CN112095632A - A pile-arch combined support structure and construction method thereof - Google Patents

Abstract

The invention relates to the technical field of slope and landslide support, in particular to a pile-arch combined support structure and a construction method thereof, comprising a plurality of parallel and vertical anti-sliding piles, and the lower ends of the anti-sliding piles are embedded in In the stable bedrock at the bottom of the slope, an arched arched structure is arranged between the two adjacent anti-slide piles, and the outer arc surface of the arched structure faces the airside side of the slope. The two arch feet of the arched structure are respectively fixedly connected with the two adjacent anti-sliding piles, and an inter-arch unloading platform is fixed between the outer arc surfaces of the two adjacent arched structures. The beneficial effects of the invention are as follows: the advantages of the arched structure are fully utilized, the horizontal earth pressure is converted into the radial pressure of the arched structure, and finally the pressure of the arched structure is transmitted to the anti-sliding pile, and the unloading platform is arranged between the arched structures, By increasing the overall stiffness and anti-overturning moment of the retaining wall, the distance between the anti-sliding piles can be greatly increased, the number of anti-sliding piles can be greatly reduced, and the reliability of the supporting structure system is improved.

Description

A pile-arch combined support structure and construction method thereof

technical field

The invention relates to the technical field of slope and landslide support, in particular to a pile-arch combined support structure and a construction method thereof.

Background technique

A traditional pile-sheet retaining wall generally includes a plurality of anti-sliding piles, and baffles between the piles are arranged between two adjacent anti-sliding piles, and the slope soil layer is blocked by the baffles between the piles. The traditional retaining wall between piles requires a baffle between the piles to support the slope, so the strength of the baffle between the piles is relatively large, so that the length of the baffle between the piles is small. In addition, the traditional pile-sheet retaining wall baffles between the piles only prevent the collapse of the soil between the piles, and the function of the inter-pillar baffles is not fully exerted. The anti-sliding pile spacing is small, usually 3-5 meters, which makes the construction period of the traditional pile-sheet retaining wall. Long, high engineering cost.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a combined pile-arch retaining structure and a construction method thereof, making full use of the advantages of the arch structure, converting the horizontal earth pressure into the radial pressure of the arch, making full use of the compressive strength of concrete, and finally The load of the arch support is transferred to the generalized anti-sliding pile, which reduces the load of the baffle plate between the piles, and the spacing between the piles can be greatly increased, which improves the reliability of the support structure system.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a pile-arch combined support structure includes a plurality of anti-sliding piles arranged in parallel and vertically, and the lower ends of the anti-sliding piles are embedded in the stable bedrock at the bottom of the slope. There is an arched arched structure between two adjacent anti-slide piles, the outer arc surface of the arched structure faces the side slope, and the two arched feet of the arched structure are respectively connected to the side slope. The two adjacent anti-sliding piles are fixedly connected, and an inter-arch unloading platform is fixed between the outer arc surfaces of the two adjacent arch structures.

The beneficial effects of the invention are as follows: the anti-sliding pile and the anti-sliding pile are connected by an arched structure, the advantages of the arched structure are fully utilized, the horizontal earth pressure is converted into the radial pressure of the arched structure, and the arched structure is fully utilized. The final compressive strength of the arched structure is transferred to the anti-sliding piles, and the spacing of the anti-sliding piles can be greatly increased, which greatly reduces the number of anti-sliding piles, reduces the cost and construction difficulty of the fill slope support, and improves the support. The reliability of the structural system; for the fill slope, the anti-overturning moment is provided through the unloading platform, which greatly reduces the cross-section and reinforcement of the anti-sliding pile, and the anti-sliding pile and the arch structure are connected as a whole through the unloading platform plate. Improve the overall stability and stiffness of the structure.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the axes and outer diameters of the upper and lower parts of the arched structure are the same.

The beneficial effect of adopting the above-mentioned further scheme is that the upper and lower overall outer diameters of the arched structure are the same, which facilitates the manufacture of the arched structure.

Further, the outer diameter of the lower portion of the arched structure is smaller than the outer diameter of the upper portion thereof.

The beneficial effects of adopting the above-mentioned further scheme are: the arched structure adopts a structure with a large outer diameter at the upper part and a small outer diameter at the lower part, and the pressure of the slope soil is transferred to the stable bedrock at the bottom of the slope through the inclined arched structure. Reduce the pressure on the arched structure and improve the reliability of the support structure.

Further, the anti-sliding pile includes an anti-sliding pile body, and the arch foot of the arched structure is fixedly connected with the anti-sliding pile body.

The beneficial effect of adopting the above-mentioned further scheme is that the anti-sliding pile adopts the structure of a single anti-sliding pile body, which has simple structure, low cost and convenient manufacture.

Further, the anti-sliding piles include rear row piles and front row piles, the arch foot of the arched structure is fixedly connected to the side of the rear row piles facing the side slope, and the front row piles are arranged on the rear row piles. On the side away from the side slope, the front-row piles and the rear-row piles are arranged at intervals, and a support beam is fixed between the tops of the rear-row piles and the tops of the front-row piles.

The beneficial effect of adopting the above-mentioned further scheme is: the anti-sliding pile adopts the structure of the rear row pile and the front row pile connected by the supporting beam at the top, so as to improve the stability of the anti-sliding pile support, thereby ensuring the stability of the entire blocking structure and being able to carry a relatively high load. great sliding force.

Further, the anti-sliding piles include a rear row of straight piles, a front row of straight piles and a front row of inclined piles. and the front row of inclined piles are arranged on the side of the rear row of straight piles away from the side slope, the top height of the front row of straight piles is lower than the height of the rear row of straight piles, the front row of straight piles The top end of the pile is integrally and fixedly connected with the lower end of the front row inclined pile, the top end of the front row inclined pile is inclined to the top end direction of the rear row straight pile, and the top end of the front row inclined pile is connected with the top end of the front row inclined pile. The top of the rear row of straight piles is fixedly connected.

The beneficial effect of adopting the above-mentioned further scheme is: the anti-sliding pile adopts the rear row straight pile and the front row straight pile connected by the front row slanted pile, the rear row straight pile is supported by the front row straight pile, and the strength of the anti-sliding pile support is improved. , thereby improving the stability of the entire blocking structure.

Further, the anti-sliding piles include truss rear row piles and truss front row piles, the arch foot of the arched structure is fixedly connected to the side of the truss rear row piles facing the side slope, and the truss front row piles are provided with On the side of the truss rear row piles away from the side slope, a support for connecting the truss rear row piles and the truss front row piles is provided between the truss rear row piles and the truss front row piles truss.

The beneficial effect of adopting the above-mentioned further scheme is that the anti-sliding pile adopts the truss rear row piles and the truss front row piles connected by the supporting truss, so as to improve the supporting strength of the whole anti-sliding pile, thereby ensuring the reliability of the whole blocking structure.

Further, the unloading platform between the arches is a reinforced concrete structure, and the unloading platform between the arches is arranged at intervals from the upper surface of the stable bedrock at the bottom of the slope.

The beneficial effect of adopting the above-mentioned further scheme is that the unloading platform between arches adopts reinforced concrete structure, which is convenient to manufacture and has high strength, and can ensure the stability and rigidity of the unloading platform between arches.

A construction method of the pile-arch combined support structure as described above, comprising the following steps:

Step 1. Construction of anti-sliding piles: determine the position of anti-sliding piles, and construct anti-sliding piles at the designated positions by static pressure or drilling or pouring concrete; The high-pressure rotary jetting pile is formed, and the cast-in-place reinforced concrete construction technology is used for the fill slope.

Step 2, setting up an arched structure: setting an arched structure between two adjacent anti-sliding piles, and connecting the arched feet of the arched structure with the two adjacent anti-sliding piles respectively;

Step 3, set up the platform between the arches: pour the unloading platform between the arches between the two adjacent arch structures, so that the unloading platform between the arches is connected to the outer arc surface of the two adjacent arch structures. Fixed connection to increase overturning moment;

Step 4, repeat steps 1 to 3 until all anti-sliding piles, arch structures and platforms between arches are installed;

Step 5, fill the back of the wall, fill in the fill between the slope and the arched structure, and complete the construction.

Further, in the second step, the method for arranging an arched structure between two adjacent anti-sliding piles includes: arranging an arched structure between the two adjacent anti-sliding piles by pouring; or The poured arched structure is hoisted between two adjacent anti-sliding piles, and then the arch feet of the arched structure are respectively fixed on the two anti-sliding piles through rigid connectors.

The beneficial effect of adopting the above scheme is: the earth pressure (landslide thrust) is converted into the radial pressure of the arch through the arch structure, and the advantage of the high compressive strength of the concrete material is fully utilized. A part of the axial force of the arched structure at the connection point is balanced, and the other part is left and right with the anti-sliding pile, which improves the overall stability and rigidity of the structure and improves the reliability of the support structure.

Description of drawings

Fig. 1 is the top view of the pile-arch joint support structure of the present invention;

Fig. 2 is the sectional view of the first embodiment of the A-A surface in Fig. 1 of the present invention;

Fig. 3 is the sectional view of the second embodiment of the A-A surface in Fig. 1 of the present invention;

Fig. 4 is the sectional view of the third embodiment of the A-A surface in Fig. 1 of the present invention;

Fig. 5 is the sectional view of the fourth embodiment of the A-A surface in Fig. 1 of the present invention;

Fig. 6 is the sectional view of the fifth embodiment of the A-A side in Fig. 1 of the present invention;

In the accompanying drawings, the list of components represented by each number is as follows:

1. Anti-sliding piles, 2. Arch structure, 3. Unloading platform between arches, 4. Anti-sliding piles, 5. Rear row piles, 6. Front row piles, 7. Support beam, 8. Rear row straight piles , 9, front row straight piles, 10, front row inclined piles, 11, truss rear row piles, 12, truss front row piles, 13, support truss.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

Example 1

As shown in FIG. 1 , this embodiment includes a plurality of anti-sliding piles 1 arranged side by side and vertically. In this embodiment, the anti-sliding piles 1 can be steel piles, concrete piles, reinforced concrete piles, and shaped steel concrete. The shape of the anti-sliding pile 1 can be a rectangular pile, a circular pile, etc. The lower end of the anti-sliding pile 1 is embedded in the stable bedrock at the bottom of the slope, and the two adjacent anti-sliding piles There is an arched arched structure 2 between the Refers to the two vertical end faces of the arched structure 2) are fixedly connected to the two adjacent anti-sliding piles 1 respectively, and the specific connection method can be fixed by pouring concrete reinforcement bars or by fixing parts, such as rivets, etc. Fixed, between the outer arc surfaces of the two adjacent arch structures 2 are fixed with an inter-arch unloading platform 3, and the inter-arch unloading platform 3 is arranged horizontally. Preferably, the arch structure 2 The axis is on the center line of the connecting line of the two anti-sliding piles 1 . Connect the anti-sliding pile 1 and the anti-sliding pile 1 with the arched structure 2, make full use of the advantages of the arched structure, convert the horizontal earth pressure into the radial pressure of the arched structure 2, and make full use of the resistance of the arched structure 2. compressive strength, and finally the load of the arched structure 2 is transferred to the anti-sliding piles 1, and the spacing of the anti-sliding piles 1 can be greatly increased, which greatly reduces the number of anti-sliding piles 1, reduces the cost and construction difficulty of the fill slope support, and improves the The reliability of the supporting structure system; the anti-overturning moment is provided by the unloading platform, which greatly reduces the cross-section and reinforcement of the anti-sliding pile 1. The anti-sliding pile 1 and the arch structure 2 are connected as a whole through the unloading platform plate. Improve the overall stability and rigidity of the structure.

The present embodiment also discloses a construction method of the pile-arch joint support structure as described above, comprising the following steps:

Step 1, construct anti-sliding pile 1: determine the position of anti-sliding pile 1, and construct anti-sliding pile 1 at the designated position by static pressure or drilling insert or drilling concrete;

Step 2, set up the arched structure 2: set up the arched structure 2 between the two adjacent anti-sliding piles 1, and connect the arched feet of the arched structure 2 with the two adjacent anti-sliding piles respectively. 1 fixed connection;

Step 3, set up the platform between the arches: pour the unloading platform 3 between the arches between the two adjacent arch structures 2, so that the unloading platform 3 between the arches and the two adjacent arch structures 2 The outer arc surface is fixedly connected;

Step 4, repeat steps 1 to 3 until all anti-sliding piles 1, arch structures 2 and platforms between arches are installed;

Step 5: Fill soil behind the wall, and fill soil between the side slope and the arched structure 2 to complete the construction.

Further, in the second step, the method for arranging the arched structure 2 between the two adjacent anti-sliding piles 1 includes: arranging the arched structure between the two adjacent anti-sliding piles 1 by pouring structure 2; or hoist the poured arched structure 2 between two adjacent anti-sliding piles 1, and then fix the arched feet of the arched structure 2 on the two adjacent anti-sliding piles 1 through rigid connectors Anti-slide pile 1.

The earth pressure (landslide thrust) is converted into the radial pressure of the arch through the arch structure, and the advantage of the high compressive strength of the concrete material is fully utilized. Part of the axial force of 2 is balanced, and the other part is left and right with the anti-sliding pile 1, which improves the overall stability and rigidity of the structure and improves the reliability of the supporting structure.

Embodiment 2

As shown in FIG. 2 , this embodiment further includes the following technical solutions on the basis of Embodiment 1: the axes and outer diameters of the upper and lower parts of the arched structure 2 are the same, and the upper and lower overall outer diameters of the arched structure 2 are the same, The manufacture of the arched structure 2 is facilitated.

Specifically, the anti-sliding pile 1 includes an anti-sliding pile body 4 , and the arch foot of the arched structure 2 is fixedly connected to the anti-sliding pile body 4 . The anti-sliding pile 1 adopts the structure of a single anti-sliding pile body 4, which is simple in structure, low in cost and convenient in manufacture.

Embodiment 3

As shown in 3, this embodiment further includes the following technical solutions on the basis of Embodiment 1: the axes and outer diameters of the upper and lower parts of the arched structure 2 are the same, and the upper and lower overall outer diameters of the arched structure 2 are the same, which is convenient for Fabrication of the arched structure 2. The anti-sliding pile 1 includes a rear row pile 5 and a front row pile 6, the arch foot of the arched structure 2 is fixedly connected with the side of the rear row pile 5 facing the side slope, and the front row pile 6 is arranged at the place. The rear row piles 5 are far from the side of the side slope, the front row piles 6 and the rear row piles 5 are spaced apart, and the tops of the rear row piles 5 and the front row piles 6 are fixed. A support beam 7 is provided. The anti-sliding pile 1 adopts the structure of the rear row pile 5 and the front row pile 6 connected by the supporting beam 7 at the top, so as to improve the stability of the support of the anti-sliding pile 1, thereby ensuring the stability of the entire blocking structure.

Embodiment 4

As shown in FIG. 4 , this embodiment further includes the following technical solutions on the basis of Embodiment 1: the axes and outer diameters of the upper and lower parts of the arched structure 2 are the same, and the upper and lower overall outer diameters of the arched structure 2 are the same, The manufacture of the arched structure 2 is facilitated. The anti-slide pile 1 includes a rear row of straight piles 8, a front row of straight piles 9 and a front row of inclined piles 10. The arch foot of the arched structure 2 is fixedly connected to the side of the rear row of straight piles 8 facing the side slope. The front row of straight piles 9 and the front row of inclined piles 10 are both arranged on the side of the rear row of straight piles 8 away from the side slope, and the top of the front row of straight piles 9 is lower than the rear row of straight piles. 8, the top of the front row of straight piles 9 is integrally and fixedly connected to the lower end of the front row of inclined piles 10, and the top of the front row of inclined piles 10 is inclined towards the top of the rear row of straight piles 8. The top end of the front row of inclined piles 10 is fixedly connected with the top end of the rear row of straight piles 8 . The anti-sliding pile 1 adopts the rear row straight pile 8 and the front row straight pile 9 connected by the front row inclined pile 10, and the rear row straight pile 8 is supported by the front row straight pile 9, so as to improve the supporting strength of the anti-sliding pile 1, thereby Improve the stability of the entire barrier structure.

Embodiment 5

As shown in FIG. 5 , this embodiment further includes the following technical solutions on the basis of Embodiment 1: the axes and outer diameters of the upper and lower parts of the arched structure 2 are the same, and the upper and lower overall outer diameters of the arched structure 2 are the same, The manufacture of the arched structure 2 is facilitated. The anti-sliding pile 1 includes a truss rear row pile 11 and a truss front row pile 12. The arch foot of the arched structure 2 is fixedly connected to the side of the truss rear row pile 11 facing the side slope. The row piles 12 are arranged on the side of the truss rear row piles 11 away from the side slope, and between the truss rear row piles 11 and the truss front row piles 12 are provided for connecting the truss rear row piles 11 and The supporting truss 13 of the piles 12 in the front row of the truss. The anti-sliding pile 1 adopts the truss rear row piles 11 and the truss front row piles 12 connected by the supporting truss 13 to improve the supporting strength of the entire anti-sliding pile 1, thereby ensuring the reliability of the entire blocking structure. In this embodiment, the support truss 13 includes horizontal beams and oblique bars, a plurality of the beams are arranged at intervals, and the two ends are respectively fixedly connected to the rear row piles 11 of the truss and the front row piles 12 of the truss, The inclined rods are arranged between two adjacent beams, and are used for fixedly connecting the piles 11 in the rear row of the truss and the piles 12 in the front row of the truss and/or two adjacent beams.

Embodiment 6

As shown in FIG. 6 , the difference between this embodiment and the above-mentioned Embodiments 2 to 5 is that the outer diameter of the lower part of the arched structure 2 is smaller than the outer diameter of the upper part of the arched structure 2 . The outer diameter increases sequentially from bottom to top. The arch structure 2 adopts a structure with a large outer diameter in the upper part and a small outer diameter in the lower part. Through the inclined arch structure 2, the pressure of the slope soil received is transmitted to the stable foundation of the slope bottom. It can reduce the pressure on the arched structure 2 and improve the reliability of the support structure. Preferably, the bottom and the top of the arched structure 2 form an included angle of 70 degrees. After testing, when the bottom and the top of the arched structure 2 form an included angle of 70 degrees, the earth pressure acting on the arched structure 2 Decrease about 30%.

The present invention converts the earth pressure (landslide thrust) into the radial pressure of the arch through the arch structure, and makes full use of the advantage of high compressive strength of the concrete material. One part of the force is balanced, and the other part is left and right with the support. It reduces the load of the generalized anti-sliding pile 1 of the bearing. After the anti-sliding pile 1 and between the two adjacent arch structures 2, an inter-arch unloading platform 3 is arranged, wherein the inter-arch unloading platform 3 is a reinforced concrete structural plate, and the width and height of the inter-arch unloading platform 3 are based on The specific calculation determines that the anti-overturning moment is provided by the unloading platform 3 between the arches, which greatly reduces the cross-section and reinforcement of the pile. The piles and the arched structure are connected as a whole by the unloading platform 3 between the arches, which improves the overall stability and rigidity of the structure.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A pile-arch joint support structure, characterized in that it comprises a plurality of anti-sliding piles (1) arranged in parallel and vertically, and the lower ends of the anti-sliding piles (1) are embedded in the slope bottom stable foundation In the rock, an arched arched structure (2) is arranged between two adjacent anti-sliding piles (1), and the outer arc surface of the arched structure (2) faces the air of the side slope. side, the two arched feet of the arched structure (2) are respectively fixedly connected with the two adjacent anti-sliding piles (1), and the outer arc surfaces of the two adjacent arched structures (2) An unloading platform (3) between the arches is fixed between them. 2 . The combined pile-arch retaining structure according to claim 1 , wherein the axes and outer diameters of the upper and lower parts of the arched structure ( 2 ) are the same. 3 . 3 . The combined pile-arch retaining structure according to claim 1 , wherein the outer diameter of the lower part of the arched structure ( 2 ) is smaller than the outer diameter of the upper part. 4 . The combined pile-arch support structure according to any one of claims 1 to 3, wherein the anti-sliding pile (1) comprises an anti-sliding pile body (4), and the arched structure ( 2) The arch foot is fixedly connected with the anti-sliding pile body (4). 5. The pile-arch combined support structure according to any one of claims 1 to 3, wherein the anti-sliding pile (1) comprises a rear row pile (5) and a front row pile (6), The arch foot of the arched structure (2) is fixedly connected with the side of the rear row of piles (5) facing the side slope, and the front row of piles (6) is arranged on the rear row of piles (5) away from the side. On one side of the slope, the front-row piles (6) and the rear-row piles (5) are arranged at intervals, and the tops of the rear-row piles (5) and the tops of the front-row piles (6) are fixedly arranged. There are supporting beams (7). 6. The combined pile-arch support structure according to any one of claims 1 to 3, wherein the anti-sliding pile (1) comprises a rear row of straight piles (8) and a front row of straight piles (9). ) and the front row of inclined piles (10), the arch foot of the arched structure (2) is fixedly connected to the side of the rear row of straight piles (8) facing the side slope, the front row of straight piles (9) and the front row of straight piles (9) The row of inclined piles (10) are all arranged on the side of the rear row of straight piles (8) away from the side slope, and the top of the front row of straight piles (9) is lower than the rear row of straight piles (8) height, the top of the front row of straight piles (9) is integrally and fixedly connected with the lower end of the front row of inclined piles (10), and the top of the front row of inclined piles (10) is connected to the rear row of straight piles The top end direction of (8) is inclined, and the top end of the front row of inclined piles (10) is fixedly connected with the top end of the rear row of straight piles (8). 7 . The combined pile-arch support structure according to claim 1 , wherein the anti-sliding piles ( 1 ) comprise truss rear row piles ( 11 ) and truss front row piles ( 12 ). 8 . ), the arch foot of the arched structure (2) is fixedly connected with the side of the rear row piles (11) of the truss facing the side slope, and the front row piles (12) of the truss are arranged on the rear row piles of the truss (11) On the side away from the side slope, between the truss rear row piles (11) and the truss front row piles (12) are provided for connecting the truss rear row piles (11) and the truss The supporting trusses (13) of the front row piles (12). 8. The pile-arch combined support structure according to any one of claims 1 to 3, wherein the unloading platform (3) between the arches is a reinforced concrete structure, and the unloading platform (3) between the arches is a reinforced concrete structure. 3) It is spaced from the upper surface of the stable bedrock at the bottom of the slope. 9. A construction method of the combined pile-arch retaining structure as claimed in any one of claims 1 to 8, characterized in that, comprising the following steps: Step 1, constructing the anti-sliding pile (1): determine the position of the anti-sliding pile (1), and construct the anti-sliding pile (1) at the designated position by means of static pressure or drilling insertion or drilling and pouring concrete; Step 2, setting up an arched structure (2): setting an arched structure (2) between two adjacent anti-sliding piles (1), and placing the arched feet of the arched structure (2) with the adjacent ones, respectively. The two anti-sliding piles (1) are fixedly connected; Step 3, setting the inter-arch platform: pouring the inter-arch unloading platform (3) between the two adjacent arch structures (2), so that the inter-arch unloading platform (3) and the adjacent two The outer arc surfaces of the arched structure (2) are fixedly connected; Step 4, repeat steps 1 to 3 until all the anti-sliding piles (1), the arched structure (2) and the platform between the arches are installed; Step 5, fill soil behind the wall, fill soil between the side slope and the arched structure (2), and complete the construction. 10. The construction method of the combined pile-arch retaining structure according to claim 9, characterized in that, in the second step, an arched structure (2) is arranged between two adjacent anti-sliding piles (1). The method comprises: arranging an arched structure (2) between two adjacent anti-sliding piles (1) by pouring; or hoisting the poured arched structure (2) to two adjacent anti-sliding piles (1). Between the anti-sliding piles (1), the arch feet of the arched structure (2) are respectively fixed on the two anti-sliding piles (1) through rigid connectors.

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