Wet operation installation method for outdoor large-plate granite of elastic structure, curtain wall plate and curtain wall

Abstract

The invention discloses a wet operation installation method for outdoor large-plate granite of an elastic structure, a curtain wall plate and a curtain wall, and the method comprises the following steps: prefabricating a template of a concrete substrate, and arranging a plurality of bushings in the template; an ultra-high performance concrete base plate is formed through formwork pouring; a limiting clamping piece is pre-embedded in the ultra-high performance concrete base plate; a plurality of granite slabs are bonded with the ultra-high performance concrete base plate through the adhesive layers, the adjacent granite slabs are connected and fixed through the limiting clamping pieces, the curtain wall plate is manufactured through the method, and the curtain wall comprises the curtain wall plate. According to the elastic structure outdoor large-plate granite wet operation mounting method, the curtain wall plate and the curtain wall, the ultra-high performance concrete base plate is combined with the granite plate, and compared with the granite plate with the same thickness, the overall compression resistance, shock resistance and crack resistance are high, the structural toughness is good, and the thickness is relatively reduced, so that the use of natural stones and steel structures is reduced, and the cost is reduced. And through the design of a plurality of linings, the assembling effect of the curtain wall plate and an elastic structure can be improved, and the overall deformation resistance and the installation stability of the curtain wall plate can also be improved through the limiting clamping pieces.

Description

Technical Field

[0001] The invention relates to the technical field of outdoor stone curtain wall installation and construction, in particular to an outdoor large-plate granite wet operation installation method with an elastic structure, a curtain wall panel and a curtain wall. Background Art

[0002] Traditional stone exterior curtain walls are generally installed and fixed in the form of dry hanging components. The thickness of the stone is usually required to be greater than 30mm to facilitate the installation of dry hanging parts on the back of the stone. In order to meet the assembly requirements, current stone panels generally choose thicker stones. In the case of a large area, in order to ensure sufficient strength for installation, thicker stone panels will be selected, so the weight will be larger, resulting in poor safety. In addition, the fixing scene of the stone panel is generally an elastic structure or used in an outdoor environment. Therefore, the deformation of the elastic structure will cause damage to the stone panel. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide an elastic structure outdoor large-plate granite wet operation installation method, curtain wall panel and curtain wall. By combining an ultra-high performance concrete base plate with a granite slab, compared with a granite slab of the same thickness, the overall compression, seismic and crack resistance are high, the structural toughness is good, and the thickness is relatively reduced, thereby reducing the use of steel structures and improving the overall construction efficiency. Moreover, through the design of several bushings, the assembly effect with the elastic structure can be improved, and the limit clamping parts can also improve the overall stability of the curtain wall panel.

[0004] The present invention provides a wet operation installation method for outdoor large-plate granite with an elastic structure, comprising the following steps:

[0005] Prefabricate the formwork for the concrete base plate and arrange a number of bushings in the formwork;

[0006] The ultra-high performance concrete base plate is formed by pouring through the formwork;

[0007] Pre-embedding a limit clamping component on the ultra-high performance concrete base plate;

[0008] A plurality of granite slabs are bonded together with the ultra-high performance concrete base plate through the adhesive layer, and adjacent granite slabs are connected through the position-limiting clamping piece.

[0009] In one embodiment, the forming of the ultra-high performance concrete substrate by casting through a formwork further comprises:

[0010] Prepare UHPC premix, fine steel fiber and liquid material according to the preset mix ratio;

[0011] The UHPC premix, fine steel fibers and liquid material are stirred and mixed to form a mixed material;

[0012] The mixed material is poured into a formwork to form an ultra-high performance concrete substrate.

[0013] In one embodiment, embedding the limit clamping parts on the ultra-high performance concrete substrate and coating the adhesive on the ultra-high performance concrete substrate further comprises:

[0014] Determining the corresponding intersection position of the granite slab on the ultra-high performance concrete substrate;

[0015] The limit clamping piece is pre-buried at the intersection position.

[0016] In one embodiment, a plurality of granite slabs are coated with an interface agent and then bonded to the ultra-high performance concrete substrate through the adhesive layer, and adjacent granite slabs are connected and fixed through the position-limiting clamping member, further comprising:

[0017] Choose granite slab;

[0018] sequentially coating an interface agent and an adhesive on the granite slab to form an adhesive layer;

[0019] The granite slab is bonded to the ultra-high performance concrete substrate via the adhesive layer.

[0020] In one embodiment, the limit clamping member includes an inverted "X"-shaped clamping block, an assembly plate and a fixing bolt. Correspondingly, a clamping groove is opened on the granite plate, the inverted "X"-shaped clamping block is clamped in the clamping groove, and the inverted "X"-shaped clamping block and the assembly plate are both bonded to the adhesive layer, and the assembly plate is connected to the ultra-high performance concrete substrate through the fixing bolt.

[0021] The present invention also provides a curtain wall panel, which is obtained by the construction method described above, and includes an ultra-high performance concrete substrate, a bushing, a steel formwork, an adhesive layer, a granite slab and a limit clamp, wherein the bushing is pre-embedded in the ultra-high performance concrete substrate, the ultra-high performance concrete substrate is located in the steel formwork, the ultra-high performance concrete substrate is bonded to the granite slab through the adhesive layer, and the limit clamp is fixed on the ultra-high performance concrete substrate.

[0022] The present invention also provides a curtain wall, comprising the curtain wall panel described above, and also comprising a supporting steel beam, a first connecting member, a pier column and a second connecting member, wherein the supporting steel beam is connected and fixed to the ultra-high performance concrete base plate, the supporting steel beam is connected to the pier column through the first connecting member, and the connecting bolt is connected to the supporting steel beam through a bushing, and the second connecting member is assembled on the pier column for fixing to the roof body.

[0023] In one embodiment, the first connecting member includes a U-shaped seat and a bolt group, the supporting steel beam is located in a U-shaped cavity of the U-shaped seat, and the bolt group fixes the supporting steel beam in the U-shaped cavity.

[0024] In one embodiment, the second connecting member includes a connecting plate and an embedded plate, the embedded plate is connected to the connecting plate, and the connecting plate is fixedly connected to the pier column.

[0025] In one embodiment, the embedded plate includes a connecting section and an extending section, one end of the connecting section is connected to the connecting plate, the other end of the connecting section extends away from the connecting plate and is connected to one end of the extending section, and the other end of the extending section extends away from the connecting section.

[0026] The elastic structure outdoor large-plate granite wet operation installation method, curtain wall panel and curtain wall provided by the present invention combine the granite slab with an ultra-high performance concrete base plate. Compared with the granite slab of the same thickness, the overall compression, seismic and crack resistance are high, the structural toughness is good, and the thickness is relatively reduced, thereby reducing the use of steel structure and improving the overall construction efficiency. Moreover, through the design of several bushings, the assembly effect with the elastic structure can be improved, and the limit clamping parts can also improve the overall stability of the curtain wall panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic flow chart of a wet operation installation method for outdoor large-block granite with an elastic structure provided in the first embodiment of the present invention.

[0029] Figure 2 This is a schematic structural diagram of a curtain wall panel provided in Embodiment 2 of the present invention.

[0030] Figure 3 This is a schematic diagram of the first partial structure of the curtain wall panel provided in the second embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of a second partial structure of a curtain wall panel provided in Embodiment 2 of the present invention.

[0032] Figure 5 This is a schematic structural diagram of a position limiting clamping member of a curtain wall panel provided in the second embodiment of the present invention.

[0033] Figure 6This is a schematic diagram of the structure of the curtain wall provided in Embodiment 3 of the present invention.

[0034] Figure 7 This is a schematic diagram of the assembly of the curtain wall provided in the third embodiment of the present invention.

[0035] Figure 8 The third embodiment of the present invention provides Figure 7 Side view of. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0040] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0041] Embodiment 1

[0042] See also Figures 1 to 3 The wet operation installation method of the elastic structure outdoor large plate granite provided by the present invention comprises the following steps:

[0043] S1, prefabricate a template 104 of an ultra-high performance concrete 101 substrate, and arrange a plurality of bushings 2 in the template 104.

[0044] It can be understood that the template 104 can be made according to the required size of the ultra-high performance concrete substrate 101, the position of the bushing 2 can be arranged according to the position of the supporting steel beam 11 that needs to be assembled later, and can be arranged evenly, and the position where the bushing 2 is arranged on the template 104 is correspondingly provided with perforations.

[0045] S2, forming an ultra-high performance concrete substrate 101 by pouring through the formwork 104.

[0046] It is understandable that the above steps may further include:

[0047] S201, prepare UHPC premix, fine steel fiber and liquid material according to a preset mix ratio.

[0048] It is understandable that the UHPC premix, fine steel fiber and liquid material can be mixed in a mass ratio of 100:2:1.

[0049] S202, stirring and mixing the UHPC premix, fine steel fibers and liquid material to form a mixed material.

[0050] It can be known that the stirring is carried out by a mixer, and the stirring time is determined according to the ambient temperature and humidity, and the stirring is carried out for 15 to 20 minutes until the mixture is uniformly stirred.

[0051] S203 , pouring the mixed material into the formwork to form an ultra-high performance concrete substrate 101 .

[0052] It is understandable that the mixed material can be transported to the location of the formwork by a flatbed truck, and the concrete in the formwork can be poured, scraped, roughened and smoothed to the elevation by workers on site. The mixed material will not cover the bushing 2, and the upper end surface of the bushing 2 can be flush with the upper end surface of the ultra-high performance concrete substrate 101.

[0053] After pouring, the ultra-high performance concrete base plate 101 is cured and covered with a layer of plastic film on the upper part for curing. The predetermined strength can be basically achieved after curing for 24 hours.

[0054] S3, pre-embed the limit clamping member 5 on the ultra-high performance concrete base plate 101.

[0055] The above steps may further include:

[0056] S301 , determining the corresponding connecting position of the granite slab 103 on the ultra-high performance concrete substrate 101 .

[0057] It can be understood that the limiting clamping member 5 is used to connect adjacent granite slabs 103 , and therefore, it is arranged at the intersection of adjacent granite slabs 103 .

[0058] S302, pre-embed the limit clamping member 5 at the connecting position.

[0059] It can be known that the limiting clamping member 5 can be fixed when the ultra-high performance concrete substrate 101 is not solidified.

[0060] S4, a plurality of granite slabs 103 are bonded together with the ultra-high performance concrete substrate 101 through the adhesive layer 102, and adjacent granite slabs 103 are connected and fixed by the limit clamping parts 5, which play a role in limiting the position of the stone slabs during the bonding process between the stone slabs and the concrete substrate, preventing displacement and avoiding natural warping, arching and deformation of the stone slabs due to the release of their own stress.

[0061] The above steps may further include:

[0062] S401, select the granite slab 103.

[0063] It is understandable that the granite slab 103 can be a 2 cm thick litchi surface granite slab.

[0064] S402 , coating an interface agent and an adhesive agent on the granite slab 103 in sequence to form an adhesive layer 102 .

[0065] S403 , bonding the granite slab 103 to the ultra-high performance concrete substrate 101 via the adhesive layer 102 .

[0066] It can be understood that the back of the litchi-faced granite slab can be rolled with a layer of flexible interface agent and a two-component flexible adhesive in sequence, and corresponding slots are opened on adjacent litchi-faced granite slabs. The limit clamping member 5 is fixed on the ultra-high performance concrete substrate 101. At the same time, the limit clamping member 5 is clamped in the slot. It can be known that the ultra-high performance concrete substrate 101 is not demoulded, that is, the curtain wall panel finally formed includes a template 104, and the template 104 can be made of a metal plate.

[0067] The gap between the litchi-faced granite slab and the ultra-high performance concrete base plate 101 can be set according to actual needs. The gap between the two litchi-faced granite slabs can also be fixed with stone-specific AB glue, and plastic film can be used for protection after paving.

[0068] See also Figure 4 and Figure 5In some embodiments, the limiting clamping member 5 includes an inverted “X”-shaped clamping block 501, an assembly plate 502 and a fixing bolt 503. Correspondingly, a clamping groove is provided on the granite plate 103, and the inverted “X”-shaped clamping block 501 is clamped in the clamping groove. The inverted “X”-shaped clamping block 501 and the assembly plate 502 can also be bonded to the adhesive layer 102, and the assembly plate 502 is connected to the ultra-high performance concrete substrate 101 through the fixing bolt 503.

[0069] It can be understood that the assembly plate 502 can be an integral structure with the inverted "X"-shaped clamping block 501, and the inverted "X"-shaped clamping block 501 is clamped in the clamping groove to achieve fixation between adjacent granite slabs 103, thereby effectively preventing the granite slabs 103 from detaching from the ultra-high performance concrete substrate 101. The inverted "X"-shaped clamping block 501 can also be bonded to the ultra-high performance concrete substrate 101 through the adhesive layer 102.

[0070] Embodiment 2

[0071] See also Figures 2 to 6 The present embodiment provides a curtain wall panel, which is obtained by the above-mentioned construction method, and includes an ultra-high performance concrete substrate 101, a bushing 2, a steel formwork 104, an adhesive layer 102, a granite slab 103 and a limiting clamp 5. The bushing 2 is pre-buried in the ultra-high performance concrete substrate 101, the ultra-high performance concrete substrate 101 is located in the steel formwork 104, the ultra-high performance concrete substrate 101 is bonded to the granite slab 103 through the adhesive layer, the limiting clamp 5 is fixed on the ultra-high performance concrete substrate 101, and adjacent granite slabs 103 are fixedly connected through the limiting clamp 5.

[0072] It can be understood that the limit clamp 5 is fixed to the ultra-high performance concrete base plate 101. When the curtain wall panel needs to be fixed, the connecting bolt 3 passes through the bushing 2 to achieve fixation with the supporting steel beam 11. The bushing 2 can be a structure with a stepped inner cavity, which facilitates the fixation of the connecting bolt 3. The stepped inner cavity can also be filled with a plug cover 4. The plug cover 4 can be formed of silicone sealant. The plug cover 4 is filled in the stepped through hole 9, thereby improving the stability of the connection between the connecting bolt 3 and the bushing 2.

[0073] Embodiment 3

[0074] See also Figure 6 The present embodiment provides a curtain wall, further comprising a supporting steel beam 11, a first connecting member 7, a pier column 9 and a second connecting member 8. The supporting steel beam 11 is connected and fixed to the ultra-high performance concrete substrate 101. The supporting steel beam 11 is connected to the pier column 9 through the first connecting member 7, and the connecting bolt 3 passes through the bushing 2 and is connected to the supporting steel beam 11. The second connecting member 8 is assembled on the pier column 9 and is used to be fixed to the roof body 6.

[0075] It can be understood that several curtain wall panels can be on the same horizontal plane, or they can be on different horizontal heights. When adjacent curtain wall panels are not on the same horizontal plane, side panels 10 are arranged between adjacent curtain wall panels. The side panels 10 can be connected and fixed to the ultra-high performance concrete base plate 101 through a supporting steel belt. The supporting steel belt can be connected to the side panels 10 through bolts. A "J"-shaped connector can be arranged on the lower side of the side panel 10. The "J"-shaped connector is clamped in the side panel 7. The "J"-shaped connector is connected and fixed to the pier column 4 through an L-shaped connector. Lamps can also be arranged in the gap between the side panel 10 and the curtain wall panel below, and the supporting steel beams 11 can be radially divergent in the form of annular sectors, which saves a lot of steel compared with the existing system, reduces the overall dead weight, is not restricted by the traditional installation method, is flexible to adjust, has uniform overall load force, good safety, stability and earthquake resistance.

[0076] See also Figure 7 In some embodiments, the first connecting member 7 includes a U-shaped seat 701 and a bolt group, the supporting steel beam 11 is located in the U-shaped cavity of the U-shaped seat 701, and the bolt group fixes the supporting steel beam 8 in the U-shaped cavity.

[0077] It can be understood that the shape of the supporting steel beam 11 can be adapted to the shape of the U-shaped cavity of the U-shaped seat 701. The first connecting member 7 of the structure can be conveniently and stably connected and fixed to the ultra-high performance concrete substrate 101. An adjustment plate can also be provided in the U-shaped seat 701. The number of the adjustment plates 14 can be two, which are symmetrically arranged in the U-shaped seat 701. They can be fixed in the U-shaped seat 701 by a bolt group, and they fit the supporting steel beam 11, so as to adjust the relative angle between the supporting steel beam 11 and the U-shaped seat 701. The bolt group can include a screw 70 3 and nut 704, screw 703 connects U-shaped seat 701 and adjustment plate 14, nut 704 is connected to screw 703, and fits the outer wall of U-shaped seat 701, so as to realize the fixation and adjustment of support steel beam 11, gasket can also be arranged between nut 704 and U-shaped seat 701, improve the stability of nut connection, support plate can also be arranged in U-shaped seat, support plate adjusts support steel beam, so as to realize the height adjustment of support steel beam, reinforcing rib can also be arranged between U-shaped seat and supporting pier column, reinforcing rib can enhance the stability of connection between U-shaped seat and supporting pier column.

[0078] See also Figure 7 In some embodiments, the second connecting member 8 includes a connecting plate 801 and an embedded plate 802 , the embedded plate 802 is connected to the connecting plate 801 , and the connecting plate 801 is fixedly connected to the pier column 9 .

[0079] It can be known that the connecting plate 801 can be welded or bolted to the pier column 9, and the embedded plate 802 can be embedded in the roof body 6. The second connecting member 8 of this structure can facilitate the connection and fixation between the pier column 4 and the roof body 6.

[0080] See also Figure 8 In some embodiments, the embedded plate 802 includes a connecting section 802a and an extension section 802b, wherein one end of the connecting section 802a is connected to the connecting plate 801, and the other end of the connecting section 802a extends away from the connecting plate 801 and is connected to one end of the extension section 802b, and the other end of the extension section 802b extends away from the connecting section 802a.

[0081] It can be understood that the extension section 802b between two adjacent embedded plates 802 can extend in the same direction, or the extension section 802b between two adjacent embedded plates 802 can extend in opposite directions, the connecting section 802a can be vertically connected to the extension section 802b, and the extension section 802b can be placed parallel to the roof body 6, thereby greatly improving the stability of the connection with the roof body 6.

[0082] From the above description, it can be known that the elastic structure outdoor large-plate granite wet operation installation method, curtain wall panel and curtain wall provided by the present invention, through the ultra-high performance concrete base plate combined with the granite slab, compared with the granite slab of the same thickness, the overall compressive, seismic and crack resistance are high, the structural toughness is good, and the thickness is relatively reduced, thereby reducing the use of steel structure and improving the overall construction efficiency. Moreover, through the design of several bushings 2, the assembly effect with the elastic structure can be improved, and the limit clamping parts 5 can also improve the overall stability of the curtain wall panel.

[0083] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A wet installation method for outdoor large-plate granite with elastic structure, characterized in that: The steps include: Prefabricate the formwork for the concrete base plate and arrange a number of bushings in the formwork; The ultra-high performance concrete substrate is formed by pouring through the formwork; Pre-embedding a limit clamping component on the ultra-high performance concrete base plate; A plurality of granite slabs are bonded together with the ultra-high performance concrete base plate through the adhesive layer, and adjacent granite slabs are connected and fixed through the position-limiting clamping piece.

2. The wet installation method for outdoor large-plate granite with elastic structure according to claim 1, characterized in that: The method of forming an ultra-high performance concrete substrate by casting through a formwork further comprises: Prepare UHPC premix, fine steel fiber and liquid material according to the preset mix ratio; The UHPC premix, fine steel fibers and liquid material are stirred and mixed to form a mixed material; The mixed material is poured into a formwork to form an ultra-high performance concrete substrate.

3. The wet installation method for outdoor large-plate granite with elastic structure according to claim 1, characterized in that: The method of embedding a limit clamp on the ultra-high performance concrete substrate and coating an interface agent and an adhesive on the ultra-high performance concrete substrate further comprises: Determining the corresponding intersection position of the granite slab on the ultra-high performance concrete substrate; The limit clamping piece is pre-buried at the intersection position.

4. The wet installation method for outdoor large-plate granite with elastic structure according to claim 1, characterized in that: The method of bonding a plurality of granite slabs to the ultra-high performance concrete base plate through the adhesive layer, and connecting and fixing adjacent granite slabs through the position limiting clamping member, further comprises: Choose granite slab; sequentially coating an interface agent and an adhesive on the granite slab to form an adhesive layer; The granite slab is bonded to the ultra-high performance concrete substrate via the adhesive layer.

5. The wet installation method for outdoor large-plate granite with elastic structure according to claim 1, characterized in that: The limit clamping component includes an inverted "X"-shaped clamping block, an assembly plate and a fixing bolt. Correspondingly, a clamping groove is opened on the granite plate, the inverted "X"-shaped clamping block is clamped in the clamping groove, and the inverted "X"-shaped clamping block and the assembly plate are both bonded to the adhesive layer, and the assembly plate is connected to the ultra-high performance concrete substrate through the fixing bolt.

6. A curtain wall panel, characterized in that: The method is obtained by using the installation method described in any one of claims 1 to 5, comprising an ultra-high performance concrete substrate, a bushing, a steel formwork, an adhesive layer, a granite slab and a limit clamp, wherein the bushing is pre-buried in the ultra-high performance concrete substrate, the ultra-high performance concrete substrate is located in the steel formwork, the ultra-high performance concrete substrate is bonded to the granite slab through the adhesive layer, the limit clamp is fixed on the ultra-high performance concrete substrate, and adjacent granite slabs are fixedly connected by the limit clamp.

7. A curtain wall, characterized in that: The curtain wall panel comprises the curtain wall panel as described in claim 6, and further comprises a supporting steel beam, a first connecting member, a pier column and a second connecting member, wherein the supporting steel beam is connected and fixed to the ultra-high performance concrete base plate, the supporting steel beam is connected to the pier column through the first connecting member, and the connecting bolt is connected to the supporting steel beam through a bushing, and the second connecting member is assembled on the pier column for fixing to the roof body.

8. A curtain wall according to claim 7, characterized in that: The first connecting member includes a U-shaped seat and a bolt group. The supporting steel beam is located in a U-shaped cavity of the U-shaped seat. The bolt group fixes the supporting steel beam in the U-shaped cavity.

9. The curtain wall according to claim 7, characterized in that: The second connecting member includes a connecting plate and an embedded plate, the embedded plate is connected to the connecting plate, and the connecting plate is fixedly connected to the pier column.

10. A curtain wall according to claim 9, characterized in that: The embedded plate includes a connecting section and an extending section, wherein one end of the connecting section is connected to the connecting plate, the other end of the connecting section extends away from the connecting plate and is connected to one end of the extending section, and the other end of the extending section extends away from the connecting section.

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