CN-121992730-A - Method for constructing bridge pier on middle isolation belt of existing line of busy expressway

CN121992730ACN 121992730 ACN121992730 ACN 121992730ACN-121992730-A

Abstract

A method for building bridge pier in the middle of existing line of busy highway includes such steps as measuring the area of bridge pier, building the surrounding barrier outside the area of bridge pier, digging oblique pit outside highway, digging the tunnel at the bottom of oblique pit to the center of surrounding barrier, digging foundation pit at the position of two bridge pier areas, erecting template frame at the position of pile pit, putting reinforcing cage, pouring reinforcing cage outside highway by concrete pump truck, forming concrete pile, curing, demoulding, backfilling foundation pit, backfilling tunnel, and backfilling tunnel.

Inventors

ZHANG YILEI
Meng Jingshuo
XIE LEIJIE
ZHANG GUOYUE
LI HAO
WANG GAOFENG
Niu Haoyuan
Hao Zhouxin
ZHANG DI
CHEN XIANGYANG
HE MINGANG
XU XIAOFENG
LI DONGYUAN
Zhao Likong
FAN FENGLING

Assignees

中铁七局集团郑州工程有限公司

Dates

Publication Date: 20260508
Application Date: 20260402

Claims (10)

1. A method for constructing a bridge pier on an existing line middle isolation belt of a busy expressway is characterized by comprising the following steps: Measuring the bridge pier occupation outline, namely measuring two bridge pier occupation outlines (2) which need to be built at intervals in an isolation belt (3) arranged between two expressway lanes (1) which are arranged at intervals and have opposite running directions; constructing a fence outside the occupied area profile, namely erecting a fence (4) at the outer edge part of an area formed by two bridge pier occupied area profiles (2) which are arranged at intervals in the isolation belt (3); Digging an inclined pit outside the expressway, namely digging an inclined pit (5) at a position corresponding to the middle part of the surrounding barrier (4) outside one expressway lane (1) and making side wall support; Digging a tunnel from the bottom of the inclined pit to the middle position of the enclosing baffle, namely digging a tunnel (6) from the pit bottom of the inclined pit (5) to a soil layer below the middle part of the enclosing baffle (4) in a horizontal mode and making side wall supports; digging a foundation pit upwards at the end part of the tunnel positioned right below the enclosure, namely digging an inclined channel obliquely upwards at the end part of the tunnel (6) until an outlet positioned in the enclosure (4) is dug out and supporting is performed timely, gradually digging out the foundation pit (7) which is flat with the bottom of the tunnel (6) and the outer edge of which is slightly smaller than the enclosure (4) at the outlet positioned in the enclosure (4), and performing side wall supporting; Digging pile pits downwards at the positions of the two bridge pier occupation outlines at the bottom of the foundation pit, namely digging pile pits (8) with required depth at the bottom of the foundation pit (7) below the two bridge pier occupation outlines (2) downwards manually and respectively, and making side wall support; step seven, erecting a template support at the pile pit mouth part, namely erecting a template support (9) at the mouth parts of two pile pits (8) respectively to the required height; Step eight, casting reinforcement cages in the formwork support, namely manufacturing two reinforcement cages (10) with required lengths, temporarily closing one side of the expressway lane (1), hoisting the two reinforcement cages (10) by using a crane, casting the two reinforcement cages into the two formwork support (9) along the tops of the two formwork support (9), and opening the closed one side of the expressway lane (1) after casting is completed; Step nine, pouring the reinforcement cage outside the expressway by using a concrete pump truck, namely, driving the concrete pump truck (11) to the outside of a expressway lane (1) at one side, moving a pump head to the top of the reinforcement cage (10), and pouring concrete to the top of the reinforcement cage (10) until the interior of the template bracket (9) is fully poured; Step ten, forming concrete piles after pouring the reinforcement cages, and curing, namely forming two concrete piers (12) after drying and curing the two reinforcement cages (10) poured with concrete; removing the formwork, namely removing the formwork support (9) around the outer parts of the two concrete piers (12); Backfilling the foundation pit by manually backfilling soil (13) in the foundation pit (7), so that the backfilling soil (13) wraps the positions of the two concrete piers (12) in the foundation pit (7); Step thirteen, backfilling the tunnel, namely manually backfilling the tunnel (6) and the inclined pit (5) with backfill soil (13); Fourteen steps are that the surrounding block is removed and restored, namely after backfilling (13) is basically completed on the foundation pit (7), the tunnel (6) and the inclined pit (5) by the backfilling (13), the surrounding block (4) erected in the isolation belt (3) is removed, and the foundation pit (7) is leveled and then the original green planting is restored.
2. The method for constructing bridge piers with the median strip of the existing line of the busy highway according to claim 1, wherein in the first step, each bridge pier occupation contour (2) has a length of 2m and a width of 1.2m, and the distance between the two bridge pier occupation contours (2) is 5.6 m.
3. The method for constructing bridge piers with the median strip of the existing line of the busy highway according to claim 1, wherein in the second step, the length of the surrounding area of the surrounding block (4) is 12 m, the width is 2.6 m, and the height of the surrounding block (4) is 2.5 m.
4. The method for constructing bridge piers in the middle of the existing line of a busy highway according to claim 1, wherein in the third step, the digging position of the inclined pit (5) is limited by a laser range finder, the depth of the pit bottom of the inclined pit (5) is 5 meters, the width is 2 meters, and the gradient of the inclined pit (5) is 20 degrees.
5. The method for constructing bridge piers with the median strip of the existing line of the busy highway according to claim 1, wherein the method for excavating the tunnel (6) in the fourth step is a shallow buried excavation method, and the height of the tunnel (6) is 2.2 m and the width thereof is 2 m.
6. The method for constructing a bridge pier in the middle of an existing line of a busy highway according to claim 1, wherein the foundation pit (7) in the fifth step has a depth of 5 m, a length of 11 m and a width of 2.4 m.
7. The method for constructing the bridge pier by using the median strip of the existing line of the busy highway according to claim 1, wherein the depth of each of the two pile pits (8) in the sixth step is 5 m.
8. The method for constructing the bridge pier on the existing line middle isolation belt of the busy highway according to claim 1, wherein the height of the template support (9) in the seventh step is 15m, and connecting mounting holes are formed in the side wall of the template support (9) which is 5m away from the bottom of the template support (9).
9. The method for constructing the bridge pier on the middle isolation belt of the existing line of the busy highway according to claim 1, wherein in the eighth step, each reinforcement cage (10) is divided into two parts with the length of 10 meters respectively, the bottom of each half reinforcement cage straight reinforcement of the upper half part is provided with an external thread A, the top of each half reinforcement cage straight reinforcement of the lower half part is provided with an external thread B, the directions of the external threads A and the external threads B are opposite, the half reinforcement cage of the lower half part is firstly hung in along the top of the template support (9), then the half reinforcement cage of the upper half part is hung in along the top of the template support (9), the half reinforcement cages of the two half parts are connected by screw connection sleeves with screw holes with opposite directions at the connecting installation holes by screw connection holes at the upper end and the lower end, and after the half reinforcement cages of the two half parts are connected, the connecting installation holes are closed.
10. The method for constructing bridge piers in the middle of the existing line of the busy highway according to claim 1, wherein the backfilling method of the foundation pit (7) in the steps twelve to fourteen is to fill the foundation pit (7) into a slope shape which is arranged oppositely by using backfill soil (13), the slope top of the slope is positioned outside the foundation pit (7) and depends on the inner edge of the surrounding block (4) to use the surrounding block (4) as a support, then backfilling the tunnel (6) and the inclined pit (5), and then filling the redundant backfill soil (13) positioned outside the foundation pit (7) into the foundation pit (7) in a layered manner in the foundation pit (7).

Description

Method for constructing bridge pier on middle isolation belt of existing line of busy expressway Technical Field The invention relates to a pier manufacturing process, in particular to a method for building a pier on an existing line middle isolation belt of a busy highway. Background According to the requirements of traffic development, structures such as roads and bridges are required to be newly planned and built on the existing road network, because the roads and railways are generally continuous, when the existing common roads are met, new roads can be combined or crossed with the existing common roads, when the existing common roads are met or the highways are met, the new common roads can only be selectively penetrated down or erected on the highways, when the bridges are selected to be built on the expressways, a plurality of bridge piers are required to be built at intervals to support the bridges on the upper bridges, the bridge piers of the high-speed bridge are required to be built by means of the middle isolation of the expressways due to the overlarge whole width of the expressways, the bridge piers mainly consist of top caps and pier bodies, the top caps are used for dispersing and symmetrically transmitting larger concentrated forces transmitted by bridge span supports to the pier bodies and the pier bodies, the bridge piers are generally solid structures of concrete or stone blocks, and pier bodies are provided with pier caps and foundation bases. The traditional method for constructing the bridge pier of the cross-highway bridge by using the isolation belt in the middle of the highway generally comprises the steps of enclosing the isolation belt at the position where the bridge pier needs to be constructed, constructing the isolation belt in the enclosing block, wherein the isolation belt width of the highway is generally 2.5-3 meters, the width of the bridge pier of the cross-highway bridge is generally 1.2 meters, the influence on the highway is small after the construction is finished, but the bridge pier of the cross-highway bridge needs to be excavated, reinforcement cages are put into the pile holes in the later stage and concrete casting is carried out, the engineering vehicle is needed to assist and a large number of personnel are needed to operate, the transverse width of the enclosing block at the position where the bridge pier needs to be constructed is generally 10 meters, the length of the bridge pier needs to be 10 meters, the space of the enclosing block is required to occupy the road surface of the highway which normally runs, the road surface of the enclosing block is suddenly narrowed, the highway is easily caused to be blocked by the highway due to the sudden narrowing of a worker when the highway is constructed, and the safety hazard is greatly caused by the fact that the bridge pier needs to be enclosed at any time. Disclosure of Invention In order to overcome the defects in the background technology, the invention discloses a method for building a bridge pier on the middle isolation belt of the existing line of a busy expressway, which is characterized in that a tunnel which can be penetrated through the isolation belt of the bridge pier to be built is dug outside an expressway lane, and materials which need to build the bridge pier are transported along the tunnel, so that the defect that the normal driving lane of the expressway is blocked and the driving safety is endangered because the normal driving lane of the expressway is occupied when the bridge pier is built by the isolation belt between the two-way lanes of the expressway is overcome. In order to achieve the aim of the invention, the invention adopts the following technical scheme: A method for constructing a bridge pier on an existing line middle isolation belt of a busy expressway comprises the following steps: Measuring the bridge pier occupation outline, namely measuring two bridge pier occupation outlines needing to be built at intervals in an isolation zone arranged between two expressway lanes which are arranged at intervals and have opposite running directions; Constructing a fence outside the occupied area, namely erecting the fence at the outer edge part of the bridge pier occupied area forming area which is arranged in the isolation belt at intervals; digging an inclined pit outside the expressway, namely digging the inclined pit at a position corresponding to the outer part of one expressway lane and the middle part of the enclosure, and making side wall support; Digging a tunnel from the bottom of the inclined pit to the middle position of the enclosing baffle, namely digging the tunnel from the pit bottom of the inclined pit to the soil layer below the middle part of the enclosing baffle in a horizontal mode and making side wall supports; digging a foundation pit upwards at the end part of the tunnel positioned right below the enclosure, namely digging an inclined channel obliquely upwards at