CN-121992696-A - Continuous reinforced concrete composite pavement and tunnel pavement connection structure and construction method

CN121992696ACN 121992696 ACN121992696 ACN 121992696ACN-121992696-A

Abstract

The invention discloses a continuous reinforcement concrete composite pavement and tunnel pavement connecting structure, which comprises a telescopic rigid joint cover plate, a shear force transmission assembly, a longitudinal connecting assembly and a high-flexibility high-toughness joint insertion plate, wherein the high-flexibility high-toughness joint insertion plate is arranged in a connecting joint between a CRC plate and a tunnel pavement cement concrete slab, the shear force transmission assembly comprises a plurality of smooth round shear steel bars penetrating through the joint insertion plate, the longitudinal connecting assembly comprises continuous longitudinal steel bars extending from a steel bar net of the CRC plate and penetrating through the joint insertion plate, and the telescopic rigid joint cover plate covers the connecting joint and is respectively fixed on the surfaces of the CRC plate and the tunnel pavement cement concrete slab. According to the invention, the hidden connecting seam and the telescopic rigid cover seam plate are adopted, and the end connecting structure is arranged below the AC layer, so that the risk of reflection cracking of the AC layer caused by stress concentration at the connecting seam is eliminated, the travelling comfort and safety are effectively improved, and adverse effects of moisture invasion on the end structure and the pavement structure are avoided.

Inventors

LI SHENG
WANG MIAO
XIANG BIN
ZHENG SHUO
HUANG QINGCHUN
Peng Chenbin
SUN YU

Assignees

长沙理工大学

Dates

Publication Date: 20260508
Application Date: 20260130

Claims (10)

1. Continuous reinforcement concrete combined type road surface and tunnel road surface connection structure sets up between CRC board (2) and tunnel road surface cement concrete slab (3) on short-circuit base tunnel slag particle layer (1), its characterized in that includes: the high-flexibility high-toughness joint inserting plate (4) is arranged in a connecting joint between the CRC plate (2) and the tunnel pavement cement concrete slab (3), and the thickness of the high-flexibility high-toughness joint inserting plate is equal to the design width of the connecting joint; The shear force transmission assembly (5) comprises a plurality of smooth round shear steel bars (501) penetrating through the joint insertion plate, one end of each smooth round shear steel bar (501) is anchored in the CRC plate (2), and the other end of each smooth round shear steel bar is inserted into a sleeve (502) at a corresponding position in the tunnel pavement cement concrete plate (3); -a longitudinal connection assembly (6) comprising a continuous longitudinal bar (601) extending from the reinforcement mesh of the CRC plate (2) and passing through the slot plate, the extended ends of the continuous longitudinal bar (601) being inserted into bushings (502) at corresponding positions in the tunnel pavement cement concrete slab (3); a telescopic rigid cover seam plate (7) which covers the upper part of the connecting seam and is respectively fixed on the surfaces of the CRC plate (2) and the tunnel pavement cement concrete slab (3), and the upper surfaces of the telescopic rigid cover seam plate are flush with the surfaces of the concrete slabs at the two sides and are used for closing the top opening of the connecting seam; the end of the sleeve (502) is provided with a sealing piece, and the inner diameter of the sleeve (502) is larger than the diameter of the sleeved reinforcing steel bars, so that a gap allowing the reinforcing steel bars to axially slide is formed.
2. The continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 1, wherein the telescopic rigid cover seam plate (7) comprises two symmetrically arranged fixed telescopic plates (701) and a movable load bearing plate (702), the two fixed telescopic plates (701) are respectively fixed on the CRC plate (2) and the tunnel pavement cement concrete slab (3) through anchor bolts, guide blocks (703) which are arranged in a tooth shape are formed on two sides of the movable load bearing plate (702) in a protruding mode, the guide blocks are respectively in inserted sliding fit with guide grooves (704) on the two fixed telescopic plates (701), high-elastic high-toughness rubber strips (705) are fixedly arranged on each fixed telescopic plate (701), the high-elastic high-toughness rubber strips (705) are matched and installed in corresponding slots (706) on the movable load bearing plate (702) in a sliding insertion mode, and the tops of the high-elastic high-toughness rubber strips (705) are tightly attached to the bottoms of the guide blocks (703).
3. The continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 1 or 2, wherein a gap is reserved between the end of the longitudinal reinforcement extension portion and the end of the smooth round shear bar (501) and the sleeve (502) closure to fill the buffer material.
4. The continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 1 or 2, wherein the end portion of the CRC plate (2) extends in the tunnel direction and is lap-supported on the lean concrete leveling layer (8) of the tunnel pavement.
5. The continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 1 or 2 is characterized in that an asphalt concrete AC layer is continuously paved above the CRC board (2) and the tunnel pavement cement concrete slab (3) and covers the telescopic rigid joint board (7), and the asphalt concrete AC layer is of a multi-layer structure and comprises an SMA-13 surface layer (9), a modified AC-20 middle layer (10) and a modified asphalt synchronous macadam bottom layer.
6. A construction method of the continuous reinforced concrete composite pavement and tunnel pavement connection structure according to any one of claims 1 to 5, characterized by comprising the following steps: S1, determining the width of a connecting seam, namely calculating the length of an end sliding region of the CRC plate (2) and the displacement of the end during construction according to the annual maximum temperature difference of the region where the project is located, the structural parameters of the CRC plate (2) and the reduction effect of the thickness of an AC layer on the temperature gradient change in the pavement structure, and determining the design width of the connecting seam to be 1.5-2 times of the displacement of the end during construction; S2, foundation construction, namely constructing a lean concrete leveling layer (8) in a tunnel pavement, finishing construction and acceptance of a slag particle layer (1) of the tunnel, and extending the end part of a CRC plate (2) to one side of the tunnel pavement; S3, installing a joint inserting plate and reinforcing steel bars, namely arranging a high-flexibility high-toughness joint inserting plate (4) with corresponding reserved holes at the joint positions, respectively inserting both ends of a smooth round shear steel bar (501) into a tunnel pavement cement concrete slab (3) and a CRC (cyclic redundancy check) plate (2) after penetrating through the joint inserting plate, extending continuous longitudinal steel bars (601) in the CRC (2) to one side of a tunnel pavement, inserting the continuous longitudinal steel bars into the tunnel pavement cement concrete slab (3) after penetrating through corresponding reserved holes on the joint inserting plate, and sleeving a sleeve (502) outside the part of each steel bar in the tunnel pavement cement concrete slab (3) according to requirements; s4, pouring concrete, namely pouring a tunnel pavement cement concrete slab (3) and a short-circuit bed CRC board (2); S5, installing a joint cover plate, namely grooving the concrete surfaces at two sides of the top of the joint, and installing a telescopic rigid joint cover plate (7) so that the upper surface of the telescopic rigid joint cover plate is flush with the surfaces of the CRC plate (2) and the tunnel pavement cement concrete slab (3); and S6, constructing an asphalt concrete AC layer according to design requirements.
7. The construction method of the continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 6, wherein the specific determination process of the end displacement during the construction of the CRC plate is as follows: Step S11, determining the surface layer type and thickness, the CRC board width b 1 , the hard shoulder width b 2 , the longitudinal continuous reinforcement arrangement rate and the CRC board length L according to design data; Step S12, checking design data or historical weather data of the region, and determining a maximum annual temperature difference DeltaT max of the region where the project is located, wherein as the AC layer is arranged above the CRC plate, the temperature gradient in the CRC plate is reduced, the temperature change DeltaT at the end part of the CRC plate is calculated according to the maximum annual temperature difference DeltaT max of the region where the project is located multiplied by the reduction coefficient of the AC layer to the temperature change DeltaT at the end part of the CRC plate, and the reduction coefficient is determined according to the thickness of the AC layer and the following table; ; Step S13, determining key parameters required by CRC plate end displacement calculation according to indoor test or existing research data, wherein the key parameters comprise the elastic modulus E c of cement concrete, the linear expansion coefficient alpha c of cement concrete, the elastic modulus E s of steel bars, the linear expansion coefficient alpha s of steel bars, the concrete weight gamma c , the concrete weight gamma s , the longitudinal reinforcement rate rho, and the friction coefficient f of a CRC plate and a slag discharging granular material layer; step S14, determining delta T' according to the difference between the highest air temperature average value of 6 months in the previous three years and the lowest air temperature average value of the planned construction month in the previous three years after the construction season is preliminarily determined according to the construction progress plan; Step S15, calculating and determining the end displacement u during construction of the CRC board of the short-circuit foundation according to the following formula: (C1); (C2); (C3); (C4); (C5); Wherein: L 1 -limit length of CRC plate sliding region; L 0 -the actual length of the CRC plate sliding region; E 1 -elastic modulus of CRC slab concrete; E c -the elastic modulus of the cement concrete; e s , the elastic modulus of the steel bar; gamma-CRC plate bulk density; gamma c —cement concrete weight; Gamma s -the weight of the steel bar; ρ—reinforcement ratio; f-coefficient of friction; The temperature expansion coefficient of the α -CRC plate; delta T-CRC plate end temperature variation; b 1 —CRC panel width; b 2 —hard shoulder width; the end displacement during construction of the u-CRC board; When the calculated L 1 is more than or equal to 1/2.L, L 0 =1/2.L, otherwise L 0 =L 1 .
8. The construction method of the continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 7, wherein the installation of the plain round shear steel bars also meets the following requirements: The plain round shear steel bar is vertical to the plane of the slot inserting plate when being installed, and the 1/2 length position of the plain round shear steel bar is aligned with the position of the connecting slot; The sleeve opening at one end far away from the slot inserting plate is closed by a sleeve cap, and a gap with the length not less than 30mm is reserved at the end and filled with buffer materials such as yarn heads; The length of the outer sleeve of the smooth round shear steel bar is not less than 100mm, and the inner diameter of the sleeve is 2-4mm larger than the diameter of the smooth round shear steel bar.
9. The construction method of the continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 7, characterized in that the extension of the continuous longitudinal steel bars meets the following requirements: the continuous longitudinal steel bars are extended when the steel bar net in the CRC plate is bound and constructed to the tunnel pavement end, and form a whole with the steel bar net in the CRC plate; The length of the continuous longitudinal steel bar passing through the slot inserting plate is not less than 1/2 of the length of the smooth round shearing steel bar plus 30cm; the continuous longitudinal steel bars are kept vertical to the plane of the slot inserting plate when being prolonged; The continuous longitudinal steel bar outer sleeve is characterized in that the extending and extending parts of the continuous longitudinal steel bars are sleeved in the continuous longitudinal steel bar outer sleeve, one end of the sleeve close to the slot inserting plate is tightly attached to the slot inserting plate, the opening of the sleeve at one end far away from the slot inserting plate is sealed by using a pipe cap, and a gap with the length not less than 30mm is reserved in the sleeve to be filled with buffer materials such as yarn heads; The inner diameter of the sleeve is 2-4mm larger than the diameter of the continuous longitudinal steel bar.
10. The construction method of the continuous reinforced concrete composite pavement and tunnel pavement connection structure according to claim 7, characterized in that after the movable loading plate and the connection joint are placed in a centering manner, the fixed expansion plate is installed, the expansion width of toothed expansion belts on two sides of the movable loading plate is 1/2 of the width of the connection joint, and hot asphalt with the thickness of 3-5mm is sprayed on the expansion rigid joint plate and in a wide area with the width of not less than 20cm nearby.

Description

Continuous reinforced concrete composite pavement and tunnel pavement connection structure and construction method Technical Field The invention belongs to the technical field of road engineering, and particularly relates to a continuous reinforced concrete composite pavement and tunnel pavement connection structure and a construction method. Background In mountain highway construction, the high bridge-to-tunnel ratio results in a large number of short-circuit base sections between tunnels. The continuous reinforced concrete and asphalt concrete composite road surface (continuous reinforced concrete composite road surface) is suitable for short-road sections due to the advantages of long service life, high bearing capacity and the like. However, the end connection between the CRC plate and the rigid tunnel pavement becomes a technical difficulty. The traditional connection mode mainly comprises two modes, namely adopting expansion joint connection, easily causing reflection cracks of an upper asphalt layer or needing to be exposed to influence travelling comfort and water resistance, and adopting ground beam anchoring, thus being complex in construction, high in cost and uneconomical in a short-circuit base section. The prior art is difficult to ensure structural durability and travelling comfort and simultaneously consider construction convenience and economy. Therefore, there is an urgent need to develop a novel end connection structure to solve the above problems. The invention mainly aims to provide a continuous reinforced concrete composite pavement and tunnel pavement connection structure and a construction method, which aim to at least solve one of the problems in the background technology. Therefore, the continuous reinforced concrete composite pavement and tunnel pavement connection structure provided by the invention is arranged between a CRC plate on a slag particle layer of a short-circuit base tunnel and a tunnel pavement cement concrete slab, and comprises the following components: the high-flexibility high-toughness joint inserting plate is arranged in a connecting joint between the CRC plate and the tunnel pavement cement concrete slab, and the thickness of the joint is equal to the design width of the connecting joint; the shearing force transmission assembly comprises a plurality of smooth round shearing force steel bars penetrating through the joint insertion plate, one ends of the smooth round shearing force steel bars are anchored in the CRC plate, and the other ends of the smooth round shearing force steel bars are inserted into sleeves at corresponding positions in the tunnel pavement cement concrete slab; A longitudinal connection assembly including continuous longitudinal bars extending from the mesh reinforcement of the CRC plate and passing through the slot insertion plate, the extended ends of the continuous longitudinal bars being inserted into bushings at corresponding locations in the tunnel pavement cement concrete slab; The telescopic rigid cover seam plate is covered above the connecting seam and is respectively fixed on the surfaces of the CRC plate and the tunnel pavement cement concrete slab, and the upper surfaces of the telescopic rigid cover seam plate are flush with the surfaces of the concrete slabs on two sides and are used for closing the top opening of the connecting seam; the end of the sleeve is provided with a sealing piece, and the inner diameter of the sleeve is larger than the diameter of the sleeved reinforcing steel bar, so that a gap allowing the reinforcing steel bar to axially slide is formed. Specifically, scalable rigidity cover seam board includes the fixed expansion plate and a movable load board that two symmetries set up, two fixed expansion plate pass through anchor bolt respectively be fixed in CRC board with tunnel road surface cement concrete slab, the both sides evagination of movable load board is formed with the guide block of tooth form arrangement, respectively with two guide slot grafting sliding fit on the fixed expansion plate, every fixed expansion plate is last to be fixed and is equipped with high-elastic high-toughness rubber strip, high-elastic high-toughness rubber strip matches the slip grafting and installs in the slot that corresponds on the movable load board, the top of high-elastic high-toughness rubber strip with the bottom of guide block is pasted tightly. Specifically, the end of the sleeve is provided with a sealing piece, and gaps are reserved between the end of the continuous longitudinal reinforcing steel bar extension part and the end of the smooth round shearing reinforcing steel bar and the sealing piece of the sleeve for filling with buffer materials such as yarn heads. Specifically, the end portion of the CRC plate extends in the tunnel direction and is lap-supported on the lean concrete leveling layer of the tunnel pavement. Specifically, an asphalt concrete AC layer is continuously paved above the CRC plate a