CN111088812A

CN111088812A - Trestle anchoring pier foundation structure and construction method thereof

Info

Publication number: CN111088812A
Application number: CN201911289864.9A
Authority: CN
Inventors: 梁磊磊; 徐涛; 徐财进; 张明闪; 郭恒; 孙科; 韩伦
Original assignee: CCCC SHEC Second Engineering Co Ltd
Current assignee: CCCC SHEC Second Engineering Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-05-01

Abstract

The invention provides a foundation structure of a trestle anchoring pier, which comprises: the system comprises four steel pipe piles and two auxiliary piles, wherein the four steel pipe piles are distributed in a rectangular array, the lower ends of the steel pipe piles are anchored in the ground, the tops of the left and right adjacent steel pipe piles are connected with pile top beams, and bailey main beams are erected on the pile top beams; an inclined rod and a parallel connection are arranged between the adjacent front and back steel pipe piles; the two auxiliary piles are vertically arranged on the outer sides of the left steel pipe pile and the right steel pipe pile respectively, the lower ends of the two auxiliary piles are anchored in the ground, and an inclined rod and a parallel connection are arranged between each auxiliary pile and the two steel pipe piles respectively. The invention further provides a construction method of the foundation structure of the trestle anchoring pier. According to the foundation structure of the trestle anchoring pier, the steel pipe pile and the auxiliary pile are connected from the hexagonal contact structure and are connected with the rock stratum into a whole through the anchoring system, and the foundation structure is simple and can solve the stability problem of the trestle in deep water, bare rock and a torrent area.

Description

Trestle anchoring pier foundation structure and construction method thereof

Technical Field

The invention belongs to the field of trestle foundation construction, and particularly relates to a trestle anchoring pier foundation structure and a construction method thereof.

Background

With the continuous progress of science and technology, bridge construction is developed rapidly, particularly since the twenty-first century, the bridge construction industry is developed vigorously, large-span bridges spanning inland rivers and large canyons are inexhaustible, and the development trend is continued for a long time in the future. The foundation arrangement of the trestle in the deepwater, bare rock and torrent areas is a problem which needs to be overcome all the time in the construction of the bridge in the water, and the previous foundation of the trestle in the deepwater, bare rock and torrent areas usually adopts the mode of adding the anchor rod at the bottom of the steel pipe pile to prevent the trestle from overturning. When the cantilever of the trestle steel pipe pile foundation is large, the foundation is of a flexible structure, and the trestle is greatly deformed by the traffic of engineering vehicles, the rapid stream and the like, so that the structure is safe and unfavorable.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a foundation structure of a trestle anchoring pier and a construction method thereof, which overcome the above problems or at least partially solve or alleviate the above problems.

The invention provides a foundation structure of a trestle anchoring pier, which comprises: the system comprises four steel pipe piles and two auxiliary piles, wherein the four steel pipe piles are distributed in a rectangular array, the lower end of each steel pipe pile is anchored in the ground, a pile top beam is connected between the tops of the left and right adjacent steel pipe piles, and a Bailey main beam is erected on the pile top beam; an inclined rod and a parallel connection are arranged between the front adjacent steel pipe pile and the rear adjacent steel pipe pile; the two auxiliary piles are vertically arranged on the outer sides of the left steel pipe pile and the right steel pipe pile respectively, the lower ends of the auxiliary piles are anchored in the ground, and an inclined rod and a parallel connection are arranged between each auxiliary pile and the two steel pipe piles respectively.

Preferably, each auxiliary pile is equidistant from the two adjacent steel pipe piles in a straight line.

Preferably, the two auxiliary piles are symmetrically arranged on two sides of the four steel pipe piles.

Preferably, anchor rods are arranged in the lower ports of the steel pipe pile and the auxiliary pile, the anchor rods are divided into three groups, and the three groups of anchor rods are distributed in a triangular array.

The invention provides a construction method of a foundation structure of an anchor pier of a trestle, which comprises the following steps:

s001: vibrating and sinking four steel pipe piles at the design position, and fixing a connecting frame between the adjacent steel pipe piles to form a steel pipe pile foundation;

s002: vibrating and sinking two auxiliary piles at the design position, measuring the distance between the auxiliary pile and the steel pipe pile, and fixing a connecting frame between the auxiliary pile and the steel pipe pile;

s003: cleaning silt in the four steel pipe piles and the two auxiliary piles, inserting a plurality of anchor rods into contact surfaces at the lower ports of the four steel pipe piles and the lower ends of the two auxiliary piles, and pouring concrete into the four steel pipe piles and the two auxiliary piles to cover the anchor rods;

s004: installing a pile top beam between the tops of two left and right adjacent steel pipe piles;

s005: and the front pile top beam and the rear pile top beam are provided with Bailey main beams.

In steps S001 and S002, the steel pipe pile and the auxiliary pile are vibro-sunk onto the bedrock or vibro-sunk to a depth of 1-2 m.

In step S003, if the steel pipe pile and the auxiliary pile are vibrated and sunk, if the steel pipe pile and the auxiliary pile encounter bedrock, the steel pipe pile and the auxiliary pile are directly drilled after silt in the steel pipe pile and the auxiliary pile is removed, if the steel pipe pile and the auxiliary pile are vibrated and sunk to a predetermined depth and then do not encounter bedrock, the steel pipe pile and the auxiliary pile are removed first of all, then drilling is performed, and finally grouting reinforcement is performed in the drilled holes.

In step S003, the drilling depth is 1.5-2.5m, and the anchor rod is inserted into the drilling hole, and the length of the upper end of the anchor rod exposed outside the ground is 0.8-1.3 m.

The anchor rods in the steel pipe pile and the auxiliary pile are divided into three groups, each group comprises three anchor rods, and the three anchor rods are distributed in a triangular array mode.

According to the method, the steel pipe piles and the rock stratum are anchored together by utilizing the bond stress between the anchoring concrete and the four steel pipe piles and the friction force between the anchor rods and the rock stratum, so that the stability of the trestle in a rapid flow is enhanced; meanwhile, two rows of steel pipe pile foundations and the auxiliary piles are connected into an integral hexagonal foundation structure by arranging the two auxiliary piles, so that the problem of insufficient stability of the trestle in deep water, bare rocks and torrent areas is solved, and the safety of the trestle in the area is improved; the anchor rod is utilized to realize friction type connection between the trestle foundation and the rock stratum, so that the anti-overturning stability of the trestle under the action of a rapid stream is enhanced.

Drawings

FIG. 1 is a schematic view of the foundation structure of the trestle anchoring pier of the invention;

fig. 2 is a schematic view showing a distribution structure of the steel pipe pile and the auxiliary pile in fig. 1.

In the above figures: 1, steel pipe piles; 2, auxiliary piles; 3, pile top beam; 4 bailey main beams; 5, a diagonal rod and a parallel connection; 6, anchoring the bolt; 7 concrete.

The invention will be further explained in detail with reference to the drawings and the embodiments;

Detailed Description

Example 1

Referring to fig. 1 and 2, an embodiment of a first aspect of the present invention provides a foundation structure of a trestle anchoring pier, including: the system comprises four steel pipe piles 1 and two auxiliary piles 2, wherein the four steel pipe piles 1 are distributed in a rectangular array, the lower end of each steel pipe pile 1 is anchored in the ground, a pile top beam 3 is connected between the tops of the left and right adjacent steel pipe piles 1, and a Bailey main beam 4 is erected on the pile top beam 3; an inclined rod and a parallel connection 5 are arranged between the front and the back adjacent steel pipe piles 1; two auxiliary piles 2 are vertically arranged on the outer sides of the left and right pairs of steel pipe piles 1 respectively, the lower ends of the auxiliary piles are anchored in the ground, and an inclined rod and a parallel connection 5 are arranged between each auxiliary pile 2 and the two steel pipe piles 1 respectively.

Four steel-pipe piles 1 are distributed in a rectangular array, and are fixedly welded and connected into a whole through an inclined rod and a parallel connection 5, two auxiliary piles 2 are fixedly connected into a whole through the inclined rod and the parallel connection 5 and two steel-pipe piles 1 on two sides of the four steel-pipe piles 1, a trestle foundation with a hexagonal structure is formed, the structural strength of the trestle foundation is improved, the problem that the stability of the trestle in deep water, bare rocks and an torrent area is insufficient is solved, the lower ends of each steel-pipe pile 1 and each auxiliary pile 2 are anchored in the ground, friction type connection is achieved between the trestle foundation and the rock stratum through an anchor rod 6, and the overturning resistance stability of the trestle foundation under the action of torrent is enhanced.

Example 2

Referring to fig. 2, on the basis of embodiment 1, each auxiliary pile 2 has the same straight-line distance from the two steel pipe piles 1 adjacent to it.

The lengths of the two groups of diagonal rods and the parallel connection 5, which are respectively connected with the front and the rear steel pipe piles 1, of the auxiliary pile 2 are equal, so that the front and the rear balance of the support and the traction of the two steel pipe piles 1 can be ensured.

Example 3

Referring to fig. 1 and 2, in example 2, two auxiliary piles 2 are symmetrically arranged on both sides of four steel pipe piles 1.

The distances between the two auxiliary piles 2 and the two steel pipe piles 1 adjacent to each other in the front and back of the side where the distance is from the horizontal direction are equal, so that the support and the traction of the four steel pipe piles 1 by the two auxiliary piles 2 are balanced in the left and right directions.

Example 4

Referring to fig. 2, on the basis of embodiment 1, anchor rods 6 are arranged in the lower ports of the steel pipe pile 1 and the auxiliary pile 2, the anchor rods 6 are divided into three groups, and the three groups of anchor rods 6 are distributed in a triangular array.

The quantity of 6 stock in every steel-pipe pile 1 and the auxiliary pile 2 is nine to three stock 6 is a set of, and three stock 6 of group are triangular array and distribute, and three stock 6 in every group is triangular array and distributes equally, can improve the stability of 6 anchor joints of stock.

Example 5

Referring to fig. 1 and 2, an embodiment of a second aspect of the present invention provides a method for constructing a foundation structure of a trestle anchoring pier, including the following steps: s001: vibrating and sinking four steel pipe piles 1 at the design position, and fixing an inclined rod and a parallel connection 5 between the adjacent steel pipe piles 1; s002: vibrating and sinking two auxiliary piles 2 at the design position, and fixing an inclined rod and a parallel connection 5 between the auxiliary piles 2 and the steel pipe pile 1; s003: cleaning silt in the four steel pipe piles 1 and the two auxiliary piles 2, inserting a plurality of anchor rods 6 into contact surfaces of lower ports of the four steel pipe piles 1 and lower ends of the two auxiliary piles 2, and pouring concrete 7 into the four steel pipe piles 1 and the two auxiliary piles 2 to cover the anchor rods 6; s004: a pile top beam 3 is arranged between the tops of two left and right adjacent steel pipe piles 1; s005: and the front pile top beam 3 and the rear pile top beam 3 are provided with Bailey main beams 4.

The four steel pipe piles 1 are welded, fixed and connected into a whole through the diagonal rods and the horizontal connector 5, the four steel pipe piles 1 are distributed in a rectangular array, the two auxiliary piles 2 are positioned on two sides of the travelling direction of a trestle on the steel pipe pile 1, and the two auxiliary piles 2 and the two adjacent steel pipe piles 1 are fixedly connected into a whole through the diagonal rods and the horizontal connector 5; after taking away the silt in four steel-pipe pile 1 and two auxiliary piles 2, all insert stock 6 and pour concrete 7 in the stratum in every steel-pipe pile 1 and auxiliary pile 2, steel-pipe pile 1 and auxiliary pile 2 pass through concrete 7 and stock 6 fixed connection, stock 6 is connected with the stratum looks anchor, the stability of being connected between four steel-pipe pile 1 and two auxiliary piles 2 and the stratum has been improved, guarantee that the top of four steel-pipe pile 1 is in the coplanar this moment, and connect pile back timber 3 between the top of two steel-pipe pile 1 of necklace about, can install the bailey girder 4 that is processed in advance on two pile back timber 3 in front and back.

Example 6

Referring to fig. 2, in S001 and S002, the steel pipe pile 1 and the auxiliary pile 2 are vibro-sunk onto the bedrock or vibro-sunk to a depth of 1-2 m.

The vibration sinking depth of the steel pipe pile 1 and the auxiliary pile 2 is preferably 1.5m, and the steel pipe pile 1 and the auxiliary pile 2 are ensured to be in a vertical state.

Example 7

Referring to fig. 1, in S003, if meeting the bedrock during the vibration sinking of steel-pipe pile 1 and auxiliary pile 2, directly drill after removing silt in steel-pipe pile 1 and auxiliary pile 2, if meeting no bedrock after steel-pipe pile 1 and auxiliary pile 2 vibrate and sink to the predetermined depth, remove silt in steel-pipe pile 1 and auxiliary pile 2 first, drill, and finally slip-casting and reinforcing in the drill hole.

Judging whether the drilling machine meets the bedrock according to the change of the hole-rotating pressure of the drilling machine, and if the drilling pressure is increased sharply, considering that the drilling machine meets the bedrock; if the pressure change of the drill hole is gentle, the condition that the drill hole does not meet the bedrock is judged, and cement slurry is injected into the drill hole after the drill hole is drilled to the designed depth, so that the soil layer strength and the friction force are increased.

Example 8

Referring to fig. 1, in S003, the drilling depth is 1.5 to 2.5m, the anchor 6 is inserted into the drilling, and the length of the anchor 6 left in the steel-pipe pile 1 or the auxiliary pile 2 is 0.8 to 1.3 m.

The drilling depth is preferably 2m, the length of the anchor rod 6 left in the steel pipe pile 1 or the auxiliary pile 2 is preferably 1m, and the concrete 7 is poured to cover the whole hole.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims

1. The utility model provides a landing stage anchor mound foundation structure which characterized in that includes: the steel pipe pile structure comprises four steel pipe piles (1) and two auxiliary piles (2), wherein the four steel pipe piles (1) are distributed in a rectangular array, the lower end of each steel pipe pile (1) is anchored in the ground, a pile top beam (3) is connected between the tops of the left and right adjacent steel pipe piles (1), and a Bailey main beam (4) is erected on the pile top beam (3); an inclined rod and a parallel connection (5) are arranged between the front and the back adjacent steel pipe piles (1); the two auxiliary piles (2) are vertically arranged on the outer sides of the left steel pipe pile (1) and the right steel pipe pile (1) respectively, the lower ends of the auxiliary piles are anchored in the ground, and an inclined rod and a parallel connection (5) are arranged between each auxiliary pile (2) and the two steel pipe piles (1) respectively.

2. Trestle anchoring pier foundation structure according to claim 1, characterized in that each auxiliary pile (2) is equidistant from the two steel pipe piles (1) to which it is close.

3. The foundation structure of the trestle anchoring pier of claim 2, wherein two auxiliary piles (2) are symmetrically arranged on two sides of four steel pipe piles (1).

4. The trestle anchoring pier foundation structure according to claim 1, wherein anchor rods (6) are arranged in the lower ports of the steel pipe piles (1) and the auxiliary piles (2), the anchor rods (6) are divided into three groups, and the three groups of anchor rods (6) are distributed in a triangular array.

5. A construction method of a foundation structure of an anchor pier of a trestle is characterized by comprising the following steps:

s001: four steel pipe piles (1) are vibrated and sunk at a design position, and an inclined rod and a parallel connection (5) are fixed between the adjacent steel pipe piles (1);

s002: vibrating and sinking two auxiliary piles (2) at a design position, and fixing an inclined rod and a parallel connection (5) between the auxiliary piles (2) and the steel pipe pile (1);

s003: cleaning silt in the four steel pipe piles (1) and the two auxiliary piles (2), inserting a plurality of anchor rods (6) into contact surfaces of lower ports of the four steel pipe piles (1) and lower ends of the two auxiliary piles (2), and pouring concrete (7) into the four steel pipe piles (1) and the two auxiliary piles (2) to cover the anchor rods (6);

s004: a pile top beam (3) is arranged between the tops of the two left and right adjacent steel pipe piles (1);

s005: and Bailey main beams (4) are arranged on the front pile top beam (3) and the rear pile top beam (3).

6. The trestle anchoring pier foundation structure construction method according to claim 5, wherein in S001 and S002, the steel pipe pile (1) and the auxiliary pile (2) are vibro-sunk onto bedrock or vibro-sunk to a depth of 1-2 m.

7. The trestle anchoring pier foundation structure construction method according to claim 6, wherein in S003, when the steel pipe pile (1) and the auxiliary pile (2) are vibrated and sunk, if meeting a bedrock, silt in the steel pipe pile (1) and the auxiliary pile (2) is removed, then drilling is directly performed, if the steel pipe pile (1) and the auxiliary pile (2) are vibrated and sunk to a predetermined depth and do not meet the bedrock, then the silt in the steel pipe pile (1) and the auxiliary pile (2) is removed, then drilling is performed, and finally grouting reinforcement is performed in the drilling hole.

8. The trestle anchoring pier foundation structure construction method according to claim 6, wherein in S003, the drilling depth is 1.5-2.5m, the anchor rod (6) is inserted into the drilling, and the length of the anchor rod (6) left in the steel pipe pile (1) or the auxiliary pile (2) is 0.8-1.3 m.