CN215925474U

CN215925474U - Pile plate roadbed structure of underpass railway bridge highway

Info

Publication number: CN215925474U
Application number: CN202121578364.XU
Authority: CN
Inventors: 杜晓宇; 于洪国; 常瑞祥; 赵志强; 扎拉; 扎西; 普珠
Original assignee: Road and Bridge International Co Ltd; China Communication North Road and Bridge Co Ltd
Current assignee: Road and Bridge International Co Ltd; China Communication North Road and Bridge Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-03-01
Anticipated expiration: 2031-07-12

Abstract

The utility model provides a pile plate roadbed structure of a highway with a underpass railway bridge, wherein a group of concrete cast-in-place piles are arranged below the railway bridge and at two sides of the railway bridge along the longitudinal direction of the highway at certain intervals, each group of concrete cast-in-place piles is at a certain distance from the foundation of the railway bridge, the top of each group of concrete cast-in-place piles is provided with a continuous concrete beam plate along the longitudinal direction of the highway, the beam plate and the top of the concrete cast-in-place piles are cast into a whole, and the bottom surfaces of two sides of the beam plate are at a certain height from the top surface of the foundation of the railway bridge. The pile plate type continuous rigid frame structure is arranged at a certain distance from the railway pier foundation, so that the pressure is not increased on the railway pier foundation, the influence on the sedimentation deformation of the existing structure is almost zero, and the operation safety of the railway bridge can be ensured; the roadbed structure is low in height, and effective clearance from the road surface to the bottom of a railway bridge can be guaranteed to meet the operation requirement.

Description

Pile plate roadbed structure of underpass railway bridge highway

Technical Field

The utility model belongs to the technical field of highway construction, and relates to a pile plate roadbed structure for reducing disturbance to a railway bridge when a highway with a railway bridge passing through is constructed.

Background

Under wear existing railway bridge's highway construction, when the railway bridge span is less, then highway subgrade can be nearer apart from railway pier or pier basis, if adopt ordinary fill subgrade form, when construction and later stage operation, subgrade load stack can reduce the railway bridge basis and bear redundant value, produces the disturbance to the railway bridge structure, increases the risk that structural deformation and unstability. If the allowable bearing capacity of a base of a 3# pier of a certain railway bridge is 900kPa, the designed base compressive stress is 814kPa, and the base bearing capacity redundancy value is 10.6%; if a filling roadbed is adopted, the increased stress p of the foundation is calculated to be 30.8kPa, the redundant value of the bearing capacity of the original foundation is reduced to 6.5%, the safety reserve is greatly reduced, and the initial risk level of the unstable junction deformation is considered to be high by the safety risk assessment, so that the risk is not expected.

If the highway adopts a large-span bridge structure to pass through the railway bridge, the problem is that the effective clear height from the bridge deck to the bottom of the railway bridge is reduced because the bridge has a certain height, which is not beneficial to highway operation; secondly, because the bridge span is large, longer and bigger pile foundations need to be adopted, and large-scale equipment is not suitable to be used due to the proximity of railways in the construction process, so that the construction difficulty is large, and the construction cost is greatly increased.

Disclosure of Invention

The utility model aims to provide a pile plate roadbed structure of a lower-passing railway bridge highway, aiming at the problems in the construction of the lower-passing railway bridge highway, so that the disturbance of the existing railway bridge is reduced to the minimum, the normal operation of the highway is ensured, and the construction cost is reduced.

The technical scheme of the utility model is as follows:

the utility model provides a wear pile board roadbed structure of railway bridge highway down which characterized in that: a group of concrete cast-in-place piles are arranged below the railway bridge and on two sides of the railway bridge along the longitudinal direction of the road at intervals, each group of concrete cast-in-place piles is at a certain distance from the foundation of the railway bridge, continuous concrete beam plates are longitudinally arranged on the tops of the concrete cast-in-place piles along the road, the beam plates and the tops of the concrete cast-in-place piles are poured into a whole, and bottom surfaces of two sides of each beam plate are at a certain height from the top surface of the foundation of the railway bridge.

Compared with a roadbed filling mode and a bridge structure thereof, the utility model has the following advantages:

1. the roadbed adopts a pile plate type continuous rigid frame structure, has a certain distance with the railway pier foundation, does not increase pressure on the railway pier foundation, almost has zero influence on the sedimentation deformation of the existing structure, and can ensure the operation safety of the railway bridge;

2. the pile foundation construction adopts manual hole digging piles, large-scale mechanical equipment is avoided, and the risk of damaging the existing railway structure in the construction process is reduced;

3. the roadbed structure is low in height, and effective clearance from the road surface to the bottom of a railway bridge can be guaranteed to meet the operation requirement.

Drawings

FIG. 1 is a transverse elevational view of the subgrade of the present invention;

fig. 2 is a longitudinal elevational view of the subgrade of the present invention;

fig. 3 is a schematic view of a pile arrangement structure of a roadbed.

Detailed Description

As shown in fig. 1, 2 and 3, the pile slab roadbed structure of the underpass railway bridge road provided by the utility model comprises a group of cast-in-place concrete piles 2 which are arranged below a railway bridge 1 and at two sides of the railway bridge at certain intervals along the longitudinal direction of the road, each group of cast-in-place concrete piles is at a certain distance from a railway bridge foundation 3, the top of each group of cast-in-place concrete piles is provided with a continuous concrete beam slab 4 along the longitudinal direction of the road, the beam slab and the top of the cast-in-place concrete piles are cast into a whole, and the bottom surfaces of two sides of the beam slab 4 are at a certain height from the top surface of the railway bridge foundation 3.

As a specific implementation mode of the utility model, 7 concrete pouring piles are arranged in a quincuncial pile form in each group of 1 concrete pouring pile below the railway bridge, wherein the number of the concrete pouring piles is 1 in the middle, and the number of the concrete pouring piles is 6 in the circumferential direction; each group of concrete cast-in-place piles 1 positioned on two sides of the railway bridge are provided with 3 piles which are arranged in a row along the transverse direction of the road; the diameter of each pile is not more than 1.2 m; the distance between two adjacent pile groups is not more than 5 m.

In order to ensure that the two ends of the beam slab are smoothly connected with the common filling roadbed, the two ends of the beam slab can respectively extend a lapping plate 5 with a certain length along the longitudinal direction of the roadbed, the thickness of the lapping plate is smaller than that of the beam slab, and the top surface of the lapping plate is flush with the top surface of the beam slab.

In order to ensure that the beam plates are not in contact with the railway bridge roadbed, reduce the height of the beam plates as much as possible and ensure the net height of the pile plate roadbed, the thicknesses of two sides of the beam plates can be set to be smaller than the thickness of the middle of the beam plates. As a specific embodiment, the thickness of both sides of the beam plate may be set to 0.9m and the thickness of the middle may be set to 1.5 m.

In order to reduce the disturbance of the cast-in-place concrete piles to the railway bridge during the construction process and the highway operation period as much as possible, the distance between each group of cast-in-place concrete piles and the foundation of the railway bridge is not less than 4.8 m.

The distance between the bottom surfaces of the two sides of the beam slab and the top surface of the railway bridge foundation is not less than 0.3m, so that the templates can be conveniently installed during the construction of the beam slab.

The pile plate roadbed structure of the underpass railway bridge highway comprises the following concrete construction methods:

(1) constructing a group of concrete cast-in-place piles at intervals along the longitudinal direction of a highway, below a railway bridge and on two sides of the railway bridge, wherein the distance between each group of concrete cast-in-place piles and the foundation of the railway bridge is not less than 4.8m, 7 concrete cast-in-place piles are arranged below the railway bridge in a quincuncial pile form, 1 concrete cast-in-place pile is arranged in the middle, and 6 concrete cast-in-place piles are arranged in the circumferential direction; each group of concrete cast-in-place piles at two sides of the railway bridge are 3, and are transversely arranged in a row along the highway; the diameter of each pile is not more than 1.2 m; the distance between two adjacent groups of piles is not more than 5 m; the concrete filling pile adopts manual hole digging and adopts a hole-separating jumping digging method for construction according to the symmetry principle;

(2) after the construction of each group of concrete cast-in-place piles is completed, chiseling pile heads, excavating earthwork to a designed elevation, paving and tamping a broken stone cushion layer, and pouring a concrete cushion layer on the broken stone cushion layer;

(3) pouring concrete beam plates on the concrete cushion layers of the pile tops according to the design width of the roadbed; the beam slab is of a continuous structure, the thickness of the beam slab is 90cm, and the pile top part is thickened to 1.5 m; the distance between the bottom surfaces of the two sides of the beam plate and the top surface of the railway bridge foundation is not less than 0.3 m;

(4) and (5) concrete guardrails are poured on two sides of the beam slab to complete the construction of the pile slab roadbed.

During the bored concrete pile construction, for preventing disturbance railway bridge foundation, can carry out physics to railway bridge foundation and keep apart, keep apart the mode and adopt the rail pile, the rail pile sets up between railway bridge foundation and bored concrete pile to ensure that distance railway bridge foundation is no less than 1 m.

In order to ensure the construction safety, the settlement monitoring can be carried out on the railway bridge in the pile plate roadbed construction process; the settlement observation datum point is arranged at a position 30-50 m away from a construction point, the number of the settlement observation datum points is not less than 3, and the settlement observation datum point is poured on a concrete foundation by adopting a reinforcing steel bar with the length of 12cm and the diameter of 10 mm; 12 settlement monitoring points are arranged on each railway bridge pier column and are respectively arranged on the front, the rear, the left and the right sides of the upper middle part and the lower middle part of the pier column.

Claims

1. The utility model provides a wear pile board roadbed structure of railway bridge highway down which characterized in that: a group of concrete cast-in-place piles are arranged below the railway bridge and on two sides of the railway bridge along the longitudinal direction of the road at intervals, each group of concrete cast-in-place piles is at a certain distance from the foundation of the railway bridge, continuous concrete beam plates are longitudinally arranged on the tops of the concrete cast-in-place piles along the road, the beam plates and the tops of the concrete cast-in-place piles are poured into a whole, and bottom surfaces of two sides of each beam plate are at a certain height from the top surface of the foundation of the railway bridge.

2. The pile-slab roadbed structure of the underpass railway bridge and road of claim 1, wherein: each group of concrete cast-in-place piles positioned below the railway bridge are 7, are distributed in a quincuncial pile form, have 1 in the middle and have 6 in the circumferential direction; each group of concrete cast-in-place piles at two sides of the railway bridge are 3, and are transversely arranged in a row along the highway; the diameter of each pile is not more than 1.2 m; the distance between two adjacent pile groups is not more than 5 m.

3. The pile-slab roadbed structure of the underpass railway bridge and road of claim 1, wherein: the two ends of the beam plate respectively extend out of the lapping plates with certain lengths along the longitudinal direction of the roadbed, the thickness of the lapping plates is smaller than that of the beam plate, and the top surface of the lapping plates is flush with the top surface of the beam plate.

4. The pile-slab roadbed structure of the underpass railway bridge and road of claim 1, wherein: the thickness of the two sides of the beam plate is smaller than that of the middle of the beam plate.

5. The pile-slab roadbed structure of the underpass railway bridge and road of claim 4, wherein: the thickness of the two sides of the beam plate is 0.9m, and the thickness of the middle of the beam plate is 1.5 m.

6. The pile-slab roadbed structure of the underpass railway bridge and road of claim 1, wherein: the distance between each group of concrete cast-in-place piles and the foundation of the railway bridge is not less than 4.8 m.

7. The pile-slab roadbed structure of the underpass railway bridge and road of claim 1, wherein: the distance between the bottom surfaces of the two sides of the beam plate and the top surface of the railway bridge foundation is not less than 0.3 m.