwork 1

[0060] like Figure 4As shown in the diagram, after the steel formwork 1 at the expansion joint is hoisted into place, the fastening screw 9 is first screwed into the nut of the steel formwork 1, and the fastening screw 9 is tightened from the aluminum film side; then the column head formwork 14 is sealed, first the pins 15 are inserted according to the screw hole positions, the wedges are inserted from top to bottom, and then the end formwork 14 is connected to the steel formwork 1 and the aluminum formwork with through-wall bolts, and the shear wall aluminum formwork is fixed by installing diagonal braces on the inside;

[0061] Step 7, Template Verification

[0062] At the top corner of the wall formwork, a fixed plumb bob is dropped freely, with the tip of the plumb bob aligned with the verticality control line of the floor. If there is any deviation, it is adjusted by adjusting the diagonal brace until the tip of the plumb bob coincides with the reference control line. After the verticality and expansion joint dimensions are checked and meet the requirements of the drawings and specifications, the next process is carried out. After the steel formwork 1 is removed, it is lifted and hoisted to the upper floor by a tower crane for construction.

[0063] This embodiment describes a formwork system and construction method for the same-floor construction of shear walls on both sides at a narrow expansion joint. The formwork system includes a 5mm thick steel formwork 1 as the outer formwork, a 4mm thick aluminum formwork as the inner formwork, and a 50×50×3.0mm square steel back rib used in conjunction with the aluminum formwork as the main keel.

[0064] Both steel formwork 1 and aluminum formwork are reinforced with back bracing to ensure the rigidity of the entire formwork system. The back bracing is welded to steel formwork 1 for easy overall lifting and hoisting. Holes of the same size are drilled on the corresponding steel formwork 1 according to the opening positions of the aluminum formwork. The screw holes are 16.5mm in size for inserting pins, and the bolt holes are 20mm in size for inserting fixing bolts. Nuts are welded to the openings in the steel plates for inserting tie rods from the floor working surface for fixing. The main keel uses a single-sided steel structure, with no fewer than 5 keels installed along the wall height. The outer surface of the inner formwork is fixed with inner keels, and the outer surface of the outer formwork is fixed with outer keels; the inner and outer keels are fixedly connected by tie rods. The joints between the steel plates and aluminum formwork are fixed with pins.

[0065] To facilitate transportation, steel formwork 1 can be cut into small pieces at the factory according to the dimensions of the shear wall, and then transported to the construction site where professional welders will assemble and weld them into a whole. Two Φ20 lifting rings are welded to the top of steel formwork 1 to facilitate overall lifting by the tower crane.

[0066] Weld and assemble the steel formwork 1 for the shear wall on the other side according to the mirror image results.

[0067] When dismantling the formwork, use a tower crane to stabilize the steel formwork 1, knock off the pins, and unscrew the tie rods from the working surface of the floor. After the steel formwork 1 separates from the concrete, use the tower crane to lift the steel formwork 1 to the next floor for construction.

[0068] This patent can prevent construction workers from being unable to enter and install and reinforce the formwork due to the narrowness of the expansion joint. It can also realize the reuse of the formwork, and has the characteristics of being reusable and convenient for construction. It can effectively reduce the occurrence of common quality problems of shear walls at narrow expansion joints.

[0069] This embodiment is highly applicable and can be widely used in the same-floor construction of narrow expansion joints in various construction projects. By setting up steel formwork 1, the problem of construction personnel being unable to enter to install and reinforce the formwork due to the narrowness of the expansion joint is solved. It also allows for the reuse of the formwork, featuring reusability and convenient construction, which can effectively reduce the occurrence of common quality defects in shear walls at narrow expansion joints. At the same time, it allows for same-floor construction, reducing the safety hazards caused by staggered construction and improving the overall project image.

[0070] This embodiment uses reusable prefabricated steel formwork 1 instead of traditional plywood and foam board as shear wall formwork at expansion joints. It has the advantages of good concrete forming quality, high safety guarantee, fast formwork erection speed, and very few cases of formwork bulging and grout leakage. At the same time, the steel formwork 1 can be reused many times, reducing construction costs. It also eliminates the use of foam board and plywood, which is beneficial to environmental protection.

[0071] As an example, this embodiment provides a cost-benefit comparison table of using reusable prefabricated steel formwork 1 instead of traditional plywood and foam board. Taking Building 1 of the Houzhai Old Town Resettlement Area (Plot 16-012-K08-03) construction project as an example, see the table below for details.

[0072]

[0073] As shown in the table above, replacing traditional plywood and foam board with reusable prefabricated steel formwork 1 for shear wall formwork at narrow expansion joints reduces costs by 48,794.74 yuan per building, a reduction of 96%. In the Houzhai Old Town Resettlement Area (Plot 16-012-K08-03) project, with a total construction area of ​​approximately 114,400 square meters, all three main residential buildings used reusable prefabricated steel formwork 1 instead of plywood and foam board during the main construction phase, resulting in an overall cost reduction of approximately 146,400 yuan, achieving significant economic benefits.

[0074] Example 2 further illustrates the lower configuration of the steel formwork 1.

[0075] In this embodiment, as shown... Figure 6 As shown in the diagram, an adjustment seat 20 is also provided on the ground. The adjustment seat 20 is provided with a positioning groove 21. The positioning groove 21 has an inclined surface that gradually slopes towards the aluminum template side from the outside to the inside. A positioning block 22 is provided on the side of the steel template 1. The positioning block 22 is provided with a guide platform that matches the inclined surface. The positioning block 22 is adapted to sit in the positioning groove 21 and can slide downward and inward along the inclined surface of the positioning groove 21, so that the steel template 1 is close to the aluminum template 12.

[0076] The lower part of the adjusting seat 20 is equipped with a telescopic rod 23 and a fixed seat 24. The fixed seat is fixed to the ground. The telescopic rod 23 is a telescopic adjustment structure that adjusts the vertical height of the adjusting seat 20. The positioning groove is an isosceles trapezoidal shape. Positioning grooves are provided on both sides of the adjusting seat 20 to facilitate construction on both sides, making construction convenient.

[0077] In this embodiment, to facilitate the lowering of the steel formwork 1, an adjustment seat 20 is arranged on the ground. Through the structure of the adjustment seat 20, the inclined surface of the positioning groove provides a driving force for the steel formwork 1 to gradually move towards the aluminum formwork during the lowering process. It can not only position the vertical position of the steel formwork 1, but also its horizontal position. No manual traction is required on the construction site, which improves the lowering efficiency of the steel formwork 1. After the lowering is completed, the positioning block can be fitted into the positioning groove, and the lowering position of the steel formwork 1 is accurate, which facilitates the construction of fastening screws and pins, greatly improving the construction efficiency and providing convenience to people.

Claims

1. A method for constructing narrow expansion joints using a combination of suspended steel and aluminum formwork on the same floor, characterized in that: Includes the following steps; Step 1: Steel formwork fabrication According to the size of the construction surface of the expansion joint, cut or assemble steel formwork of the corresponding size, open screw holes corresponding to the aluminum formwork in the middle area of ​​the steel formwork, and open pin holes on its side. Step 2, assembling the positioning base The positioning seat includes a pad and a positioning post. The center of the pad is fixed at the screw hole of the steel template and is provided with a positioning hole that matches the size of the screw hole. The positioning post is fixed in the middle area of ​​the pad and is provided with a threaded hole that matches the positioning hole. Step 3, Back Rib Assembly Using the positioning post as a fixed base, back ribs are fixed on both sides of the positioning post; Step 4: Rebar tying and aluminum formwork construction After the shear wall reinforcement is tied and accepted, the inner aluminum formwork is first closed, and PVC pipes are pre-coated on the fastening bolts before screwing them into the aluminum formwork fastening bolts. Step 5: Hoisting the steel formwork The steel formwork was hoisted into place using a tower crane in conjunction with manual labor. Step Six: Reinforcement of Steel Formwork After hoisting the steel formwork at the expansion joint into place, first screw the fastening bolts into the steel formwork nuts, and tighten the fastening bolts from the aluminum film side; then seal the column head formwork, first insert the pins according to the screw hole positions, insert the wedges from top to bottom, and then use through-wall bolts to connect the head formwork with the steel formwork and aluminum formwork, and install diagonal braces on the inside to fix the shear wall aluminum formwork; Step 7, Template Verification At the top corner of the wall formwork, a fixed plumb bob is dropped freely, with the tip of the plumb bob aligned with the verticality control line of the floor. If there is any deviation, it is adjusted by adjusting the diagonal brace until the tip of the plumb bob coincides with the reference control line. After the verticality and expansion joint dimensions are checked and meet the requirements of the drawings and specifications, the next process is carried out. After the steel formwork is removed, it will be lifted and hoisted to the upper floor by a tower crane for construction. An adjustment seat is also provided on the ground. The adjustment seat is provided with a positioning groove. The positioning groove has an inclined surface that gradually slopes towards the aluminum template side from the outside to the inside. A positioning block is provided on the side of the steel template. The positioning block is provided with a guide platform that matches the inclined surface. The positioning block is adapted to sit in the positioning groove and can slide down and inward along the inclined surface of the positioning groove so that the steel template is close to the aluminum template. The lower part of the adjusting seat is provided with a telescopic rod and a fixed seat. The fixed seat is fixed to the ground, and the telescopic rod is a telescopic adjustment structure that adjusts the vertical height of the adjusting seat. The positioning groove is an isosceles trapezoidal structure; Positioning grooves are provided on both sides of the adjustment seat.

2. The method for constructing narrow expansion joints using a combination of suspended steel formwork and aluminum formwork on the same floor, as described in claim 1, is characterized in that: The steel formwork is a spliced ​​structure, with adjacent steel formwork panels assembled through splice seams and fixed together by welding.

3. The method for constructing narrow expansion joints using a combination of suspended steel formwork and aluminum formwork on the same floor, as described in claim 1, is characterized in that: The pad is a block-shaped structure, the positioning post is a nut, the nut is fixedly welded to the pad, the pad is welded to the steel template, and the screw hole corresponds to the threaded hole and the positioning hole.

4. The method for constructing narrow expansion joints using a combination of suspended steel formwork and aluminum formwork on the same floor, as described in claim 1, is characterized in that: There is a clearance zone on the steel formwork, and the steel formwork on both sides of the clearance zone is connected by a reinforcing rod.

5. The method for constructing narrow expansion joints using a combination of suspended steel formwork and aluminum formwork on the same floor, as described in claim 1, is characterized in that: The back ribs are steel reinforcement structures, which are arranged laterally on both sides of the positioning column and extend outwards towards the steel formwork.

6. The method for constructing narrow expansion joints using a combination of suspended steel formwork and aluminum formwork on the same floor, as described in claim 5, is characterized in that: A limiting zone is formed between the two steel reinforcement structures, and a corresponding back rib is set on the side of the aluminum formwork. The two back ribs are fastened together by tensioning bolts and U-shaped clamps.

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