Connecting joint of prefabricated rail top air duct and middle plate

Abstract

The utility model relates to a connecting node of a prefabricated rail top air duct and a middle plate, which comprises a hanging bar pre-buried in a hanging wall, the upper end of the hanging bar penetrates out of a reserved hole of a main body middle plate and is screwed with a fixing nut, and a clamping ring base plate is clamped between the bottom of the fixing nut and the top of the main body middle plate. The periphery of the hanging bar between the top of the hanging wall and the bottom of the main body middle plate is filled with a macromolecular foaming fixed template; grouting materials are injected among the hanging bar, the reserved hole of the main body middle plate and the macromolecular foaming fixed template; the clamping ring base plate comprises two hinged steel base plates, semicircular through holes are formed in the middles of the butt joint faces of the two steel base plates, the hanging bar penetrates through a circular hole formed by the two semicircular through holes, and the two steel base plates are connected through a connecting gasket, a fixed screw and a movable screw. According to the utility model, the rail top air duct and the main body middle plate can be stably connected; traditional formwork erecting and dismantling are not needed during grouting material filling, time is saved, and the construction progress is accelerated; the joints can be adjusted up and down, and the assembling precision and the mounting quality of the rail top air duct are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of subway construction in municipal engineering, in particular to a connection node between a prefabricated rail top air duct and a middle plate. Background Art

[0002] In the field of municipal engineering rail transit, the rail-top air duct of the subway is an auxiliary structure, which is usually constructed after the main structure is completed. In order to avoid the complexity of cast-in-place structure construction and save construction time, prefabricated rail-top air ducts have been increasingly used in recent years. At present, the connection between the hanging wall and the main body middle plate of the rail-top air duct is mostly achieved through pre-buried hangers, and the flatness of the bottom of the main body middle plate is difficult to meet the requirements of close fit between the hanging wall and the middle plate. The installation quality of the rail-top air duct is not easy to guarantee, and the gap between the hanging wall and the bottom of the middle plate needs to be filled with grouting material, and the work of supporting and dismantling the formwork is cumbersome.

[0003] The Chinese invention patent application with publication number CN114991845A discloses an assembled installation system for prefabricated rail-top air ducts in the bottom space, which effectively improves the tensile strength of the components, improves the overall structural strength and stability of the rail-top air duct, and makes the safety factor and quality of the rail-top air duct higher. However, there are also areas that need to be improved in its structure. For example, it uses ordinary steel pads, which cannot be opened and closed, and are not post-installed, and the installation precision control needs to be strengthened; the grouting adopts the method of reverse grouting, and the grouting part needs to be equipped with metal threaded pipes, which is relatively cumbersome. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and provides a connection node between a prefabricated rail top air duct and a middle plate.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A connection node between a prefabricated rail top air duct and a middle plate, comprising a hanging rod pre-buried in a hanging wall and passing through the top of the hanging wall, the upper end of the hanging rod passing through a reserved hole of a main body middle plate and being screwed with a fixing nut, a clamping ring pad being sandwiched between the bottom of the fixing nut and the top of the main body middle plate, a polymer foam fixing template being filled around the hanging rod between the top of the hanging wall and the bottom of the main body middle plate, and grouting material being injected between the hanging rod and the reserved hole of the main body middle plate and the polymer foam fixing template;

[0007] The snap ring pad includes two steel pads, one end of the butt joint surfaces of the two steel pads are hinged by a hinge axis, and a semicircular through hole is provided in the middle of the butt joint surfaces of the two steel pads. The hanger passes through the circular hole formed by the two semicircular through holes. A connecting gasket is installed at the unhinged end of the upper surface of one of the steel pads through a fixed screw, and a movable screw is installed at the unhinged end of the upper surface of the other steel pad and a grouting hole is opened near the semicircular through hole. The grouting hole is located above the reserved hole in the middle plate of the main body, and a connecting hole is provided on the connecting gasket corresponding to the movable screw. When the two steel pads are closed, the movable screw is inserted into the connecting hole.

[0008] The diameter of the suspension rod is 25-40mm.

[0009] The embedded length of the hanger bar in the suspended wall shall not be less than 800mm, and the length of the hanger bar exposed from the fixing nut shall be 30-40mm.

[0010] The width of the steel plate is half of its length. The length of the steel plate is 160-200mm and the thickness is not less than 20mm.

[0011] The diameter of the reserved hole in the main body middle plate is 60-80mm.

[0012] The beneficial effects of the utility model are as follows: the utility model can ensure that the connection between the rail top air duct and the main body middle plate is firm and the connection strength is high, thereby ensuring that the rail top air duct is reliably constrained; when filling the gap between the hanging wall and the bottom of the middle plate with grouting material, there is no need for traditional formwork and demolding, thus saving on-site operation time and speeding up construction progress; the nodes can be adjusted up and down, thereby improving the assembly accuracy and installation quality of the rail top air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0015] Figure 3 This is the state diagram of the snap ring and gasket when they are closed;

[0016] Figure 4 This is a state diagram when the snap ring backing plate is opened;

[0017] In the figure: 1-hanging rod; 2-fixing nut; 3-clamping ring plate; 4-polymer foam fixing template; 5-grouting material; 6-hanging wall; 7-main body middle plate; 8-main body side wall; 9-air duct bottom plate; 10-decorative layer;

[0018] 31- steel pad; 32- hinge axis; 33- semicircular through hole; 34- fixed screw; 35- connecting gasket; 36- movable screw; 37- grouting hole; 38- connecting hole;

[0019] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0024] A connection node between a prefabricated rail top air duct and a middle plate, such as Figure 1 , Figure 2 As shown, it includes a hanging rod 1 embedded in the hanging wall 6 and passing through the top of the hanging wall 6, the upper end of the hanging rod 1 passes through the reserved hole of the main body middle plate 7 and is screwed with a fixing nut 2, a clamping ring pad 3 is clamped between the bottom of the fixing nut 2 and the top of the main body middle plate 7, a polymer foam fixing template 4 is filled on the periphery of the hanging rod 1 between the top of the hanging wall 6 and the bottom of the main body middle plate 7, and grouting material 5 is injected between the hanging rod 1 and the reserved holes of the main body middle plate 7 and the polymer foam fixing template 4.

[0025] The main body middle plate 7 is located on one side of the main body side wall 8 , a decorative layer 10 is provided above the main body middle plate 7 , the main body middle plate 7 is connected to the hanging wall 6 through a connecting node, and finally the air duct bottom plate 9 is erected between the two hanging walls 6 .

[0026] The hanging bar 1 is a threaded steel bar with a diameter of 25mm-40mm. The embedded length in the hanging wall 6 of the rail top air duct is not less than 800mm, and the length of the fixing nut 2 exposed at the top is preferably 30mm-40mm.

[0027] The required length of the hanger bar 1 can be determined according to the thickness of the main body mid-plate 7.

[0028] The model and size of the fixing nut 2 match the suspension rod 1.

[0029] Snap ring plate 3 Figure 3 , Figure 4 As shown, it includes two steel pads 31, one end of the butt joint of the two steel pads 31 is hinged by a hinge shaft 32, and the middle part of the butt joint of the two steel pads 31 is provided with a semicircular through hole 33, and the hanger 1 passes through the circular hole formed by the two semicircular through holes 33. A connecting gasket 35 is installed on the unhinged end of the upper surface of one of the steel pads 31 through a fixed screw 34, and a movable screw 36 is installed on the unhinged end of the upper surface of the other steel pad 31, and a grouting hole 37 is opened near the semicircular through hole 33. The grouting hole 37 is located above the reserved hole of the main body middle plate 7, and a connecting hole 38 is provided on the connecting gasket 35 corresponding to the movable screw 36. When the two steel pads 31 are closed, the movable screw 36 is penetrated into the connecting hole 38.

[0030] The length of the steel plate 31 is preferably 160mm-200mm, the width is half of the length, and the thickness is not less than 20mm; a grouting hole 37 is opened near the semicircular through hole 33 of a steel plate 31, and the specific position depends on the position of the hanger 1 and corresponds to the size of the reserved hole of the main body middle plate 7.

[0031] The clamping ring pad 3 can be opened and closed, and is installed in a post-installation manner. Combined with the position of the fixing nut 2, the installation accuracy can be controlled, so that each air duct unit is consistent in height after assembly.

[0032] The polymer foaming fixed template 4 is made of polymer foaming material.

[0033] The grouting material 5 is a cement-based grouting material, with high-strength material as aggregate.

[0034] The snap ring plate 3 is prefabricated in the factory, and the two steel plates 31 are in a merged state. The hanging wall 6 is lifted or the rail top air duct is lifted, and the hanging bar 1 passes through the reserved hole of the main body middle plate 7. The diameter of the reserved hole is preferably 60mm-80mm; unscrew the movable screw 36 on the snap ring plate 3, so that one end of the two steel plates 31 is separated, the hanging bar 1 is wrapped, and falls on the top surface of the main body middle plate 7. The movable screw 36 passes through the connecting gasket 35 and is tightened. The two steel plates 31 are merged again to achieve the initial connection between the hanging wall 6 and the main body middle plate 7. If the top of the main body middle plate 7 is not flat, it can be fixed by rotating the fixed screw 36 on the top of the hanging bar 1. The fixed nut 2 is used to adjust to achieve high-precision assembly between the hanging walls 6; according to the size of the gap between the bottom of the main body middle plate 1 and the hanging wall 6, the polymer foam fixed template 4 is filled on both sides of the gap and the outside is smoothed; the grouting material 5 is injected into the gap between the hanging bar 1 and the hole of the main body middle plate 7, and into the gap between the hanging wall 6 and the bottom of the main body middle plate 7 through the grouting hole 37 on the clamping ring pad 3. The grouting is from top to bottom, which is more convenient, that is, the rail top air duct and the main body middle plate 7 are connected again through the polymer foam fixed template 4 and the grouting material 5.

[0035] The utility model can ensure that the rail top air duct and the main body middle plate 7 are firmly connected and the connection strength is high, thereby ensuring that the rail top air duct is reliably constrained; when the gap between the hanging wall 6 and the middle plate bottom 7 is filled with grouting material 5, there is no need for traditional formwork and demolding, which saves on-site operation time and speeds up construction progress; the nodes can be adjusted up and down, thereby improving the assembly accuracy and installation quality of the rail top air duct.

[0036] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A connection node between a prefabricated rail top air duct and a middle plate, characterized in that: It comprises a hanging rod (1) pre-buried in a hanging wall (6) and passing through the top of the hanging wall (6); the upper end of the hanging rod (1) passes through a reserved hole of a main body middle plate (7) and is screwed with a fixing nut (2); a clamping ring pad (3) is sandwiched between the bottom of the fixing nut (2) and the top of the main body middle plate (7); a polymer foam fixing template (4) is filled around the hanging rod (1) between the top of the hanging wall (6) and the bottom of the main body middle plate (7); and a grouting material (5) is injected between the hanging rod (1) and the reserved hole of the main body middle plate (7) and the polymer foam fixing template (4); The snap ring pad (3) comprises two steel pads (31), one end of the butt joint surfaces of the two steel pads (31) are hinged via a hinge shaft (32), a semicircular through hole (33) is provided in the middle of the butt joint surfaces of the two steel pads (31), the suspension rod (1) passes through the circular hole formed by the two semicircular through holes (33), a connecting pad (35) is installed on the unhinged end of the upper surface of one of the steel pads (31) via a fixed screw (34), a movable screw (36) is installed on the unhinged end of the upper surface of the other steel pad (31) and a grouting hole (37) is opened near the semicircular through hole (33), the grouting hole (37) is located above the reserved hole of the main body middle plate (7), a connecting hole (38) is provided on the connecting pad (35) corresponding to the movable screw (36), and when the two steel pads (31) are closed, the movable screw (36) is inserted into the connecting hole (38).

2. A connection node between a prefabricated rail top air duct and a middle plate according to claim 1, characterized in that: The diameter of the suspension rod (1) is 25-40 mm.

3. A connection node between a prefabricated rail top air duct and a middle plate according to claim 2, characterized in that: The embedded length of the hanging rod (1) in the hanging wall (6) is not less than 800 mm, and the length of the hanging rod (1) exposed from the fixing nut (2) is 30-40 mm.

4. A connection node between a prefabricated rail top air duct and a middle plate according to claim 3, characterized in that: The width of the steel backing plate (31) is half of its length. The length of the steel backing plate (31) is 160-200 mm and the thickness is not less than 20 mm.

5. A connection node between a prefabricated rail top air duct and a middle plate according to claim 4, characterized in that: The diameter of the reserved hole in the main body middle plate (7) is 60-80 mm.

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