Device and method for fixing thermal insulation board by using template tie rod to install combined limit piece

Abstract

The present application discloses a device and a method for installing a combined limit member using a template tie rod to fix a thermal insulation board, so as to solve the problems existing in the prior art that the complete set of combined components used in the integration of building thermal insulation structures are complex in form and high in cost, and the thermal insulation layer is prone to cracking and falling off, and the limit member generates a thermal bridge to increase the energy consumption loss of the building. The present application includes: a combined limit member for fixing the thermal insulation board. The two sides of the thermal insulation board use a first fixing plate, a second fixing plate and a middle section pipe as limit fixing stress-bearing members. A second sleeve passes through the first fixing plate, the first sleeve and the second fixing plate, and a tie rod is sleeved inside the second sleeve. After assembly and fixation, a firm whole is formed. The structure of the present application is simple, can be quickly assembled, has high overall strength and good quality, and the thermal insulation layer is not prone to cracking and falling off; the overall construction cost is low and it is easy to promote; the thermal insulation board is firmly fixed, does not deform, does not displace, and has impact resistance, ensuring the uniformity and integrity of the cast concrete structural wall and the outer protective layer.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and particularly relates to a device for fixing a thermal insulation board by using a formwork tie rod to install a combined limit piece and a construction method thereof. Background Art

[0002] Integrated building thermal insulation structure is a structural technology in which the thermal insulation material layer and the building structure are constructed synchronously. It is a rigid connection between the main building enclosure structure through a reinforced concrete wall (shear wall or structural wall), the thermal insulation material layer, and the concrete outer protective layer (including the decorative layer), so that the thermal insulation material layer is firmly poured between the two sides of the concrete to form an integral structural wall.

[0003] In the existing integrated building thermal insulation structure, the tie rod and the fixing plate are fixed separately on the thermal insulation board through limit pieces or plastic fixing pieces (fixing rods). For example, a plurality of drill holes are formed in the thermal insulation board, and limit pieces are respectively fitted in the plurality of drill holes to fix the tie rod and the fixing plate, and they are processed and combined into a complete set of thermal insulation material layer combination in the factory. This set of combination is composed of a fixing plate, a connecting piece, and a supporting formwork plastic fixing piece. The existing combination of this kind has a complex form, high cost, and the supporting plastic fixing piece will expose the concrete protective layer. The plastic fixing piece is not compatible with the concrete, and the weather resistance of the plastic fixing piece is poor. Once it corrodes and falls off, it will cause cracks in the external wall concrete protective layer, easily cause the external wall protective layer to enter water, damage the overall external wall protective layer, thermal insulation material layer, and main structure layer, greatly shortening the service life of the building and easily forming a thermal bridge to increase the energy consumption loss of the building.

[0004] In addition, there will be more damages and deformations during the transportation of this complete set of combination after leaving the factory. There are many problems in on-site assembly, connection, and fixing, etc., and adhesive cannot be injected after connection at the right-angle interface. The supporting formwork plastic fixing piece in this complete set of combination is brittle in material and cannot be fixed to the formwork. There will be more extrusion deformations, displacements, and installation fractures when fixing the formwork. At the same time, it is difficult to withstand the impact of concrete during the concrete pouring process, which will cause the overall thermal insulation material layer to shift and deform, and it is difficult to ensure the uniform thickness of the concrete structure layer and the outer protective layer.

[0005] After the fixing rod is deformed, it will easily cause slurry leakage at the perforation part, cause a thermal bridge in the thermal insulation material layer, increase the energy consumption loss, and greatly reduce the thermal insulation effect and other problems.

[0006] The above situations show that the existing set of combination is difficult to play the role of a proper fixing piece and cannot well meet the construction technical requirements of the integrated thermal insulation structure. Summary of the Invention

[0007] To this end, the present application provides a device and method for installing a combined limit member using a formwork tie rod to fix a thermal insulation board, so as to solve the problems existing in the prior art that the complete set of components used in the integration of building thermal insulation structures are complex in form and high in cost, and the thermal insulation layer is prone to cracking and falling off, and the limit member generates a thermal bridge, increasing the energy consumption loss of the building.

[0008] In order to achieve the above object, the present application provides the following technical solutions:

[0009] In a first aspect, a device for installing a combined limit member using a formwork tie rod to fix a thermal insulation board includes: a combined limit member, which is used to fix the thermal insulation board, and the combined limit member includes a first sleeve, a second sleeve, a first fixing plate and a second fixing plate, and the first fixing plate and the second fixing plate have the same structure;

[0010] The thermal insulation board is located between the concrete protective layer and the concrete wall, and a first temporary formwork and a second temporary formwork are respectively arranged on the outer sides of the concrete protective layer and the concrete wall; the first fixing plate and the second fixing plate are symmetrically arranged on both sides of the thermal insulation board, and the first fixing plate and the second fixing plate are made of high-strength nylon material; the thermal insulation board is provided with a drilled hole in the transverse direction.

[0011] The first sleeve is divided into a middle section pipe and outer section pipes located on both sides of the middle section pipe. The middle section pipe penetrates through the drilled hole, and both ends of the middle section pipe are respectively connected to the central holes of the first fixing plate and the second fixing plate; one ends of the two outer section pipes are respectively connected to the first fixing plate and the second fixing plate, and the other ends are respectively flush with the first temporary formwork and the second temporary formwork; the second sleeve sequentially passes through the first temporary formwork, one outer section pipe, the first fixing plate, the middle section pipe, the second fixing plate, the other outer section pipe, and the second temporary formwork, and a rigid tie rod is sleeved inside the second sleeve, and both ends of the tie rod are fixed by fixing members.

[0012] Optionally, the first fixing plate includes a plate body, a central hole is opened in the center of the plate body, an interface corresponding to the central hole is arranged along the outer side of the plate body, and openings are arranged at intervals along the circumferential direction of the plate body; a plurality of protrusions are symmetrically arranged on the plate body for fixing the wire mesh inside the concrete protective layer.

[0013] Optionally, a first stiffening rib is arranged between two adjacent openings; a second stiffening rib is arranged on the outer wall of the interface.

[0014] Optionally, the first stiffening rib is provided with an inclined slope from the center of the plate body to the outside.

[0015] Optionally, the number of the first stiffening ribs is 8.

[0016] Optionally, the slope is 2°.

[0017] Optionally, the outer diameter of the disc body is 60 mm; the thickness of the interface is 2 mm, the outer diameter of the inner diameter is 10.5 mm, and the inner diameter is 8.5 mm.

[0018] Optionally, the materials of the first fixing disc and the second fixing disc are both high-strength nylon materials.

[0019] Optionally, the pipe diameter of the first sleeve is 25 mm, and the pipe diameter of the second sleeve is 16 mm.

[0020] In a second aspect, a method for fixing a thermal insulation board by using a template tie rod to install a combined limiting member, using the device for fixing a thermal insulation board by using a template tie rod as described above, includes the following steps:

[0021] Step 1: First, drill holes in the thermal insulation board, and cut the first sleeve into a middle section pipe and two outer section pipes, a total of three sections;

[0022] Step 2: Insert the middle section pipe into the drilled hole, and arrange the first fixing disc and the second fixing disc on both sides of the thermal insulation board, and then connect the first fixing disc and the second fixing disc to both ends of the middle section pipe;

[0023] Step 3: Fix the interfaces of the first fixing disc and the second fixing disc to the two outer section pipes respectively, and make the other ends of the two outer end pipes flush with the inner ends of the first temporary template and the second temporary template respectively;

[0024] Step 4: Pass the second sleeve through one outer section pipe, the first fixing disc, the middle section pipe, the second fixing disc, and the other outer section pipe in sequence;

[0025] Step 5: Install the first temporary template and the second temporary template on both sides of the thermal insulation board, so that the first temporary template and the second temporary template are respectively located outside the two outer section pipes, and insert a tie rod into the second sleeve;

[0026] Step 6: Set fixing members at both ends of the tie rod respectively, and limit and fix the first temporary template and the second temporary template by tightening the fixing members;

[0027] Step 7: Then pour concrete between the thermal insulation board and the first temporary template and between the thermal insulation board and the second temporary template respectively;

[0028] Step 8: When the concrete strength reaches a certain value, remove the formwork.

[0029] Compared with the prior art, the present application has at least the following beneficial effects:

[0030] 1. The present application provides a device and method for fixing a thermal insulation board by using a template tie rod to install a combined limiting member, including a combined limiting member for fixing the thermal insulation board. The thermal insulation board is provided with drilled holes along the transverse direction, and the first sleeve is divided into three sections to meet the requirements of fixed limitation; on both sides of the thermal insulation board, a first fixing disc, a second fixing disc made of high-strength nylon material and a middle section pipe are used as limiting and fixing stress-bearing members. The interfaces on both sides of the first fixing disc and the second fixing disc are tightly connected and fixed to the middle section pipe and the outer section pipe made of PVC material respectively, and the two ends of the outer section pipe are flush with the first temporary template and the second temporary template respectively to withstand the stress; the second sleeve penetrates through the first temporary template, the first fixing disc, the first sleeve, the second fixing disc, and the second temporary template, and a tie rod is sleeved inside the second sleeve. The two ends of the tie rod are fixed by fixing members, and then a firm whole is formed after assembly and fixation, ensuring no displacement and no deformation during the concrete pouring process, and ensuring the quality of the entire concrete wall; the structure of the present application is simple, can be quickly assembled, each whole has high strength and good quality, and the thermal insulation layer is not easy to crack or fall off; during the construction and installation combination process, it is easy for workers to understand and operate simply, the overall construction cost is low, and it is easy to promote. The overall cost is reduced by about 60% compared with the existing complete set of components; only two special high-strength nylon limiting and fixing discs are added, making full use of the template fixing tie rod and PVC sleeve during the conventional concrete pouring process, ensuring that the thermal insulation board is fixed firmly, without deformation, displacement, and can resist impact force, lateral pressure, and vibration force, ensuring the uniformity and integrity of the cast concrete structural wall and the outer protective layer. Moreover, the second sleeve can be removed together with the tie rod when the formwork is removed for repeated use; through the fixing members on the outer sides of the first temporary template and the second temporary template and the combined limiting members (the first fixing disc, the second fixing disc, the first sleeve, the second sleeve, and the tie rod) on the inner sides, the two-way fixation of the thermal insulation board is realized, saving time and effort and reducing the occurrence of thermal bridges; the present application solves the problem of incompatibility between the plastic ejector rod and the concrete, ensures the quality problem of no cracks and no water leakage in the concrete protective layer, has good weather resistance, realizes the quality guarantee of the whole life cycle of the building, avoids the appearance of thermal bridges, eliminates the phenomenon of condensation and mildew, reduces energy consumption loss, prevents the weathering of the concrete enclosure structure, and ensures the service life of the building.

[0031] 2. The materials of the first fixing disc and the second fixing disc in the present application are both high-strength nylon materials, which have the advantages of good elasticity, good tensile performance, and high bending resistance.

[0032] 3. The first stiffening ribs and the second stiffening ribs are respectively arranged on the disc end face and the interface of the first fixing disc in the present application. Both the first stiffening ribs and the second stiffening ribs gradually become thinner from the center to the outside, forming a certain slope, so that the strength at the center of the fixing disc is higher, improving the impact resistance of the thermal insulation board during concrete pouring;

[0033] 4. In the present application, by reforming and optimizing the structural shape and size of the fixing disc, the impact resistance and the overall tensile performance reach the best under the condition of the least material consumption of the fixing disc. Brief Description of the Drawings

[0034] To more intuitively illustrate the prior art and the present application, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application; for example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / deletion / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. based on the technical concept disclosed in the present application and the exemplary drawings.

[0035] Figure 1 Structural schematic provided for an embodiment of the present application Figure 1 ;

[0036] Figure 2 Structural schematic provided for an embodiment of the present application Figure 2 ;

[0037] Figure 3 For Figure 1 structural schematic of the heat preservation board in

[0038] Figure 4 For Figure 1 schematic diagram of the first sleeve and the second sleeve being sleeved in

[0039] Figure 5 For Figure 1 structural schematic of the first fixing plate in Figure 1 ;

[0040] Figure 6 For Figure 1 structural schematic of the first fixing plate in Figure 2 ;

[0041] Figure 7 For Figure 5 front view shown

[0042] Explanation of Reference Numerals:

[0043] 1, heat preservation board; 101, drilled hole; 2, first temporary formwork; 3, second temporary formwork; 4, first sleeve; 401, middle section pipe; 402, outer section pipe; 5, second sleeve; 6, first fixing plate; 601, plate body; 6011, inner ring; 6012, outer ring; 602, interface; 603, opening; 604, first stiffening rib; 605, second stiffening rib; 606, protrusion; 607, central hole; 7, second fixing plate; 8, pull rod; 9, fixing member. Detailed Description of the Embodiments

[0044] The following further details the present application through specific embodiments in conjunction with the drawings.

[0045] In the description of the present application: Unless otherwise specified, the meaning of "a plurality of" is two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special significance in terms of technical connotations (for example, it should not be understood as emphasizing importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0046] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in the present application are usually for the convenience of visually understanding with reference to the drawings, and are not absolute limitations on the positional relationships in the actual product. Without departing from the technical concept disclosed in the present application, changes in these relative positional relationships should also be regarded as within the scope of the expression of the present application.

[0047] An embodiment of the present application, such as Figures 1-4 shown, a device for fixing a thermal insulation board by using a template tie rod to install a combined limit member, comprising: a combined limit member for fixing the thermal insulation board 1, which includes a first sleeve 4, a second sleeve 5, a first fixing plate 6 and a second fixing plate 7, and the first sleeve 4 and the second sleeve 5 are made of PVC material;

[0048] The thermal insulation board 1 is located between the concrete protective layer and the concrete wall, and a first temporary formwork 2 and a second temporary formwork 3 are respectively arranged on the outer sides of the concrete protective layer and the concrete wall; the first fixing plate 6 and the second fixing plate 7 are symmetrically arranged on both sides of the thermal insulation board 1, and the structures and sizes of the first fixing plate 6 and the second fixing plate 7 are the same; the materials of the first fixing plate 6 and the second fixing plate 7 are high-strength nylon materials, and the thermal insulation board 1 is provided with a drilled hole 101 in the transverse direction; a wire mesh is arranged on the inner side of the concrete protective layer;

[0049] The first sleeve 4 is divided into a middle section pipe 401 and outer section pipes 402 located on both sides of the middle section pipe 401. The middle section pipe 401 penetrates through the drilled hole 101, and the length of the middle section pipe 401 is the same as that of the drilled hole 101; both ends of the middle section pipe 401 are respectively connected to the central holes 607 of the first fixing plate 6 and the second fixing plate 7; one ends of the two outer section pipes 402 are respectively connected to the first fixing plate 6 and the second fixing plate 7, and the other ends are respectively flush with the first temporary formwork 2 and the second temporary formwork 3; the second sleeve 5 sequentially passes through the first temporary formwork 2, one outer section pipe 402, the first fixing plate 6, the middle section pipe 401, the second fixing plate 7, the other outer section pipe 402, and the second temporary formwork 3, and a rigid tie rod 8 is sleeved inside the second sleeve 5. The length of the tie rod 8 is greater than the distance between the first temporary formwork 2 and the second temporary formwork 3, and both ends of the tie rod 8 are fixed by fixing members 9.

[0050] In this embodiment, such as Figures 5-7As shown, there are 8 drill holes 101 on each square meter of the insulation board 1, and 8 first fixing plates 6 and 8 second fixing plates 7 are symmetrically arranged on both sides thereof;

[0051] Both the first fixing plate 6 and the second fixing plate 7 include a disc body 601. A central hole 607 is provided at the center of the disc body 601. An interface 602 is arranged along the outer side of the disc body 601 corresponding to the central hole 607. Openings 603 are arranged at intervals along the circumference of the disc body 601; The disc body 601 is divided into an inner ring 6011 and an outer ring 6012. First stiffening ribs 604 are arranged between two adjacent openings 603 on the disc body 601. The first stiffening ribs 604 gradually become thinner from the outer wall of the inner ring 6011 to the outer ring 6012 (i.e., thick in the middle and thin at the edge), forming a certain slope. The slope is 2°. The number of the first stiffening ribs 604 is 8, as Figure 5 、 Figure 6 shown; A second stiffening rib 605 is arranged on the outer wall of the interface 602. The second stiffening rib 605 also gradually becomes thinner from the center of the disc body 601 to the outside, forming a slope of 2°; A plurality of protrusions 606 are symmetrically arranged on the disc body 601. The total number of the protrusions 606 is 8. Four protrusions 606 on one side are sequentially located at the rear of the first stiffening ribs 604. The space between adjacent protrusions 606 can be used to fix the wire mesh.

[0052] Preferably, the materials of both the first fixing plate 6 and the second fixing plate 7 are high-strength nylon materials.

[0053] Preferably, the diameter of the first sleeve 4 is 25 mm, and the diameter of the second sleeve 5 is 16 mm; The diameter of the inner ring 6011 is 22.5 mm, and the diameter (outer diameter) of the outer ring 6012 is 60 mm; The thickness of the interface 602 is 2 mm, the outer diameter of the inner diameter (i.e., the central hole of the disc body 601) is 10.5 mm, and the inner diameter is 8.5 mm.

[0054] The materials of both the first fixing plate 6 and the second fixing plate 7 are high-strength nylon materials, which have the advantages of good elasticity, good tensile performance and high bending resistance; The slopes provided on the first stiffening ribs 604 and the second stiffening ribs 605 make the center of the disc body 601 thicker, improving the impact resistance of the insulation board 1 during concrete pouring; The structure and shape design of the first fixing plate 6 and the second fixing plate 7, and the number and slope of the first stiffening ribs 604 are all obtained through actual verification. At this value, the first fixing plate 6 and the second fixing plate 7 use the least amount of materials, have greater impact resistance and higher overall tensile performance.

[0055] Preferably, the tie rod 8 is a screw rod, and the tie rod 8 is threadedly connected with the fixing member 9.

[0056] A method for fixing an insulation board by using a template tie rod to install a combined limiting member. Using the device for fixing an insulation board by using a template tie rod to install a combined limiting member as described above, the specific construction steps include the following:

[0057] Step 1: Prepare for the preliminary work; first, drill holes 101 for the middle section pipe 401 to penetrate along the transverse direction on the insulation board 1, and cut the first sleeve 4 into three sections, namely the middle section pipe 401 and two outer section pipes 402 on both sides of the middle section pipe 401;

[0058] Step 2: Insert the middle section pipe 401 into the drill hole 101, symmetrically arrange the first fixing plate 6 and the second fixing plate 7 on both sides of the insulation board 1, and the interfaces 602 of the first fixing plate 6 and the second fixing plate 7 face outward. Then connect the first fixing plate 6 and the second fixing plate 7 on both sides of the insulation board 1 to both ends of the middle section pipe 401;

[0059] Step 3: Fix the interfaces 602 of the first fixing plate 6 and the second fixing plate 7 to the two outer section pipes 402 respectively, and make the other ends of the two outer end pipes flush with the inner ends of the first temporary template 2 and the second temporary template 3 to withstand the force;

[0060] Step 4: Pass the second sleeve 5 through one outer section pipe 402, the first fixing plate 6, the middle section pipe 401, the second fixing plate 7, and the other outer section pipe 402 in sequence;

[0061] Step 5: Set the first temporary template 2 and the second temporary template 3 on both sides of the insulation board 1 respectively, so that the first temporary template 2 and the second temporary template 3 are located outside the two outer section pipes 402 respectively; and insert a rigid pull rod 8 into the second sleeve 5;

[0062] Step 6: Set fixing parts 9 at both ends of the pull rod 8 respectively, and limit and fix the first temporary template 2 and the second temporary template 3 by tightening the fixing parts 9;

[0063] Step 7: Then pour concrete between the insulation board 1 and the first temporary template 2, and between the insulation board 1 and the second temporary template 3 respectively;

[0064] Step 8: When the concrete strength reaches a certain value, remove the fixing parts 9, pull out the second sleeve 5, and at the same time remove the first temporary template 2 and the second temporary template 3.

[0065] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered as within the scope described in this specification.

[0066] In the foregoing, the present application has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present application, several conventional adjustments or further innovations can also be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained from these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. Device for fixing thermal insulation board by using template tie rod to install combined limit piece, characterized in that, Comprising: A combined limiting member for fixing a thermal insulation board, the combined limiting member including a first sleeve, a second sleeve, a first fixing plate and a second fixing plate, and the first fixing plate and the second fixing plate having the same structure; The thermal insulation board is located between a concrete protective layer and a concrete wall, and a first temporary formwork and a second temporary formwork are respectively arranged on the outer sides of the concrete protective layer and the concrete wall; the first fixing plate and the second fixing plate are symmetrically arranged on both sides of the thermal insulation board, and the first fixing plate and the second fixing plate are made of high-strength nylon material; the thermal insulation board is provided with drilled holes in the transverse direction; The first sleeve is divided into a middle section pipe and outer section pipes located on both sides of the middle section pipe. The middle section pipe penetrates through the drilled holes, and both ends of the middle section pipe are respectively connected to the central holes of the first fixing plate and the second fixing plate; one ends of the two outer section pipes are respectively connected to the first fixing plate and the second fixing plate, and the other ends are respectively flush with the first temporary formwork and the second temporary formwork; the second sleeve sequentially passes through the first temporary formwork, one outer section pipe, the first fixing plate, the middle section pipe, the second fixing plate, the other outer section pipe, and the second temporary formwork, and a rigid pull rod is sleeved inside the second sleeve, and both ends of the pull rod are fixed by fixing members; The first fixing plate includes a plate body, a central hole is opened in the center of the plate body, an interface corresponding to the central hole is arranged along the outer side of the plate body, and openings are arranged at intervals along the circumferential direction of the plate body; a plurality of protrusions are symmetrically arranged on the plate body for fixing a wire mesh on the inner side of the concrete protective layer; a first stiffening rib is arranged between two adjacent openings; a second stiffening rib is arranged on the outer wall of the interface; the first stiffening rib is provided with an inclined slope from the center of the plate body to the outside; the diameter of the first sleeve is 25 mm, and the diameter of the second sleeve is 16 mm.

2. The device for fixing the thermal insulation board by using the template tie rod to install the combined limit piece according to claim 1, wherein, The number of the first stiffening ribs is 8.

3. The device for fixing the thermal insulation board by using the template tie rod to install the combined limit piece according to claim 1, characterized in that, The slope is 2°.

4. The device for fixing the thermal insulation board by using the template tie rod to install the combined limit piece according to claim 2, characterized in that, The outer diameter of the plate body is 60 mm; the thickness of the interface is 2 mm, the outer diameter of the inner diameter is 10.5 mm, and the inner diameter is 8.5 mm.

5. A method for installing and fixing a thermal insulation board with a combined limit member by using a template tie rod, characterized in that, Using the device for installing a combined limiting member to fix a thermal insulation board by a formwork pull rod according to any one of claims 1-4, comprising the following steps: Step 1: First, drill holes in the thermal insulation board, and cut the first sleeve into a middle section pipe and two outer section pipes, a total of three sections; Step 2: Insert the middle section pipe into the drilled holes, and arrange the first fixing plate and the second fixing plate on both sides of the thermal insulation board, and then connect the first fixing plate and the second fixing plate to both ends of the middle section pipe; Step 3: Fix the interfaces of the first fixing plate and the second fixing plate to the two outer section pipes respectively, and make the other ends of the two outer end pipes flush with the inner ends of the first temporary formwork and the second temporary formwork respectively; Step 4: Insert the second sleeve sequentially through one outer section pipe, the first fixing plate, the middle section pipe, the second fixing plate, and the other outer section pipe; Step 5: Install the first temporary formwork and the second temporary formwork on both sides of the thermal insulation board, so that the first temporary formwork and the second temporary formwork are respectively located outside the two outer section pipes, and insert a pull rod into the second sleeve; Step 6: Fixing parts are respectively arranged at both ends of the pull rod, and by tightening the fixing parts, the first temporary formwork and the second temporary formwork are limited and fixed; Step 7: Then, concrete is respectively poured between the insulation board and the first temporary formwork, and between the insulation board and the second temporary formwork; Step 8: After the concrete strength reaches a certain value, formwork removal is carried out.

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