A shaped cable curtain wall for low-rigidity buildings and its construction method

Abstract

The present invention relates to the field of curtain wall technology, disclosing a shaped cable-stayed curtain wall for low-rigidity buildings and its construction method. The curtain wall comprises a plurality of face cables extending downward from the roof, decorative elements anchored to the face cables, a cantilevered cable-hanging platform located at the edge of the roof and above the curtain wall, and a bottom cable located at the base of the face cables. The face cables are connected below the cantilevered cable-hanging platform at their upper ends and to the bottom cable at their lower ends. The bottom cable is a passive, arched cable with only its ends fixed. In this invention, the prestressed cables (also known as face cables) in the cable curtain wall are fixed to the soft bottom cable instead of the foundation. This significantly reduces building deformation during tensioning of the face cables. Furthermore, the deformation of the bottom cable follows the tensioning of the face cables, unlike the hysteresis experienced by the building. This overcomes the problem of deformation of the cable curtain wall caused by building deformation during construction. Furthermore, subsequent wind deformation of the building prevents the face cables in the cable curtain wall from repeatedly expanding and contracting.

Description

Technical Field

[0001] The present invention relates to the technical field of curtain walls, in particular to a shaped cable curtain wall for low-rigidity buildings and a construction method thereof. Background Art

[0002] Cable-stayed curtain walls are a new type of curtain wall, different from framed or unitized curtain walls. Instead of relying on rigid supports to suspend the curtain wall components, they rely on prestressed cables (often referred to as surface cables during construction, meaning they are attached to the wall surface). These cables are distributed parallel to each other within the curtain wall, and sometimes additional cables are installed to connect them into a cable network, or wall ties are used to further secure the cables.

[0003] Cable curtain walls consist of prestressed cables fixed at one end to the building roof and the other to the foundation. Therefore, they impose certain requirements on the building in which they are installed. If the building in which the cable curtain wall is installed has low rigidity (such as a long-span truss / grid structure or cable-membrane structure), this can negatively impact the construction of the cable curtain wall. Specifically, the cable curtain wall can easily deform during and after construction, and the cables lose their prestress very quickly.

[0004] The inventors have discovered through research that the following reasons lead to the easy deformation of cable curtain walls during and after construction when constructing cable curtain walls on low-rigidity buildings:

[0005] When the prestressed cables in a cable-stayed curtain wall are stretched, they cause the building to deform. The direction and magnitude of this deformation are difficult to control, and the time it takes to complete the deformation is significantly longer than with prestressed cables. This severely disrupts the design of the cable-stayed curtain wall. Not only is it difficult to achieve the desired shape during tensioning, but even if tension is achieved, it will eventually deform again due to the deformation caused by new loads on the roof.

[0006] The reasons why the prestressed cables lose their prestress quickly after construction when constructing cable curtain walls on low-rigidity buildings are as follows:

[0007] Low-rigidity buildings will deform when subjected to wind loads, causing the prestressed cables in the cable curtain wall to repeatedly expand and contract, causing the prestressed cables to yield quickly.

[0008] Based on this understanding, the inventors improved the existing cable curtain wall and applied it to the south entrance canopy of the Nanchang Poly Grand Theater. The building where the cable curtain wall is located is a large truss structure with a span of several hundred meters. The overall building rigidity is relatively low. However, after using the present invention, the curtain wall did not deform or lose prestress due to the low building rigidity. Summary of the Invention

[0009] The invention provides a shaped cable curtain wall for low-rigidity buildings and a construction method thereof.

[0010] The technical problem to be solved is that the cable curtain wall on a low-rigidity building is easily deformed during and after construction, and the prestressing of the cables is lost very quickly.

[0011] To solve the above technical problems, the present invention adopts the following technical solution: a shaped cable curtain wall for low-rigidity buildings, wherein the low-rigidity buildings include buildings with cable-membrane structures and large-span steel structures with truss roofs or grid roofs, wherein the side elevation of the building where the cable curtain wall is located is recorded as the curtain wall installation surface, the cable curtain wall includes a plurality of surface cables extending downward from the roof and decorative members anchored to the surface cables, the surface cables being prestressed cables, the cable curtain wall further including a cantilevered hanging cable platform provided at the edge of the roof and above the curtain wall installation surface, and a bottom cable provided at the bottom of the surface cables, wherein the upper ends of the surface cables are connected below the cantilevered hanging cable platform and the lower ends are connected to the bottom cables;

[0012] The bottom cable is a passive cable in an arched shape, and the end of the bottom cable is anchored on the foundation or rigidly connected to a column on the foundation.

[0013] Furthermore, a main entrance of the building is provided on the surface on which the curtain wall is set, and the cable curtain wall extends obliquely downward from the roof to form a canopy covering the main entrance; the cable curtain wall is divided into two parts, the part covering the main entrance is recorded as the door curtain, and the other part is recorded as the wall curtain. A bottom cable is provided under each of the door curtain and the wall curtain, and the two bottom cables are connected end to end. Both ends of the bottom cable of the wall curtain are anchored to the foundation, and the end of the bottom cable of the door curtain close to the other bottom cable is anchored to the foundation, and the end away from the other bottom cable is anchored to the column.

[0014] Furthermore, the side surface of the wall covering curtain is connected to the curtain wall setting surface through the wall connecting rod, and the side surface of the door covering curtain is not connected to the curtain wall setting surface.

[0015] Furthermore, the cantilevered rope hanging platform includes a cantilevered steel beam cantilevered horizontally outward from the edge of the roof. The cantilevered steel beams are arranged at intervals along the edge of the roof and correspond one-to-one with the surface cables. The upper ends of the surface cables are hung on the cantilevered ends of the cantilevered steel beams. The cantilevered steel beams are also covered with platform plates to form a working platform for construction workers to work at high altitude above.

[0016] Furthermore, the upper end of the face cable is hingedly connected to the cantilevered rope platform and the lower end is hingedly connected to the bottom cable. The plane where the face cable and its projection on the ground are located is recorded as the cable pitch plane, and the hinge axis at the end of the face cable is arranged perpendicular to the cable pitch plane; the lower end of the face cable is connected to the bottom cable through a sliding ear plate slidingly arranged on the bottom cable, the sliding ear plate is clamped on the bottom cable and locked to slide by a bolt, and the lower end of the face cable is connected to the sliding ear plate through a pin shaft.

[0017] Furthermore, the decorative piece is a horizontally arranged ceramic stick, and the ceramic stick and the surface rope form a grille curtain wall.

[0018] A construction method for a shaped cable curtain wall for a low-rigidity building is used to construct the above-mentioned shaped cable curtain wall for a low-rigidity building, and comprises the following steps:

[0019] Step 1: Set coordinate control points at intervals along the length of the bottom cable;

[0020] Step 2: Create a 3D model of the building and cable curtain wall, and then simulate the tensioning process of the cables. The simulation ends when the shape and posture of the entire cable curtain wall meet the design requirements. The coordinates of each control point, the tensioning length of each cable, and the cable force are recorded at the final tensioning state.

[0021] Step 3: After the roof construction is completed, the roof dead load is applied, and the cantilever hanging rope platform is installed and the deformation is stable, install the bottom cable and the surface cable;

[0022] Step 4: Prestress each cable to ensure that the tension length of each cable matches the value recorded in step 2, and the deviation between the cable force and the value recorded in step 2 is within a safe range; the cable tensioning is carried out in stages, with each stage tensioning at least one day apart;

[0023] Step 5: Measure the line shape of the bottom cable. If the line shape is consistent with the design value, the tensioning is completed. If the line shape deviates from the design value, compare the deviation between the actual coordinates of each coordinate control point and the coordinates recorded in step 2. Find the coordinate control point whose coordinate deviation exceeds the design allowable range and record it as the deviation point. Adjust the tensioning length of the surface cable near the deviation point by tensioning or releasing the tension to make the coordinates of the deviation point consistent with the coordinates recorded in step 2.

[0024] Step 6: Install decorative parts and wall connecting rods.

[0025] Furthermore, in step 2, when installing, the lower end of each face rope is first connected to the bottom rope, and then the face rope is pulled upward and the upper end of the face rope is connected to the cantilevered hanging rope platform.

[0026] Furthermore, when installing and tensioning the face cables, they are divided into multiple operation groups according to the following rules: the face cables in the same operation group are evenly distributed above the same base cable; in each operation group, there is a fixed number of face cables between two adjacent face cables; the same face cable is only assigned to one operation group; and each operation group contains at least 5 face cables;

[0027] When installing the bottom cable, if both ends of the bottom cable need to be anchored on the foundation, first unfold the bottom cable at the projection position of the bottom cable to the ground and anchor both ends of the bottom cable to the foundation, then install a face cable of the operation group on the bottom cable to make the bottom cable arch, and finally install the remaining face cables on the bottom cable;

[0028] When installing the bottom cable, if one end of the bottom cable needs to be anchored on the foundation and the other end needs to be anchored on the column, first unfold the bottom cable at the projection position of the bottom cable to the ground and anchor one end of the bottom cable to the foundation, then install a face cable of an operating group on the bottom cable to make the bottom cable arch, then anchor the other end of the bottom cable to the column, and finally install the remaining face cables on the bottom cable.

[0029] Furthermore, in step 4, during each level of tensioning, first take a surface cable of an operating group on a bottom cable for tensioning, then take a surface cable of an operating group on another bottom cable for tensioning, and repeat the cycle until all surface cables have completed the same level of tensioning.

[0030] Compared with the prior art, the cable-stayed curtain wall for low-rigidity buildings and the construction method thereof of the present invention have the following beneficial effects:

[0031] In the present invention, the prestressed cables (i.e., surface cables) in the cable curtain wall are no longer fixed to the foundation, but are fixed to a soft bottom cable (which has significantly lower stiffness than the building and is more easily deformed than the building when tensioned). This greatly reduces the deformation of the building when the surface cables are tensioned. At the same time, the deformation of the bottom cable does not lag behind that of the building, but is consistent with the tensioning process of the surface cables, thereby overcoming the problem of deformation of the cable curtain wall caused by the tensioning deformation of the building during construction.

[0032] In the present invention, by constructing the cable curtain wall after the dead load on the roof is completed, it is ensured that the building will not be deformed due to the subsequent new load; and the interval between each level of prestressed cable tensioning is greatly lengthened (when performing conventional graded tensioning, the interval between two levels is usually half an hour or even a few minutes, but in the present invention, it is extended to more than a day), ensuring that the deformation of the building occurs during the tensioning process rather than after the tensioning is completed (so that the deformation of the building can be solved during the tensioning adjustment, and due to the existence of the bottom cable, the deformation of the building is small and can be easily solved during the tensioning adjustment), thereby overcoming the problem of deformation of the cable curtain wall caused by building deformation after construction.

[0033] In the present invention, when the building is subsequently deformed by wind, the surface cables in the cable curtain wall are no longer driven to repeatedly expand and contract, but the bottom cables are driven to bend up and down, thereby preventing the prestressed cables from yielding due to repeated expansion and contraction.

[0034] In the present invention, the bottom cable serves as a soft boundary with a large deformation amplitude. If its line shape and position meet the design requirements, it can ensure that the shape of the entire curtain wall meets the requirements. At the same time, since the bottom cable is arched and positioned relatively low, it is very easy to monitor the line shape and position, thereby greatly reducing the difficulty of controlling the curtain wall shape.

[0035] In the present invention, a cantilevered rope hanging platform is provided at the upper end of the face cable, and the lower end of the face cable is installed first and then the upper end, so that the face cable does not need to cross the building during installation. This not only facilitates the installation of the upper end of the face cable (there is a distance between the upper end of the face cable and the building, so there is no need to consider the collision of the face cable and the building when hoisting it), but also avoids damage to the face cable due to electrochemical corrosion when crossing the building (electrochemical corrosion is very likely to occur when metals of different materials come into contact). BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of a cable curtain wall for low-rigidity buildings according to the present invention. In the figure, the decorative parts are removed to prevent them from obstructing the cables.

[0037] Figure 2 This is a schematic diagram of the installation method of the face cable;

[0038] Figure 3 The figure is a schematic diagram of the installation method of the bottom cable, and the installation position of the bottom cable is marked with a dotted line in the figure;

[0039] Figure 4 Schematic diagram of the structure of the sliding ear plate;

[0040] In the figure, 1-cantilevered rope hanging platform, 2-bottom rope, 3-surface rope, 4-wall connecting rod. DETAILED DESCRIPTION

[0041] like Figure 1 As shown, a shaped cable curtain wall for low-rigidity buildings includes buildings with cable-membrane structures and large-span steel structures with truss roofs or grid roofs. The side elevation of the building where the cable curtain wall is located is recorded as the curtain wall installation surface. The cable curtain wall includes a plurality of surface cables 3 extending downward from the roof and decorative parts anchored to the surface cables 3. The surface cables 3 are prestressed cables. The cable curtain wall also includes a cantilevered hanging cable platform 1 arranged at the edge of the roof and above the curtain wall installation surface, and a bottom cable 2 arranged at the bottom of the surface cables 3. The upper ends of the surface cables 3 are connected below the cantilevered hanging cable platform 1 and the lower ends are connected to the bottom cable 2.

[0042] Here, the cantilevered hanging rope platform 1 allows a distance between the face cable 3 and the building. Combined with the installation method of first down and then up, it prevents the face cable 3 from hitting the building and breaking the glass on the building during installation, and also avoids the face cable 3 and the building from crossing and causing electrochemical corrosion.

[0043] Bottom cable 2 is a passive cable with an arched shape. Its ends are anchored to the foundation or to columns rigidly connected to the foundation. Bottom cable 2 is more easily deformed than the building and is referred to as a soft boundary in force analysis. Like a bungee cord, bottom cable 2 deforms more easily than the building under load, thus preventing significant deformation. Columns rigidly connected to the foundation, with rigidly attached bases, are immune to swaying due to horizontal loads. In this embodiment, the columns rigidly connected to the foundation are simply repurposed from columns in the corner of the building.

[0044] The main entrance of the building is opened on the curtain wall setting surface, and the cable curtain wall extends obliquely downward from the roof to form a canopy covering the main entrance; the cable curtain wall is divided into two parts, the part covering the main entrance is recorded as the door curtain, and the other part is recorded as the wall curtain. A bottom cable 2 is set under each of the door curtain and the wall curtain, and the two bottom cables 2 are connected end to end. Both ends of the bottom cable 2 of the wall curtain are anchored to the foundation, and the end of the bottom cable 2 of the door curtain close to the other bottom cable 2 is anchored to the foundation, and the end away from the other bottom cable 2 is anchored to the column.

[0045] This not only makes the shape more beautiful, but also acts as a canopy without blocking the main entrance, making it difficult for people entering the building to find the main entrance.

[0046] The side surfaces of the face cables 3 of the wall curtain are connected to the curtain wall setting surface through the wall connecting rods 4. This part has a large area and is located outside the sight of people entering the building, so it is suitable for installing the wall connecting rods 4. The side surfaces of the face cables 3 of the door curtain are not connected to the curtain wall setting surface. This part has a small area and is located within the sight of people entering the building, so it is not suitable for installing the wall connecting rods 4.

[0047] The cantilevered rope hanging platform 1 includes a cantilevered steel beam cantilevered horizontally outward from the edge of the roof. The cantilevered steel beams are arranged at intervals along the edge of the roof and correspond one-to-one with the surface cables 3. The upper ends of the surface cables 3 are hung on the cantilevered ends of the cantilevered steel beams; the cantilevered steel beams are also covered with platform plates to form a working platform for construction workers to work at high altitude above.

[0048] The cantilevered steel beam in the cantilevered rope platform 1 here also plays a buffering role similar to the bottom cable 2 to a certain extent, avoiding direct rigid connection between the building and the surface cable 3. At the same time, it is best to leave some construction holes on the platform plate to facilitate the installation of hand hoists, slings, or to allow construction workers to reach down directly.

[0049] The upper end of the face cable 3 is hingedly connected to the cantilevered rope platform 1 and the lower end is hingedly connected to the bottom cable 2. The plane where the face cable 3 and its projection on the ground are located is recorded as the cable pitch plane, and the hinge axis at the end of the face cable 3 is set perpendicular to the cable pitch plane. The hinge connection here is because the face cable 3 itself has a certain hardness. If the end of the face is rigidly connected, the end may be damaged when the face cable 3 pitches.

[0050] like Figure 4 As shown, the lower ends of the face cables 3 are connected to the bottom cables 2 via sliding lugs that slide onto the bottom cables 2. The sliding lugs are clamped to the bottom cables 2 and locked and slidable by bolts. The lower ends of the face cables 3 are connected to the sliding lugs via pins. The sliding lugs not only facilitate precise adjustment of the position of the lower ends of the face cables 3, but also provide a method for adjusting the shape of the curtain wall in addition to adjusting the tension length of the face cables 3.

[0051] The decorative elements are horizontally arranged ceramic rods, which, together with the surface cables 3, form a grid curtain wall. Here, the ceramic rods and the surface cables 3 directly form a grid-like structure, eliminating the need for a cable net. If the decorative elements were curtain wall glass, horizontal cables would still be required on the surface cables 3 to form a cable net.

[0052] A construction method for a shaped cable curtain wall for a low-rigidity building is used to construct the above-mentioned shaped cable curtain wall for a low-rigidity building, and comprises the following steps:

[0053] Step 1: Set coordinate control points at intervals along the length direction on the bottom cable 2.

[0054] Step 2: Create a 3D model of the building and cable curtain wall, then simulate the tensioning process of the face cables 3. The simulation concludes with the shape and posture of the entire cable curtain wall meeting the design requirements. The coordinates of each control point, the tensioned length of each face cable 3, and the cable force at the final tension state are recorded. The tensioned length here refers to the distance the cable end is pulled toward the tensioning equipment.

[0055] Step 3: After the roof construction is completed, the roof dead load is applied, and the cantilever hanging rope platform 1 is installed and the deformation is stable, install the bottom cable 2 and the surface cable 3.

[0056] For the face cable 3 with an adjusting screw at the cable head, the adjusting screw can be used to loosen the face cable 3 before installation, and then pre-tightened after installation.

[0057] Step 4: Prestress each surface cable 3 so that the tensioned length of each surface cable 3 conforms to the value recorded in step 2, and the deviation between the cable force and the value recorded in step 2 is within a safe range; the surface cables 3 are tensioned in a graded manner, with each level of tensioning at least one day apart.

[0058] The cable tension has little impact on the curtain wall's shape; it's primarily used to determine safety. Excessive cable tension indicates that the face cable 3 may be stuck somewhere, while insufficient cable tension indicates that the cable clips on the face cable 3 may have slipped. The safety margin is specified by the designer, typically within a range of plus or minus 10%. In this embodiment, tensioning is performed in three stages, with the first stage providing the greatest amplitude, reaching half the total tensioning length.

[0059] Step 5: Measure the alignment of the bottom cable 2. If the alignment matches the design value, tensioning is complete. If the alignment deviates from the design value, compare the actual coordinates of each coordinate control point with the coordinates recorded in Step 2. Identify the coordinate control point whose coordinate deviation exceeds the design tolerance and record it as a deviation point. Adjust the tension length of the face cable 3 near the deviation point by re-tensioning or releasing tension until the coordinates of the deviation point are consistent with the coordinates recorded in Step 2. Of course, if adjusting the tension length of the face cable 3 near the deviation point is insufficient to correct the coordinates of the deviation point, the position of the lower end of the face cable 3 near the deviation point can also be adjusted. However, this is relatively dangerous and should only be considered as a last resort. The lower end of the face cable 3 must first be connected to the foundation with a safety rope. The design tolerance range is specified by the designer, and a deviation of less than 20 mm is generally acceptable.

[0060] Step 6: Install the decorative parts and wall connecting rod 4. The wall connecting rod 4 must be installed last, otherwise it will affect the prestressing.

[0061] like Figure 2 As shown, in step 2, when installing, the lower end of each face rope 3 is first connected to the bottom rope 2, and then the face rope 3 is pulled upward and the upper end of the face rope 3 is connected to the cantilevered hanging rope platform 1.

[0062] If this is not done, even if the hanging rope platform 1 is cantilevered so that there is a certain distance between the face rope 3 and the building, the face rope 3 swinging downwards will still break the glass on the building's exterior wall. After all, the face rope 3 in this embodiment has a diameter of up to 36 mm and is very heavy.

[0063] When installing and tensioning the face cables 3, they are divided into multiple operation groups according to the following rules: the face cables 3 in the same operation group are evenly distributed above the same base cable 2. In each operation group, there is a fixed number of face cables 3 between two adjacent face cables 3. The same face cable 3 is only assigned to one operation group. Each operation group contains at least 5 face cables 3.

[0064] The reason for dividing the operation groups here is that if two face cables 3 that are too close to each other are tensioned at the same time, they will shear the bottom cables 2. Each operation group contains at least 5 face cables 3. If there are too few, the operation will be cumbersome and it will be difficult to form the arch later.

[0065] like Figure 3 As shown, when installing the bottom cable 2, if both ends of the bottom cable 2 need to be anchored on the foundation, first unfold the bottom cable 2 at the projection position of the bottom cable 2 on the ground and anchor both ends of the bottom cable 2 on the foundation, then install a face cable 3 of an operating group on the bottom cable 2 to make the bottom cable 2 arch, and finally install the remaining face cables 3 on the bottom cable 2;

[0066] When installing the bottom cable 2, if one end of the bottom cable 2 needs to be anchored on the foundation and the other end needs to be anchored on the column, first unfold the bottom cable 2 at the projection position of the bottom cable 2 to the ground and anchor one end of the bottom cable 2 on the foundation, then install a face cable 3 of an operating group on the bottom cable 2 to make the bottom cable 2 arch, then anchor the other end of the bottom cable 2 on the column, and finally install the remaining face cables 3 on the bottom cable 2.

[0067] The diameter of the bottom cable 2 here is as high as 118 mm, and each bottom cable 2 weighs 5 tons, so it needs to be unfolded in advance and placed under the installation position. When arching, it is also necessary to cooperate with the surface cable 3 to pull it up.

[0068] In step 4, at each level of tensioning, first take a surface cable 3 of an operating group on a bottom cable 2 for tensioning, then take a surface cable 3 of an operating group on another bottom cable 2 for tensioning, and repeat the cycle until all surface cables 3 have completed the same level of tensioning.

[0069] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A cable curtain wall for a low-rigidity building, wherein the low-rigidity building comprises a large-span steel structure building with a truss roof or a grid roof, wherein the side elevation of the building where the cable curtain wall is located is recorded as the curtain wall setting surface, and the cable curtain wall comprises a plurality of surface cables (3) extending downward from the roof and decorative parts anchored on the surface cables (3), wherein the surface cables (3) are prestressed cables, and is characterized in that: The cable curtain wall further comprises a cantilevered rope platform (1) arranged at the edge of the roof and located above the curtain wall setting surface, and a bottom cable (2) arranged at the bottom of the surface cable (3), wherein the upper end of the surface cable (3) is connected to the bottom of the cantilevered rope platform (1) and the lower end is connected to the bottom cable (2); The bottom cable (2) is a passive cable in an arched shape, and the end of the bottom cable (2) is anchored on the foundation or rigidly connected to a column on the foundation.

2. The shaped cable curtain wall for low-rigidity buildings according to claim 1, characterized in that: The curtain wall setting surface is provided with a main entrance of the building, and the cable curtain wall extends obliquely downward from the roof to form a canopy covering the main entrance; the cable curtain wall is divided into two parts, the part covering the main entrance is recorded as the door curtain, and the other part is recorded as the wall curtain. A bottom cable (2) is respectively arranged under the door curtain and the wall curtain, and the two bottom cables (2) are connected end to end. Both ends of the bottom cable (2) of the wall curtain are anchored on the foundation, and the end of the bottom cable (2) of the door curtain close to the other bottom cable (2) is anchored on the foundation, and the end away from the other bottom cable (2) is anchored on the column.

3. The shaped cable curtain wall for low-rigidity buildings according to claim 2, characterized in that: The side surfaces of the face cables (3) of the wall curtain are connected to the curtain wall setting surface via the wall connecting rods (4), while the side surfaces of the face cables (3) of the door curtain are not connected to the curtain wall setting surface.

4. The shaped cable curtain wall for low-rigidity buildings according to claim 1, characterized in that: The cantilevered rope platform (1) comprises a cantilevered steel beam cantilevered horizontally outward from the edge of the roof, the cantilevered steel beams are arranged at intervals along the edge of the roof and correspond one-to-one with the surface cables (3), and the upper ends of the surface cables (3) are hung on the cantilevered ends of the cantilevered steel beams; the cantilevered steel beams are also paved with platform plates to form a working platform for construction workers to work at high altitude above.

5. The shaped cable curtain wall for low-rigidity buildings according to claim 1, characterized in that: The upper end of the face cable (3) is hingedly connected to the cantilevered rope platform (1) and the lower end is hingedly connected to the bottom cable (2). The plane where the face cable (3) and its projection on the ground are located is recorded as the cable pitch plane. The hinge axis of the end of the face cable (3) is arranged perpendicular to the cable pitch plane. The lower end of the face cable (3) is connected to the bottom cable (2) through a sliding ear plate slidably arranged on the bottom cable (2). The sliding ear plate is clamped on the bottom cable (2) and locked and slid by a bolt. The lower end of the face cable (3) is connected to the sliding ear plate through a pin shaft.

6. The shaped cable curtain wall for low-rigidity buildings according to claim 1, characterized in that: The decorative piece is a horizontally arranged ceramic stick, and the ceramic stick and the surface rope (3) form a grille curtain wall.

7. A construction method for a cable curtain wall for a low-rigidity building, characterized by: The method is used to construct a shaped cable curtain wall for a low-rigidity building as claimed in claim 3, and comprises the following steps: Step 1: Set coordinate control points at intervals along the length direction on the bottom cable (2); Step 2: 3D modeling of the building and the cable curtain wall, and then simulating the tensioning process of the surface cables (3). During the simulation, the state when the shape and posture of the entire cable curtain wall meet the design requirements is taken as the state of tensioning completion, and the coordinates of each control point, the tensioning length and cable force of each surface cable (3) are recorded when tensioning to the final state; Step 3: After the roof construction is completed, the roof dead load is applied, and the cantilevered hanging rope platform (1) is installed and the deformation is stable, install the bottom cable (2) and the surface cable (3); Step 4: Prestress each surface cable (3) so that the tensioned length of each surface cable (3) conforms to the value recorded in step 2, and the deviation between the cable force and the value recorded in step 2 is within a safe range; the surface cables (3) are tensioned in a graded manner, with each grade tensioning being at least one day apart; Step 5: Measure the line shape of the bottom cable (2). If the line shape is consistent with the design value, the tensioning is completed. If the line shape deviates from the design value, compare the deviation between the actual coordinates of each coordinate control point and the coordinates recorded in step 2, find the coordinate control point whose coordinate deviation exceeds the design allowable range and record it as a deflection point. Adjust the tensioning length of the surface cable (3) close to the deflection point by supplementing or releasing the tension, so that the coordinates of the deflection point are consistent with the coordinates recorded in step 2. Step 6: Install the decorative parts and wall tie rods (4).

8. The construction method of a shaped cable curtain wall for a low-rigidity building according to claim 7, characterized in that: In step 2, when installing, the lower end of each face rope (3) is first connected to the bottom rope (2), and then the face rope (3) is pulled upward and the upper end of the face rope (3) is connected to the cantilevered hanging rope platform (1).

9. The construction method of a shaped cable curtain wall for a low-rigidity building according to claim 8, characterized in that: When installing and tensioning, the face cables (3) are divided into multiple operation groups according to the following rules: the face cables (3) in the same operation group are evenly distributed above the same base cable (2); in each operation group, a fixed number of face cables (3) are placed between two adjacent face cables (3); the same face cable (3) is only assigned to one operation group; and each operation group contains at least 5 face cables (3); When installing the bottom cable (2), if both ends of the bottom cable (2) need to be anchored on the foundation, first unfold the bottom cable (2) at the projection position of the bottom cable (2) on the ground and anchor both ends of the bottom cable (2) on the foundation, then install a face cable (3) of an operating group on the bottom cable (2) to make the bottom cable (2) arch, and finally install the remaining face cables (3) on the bottom cable (2); When the bottom cable (2) is installed, if one end of the bottom cable (2) needs to be anchored on the foundation and the other end needs to be anchored on the column, the bottom cable (2) is first unfolded at the projection position of the bottom cable (2) on the ground and one end of the bottom cable (2) is anchored on the foundation, and then a face cable (3) of an operating group is installed on the bottom cable (2) to make the bottom cable (2) arch, and then the other end of the bottom cable (2) is anchored on the column, and finally the remaining face cables (3) on the bottom cable (2) are installed.

10. The construction method of a shaped cable curtain wall for a low-rigidity building according to claim 9, characterized in that: In step 4, when tensioning at each level, first take a surface cable (3) of an operating group on a bottom cable (2) for tensioning, then take a surface cable (3) of an operating group on another bottom cable (2) for tensioning, and repeat the cycle until all surface cables (3) complete the tensioning of the same level.

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