A trestle anchor pier foundation structure and construction method thereof

Abstract

The present invention proposes a foundation structure for a trestle anchor pier, comprising: four steel pipe piles and two auxiliary piles, the four steel pipe piles are distributed in a rectangular array, the lower ends of the steel pipe piles are anchored in the stratum, the tops of the left and right adjacent steel pipe piles are connected with pile top beams, and the pile top beams are provided with Bailey main beams; diagonal rods and parallel joints are provided between the front and rear adjacent steel pipe piles; two auxiliary piles are vertically arranged on the outer sides of the left and right pairs of steel pipe piles, respectively, and the lower ends thereof are anchored in the stratum, and diagonal rods and parallel joints are provided between each auxiliary pile and the two steel pipe piles. The present invention also proposes a construction method for a foundation structure for a trestle anchor pier. The foundation structure for the trestle anchor pier of the present invention connects the steel pipe piles and the auxiliary piles from a hexagonal contact structure, and is connected to the rock stratum as a whole through an anchoring system. Although the structure is simple, it can solve the stability problem of the trestle in deep water, bare rock, and rapids areas.

Description

Technical Field

[0001] The invention belongs to the field of trestle foundation construction, and in particular relates to a trestle anchor pier foundation structure and a construction method thereof. Background Art

[0002] With the continuous progress of science and technology, bridge construction has developed by leaps and bounds, especially since the beginning of the 21st century, the bridge construction industry has flourished, and there are countless large-span bridges across inland rivers and canyons, and this development trend will continue for a long time in the future. The foundation setting of trestles in deep water, bare rock, and rapids areas has always been a topic that needs to be overcome in underwater bridge construction. In the past, the foundation of trestles in deep water, bare rock, and rapids areas in water usually adopted the method of adding anchor rods at the bottom of steel pipe piles to prevent the trestles from overturning. This method has its own advantages and disadvantages and is suitable for different construction environments. However, this method only solves the problem that the steel pipe pile foundation cannot be driven into the rock formation, and cannot solve the problem of the overall stability of the trestles. When the cantilever of the steel pipe pile foundation of the trestles is large, the foundation becomes a flexible structure. The passage of engineering vehicles and rapids will cause the trestles to deform greatly, which is not good for structural safety. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a pier anchoring pier foundation structure and a construction method thereof, so as to overcome the above problems or at least partially solve or alleviate the above problems.

[0004] The present invention proposes a foundation structure of a pier anchoring pier, comprising: four steel pipe piles and two auxiliary piles, the four steel pipe piles are distributed in a rectangular array, the lower end of each steel pipe pile is anchored in the stratum, a pile top beam is connected between the tops of two adjacent steel pipe piles on the left and right, and a Bailey main beam is erected on the pile top beam; an oblique rod and a parallel joint are arranged between two adjacent steel pipe piles on the front and back; two auxiliary piles are respectively vertically arranged on the outer sides of the two pairs of steel pipe piles on the left and right, and their lower ends are anchored in the stratum, and an oblique rod and a parallel joint are respectively arranged between each auxiliary pile and the two steel pipe piles.

[0005] Preferably, each auxiliary pile is equidistant from the two adjacent steel pipe piles in a straight line.

[0006] Preferably, the two auxiliary piles are symmetrically arranged on both sides of the four steel pipe piles.

[0007] Preferably, anchor rods are arranged in the lower ports of the steel pipe piles and the auxiliary piles, and the anchor rods are divided into three groups, and the three groups of anchor rods are distributed in a triangular array.

[0008] The present invention provides a construction method for a trestle anchor pier foundation structure, comprising the following steps:

[0009] S001: Vibrate and sink four steel pipe piles at the designed position, and fix the connecting frame between adjacent steel pipe piles to form a steel pipe pile foundation;

[0010] S002: Vibrate and sink two auxiliary piles at the designed position, measure the distance between the auxiliary piles and the steel pipe piles, and fix the connecting frame between the auxiliary piles and the steel pipe piles;

[0011] S003: clean the mud and sand in the four steel pipe piles and the two auxiliary piles, insert a plurality of anchor rods into the contact surfaces at the lower ends of the four steel pipe piles and the lower ends of the two auxiliary piles, and pour concrete into the four steel pipe piles and the two auxiliary piles to cover the anchor rods;

[0012] S004: Install a pile top beam between the tops of two adjacent steel pipe piles;

[0013] S005: Install Bailey main beam on the front and rear pile top beams.

[0014] In steps S001 and S002, the steel pipe piles and the auxiliary piles are vibrated and sunk onto the bedrock or to a depth of 1-2 m.

[0015] In step S003, if bedrock is encountered when the steel pipe piles and auxiliary piles are vibrated, the mud and sand in the steel pipe piles and auxiliary piles are cleared and drilling is performed directly; if bedrock is not encountered after the steel pipe piles and auxiliary piles are vibrated to a predetermined depth, the mud and sand in the steel pipe piles and auxiliary piles are cleared first, and then drilling is performed, and finally grouting is injected into the drilled hole for reinforcement.

[0016] In step S003, the drilling depth is 1.5-2.5 m, and the anchor rod is inserted into the drill hole, with the upper end of the anchor rod exposed above the ground for a length of 0.8-1.3 m.

[0017] The anchor rods in the steel pipe piles and auxiliary piles are divided into three groups, each group contains three anchor rods, and they are distributed in a triangular array.

[0018] The present invention utilizes the bond strength between anchoring concrete and four steel pipe piles and the friction force between anchor rods and rock formations to anchor the steel pipe piles and rock formations together, thereby enhancing the stability of the trestle in rapids; at the same time, two rows of steel pipe pile foundations and the auxiliary piles are connected to form an integral hexagonal foundation structure by arranging two auxiliary piles, thereby solving the problem of insufficient stability of the trestle in deep water, bare rock and rapids areas, and improving the safety of the trestle in this area; the anchor rods are utilized to achieve a frictional connection between the trestle foundation and the rock formation, thereby enhancing the anti-overturning stability of the trestle under the action of rapids. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the foundation structure of the trestle anchor pier of the present invention;

[0020] Figure 2 yes Figure 1Schematic diagram of the distribution structure of steel pipe piles and auxiliary piles.

[0021] In the above figure: 1 steel pipe pile; 2 auxiliary piles; 3 pile top beam; 4 Bailey main beam; 5 diagonal rods and parallel joints; 6 anchor rods; 7 concrete.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; DETAILED DESCRIPTION

[0023] Example 1

[0024] refer to Figure 1 and Figure 2 The embodiment of the first aspect of the present invention proposes a pier anchor pier foundation structure, including: four steel pipe piles 1 and two auxiliary piles 2, 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 stratum, a pile top beam 3 is connected between the tops of the two adjacent steel pipe piles 1 on the left and right, and a Bailey main beam 4 is erected on the pile top beam 3; an inclined rod and a parallel link 5 are arranged between the two adjacent steel pipe piles 1 on the front and rear; two auxiliary piles 2 are vertically arranged on the outer sides of the two pairs of steel pipe piles 1 on the left and right, and their lower ends are anchored in the stratum, and an inclined rod and a parallel link 5 are respectively arranged between each auxiliary pile 2 and the two steel pipe piles 1.

[0025] The four steel pipe piles 1 are distributed in a rectangular array and are welded and fixedly connected into a whole through inclined rods and parallel joints 5. The two auxiliary piles 2 are fixedly connected into a whole with the two steel pipe piles 1 on both sides of the four steel pipe piles 1 through inclined rods and parallel joints 5, forming a hexagonal structure of the trestle foundation, which improves the structural strength of the trestle foundation itself and solves the problem of insufficient stability of the trestle in deep water, bare rock and rapids. The lower ends of each steel pipe pile 1 and auxiliary pile 2 are anchored in the stratum, and the friction connection between the trestle foundation and the rock stratum is achieved by using anchor rods 6, thereby enhancing the anti-overturning stability of the trestle foundation under the action of rapids.

[0026] Example 2

[0027] refer to Figure 2 On the basis of Example 1, the straight-line distance between each auxiliary pile 2 and the two adjacent steel pipe piles 1 is equal.

[0028] The lengths of the two groups of inclined rods and parallel links 5 respectively connected to the front and rear steel pipe piles 1 of the auxiliary pile 2 are equal, which can ensure the front and rear balance of the support and pulling of the two steel pipe piles 1.

[0029] Example 3

[0030] refer to Figure 1 and Figure 2 On the basis of Example 2, two auxiliary piles 2 are symmetrically arranged on both sides of four steel pipe piles 1.

[0031] The two auxiliary piles 2 are equidistant from the two adjacent steel pipe piles 1 on the same side in the horizontal direction, so that the support and pulling of the four steel pipe piles 1 by the two auxiliary piles 2 are balanced left and right.

[0032] Example 4

[0033] refer to Figure 2 On the basis of Example 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.

[0034] There are nine anchor rods 6 in each steel pipe pile 1 and auxiliary pile 2. Three anchor rods 6 form a group. The three groups of anchor rods 6 are distributed in a triangular array. The three anchor rods 6 in each group are also distributed in a triangular array, which can improve the stability of the anchoring of the anchor rods 6.

[0035] Example 5

[0036] refer to Figure 1 and Figure 2 The embodiment of the second aspect of the present invention proposes a method for constructing a foundation structure of a pier anchor pier, comprising the following steps: S001: vibrating and sinking four steel pipe piles 1 at the designed position, and fixing diagonal rods and parallel joints 5 between adjacent steel pipe piles 1; S002: vibrating and sinking two auxiliary piles 2 at the designed position, and fixing diagonal rods and parallel joints 5 between the auxiliary piles 2 and the steel pipe piles 1; S003: cleaning the mud and sand in the four steel pipe piles 1 and the two auxiliary piles 2, and inserting a plurality of anchor rods 6 into the contact surfaces at the lower ends of the four steel pipe piles 1 and the 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: installing a pile top beam 3 between the tops of two adjacent steel pipe piles 1 on the left and right; S005: installing a Bailey main beam 4 on the front and rear two pile top beams 3.

[0037] The four steel pipe piles 1 are welded and fixedly connected into a whole through oblique rods and parallel joints 5, so that the four steel pipe piles 1 are distributed in a rectangular array, and the two auxiliary piles 2 are located on both sides of the traveling direction of the trestle on the steel pipe piles 1, and the two auxiliary piles 2 are fixedly connected to the two adjacent steel pipe piles 1 into a whole through oblique rods and parallel joints 5; after the mud and sand in the four steel pipe piles 1 and the two auxiliary piles 2 are pumped out, anchor rods 6 are inserted into the stratum in each steel pipe pile 1 and the auxiliary pile 2, and concrete 7 is poured, the steel pipe piles 1 and the auxiliary piles 2 are fixedly connected to the anchor rods 6 through the concrete 7, and the anchor rods 6 are anchored to the stratum, thereby improving the stability of the connection between the four steel pipe piles 1 and the two auxiliary piles 2 and the stratum. At this time, it is ensured that the tops of the four steel pipe piles 1 are in the same plane, and the pile top beam 3 is connected between the tops of the two steel pipe piles 1 on the left and right necklaces, and the pre-processed Bailey main beam 4 can be installed on the front and rear two pile top beams 3.

[0038] Example 6

[0039] refer to Figure 2 In S001 and S002, the steel pipe pile 1 and the auxiliary pile 2 are vibrated and sunk to the bedrock or the vibrated and sunk depth is 1-2m.

[0040] The vibration sinking depth of the steel pipe pile 1 and the auxiliary pile 2 is preferably 1.5 m, and the steel pipe pile 1 and the auxiliary pile 2 should be kept in a vertical state.

[0041] Example 7

[0042] refer to Figure 1 In S003, if bedrock is encountered when the steel pipe pile 1 and the auxiliary pile 2 are vibrated, the mud and sand in the steel pipe pile 1 and the auxiliary pile 2 are removed and drilling is performed directly. If the steel pipe pile 1 and the auxiliary pile 2 do not encounter bedrock after being vibrated to a predetermined depth, the mud and sand in the steel pipe pile 1 and the auxiliary pile 2 are removed first, and then drilling is performed, and finally grouting is injected into the drilled hole for reinforcement.

[0043] Whether bedrock is encountered is determined by the changes in the drilling rig's rotation pressure. If the drilling pressure increases sharply, it is considered that bedrock is encountered; if the drilling pressure changes gently, it is judged that bedrock is not encountered. At this time, after drilling to the designed depth, cement slurry is injected into the borehole to increase the strength and friction of the soil layer.

[0044] Example 8

[0045] refer to Figure 1 In S003, the drilling depth is 1.5-2.5 m, and the anchor rod 6 is inserted into the drilled hole. The length of the anchor rod 6 remaining in the steel pipe pile 1 or the auxiliary pile 2 is 0.8-1.3 m.

[0046] The drilling depth is preferably 2 m, the length of the anchor rod 6 remaining in the steel pipe pile 1 or the auxiliary pile 2 is preferably 1 m, and the anchor rod 6 is completely covered by concrete 7 .

[0047] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. A pier anchoring pier foundation structure, characterized in that: include: Four steel pipe piles (1) and two auxiliary piles (2), the four steel pipe piles (1) are arranged in a rectangular array, the lower end of each steel pipe pile (1) is anchored in the stratum, a pile top beam (3) is connected between the tops of two adjacent steel pipe piles (1) on the left and right, and a Bailey main beam (4) is mounted on the pile top beam (3); an inclined rod and a parallel link (5) are arranged between two adjacent steel pipe piles (1) on the front and back; the two auxiliary piles (2) are respectively arranged vertically on the outer sides of the two pairs of steel pipe piles (1) on the left and right, and the lower ends of the two auxiliary piles (2) are anchored in the stratum, and each An inclined rod and a parallel link (5) are respectively arranged between the auxiliary pile (2) and the two steel pipe piles (1); the straight-line distance between each auxiliary pile (2) and the two adjacent steel pipe piles (1) is equal, and the two auxiliary piles (2) are symmetrically arranged on both sides of the four steel pipe piles (1); anchor rods (6) are arranged in the lower ends of the steel pipe piles (1) and the auxiliary piles (2), and the anchor rods (6) are divided into three groups, and the three groups of anchor rods (6) are distributed in a triangular array, and the insertion length of the anchor rods (6) in the stratum is 1.5-2.5m.

2. A construction method for the pier anchoring pier foundation structure according to claim 1, characterized in that: The invention comprises the following steps: S001: vibrating and sinking four steel pipe piles (1) at the designed position, and fixing an inclined rod and a parallel joint (5) between adjacent steel pipe piles (1); S002: vibrating and sinking two auxiliary piles (2) at the designed position, and fixing an inclined rod and a parallel joint (5) between the auxiliary piles (2) and the steel pipe piles (1); S003: cleaning the mud and sand in the four steel pipe piles (1) and the two auxiliary piles (2), and inserting a plurality of anchor rods (6) into the lower ends of the four steel pipe piles (1) and the contact surfaces at the 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: installing a pile top beam (3) between the tops of two adjacent steel pipe piles (1) on the left and right; and S005: installing a Bailey main beam (4) on the front and rear two pile top beams (3).

3. The construction method of the pier anchoring pier foundation structure according to claim 2 is characterized in that: In S001 and S002, the steel pipe pile (1) and the auxiliary pile (2) are vibrated and sunk onto the bedrock or to a depth of 1-2 m.

4. The construction method of the pier anchoring pier foundation structure according to claim 2 is characterized in that: In S003, if bedrock is encountered when the steel pipe pile (1) and the auxiliary pile (2) are vibrated and sunk, the mud and sand in the steel pipe pile (1) and the auxiliary pile (2) are removed and drilling is performed directly; if the steel pipe pile (1) and the auxiliary pile (2) do not encounter bedrock after being vibrated and sunk to a predetermined depth, the mud and sand in the steel pipe pile (1) and the auxiliary pile (2) are removed first, and then drilling is performed, and finally grouting is injected into the drilled hole for reinforcement.

5. The construction method of the pier anchoring pier foundation structure according to claim 4 is characterized in that: In S003, the drilling depth is 1.5-2.5 m, the anchor rod (6) is inserted into the drilled hole, and the length of the anchor rod (6) remaining in the steel pipe pile (1) or the auxiliary pile (2) is 0.8-1.3 m.

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