阅读说明：本技术 一种填充墙墙体结构及其制造方法 (Wall structure of infilled wall and manufacturing method thereof ) 是由 乔林 郑继成 杨庆伟 刘亮 刘德强 牛其增 李克勇 展端云 孙波 于 2021-09-15 设计创作，主要内容包括：本发明提供了一种填充墙墙体结构及其制造方法,涉及房屋建筑工程施工技术领域,采用的方案是：包括基层墙体、复合保温板和复合保温条板,所述复合保温板安装在基层墙体的外侧,在基层墙体上的填充位置具有填充口,所述复合保温条板安装在填充口处,所述复合保温板和复合保温条板的外侧依次设置有找平层、抹面层和饰面层；复合保温条板包括一体式构造的保温层和加气混凝土层,保温层和加气混凝土层之间设置有粘结层,加气混凝土层中设置有外连接件和内连接件,外连接件与穿过保温层的外锚固件连接,内连接件用于固定墙体连接件,墙体连接件固定到墙体上。达到施工时高效省力、墙体的厚度减小的效果。(The invention provides a wall structure of a filler wall and a manufacturing method thereof, which relate to the technical field of building construction engineering construction and adopt the following scheme: the composite heat-insulation board is arranged on the outer side of the base wall, a filling port is formed in a filling position on the base wall, the composite heat-insulation board is arranged at the filling port, and a leveling layer, a plastering layer and a finishing layer are sequentially arranged on the outer sides of the composite heat-insulation board and the composite heat-insulation board; the composite heat-insulation batten comprises a heat-insulation layer and an aerated concrete layer which are integrally constructed, a bonding layer is arranged between the heat-insulation layer and the aerated concrete layer, an outer connecting piece and an inner connecting piece are arranged in the aerated concrete layer, the outer connecting piece is connected with an outer anchoring piece penetrating through the heat-insulation layer, the inner connecting piece is used for fixing a wall connecting piece, and the wall connecting piece is fixed on a wall body. The effects of high efficiency, labor saving and wall thickness reduction during construction are achieved.)

1. The wall structure of the infilled wall is characterized by comprising a base wall body (500), a composite heat-insulation board (400) and a composite heat-insulation batten, wherein the composite heat-insulation board (400) is installed on the outer side of the base wall body (500), a filling opening is formed in a filling position on the base wall body (500), the composite heat-insulation batten is installed at the filling opening, and a leveling layer (300), a plastering layer (200) and a finishing layer (100) are sequentially arranged on the outer sides of the composite heat-insulation board (400) and the composite heat-insulation batten; the composite heat-insulating batten comprises a heat-insulating layer (1) and an aerated concrete layer (2) which are integrally constructed, the heat-insulating layer (1) is positioned on the outer side of the aerated concrete layer (2), a bonding layer (3) is arranged on the inner side surface of the heat-insulating layer (1), the bonding layer (3) is positioned between the heat-insulating layer (1) and the aerated concrete layer (2), outer connecting pieces (9) and inner connecting pieces (10) which are arranged at intervals are arranged in the aerated concrete layer (2), outer anchoring pieces (8) are installed on the heat-insulating layer (1), the outer anchoring pieces (8) penetrate through the heat-insulating layer (1) and extend into the aerated concrete layer (2) to be connected with the outer connecting pieces (9), a wall connecting piece (4) is arranged on the inner side of the aerated concrete layer (2), and the wall connecting piece (4) is arranged at the edge of the inner side surface of the aerated concrete layer (2), the wall connecting piece (4) is connected to the aerated concrete layer (2) through the inner anchoring piece (5), the inner anchoring piece (5) extends into the aerated concrete layer (2) to be connected with the inner connecting piece (10), and the wall connecting piece is fixedly connected to the base wall (500) through the connecting piece.

2. Infilled wall structure according to claim 1, characterised in that the wall connectors (4) comprise slat connectors and wall connectors arranged at an angle, the inner anchors (5) passing through the slat connectors and fastening them to the aerated concrete layer (2), the wall connectors being secured to the foundation wall (500) by means of connectors.

3. A infilled wall structure according to claim 2, characterised in that the wall connection (4) is an L-shaped panel, both panels of which are provided with mounting holes.

4. A infilled wall structure according to any one of claims 1-3, characterised in that the outer connectors (9) are steel mesh sheets, the outer connectors (9) being cast together with the aerated concrete layer (2).

5. A infilled wall structure according to any of claims 1-3, characterised in that the inner connectors (10) are steel mesh or steel reinforcement, the inner connectors (10) being cast together with the aerated concrete layer (2).

6. A infilled wall structure according to any of claims 1-3, characterised in that the adhesive layer (3) is a layer of adhesive mortar.

7. A filler wall structure as claimed in claim 6, wherein the inner side of the insulating layer (1) is provided with a groove (6), and the groove (6) is filled with bonding mortar or aerated concrete.

8. A infilled wall structure according to any one of claims 1-3, characterised in that the outer side of the insulation layer (1) is provided with a reinforcing mortar layer (7).

9. A infilled wall structure according to one of claims 1-3, characterised in that the aerated concrete layer (2) has a thickness of 100-200 mm.

10. A method of manufacturing a infilled wall structure, comprising the steps of:

a1: installing a composite heat-insulating batten at a filling port on a base wall (500), and fixing a wall connecting piece (4) on the composite heat-insulating batten to the base wall (500) by using a connecting piece;

a2: gaps among the composite heat-insulation battens and gaps between the composite heat-insulation battens and the base wall (500) need to be filled with foam strips or filled with polyurethane foam rubber;

a3: leveling, plastering and facing are sequentially carried out on the composite heat-insulation board (400) and the outer side of the composite heat-insulation batten; wherein, the junction between the composite heat-insulating batten and the base wall (500) needs to be additionally provided with a steel wire mesh or a glass fiber mesh for strengthening anti-cracking treatment when in leveling;

wherein the composite heat-insulating batten comprises a heat-insulating layer (1) and an aerated concrete layer (2) which are integrally constructed, the heat-insulating layer (1) is positioned at the outer side of the aerated concrete layer (2), a bonding layer (3) is arranged on the inner side surface of the heat-insulating layer (1), the bonding layer (3) is positioned between the heat-insulating layer (1) and the aerated concrete layer (2), outer connecting pieces (9) and inner connecting pieces (10) which are arranged at intervals are arranged in the aerated concrete layer (2), outer anchoring pieces (8) are arranged on the heat-insulating layer (1), the outer anchoring pieces (8) penetrate through the heat-insulating layer (1) and extend into the aerated concrete layer (2) to be connected with the outer connecting pieces (9), a wall connecting piece (4) is arranged at the inner side of the aerated concrete layer (2), and the wall connecting piece (4) is arranged at the edge of the inner side surface of the aerated concrete layer (2), the wall connecting piece (4) is connected to the aerated concrete layer (2) through an inner anchoring piece (5), and the inner anchoring piece (5) extends into the aerated concrete layer (2) and is connected with an inner connecting piece (10); the wall connecting piece (4) is provided with a mounting hole.

Technical Field

The invention relates to the technical field of building construction engineering construction, in particular to a wall structure of a filler wall and a manufacturing method thereof.

Background

Most of the filling wall building modes in the building construction process are still traditional building block building, the used building blocks are generally sintered hollow bricks, autoclaved aerated concrete layer building blocks, light aggregate concrete small hollow building blocks and the like, and the building is carried out by workers one by one during construction. The structure and the masonry mode of the filler wall have the problems of poor heat preservation and sound insulation effects on the one hand, and on the other hand, the filler wall can be influenced by construction technology and building blocks of workers, so that the construction efficiency is low, the quality of the filler wall construction cannot be guaranteed, the filler wall is mainly characterized in that the perpendicularity and the flatness deviation of the wall are large and easy to crack, and meanwhile, the construction difficulty of a later-stage decorative surface can be increased.

In the prior art, in order to increase the heat insulation effect of the filler wall, some designs also can increase the heat insulation layer in the filler wall, and usually adopt the mode of embodying pouring with the wall when installing the heat insulation layer, the construction is troublesome, and the construction efficiency is seriously influenced. If the heat-insulating layer is combined with the lighter aerated concrete layer building blocks in advance, the aerated concrete layer building blocks can be directly used in the building process, and the construction efficiency can be improved. However, the aerated concrete layer building blocks are thick and difficult to bond, the aerated concrete layer building blocks and the aerated concrete layer building blocks are not firmly bonded, the heat-insulating layer and the building block layer are easy to deviate during manufacturing, the integrity is poor, the construction requirements cannot be met, great difficulty is brought to the construction of a filling wall, and the construction efficiency is low. In addition, because heat preservation and building block are under construction respectively, the thermal conductivity and the heat preservation effect that bring are considered in both thickness stack during wall body design often make final wall body structure thicker, and the rate of getting into the room is low.

Therefore, the problem that the wall structure of the filler wall and the manufacturing method thereof are urgently needed to be solved is researched and developed aiming at the current situation that the building blocks and the heat insulation layer are difficult to install and the wall body is thick in the actual construction process of the filler wall.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a wall structure of a filler wall, which aims to solve the problems of difficulty in construction of the filler wall and thicker wall body and achieve the effects of high efficiency, labor saving and reduction of the thickness of the wall body during construction.

The technical scheme adopted by the invention for solving the technical problems is as follows: a wall structure of a infilled wall comprises a base wall, a composite heat-insulation board and a composite heat-insulation batten, wherein the composite heat-insulation board is arranged on the outer side of the base wall, a filling opening is formed in a filling position on the base wall, the composite heat-insulation batten is arranged at the filling opening, and a leveling layer, a plastering layer and a finishing layer are sequentially arranged on the outer sides of the composite heat-insulation board and the composite heat-insulation batten; the composite heat-insulating batten comprises a heat-insulating layer and an aerated concrete layer which are integrally constructed, the heat-insulating layer is positioned on the outer side of the aerated concrete layer, a bonding layer is arranged on the surface of the inner side of the heat-insulating layer, and the bonding layer is positioned between the heat-insulating layer and the aerated concrete layer, is used for firmly bonding the heat-insulating layer and the aerated concrete layer and preventing the inorganic and organic materials from being deformed and separated due to large characteristic difference; the aerated concrete layer is internally provided with outer connecting pieces and inner connecting pieces which are arranged at intervals, the heat-insulating layer is provided with outer anchoring pieces, the outer anchoring pieces penetrate through the heat-insulating layer and extend into the aerated concrete layer to be connected with the outer connecting pieces, the outer connecting pieces are arranged in the aerated concrete layer and connected with the outer anchoring pieces on the heat-insulating layer, the firmness of connection between the heat-insulating layer and the aerated concrete layer is further enhanced, and a double-layer guarantee is formed together with the bonding layer; the inner side of the aerated concrete layer is provided with a wall connecting piece, the wall connecting piece is arranged at the edge of the inner side surface of the aerated concrete layer and connected to the aerated concrete layer through an inner anchoring piece, the inner anchoring piece extends into the aerated concrete layer to be connected with an inner connecting piece, the wall connecting piece is fixedly connected to a base layer wall through a connecting piece, the wall connecting piece is arranged on the inner side of the aerated concrete layer and directly connected with the side wall of the infilled wall through the wall connecting piece during installation, so that the wall connecting piece and the infilled wall are firmly connected, the position adjustment is easy, the installation is efficient and convenient, the wall connecting piece is fastened to the aerated concrete layer through the inner anchoring piece, the inner anchoring piece is connected with the inner connecting piece preset during pouring, the installation of the wall connecting piece is realized, the firm connection effect is strengthened, and the composite heat-insulation batten with heavier weight is adapted. The heat preservation effect can obtain obvious improvement, for the mode that building block and heat preservation were under construction respectively, the gap between building block and the heat preservation has been saved, because composite insulation board's lateral surface will reach basic parallel and level's purpose with the lateral surface of composite insulation slat, the event can make the gross thickness adaptation composite insulation slat thickness of composite insulation slat and basic unit's wall body, composite insulation slat thickness reduces for the thickness that current heat preservation and building block installed respectively, the event can reduce wall thickness when the design, realize reducing wall thickness's purpose, effectively increase the percentage of living. Meanwhile, the integration level is high, the assembly and installation are realized, and the construction efficiency is greatly improved.

Further, the wall body connecting piece includes slat connecting portion and wall body connecting portion, slat connecting portion and wall body connecting portion angulation setting, interior anchor passes behind the slat connecting portion with the wall body connecting piece fastening on aerated concrete layer, the wall body connecting portion link firmly to the basic unit's wall body on through the connecting piece. The batten connecting part and the wall connecting part are arranged at an angle, the batten connecting part is used for the inner anchoring part to fasten the batten connecting part to the aerated concrete layer, and the wall connecting part is used for being connected with a wall body to adapt to the matching angle between the batten and the wall body, so that the purpose of being convenient to connect is achieved.

Further, the wall connecting piece is an L-shaped plate, and two plates of the L-shaped plate are provided with mounting holes. Can realize the perpendicular connection with the wall body lateral wall, guarantee the fastness of connection.

Further, the outer connecting piece is a steel wire mesh, and the outer connecting piece and the aerated concrete layer are cast together. Plays a role in connection firmness.

Further, the inner connecting piece is a steel wire mesh or a steel bar, and the inner connecting piece and the aerated concrete layer are cast together. Plays a role in connection firmness.

Further, the bonding layer is a bonding mortar layer.

Furthermore, a groove is formed in the inner side face of the heat insulation layer, and bonding mortar or aerated concrete is arranged in the groove. The groove has the effect of interlocking the heat-insulating layer with the bonding layer or the heat-insulating layer with the aerated concrete layer, so that the integral connection function is enhanced.

Furthermore, a reinforced mortar layer is arranged on the outer side of the heat-insulating layer.

Further, the thickness of the aerated concrete layer is 100-200 mm. Preferably 120 mm.

In addition, the invention also provides a manufacturing method of the wall structure of the infilled wall, which comprises the following steps:

a1: installing a composite heat-insulating batten at a filling port on the base wall, and fixing a wall connecting piece on the composite heat-insulating batten to the base wall by using a connecting piece;

a2: gaps between the composite heat-insulation battens and the base wall body need to be filled with foam strips or filled with polyurethane foam rubber;

a3: leveling, plastering and facing are sequentially carried out on the outer sides of the composite heat-insulation board and the composite heat-insulation batten; wherein, the junction between the composite heat-insulating batten and the base wall needs to be additionally provided with a steel wire mesh or a glass fiber mesh for strengthening anti-cracking treatment when in leveling;

wherein the composite heat-insulating batten comprises a heat-insulating layer and an aerated concrete layer which are integrally constructed, the heat-insulating layer is positioned at the outer side of the aerated concrete layer, the inner side plate surface of the heat-insulating layer is provided with a bonding layer which is positioned between the heat-insulating layer and the aerated concrete layer, the aerated concrete layer is provided with outer connecting pieces and inner connecting pieces which are arranged at intervals, the heat-insulating layer is provided with outer anchoring pieces, the outer anchoring part penetrates through the heat-insulating layer and extends into the aerated concrete layer to be connected with the outer connecting part, by arranging the outer connecting piece in the aerated concrete layer and connecting the outer connecting piece with the outer anchoring piece on the heat-insulating layer, the inner side of the aerated concrete layer is provided with the wall connecting piece, the wall connecting piece is arranged at the edge of the inner side surface of the aerated concrete layer, is connected to the aerated concrete layer through an inner anchoring piece, and extends into the aerated concrete layer to be connected with the inner connecting piece; the wall connecting piece is provided with a mounting hole.

According to the technical scheme, the invention has the following advantages:

this scheme provides a infilled wall structure and manufacturing method thereof, the heat preservation effect can obtain obvious improvement, for the mode that building block and heat preservation were under construction respectively, the gap between building block and the heat preservation has been saved, because the lateral surface of compound insulation board will reach basic parallel and level's purpose with the lateral surface of compound insulation slat, the event can make the gross thickness adaptation compound insulation slat thickness of compound insulation slat and basic unit's wall body, compound insulation slat thickness reduces for the thickness that current heat preservation and building block installed respectively, the event can reduce wall thickness when the design, realize reducing wall thickness's purpose, effectively increase the rate of housing. Meanwhile, the integration level is high, the assembly and installation are realized, and the construction efficiency is greatly improved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view of a composite heat-insulating lath according to an embodiment of the invention.

FIG. 3 is a front view of a composite insulating plank according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view taken at a-a in fig. 3.

FIG. 5 is a rear view of a composite insulating plank according to an embodiment of the present invention.

Fig. 6 is a cross-sectional view at B-B in fig. 5.

In the figure, 1, a heat preservation layer, 2, an aerated concrete layer, 3, a bonding layer, 4, a wall connecting piece, 5, an inner anchoring piece, 6, a groove, 7, a reinforced mortar layer, 8, an outer anchoring piece, 9, an outer connecting piece, 10, an inner connecting piece, 100, a decorative layer, 200, a plastering layer, 300, a leveling layer, 400, a composite heat preservation plate, 500 and a base wall body.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

Detailed description of the preferred embodiment 1

As shown in fig. 1 to 6, the present embodiment provides a infilled wall structure, including a base wall 500, a composite insulation board 400 and a composite insulation batten, wherein the composite insulation board 400 is installed outside the base wall 500, a filling port is formed at a filling position on the base wall 500, the composite insulation batten is installed at the filling port, and a leveling layer 300, a plastering layer 200 and a finishing layer 100 are sequentially arranged outside the composite insulation board 400 and the composite insulation batten; the composite heat-insulating batten comprises a heat-insulating layer 1 and an aerated concrete layer 2 which are integrally constructed, wherein the heat-insulating layer 1 is positioned on the outer side of the aerated concrete layer 2, an adhesive layer 3 is arranged on the surface of the inner side of the heat-insulating layer 1, and the adhesive layer 3 is positioned between the heat-insulating layer 1 and the aerated concrete layer 2, is used for firmly bonding the heat-insulating layer 1 and the aerated concrete layer 2 and preventing the inorganic and organic materials from being deformed and separated due to large characteristic difference; the aerated concrete layer 2 is internally provided with outer connecting pieces 9 and inner connecting pieces 10 which are arranged at intervals, the outer anchoring pieces 8 are arranged on the heat-insulating layer 1, the outer anchoring pieces 8 penetrate through the heat-insulating layer 1 and extend into the aerated concrete layer 2 to be connected with the outer connecting pieces 9, the outer anchoring pieces 9 are arranged in the aerated concrete layer 2 and are connected with the outer anchoring pieces 8 on the heat-insulating layer 1, the firmness of connection between the heat-insulating layer 1 and the aerated concrete layer 2 is further enhanced, and a double-layer guarantee is formed together with the bonding layer 3; the inner side of the aerated concrete layer 2 is provided with a wall connecting piece 4, the wall connecting piece 4 is arranged at the edge of the inner side surface of the aerated concrete layer 2, the wall connecting piece 4 is connected to the aerated concrete layer 2 through an inner anchoring piece 5, the inner anchoring piece 5 extends into the aerated concrete layer 2 and is connected with an inner connecting piece 10, the wall connecting piece 4 is used for being fixed on a base layer wall 500, the thickness of the aerated concrete layer 2 is 100-200mm, and the scheme is preferably 120 mm. Through setting up wall connection 4 in aerated concrete's inboard, directly be connected with the filler wall lateral wall through wall connection 4 during the installation, make both firm in connection, easily position adjustment, it is high-efficient convenient to install, and fasten wall connection 4 to aerated concrete layer 2 through interior anchor 5, interior anchor 5 is connected with interior connecting piece 10 of just predetermineeing when pouring, and it is firm to realize the installation of wall connection 4, strengthens the connection effect, adapts to heavier compound insulation slat. The heat preservation effect can obtain obvious improvement, for the mode that building block and heat preservation 1 were under construction respectively, the gap between building block and the heat preservation 1 has been saved, because the lateral surface of composite insulation board 400 will reach basic parallel and level's purpose with the lateral surface of composite insulation slat, the event can make the gross thickness adaptation composite insulation slat thickness of composite insulation slat and basic unit's wall body 500, the thickness that composite insulation slat thickness was installed respectively for current heat preservation 1 and building block reduces, the event can reduce wall thickness when the design, realize reducing wall thickness's purpose, effectively increase the rate of housing. Meanwhile, the integration level is high, the assembly and installation are realized, and the construction efficiency is greatly improved. In this scheme, heat preservation 1 can be insulation board such as extruded sheet, polyurethane board, polyphenyl board rock wool board.

Wherein, wall connection spare 4 includes slat connecting portion and wall connection portion, slat connecting portion and wall connection portion angulation setting, interior anchor 5 passes behind the slat connecting portion with wall connection spare 4 fastening on aerated concrete layer 2, wall connection portion links firmly on basic unit's wall body 500 through the connecting piece. Slat connecting portion and wall connection portion angulation setting, and on slat connecting portion were used for interior anchor 5 to fasten it to aerated concrete layer 2, wall connection portion were used for with wall connection, the purpose of being convenient for to connect is realized to the cooperation angle between adaptation slat and the wall body, wall connection 4 is the L template, all be provided with the mounting hole on two boards of L template, can realize guaranteeing the fastness of connection with the perpendicular of wall body lateral wall is connected.

The outer connecting piece 9 is a steel wire mesh, and the outer connecting piece 9 and the aerated concrete layer 2 are poured and formed together. Plays a role in connection firmness; the in-connection piece 10 is also a steel wire mesh or a steel bar, and the in-connection piece 10 and the aerated concrete layer 2 are poured together to form the aerated concrete structure, so that the connection firmness is realized.

The bonding layer 3 is a bonding mortar layer, the inner side surface of the heat insulation layer 1 is provided with a groove 6, bonding mortar or aerated concrete is arranged in the groove 6, the groove 6 has an occlusion effect of the heat insulation layer 1 and the bonding layer 3 or the heat insulation layer 1 and the aerated concrete layer 2, and an integral connection function is enhanced.

In addition, a reinforced mortar layer 7 is arranged on the outer side of the heat-insulating layer 1.

Detailed description of the preferred embodiment 2

The specific embodiment provides a manufacturing method of a wall structure of a filler wall, which comprises the following steps:

a1: installing a composite heat-insulating batten at a filling port on the base wall body 500, and fixing a wall body connecting piece 4 on the composite heat-insulating batten on the base wall body 500 by using a connecting piece;

a2: gaps between the composite heat-insulating battens and the base wall body 500 need to be filled with foam strips or filled with polyurethane foam rubber;

a3: leveling, plastering and facing are sequentially carried out on the outer sides of the composite heat-insulation board and the composite heat-insulation batten; wherein, the junction between the composite heat-insulating batten and the base wall 500 needs to be additionally provided with a steel wire mesh or a glass fiber mesh for strengthening anti-cracking treatment when in leveling;

the composite heat-insulating batten comprises a heat-insulating layer 1 and an aerated concrete layer 2 which are integrally constructed, wherein the heat-insulating layer 1 is positioned on the outer side of the aerated concrete layer 2, an adhesive layer 3 is arranged on the surface of the inner side of the heat-insulating layer 1, the adhesive layer 3 is positioned between the heat-insulating layer 1 and the aerated concrete layer 2, outer connecting pieces 9 and inner connecting pieces 10 which are arranged at intervals are arranged in the aerated concrete layer 2, outer anchoring pieces 8 are arranged on the heat-insulating layer 1, the outer anchoring pieces 8 penetrate through the heat-insulating layer 1 and extend into the aerated concrete layer 2 to be connected with the outer connecting pieces 9, the outer connecting pieces 9 are arranged in the aerated concrete layer 2 to be connected with the outer anchoring pieces 8 on the heat-insulating layer 1, a wall connecting piece 4 is arranged on the inner side of the aerated concrete layer 2, the wall connecting piece 4 is arranged at the edge of the inner side surface of the aerated concrete layer 2, and the wall connecting piece 4 is connected on the aerated concrete layer 2 through the inner anchoring pieces 5, the inner anchoring part 5 extends into the aerated concrete layer 2 and is connected with the inner connecting part 10; the wall connecting piece 4 is provided with a mounting hole.

The terms "upper", "lower", "outside", "inside", and the like in the description and claims of the present invention and the above-described drawings (if any) are used for distinguishing relative positions without necessarily being construed qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.