Method for connecting vertical rectangular air ducts in narrow spaces

Abstract

The application discloses a vertical rectangular air pipe connecting method in a narrow space, which comprises the following steps: step one, collecting the flange size information of the air pipe and the installation space size information around the air pipe; step two, determining the bolt installation position on the flange and the flange clamp installation position, and determining the length and width of the flange clamp; step three, inserting the bolt according to the determined position, and placing the flange clamp above the unconnected flange; and step four, installing a pressing device to press the flange and the flange clamp. The application can solve the construction problem of the vertical air pipe connection sealing in the narrow space, especially can avoid the problems of poor air pipe connection construction quality and loose air pipe in the narrow space which is difficult for people to enter, and can save the later maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of construction and the technical field of air pipe construction, and particularly relates to a vertical rectangular air pipe connecting method in a narrow space. BACKGROUND

[0002] An air pipe is a pipe system for air conveying and distribution. According to the cross-sectional shape, the air pipe can be divided into a circular air pipe, an oblate air pipe and a rectangular air pipe. The rectangular air pipe is mainly used in the application because the circular air pipe has a large height dimension and is complicated to manufacture. The sealing of the connecting part of the air pipe is the key in the application technology of the air pipe, and the sealing treatment measures such as a flange connection and a sealing glue used in the gap are adopted.

[0003] The installation space of the air pipe is sometimes narrow. For example, in the construction process of the vertical air well, the three walls of the vertical air well are often surrounded by a structure wall. Most of the air pipes in the vertical air well are pressurized air supply pipes or exhaust air pipes of the fire smoke exhaust system, and the air pipe specifications are large. The air pipes are mostly connected by flanges. The space between the air pipe and the structure wall is narrow, which leads to insufficient installation space of the air pipe connection, causes construction difficulties, and even cannot be constructed. The construction quality of the air pipe connection cannot be ensured. There is no space for connection operation on at least one side and the back side of the air pipe, which leads to poor construction quality of the air pipe connection in the vertical air well, the air pipe is not tight, and the maintenance cost is high. SUMMARY

[0004] The present application aims to overcome the defects in the prior art and provide a vertical rectangular air pipe connecting method in a narrow space, so as to solve the construction problem of the vertical air pipe connection sealing in a narrow space, especially to avoid the poor construction quality of the air pipe connection in a narrow space where people are difficult to enter, the air pipe is not tight, and the maintenance cost is saved. The purpose of the present application is achieved by the following technical scheme.

[0005] A vertical rectangular air pipe connecting method in a narrow space, wherein the flanges are arranged around the upper and lower pipe joints of the rectangular air pipe, and the method comprises the following operation steps:

[0006] Step 1: Collecting the size information of the air pipe flange and the size information of the installation space around the air pipe;

[0007] Step two: determine the bolt mounting position on the flange and the flange clamp mounting position according to the space size information around the air pipe, the flange clamp mounting position is the position where the bolt mounting is not convenient due to limited space; determine the length and width of the flange clamp according to the flange size information, the length of the flange clamp is the same as the length of the flange at the mounting position, and the width of the bottom of the flange clamp is the same as the width of the flange; the flange clamp includes left and right parts: the left part is a I-beam structure pressure base, and the right part is an inclined pressure piece; the inclined pressure piece is a combined structure of a horizontal bottom plate and a vertical vertical plate, the bottom plate is a rectangular plate integrated with the bottom of the left I-beam structure, the vertical plate is an integral structure with the waist plate in the middle of the I-beam structure, the vertical plate is flush with the right end of the bottom plate, the vertical plate is a right trapezoid or a right triangle, the left end of the vertical plate is the longer base of the right trapezoid or one of the right angles of the right triangle, the right end of the vertical plate is the shorter base of the right trapezoid or one of the vertices of the triangle, and the edge of the upper part of the vertical plate is an oblique edge, the angle formed by the oblique edge and the bottom plate is the clamp angle θ, and the clamp angle θ is 10-30°;

[0008] Step three: insert the bolt according to the position determined in step two, and place the flange clamp above the unconnected flange, adjust the flange clamp to coincide with the flange and adjust the flange clamp to coincide with the flange.

[0009] Step four: install the pressure device to tighten the flange and the flange clamp, the pressure device includes: a base, a caliper rail vertically connected above the base, a self-locking caliper sleeve set on one end of the caliper rail, a fixed torque lead screw connected with the other end of the self-locking caliper and parallel to the caliper rail, a lead screw rotating connecting piece provided on the upper end of the fixed torque lead screw, and a flange clamp gasket connected to the lower end of the fixed torque lead screw; place the base on the lower part of the flange, adjust the self-locking caliper, and adjust the flange clamp gasket to be directly above the pressure base of the flange clamp; rotate the fixed torque lead screw through the lead screw rotating connecting piece to press the pressure base to tighten the flange clamp and the flange to realize the close connection of the upper and lower air pipes.

[0010] As an improvement to pressure detection, in step one, the working pressure information of the air pipe working system is also collected: including air pipe pressure grade division and construction sealing requirements; according to the different requirements of different pipe grades, the pressure threshold value in the pipe is different according to different sealing requirements.

[0011] Further optimization, in step two, determine the pressure required for clamping the flange according to the working pressure information of the air pipe working system: determine the threshold value of the force F 合 of the inclined pressure piece in the flange clamp according to the upper limit of the absolute value of the pipe pressure threshold value, the vertical pressure F2 of the flange clamp is F 合 *sinθ°, then the threshold value of F2 is the product of the threshold value of F 合 and sinθ.

[0012] Further, the upper plane of the base of the pressure applying device is provided with a pressure sensor, the pressure sensor is connected to a controller, the controller is connected to an alarm device, the controller is provided with a signal receiving module, a comparison module and a signal sending module, the comparison module is provided with a threshold value of F2, when the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller controls the alarm device to alarm.

[0013] Further, the screw rod rotating connecting piece is a small rotating motor, and the output shaft of the small rotating motor is connected with the fixed torque screw rod; the controller is electrically connected with the switch of the small rotating motor, when the comparison result of the comparison module is that the pressure value threshold value detected by the pressure sensor is less than the threshold value of F2, the controller controls the small rotating motor to rotate and drive the fixed torque screw rod to rotate downward to automatically press the flange clamp.

[0014] As an improvement of the rotating driving mode, the screw rod rotating connecting piece is a fixed torque handle, and the fixed torque handle is sleeved above the fixed torque screw rod for manual rotation and pressure.

[0015] In an application scenario, the narrow space is a vertical air shaft, three sides are surrounded and one side is open, the flanges of the air pipe located on the open side of the vertical air shaft are fixedly connected through bolts; the flange clamps are installed on the flanges located on at least one side of the vertical air shaft, and the pressure bearing base of the flange clamp is located on the side close to the opening of the vertical air shaft, and the inclined pressure piece of the flange clamp is located on the side close to the closed side of the vertical air shaft.

[0016] As an improvement of the device, the flange clamp gasket is a diamond friction gasket.

[0017] Further, the upper plane of the pressure bearing base is an abrasive plane.

[0018] Further, the left end of the vertical plate is higher than the upper plane of the pressure bearing base.

[0019] The beneficial effects of the present application are as follows:

[0020] The present application can solve the construction operation problem of vertical rectangular air pipe connection and sealing in a narrow space, and avoid the problems of poor construction quality and loose air pipe connection in the vertical air shaft.

[0021] The method of the present application can realize tooling, convenient disassembly and assembly, reduce labor input, shorten construction period and improve work efficiency.

[0022] The method of the present application can change the traditional method into tooling construction, and is flexible and practical, which conforms to the concept of "new technology".

[0023] The method of the present application makes the on-site air pipe connection firm, stable, convenient and efficient, and significantly improves the construction quality and efficiency.

[0024] The connecting method of the present application further obtains a pipe pressure threshold value according to different air pipe pressure grades and construction sealing requirements, so as to set a clamp base pressure threshold value, which can alarm in the first time when sealing problems occur, and can quickly and conveniently maintain the air pipe sealing safety through pressurization by manual or automatic facilities, and save maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The method flowchart of the present application is shown in the figure;

[0026] Figure 2 The flange clamp structure schematic diagram is shown in the figure;

[0027] Figure 3 The pressure applying device structure schematic diagram is shown in the figure;

[0028] Figure 4 The flange clamp and pressure applying device combined state structure schematic diagram is shown in the figure;

[0029] Figure 5 The stereoscopic structure schematic diagram in Example 1 is shown in the figure;

[0030] Figure 6 The side structure schematic diagram in Example 1 is shown in the figure;

[0031] Figure 7 The pressure applying device structure schematic diagram with embedded pressure sensor in Example 2 is shown in the figure;

[0032] Figure 8 The flange clamp force analysis diagram is shown in the figure;

[0033] Figure 9 The alarm and pressurization control principle block diagram in Example 3 is shown in the figure.

[0034] Reference signs:

[0035] 1, screw rod rotating connecting piece; 2, fixed torque screw rod; 3, flange clamp gasket; 4, base; 41, pressure sensor; 5, self-locking caliper; 6, caliper rail; 7, pressure bearing base; 8, inclined pressure piece; 81, vertical plate; 82, bottom plate; 9, air pipe; 91, flange; 10, wall.

[0036] In order to more clearly illustrate the embodiments of the present application, the drawings used in the present application will be briefly introduced as follows. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be noted that the same reference numerals are used to denote the same or similar parts. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] like Figure 1 As shown, a method for connecting vertical rectangular ducts in a narrow space is described. In this embodiment, the narrow space is a vertical ventilation shaft, surrounded on three sides and open on one side. Flanges 91 are provided around the joints of the upper and lower pipes of the rectangular duct 9. The method includes the following steps:

[0040] Step 1: Collect information on the dimensions of the duct flange and the installation space around the duct.

[0041] Step 2: Determine the bolt installation positions and flange clamp installation positions on the flange based on the installation space dimensions around the duct. The flange clamp installation positions are those where space is limited and bolt installation is inconvenient. Determine the length and width of the flange clamp based on the flange dimensions. The length of the flange clamp is the same as the length of the flange at its installation position to ensure that the entire flange is clamped during use. The width of the bottom of the flange clamp is the same as the width of the flange to ensure the clamp's effectiveness and ease of construction.

[0042] In this embodiment, the flange 91 of the duct 9 on the open side of the vertical ventilation shaft is fixedly connected by bolts; the distance between the wall and the duct on both sides is different. One side is wider and can barely allow a person to pass through, while the other side is too narrow for a person to pass through. A flange clamp is installed on the flange 91 on the narrow side, and the pressure base 7 of the flange clamp is located on the side closer to the opening of the vertical ventilation shaft. The inclined pressure member 8 of the flange clamp is located on the side closer to the closed side of the vertical ventilation shaft for easy operation and adjustment; flange clamps can also be installed on the back side and the wider side, since bolts can also be installed where a person can barely pass through.

[0043] like Figure 2As shown, the flange clamp comprises two parts: the left part is the I-beam structure pressure base 7, and the right part is the inclined pressure part 8; the inclined pressure part 8 is a combined structure of a horizontal bottom plate 82 and a vertical vertical plate 81, the bottom plate 82 is a rectangular plate integrated with the bottom of the left I-beam structure, the vertical plate 83 is an integral structure with the waist plate of the middle part of the I-beam structure, the vertical plate 81 is flush with the right end of the bottom plate 82, the vertical plate 81 is a right trapezoid, the left end of the vertical plate 81 is the longer base of the right trapezoid, the right end of the vertical plate 81 is the shorter base of the right trapezoid, the edge of the upper part of the vertical plate 81 is an oblique edge, the angle formed by the oblique edge and the bottom plate 82 is the clamp angle θ, the clamp angle θ is 10-30°; the angle can be selected according to the specific use condition, generally, if the air pipe is placed in the air well, the left and right widths of the air well are about 1-3m, and the clamp angle θ is 10-30°, which can meet the use condition. The angle is larger as the width of the air well increases. The left end of the vertical plate 81 is higher than the upper plane of the pressure base 7, which is preferred.

[0044] The connection technology difficulty lies in that the force at the first end of the flange clamp is inconsistent with the force at the last end, after using the ordinary plane clamp, the force applied at the first end cannot be transmitted to the last end, thereby affecting the connection effect of the air pipe. In the present application, the force of the clamp is as follows: Figure 8

[0045] Step three: insert the bolt according to the position determined in step two, and place the flange clamp above the unconnected flange 91, adjust the flange clamp to coincide with the flange 91 and adjust it.

[0046] Step four: install the pressure device to tighten the flange 91 and the flange clamp,

[0047] As shown in the figure, Figure 3 The pressure device comprises a base 4, a caliper rail 6 connected vertically above the base 4, a self-locking caliper 5 sleeved on one end of the caliper rail 6, a fixed torque lead screw 2 connected with the other end of the self-locking caliper 5 and parallel to the caliper rail 6, a lead screw rotating connecting piece 1 arranged on the upper end of the fixed torque lead screw 2, and a flange clamp gasket 3 connected to the lower end of the fixed torque lead screw 2; in this embodiment, the lead screw rotating connecting piece 1 is a fixed torque handle, and the fixed torque handle is sleeved above the fixed torque lead screw 2 for manual rotation and pressure.

[0048] The installation process is as follows: place the base 4 below the flange 91, adjust the self-locking caliper 5, and adjust the flange clamp gasket 3 to be directly above the pressure base 7 of the flange clamp; rotate the fixed torque handle to tighten the pressure base 7 to clamp the flange clamp and the flange 91 to realize the close connection of the upper and lower air pipes 9. After combination, as shown in Figure 4 5

[0049] ​​​In this embodiment, the flange clamp gasket 3 is a DAOLER diamond friction gasket. This gasket has excellent wear resistance, high temperature resistance and high hardness, etc. The embedding of diamond particles can significantly increase the static friction coefficient, thereby enhancing the stability and reliability of the connection part.

[0050] The upper plane of the pressure bearing base 7 is a frosted plane to increase the friction between the gasket and enhance stability.

[0051] Embodiment 2

[0052] This embodiment is an improvement based on embodiment 1.

[0053] In step one, the working pressure information of the air pipe system is also collected: including air pipe pressure grade division and construction sealing requirements; different pipe sealing requirements according to different pipe grade division, different pressure threshold requirements in the pipe according to different sealing requirements.

[0054] According to the Ventilation and Air Conditioning Engineering Quality Acceptance Specification GB50243-2016, the air pipe pressure grade division and construction sealing requirements are:

[0055]

[0056] In step two, in addition to determining the bolt mounting position on the flange and the flange clamp mounting position according to the space size information around the air pipe, and determining the length and width of the flange clamp according to the flange size information, the required pressure for clamping the flange is also determined according to the working pressure information of the air pipe system, which is:

[0057] The force F of the inclined line direction of the inclined pressure piece 8 in the flange clamp is determined according to the upper limit of the absolute value of the pipe pressure threshold 合 , as shown in Figure 8 , the vertical pressure F2 of the flange clamp is F 合 *sinθ°, then the threshold value of F2 is the product of the threshold value of F 合 and sinθ.

[0058] Under the micro-pressure air pipe system: F 合 ≥125Pa≥125*10 ∧-6 kPa pressure

[0059] Under the low-pressure air pipe system: F 合 ≥500Pa≥500*10 ∧-6 kPa pressure

[0060] Under the medium-pressure air pipe system: F 合 ≥1500Pa≥1500*10 ∧-6 kPa pressure

[0061] Under the high-pressure air pipe system: F合 ≥2500 Pa ≥2500*10 ∧-6 kgf

[0062] In this embodiment, θ = 30°, then F2 = F 合 *sin30°

[0063] For different working pressure grade air pipe, during the air leakage test, the flange clamp changes the force applied by the fixed torque of the first end to the required sealing pressure, and finally achieves the sealing effect of the air pipe.

[0064] And, as Figure 7 shown, a pressure sensor is arranged on the upper plane of the base 4 of the pressing device. In this embodiment, a recess is arranged on the upper plane of the base 4, and the pressure sensor 41 is embedded in the recess. The upper plane of the base in which the pressure sensor 41 is embedded is kept flat and consistent, which can not only ensure the accuracy of the pressure but also protect the service life of the pressure sensor.

[0065] The pressure sensor is connected to a controller, the controller is connected to an alarm device, and the controller is provided with a signal receiving module, a comparison module and a signal sending module. The comparison module is provided with a threshold value of F2. When the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller controls the alarm device to alarm.

[0066] Embodiment 3

[0067] This embodiment is further improved on the basis of embodiment 2. The lead screw rotating connecting piece 1 is a small rotating motor, and the output shaft of the small rotating motor is connected with the fixed torque lead screw 2. The working principle diagram is as Figure 9 shown. The controller is electrically connected with the switch of the small rotating motor. When the comparison result of the comparison module is that the threshold value of the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller not only controls the alarm but also controls the small rotating motor to rotate to drive the fixed torque lead screw 2 to rotate downward to automatically pressurize the flange clamp.

[0068] The above embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The changes or variations which are extended from the spirit of the present application are still within the protection scope of the present application.

Claims

1. A method for connecting vertical rectangular air ducts in narrow spaces, wherein flanges (91) are provided around the upper and lower pipe joints of the rectangular air ducts (9), characterized in that: The method comprises the following steps: Step one: collect the size information of the flange and the size information of the installation space around the air pipe; Step two: determine the bolt installation position on the flange and the flange clamp installation position according to the size information of the installation space around the air pipe, the flange clamp installation position is the position where the space is limited and inconvenient for bolt installation; determine the length and width of the flange clamp according to the size information of the flange, the length of the flange clamp is the same as the length of the flange at the installation position, and the width of the bottom of the flange clamp is the same as the width of the flange; The flange clamp comprises a left part and a right part: the left part is a I-beam structure pressure bearing base (7), and the right part is an inclined pressing piece (8); the inclined pressing piece (8) is a combined structure of a horizontal bottom plate (82) and a vertical vertical plate (81), the bottom plate (82) is a rectangular plate integrated with the bottom of the left I-beam structure, the vertical plate (81) is an integral structure with the waist plate in the middle of the I-beam structure, the right end of the vertical plate (81) is flush with the bottom plate (82), the vertical plate (81) is a right trapezoid or a right triangle, the left end of the vertical plate (81) is the longer base of the right trapezoid or one of the right angles of the right triangle, the right end of the vertical plate (81) is the shorter base of the right trapezoid or one of the vertices of the triangle, and the edge of the upper part of the vertical plate (81) is an inclined edge, the angle formed by the inclined edge and the bottom plate (82) is a clamp angle θ, and the clamp angle θ is 10-30°; Step three: insert the bolt according to the position determined in step two, and place the flange clamp above the unconnected flange (91), adjust the flange clamp to coincide with the flange (91) and adjust the flange clamp to coincide with the flange (91); Step four: install the pressing device to clamp the flange (91) and the flange clamp, The pressing device comprises a base (4), a caliper rail (6) vertically connected above the base (4), a self-locking caliper (5) sleeved on one end of the caliper rail (6), a fixed torque lead screw (2) connected with the other end of the self-locking caliper (5) and parallel to the caliper rail (6), a lead screw rotating connecting piece (1) arranged on the upper end of the fixed torque lead screw (2), and a flange clamp gasket (3) connected to the lower end of the fixed torque lead screw (2); Place the base (4) on the lower part of the flange (91), adjust the self-locking caliper (5), and adjust the flange clamp gasket (3) to be directly above the pressure bearing base (7) of the flange clamp; rotate the fixed torque lead screw (2) to press the pressure bearing base (7) to clamp the flange clamp and the flange (91) to realize the close connection of the upper and lower air pipes (9).

2. The method for connecting vertical rectangular ducts in a narrow space according to claim 1, wherein: In step one, the working pressure information of the air pipe working system is also collected: including air pipe pressure grade division and construction sealing requirement; according to different pipe sealing requirements, the pressure threshold value requirements in the pipe are different.

3. The method for connecting vertical rectangular air ducts in a narrow space according to claim 2, wherein: In step two, the pressure required to clamp the flange is determined based on the wind pipe working system working pressure information: the force F of the inclined line direction of the inclined pressure piece (8) in the flange clamp is determined based on the upper limit of the absolute value of the threshold value of the pipe internal pressure 合 . The threshold value of the vertical pressure F2 of the flange clamp is F 合 * sin θ °, and the threshold value of F2 is the product of the threshold value of F 合 and sin θ.

4. The method for connecting vertical rectangular air ducts in a narrow space according to claim 3, wherein: The upper plane of the base (4) of the pressure device is provided with a pressure sensor (41), the pressure sensor (41) is connected with a controller, the controller is connected with an alarm device, the controller is provided with a signal receiving module, a comparison module and a signal sending module, the comparison module is provided with a threshold value of F2, when the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller controls the alarm device to alarm.

5. The method for connecting vertically rectangular air ducts in a narrow space according to claim 4, wherein: The screw rod rotating connecting piece (1) is a small rotating motor, and the output shaft of the small rotating motor is connected with the fixed torque screw rod (2); the controller is electrically connected with the switch of the small rotating motor, when the comparison result of the comparison module is that the pressure value threshold detected by the pressure sensor is less than the threshold value of F2, the controller controls the small rotating motor to rotate and drive the fixed torque screw rod (2) to rotate downward to automatically press the flange clamp.

6. The method for connecting vertically rectangular ducts in a narrow space according to claim 1, wherein: The screw rod rotating connecting piece (1) is a fixed torque handle, and the fixed torque handle is sleeved above the fixed torque screw rod (2) for manual rotation and pressurization.

7. The method for connecting vertically rectangular ducts in a narrow space according to claim 1, wherein: The narrow space is a vertical air shaft, which is surrounded by three sides and one open side, the flange (91) of the air pipe (9) on the open side of the vertical air shaft is connected by bolt fixing; the flange clamp is installed on the flange (91) on at least one side of the vertical air shaft, and the pressure bearing base (7) of the flange clamp is located on the side close to the opening of the vertical air shaft, and the inclined pressure piece (8) of the flange clamp is located on the side close to the closed side of the vertical air shaft.

8. The method for connecting vertically rectangular ducts in a narrow space according to claim 1, wherein: The flange clamp gasket (3) is a diamond friction gasket.

9. The method for connecting vertically rectangular ducts in a narrow space according to claim 1, wherein: The upper plane of the pressure bearing base (7) is a frosted plane.

10. The method for connecting vertically rectangular air ducts in a narrow space according to claim 1, wherein: The left end of the vertical plate (81) is higher than the upper plane of the pressure bearing base (7).

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