Short pile rock anchor rod composite foundation

Abstract

The utility model relates to the technical field of hole pile foundations, and discloses a short pile rock anchor rod composite foundation which comprises a foundation pit used for pouring a short pile and an anchor hole used for arranging an anchor rod in a penetrating mode, a boss is arranged on the inner wall of the foundation pit and used for supporting a positioning plate, and the positioning plate is provided with a limiting hole for a drill rod to penetrate through. The drill rod is used for downwards forming the anchor hole from the foundation pit, and the anchor rod is arranged in the foundation pit and the anchor hole in a penetrating mode. According to the short pile rock anchor rod composite foundation, the squaring amount can be reduced, and the construction difficulty of a hole pile foundation is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of hole pile foundations, in particular to a short pile rock anchor composite foundation. Background Art

[0002] During the construction of bored pile foundations in power projects, when the tower foundation encounters weathered rock, especially moderately weathered rock, it is difficult to form a foundation pit. When mechanical drilling is used directly, the drill bit is prone to shaking and jumping, resulting in a large displacement of the pit. The use of manually excavated bored pile foundations requires a long construction period and high labor costs. In addition, a foundation pit that meets the force requirements must be directly excavated on this foundation, which requires a large amount of excavation and will cause great damage to the surrounding vegetation.

[0003] Therefore, it is necessary to propose a short pile rock anchor composite foundation to address the difficulty of foundation excavation in rocky areas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a short pile rock anchor composite foundation, reduce the square opening amount, and reduce the construction difficulty of the hole pile foundation.

[0005] In order to solve the above technical problems, the utility model provides a short pile rock anchor composite foundation, including a foundation pit for casting short piles, and anchor holes for penetrating anchor rods, the inner wall of the foundation pit is provided with a boss, the boss is used to support a positioning plate, the positioning plate is provided with a limiting hole for a drill rod to pass through, the drill rod is used to form the anchor hole from the foundation pit downwards, and the anchor rod is penetrated in the foundation pit and the anchor hole.

[0006] As an improvement of the above solution, a positioning groove adapted to the end of the drill rod is provided at the bottom of the foundation pit, and the limiting hole is arranged corresponding to the positioning groove.

[0007] As an improvement of the above solution, the boss includes a horizontal plane and a sloped surface located below the horizontal plane and extending from top to bottom in a direction away from the central axis of the foundation pit.

[0008] As an improvement of the above solution, at least two bosses are vertically provided on the inner wall of the foundation pit, and each of the bosses is circumferentially surrounded to form a tapered hole.

[0009] As an improvement of the above solution, anchor bars are provided in the foundation pit, and the anchor bars include a steel cage and the anchor rods. The anchor rods are arranged in a circular array in the steel cage, and the side walls of the anchor rods are in contact with the steel cage.

[0010] As an improvement of the above solution, the steel cage includes short pile main reinforcement, outer stirrups, and inner stirrups, wherein the inner stirrups are arranged inside the outer stirrups, the short pile main reinforcement is arranged between the outer stirrups and the inner stirrups, and the anchor rod is arranged inside the inner stirrups;

[0011] The main bars of the short piles are arranged in a circular array, the main bars of the short piles are tangent to the inner wall of the outer stirrups, the main bars of the short piles are tangent to the outer wall of the inner stirrups, and the anchor rods are tangent to the inner wall of the inner stirrups.

[0012] As an improvement of the above solution, the anchor rod extends from the foundation pit into the anchor hole, and slurry arranged around the anchor rod is poured into the anchor hole.

[0013] As an improvement of the above solution, a fixing claw is provided at the portion of the anchor rod extending into the anchor hole.

[0014] As an improvement of the above solution, the fixing claws are arranged in a circular array outside the anchor rod and are fixedly connected to the outer wall of the anchor rod.

[0015] As an improvement of the above solution, the foundation pit is arranged in a soil layer, the anchor holes are arranged in a rock layer below the soil layer, or the anchor holes extend from the soil layer to a rock layer below the soil layer.

[0016] As an improvement of the above scheme, the anchor bar includes a densified area and a non-densified area, the densified area is arranged above the non-densified area, and the distance between two adjacent outer stirrups in the densified area is smaller than the distance between two adjacent outer stirrups in the non-densified area.

[0017] The implementation of this utility model has the following beneficial effects:

[0018] The utility model discloses a short pile rock anchor composite foundation, which is provided with at least two bosses vertically on the inner wall of the foundation pit, the bosses are provided to protrude toward the inner wall of the foundation pit, and a positioning plate provided with a limiting hole is set on the bosses, so that a drill bit used for forming an anchor hole below the foundation pit can be inserted into the limiting hole of each positioning plate, so as to reduce the shaking and jumping of the drill bit during the screwing process, greatly reduce the deviation of the anchor hole, realize the reduction of the construction difficulty of the pile foundation, and reduce the construction cost;

[0019] Since the short-pile rock anchor composite foundation adopts a forming method that combines casting short piles in the foundation pit with setting anchors that extend into the anchor holes, compared with setting up a foundation pit alone for concrete pouring, the force-bearing effect of the entire composite foundation is better, the demand for foundation pit excavation can be reduced, and the damage to the surrounding vegetation can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an embodiment of a short pile rock anchor composite foundation of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the foundation pit;

[0022] Figure 3It is a structural diagram of the foundation pit and anchor holes;

[0023] Figure 4 It is a structural schematic diagram of the positioning plate;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the anchor bars in the foundation pit;

[0025] Figure 6 It is a structural diagram of the anchor rod. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figures 1 to 6 As shown, the utility model discloses an embodiment of a short pile rock anchor composite foundation, comprising a foundation pit 1 for casting short piles, a positioning groove 11 adapted to the end of a drill rod is provided at the bottom of the foundation pit 1, the drill rod is used to form an anchor hole 2 for inserting an anchor rod 3 from the positioning groove 11 downward, the anchor rod 3 is penetrated in the foundation pit 1 and the anchor hole 2, the inner wall of the foundation pit 1 is provided with a boss 12 protruding toward the inner wall, the boss 12 is used to support a positioning plate 4, the positioning plate 4 is provided with a limiting hole 41 for the drill rod to pass through, and the limiting hole 41 is arranged corresponding to the positioning groove 11.

[0028] In this embodiment, a positioning groove 11 is set at the bottom of the foundation pit 1, and at least two bosses 12 are vertically set on the inner wall of the foundation pit 1. The bosses 12 protrude toward the inner wall of the foundation pit 1. By placing a positioning plate 4 with a limiting hole 41 on the boss 12, the limiting hole 41 on the positioning plate 4 is set corresponding to the positioning groove 11. The drill bit used to form the anchor hole 2 below the foundation pit 1 can be inserted into the limiting hole 41 of each positioning plate 4 and abut against the positioning groove 11, so as to reduce the shaking and jumping of the drill bit during the screwing process, greatly reduce the deviation of the anchor hole 2, and achieve the reduction of the construction difficulty of the pile foundation and the construction cost. Since the short pile rock anchor 3 composite foundation adopts a forming method that combines casting short piles in the foundation pit 1 with setting anchor rods 3 extending into the anchor holes 2, compared with setting the foundation pit 1 alone for concrete pouring, the entire composite foundation has a stronger ability to withstand external forces and a better force-bearing effect, which can reduce the square opening demand of the foundation pit 1 and reduce the damage to the surrounding vegetation.

[0029] The foundation pit 1 is formed by manual excavation or by using a rotary drilling rig to dig holes in the soil layer A. The anchor hole 2 can be set in the rock layer B below the soil layer A, or extend from the soil layer A to the rock layer B below the soil layer A.

[0030] The longitudinal section of the boss 12 in the foundation pit 1 is a wedge-shaped gradually rising from bottom to top, and specifically includes a horizontal surface 121 for supporting the positioning plate 4, and a slope surface 122 located below the horizontal surface 121 and extending from top to bottom away from the central axis of the foundation pit 1. The slope surface 122 can facilitate the positioning plate 4 to enter and exit the foundation pit 1.

[0031] To help reduce the vibration of the drill bit, at least two bosses 12 are vertically arranged on the inner wall of the foundation pit 1. At the same time, when the drill bit is screwed into the anchor hole 2, a shock-absorbing sheet can be arranged between the positioning plate 4 and the horizontal surface 121, and a shock-absorbing ring can be arranged in the limiting hole 41 as needed.

[0032] The positioning plate 4 of this embodiment is circular, and the bosses 12 surround the conical hole circumferentially. On the one hand, the bosses 12 can effectively support the positioning plate 4, and on the other hand, the positioning plate 4 can be easily moved in and out of the foundation pit 1 by tilting the positioning plate 4.

[0033] The limiting holes 41 are arranged in a circular array on the positioning plate 4, and the drill bit used to form the anchor hole 2 below the foundation pit 1 can extend into the limiting hole 41 of each positioning plate 4 to form an anchor hole 2 for accommodating the anchor rod 3 below the foundation pit 1.

[0034] In this embodiment, after the anchor hole 2 is formed and before the foundation pit 1 is poured with concrete to form short piles, it is preferred to first arrange anchor bars with anchor rods 3 in the foundation pit 1 so that the anchor rods 3 on the anchor bars extend into the anchor hole 2 .

[0035] refer to Figure 5 The anchor bar specifically includes a short pile main bar 5, an outer stirrup 6, an inner stirrup 7 and the anchor rod 3. The inner stirrup 7 is arranged in the outer stirrup 6, the short pile main bar 5 is arranged between the outer stirrup 6 and the inner stirrup 7, and the anchor rod 3 is arranged in the inner stirrup 7. The short pile main bar 5 and the anchor rod 3 of this embodiment are arranged in a circular array, and the short pile main bar 5 is arranged tangent to the inner wall of the outer stirrup 6, the short pile main bar 5 is arranged tangent to the outer wall of the inner stirrup 7, and the anchor rod 3 is arranged tangent to the inner wall of the inner stirrup 7.

[0036] Among them, the outer stirrups 6 and the inner stirrups 7 are respectively fixed to the short pile main reinforcement 5 to form a steel cage, and the steel cage is arranged in the foundation pit 1.

[0037] After the anchor rod 3 extends from the foundation pit 1 into the anchor hole 2, grouting is first injected into the anchor hole 2 so that the slurry surrounds and covers the outside of the anchor rod 3. After the anchor rod 3 is fixed, the entire steel cage is put on the outside of the anchor rod 3 arranged in a circular array, and then concrete is poured into the foundation pit 1 to form the entire short pile rock anchor rod 3 composite foundation.

[0038] refer to Figure 6In order to strengthen the connection strength between the anchor rod 3 and the grout in the anchor hole 2, the anchor rod 3 of this embodiment is provided with a fixing claw 31 at the portion extending into the anchor hole 2. The ends of the fixing claws 31 are protruding upwards and are arranged in a circular array outside the anchor rod 3 and are fixed to the outer wall of the anchor rod 3 by welding.

[0039] In order to ensure the pouring effect of concrete in the foundation pit 1 and improve the structural strength of the composite foundation, in this embodiment, the arrangement density of the short pile main reinforcement 5 is preferably greater than the arrangement density of the anchor rod 3, and the arrangement density of the outer hoop reinforcement 6 on the steel cage is greater than the arrangement density of the inner hoop reinforcement 7. More preferably, the cross-sectional area of ​​the anchor rod 3 is greater than the cross-sectional area of ​​the short pile main reinforcement 5.

[0040] Among them, the steel cage includes a densified area and a non-densified area, the densified area is arranged above the non-densified area, and the densified area protrudes toward the upper part of the soil layer A, and the distance between two adjacent external stirrups 6 in the densified area is smaller than the distance between two adjacent external stirrups 6 in the non-densified area, that is, the external stirrups 6 in the densified area are arranged more densely to strengthen the foundation structure strength located on the upper part of the soil layer A, so that the entire composite foundation can withstand external forces more strongly.

[0041] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A short pile rock anchor composite foundation, characterized in that: It includes a foundation pit for casting short piles and anchor holes for passing anchor rods. The inner wall of the foundation pit is provided with a boss, the boss is used to support a positioning plate, the positioning plate is provided with a limiting hole for a drill rod to pass through, the drill rod is used to form the anchor hole from the foundation pit downwards, and the anchor rod is passed through the foundation pit and the anchor hole.

2. The short pile rock anchor composite foundation according to claim 1, characterized in that: A positioning groove adapted to the end of the drill rod is provided at the bottom of the foundation pit, and the limiting hole is arranged corresponding to the positioning groove.

3. The short pile rock anchor composite foundation according to claim 1, characterized in that: The boss includes a horizontal plane and a sloped surface located below the horizontal plane and extending from top to bottom in a direction away from the central axis of the foundation pit.

4. The short pile rock anchor composite foundation according to claim 1 or 3, characterized in that: At least two bosses are vertically arranged on the inner wall of the foundation pit, and each boss is circumferentially surrounded to form a tapered hole.

5. The short pile rock anchor composite foundation according to claim 1, characterized in that: Anchor bars are arranged in the foundation pit, and the anchor bars include a steel cage and anchor rods. The anchor rods are arranged in a circular array in the steel cage, and the side walls of the anchor rods are in contact with the steel cage.

6. The short pile rock anchor composite foundation according to claim 5, characterized in that: The steel cage comprises short pile main reinforcement, outer stirrups and inner stirrups, wherein the inner stirrups are arranged inside the outer stirrups, the short pile main reinforcement is arranged between the outer stirrups and the inner stirrups, and the anchor rod is arranged inside the inner stirrups; The main bars of the short piles are arranged in a circular array, the main bars of the short piles are tangent to the inner wall of the outer stirrups, the main bars of the short piles are tangent to the outer wall of the inner stirrups, and the anchor rods are tangent to the inner wall of the inner stirrups.

7. The short pile rock anchor composite foundation according to claim 1, characterized in that: The anchor rod extends from the foundation pit into the anchor hole, and slurry arranged around the anchor rod is poured into the anchor hole.

8. The short pile rock anchor composite foundation according to claim 7, characterized in that: The portion of the anchor rod extending into the anchor hole is provided with a fixing claw.

9. The short pile rock anchor composite foundation according to claim 8, characterized in that: The fixing claws are arranged outside the anchor rod in a circumferential array and are fixedly connected to the outer wall of the anchor rod.

10. The short pile rock bolt composite foundation according to claim 4, characterized in that: The foundation pit is arranged in a soil layer, the anchor hole is arranged in a rock layer below the soil layer, or the anchor hole extends from the soil layer to a rock layer below the soil layer.

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