Assembly type airport pavement structure connected through bolts

Abstract

The utility model discloses a bolted assembly type airport pavement structure, which comprises a plurality of adjacent prefabricated concrete upper cover plates and a plurality of prefabricated concrete base plates, the prefabricated concrete upper cover plates and the prefabricated concrete base plates are in bolted connection, each prefabricated concrete upper cover plate comprises an upper cover plate central part and four flange parts, the upper cover plate central part is a cube with the thickness of h, four flange parts with the thickness of h / 2 are arranged on the upper edges of the four side edges of the central part of the upper cover plate and partially extend outwards, the length of the long edge of each flange part is smaller than that of the central part of the upper cover plate, and the adjacent flange parts are not connected with each other; a boss is formed in the middle of the square precast concrete base plate with the thickness of h / 2, and the top face of the boss and the top face of the precast concrete upper cover plate are spliced to form a complete plane. The connecting mode is simple and practical, assembling and disassembling operation is easy and convenient, force transmission performance is excellent, and the stress requirement of an airport pavement structure is completely met.

Description

TECHNICAL FIELD

[0001] The utility model relates to airport pavement facility technical field in road engineering, especially a kind of bolted assembly type airport pavement structure. BACKGROUND

[0002] With the rapid development of global aviation industry, the demand for airport construction is also increasing. In order to meet the growing demand for air transportation, airports need to expand and upgrade their infrastructure, including runway, apron and other pavement facilities. Currently, modern airport concrete pavement faces many challenges, such as poor durability, high load capacity requirement, high demand for flexural strength and fatigue resistance, etc. The traditional design method of concrete pavement has been difficult to meet the requirements of modern large aircraft. Therefore, new pavement construction technology needs to be developed to meet these challenges.

[0003] Assembly type pavement as a new construction method can meet the needs of modern airport concrete pavement and gradually become an important choice in airport construction field due to its fast construction speed, high engineering quality and other advantages. However, the current pavement panel has weak load transfer ability between panels, and it is difficult to replace, which seriously increases the construction and maintenance cost of the airport. SUMMARY

[0004] In order to solve the problems raised in the background art, the utility model provides a bolted assembly type airport pavement structure with strong inter-panel load transfer capacity, convenient replacement of pavement panels and low construction difficulty.

[0005] Therefore, the utility model adopts the following technical solutions:

[0006] A bolted assembly type airport pavement structure includes a plurality of precast concrete top cover plates and a plurality of precast concrete base plates, which are adjacent to each other and fixedly connected, wherein:

[0007] The precast concrete top cover plate includes a top cover plate center and four flange parts. The top cover plate center is a square body with a thickness of h. The four flange parts are formed by partially extending outward from the upper edges of the four sides of the top cover plate center. The long side length of the flange part is less than the side length of the top cover plate center. The thickness of the adjacent flange part is h / 2, and the top surface of the flange part is coplanar with the top surface of the top cover plate center.

[0008] The middle part of the square precast concrete base plate with a thickness of h / 2 forms a boss (square). The height of the boss is h / 2.

[0009] The width of the flange part is the same as the distance from the bottom side of the boss to the nearest side of the precast concrete base plate. The four flange parts of each precast concrete top cover plate are connected to the corresponding precast concrete base plate.

[0010] The top surface of the boss is spliced with the top surface of the prefabricated concrete upper cover plate to form a complete plane.

[0011] A single row of fixing bolts is equidistantly arranged near the four corner edges of the prefabricated concrete base plate, the screw rod end of the fixing bolt is vertically embedded into the prefabricated concrete base plate, and the distance between the nut end of the fixing bolt and the lower bottom surface of the prefabricated concrete base plate is h / 4.

[0012] Preferably, the diameter of the fixing bolt is d, the distance between the centers of two adjacent fixing bolts is greater than 3d0, and the distance from the edge of the prefabricated concrete base plate to the center of the fixing bolt is greater than 2d0; d0 is the minimum allowable distance of the bolt, d0=d+1.5mm.

[0013] A single row of through holes is equidistantly arranged on the flange part, and a recess hole is arranged on the top surface of the prefabricated concrete upper cover plate at the position of the top of the through hole, for mounting a fixing nut.

[0014] Three through holes are arranged on each of the flange parts; and four fixing bolts are arranged on the edge of each side of the prefabricated concrete base.

[0015] Preferably, the distance between the through holes is greater than 3d0, and the distance from the edge of the prefabricated concrete upper cover to the center of the through hole is greater than 2d0.

[0016] The size of the recess hole is greater than that of the fixing nut, and a hard plastic plug is further arranged on the fixing nut, for filling the recess hole.

[0017] The fixing nut is screwed together with the corresponding prefabricated concrete upper cover plate through the fixing bolt.

[0018] Compared with the prior art, the prefabricated concrete base plate and the prefabricated concrete upper cover plate are connected through the fixing nut and the fixing bolt, so that the prefabricated concrete base plate and the prefabricated concrete upper cover plate are connected in a simple and practical manner.

[0019] 1. Compared with the existing prefabricated pavement plate structure, the pavement structure of the utility model solves the problems of insufficient load transmission between two plates, difficulty in replacing pavement plates and large construction difficulty.

[0020] 2. The pavement structure of the utility model can greatly shorten the maintenance time, thereby improving the operation efficiency of the airport.

[0021] 3. The connection mode and connection structure of the pavement structure in the utility model are simple and practical, the assembly and disassembly operation is simple, the force transmission performance is superior, and the force transmission performance meets the force requirement of the airport pavement structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1A partial structure schematic view of the assembly type airport pavement structure in the embodiment of the utility model;

[0023] Figure 2 A structure schematic view of the prefabricated concrete base plate in the embodiment of the utility model;

[0024] Figure 3 A bottom structure schematic view of the prefabricated concrete upper cover plate in the embodiment of the utility model;

[0025] Figure 4 A top structure schematic view of the prefabricated concrete upper cover plate in the embodiment of the utility model;

[0026] Figure 5 A partial structure schematic view of the assembly type airport pavement structure in the embodiment of the utility model, in order to facilitate the description of the construction process and the connecting relationship between the parts, the fixed nut and the hard plastic plug are highlighted in the drawing;

[0027] Figure 6 A cross section structure schematic view of the fixed bolt position in the embodiment of the utility model.

[0028] In the drawing: 1. prefabricated concrete upper cover plate, 101. upper cover plate center part, 102. flange part, 103. through hole, 2. prefabricated concrete base plate, 201. boss, 202. fixed bolt, 203. fixed nut, 204. hard plastic plug. DETAILED DESCRIPTION

[0029] The technical scheme of the utility model will be further described in detail in combination with the drawings and embodiments.

[0030] As Figures 1 to 5 shown, the bolt connected assembly type airport pavement structure of the utility model includes a plurality of prefabricated concrete upper cover plates 1 and a plurality of prefabricated concrete base plates 2 adjacent to each other and fixedly connected, wherein:

[0031] The prefabricated concrete upper cover plate 1 includes an upper cover plate center part 101 and four flange parts 102, the upper cover plate center part 101 is a cube with a thickness of h, the thickness of the flange part 102 is h / 2, the four flange parts 102 are formed by the upper edge of the four sides of the upper cover plate center part 101 extending outward locally; the long side length of the flange part 102 is less than the side length of the upper cover plate center part 101, the adjacent flange parts 102 with a thickness of h / 2 do not contact each other, and the top surface of the flange part 102 is coplanar with the top surface of the upper cover plate center part 101.

[0032] The middle part of the square prefabricated concrete base plate 2 with a thickness of h / 2 is formed with a boss 201, and the height of the boss 201 is h / 2;

[0033] The width of the flange part 102 is the same as the distance from the side of the nearest precast concrete base plate 2 to the side of the bottom of the boss 201, and the four flange parts 102 of each precast concrete upper cover plate 1 are connected to the corresponding precast concrete base plate 2.

[0034] The top surface of the boss 201 and the top surface of the precast concrete upper cover plate 1 are spliced together to form a complete plane.

[0035] Embodiment one

[0036] As shown in Figure 2 , a single row of fixed bolts 202 is arranged equidistantly on the edge top surface of the precast concrete base plate 2; the diameter of the fixed bolt 202 is d, the distance between the centers of two adjacent fixed bolts 202 is greater than 3d0, and the distance from the edge of the precast concrete base plate 2 to the center of the fixed bolt 202 is greater than 2d0; d0 is the minimum allowable distance of the bolt, d0 = d + 1.5mm. The precast concrete base plate 2 is provided with fixed bolts 202 at the four corners.

[0037] As shown in Figures 3 to 4 , a single row of through holes 103 is arranged equidistantly on the flange part 102 of the precast concrete upper cover plate 1, and a hexagonal recess is formed at the top of the through hole for installing a fixed nut 203. The fixed bolt 202 passes through the through hole 103 and is fixed by the fixed nut to connect adjacent precast concrete upper cover plates 1 and precast concrete base plates 2; the distance between the through holes 103 is greater than 3d0, and the distance from the edge of the precast concrete upper cover plate 1 to the center of the through hole 103 is greater than 2d0.

[0038] Embodiment two

[0039] As shown in Figure 5 , on the basis of embodiment one, three through holes are arranged equidistantly on the flange part 102; on the precast concrete base plate 2, in addition to the four corners near which fixed bolts 202 are arranged, two fixed bolts 202 are also arranged on each edge. A hard plastic plug 204 is installed on the top of the fixed nut 203 to fill the hexagonal recess at the top of the through hole. The size of the hexagonal recess is 1.5 times that of the fixed nut 203.

[0040] Embodiment three

[0041] Airport pavement foundation construction is a key link to ensure the long-term stable use of runways, taxiways and parking aprons, and its construction quality directly affects the bearing capacity, durability and safety of the pavement. The following is the detailed process of the airport pavement pre-construction foundation construction:

[0042] Preparation before construction:

[0043] Detailed geological exploration (drilling, soil test, etc.) should be carried out before construction: determine the distribution of soil layers, bearing capacity, groundwater level, etc. and evaluate the compressibility, expansibility, frost heaving sensitivity, etc. of the foundation to provide a basis for design. Select the foundation type (flexible / rigid pavement) according to the aircraft load (such as ACN-PCN system), climate conditions, etc.

[0044] Site cleaning and leveling: remove surface humus, organic matter such as tree roots, and fill the area in layers (≤30 cm per layer), set up temporary drainage facilities to prevent water immersion of the foundation.

[0045] Foundation treatment, including:

[0046] 1. In-situ ground treatment: replace, ramming or cement mixing pile reinforcement for soft soil (such as silt, clay), and preloading (stacking or vacuum preloading) for high fill area to reduce post-construction settlement.

[0047] 2. Foundation layer construction: granular base (such as graded crushed stone): first, layer paving (15-20 cm per layer). Then use a vibrating roller to compact (static pressure 1 pass + vibration pressure 4-6 passes + final pressure 1 pass). Finally, check whether the flatness meets the specification requirements.

[0048] 3. Cement stabilized base (water stabilized layer): mixed with plant mixing method, continuous operation of paver (avoid longitudinal joint). After rolling, cover geotextile and water curing for 7 days to prevent dry shrinkage cracks.

[0049] After the completion of the airport pavement foundation construction, in order to avoid cracking and damage of the paved pavement and reduce pavement wear and prolong the service life, the flatness needs to be detected. After the detection is qualified, the assembly of the prefabricated airport pavement structure is carried out.

[0050] When assembling, first place four prefabricated concrete base plates 2 as shown in Figure 5 , then assemble the prefabricated concrete upper cover plate 1, which is at the center position of the space surrounded by the four prefabricated concrete base plates 2. After assembly, first grout between the fixing bolt and the through hole, then screw the fixing nut 203 onto the fixing bolt 202, and finally fill the regular hexagonal recess with a hard plastic plug 204 to complete the assembly.

[0051] As shown in Figure 6 , the shank end of the fixing bolt 202 is vertically embedded in the prefabricated concrete base plate 2, and the distance between the nut end of the fixing bolt 202 and the lower bottom surface of the prefabricated concrete base plate 2 is h / 4.

[0052] Example Four

[0053] During subsequent use, if the bolt needs to be replaced due to loosening, the hard plastic plug 204 needs to be removed and the fixing nut 203 needs to be tightened.

[0054] If the prefabricated concrete upper cover plate 1 is damaged, the hard plastic plug 204 is removed first, the fixing nut 203 is removed, and then the prefabricated concrete upper cover plate 1 is replaced, and after replacement, the assembly is reassembled.

[0055] If the prefabricated concrete base plate 2 is damaged and needs to be replaced, first, the hard plastic plug 204 on the four prefabricated concrete upper cover plates 1 connected to the prefabricated concrete base plate 2 is removed, then the connected fixing nut 203 is removed in turn, then the corresponding four prefabricated concrete upper cover plates 1 are removed, and finally the damaged pavement plate 2 is removed for replacement. After replacement, the assembly is reassembled.

[0056] Example five

[0057] The feasibility of the present application is illustrated by an embodiment of the present application as follows:

[0058] In this embodiment, B737 is taken as an example, the maximum single wheel load of Boeing series aircraft is 555KN, and the maximum vertical force applied to the ground by the aircraft during the landing process. In this embodiment, the two wheels on the main landing gear of the Boeing 737 land at the same time during landing, so the single pavement slab in the assembled airport pavement has to withstand a vertical force F = 555 * 2 = 1110KN.

[0059] According to the formula F S = F * μ, the horizontal force on the single pavement slab is calculated.

[0060] Where: F s is the horizontal force; μ is the friction coefficient between the aircraft tire and the pavement slab (in an ideal case, this coefficient may be a hypothetical constant value, but in actual cases, it is affected by various factors such as tire material, pavement slab material, temperature, humidity, etc.). The friction coefficient specified by ICAO ranges from a maximum of 0.8 to a minimum of 0.05, which covers various possible runway surface conditions and weather conditions. For calculating the maximum shear force on the pavement slab, μ = 0.8 in this embodiment; F S = 1110 * 0.8 = 888KN.

[0061] The size of the upper cover plate center of the prefabricated concrete upper cover plate 1 selected in this embodiment is 4m*4m*0.2m, the size of a single flange part is 3.5m*0.5m*0.1m, one side of the flange part is aligned with the side of the nearest upper cover plate center, and the other side of the flange part is 0.5m away from the side of the nearest upper cover plate center.

[0062] The size of the prefabricated concrete base plate 2 is 4m*4m*0.1m, and the size of the boss is 3m*3m*0.1m.

[0063] The precast concrete top cover plate 1 and the precast concrete base plate 2 both use C35 strength concrete, and 12 bolts are arranged for the precast concrete base plate 2 to make the four edges bear force uniformly, and 2 bolts are arranged on each side except the four corner points, and the distance between each bolt and the adjacent bolt is the same.

[0064] The bolt used in the embodiment is a 10.9 grade pressure type connecting high-strength bolt, the bolt diameter d is 18 mm, d0 is the minimum allowable distance d0 = 18 mm + 1.5 mm = 19.5 mm, the effective diameter d of the bolt is 15.6545 mm, and the bolt material is Q460 steel. e

[0065] According to the formula , the shear bearing capacity of the bolt is calculated;

[0066] Wherein, n v is the number of shear planes of each bolt, is the shear strength design value of the bolt, which is 310 MPa; and

[0067] According to the formula , the pressure bearing capacity of the bolt is calculated;

[0068] Wherein, ∑t is the smaller value of the total thickness of the pressure bearing component in different stress directions; is the pressure strength design value of the bolt, which is 695 MPa; and

[0069] According to the formula n1 = F S / [N], the number of bolts required for the shear resistance of the precast concrete base plate is calculated;

[0070] Wherein, [N] is the minimum value of the pressure bearing capacity and the shear bearing capacity of the bolt, so the shear bearing capacity of the bolt is selected to be n1 = 11.26, so in order to meet the pressure requirement, the number of bolts is at least 12.

[0071] According to the formula , the bearing capacity of each tension bolt is calculated;

[0072] Wherein, is the tensile strength design value of the bolt, which is 500 MPa; and

[0073] According to the formula , the number of bolts required for the tensile resistance is calculated; n2 = 11.5, so the number of bolts required for the tensile resistance is 12.

[0074] ​The 12 fixing bolts used in the embodiment satisfy the stress conditions mentioned above.

[0075] According to the formula V cs = a cv f t bh, wherein a cv is the shear capacity coefficient of the oblique section, and is 0.7 for a general bending member; f t is the design value of the axial tensile strength of the concrete, and is 1.57; b is the length of the concrete slab, and is 3500; and h is the thickness of the concrete slab, and is 100; thus V cs = 384650 N.

[0076] According to the formula V cs = a cv f t bh, wherein a cv is the shear capacity coefficient of the oblique section, and is 0.7; f t is the design value of the axial tensile strength of the concrete, and is 1.57; b is the length of the concrete slab, and is 4000; and h is the thickness of the concrete slab, and is 100; thus V cs = 439600 N.

[0077] The vertical force of the flange part on one side of the prefabricated concrete base slab is 1110 / 4 = 277.5 KN. Moreover, 277.5 KN < 439.6 KN and 277.5 KN < 384.65 KN, so the prefabricated concrete upper cover slab and the prefabricated concrete base slab assembled can completely withstand the stress applied by the airplane.

Claims

1. A bolted assembled airport pavement structure, characterized by, The utility model relates to a prefabricated concrete roof plate and a prefabricated concrete base plate, and belongs to the field of building materials. The prefabricated concrete roof plate (1) comprises a roof plate center part (101) and four flange parts (102), the roof plate center part (101) is a cube with a thickness of h, the four flange parts (102) are formed by the upper edges of the four sides of the roof plate center part (101) extending outward, the long side length of the flange part (102) is smaller than the side length of the roof plate center part (101), the thickness of the adjacent flange parts (102) is h / 2, the top surface of the flange part (102) is coplanar with the top surface of the roof plate center part (101), the middle part of the square prefabricated concrete base plate (2) with a thickness of h / 2 is provided with a boss (201), the height of the boss (201) is h / 2, the width of the flange part (102) is the same as the distance between the bottom side of the boss (201) and the side of the prefabricated concrete base plate (2) closest to the boss (201), the four flange parts (102) of each prefabricated concrete roof plate (1) are connected with the corresponding prefabricated concrete base plate (2), the top surface of the boss (201) is spliced with the top surface of the prefabricated concrete roof plate (1) to form a complete plane. The prefabricated concrete base plate (2) is provided with a single row of fixed bolts (202) near the four peripheral edges at equal distances. The diameter of the fixed bolt (202) is d, the center distance between two adjacent fixed bolts (202) is greater than 3d0, the distance between the edge of the prefabricated concrete base plate (2) and the center of the fixed bolt (202) is greater than 2d0, d0 is the minimum allowable distance of the bolt, d0=d+1.5mm. The screw rod end of the fixed bolt (202) is vertically embedded in the prefabricated concrete base plate (2), and the distance between the nut end of the fixed bolt (202) and the lower bottom surface of the prefabricated concrete base plate (2) is h / 4. The prefabricated concrete base plate (2) is provided with a fixed bolt (202) near each corner.

2. The bolted assembled airport pavement structure according to claim 1, characterized in that: A single row of through holes (103) is arranged on the flange part (102) at equal distances, a recessed hole is formed on the top surface of the prefabricated concrete roof plate (1) at the top position of the through hole (103) for mounting a fixed nut (203), 3. The bolted assembled airport pavement structure according to claim 2, characterized in that: The fixed nut (203) is screwed together with the prefabricated concrete base plate (2) and the corresponding prefabricated concrete roof plate (1) through the fixed bolt (202).

4. The bolted assembled airport pavement structure according to claim 2, wherein: The distance between the through holes (103) is greater than 3d0, and the distance between the edge of the prefabricated concrete roof plate (1) and the center of the through hole (103) is greater than 2d0.

5. The bolted assembled airport pavement structure according to claim 2, wherein: Each flange part (102) is provided with three through holes (103), and each side edge of the prefabricated concrete base plate (2) is provided with four fixed bolts (202).

6. The bolted assembled airport pavement structure according to claim 5, characterized in that: The size of the recessed hole is greater than the size of the fixed nut (203), and a hard plastic plug (204) is mounted on the fixed nut (203) to fill the recessed hole. ​ 7. The bolted assembled airport pavement structure according to claim 6, characterized in that: ​ 8. The bolted assembled airport pavement structure according to claim 6, wherein: ​ 9. The bolted assembled airport pavement structure according to claim 6, characterized in that: ​

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