CN115528608A

CN115528608A - Construction process for improving sleeve embedding precision in laying process of electrical pipeline

Info

Publication number: CN115528608A
Application number: CN202211325549.9A
Authority: CN
Inventors: 刘鹏岗; 朱晓东; 刘元; 吴迪; 李朋; 曹健
Original assignee: Beijing Urban Construction North Equipment Installation Co ltd
Current assignee: Beijing Urban Construction North Equipment Installation Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2022-12-27

Abstract

The invention provides a construction process for improving the embedding precision of a sleeve in the laying process of an electrical pipeline, which comprises the following steps: step S100: preparation before construction: inspecting the pipe, the sleeve and the accessory products to ensure that the construction requirements are met; step S200: the installation of the interior secret tubular product that applies of underground three-layer civil air defense specifically includes: prefabricating and processing the pipe and the sleeve; measuring the position of the box and reserving the position of the box; carrying out hidden coating treatment on the pipe; the pipes are connected by a sleeve; cutting off the pipe; sleeving the galvanized pipe with wire; bending the pipe, fixing the pipe and then performing ground-crossing wiring treatment on the pipe; step S300: pre-burying and installing the non-civil air defense area pipe; step S400: pre-burying and installing pipes of an emergency lighting system and a fire fighting system; step S500: and (5) pre-burying and installing the house service pipes. According to the invention, the problem of high failure rate of sleeve installation in the laying process of the electric pipeline is solved, the purpose of remarkably improving the average qualified rate of sleeve installation is realized, the construction quality is effectively improved, the project progress is accelerated, and the construction cost is reduced.

Description

Construction process for improving embedded precision of sleeve in laying process of electrical pipeline

Technical Field

The invention belongs to the technical field of pipeline construction, and particularly relates to a construction process for improving the sleeve embedding precision in the laying process of an electrical pipeline.

Background

A large amount of reserved embedded projects exist in the building construction process, and the construction time for reserving the embedded projects in the building construction process is very limited. Generally, the reserved pre-buried includes: line and line pipe positioning, rigid sleeve and water stop joint pre-embedding, drain pipe, fresh air pipe and bridge opening reserving, mounting water pipe pre-embedding rigid groove and other 10 procedures. The most complicated and critical process is to pre-embed the casing.

The sleeve pipe plays an important role in the pre-buried installation of water pipe and electric wire: 1. the drawing and pulling for subsequent wire replacement are convenient; 2. the water pipe and the electric wire are protected to prevent from being damaged; 3. the wiring design of regular water pipes or electric wires avoids the phenomenon that the water pipes or the electric wires are randomly staggered. However, in the actual construction process, the probability that the quality problem occurs in the installation of the casing pipe is high, and the factors influencing the construction quality of the pre-buried installation of the indoor casing pipe are quantified according to relevant documents and specification regulations such as 'inspection and acceptance of construction water supply and drainage and heating engineering quality' GB50242-2002 ',' inspection and acceptance of construction quality of construction electrical engineering 'GB 50303-2015', 'mandatory provisions of engineering construction standard-house building part' 2013 edition, and the following are respectively concluded: the deviation of the sleeve installation position and a drawing, the deviation of the sleeve length, the installation firmness, the distance between the sleeve and a concrete maintenance layer, the welding quality of a waterproof wing ring of the sleeve, the diameter of the sleeve and the like. According to the factors influencing the installation quality of the sleeve and the investigation data of similar projects, the quality problem of a certain construction project is investigated by using the principle of a random sampling method. The results of the investigation are shown in table 1:

TABLE 1

The average of the quality problems arising from the installation of the casing was 14.3%, i.e. the first pass yield was 85.7%. The main reasons are the deviation of the sleeve installation position from the drawing and the deviation of the sleeve length, which account for 72 percent of the problems. Therefore, in order to ensure the construction quality of the installation of the sleeve, a construction process for improving the pre-embedding precision of the sleeve in the laying process of the electrical pipeline needs to be provided urgently to solve the above main problems.

Disclosure of Invention

In order to guarantee the construction quality of the installation of the sleeve, the invention provides a construction process for improving the embedding precision of the sleeve in the laying process of an electric pipeline.

A construction process for improving the pre-burying precision of a sleeve in the laying process of an electrical pipeline,

the embedding work of inserting the sleeve in due time in the laying process of the electric pipeline; the method comprises the following specific steps:

step S100: preparation before construction: inspecting the pipe, the sleeve and the accessory products to ensure that the construction requirements are met;

step S200: pre-burying and installing underground three-layer civil air defense pipes: the hidden-coating pipe in the underground three-layer civil air defense in the laying process of the electric pipeline adopts a galvanized steel pipe, and the hidden-coating process of the galvanized steel pipe specifically comprises the following steps: prefabricating and processing the pipe and the sleeve, wherein the processing size deviation of the sleeve is less than or equal to 2mm; measuring the position of the box and reserving the position of the box; performing hidden coating treatment on the pipe, wherein the pipe is required to be horizontal and vertical during hidden coating; connecting the pipes by adopting a sleeve connection mode; cutting off the pipe; threading the galvanized pipe manually or by using a threading machine; if the pipes needing to be bent are subjected to pipe bending treatment, fixing the pipes in the reinforced concrete wall and the floor slab, and then performing ground-crossing wiring treatment on the pipes;

step S300: pre-burying and installing the non-civil air defense area pipe: the non-people's air defense area of electric piping installation in-process uses the JDG pipe, and the JDG pipe carries out the dark process of applying and specifically includes: prefabricating a JDG pipe to be used as required, then reserving the box position and performing hidden laying on the pipe in the same way, wherein the pipe is directly laid along the nearest route during hidden laying, and bending, pipe cutting, box fixing and pipe connection are reduced;

step S400: pre-burying and installing the emergency lighting system and the fire fighting system pipes: emergency lighting system, the buried tubular product of fire extinguishing system among the electric pipeline laying process adopt SC welding steel pipe, and SC welding steel pipe carries out the laying process and specifically includes: measuring and positioning, prefabricating an SC welded steel pipe to be used, prefabricating a box and a bracket which are matched with the SC welded steel pipe, and connecting pipes by adopting a sleeve;

step S500: pre-burying and installing the house service pipes: the house service pipe in the laying process of the electric pipeline adopts a welded steel pipe, and when the house service pipe is installed, the outward end has a slope of 1.5 percent, and the inside is high and the outside is low; the pipes are connected with each other by a sleeve, the pipes are connected with the box by welding, and all house service steel pipes are welded by 40 multiplied by 4 galvanized flat steel in a grounding way.

According to a specific implementation manner of the embodiment of the application, when the pipe is inspected in the step S100, the pipe is required to have uniform wall thickness, uniform and intact plating layer, no peeling, no corrosion, uniform welding line, no splitting, burr, sand hole, edge and flat defects.

According to a specific implementation manner of the embodiment of the application, when the pipe is prefabricated in each step and is buried underground or in concrete, the bending radius of the concealed pipe is not less than 10 times of the outer diameter of the pipe.

According to a specific implementation manner of the embodiment of the application, in the step S300, when the pipe is connected with a straight pipe, two pipe orifices are respectively inserted into the middle of a straight pipe joint and tightly attached to two ends of the groove, and after the pipe is positioned by a set screw, the pipe is screwed until a nut falls off;

when in bending connection, the pipe orifices at the two ends of the bending pipe are respectively inserted into the grooves of the sleeve joint, and are screwed until the screw cap falls off after being positioned by a set screw.

According to a concrete implementation mode of this application embodiment, in step S300, when the fire door region is prevented in the non-people' S air defense area and JDG pipe laying is carried out, when tubular product has following circumstances, add the terminal box in the middle:

when the pipe does not turn, the length of the pipe is not more than 30m; or

When the pipe has a turn, the length of the turn is not more than 20m; or

When the pipe has two turns, the turning length is not more than 15m; or

When the pipe has three turns, the turning length is not more than 8m.

According to a concrete implementation mode of the embodiment of the application, during the prefabrication processing operation of the SC welded steel pipe to be used, when the pipe is stewed, a hand-operated bending machine or a hydraulic bending machine is adopted for bending, the bending radius of the steel pipe is not less than 10D of the outer diameter of the pipe, and the bending flatness is not more than 0.1D.

According to a specific implementation mode of the embodiment of the application, the distance between the embedding depth of the hidden conduit and the surface of a building is not less than 15mm, and the distance between the embedded depth of the hidden conduit and the surface of the building is not less than 30mm;

the conduits which are applied on the surface should be arranged orderly, the fixed point intervals are uniform, the installation is firm, and the pipe clamps are arranged in the range of 150-500mm of the distance between the middle point of the terminal and the elbow or the edges of the cabinet, the box, the plate and the like.

According to a specific implementation manner of the embodiment of the application, when the laying manner of the pipe is open laying, the maximum distance between the pipe clamps of the middle straight-line section of the conduit should meet the following requirements:

the conduit is a rigid steel conduit with the wall thickness more than 2mm, the diameter of the conduit is 15-20mm, and the distance between the pipe clamps is less than or equal to 1.5m;

the conduit is a rigid steel conduit with the wall thickness more than 2mm, the diameter of the conduit is 25-32mm, and the distance between the pipe clamps is less than or equal to 2.0m;

the conduit is a rigid steel conduit with the wall thickness larger than 2mm, the diameter of the conduit is 32-40mm, and the distance between the pipe clamps is smaller than or equal to 2.5m;

the conduit is a rigid steel conduit with the wall thickness more than 2mm, the diameter of the conduit is 50-65mm, and the distance between the pipe clamps is less than or equal to 2.5m;

the conduit is a rigid steel conduit with the wall thickness more than 2mm, the diameter of the conduit is more than 65mm, and the distance between the pipe clamps is less than or equal to 3.5m;

the conduit is a rigid steel conduit with the wall thickness less than or equal to 2mm, the diameter of the conduit is 15-20mm, and the distance between the pipe clamps is less than or equal to 1.0m;

the conduit is a rigid steel conduit with the wall thickness less than or equal to 2mm, the diameter of the conduit is 25-32mm, and the distance between the pipe clamps is less than or equal to 1.5m;

the conduit is a rigid steel conduit with the wall thickness less than or equal to 2mm, the diameter of the conduit is 32-40mm, and the distance between the pipe clamps is less than or equal to 2.0m;

when the conduit is a rigid insulating conduit, the diameter of the conduit is 15-20mm, and the distance between the pipe clamps is less than or equal to 1.0m;

when the conduit is a rigid insulating conduit, the diameter of the conduit is 25-32mm, and the distance between the pipe clamps is less than or equal to 1.5m;

when the conduit is a rigid insulating conduit, the diameter of the conduit is 32-40mm, and the distance between the pipe clamps is less than or equal to 1.5m;

when the conduit is a rigid insulating conduit, the diameter of the conduit is 50-65mm, and the distance between the pipe clamps is less than or equal to 2.0m;

when the conduit is a rigid insulating conduit, the diameter of the conduit is more than 65mm, and the distance between the pipe clamps is less than or equal to 2.0m.

According to a specific implementation mode of the embodiment of the application, when the insulated conduit is buried in the groove-removing groove of the masonry, cement mortar with the strength grade not less than M10 is used for plastering protection, and the thickness of the protection layer is larger than 15mm.

According to a specific implementation mode of the embodiment of the application, when the house-entering pipe is in the middle of a wall, a water-stopping steel plate needs to be installed, and the intersection of the pipe and the steel plate is subjected to girth welding.

According to the construction process for improving the sleeve embedding precision in the electrical pipeline laying process, the problem of high sleeve installation fault rate in the electrical pipeline laying process is solved, the purpose of remarkably improving the average qualified rate of sleeve installation is achieved, the construction quality is effectively improved, the project progress is accelerated, and the construction cost is reduced. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 shows a flow chart of a construction process for improving the embedding precision of a sleeve in the laying process of an electrical pipeline according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a construction process for improving the embedding precision of a sleeve in the laying process of an electrical pipeline, wherein the embedding work of the sleeve is inserted in the laying process of the electrical pipeline in due time, and the operation is strictly carried out according to an implementation drawing when the embedding work of the sleeve is implemented; the method comprises the following specific steps: step S100: preparation before construction: inspecting the pipe, the sleeve and the accessory products to ensure that the construction requirements are met; step S200: pre-burying and installing underground three-layer civil air defense pipes: the concealed laying pipe in the underground three-layer civil air defense in the laying process of the electric pipeline adopts a galvanized steel pipe, and the concealed laying process of the galvanized steel pipe specifically comprises the following steps: prefabricating and processing the pipe and the sleeve, wherein the processing size deviation of the sleeve is less than or equal to 2mm; measuring the position of the box and reserving the position of the box; performing hidden coating treatment on the pipe, wherein the pipe is required to be horizontal and vertical during hidden coating; connecting the pipes by adopting a sleeve connection mode; cutting off the pipe; sleeving the galvanized pipe by hand or by using a wire sleeving machine; if the pipes needing to be bent are subjected to pipe bending treatment, fixing the pipes in the reinforced concrete wall and the floor slab, and then performing cross-ground wiring treatment on the pipes; step S300: pre-burying and installing the non-civil air defense area pipe: the non-people's air defense area of electric piping installation in-process uses the JDG pipe, and the JDG pipe carries out the dark process that applies specifically includes: prefabricating a JDG pipe to be used as required, then reserving the box position and performing hidden laying on the pipe in the same way, wherein the pipe is directly laid along the nearest route during hidden laying, and bending, pipe cutting, box fixing and pipe connection are reduced; step S400: the pre-buried installation of emergency lighting system, fire extinguishing system tubular product: the emergency lighting system, the fire extinguishing system of electric pipeline laying process secretly bury the tubular product and adopt SC welded steel pipe, and SC welded steel pipe lays the process and specifically includes: measuring and positioning, prefabricating and processing an SC welded steel pipe to be used, prefabricating and processing a box and a bracket matched with the SC welded steel pipe, and connecting pipes by adopting a sleeve; step S500: pre-burying and installing the house service pipes: the house service pipe in the laying process of the electric pipeline adopts a welded steel pipe, and when the house service pipe is installed, the outward end has a slope of 1.5 percent, and the inside is high and the outside is low; the pipes are connected by sleeves, the pipes are connected with the box by welding, and all house service steel pipes are welded by 40 multiplied by 4 galvanized flat steel.

The construction procedure of the embedded sleeve in the whole electrical pipeline laying process is divided regionally, different regions adopt corresponding types of pipes, corresponding embedded operation is set, the problem possibly generated in each region is solved correspondingly, potential safety hazards caused by the deviation between the installation position of the sleeve and a drawing and the deviation of the length of the sleeve are effectively solved, and the construction quality of the embedded sleeve in the building engineering is further guaranteed.

Next, a construction process for improving the pre-burying precision of the sleeve in the laying process of the electrical pipeline is explained in detail.

Step S100: preparation before construction: and (4) checking the pipe, the sleeve and the accessory products to ensure that the construction requirements are met, and preparing the metering and measuring instruments required in the construction in advance according to the construction scheme.

Specifically, before construction, whether the positions and the sizes of the electrical shafts, holes and the like reserved in the civil engineering are correct or not is carefully checked according to a drawing. According to construction drawings and acceptance specifications, the electric pipeline laying process is timely insertedAnd (4) embedding, wherein all piping projects are constructed according to the design drawing strictly based on the design drawing. The material, design direction and connection position of the pipe cannot be changed at will. If the position is required to be changed, the construction is carried out after the relevant change procedures are handled. When the pipe appearance is checked, the pipe is required to have uniform wall thickness, uniform and intact plating layer, no peeling, no corrosion, uniform welding line, no splitting, burr and sand hole, no edge and flat, and the like; the locking nut has the advantages of complete appearance, clear screw threads, no warping deformation and the like. The ground wire is bridged by a special pipeline galvanized grounding clip, the clip is matched with the specification and the model of the pipeline, and the ground wire adopts BVR-4m ² And (4) carrying out tinning treatment on a compression joint of a plurality of strands of copper core wires. Other materials and equipment required by the engineering can be constructed after the specification, the model and the quality quantity of the equipment are qualified through supervision and confirmation. Various construction equipment must meet technical standards.

Step S200: pre-burying and installing underground three-layer civil air defense pipes: the method comprises the following steps: prefabricating and processing the pipe; measuring the position of the box and reserving the position of the box; hidden coating of the pipe; connecting the pipes; cutting off the pipe; sleeving the galvanized pipe with wire; bending the pipe; and (4) fixing the pipe and performing cross-ground wiring treatment.

Specifically, the hidden coating pipe in the underground three-layer civil air defense of electric pipeline laying process adopts galvanized steel pipe, and the galvanized steel pipe carries out the hidden coating process and specifically includes: prefabricating and processing the pipe; measuring the position of the box and reserving the position of the box; performing hidden coating treatment on the pipe, wherein the pipe is required to be horizontal and vertical during hidden coating, the horizontal or vertical installation deviation of the pipe is less than or equal to 1.5 per thousand, and the full-length deviation is less than or equal to 1/2 of the inner diameter of the pipe; when the pipes are connected, the pipes are connected by adopting a sleeve connection mode, and the length of the sleeve is 2.0-3.5 times of the outer diameter of the pipe; cutting off the pipe; the galvanized pipe mantle fiber and the pipe which needs to be bent are bent manually or by using a mantle fiber machine, then the pipe in the reinforced concrete wall and the floor slab is bound on the reinforcing steel bars at intervals of 800-1000mm by using lead wires to fix the pipe, and then the grounding special clamp and the BVR-4mm are used ² The insulating soft copper wire performs cross-ground wiring processing on the pipe.

Furthermore, the process of performing the dark coating on the galvanized steel pipe specifically comprises the following steps:

step S201, performing prefabrication processing on the pipe to check whether the pipe is smooth, whether burrs exist inside the pipe, whether the antirust paint is complete and undamaged, and straightening the pipe if the pipe is not smooth; during pipe bending prefabrication processing: when the concealed pipe is buried underground or in concrete, the bending radius of the concealed pipe is not less than 10 times of the outer diameter of the pipe.

Step S202, determining the position of a box, reserving the position of the box, and firstly determining the accurate positions of the box, the box and an outlet according to a construction drawing; in order to ensure the installation quality of the box, unify the installation height and reduce the installation deviation, the construction is carried out according to the following method, and a wood sleeve box must be reserved for concealed packing, and the method comprises the following specific steps: a wood jacketed box with the size larger than that of a box body is reserved at the position of the distribution box according to the requirements of design drawings, and the wood jacketed box can be generally required to be 50-100 mm larger on the left and 150-200 mm larger on the upper and lower.

And S203, performing hidden laying on the pipe, wherein the pipe is required to be horizontally and vertically arranged, the horizontal or vertical installation deviation is less than or equal to 1.5 per thousand, the full-length deviation is less than or equal to 1/2 of the inner diameter of the pipe, the metal pipe box is required to be connected with a protective ground wire, the pipe in the wall body is required to be laid in two layers of reinforcing steel bar nets along the nearest path and is bound and fixed along the inner sides of the reinforcing steel bars, and the binding distance is not required to be more than 1.5m. When the conduit passes through the column, the conduit should be reinforced appropriately to reduce the influence of the concealed conduit on the structure.

And S204, connecting the pipes, wherein the pipes are connected in a sleeve connection mode, and the length of the sleeve is 2.0-3.5 times of the outer diameter of the pipe.

Furthermore, when the pipe is connected with the pipe, the length of the sleeve is 2.0-3.5 times of the outer diameter of the pipe, in the embodiment of the invention, the length of the sleeve is 3.0 times of the outer diameter of the pipe, the buckling part of the connecting pipe is positioned at the center of the sleeve, when the galvanized steel pipes are connected, the galvanized steel pipes are connected by screw threads, and two ends of the connecting part are fixedly connected with a cross-over ground wire by using a special grounding card. The pipe hoop is connected by screw threads, the threading phenomenon cannot occur, the pipe hoop must use a harness wire pipe hoop, and the length of the pipe hoop is preferably 2.2 times of the outer diameter of the pipe. When a pipe is connected with a box, the position of the box is firstly determined, a short pipe with proper length is cut according to the position, a screw thread is sleeved on one end of the short pipe in advance, the length of the screw thread is about 15mm, the other end of the short pipe is connected with an original pipeline according to a connecting method of the pipeline and the pipeline, the steel pipes entering the box are orderly arranged if a plurality of the steel pipes exist, the distance between the two pipes is greater than twice of the width of the edge of a used lock nut, the installation of the lock nut is ensured, and the lock nut is arranged after the pipeline is connected so as to be used when a distribution box or a junction box is installed.

And S205, cutting off the pipe, wherein a small batch of steel pipes are generally cut off by a steel saw, the pipe to be cut off is placed in a jaw of a bench vice to be clamped firmly, the distance between the cut-off position and the jaw is proper, the cut-off position cannot be too long or too short, and the operation is accurate. When the pipe is to be sawed, the saw blade is perpendicular to the pipe, the force is slightly applied when the pipe is pushed, but the force cannot be too strong, so that the saw blade is not broken, when the pipe is sawn back, the saw blade is lifted by a pin, the abrasion of the saw blade is reduced as much as possible, and when the pipe is to be broken soon, the speed is reduced, so that the pipe is sawed off stably. The cutting opening is level and not inclined, and can not be in a horseshoe shape, the inner wall of the pipe opening is smooth in scraping and filing, and no edge or thorn exists, and scrap iron in the pipe is removed.

Step S206, the galvanized pipe is sheathed with wires manually or by using a wire sheathing machine, and if the galvanized pipe needs to be bent, the pipe is bent.

When the manual threading plate is used, uniform force is applied, and when the pipe diameter is larger than 32mm, the threading is finished by three times so as to ensure that the thread is complete and clear; the screw thread is not messy or overlong, slag chips are eliminated, and the screw thread is clean and clear; when the threading machine is used, a corresponding threading die is selected according to the outer diameter of a pipe, and threading is generally carried out by adopting a threading plate: during threading, the pipe is fixed on a bench vice or a gantry pressing frame and is clamped tightly; selecting a corresponding threading die according to the outer diameter of the tube, slightly sleeving the twisting plate at the tube end, adjusting three supporting feet of the twisting plate to enable the twisting plate to be tightly attached to the tube, so that inclined threads cannot appear during threading, holding the twisting plate by a hand after the twisting plate is adjusted, stably pushing the twisting plate inwards, carrying 2-3 buckles on the twisting plate, standing to the side, rotating the threading plate clockwise, slowing down the threading plate at the beginning, paying attention to uniform force during threading to avoid the phenomena of thread deviation and thread gnawing, slightly loosening the trigger when the thread is about to be sleeved, and starting up the threading plate.

And S207, bending the pipe to be bent, specifically machining a bent pipe according to a construction drawing, wherein the bent pipe can be formed by a cold bending method. Generally, when the pipe diameter is 25mm or less, a pipe bending machine can be pulled by hand, namely, the pipe is inserted into the pipe bending machine, and the pipe is gradually bent to form the required bending degree; when the pipe diameter is 32mm or more, a hydraulic pipe bender can be used. When processing the pipe buried underground or in the concrete, the bending radius of the hidden pipe is not less than 10 times of the outer diameter of the pipe.

S208, fixing the pipes and bridging the ground wires, binding the pipes in the reinforced concrete wall and the floor slab on the reinforcing steel bars at intervals of 800-1000mm by using lead wires for fixing the pipes, and then utilizing the special grounding clamp and the BVR-4mm ² The insulating soft copper wire performs cross-ground wiring processing on the pipe.

Step S300: pre-burying and installing the non-civil air defense area pipe: the method specifically comprises the following steps: the pipe to be used is prefabricated according to requirements, the box and the support matched with the pipe are prefabricated until the construction requirements are met, then the box position is reserved, the pipe is concealed and laid, the pipe is laid along the nearest route in the concealed laying process and is required to be bent, the clear distance between a guide pipe in concrete and the surface of the concrete is not smaller than 15mm, the pipe is cut off, and then the box and the pipe are fixed to be connected.

Specifically, the non-civil air defense area in the electrical pipeline laying process uses JDG pipes, the process of the pre-buried installation of the JDG pipes is basically the same as that in step S200, and it is worth noting that the JDG pipes should pay attention to the following key nodes in the construction process: when reserving the box position, the survey of box position: determining the axial line positions of the box and the box according to a construction drawing, taking a horizontal line popped up by civil engineering as a reference, hanging the line for leveling, aligning the line weight, and marking the actual positions of the box and the box. The through lines or cross lines are hung at the positions of the boxes and boxes in rows and columns.

The buried pipeline runs straight along the nearest route and should reduce bending, and the clear distance between the conduit in the concrete and the surface of the concrete should not be less than 15mm.

When the pipe is cut off, a steel saw, a toothless saw or an abrasive wheel saw is used for cutting the pipe, the length of the pipe to be cut is accurate, the pipe is placed in a jaw and clamped firmly, the cut is level and not inclined, the pipe opening is scraped and milled smoothly and has no burrs, and scrap iron in the pipe is removed.

When the box or box is stably poured, firstly installing a clamping iron or a car rod on the box or box on the concrete floor, and spot-welding the clamping iron or the car rod on the steel bars; when the box is a wooden template, the box and the box can be bound and fixed on the template by nails and thin lead wires.

When the pipes are connected: the length of the connecting sleeve is 2.0-3.5 times of the outer diameter of the pipe, the radian of a central concave groove of the connecting sleeve is uniform, the position is vertical and correct, and the depth of the concave groove is consistent with the thickness of the pipe wall of the steel guide pipe. When the pipe straight pipe is connected, the two pipe orifices are respectively inserted into the middle of the straight pipe joint and tightly attached to the two ends of the groove, and the pipe is screwed until the screw cap falls off after being positioned by the set screw. When in bending connection, the pipe orifices at the two ends of the bending pipe are respectively inserted into the grooves of the sleeve joint, and are screwed until the screw cap falls off after being positioned by a set screw. When the JDG pipe is laid, the pipe is additionally provided with a junction box in the middle when the pipe has the following conditions: when the pipe does not turn, the length of the pipe is not more than 30m; or when the pipe has a turn, the length of the turn is not more than 20m; or when the pipe has two turns, the length of the turn does not exceed 15m; or when the pipe has three turns, the length of the turn does not exceed 8m.

The tubular product is connected with box, case: when the sleeved and fastened steel conduit pipe enters the floor type box (cabinet), the arrangement is neat, and the pipe orifice is 50-80 mm higher than the base surface of the distribution box (cabinet). The duct orifices of the rows of distribution boxes (cabinets) are of uniform height. The sleeve joint tightly fixed steel conduit pipe enters the box (case), should be straight, and should be fixed by special joint.

When the pipe is fixed: the pipelines in the reinforced concrete wall and the floor slab are bound on the reinforcing steel bars by lead wires every 1000mm or so.

Step S400: pre-burying and installing the emergency lighting system and the fire fighting system pipes: the method specifically comprises the following steps: measuring and positioning, prefabricating the pipe to be used, prefabricating a box and a bracket matched with the pipe, and connecting the pipe by using a sleeve; the thickness of the protective layer in the wall or the concrete is not less than 15mm.

The emergency lighting system and the fire-fighting system buried pipes in the laying process of the electric pipelines adopt SC welded steel pipes.

Specifically, the process of embedding and installing the SC welded steel pipe is basically the same as that in step S200, and it should be noted that the following key nodes should be noted in the construction process of the SC welded steel pipe:

prefabricating and processing the pipe:

pipe roasting: the manual bending machine and the hydraulic bending machine are adopted for bending. The bending radius of the steel pipe is not less than 10D of the outer diameter of the steel pipe; the bending flatness is less than or equal to 0.1D.

Pipe breaking: the steel pipe fracture is level and not askew, the pipe orifice is scraped and milled smoothly and burrs are removed, and scrap iron in the pipe is removed.

Presetting and processing: in order to facilitate the site construction and reduce the construction time of the homework book, a part of accessories are firstly arranged on the site.

When the box is fixed:

firstly, measuring the positions of a box and a box: determining the axial positions of the box and the box according to the requirements of a design drawing, and marking the actual size positions of the box and the box by taking a horizontal line popped up by civil engineering as a reference.

A box and a box are stabilized: the stable injection box and the stable injection box require full slurry, smoothness, firmness and correct position. The box and case mounting requirements are shown in table 2. The fixed box of system concrete siding wall, case add a indisputable fixed, when the box, the bottom of the case apart from the outer wall face is less than 3cm, need add the fixed back of metal mesh and plaster again, prevent the sky and split.

Actual measurement item	Require that	Tolerance deviation (mm)
			Horizontal and vertical position of box or case	Correction of	10 (brick wall) 30 (big template)
Adjacent elevation in 1m of box	Uniformity	2
			Box fixing	Is perpendicular to	2
Case fixation	Is perpendicular to	3
			Box, box opening and wall surface	Flush and level	Maximum recess depth 10mm

TABLE 2

When the SC welding steel pipeline is connected, (1) the outward end of the service pipe has a 1.5% gradient, and the inward end needs to consider the position of the service cabinet; arranging steel pipes entering and leaving the cabinet orderly; the protective layer in the wall and the concrete is not less than 15mm. (2) Adopting a sleeve for connection: the length of the sleeve is preferably 2.2 times the outer diameter of the tube, and the corresponding opening of the tube is positioned in the center of the sleeve. When the sleeve is welded and connected, the welding is firm and tight. (3) The pipe is connected with box (case) and adopts welded connection, and the pipe is connected with the box: a pipe is inserted into the knock-out (or connection) hole which is matched with the pipe one by one, the extending length is preferably 3-5 mm, the pipe is welded at the contact part of the outer wall of the box and the welded cumulative length is not less than 1/3 of the outer circumference of the pipe, and the box wall is not burnt through. The pipe is connected with the tank: should not weld pipe and box together, use as the round steel of cross-over connection earth connection and do horizontal welding to the income case pipe on suitable position, make the box put the back, the mouth of pipe can be higher than the length of incasement wall for 3 ~ 5mm can, will keep length unanimous, mouth of pipe parallel and level when many pipes go into the case. And after the box body is installed, welding round steel for connecting the steel pipe with the edge on the outer side of the box body.

When the SC is welded with the steel pipe grounding jumper wire, grounding is carried out according to the requirements of the table 3;

caliber (mm)	Round steel (mm)	Flat steel (mm)
			≤25	φ6	-
32	φ8	-
			40～50	φ10	25×3
70～80	φ12	25×4

TABLE 3

When the SC welding steel pipe passes through the telescopic settlement joint, the two sides of the deformation joint are respectively pre-embedded with a junction box, one end of the pipe is fixed on the junction box, the bottom of the junction box at the other side is provided with a long hole in the vertical direction, and the length and the width of the hole diameter of the long hole are not less than 2 times of the diameter of the connected pipe.

SC welded steel pipe ground connection: using RVV-4mm ² And the integral grounding connection is carried out, and compensation treatment is required when the integral grounding connection penetrates through a deformation joint of a building.

It is worth noting that the quality problems to be noted during construction are as follows:

(1) when the hand-operated pipe roasting machine is used, the movement is moderate, and the force is not too strong.

(2) When the oil pressure pipe bending machine or the pipe bending machine is used, the die needs to be matched, and the welding seam of the pipe needs to be on the front side and the back side.

(3) The hidden pipeline is bent too much, and when the pipeline is laid, the hidden pipeline is laid along the nearest route according to the requirements of design drawings and the field situation, and the bent part which does not go round can be obviously reduced.

(4) When the box and the case are picked and filled, the case is filled with mortar, and the opening of the box and the case is collected in time and then threaded with a device.

(5) When the wire tube is welded with a cross-over ground wire, the tube is welded, the welding is not firm, the welding is missed, the welding surface is not multiple enough, the responsibility of an operator is not strong, or the technical level is too low, the responsibility and technical education of the operator are enhanced, and the welding is carried out strictly according to the standard requirement.

(6) The hidden pipe is blocked, and the pipe is cleaned in time after the pipe is arranged, so that the blocked pipe is repaired in time. The pipe plug is added in time after the pipe is arranged to plug the pipe orifice tightly.

(7) The pipe orifice is not flat and has burrs, the opening is not milled in time after the pipe is broken, a file is applied to level the pipe orifice, the burrs are removed, and the pipe is arranged.

Step S500: pre-burying and installing the house service pipes: when the house service pipe is installed, the outward end has a slope of 1.5 percent, and the inside is high and the outside is low; the pipes are connected with each other by a sleeve, the pipes are connected with the box by welding, and all house service steel pipes are welded by 40 multiplied by 4 galvanized flat steel in a grounding way.

The house-entering pipe in the laying process of the electric pipeline adopts a welded steel pipe.

Specifically, the process of pre-embedding and installing the service pipes is basically the same as that in the step S200, and it should be noted that the welded steel pipes of the service pipes should be noted the following key nodes in the construction process:

the metal conduit is strictly forbidden to be subjected to butt fusion welding connection, and the galvanized steel conduit with the wall thickness less than or equal to 2mm cannot be subjected to sleeve fusion welding connection;

when the insulating guide pipe is embedded in the masonry after the groove is removed, cement mortar with the strength grade not less than M10 is adopted for surface protection, and the thickness of a protective layer is more than 15mm;

the distance between the embedding depth of the conduit in the concealed arrangement and the surface of a building is not less than 15mm, the distance between the embedding depth of the conduit in the concealed arrangement and the surface of the building is not less than 30mm, the conduit in the exposed arrangement is orderly arranged, the fixed point distance is uniform, the installation is firm, pipe clamps are arranged in the range of 150-500mm from the middle point of a terminal or an elbow or the edges of a cabinet, a box, a plate and the like, and the maximum distance between the pipe clamps in the middle straight line section is in accordance with the specification of a table 4:

TABLE 4

The insulated conduit should comply with the following regulations when laid:

the pipe orifice is smooth and flat; when the pipe and box are connected by inserting method, the joint surface of the joint is coated with special adhesive, and the joint is sealed firmly.

The rigid insulating conduit directly buried in the ground or the floor slab penetrates out of the ground or the section of the floor slab which is easily damaged by machinery, and protective measures are taken.

When no design requirement exists, the insulating guide pipe embedded in the wall or the concrete adopts a guide pipe with a size larger than the medium size.

In the whole construction process, the wall bushing is fixed, and after the bushing is checked to be placed, a welding lifting rib is additionally arranged on the bushing. And fixing the horizontal position and the elevation. And welding the lifting rib on the secondary rib of the beam. After the position and the elevation of the sleeve are checked to be correct, two sides of the sleeve are respectively welded with a reinforcing steel bar which is directly propped against the bottom of the beam. And fixing the floor-passing sleeve, marking the sleeve according to a drawing for positioning after the template is installed, uniformly nailing 4 iron nails according to the outer size of the sleeve, checking the sleeve to be placed, binding iron wires on the iron nails after confirming that the position of the sleeve is correct, and binding and fixing the installed floor-passing sleeve. Before concrete is poured into the civil engineering, a three-level acceptance program is carried out, self-inspection is carried out by teams and groups, re-inspection is carried out by a worker leader, special inspection is carried out by a quality security worker, after the position, elevation and size of the sleeve are rechecked to be correct, supervision inspection is carried out, hidden acceptance inspection of the embedded sleeve is carried out, and concrete pouring can be carried out only after the position, elevation and size of the embedded sleeve are qualified.

The implementation results of the construction process of the embedded casing in the building engineering in the patent of the invention are comprehensively checked and statistically summarized, and the results are shown in table 5:

TABLE 5

It can be seen from table 5 that the installation quality of the embedded casing is effectively controlled, after self-checking, comprehensive inspection and statistics summary are performed, 185 points are checked in total for the casing, 177 points are qualified, the average pass rate reaches 95.7%, the problem that the casing installation failure rate is high in the laying process of the electrical pipeline is overcome, the purpose of remarkably improving the average pass rate of the casing installation is achieved, the construction quality is effectively improved, the engineering progress is accelerated, and the construction cost is reduced.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A construction process for improving the embedded precision of a sleeve in the laying process of an electrical pipeline is characterized in that:

inserting the embedded sleeve in time in the laying process of the electric pipeline; the method comprises the following specific steps:

step S200: pre-burying and installing underground three-layer civil air defense pipes: the hidden-coating pipe in the underground three-layer civil air defense in the laying process of the electric pipeline adopts a galvanized steel pipe, and the hidden-coating process of the galvanized steel pipe specifically comprises the following steps: prefabricating and processing the pipe and the sleeve, wherein the processing size deviation of the sleeve is less than or equal to 2mm; measuring the position of the box and reserving the position of the box; performing hidden coating treatment on the pipe, wherein the pipe is required to be horizontal and vertical during hidden coating; connecting the pipes by adopting a sleeve connection mode; cutting off the pipe; sleeving the galvanized pipe by hand or by using a wire sleeving machine; if the pipes needing to be bent are subjected to pipe bending treatment, fixing the pipes in the reinforced concrete wall and the floor slab, and then performing cross-ground wiring treatment on the pipes;

step S300: pre-burying and mounting the non-civil air defense area pipe: the non-people's air defense area of electric piping installation in-process uses the JDG pipe, and the JDG pipe carries out the dark process that applies specifically includes: prefabricating a JDG pipe to be used as required, then reserving the box position and performing hidden laying on the pipe in the same way, wherein the pipe is directly laid along the nearest route during hidden laying, and bending, pipe cutting, box fixing and pipe connection are reduced;

step S400: the pre-buried installation of emergency lighting system, fire extinguishing system tubular product: emergency lighting system, the buried tubular product of fire extinguishing system among the electric pipeline laying process adopt SC welding steel pipe, and SC welding steel pipe carries out the laying process and specifically includes: measuring and positioning, prefabricating and processing an SC welded steel pipe to be used, prefabricating and processing a box and a bracket matched with the SC welded steel pipe, and connecting pipes by adopting a sleeve;

step S500: pre-burying and installing the house service pipes: the house service pipe in the laying process of the electric pipeline adopts a welded steel pipe, and when the house service pipe is installed, the outward end has a slope of 1.5 percent, and the inside is high and the outside is low; the pipes are connected by sleeves, the pipes are connected with the box by welding, and all house service steel pipes are welded by 40 multiplied by 4 galvanized flat steel.

2. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein: when the pipe is inspected in the step S100, the pipe is required to have uniform wall thickness, uniform and intact plating layer, no peeling, no corrosion, uniform welding line, and no defects of splitting, burr and sand hole, edge thorn and concave flat.

3. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein:

when the pipe is prefabricated in each step and is buried underground or in concrete, the bending radius of the concealed pipe is not less than 10 times of the outer diameter of the pipe.

4. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein:

in the step S300, when the pipe and the straight pipe are connected, two pipe orifices are respectively inserted into the middle of a straight pipe joint and are tightly attached to two ends of the groove, and the pipe and the straight pipe are screwed until the screw caps fall off after being positioned by a set screw;

5. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 4, wherein: in step S300, when the JDG pipe is laid in the fire door area of the non-civil air defense area, the junction box is additionally arranged in the middle of the pipe under the following conditions:

when the pipe does not turn, the length of the pipe is not more than 30m; or

When the pipe has a turn, the length of the turn is not more than 20m; or

When the pipe has two turns, the turning length is not more than 15m; or

When the pipe has three turns, the turning length is not more than 8m.

6. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein:

during prefabricating and processing operation of an SC welded steel pipe to be used, when the pipe is roasted, a hand bending machine or a hydraulic bending machine is adopted for bending, the bending radius of the steel pipe is not less than 10D of the outer diameter of the pipe, and the bending flatness is not more than 0.1D.

7. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein:

the distance between the embedded depth of the hidden conduit and the surface of a building is not less than 15mm, and the distance between the embedded depth of the hidden conduit and the surface of the building is not less than 30mm;

8. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 7, wherein: when the laying mode of the pipe is exposed laying, the maximum distance between the pipe clamps in the middle straight-line section of the guide pipe meets the following requirements:

the conduit is a rigid steel conduit with the wall thickness more than 2mm, the diameter of the conduit is 32-40mm, and the distance between the pipe clamps is less than or equal to 2.5m;

9. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline according to claim 8, wherein the construction process comprises the following steps:

when the insulating guide pipe is embedded in the masonry after groove removal, cement mortar with the strength grade not less than M10 is adopted for plastering protection, and the thickness of the protective layer is more than 15mm.

10. The construction process for improving the embedded precision of the sleeve in the laying process of the electrical pipeline as claimed in claim 1, wherein:

when the house-entering pipe is in the middle of the wall, a water-stopping steel plate needs to be installed, and the intersection of the pipe and the steel plate is subjected to girth welding.