Connecting device and construction technology for avoiding collision between line pipe and floor truss rib

Abstract

The application belongs to the field of building, and relates to a connecting device and construction technology for avoiding collision between a line pipe and a floor truss rib, which can effectively improve the firmness of connection. The double internal thread enlarged mouth circular pipe clamp connecting embedded part is improved from a double internal thread circular pipe clamp, an external thread fastening bolt sleeved on the electrical line pipe is rotated into the sleeve of the double internal thread enlarged mouth circular pipe clamp connecting embedded part, and is fastened by using a wrench. In the process of screwing, the gap on the sleeve of the external thread fastening bolt is compressed under the action of the sleeve of the double internal thread enlarged mouth circular pipe clamp connecting embedded part with gradually reduced hole diameter, and then the effect of fixing the electrical line pipe is achieved. The electrical line pipe, the external thread fastening bolt and the double internal thread enlarged mouth circular pipe clamp connecting embedded part become a firm whole, the main body structure is simple, the design concept is ingenious, the application environment is friendly, and the market prospect is wide.

Description

Technical fields:

[0001] This invention belongs to the field of construction and relates to a novel connection structure between conduits and composite floor slab truss reinforcement. In particular, it relates to a connection device and construction process that avoids collision between conduits and floor slab truss reinforcement, which can effectively improve the strength of the connection. Background technology:

[0002] In recent years, prefabricated concrete structures have been widely used in the field of housing construction. Due to their effectiveness in improving building quality and construction efficiency, saving materials, reducing energy and emissions, saving labor and improving working conditions, shortening the construction period, and facilitating winter construction, they play a major role in my country's building industrialization.

[0003] Currently, there are many problems in the on-site construction of prefabricated concrete composite slab components. One of the more common problems is that the diameter of the electrical conduit is too large to pass through the truss reinforcement of the composite slab. Since the net distance between the top chord reinforcement of the truss reinforcement and the upper surface of the 60mm thick bottom slab of the composite floor is generally 35mm, while the outer diameter of the electrical conduit is greater than 35mm, the electrical conduit cannot pass through the truss reinforcement of the composite slab. On-site construction workers often solve the above problem by cutting the top chord reinforcement of the truss reinforcement, but this reduces the shear strength of the composite slab and poses a hidden danger to the structural safety of the building.

[0004] In view of the problem of electrical conduits colliding with truss reinforcement during the actual construction of prefabricated concrete composite slab components, this invention aims to combine the actual construction needs of prefabricated concrete composite slab components and electrical wiring layout. By utilizing the production process of prefabricated concrete base slabs, a new type of conduit joint is designed to connect to the upper chord reinforcement of the truss reinforcement. This joint is used for the subsequent connection and layout of electrical conduits, avoiding the problem of electrical conduits colliding with truss reinforcement and solving the safety hazard of reduced shear strength of the composite slab. Summary of the Invention:

[0005] The purpose of this invention is to overcome the above-mentioned defects in the existing technology. Based on the construction method and mechanical connection principle of electrical conduit connection and embedded conduit connection components, this invention designs and provides a connection device and construction process to avoid collision between conduits and floor slab truss reinforcement. The device does not require adhesives, welding, clamps or other measures, and has good firmness and high safety.

[0006] To achieve the above objectives, the technical solution of the novel connection device and construction process for avoiding collision between conduits and the truss reinforcement of composite floor slabs, as disclosed in this invention, is as follows:

[0007] The main structure of a novel connection device for avoiding collision between conduits and composite floor slab truss reinforcement, as disclosed in this invention, includes a double-threaded enlarged-mouth circular pipe clamp connection embedded part, a double-threaded enlarged-mouth circular pipe clamp flange, an external thread fastening bolt and nut, an external thread fastening bolt, an external thread fastening bolt with shoulder sleeve, truss reinforcement upper chord reinforcement, and electrical conduit.

[0008] The double-threaded enlarged-mouth circular pipe clamp connection embedded part is an improved version of the double-threaded circular pipe clamp. Two rings of double-threaded enlarged-mouth circular pipe clamp flanges are provided on the outer circle of the embedded part to facilitate the welding connection between the double-threaded enlarged-mouth circular pipe clamp flanges and the upper chord steel bars of the truss reinforcement. This also increases the contact area between the double-threaded enlarged-mouth circular pipe clamp connection embedded part and the concrete, and increases the connection reliability between the double-threaded enlarged-mouth circular pipe clamp connection embedded part and the precast base plate, preventing it from falling off due to vibration during pouring, compaction and transportation.

[0009] The main structure of the external thread fastening bolt includes an external thread fastening bolt and an external thread fastening bolt with a shoulder sleeve. The left and right ends of the double internal thread enlarged-mouth circular pipe clamp connecting the embedded part are provided with external thread fastening bolts. The external thread fastening bolt with a shoulder sleeve can be rotated into the sleeve of the double internal thread enlarged-mouth circular pipe clamp connecting the embedded part. The external thread fastening bolt with a shoulder sleeve is used to fit on the electrical conduit. The external thread fastening bolt with a shoulder sleeve has a horizontal gap in the middle.

[0010] The inner cavity of the double internal thread enlarged-mouth circular pipe clamp connection embedded part is a through hole structure and is vertically symmetrical. The middle of the through hole is a cylindrical through hole structure, and the two ends are structures with the hole diameter smoothly decreasing from the outside to the inside, until it extends to the middle cylindrical through hole structure.

[0011] The externally threaded fastening bolt, fitted onto the electrical conduit, is rotated into the sleeve of the double-threaded enlarged-mouth circular pipe clamp connecting embedded part, and tightened using a wrench. During the screwing process, the sleeve of the externally threaded fastening bolt is compressed under the action of the sleeve of the double-threaded enlarged-mouth circular pipe clamp connecting embedded part with a gradually decreasing hole diameter, thereby achieving the effect of fixing the electrical conduit. This makes the electrical conduit, externally threaded fastening bolt, and double-threaded enlarged-mouth circular pipe clamp connecting embedded part a solid whole, providing conditions for large-diameter electrical conduits to directly pass through the truss reinforcement in the later stage. The content of this invention is applicable to most similar pipe connections, and is not limited to electrical conduit connections.

[0012] Furthermore, in the present invention, the height h of the double internal thread enlarged circular pipe hoop flange is the same as the diameter of the upper chord bar of the truss reinforcement, and the flange static distance a is equal to the sum of the diameter of the upper chord bar of the truss reinforcement and twice the diameter of the web reinforcement.

[0013] The present invention relates to a novel connection device for avoiding collisions between conduits and the truss reinforcement of composite floor slabs. The specific steps for its use are as follows:

[0014] S1. Determine the maximum diameter φ and location of the electrical conduit that needs to pass through the truss reinforcement.

[0015] Based on relevant electrical and structural drawings and the prefabricated composite floor slab split plan, the diameter φ and specific location of the electrical conduits with a diameter φ > 35mm that need to pass through the truss reinforcement are determined, and detailed indications are made in the composite slab fabrication details.

[0016] S2. Determine the relevant properties of the embedded parts for electrical conduit connections.

[0017] (1) Positioning of embedded parts

[0018] Based on the location of the electrical conduit connection embedded parts in each composite floor slab precast base plate determined in step S1, determine the truss reinforcement that needs to be connected to the electrical conduit joint, and mark the specific location of the electrical conduit connection embedded parts on the upper chord reinforcement of the corresponding truss reinforcement.

[0019] (2) Embedded parts for electrical conduit connections

[0020] The embedded connection component used is an improved version of the double-threaded circular pipe clamp, featuring an enlarged double-threaded circular pipe clamp. Two flanges, with a height h equal to the diameter of the upper chord reinforcement of the truss reinforcement and a flange static distance a equal to the sum of the diameter of the upper chord reinforcement and twice the diameter of the web reinforcement, are provided on the outer circular side of this embedded component. These flanges, known as the enlarged double-threaded circular pipe clamp flanges, facilitate welding between the flanges and the upper chord reinforcement of the truss reinforcement. This also increases the contact area between the embedded component and the concrete, enhancing the reliability of the connection between the embedded component and the precast base slab and preventing detachment due to vibration during pouring, compaction, and transportation. The attribute parameters of this double-threaded enlarged circular pipe clamp embedded component are determined according to the following formula:

[0021]

[0022]

[0023]

[0024]

[0025]

[0026] In the formula: h is the height of the flange of the double internal thread enlarged circular pipe clamp; The diameter of the flange of the double internally threaded enlarged circular pipe clamp; The outer diameter of the pre-embedded part for the double internal thread enlarged circular pipe clamp connection; H min The minimum wall thickness for the embedded part of the double internal thread enlarged circular pipe clamp connection is ≥6mm; The maximum diameter of the large-diameter end of the embedded part for the double internal thread enlarged-mouth circular pipe clamp connection; The minimum inner diameter of the large diameter and the maximum diameter of the small diameter end of the embedded part for the double internal thread enlarged-mouth circular pipe clamp connection; Minimum inner diameter of the small diameter of the embedded part for double internal thread enlarged circular pipe clamp connection; H max W represents the maximum wall thickness of the double-threaded enlarged-mouth circular pipe clamp connection embedded part; W represents the length of the double-threaded enlarged-mouth circular pipe clamp connection embedded part. The diameter of the conduit to be connected to the electrical wiring.

[0027] S3. Determine the relevant attributes of the connecting components between the electrical conduit and the double-threaded enlarged-mouth circular pipe clamp embedded parts.

[0028] The present invention proposes a connection component for connecting an electrical conduit and a double-threaded, enlarged-mouth circular clamp to an embedded part. The specific structure is as follows: the material is PVC; the shouldered sleeve of the externally threaded fastening bolt is symmetrically cut with a width of D2 = 10mm; the outer diameter of the shouldered sleeve of the externally threaded fastening bolt is... The length is C = L1, and the wall thickness is 4 mm.

[0029] S4. Casting and prefabrication of composite floor slabs and precast base slabs.

[0030] The flange of the double-threaded enlarged circular pipe clamp is clamped to the upper chord of the truss reinforcement, and the two are fixedly connected by welding, so that the double-threaded enlarged circular pipe clamp connection embedded part and the upper chord of the truss reinforcement become an effective whole. The double-threaded enlarged circular pipe clamp connection embedded part is sealed with a rubber stopper with an external release agent to prevent concrete from pouring in during the pouring process. Then, the mold of the precast base plate component of the composite floor slab is assembled using the flat mold method, the concrete of the precast base plate component is poured, and after vibration and roughening, the concrete at both ends of the double-threaded enlarged circular pipe clamp connection embedded part is cleaned.

[0031] S5. Curing and demolding inspection of precast composite floor slab components.

[0032] This invention employs steam curing to cure the precast composite floor slab components after casting. The exposed portions of the upper chord reinforcement of the truss bars and the embedded parts of the double-threaded enlarged-mouth circular pipe clamps are treated with anti-rust paint for corrosion protection. After curing, the molds of the precast composite floor slab components are removed, and the surface, dimensions, and positions of the embedded parts of the precast composite floor slab components are inspected. Finally, all the precast composite floor slab components are transported to the site.

[0033] S6. Hoisting and Installation

[0034] According to the prefabricated composite floor slab split plan, the hoisting and installation scheme is determined. The prefabricated base plate component of the composite floor slab with double internal thread enlarged opening circular pipe clamp connection embedded part is hoisted to the predetermined position. When laying electrical lines, the steps are as follows: (1) Put the external thread fastening bolt on the electrical conduit; (2) Insert the electrical conduit into the sleeve of the double internal thread enlarged opening circular pipe clamp connection embedded part; (3) Rotate the external thread fastening bolt into the sleeve of the double internal thread enlarged opening circular pipe clamp connection embedded part, and tighten it with a wrench. During the screwing process, the sleeve of the external thread fastening bolt is compressed by the sleeve of the double internal thread enlarged circular pipe clamp connecting the embedded part with the gradually decreasing pipe diameter. This achieves the effect of fixing the electrical conduit, making the electrical conduit, external thread fastening bolt, and double internal thread enlarged circular pipe clamp connecting the embedded part a solid whole. Through the above steps, the electrical conduit can pass through the truss reinforcement of the composite floor slab precast base plate component using the double internal thread enlarged circular pipe clamp connecting the embedded part, avoiding the cutting off of the upper chord reinforcement of the truss reinforcement.

[0035] Compared with existing technologies, the beneficial effects of this invention are as follows: When tightening conduits, the contact surface of the externally threaded fastening bolt is frustoconical, resulting in a large contact area and uniform force distribution, thus preventing conduit damage. The double-threaded enlarged-mouth circular clamp has two additional flanges on its outer side, which not only facilitates welding but also helps in the effective connection between the double-threaded enlarged-mouth circular clamp and the concrete, making the connection between the double-threaded enlarged-mouth circular clamp, concrete, and truss reinforcement more robust. This device and method are used in subsequent electrical conduit connection and layout construction operations, avoiding the problem of electrical conduits colliding with truss reinforcement, solving the safety hazard of reduced shear strength in composite slabs, and compensating for the shortcomings of traditional conduit connection methods. In summary, its main structure is simple, its design ingenious, its application environment is friendly, and its market prospects are broad. Attached image description:

[0036] Figure 1 This is a schematic diagram illustrating the installation and usage process of a novel connection device for preventing collisions between conduits and the truss reinforcement of composite floor slabs, which is part of the invention.

[0037] Figure 2 This is a schematic diagram illustrating the positioning principle of the pre-embedded part for the double internal thread enlarged circular pipe clamp connection involved in this invention.

[0038] Figure 3 This is a schematic diagram of the main structure of the double internal thread enlarged circular pipe clamp connection embedded part involved in this invention.

[0039] Figure 4 This is a schematic diagram of the NN cross-section principle of the double internal thread enlarged circular pipe clamp connection embedded part involved in this invention.

[0040] Figure 5 This is a schematic diagram of the main structure of the external thread fastening bolt involved in this invention.

[0041] Figure 6 This is a top view schematic diagram of the external thread fastening bolt involved in this invention.

[0042] Figure 7 This is a schematic diagram illustrating the connection principle of the electrical conduit, external thread fastening bolt, and double internal thread enlarged circular pipe clamp embedded part involved in this invention.

[0043] Among them, the embedded parts are: 1. Double internal thread enlarged round pipe clamp connection; 2. Double internal thread enlarged round pipe clamp flange; 3. External thread fastening bolt and nut; 4. External thread fastening bolt; 5. External thread fastening bolt with shoulder sleeve; 6. Truss reinforcement upper chord reinforcement; 7. Electrical conduit.

[0044] The distances Dx and Dy from the edge of the plate along the x-axis and y-axis directions of the center of the double internal thread enlarged circular pipe clamp connecting embedded part; the outer radius d of the double internal thread enlarged circular pipe clamp connecting embedded part; half the length L of the double internal thread enlarged circular pipe clamp connecting embedded part; W—the length of both ends of the double internal thread enlarged circular pipe clamp. —Flange diameter; —Outer diameter of the double internal thread enlarged circular pipe clamp; H min —Minimum wall thickness of double internal thread enlarged-mouth circular pipe clamp; —Maximum diameter of the major diameter end of the internal thread; —Minimum inner diameter of the major diameter of the internal thread and maximum end diameter of the minor diameter of the internal thread; —Minimum inner diameter of the minor diameter of the internal thread; L1—Effective thread length of the double internal thread enlarged round pipe clamp; L2—Complete thread length of the double internal thread enlarged round pipe clamp; h—Flange height; a—Flange static distance; D1—Diameter of the external thread fastening bolt with shoulder sleeve; D2—Gap spacing of the external thread fastening bolt with shoulder sleeve. Detailed implementation method:

[0045] To clearly illustrate the technical features of this solution, the present invention will be further described below with reference to embodiments.

[0046] Example 1:

[0047] The main structure of the novel connection device for avoiding collision between conduits and composite floor slab truss reinforcement involved in this embodiment includes a double internal thread enlarged circular pipe clamp connection embedded part 1, a double internal thread enlarged circular pipe clamp flange 2, an external thread fastening bolt and nut 3, an external thread fastening bolt 4, an external thread fastening bolt with shoulder sleeve 5, truss reinforcement upper chord reinforcement 6, and electrical conduit 7.

[0048] The double-threaded enlarged-mouth circular pipe clamp connection embedded part 1 is an improved version of the double-threaded circular pipe clamp. Two double-threaded enlarged-mouth circular pipe clamp flanges 2 are provided on the outer side of the circular part to facilitate the welding connection between the double-threaded enlarged-mouth circular pipe clamp flanges 2 and the upper chord steel bar 6 of the truss reinforcement. This increases the contact area between the double-threaded enlarged-mouth circular pipe clamp connection embedded part 1 and the concrete, and increases the connection reliability between the double-threaded enlarged-mouth circular pipe clamp connection embedded part 1 and the precast base plate, preventing it from falling off due to vibration during pouring, compaction and transportation.

[0049] The main structure of the external thread fastening bolt 4 includes the external thread fastening bolt 4 and the external thread fastening bolt with shoulder sleeve 5. The left and right ends of the double internal thread enlarged round pipe clamp connecting embedded part 1 are provided with external thread fastening bolts 4. The external thread fastening bolt with shoulder sleeve 5 can be rotated into the sleeve of the double internal thread enlarged round pipe clamp connecting embedded part 1. The external thread fastening bolt with shoulder sleeve 5 is used to fit on the electrical conduit 7. The external thread fastening bolt with shoulder sleeve 5 has a horizontal gap in the middle.

[0050] The inner cavity of the double internal thread enlarged circular pipe clamp connecting embedded part 1 is a through hole structure and is vertically symmetrical. The middle of the through hole is a cylindrical through hole structure, and the two ends are structures with the hole diameter smoothly decreasing from the outside to the inside, until it extends to the middle cylindrical through hole structure.

[0051] The external threaded fastening bolt 4, which is fitted onto the electrical conduit 7, is rotated into the sleeve of the double internal thread enlarged-mouth circular pipe clamp connection embedded part 1, and tightened with a wrench. During the screwing process, the sleeve of the external threaded fastening bolt 4 is compressed under the action of the sleeve of the double internal thread enlarged-mouth circular pipe clamp connection embedded part 1, which gradually reduces the diameter of the hole. This achieves the effect of fixing the electrical conduit 7, making the electrical conduit 7, the external threaded fastening bolt 4, and the double internal thread enlarged-mouth circular pipe clamp connection embedded part 1 a solid whole. This provides conditions for the large-diameter electrical conduit 7 to directly pass through the truss reinforcement in the later stage. This embodiment is suitable for most similar pipe connections and is not limited to electrical conduit 7 connections.

[0052] Furthermore, in this embodiment, the height h of the double internal thread enlarged circular pipe clamp flange 2 is the same as the diameter of the upper chord steel bar 6 of the truss reinforcement, and the flange static distance a is equal to the sum of the diameter of the upper chord steel bar 6 of the truss reinforcement and twice the diameter of the web reinforcement.

[0053] The novel connection device for avoiding collision between conduits and the truss reinforcement of composite floor slabs involved in this embodiment is used in the following manner:

[0054] S1. Determine the maximum diameter φ and location of the electrical conduit 7 that needs to pass through the truss reinforcement.

[0055] Based on relevant electrical and structural drawings and the prefabricated composite floor slab split plan, the diameter φ and specific location of the electrical conduits with a diameter φ > 35mm that need to pass through the truss reinforcement are determined, and detailed indications are made in the composite slab fabrication details.

[0056] S2. Determine the relevant properties of the embedded parts for the electrical conduit 7 connection.

[0057] (1) Positioning of embedded parts

[0058] Based on the positions of the electrical conduit 7 connection embedded parts in each precast base slab of the composite floor slab determined in step S1, such as Figure 2 As shown, determine the truss reinforcement that needs to be connected to the electrical conduit 7 connector, and mark the specific location of the electrical conduit 7 connection embedded part on the upper chord reinforcement 6 of the corresponding truss reinforcement.

[0059] (2) Embedded parts for connecting electrical conduit 7

[0060] The embedded connection component used is a modified version of a double-threaded enlarged-mouth circular pipe clamp, called a double-threaded enlarged-mouth circular pipe clamp connection embedded component 1. Two flanges with a height h equal to the diameter of the upper chord reinforcement 6 of the truss reinforcement and a flange static distance a equal to the sum of the diameter of the upper chord reinforcement 6 and twice the diameter of the web reinforcement are set on the outer circle of this embedded component; these are the double-threaded enlarged-mouth circular pipe clamp flanges 2. This facilitates welding between the double-threaded enlarged-mouth circular pipe clamp flanges 2 and the upper chord reinforcement 6 of the truss reinforcement, and increases the contact area between the double-threaded enlarged-mouth circular pipe clamp connection embedded component 1 and the concrete, thereby increasing the connection reliability between the double-threaded enlarged-mouth circular pipe clamp connection embedded component 1 and the precast base slab, and preventing detachment due to vibration during pouring, compaction, and transportation. Figure 4 As shown, the attribute parameters of the double internal thread enlarged circular pipe clamp connection embedded part 1 are determined according to the following formula:

[0061]

[0062]

[0063]

[0064]

[0065]

[0066] In the formula: h is the height of the flange 2 of the double internal thread enlarged circular pipe clamp; The diameter of the double internal thread enlarged circular pipe clamp flange 2; The outer diameter of the pre-embedded part 1 for the double internal thread enlarged circular pipe clamp connection; H minThe minimum wall thickness of the embedded part 1 for the double internal thread enlarged circular pipe clamp connection is ≥6mm; The maximum diameter of the large-diameter end of the double-threaded enlarged-mouth circular pipe clamp connection embedded part; Double internal thread enlarged-mouth circular pipe clamp connection embedded part 1: minimum inner diameter of the large diameter and maximum diameter of the small diameter end; Double internal thread enlarged-mouth circular pipe clamp connection embedded part 1, minimum inner diameter of the smaller diameter; H max W represents the maximum wall thickness of the double-threaded enlarged-mouth circular pipe clamp connection embedded part 1; W represents the length of the double-threaded enlarged-mouth circular pipe clamp connection embedded part 1. The diameter of the conduit to be connected to the electrical wiring.

[0067] S3. Determine the relevant properties of the connecting components between the electrical conduit 7 and the double-threaded enlarged circular pipe clamp embedded part 1.

[0068] In this embodiment, the specific structure of the connecting component between the electrical conduit 7 and the double-threaded enlarged-mouth circular clamp connecting the embedded part 1 is as follows: Figure 5 As shown, the material is PVC. The shouldered sleeve of the external threaded fastening bolt 4 is symmetrically cut with a width of D2 = 10mm. The outer diameter of the shouldered sleeve of the external threaded fastening bolt 4 is... The length is C = L1, and the wall thickness is 4 mm.

[0069] S4. Casting and prefabrication of composite floor slabs and precast base slabs.

[0070] The flange 2 of the double internal thread enlarged circular pipe clamp is clamped to the upper chord steel bar 6 of the truss reinforcement. The two are fixedly connected by welding, so that the double internal thread enlarged circular pipe clamp connection embedded part 1 and the upper chord steel bar 6 of the truss reinforcement become an effective whole. The double internal thread enlarged circular pipe clamp connection embedded part 1 is sealed with a rubber stopper with an external release agent to prevent concrete from pouring in during the pouring. Then, the mold of the precast base plate component of the composite floor slab is assembled using the flat mold method. The concrete of the precast base plate component is poured. After vibration and roughening, the concrete at both ends of the double internal thread enlarged circular pipe clamp connection embedded part 1 is cleaned.

[0071] S5. Curing and demolding inspection of precast composite floor slab components.

[0072] In this embodiment, steam curing is used to cure the precast composite floor slab components after casting. The exposed part of the upper chord steel bar 6 of the truss reinforcement and the embedded part 1 of the double internal thread enlarged circular pipe hoop are treated with anti-rust paint for corrosion prevention. After curing, the mold of the precast composite floor slab components is removed, and the surface, size and position of the embedded parts of the precast composite floor slab components are inspected. Then all the precast composite floor slab components are transported to the site.

[0073] S6. Hoisting and Installation

[0074] Based on the prefabricated composite floor slab layout plan, determine the hoisting and installation scheme. Hoist the prefabricated base slab component of the composite floor slab, equipped with embedded double-threaded enlarged-mouth circular pipe clamps (1), to the predetermined position. When laying electrical wiring, the specific connection method is as follows: Figure 7 As shown, the steps are as follows: (1) Put the external thread fastening bolt 4 on the electrical conduit 7; (2) Insert the electrical conduit 7 into the sleeve of the double internal thread enlarged round pipe clamp connecting embedded part 1; (3) Rotate the external thread fastening bolt 4 into the sleeve of the double internal thread enlarged round pipe clamp connecting embedded part 1 and tighten it with a wrench. During the screwing process, the sleeve of the external thread fastening bolt 4 is compressed under the action of the sleeve of the double internal thread enlarged round pipe clamp connecting embedded part 1 with the pipe diameter gradually decreasing, thereby achieving the effect of fixing the electrical conduit 7, so that the electrical conduit 7, the external thread fastening bolt 4, and the double internal thread enlarged round pipe clamp connecting embedded part 1 become a solid whole. Through the above steps, the electrical conduit can pass through the truss reinforcement of the composite floor slab precast base plate component by using the double internal thread enlarged round pipe clamp connecting embedded part 1, avoiding the cutting of the upper chord reinforcement 6 of the truss reinforcement.

Claims

1. A connection device to prevent conduit from colliding with floor slab truss reinforcement, characterized in that... Its main structure includes a double internal thread enlarged circular pipe clamp connection embedded part, a double internal thread enlarged circular pipe clamp flange, an external thread fastening bolt and nut, an external thread fastening bolt, an external thread fastening bolt with shoulder sleeve, truss steel reinforcement upper chord steel reinforcement, and electrical conduit. The double-threaded enlarged-mouth circular pipe clamp connection embedded part is a double-threaded circular pipe clamp, and two rings of double-threaded enlarged-mouth circular pipe clamp flanges are provided on the outer circle of the embedded part to facilitate the welding connection between the double-threaded enlarged-mouth circular pipe clamp flanges and the upper chord steel bars of the truss reinforcement. This also increases the contact area between the double-threaded enlarged-mouth circular pipe clamp connection embedded part and the concrete, and increases the connection reliability between the double-threaded enlarged-mouth circular pipe clamp connection embedded part and the precast base plate, preventing it from falling off due to vibration during pouring, vibration and transportation. The main structure of the external thread fastening bolt includes an external thread fastening bolt and an external thread fastening bolt with a shoulder sleeve. The left and right ends of the double internal thread enlarged-mouth circular pipe clamp connecting the embedded part are provided with external thread fastening bolts. The external thread fastening bolt with a shoulder sleeve can be rotated into the sleeve of the double internal thread enlarged-mouth circular pipe clamp connecting the embedded part. The external thread fastening bolt with a shoulder sleeve is used to fit on the electrical conduit. The external thread fastening bolt with a shoulder sleeve has a horizontal gap in the middle. The external threaded fastening bolt on the electrical conduit is rotated into the sleeve of the double internal thread enlarged orifice circular pipe clamp connecting embedded part, and tightened with a wrench. During the screwing process, the sleeve of the external threaded fastening bolt is compressed by the action of the sleeve of the double internal thread enlarged orifice circular pipe clamp connecting embedded part with the gradually decreasing hole diameter, thereby achieving the effect of fixing the electrical conduit. The construction process of the connection device for preventing collisions between conduits and floor slab truss reinforcement, and the specific usage steps of the connection device for preventing collisions between conduits and composite floor slab truss reinforcement, are as follows: S1. Determine the maximum diameter φ and location of the electrical conduit that needs to pass through the truss reinforcement. Determine the diameter φ and specific location of the conduit with an electrical diameter φ > 35mm that needs to pass through the truss reinforcement; S2. Determine the relevant properties of the embedded parts for electrical conduit connections. (1) Positioning of embedded parts Based on the location of the electrical conduit connection embedded parts in each composite floor slab precast base plate determined in step S1, determine the truss reinforcement that needs to be connected to the electrical conduit joint, and mark the specific location of the electrical conduit connection embedded parts on the upper chord reinforcement of the corresponding truss reinforcement. (2) Embedded parts for electrical conduit connections The embedded connection component used is an improved version of the double-threaded circular pipe clamp, featuring an enlarged double-threaded circular pipe clamp. Two flanges, with a height h equal to the diameter of the upper chord reinforcement of the truss reinforcement and a flange static distance a equal to the sum of the diameter of the upper chord reinforcement and twice the diameter of the web reinforcement, are provided on the outer circular side of this embedded component. These flanges, known as the enlarged double-threaded circular pipe clamp flanges, facilitate welding between the flanges and the upper chord reinforcement of the truss reinforcement. This also increases the contact area between the embedded component and the concrete, enhancing the reliability of the connection between the embedded component and the precast base slab and preventing detachment due to vibration during pouring, compaction, and transportation. The attribute parameters of this double-threaded enlarged circular pipe clamp embedded component are determined according to the following formula: In the formula: h is the height of the flange of the double internal thread enlarged circular pipe clamp; φ1 is the diameter of the flange of the double internal thread enlarged circular pipe clamp; φ2 is the outer diameter of the embedded part of the double internal thread enlarged circular pipe clamp connection; H min The minimum wall thickness of the double-threaded enlarged-mouth circular pipe clamp connection embedded part is ≥6mm; the maximum diameter of the large-diameter end of the φ3 double-threaded enlarged-mouth circular pipe clamp connection embedded part; the minimum inner diameter of the large-diameter side and the maximum diameter of the small-diameter end of the φ4 double-threaded enlarged-mouth circular pipe clamp connection embedded part; the minimum inner diameter of the small-diameter side of the φ5 double-threaded enlarged-mouth circular pipe clamp connection embedded part; H max W is the maximum wall thickness of the double-threaded enlarged-mouth circular pipe clamp connection embedded part; φ is the length of the double-threaded enlarged-mouth circular pipe clamp connection embedded part; and φ is the diameter of the conduit to be connected to the electrical wiring. S3. Determine the relevant attributes of the connecting components between the electrical conduit and the double-threaded enlarged-mouth circular pipe clamp embedded parts. The specific structure of the connecting component between the electrical conduit and the double internal thread enlarged circular pipe clamp connecting the embedded parts is as follows: the material is PVC, the shoulder sleeve of the external thread fastening bolt is symmetrically cut with a gap of width D2 = 10mm, the outer diameter of the shoulder sleeve of the external thread fastening bolt is D1 = φ5, the length is C = L1, and the wall thickness is 4mm. S4. Casting and prefabrication of composite floor slabs and precast base slabs. The flange of the double-threaded enlarged circular pipe clamp is clamped to the upper chord of the truss reinforcement, and the two are fixedly connected by welding, so that the double-threaded enlarged circular pipe clamp connection embedded part and the upper chord of the truss reinforcement become an effective whole. The double-threaded enlarged circular pipe clamp connection embedded part is sealed with a rubber stopper with an external release agent to prevent concrete from pouring in during the pouring process. Then, the mold of the precast base plate component of the composite floor slab is assembled using the flat mold method, the concrete of the precast base plate component is poured, and after vibration and roughening, the concrete at both ends of the double-threaded enlarged circular pipe clamp connection embedded part is cleaned. S5. Curing and demolding inspection of precast composite floor slab components. Steam curing was used to cure the precast composite floor slab components after casting. The exposed parts of the upper chord reinforcement of the truss reinforcement and the embedded parts of the double internal thread enlarged circular pipe clamp connection were treated with anti-rust paint for corrosion protection. After curing, the mold of the precast composite floor slab components was removed, and the surface, size and position of the embedded parts of the precast composite floor slab components were inspected. Then all the precast composite floor slab components were transported to the site. S6. Hoisting and Installation When the precast composite floor slab component with double internal thread enlarged opening circular pipe clamp connection embedded part is hoisted to the predetermined position for electrical wiring, the steps are as follows: (1) put the external thread fastening bolt on the electrical conduit; (2) insert the electrical conduit into the sleeve of the double internal thread enlarged opening circular pipe clamp connection embedded part; (3) rotate the external thread fastening bolt into the sleeve of the double internal thread enlarged opening circular pipe clamp connection embedded part and tighten it with a wrench. During the screwing process, the sleeve of the external thread fastening bolt is compressed under the action of the sleeve of the double internal thread enlarged opening circular pipe clamp connection embedded part with the gradually decreasing pipe diameter, thereby achieving the effect of fixing the electrical conduit, making the electrical conduit, external thread fastening bolt and double internal thread enlarged opening circular pipe clamp connection embedded part into a solid whole. Through the above steps, the electrical conduit can pass through the truss reinforcement of the precast composite floor slab component using the double internal thread enlarged opening circular pipe clamp connection embedded part, avoiding the cutting of the upper chord reinforcement of the truss reinforcement.

2. The connection device for avoiding collision between conduit and floor slab truss reinforcement according to claim 1, characterized in that... The inner cavity of the double internal thread enlarged-mouth circular pipe clamp connection embedded part is a through hole structure and is vertically symmetrical. The middle of the through hole is a cylindrical through hole structure, and the two ends are structures with the hole diameter smoothly decreasing from the outside to the inside, until it extends to the middle cylindrical through hole structure.

3. The connection device for avoiding collision between conduit and floor slab truss reinforcement according to claim 1, characterized in that... The height h of the double internal thread enlarged circular pipe hoop flange is the same as the diameter of the upper chord bar of the truss reinforcement, and the flange static distance a is equal to the sum of the diameter of the upper chord bar of the truss reinforcement and twice the diameter of the web reinforcement.

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