Bolt-connected square assembly type airport pavement connecting node

Abstract

The utility model discloses a square assembly type airport pavement connecting node connected through bolts, which comprises concrete pavement slabs, cross-shaped concrete connecting plates, screws and a grouting layer, the lower concrete connecting plate is connected with the upper concrete pavement slab through bolts, and the lower concrete connecting plate is connected with the upper concrete pavement slab through bolts. The top surfaces of the concrete pavement slabs and the top surfaces of the adjacent concrete pavement slabs are mutually spliced to form a continuous plane serving as an airport pavement; the grouting layer is used for fixedly connecting the screw rod with the concrete pavement slab; the cross-shaped concrete connecting plate is a square plate with the four side edges extending outwards by the same length, and the extending length of the cross-shaped concrete connecting plate is half of the side length of the square plate. A square boss is arranged on the bottom surface of the concrete pavement slab, and the boss is embedded into a cavity formed by splicing the adjacent concrete connecting plates, so that the bottom surface of the boss and the bottom surfaces of the concrete connecting plates form a continuous plane. The device is simple in structure, convenient to assemble and disassemble and good in force transmission effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of airport pavement facilities in road engineering, especially relates to a connecting mode of assembled airport pavement. BACKGROUND

[0002] With the rapid development of aviation industry, airport construction is increasingly important. As the core component of airport infrastructure, the quality and stability of airport pavement are directly related to aviation safety and operational efficiency. The traditional concrete pouring method has problems such as long construction period and difficult quality guarantee. Therefore, in order to improve the construction efficiency and quality of airport pavement, the assembled pavement technology emerges as the times require. The assembled pavement has the characteristics of reliable connection, easy disassembly and maintenance, and is suitable for pavement areas that need to be frequently replaced or repaired, so it is widely used in airport and highway construction. However, the following problems may occur in the practical application of the assembled pavement:

[0003] (1) The traditional mortise and tenon assembled pavement panel has high processing precision requirements for the prefabricated concrete panel, and the precision of the concrete pouring mold must be strictly controlled. In addition, when the pavement panel needs to be replaced for local repair, it is difficult to take out and repair the pavement panel due to the tight engagement of the mortise and tenon between the two panels, so the post-repair of the pavement panel is difficult.

[0004] (2) The traditional dowel bar connection method also has high processing precision requirements for the prefabricated concrete panel, and the mold precision of the concrete pouring must also be strictly controlled to achieve good engagement of the dowel bar slot and the dowel bar. In addition, the load transmission mechanism between the panels of this bar connection method has insufficient load transmission capacity, making the disassembly and construction process of the pavement panel extremely difficult, which cannot meet the urgent needs of rapid maintenance of the pavement. INVENTION CONTENTS

[0005] In order to solve the problems mentioned in the background art, the utility model provides a bolted square assembled airport pavement connection node which is convenient to disassemble, reduces the maintenance time of the airport pavement, and improves the operational efficiency of the airport.

[0006] Therefore, the utility model adopts the following technical solutions:

[0007] A bolted square assembled airport pavement connection node, comprising: a concrete pavement panel, a cross-shaped concrete connection plate, and a grouting layer, wherein:

[0008] The concrete connection plate is formed by extending the four sides of the square plate outward by the same length, and the length of the extension is half of the side length of the square plate;

[0009] The bottom surface of the concrete pavement panel is provided with a square boss, which is embedded in a hollow formed by four adjacent concrete connecting panels, so that the boss and the concrete connecting panel form a continuous plane.

[0010] The lower concrete connecting panel and the upper concrete pavement panel are connected by a screw rod, so that the top surface of the concrete pavement panel and the top surface of the adjacent concrete pavement panel are spliced to form a continuous plane as an airport pavement.

[0011] The grouting layer is used to fixedly connect the screw rod and the concrete pavement panel.

[0012] Preferably, a single row of upper through-holes is equidistantly arranged on the edge of the concrete pavement panel, and lower through-holes are arranged on the concrete connecting panel; the upper through-holes and the lower through-holes correspond one by one, so that the screw rod passes through them and screws the corresponding concrete pavement panel and concrete connecting panel together.

[0013] Preferably, a lower nut is fixedly arranged at the top of the lower through-hole; and an upper nut is fixedly arranged at the top of the upper through-hole through the grouting layer.

[0014] The screw rod and the upper nut and the lower nut are threadedly connected, and the diameter of the upper through-hole is 1.5 times the diameter of the upper nut.

[0015] Preferably, the upper through-holes are arranged at the four corners of the concrete pavement panel.

[0016] Preferably, the minimum distance of the upper through-hole from the edge is 2d0, and the minimum distance between adjacent through-holes is 3d0, d0 is the minimum allowable distance of the bolt, d0=d+1.5mm, and d is the diameter of the screw rod.

[0017] Preferably, the minimum distance of the lower through-hole from the edge is 2d0, and the minimum distance between adjacent through-holes is 3d0, d0 is the minimum allowable distance of the bolt, d0=d+1.5mm, and d is the diameter of the screw rod.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The two prefabricated concrete panels are connected by bolts and nuts to transmit vertical force, making the pavement panel more convenient to assemble and disassemble, and the force transmission effect is better, solving the problems of insufficient load transmission capacity between the two panels, difficulty in replacing the pavement panel, and large construction difficulty of the existing assembly type pavement panel. The airport pavement maintenance time can be minimized, and the airport operation efficiency can be improved.

[0020] 2. The connecting mode of the utility model has simple structure, convenient assembly and disassembly, good force transmission effect and can meet the stress requirement of the airport pavement structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a bottom view angle structure schematic view of the concrete pavement panel in the utility model;

[0022] Figure 2 It is a top view angle structure schematic view of the concrete connecting plate in the utility model;

[0023] Figure 3 It is a top view angle structure schematic view of the structure connected by the connecting joint of the utility model;

[0024] Figure 4 It is a bottom view angle structure schematic view of the structure connected by the connecting joint of the utility model.

[0025] In the drawing: 1. concrete pavement panel, 2. concrete connecting plate, 3. screw rod, 4. grouting layer, 101. upper layer screw hole, 102. upper layer nut, 103. boss, 201. lower layer screw hole, 202. lower layer nut. DETAILED DESCRIPTION

[0026] In Figure 3 order to facilitate the description of the connecting relationship of the concrete pavement panel and the concrete connecting piece, only one exposed screw rod and upper layer nut are reserved, and the rest of the screw rods and upper layer nuts exposed outside are hidden.

[0027] The technical scheme of the utility model will be further described in detail in combination with the drawings and embodiments.

[0028] As Figures 1-4 shown, the bolt connecting square assembly type airport pavement connecting joint of the utility model comprises:

[0029] The concrete pavement panel 1, the cross-shaped concrete connecting plate 2, the screw rod 3 and the grouting layer 4; the concrete connecting plate 2 located below is connected with the concrete pavement panel 1 located above through the bolt, so that the top surface of the concrete pavement panel 1 and the top surface of the adjacent concrete pavement panel 1 are spliced with each other to form a continuous plane as the airport pavement, and the grouting layer 4 is located in the upper layer screw hole 101; the concrete connecting plate is formed by extending the four sides of the square plate outward by the same length, and the extended length is half of the side length of the square plate;

[0030] The upper layer screw holes 101 are arranged on the edges of the concrete pavement panel 1 in a single row, and the lower layer screw holes 201 are arranged on the concrete connecting panel 2; the upper layer screw holes 101 correspond to the lower layer screw holes 201, and the screw rod 3 passes through the upper layer screw holes 101 and the lower layer screw holes 201 to screw the corresponding concrete pavement panel 1 and the concrete connecting panel 2 together; the lower layer screw holes 201 are fixedly provided with the lower layer nuts 202 at the top, and the size of the lower layer screw holes 201 is the same as that of the lower layer nuts 202;

[0031] The upper layer nuts 102 are arranged at the top of the upper layer screw holes 101, and the grouting layer 4 is formed by grouting around the upper layer nuts 102, the screw rod 3, the upper layer nuts 102 and the lower layer nuts 202 are threadedly connected, and the grouting layer 4 is used for fixing the upper layer nuts 102 and the screw rod 3 in the upper layer screw holes 101. The size of the upper layer screw holes 101 is 1.5 times that of the upper layer nuts 102.

[0032] The upper layer screw holes 101 are arranged at the four corners of the concrete pavement panel 1.

[0033] The bottom surface of the concrete pavement panel 1 is provided with a square boss 103, and the boss 103 is embedded in the hollow formed by the four adjacent concrete connecting panels 2, so that the boss 103 and the concrete connecting panel 2 form a continuous plane.

[0034] For the screw holes on the concrete pavement panel 1 and the concrete connecting panel 2, the minimum distance from the edge of the pavement panel is 2d0, and the minimum distance between adjacent screw holes is 3d0, d0 is the minimum allowable distance of the bolt, d0=d+15mm, and d is the diameter of the bolt.

[0035] When the concrete pavement panel 1 is assembled, the screw rod 3 is screwed upwards from the lower layer nuts 202 on the cross-shaped concrete connecting panel 2 first, then the concrete pavement panel 1 is assembled according to the corresponding screw holes, and then the upper layer nuts 102 are threadedly connected with the screw rod 3, and finally the grouting layer 4 is formed by grouting and filling the upper layer screw holes 101.

[0036] The feasibility of the utility model is illustrated by one embodiment as follows:

[0037] In the embodiment, the size of the concrete pavement panel is 4m*4m. The length of the square plate in the cross-shaped concrete connecting panel is 2.5m, and the length of the extension is 1.25m. The thickness of them is 200mm. The concrete pavement panel and the concrete connecting panel both use C35 strength concrete. In order to make the four edges of the concrete pavement panel bear force uniformly, 12 bolts are arranged, and the distribution is that 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.

[0038] The maximum single wheel load of Boeing series aircraft is 555 KN, and the maximum vertical force exerted by the aircraft on the ground during the landing process. In this embodiment, the Boeing 737 is taken as an example, and at the moment of landing, the two wheels on the main landing gear of the aircraft are in contact with the ground, so the single slab of the airport runway after assembly has to withstand a vertical force F = 555 * 2 = 1110 KN.

[0039] According to the formula F S = F * μ, the horizontal force on the single slab is calculated;

[0040] Wherein: F S is the horizontal force; μ is the friction coefficient between the aircraft tire and the runway slab (in an ideal case, this coefficient may be a hypothetical constant value, but in actual cases, it will be affected by various factors such as tire material, runway 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 slab, μ = 0.8 in this embodiment; F S = 1110 * 0.8 = 888 KN.

[0041] The bolt used in this embodiment is a 10.9 grade pressure type connecting high strength bolt, the screw diameter d is 20 mm, the minimum allowable distance d0 is d0 = 20 mm + 1.5 mm = 21.5 mm, the effective diameter d e of the bolt is 17.6545 mm, and the bolt material is Q460 steel.

[0042] According to the formula , the shear bearing capacity of the bolt is calculated;

[0043] Wherein, n v is the number of shear planes per bolt, is the shear strength design value of the bolt, which is 310 MPa; and

[0044] According to the formula , the pressure bearing capacity of the bolt is calculated;

[0045] Wherein, ∑t is the smaller value of the total thickness of the pressure component in different force directions; is the pressure strength design value of the bolt, which is 695 MPa; and

[0046] According to the formula , the number of bolts required for the shear resistance of the concrete slab is calculated;

[0047] Wherein, [N] is the minimum value of the pressure bearing capacity and the shear bearing capacity of the bolt, Therefore, the anti-shear bearing capacity is selected n1 = 9.1 is obtained, so that in order to meet the pressure requirements, the number of bolts is at least 10.

[0048] According to the formula The bearing capacity of each tension bolt is calculated;

[0049] Wherein, The tensile strength design value of the bolt is 500 MPa; n2 = 9.07 is obtained

[0050] According to the formula The number of bolts required to resist tension is calculated; n2 = 9.07 is obtained, so that in order to meet the tension requirements, the number of bolts is at least 10.

[0051] The 12 bolts used in this embodiment meet the above stress conditions.

[0052] According to the formula V cs = a cv f t bh The shear strength of the concrete pavement slab is calculated, wherein: a cv The shear bearing capacity coefficient on the inclined section is 0.7 for general flexural members; f t The design value of the axial tensile strength of concrete is 1.57; b is the length of the concrete slab, and h is the thickness of the concrete slab; V cs = 439600 N.

[0053] The vertical force on one side of the concrete pavement slab is 1110000 / 4 = 277500 N. Because 277.5 KN < 439.6 KN, the assembled concrete pavement slab can completely withstand the stress applied by the airplane.

Claims

1. A bolted square assembled airport pavement connection node, characterized by, The utility model relates to a kind of square assembly type airport pavement connecting nodes of bolt connection, including: Concrete pavement panel (1), cross-shaped concrete connecting plate (2) and grouting layer (4), wherein: The concrete connecting plate (2) is formed by four sides of square plate extending outwardly by same length, and the length of extension is half of the side length of square plate; The bottom surface of the concrete pavement panel (1) is provided with square boss (103), the boss (103) is embedded in the cavity surrounded by the concrete connecting plate (2) after splicing, so that the boss (103) and the concrete connecting plate (2) form continuous plane; The concrete connecting plate (2) located below and the concrete pavement panel (1) located above are connected by screw rod (3), so that the top surface of the concrete pavement panel (1) and the top surface of adjacent concrete pavement panel (1) are spliced to form continuous plane as airport pavement; The grouting layer (4) is used to fixedly connect the screw rod (3) and the concrete pavement panel (1).

2. The square assembly type airport pavement connecting nodes of bolt connection according to claim 1, wherein: A single row of upper layer screw holes (101) are equidistantly arranged on the edge of the concrete pavement panel (1), and lower layer screw holes (201) are arranged on the concrete connecting plate (2);The upper layer screw holes (101) and the lower layer screw holes (201) correspond one by one, for the screw rod (3) to pass through them and screw the corresponding concrete pavement panel (1) and concrete connecting plate (2) together.

3. The square assembly type airport pavement connecting nodes of bolt connection according to claim 2, wherein: A lower layer nut (202) is fixedly arranged at the top of the lower layer screw hole (201), and an upper layer nut (102) is fixedly arranged at the top of the upper layer screw hole (101) through the grouting layer (4); The screw rod (3), the upper layer nut (102) and the lower layer nut (202) are threadedly connected, and the diameter of the upper layer screw hole (101) is 1.5 times the diameter of the upper layer nut (102).

4. The bolted square assembled airport pavement connection node of claim 2, wherein: The upper layer screw hole (101) is arranged at each corner of the concrete pavement panel (1).

5. The bolted square assembled airport pavement connection node of claim 4, wherein: The minimum distance of the upper layer screw hole (101) from the edge is 2d0, and the minimum distance between adjacent screw holes is 3d0, d0 is the minimum allowable distance of bolt, d0=d+1.5mm, and d is the diameter of the screw rod (3).

6. The bolted square assembled airport pavement connection node of claim 4, wherein: The minimum distance of the lower layer screw hole (201) from the edge is 2d0, and the minimum distance between adjacent screw holes is 3d0, d0 is the minimum allowable distance of bolt, d0=d+1.5mm, and d is the diameter of the screw rod (3).

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