Refined arrangement method for pipelines in cast-in-place layer of composite floor slab and composite floor slab

Abstract

The invention relates to the technical field of building structure design, and particularly discloses a method for finely arranging pipelines in a cast-in-place layer of a composite floor slab and the composite floor slab. The arrangement method comprises the steps of setting parameters, classifying pipeline positions, comparing the pipeline diameter with the size of the most unfavorable net space in the cast-in-place layer, and determining the intersection position and route of equipment pipelines. According to the composite floor slab, the pipelines in the cast-in-place layer are finely arranged through the arrangement method. The positions, the number of layers and the intervals of the steel bars in the cast-in-place layer are comprehensively considered, the most unfavorable net spaces are compared in detail, the positions of the pipelines are reasonably designed, the pipelines are arranged in a concentrated area, the engineering quality is guaranteed, the building function is met, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure design, and in particular to a method for fine arrangement of pipelines in the cast-in-place layer of a composite floor slab and a composite floor slab. Background Art

[0002] At present, prefabricated buildings are widely used in rail transit, industrial and civil buildings. In rail transit-related structures, prefabricated structural forms are often adopted, and there is also a cast-in-place concrete part. In industrial and civil buildings, in order to meet the assembly rate, floor slabs composed of precast floor slabs and a cast-in-place layer are widely used. To achieve the requirements of building functions, various equipment pipelines need to be embedded in the cast-in-place layer. There are problems such as the cast-in-place layer being relatively thin, the cast-in-place layer having many layers of steel bars, and a large number of truss steel bars and pipelines in the precast slab and being concentrated. Especially in the case of pipeline overlap at different plane intersection positions, the large number of layers of cast-in-place layer steel bars makes it difficult to arrange the pipelines. Especially at the intersection positions of different pipeline planes, the problem of pipeline overlap is more prominent, which not only affects the durability and structural safety of the floor slab, but also affects the pipeline arrangement and the realization of functions. And on the premise that the building elevation of the floor slab (affecting the indoor net height) cannot be adjusted, the thickness of the geothermal layer and related building surface layers will be compressed, affecting the realization of building functions.

[0003] In the existing design, the comprehensive influence of pipeline routing, the thickness of the cast-in-place layer, and the steel bar distribution in the floor slab on the pipeline arrangement is not considered. The pipeline arrangement is not targeted, but rather has a certain randomness. For large-diameter pipelines or cases of pipeline overlap and intersection, there is no fine design and arrangement. The top elevation of the pipeline exceeds the thickness range of the cast-in-place layer, causing cracks in the floor pipes and structural floor slabs. For the case where the cast-in-place layer has many layers of steel bar distribution and considering the influence of the steel bar truss in the precast slab, there is no fine design and arrangement, making it difficult to arrange the pipelines and resulting in missing pipes. The key reason for the above phenomena is the lack of fine design before the pipeline arrangement. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for fine arrangement of pipelines in the cast-in-place layer of a composite floor slab and a composite floor slab to solve the problem that the pipeline arrangement in the prefabricated composite floor slab in the prior art is not finely designed.

[0005] To solve the above technical problems, the present invention provides a method for fine arrangement of pipelines in the cast-in-place layer of a composite floor slab, which is characterized by including the following steps: S1. Parameter setting; h1 is the sum of the diameters of the X-direction and Y-direction reinforcing bars of the upper epithelial reinforcement, h1a is the larger value of the diameters of the X-direction and Y-direction reinforcing bars of the upper epithelial reinforcement, h2 is the sum of the diameters of the X-direction and Y-direction reinforcing bars of the middle reinforcement, h2a is the larger value of the diameters of the X-direction and Y-direction reinforcing bars of the middle reinforcement, h3 is the diameter of the upper chord reinforcement of the truss, h3a is the distance between the upper layer of the upper chord reinforcement of the truss and the upper layer of the precast floor slab, h4 is the diameter of the pipeline in the X direction, h5 is the diameter of the pipeline in the Y direction, c is the thickness of the protective layer, and H is the thickness of the cast-in-place layer; S2. Pipeline position classification; Position A is the middle area of the steel bar mesh formed by the X-direction and Y-direction reinforcing bars of the upper epithelial reinforcement in the cast-in-place layer, position B is on the X-direction or Y-direction reinforcing bar of the upper epithelial reinforcement in the cast-in-place layer, and position C is at the intersection of the X-direction and Y-direction reinforcing bars of the upper epithelial reinforcement in the cast-in-place layer; S3. Calculate the most unfavorable net space size after deducting the influence of steel bars in the cast-in-place layer at different positions of the equipment pipeline; The most unfavorable net space size above the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position A is: hjA = H - c - h3a; The most unfavorable net space size above the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position B is: hjB = H - c - h1a - h3a; The most unfavorable net space size above the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position C is: hjC = H - c - h1 - h3a; The most unfavorable net space size below the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position A is: hjA1 = h3a - h3; The most unfavorable net space size below the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position B is: hjB1 = h3a - h3 - h2a; The most unfavorable net space size below the upper chord reinforcement of the truss after deducting the influence of steel bars in the cast-in-place layer when the pipeline is at position C is: hjC1 = h3a - h3 - h2; In the case where the middle reinforcement (2) is not provided in the structural design, h2 = 0 and h2a = 0; S4. Compare the diameters of the pipelines in the X direction and the Y direction or the superimposed diameters of the pipelines in the X direction and the Y direction with the most unfavorable net space size in the cast-in-place layer to determine the intersection position and routing of the equipment pipelines; If hjC > h4, the pipeline in the X direction passes through at position C and above the upper chord reinforcement of the truss; If hjB > h4, the pipeline in the X direction passes through at position B and above the upper chord reinforcement of the truss; If hjA > h4, the pipeline in the X direction passes through at position A and above the upper chord reinforcement of the truss; If hjC1 > h5, the pipeline in the Y direction passes through at position C and below the upper chord steel bars of the truss; If hjB1 > h5, the pipeline in the Y direction passes through at position B and below the upper chord steel bars of the truss; If hjA1 > h5, the pipeline in the Y direction passes through at position A and below the upper chord steel bars of the truss; If hjC1 > h5 and hjC1 + hjC > h4 + h5, the intersection point of the pipeline in the X direction and the pipeline in the Y direction is set at position C; If hjB1 > h5 and hjB1 + hjB > h4 + h5, the intersection point of the pipeline in the X direction and the pipeline in the Y direction is set at position B; If hjA1 > h5 and hjA1 + hjA > h4 + h5, the intersection point of the pipeline in the X direction and the pipeline in the Y direction is set at position A; The fixed logic of the above relationships is: hjA > hjB > hjC, hjA1 > hjB1 > hjC1, hjA + hjA1 > hjB + hjB1 > hjC + hjC1, hjA > hjA1, hjB > hjB1, hjC > hjC1.

[0006] Preferably, it further includes step S5: S5. Obtain the refined design conclusion of the pipeline layout; For the single - layer equipment pipelines, select the pipeline with the smaller diameter in the X - direction pipeline or the Y - direction pipeline to pass through the net space below the upper chord steel bars of the truss, and select the pipeline with the larger diameter in the X - direction pipeline or the Y - direction pipeline to pass through the net space above the upper chord steel bars of the truss. The preferred position for the equipment pipeline to pass through is position A, followed by position B, and then position C; For the double - layer equipment pipelines, the intersection point of the X - direction pipeline and the Y - direction pipeline determines the appropriate position for the pipeline to pass through according to step S4. The preferred position of the intersection point is position A, followed by position B, and then position C.

[0007] The present invention also provides a composite floor slab, which is characterized in that it includes a precast floor slab, a cast - in - place layer and a protective layer stacked together from bottom to top. The cast - in - place layer is embedded with upper - layer steel bars, upper - chord steel bars of the truss and equipment pipelines. The upper - layer steel bars are reticular and located in the upper part of the cast - in - place layer. The upper - chord steel bars of the truss and the equipment pipelines are below the upper - layer steel bars. The equipment pipelines include X - direction pipelines and Y - direction pipelines, and are characterized in that the X - direction pipelines and the Y - direction pipelines are arranged according to the method for refined layout of pipelines in the cast - in - place layer of any one of the above - mentioned composite floor slabs.

[0008] Preferably, intermediate steel bars are also embedded in the cast - in - place layer. The intermediate steel bars are reticular and located in the lower part of the cast - in - place layer. The upper - chord steel bars of the truss and the equipment pipelines are between the upper - layer steel bars and the intermediate steel bars.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention comprehensively considers the number of steel bars, the spacing of steel bars, and the position of the upper chord steel bars of the truss in the cast-in-place layer, and details the analysis of the thickness of the cast-in-place layer, the distribution of the steel bars in the cast-in-place layer, the truss steel bars in the precast slab, and the situation where there are many pipelines and they are concentratedly distributed. The basic control principle of the refined design of the pipeline layout is determined: compare the diameters of the pipelines in the X direction and the Y direction, or the superimposed diameters with the size of the net space in the cast-in-place layer after deducting the pipelines, so as to determine the intersection positions and routing of the pipelines during the implementation stage, making up for the defect in the existing design that there is no refined design for the layout of the equipment pipelines in the precast and cast-in-place composite floor slab, rationalizing the pipeline positions, arranging the pipelines in the concentrated area, and enabling the pipelines to pass smoothly through the net space after deducting the influence of the steel bars, so as to solve the practical problems such as the top elevation of the pipelines exceeding the thickness of the cast-in-place layer, the leakage of pipelines caused by the dense arrangement of pipelines, the cracking of the structural floor slab, and the difficulty in arranging the pipelines due to the large number of distribution layers of the steel bars in the cast-in-place layer, ensuring the durability and structural safety of the floor slab, realizing the pipeline layout and functions, and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the plan layout diagram of the steel bar mesh in the cast-in-place layer of the composite floor slab of the embodiment of the present invention; Figure 2 It is the sectional view of the composite floor slab with intermediate steel bars of the embodiment of the present invention; Figure 3 It is the sectional view of the composite floor slab without intermediate steel bars of the embodiment of the present invention.

[0011] In the figure, 1, upper epithelial steel bar; 2, intermediate steel bar; 3, upper chord steel bar of the truss; 4, pipeline in the X direction; 5, pipeline in the Y direction; 6, cast-in-place layer; 7, precast floor slab; 8, position A; 9, position B; 10, position C; 11, protective layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following further describes in detail the embodiments of the present invention in conjunction with the drawings. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0013] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0014] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] As Figures 1-3 shown, a method for fine layout of pipelines in the cast-in-place layer of a laminated floor slab in this embodiment includes the following steps: S1. Parameter setting; h1 is the thickness of the upper-layer steel bar 1, that is, the sum of the diameters of the X-direction and Y-direction steel bars of the upper layer, h1a is the larger value of the diameters of the X-direction and Y-direction steel bars of the upper-layer steel bar 1, h2 is the thickness of the middle steel bar 2, that is, the sum of the diameters of the X-direction and Y-direction steel bars of the middle layer, h2a is the larger value of the diameters of the X-direction and Y-direction steel bars of the middle steel bar 2. In this embodiment, the upper-layer steel bar 1 refers to the steel bar located in the upper part of the cast-in-place layer, and the middle steel bar 2 refers to the steel bar located in the lower part of the cast-in-place layer. Whether to bury the middle steel bar 2 can be designed according to actual needs.

[0016] h3 is the diameter of the upper chord steel bar 3 of the truss, h3a is the distance between the upper part of the upper chord steel bar 3 of the truss and the upper part of the precast floor slab 7, h4 is the diameter of the X-direction pipeline 4, h5 is the diameter of the Y-direction pipeline 5, c is the thickness of the protective layer 11, and H is the thickness of the cast-in-place layer 6.

[0017] S2. Pipeline position classification; Position A is the middle area of the steel bar mesh formed by the X-direction and Y-direction steel bars of the upper-layer steel bar 1 in the cast-in-place layer, position B is on the X-direction or Y-direction steel bar of the upper-layer steel bar 1 in the cast-in-place layer, and position C is at the intersection of the X-direction and Y-direction steel bars of the upper-layer steel bar 1 in the cast-in-place layer.

[0018] S3. Calculate the most unfavorable net space size after deducting the influence of steel bars in the cast-in-place layer 6 at different positions of the equipment pipelines; When the pipeline is at position A, the most unfavorable net space size above the upper chord steel bar 3 of the truss after deducting the influence of steel bars in the cast-in-place layer 6 is: hjA = H - c - h3a; When the pipeline is at position B, the most unfavorable net space size above the upper chord steel bar 3 of the truss after deducting the influence of steel bars in the cast-in-place layer 6 is: hjB = H - c - h1a - h3a; When the pipeline is at position C, the most unfavorable net space size above the upper chord steel bar 3 of the truss after deducting the influence of steel bars in the cast-in-place layer 6 is: hjC = H - c - h1 - h3a; When the pipeline is at position A, the most unfavorable net space size below the upper chord steel bar 3 of the truss after deducting the influence of the steel bars in the cast-in-place layer 6 is: hjA1 = h3a - h3; When the pipeline is at position B, the most unfavorable net space size below the upper chord steel bar 3 of the truss after deducting the influence of the steel bars in the cast-in-place layer 6 is: hjB1 = h3a - h3 - h2a; When the pipeline is at position C, the most unfavorable net space size below the upper chord steel bar 3 of the truss after deducting the influence of the steel bars in the cast-in-place layer 6 is: hjC1 = h3a - h3 - h2; In the case where the intermediate steel bar 2 is not provided in the structural design, h2 = 0 and h2a = 0.

[0019] S4. Compare and process the most unfavorable net space sizes hjA, hjB, hjC and hjA1, hjB1, hjC1 obtained through the above steps with the diameter h4 of the pipeline 4 in the X direction, the diameter h5 of the pipeline 5 in the Y direction and their combined value h4 + h5; If hjC > h4, the pipeline 4 in the X direction passes through at position C and above the upper chord steel bar 3 of the truss; If hjB > h4, the pipeline 4 in the X direction passes through at position B and above the upper chord steel bar 3 of the truss; If hjA > h4, the pipeline 4 in the X direction passes through at position A and above the upper chord steel bar 3 of the truss; If hjC1 > h5, the pipeline 5 in the Y direction passes through at position C and below the upper chord steel bar 3 of the truss; If hjB1 > h5, the pipeline 5 in the Y direction passes through at position B and below the upper chord steel bar 3 of the truss; If hjA1 > h5, the pipeline 5 in the Y direction passes through at position A and below the upper chord steel bar 3 of the truss; If hjC1 > h5 and hjC1 + hjC > h4 + h5, the intersection point of the pipeline 4 in the X direction and the pipeline 5 in the Y direction is set at position C; If hjB1 > h5 and hjB1 + hjB > h4 + h5, the intersection point of the pipeline 4 in the X direction and the pipeline 5 in the Y direction is set at position B; If hjA1 > h5 and hjA1 + hjA > h4 + h5, the intersection point of the pipeline 4 in the X direction and the pipeline 5 in the Y direction is set at position A; The fixed logic of the above relationships is: hjA > hjB > hjC, hjA1 > hjB1 > hjC1, hjA + hjA1 > hjB + hjB1 > hjC + hjC1, hjA > hjA1, hjB > hjB1, hjC > hjC1; Based on the above analysis, the basic principle of refined design of equipment pipeline layout is determined, that is, compare the diameters of pipelines 4 in the X direction and pipelines 5 in the Y direction, or the superimposed diameters of pipelines 4 in the X direction and pipelines 5 in the Y direction with the size of the most unfavorable net space in the cast-in-place layer 6, and determine the positions and routing of equipment pipeline intersection points.

[0020] S5. Based on the above analysis, draw a conclusion on the refined design of pipeline layout; For single-layer equipment pipelines, due to the existence of the above relationships of hjA > hjA1, hjB > hjB1, and hjC > hjC1, select the pipeline with the smaller diameter among pipelines 4 in the X direction or pipelines 5 in the Y direction to pass through the net space below the upper chord steel bars 3 of the truss, and select the pipeline with the larger diameter among pipelines 4 in the X direction or pipelines 5 in the Y direction to pass through the net space above the upper chord steel bars 3 of the truss; For single-layer equipment pipelines, according to the above steps, judge the appropriate positions A, B, or C through which the equipment pipelines pass. Due to the existence of the above relationship of hjA > hjB > hjC, the preferred position for the equipment pipelines to pass through is position A, followed by position B, and then position C; For double-layer equipment pipelines, the intersection points of pipelines 4 in the X direction and pipelines 5 in the Y direction are judged according to step S4 to determine the appropriate positions through which the pipelines pass. Due to the existence of the above relationship of hjA + hjA1 > hjB + hjB1 > hjC + hjC1, the preferred position for the intersection points is position A, followed by position B, and then position C.

[0021] A composite floor slab in this embodiment includes a precast floor slab 7, a cast-in-place layer 6, and a protective layer 11 that are laminated together from bottom to top. The cast-in-place layer 6 is embedded with upper skin steel bars 1, upper chord steel bars 3 of the truss, and equipment pipelines. The upper skin steel bars 1 are in a mesh shape and are located at the upper part of the cast-in-place layer 6, and the upper chord steel bars 3 of the truss and the equipment pipelines are below the upper skin steel bars 1. Intermediate steel bars 2 can also be embedded in the cast-in-place layer according to actual needs. The intermediate steel bars 2 are in a mesh shape and are located at the lower part of the cast-in-place layer 6. At this time, the upper chord steel bars 3 of the truss and the equipment pipelines are between the upper skin steel bars 1 and the intermediate steel bars 2. The equipment pipelines include pipelines 4 in the X direction and pipelines 5 in the Y direction, and the pipelines 4 in the X direction and pipelines 5 in the Y direction are arranged according to the above method for refined layout of pipelines in the cast-in-place layer of the composite floor slab.

[0022] The upper chord steel bars 3 of the truss are pre-embedded and cast together with the precast slab. The cast-in-place layer 6 is a concrete layer cast on the precast floor slab 7, and the precast floor slab 7 provides a supporting function for the cast-in-place layer below.

[0023] The above upper skin steel bars 1, intermediate steel bars 2, upper chord steel bars 3 of the truss, pipelines 4 in the X direction and pipelines 5 in the Y direction, cast-in-place layer 6, precast floor slab 7, and protective layer 11 all objectively exist in actual structural design, and the relevant numerical values are taken according to actual design.

[0024] The present invention comprehensively considers the number of steel bars in the cast-in-place layer, the steel bar spacing, and the position of the upper chord steel bar of the truss, and details the analysis of the thickness of the cast-in-place layer, the distribution of the cast-in-place layer steel bars, the truss steel bars in the precast slab, and the situation where there are many pipelines and they are concentrated. The basic control principle of the refined design of pipeline layout is determined: compare the diameters of the pipelines in the X direction and the Y direction or the superimposed diameters with the size of the net space after deducting the pipelines in the cast-in-place layer, so as to determine the intersection position and routing of the pipelines during the implementation stage, making up for the defect in the existing design that there is no refined design for the layout of equipment pipelines in the precast and cast-in-place composite floor slab. The pipeline position is rationally designed, and the pipelines are arranged in the concentrated area, so that the pipelines can smoothly pass through the net space after deducting the influence of the steel bars, in order to solve practical problems such as the top elevation of the pipelines exceeding the thickness of the cast-in-place layer, the leakage of pipelines caused by the dense arrangement of pipelines, the cracking of the structural floor slab, and the difficulty in arranging pipelines due to the large number of distribution layers of the cast-in-place layer steel bars, ensuring the durability and structural safety of the floor slab, realizing the pipeline layout and functions, and improving the construction efficiency.

[0025] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A method for finely arranging pipelines in a cast-in-place layer of a composite floor, characterized in that: The following steps are involved: S1. Parameter setting; h1 is the sum of the diameters of the upper skin reinforcement (1) in the X direction and the Y direction, h1a is the larger diameter of the upper skin reinforcement (1) in the X direction and the Y direction, h2 is the sum of the diameters of the middle reinforcement (2) in the X direction and the Y direction, h2a is the larger diameter of the middle reinforcement (2) in the X direction and the Y direction, h3 is the diameter of the truss upper chord reinforcement (3), h3a is the distance between the upper skin of the truss upper chord reinforcement (3) and the upper skin of the precast floor slab (7), h4 is the diameter of the X direction pipeline (4), h5 is the diameter of the Y direction pipeline (5), c is the thickness of the protective layer (11), and H is the thickness of the cast-in-place layer (6); S2. Pipeline location classification; Position A is the middle area of ​​the steel mesh formed by the X-direction steel bars and the Y-direction steel bars of the upper skin steel bars (1) in the cast-in-place layer; Position B is on the X-direction steel bars or the Y-direction steel bars of the upper skin steel bars (1) in the cast-in-place layer; Position C is on the intersection of the X-direction steel bars and the Y-direction steel bars of the upper skin steel bars (1) in the cast-in-place layer; S3. Calculate the most unfavorable net space size of equipment pipelines at different locations in the cast-in-place layer (6) after deducting the influence of steel bars; When the pipeline is at position A, the most unfavorable net space size above the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjA=Hc-h3a; When the pipeline is at position B, the most unfavorable net space size above the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjB = Hc-h1a-h3a; When the pipeline is at position C, the most unfavorable net space size above the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjC = Hc-h1-h3a; When the pipeline is at position A, the most unfavorable net space size below the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjA1=h3a-h3; When the pipeline is at position B, the most unfavorable net space size below the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjB1=h3a-h3-h2a; When the pipeline is at position C, the most unfavorable net space size below the truss upper chord reinforcement (3) in the cast-in-place layer (6) after deducting the influence of the reinforcement is: hjC1=h3a-h3-h2; When the structural design does not include intermediate reinforcement (2), h2=0, h2a=0; S4. Compare the diameters of the X-direction pipeline (4) and the Y-direction pipeline (5) or the superimposed diameters of the X-direction pipeline (4) and the Y-direction pipeline (5) with the size of the most unfavorable net space in the cast-in-place layer (6) to determine the location and route of the equipment pipeline intersection; If hjC>h4, the X-direction pipeline (4) is at position C and passes above the upper chord reinforcement (3) of the truss; If hjB>h4, the X-direction pipeline (4) is at position B and passes above the upper chord reinforcement (3) of the truss; If hjA>h4, the X-direction pipeline (4) is at position A and passes above the upper chord reinforcement (3) of the truss; If hjC1>h5, the Y-direction pipeline (5) is at position C and passes below the upper chord reinforcement (3) of the truss; If hjB1>h5, the Y-direction pipeline (5) is at position B and passes below the upper chord reinforcement (3) of the truss; If hjA1>h5, the Y-direction pipeline (5) is at position A and passes below the upper chord reinforcement (3) of the truss; If hjC1>h5 and hjC1+hjC>h4+h5, the intersection of the X-direction pipeline (4) and the Y-direction pipeline (5) is set at position C; If hjB1>h5 and hjB1+hjB>h4+h5, the intersection of the X-direction pipeline (4) and the Y-direction pipeline (5) is set at position B; If hjA1>h5 and hjA1+hjA>h4+h5, the intersection of the X-direction pipeline (4) and the Y-direction pipeline (5) is set at position A; The fixed logic of the above relationship is: hjA>hjB>hjC, hjA1>hjB1>hjC1, hjA+hjA1>hjB+hjB1>hjC+hjC1, hjA>hjA1, hjB>hjB1, hjC>hjC1.

2. The method for finely arranging pipelines in the cast-in-place layer of a composite floor according to claim 1 is characterized in that: The step S5 is also included: S5. Draw conclusions on the refined design of pipeline layout; For a single-layer pipeline, the X-direction pipeline (4) or the Y-direction pipeline (5) with a smaller diameter is selected to pass through the clear space below the truss upper chord steel bar (3), and the X-direction pipeline (4) or the Y-direction pipeline (5) with a larger diameter is selected to pass through the clear space above the truss upper chord steel bar (3). The preferred position for the equipment pipeline to pass through is position A, followed by position B, and then position C; For the double-layer pipeline, the intersection of the X-direction pipeline (4) and the Y-direction pipeline (5) is determined according to step S4 to be a suitable position for the pipeline to pass through, and the intersection position is preferably position A, followed by position B, and then position C.

3. A composite floor slab, comprising a prefabricated floor slab (7), a cast-in-place layer (6) and a protective layer (11) which are stacked together from bottom to top, wherein the cast-in-place layer (6) is embedded with an upper skin steel bar (1), a truss upper chord steel bar (3) and equipment pipelines, wherein the upper skin steel bar (1) is mesh-shaped and located at the upper part of the cast-in-place layer (6), the truss upper chord steel bar (3) and the equipment pipelines are located below the upper skin steel bar (1), and the equipment pipelines include an X-direction pipeline (4) and a Y-direction pipeline (5), characterized in that: The X-direction pipeline (4) and the Y-direction pipeline (5) are arranged according to the method for finely arranging pipelines in a cast-in-place layer of a composite floor slab according to any one of claims 1 to 2.

4. The composite floor slab according to claim 3, characterized in that: The cast-in-place layer (6) is also embedded with intermediate steel bars (2), the intermediate steel bars (2) are mesh-shaped and are located at the bottom of the cast-in-place layer (6), and the truss upper chord steel bars (3) and equipment pipelines are between the upper skin steel bars (1) and the intermediate steel bars (2).

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