A method for constructing anti-slide piles with reserved space for later reinforcement.

Abstract

This invention relates to the field of landslide slope prevention technology, and in particular to a method for constructing pre-reinforced anti-slide piles. Before the anti-slide pile is poured, several front and rear reinforcement holes are pre-reserved on the front and rear sides of the pile section, respectively. Three reinforcing bars are installed in each of the front and rear reinforcement holes. An anchorage slope is provided within 1m of the top front side of the anti-slide pile. Pre-reserved holes are opened on the anchorage slope, and OVM-type anchorages are detachably connected to these holes. A prestressed anchor cable is detachably connected to one end of the OVM-type anchorage extending into the pre-reserved hole. A spring is fitted onto the end of the OVM-type anchorage near the prestressed anchor cable. The end of the spring away from the prestressed anchor cable is fixedly connected to the OVM-type anchorage, and the end of the spring near the prestressed anchor cable abuts against the end of the prestressed anchor cable. This invention can effectively extend the service life of the anti-slide pile, reduce the amount of material used for reinforcement, and lower construction costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landslide slope prevention and treatment, in particular to a pre-reserved post-strengthening anti-slide pile and a construction method. BACKGROUND

[0002] The anti-slide pile is a pile column penetrating through the landslide body and into the slide bed, which is used to resist the sliding force of the landslide body and plays a role in stabilizing the slope. It is suitable for shallow and medium-thick layer landslides and is a main measure for anti-slide treatment. However, it is necessary to be cautious when piling to resist the sliding of an active landslide to avoid causing sliding due to vibration.

[0003] The role of the anti-slide pile on the landslide body is to balance the thrust of the sliding body with the resistance (anchoring force) of the stable stratum into which the anti-slide pile is inserted below the sliding surface, thereby increasing the stability. When the landslide body slides downward, it is resisted by the anti-slide pile, allowing the sliding body in front of the pile to reach a stable state. According to the thickness of the sliding body, the size of the thrust, waterproof requirements, and construction conditions, etc., reinforced concrete piles are often chosen. The anti-slide pile is buried in the stratum below a depth of one-third of the design pile length in soft rock strata, one-fourth of the design pile length in hard rock, and one-half of the design pile length in soil sliding beds. When the soil layer slides along the bedrock surface, the anchoring depth is also 2-5 times the diameter of the pile. The arrangement of the anti-slide pile includes pile rows connected to each other, pile rows spaced apart from each other, pile rows with spacing at the bottom and connection at the top, and anchor piles spaced apart from each other. The spacing between the pile columns is generally 3-5 times the diameter of the pile, with the principle of ensuring that the sliding soil does not slide out between the piles.

[0004] At present, under the influence of natural conditions, extreme heavy rainfall or earthquakes often cause insufficient bending tensile strength of the anti-slide pile, leading to problems such as shearing or tilting of the anti-slide pile. In view of this, under the influence of extreme natural conditions in the future, the landslide thrust may increase sharply, and the existing anti-slide pile cannot resist the increased landslide thrust. In addition, due to the occupation of the best treatment position during design and construction, it is very difficult to develop other corresponding technical means for reinforcement, and the reinforcement effect is not good. Therefore, research is needed on how to develop reinforcement measures based on the existing anti-slide pile to solve the problem of insufficient strength of the retaining structure. SUMMARY

[0005] The application aims to provide a post-reserved reinforcement anti-slide pile and a construction method.

[0006] To achieve the above object, the application provides the following solution: a post-reserved reinforcement anti-slide pile, which comprises a plurality of front-side reinforcement holes and rear-side reinforcement holes reserved in the front side and the rear side of the pile section of the anti-slide pile respectively before the pouring construction of the anti-slide pile, three steel bars are arranged in each of the front-side reinforcement holes and the rear-side reinforcement holes; an anchor device inclined surface is arranged in the front side of the top of the anti-slide pile within a range of 1 m, a reserved hole is arranged in the anchor device inclined surface, an OVM type anchor device is detachably connected in the reserved hole, one end of the OVM type anchor device extending into the reserved hole is detachably connected with a prestressed anchor cable, a spring is sleeved on one end of the OVM type anchor device close to the prestressed anchor cable, the end of the spring away from the prestressed anchor cable is fixedly connected with the OVM type anchor device, and the end of the spring close to the prestressed anchor cable abuts against the end of the prestressed anchor cable.

[0007] Preferably, the inclination angle of the anchor device inclined surface is equal to the horizontal included angle between the anchor device inclined surface and the prestressed anchor cable.

[0008] Preferably, the front-side reinforcement holes and the rear-side reinforcement holes are symmetrically arranged.

[0009] Preferably, cement mortar is filled in the reserved hole, the front-side reinforcement hole and the rear-side reinforcement hole.

[0010] A construction method of the post-reserved reinforcement anti-slide pile, which comprises the following steps:

[0011] S1. reserving a plurality of front-side reinforcement holes and rear-side reinforcement holes in the front side and the rear side of the pile section of the anti-slide pile respectively before the pouring construction of the anti-slide pile;

[0012] S2. arranging three steel bars in each of the front-side reinforcement holes and the rear-side reinforcement holes;

[0013] S3. filling cement mortar in the front-side reinforcement holes and the rear-side reinforcement holes;

[0014] S4. A reserved hole is formed in the front side of the top of the anti-slide pile within 1m;

[0015] S5. An OVM type anchorage, a spring and a prestressed anchor cable are installed in the reserved hole;

[0016] S6. Cement mortar is poured into the reserved hole;

[0017] S7. Tensioning and anchoring work is performed.

[0018] Preferably, the diameters of the front side reinforcing hole and the rear side reinforcing hole in step S1 are 8-10cm, and the depths of the holes are 1 / 3 of the length of the anchoring section of the anti-slide pile.

[0019] Preferably, the diameters of the steel bars in step S2 are 32mm, and gaps are left between the inner walls of the front side reinforcing hole and the rear side reinforcing hole and the steel bars.

[0020] Preferably, the strength of the cement mortar in step S3 is not less than C40, and an expansive agent with a cement dosage of 5% is added into the cement mortar.

[0021] Preferably, the reserved hole in step S4 is formed at a position 0.8m from the top of the anti-slide pile and a middle position of the load-bearing section, and the diameter of the reserved hole is 10cm, and a plurality of steel strands are arranged in the reserved hole.

[0022] Preferably, the horizontal included angle of the diameter of the reserved hole in step S4 is 18°.

[0023] The present application has the following technical effects:

[0024] The present application is reinforced in two aspects, on the one hand, a plurality of front side reinforcing holes and rear side reinforcing holes are formed along the front side and the rear side of the anti-slide pile respectively to bear the bending tensile strength reinforcement of the pile body of the anti-slide pile, on the other hand, a reserved hole is formed at the top and the middle of the anti-slide pile to provide a larger anchoring force for the pile body of the anti-slide pile, improve the shearing performance of the anti-slide pile, and change the passive reinforcement of the anti-slide pile to active reinforcement; the present application can effectively prolong the service life of the anti-slide pile, reduce the reinforcement materials of the anti-slide pile, and reduce the construction cost, and provide a new method for the reinforcement of the traditional anti-slide pile. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The structure of the present application is shown in the figure;

[0027] Figure 2 For the present invention Figure 1 Amplification schematic diagram of A in the present invention

[0028] Figure 3 For the present invention

[0029] Figure 4 For the present invention

[0030] Wherein, 1, sliding surface; 2, prestressed anchor cable; 3, rear side reinforcing hole; 4, front side reinforcing hole; 5, original stirrup; 6, original main force bar; 7, OVM type anchorage device; 8, spring; 9, anchorage device inclined surface. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] With reference to Figures 1-4 The present application provides a reserved post-strengthening anti-slide pile. During the design and construction of the anti-slide pile, the anti-slide pile body is used to prevent the increase of future landslide thrust, which causes insufficient anti-slide capacity of the anti-slide pile. The anti-slide pile is strengthened in the following two aspects.

[0034] In one aspect, in order to increase the bending tensile strength of the pile body of the anti-slide pile, a plurality of front-side reinforcing holes 4 and rear-side reinforcing holes 3 are respectively reserved on the front and rear sides of the pile section of the anti-slide pile before the pouring construction of the anti-slide pile. Since the anchoring section of the anti-slide pile is close to the bottom of the anti-slide pile, the bending tensile requirement is low, the opening depth of the front-side reinforcing hole 4 and the rear-side reinforcing hole 3 is 1 / 3 of the length of the anchoring section of the anti-slide pile, three steel bars are arranged in the front-side reinforcing hole 4 and the rear-side reinforcing hole 3, the specification of each steel bar is φ32, in order to ensure that the three φ32 steel bars become a bundle of air and can be respectively inserted into the front-side reinforcing hole 4 and the rear-side reinforcing hole 3, and to ensure that the steel bars are wrapped by cement mortar, the hole diameter of the front-side reinforcing hole 4 and the rear-side reinforcing hole 3 is 8-10 cm; at the same time, in order to reinforce the original force main reinforcement 6 when the anti-slide pile is in tension and compression, each front-side reinforcing hole 4 and rear-side reinforcing hole 3 is arranged between any two adjacent original force main reinforcements 6, the front-side reinforcing hole 4, the rear-side reinforcing hole 3 and the original force main reinforcement 6 are detachably connected with the original stirrup 5, so that the front-side reinforcing hole 4 and the rear-side reinforcing hole 3 are at least one original force main reinforcement 6 away from the edge of the anti-slide pile; in order to improve the bending tensile strength of the anti-slide pile, the rear side of the cross section of the anti-slide pile is usually under tension, in order to balance the force, a plurality of rear-side reinforcing holes 3 are arranged at the positions of the two ends of the rear side of the cross section, which can ensure that the tensioned steel bars are inserted and then filled with C40 cement mortar to ensure the tensile strength; and the front side of the cross section of the anti-slide pile is usually under compression, in order to balance the force, a plurality of front-side reinforcing holes 4 are arranged at the positions of the two ends of the front side of the cross section, which can ensure that the tensioned steel bars are inserted and then filled with C40 cement mortar to ensure the compressive strength.

[0035] On the other hand, in order to provide greater anchoring force, reduce the displacement of the top of the anti-slide pile, and improve the bending tensile strength of the anti-slide pile, according to the thickness of the sliding body of the sliding surface 1, an anchorage device inclined surface 9 is arranged within 1m of the front side of the top of the anti-slide pile, a reserved hole is formed on the anchorage device inclined surface 9 by impact drilling, a plurality of steel strands are arranged in the reserved hole, the diameter of the steel strands is 15.24mm, in order to accommodate seven steel strands in the reserved hole, the diameter of the reserved hole is 10cm, and an OVM type anchorage device 7 is embedded in the reserved hole, the OVM type anchorage device 7 is detachably connected with the reserved hole, the end of the OVM type anchorage device 7 inserted into the reserved hole is detachably connected with a prestressed anchor cable 2, in order to improve the strength of the anti-slide pile and control the deformation of the sliding surface 1, the inclination angle of the anchorage device inclined surface 9 is equal to the horizontal angle between the anchorage device inclined surface 9 and the prestressed anchor cable 2; a spring 8 is sleeved on the end of the OVM type anchorage device 7 close to the prestressed anchor cable 2, the end of the spring 8 away from the prestressed anchor cable 2 is fixedly connected with the OVM type anchorage device 7, the end of the spring 8 close to the prestressed anchor cable 2 abuts against the end of the prestressed anchor cable 2, to ensure the normal work of the prestressed anchor cable 2 in the later period; then cement mortar is filled into the reserved hole, and then the anchor cable anti-slide pile is formed by tensioning, to provide greater anchoring force for the pile body of the anti-slide pile, improve the shearing performance of the anti-slide pile, and change the passive reinforcement of the anti-slide pile to active reinforcement.

[0036] The present application can effectively prolong the service life of the anti-slide pile, reduce the material for reinforcing the anti-slide pile, and reduce the construction cost, and provides a new method for reinforcing the traditional anti-slide pile.

[0037] The present application also provides a construction method of the anti-slide pile with reserved post-reinforcement, comprising the following steps:

[0038] S1. In order to increase the bending tensile strength of the anti-slide pile body, a plurality of front-side reinforcing holes 4 and rear-side reinforcing holes 3 are reserved on the front and rear sides of the pile section of the anti-slide pile before the construction of the anti-slide pile; before pouring the anti-slide pile with concrete, a rubber plate can be bound at the corresponding position, and a release agent is brushed on the rubber plate, and after the concrete is poured and reaches 4 hours, the rubber plate is pulled out to complete the manufacturing of the front-side reinforcing holes 4 and the rear-side reinforcing holes 3. Since the bending tensile requirement near the bottom of the anti-slide pile is low, the opening depth of the front-side reinforcing holes 4 and the rear-side reinforcing holes 3 is 1 / 3 of the length of the anchoring section of the anti-slide pile.

[0039] S2. Three steel bars are arranged in the front-side reinforcing holes 4 and the rear-side reinforcing holes 3; in order to ensure the bonding strength of the cement mortar and the steel bars, and the bonding strength of the cement mortar and the front-side reinforcing holes 4 and the rear-side reinforcing holes 3, and meet the pulling strength, three steel bars with a diameter of 32 mm are arranged in the front-side reinforcing holes 4 and the rear-side reinforcing holes 3, and the specification of each steel bar is φ32, and a gap is left between the inner wall of the front-side reinforcing holes 4 and the rear-side reinforcing holes 3 and the steel bars; in order to ensure that the three φ32 steel bars become a bundle of loose clothes and can be respectively inserted into the front-side reinforcing holes 4 and the rear-side reinforcing holes 3, and ensure that the steel bars are wrapped with cement mortar around, the diameters of the front-side reinforcing holes 4 and the rear-side reinforcing holes 3 are 8-10 cm.

[0040] S3. Cement mortar is poured into the front-side reinforcing holes 4 and the rear-side reinforcing holes 3; the strength of the cement mortar is not less than C40, and an expanding agent with a dosage of about 5% of the cement is added, and the grouting in the front-side reinforcing holes 4 and the rear-side reinforcing holes 3 is full, so that the steel bars and the front-side reinforcing holes 4 and the rear-side reinforcing holes 3 become an integral whole through the cement mortar, and jointly reinforce the anti-slide pile to ensure that the tensile and compressive strength is met.

[0041] S4. In order to provide greater anchoring force, and in order to reduce the displacement of the top of the anti-slide pile, while improving the bending tensile strength of the anti-slide pile, according to the thickness of the sliding body of the sliding surface 1, an anchor inclined surface 9 is arranged within 1m of the top of the anti-slide pile, and a preformed hole is drilled on the anchor inclined surface 9 by impact drilling; in order to improve the strength of the anti-slide pile and control the deformation of the slope body, a preformed hole is drilled at the top of the anti-slide pile, the preformed hole is drilled at a position 0.8m from the top of the anti-slide pile and at the middle of the load-bearing section, a plurality of steel strands are arranged in the preformed hole, the diameter of the steel strands is 15.24mm, in order to accommodate seven steel strands in the preformed hole, the diameter of the preformed hole is 10cm; in order to improve the strength of the anti-slide pile and control the deformation of the sliding surface 1, the horizontal angle of the preformed hole diameter is 18°, and the inclination angle of the anchor inclined surface 9 is equal to the horizontal angle of the preformed hole diameter.

[0042] S5. Install the OVM type anchor 7, spring 8 and pre-stressed anchor cable 2 in the preformed hole; and make the inclination angle of the anchor inclined surface 9 equal to the horizontal angle of the anchor inclined surface 9 and the pre-stressed anchor cable 2, to ensure normal operation of the pre-stressed anchor cable 2 in the later stage.

[0043] S6. Pour cement mortar into the preformed hole; and make the grouting full.

[0044] S7. Perform tensioning and anchoring work to form an anchor cable anti-slide pile, change the reinforcement from passive anti-slide to active reinforcement, and improve the anti-slide capacity of the anti-slide pile.

[0045] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0046] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A post-constructed anti-slide pile for reservation, characterized in that: The application relates to a pile pouring construction method for anti-slide piles, which comprises the following steps: before the pile pouring construction of the anti-slide piles, a plurality of front-side reinforcing holes (4) and rear-side reinforcing holes (3) are respectively reserved on the front side and the rear side of the pile section of the anti-slide piles, three steel bars are arranged in the front-side reinforcing holes (4) and the rear-side reinforcing holes (3), an anchor slope (9) is arranged on the top of the anti-slide piles within a range of 1m of the front side, a reserved hole is formed in the anchor slope (9), an OVM type anchor (7) is detachably connected in the reserved hole, a prestressed anchor cable (2) is detachably connected to one end of the OVM type anchor (7) which extends into the reserved hole, a spring (8) is arranged on one end of the OVM type anchor (7) which is close to the prestressed anchor cable (2), and the other end of the spring (8) which is away from the prestressed anchor cable (2) is fixedly connected with the OVM type anchor (7), and the end of the prestressed anchor cable (2) which is close to the spring (8) is in abutment with the OVM type anchor (7).

2. The post-reserved reinforced anti-slide pile according to claim 1, characterized in that: The inclination angle of the anchor slope (9) is equal to the horizontal included angle between the anchor slope (9) and the prestressed anchor cable (2).

3. The post-reserved reinforced anti-slide pile according to claim 1, characterized in that: The front-side reinforcing holes (4) and the rear-side reinforcing holes (3) are symmetrically arranged.

4. The post-augmentation anti-slide pile of claim 1, wherein: Cement mortar is filled in the reserved hole, the front-side reinforcing holes (4) and the rear-side reinforcing holes (3).

5. A method for constructing a post-constructed reinforced anti-slide pile based on the post-constructed reinforced anti-slide pile according to any one of claims 1-4, characterized in that: The method comprises the following steps: S1. Before the pile pouring construction of the anti-slide piles, a plurality of front-side reinforcing holes (4) and rear-side reinforcing holes (3) are respectively reserved on the front side and the rear side of the pile section of the anti-slide piles; S2. Three steel bars are arranged in the front-side reinforcing holes (4) and the rear-side reinforcing holes (3); S3. Cement mortar is filled in the front-side reinforcing holes (4) and the rear-side reinforcing holes (3); S4. A reserved hole is formed in the top of the anti-slide piles within a range of 1m of the front side; S5. An OVM type anchor (7), a spring (8) and a prestressed anchor cable (2) are arranged in the reserved hole; S6. Cement mortar is filled in the reserved hole; S7. Tensioning and anchor sealing are performed.

6. The method of claim 5, wherein: The diameters of the front-side reinforcing holes (4) and the rear-side reinforcing holes (3) in step S1 are 8-10cm, and the depths of the holes are 1 / 3 of the length of the anchoring section of the anti-slide piles.

7. The method of claim 5, wherein: The diameters of the steel bars in step S2 are 32mm, and gaps are respectively left between the inner walls of the front-side reinforcing holes (4) and the rear-side reinforcing holes (3) and the steel bars.

8. The method of claim 5, wherein: The strength of the cement mortar in step S3 is not less than C40, and an expansive agent with a cement dosage of 5% is added into the cement mortar.

9. The method of claim 5, wherein: The reserved hole in step S4 is formed at a position 0.8m away from the top of the anti-slide pile and at the middle of the load-bearing section, the diameter of the reserved hole is 10cm, and a plurality of steel strands are arranged in the reserved hole.

10. The method of claim 5, wherein: The horizontal included angle of the diameter of the reserved hole in step S4 is 18 degrees.

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