Stiff composite inclined pile supporting structure

Abstract

The utility model relates to a stiff composite inclined pile supporting structure which comprises a building envelope and inclined piles, a surrounding purlin is arranged at the top of the building envelope, one end of each inclined pile is connected with the surrounding purlin, and the other end of each inclined pile extends into a cement reinforcing body in a soil body in a foundation pit. The cement reinforcing body is of a blocky structure after being solidified; and the cement reinforcing body is formed by vertically drilling a hole into a soil body through stirring, drilling and grouting equipment and then grouting into a hard soil layer. According to the utility model, the vertical guide holes are grouted and reinforced to form the cement reinforcing body, and the cement reinforcing body can greatly improve the bearing capacity of the inclined pile; by means of the vertical guide hole grouting mode, hard soil layer grouting can be achieved, the hard soil layer can be temporarily loosened, construction of an inclined pile (such as a steel pipe pile) is facilitated, and the technical effect that two purposes are achieved at a time is achieved.

Description

Technical Field

[0001] The utility model relates to an inclined pile supporting structure, in particular to a rigid composite inclined pile supporting structure, belonging to the technical field of foundation pit construction. Background Art

[0002] Some forms of support in foundation pit projects require oblique pressing of steel pipes. For example, the patent document entitled "A Recyclable Vertical Steel Pipe Front Support Enclosure Structure and Its Application Method" with publication date of 2013.11.27 and publication number CN103410456A, is difficult to press into steel pipes in hard soil areas, and often results in difficulties in pressing in and strength damage, which affects the construction quality and subsequent foundation pit safety. During construction, oblique drilling is often used to drive the steel pipes in, which is difficult to construct and inefficient. In addition, drilling causes stress release in the surrounding soil. If the grouting effect is not good, the bearing capacity of the steel pipe may not meet the design requirements.

[0003] Based on the above problems, there is currently a lack of a support structure that can solve the problem that steel pipes are difficult to press in. Summary of the invention

[0004] The utility model aims to provide a rigid composite inclined pile support structure, which utilizes the vertical hole grouting method to temporarily loosen the hard soil layer to facilitate the construction of steel pipes, and the hole grouting reinforcement forms a reinforcement body, which can greatly improve the bearing capacity of the steel pipe.

[0005] The utility model specifically adopts the following technical solutions:

[0006] A rigid composite inclined pile support structure comprises a retaining structure 2 and inclined piles 3, characterized in that: a purlin 1 is arranged on the top of the retaining structure 2, one end of the inclined pile 3 is connected to the purlin 1, and the other end extends into a cement reinforcement body 4 in the soil in the foundation pit; the cement reinforcement body 4 presents a block structure after solidification; the cement reinforcement body 4 is formed by drilling a vertical hole into the soil through a mixing drilling and grouting equipment and then grouting into the hard soil layer.

[0007] Preferably, the purlin 1 is a concrete purlin.

[0008] Preferably, the hard soil layer includes an old clay layer and a silty clay layer from top to bottom.

[0009] Preferably, the retaining structure 2 is one or a combination of cast-in-place piles, construction piles, and prefabricated piles.

[0010] Preferably, the inclined piles 3 are one or a combination of steel pipes, precast concrete piles, and steel sections.

[0011] Furthermore, the enclosure structure 2 is a pile injection gantry or a construction method gantry.

[0012] The beneficial effects of the utility model are:

[0013] 1) Vertical hole grouting reinforcement forms a cement reinforcement body, which can greatly improve the bearing capacity of the inclined pile.

[0014] 2) By using the vertical hole grouting method, the hard soil layer can be grouted and the hard soil layer can be temporarily loosened to facilitate the construction of inclined piles (such as steel pipe piles), achieving a technical effect of killing two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic elevation diagram of the rigid composite inclined pile support structure of the utility model.

[0016] Figure 2 It is a schematic diagram of step (a) of the implementation process of the utility model.

[0017] Figure 3 It is a schematic diagram of step (b) of the implementation process of the utility model.

[0018] Figure 4 It is a schematic diagram of step (c) of the implementation process of the utility model.

[0019] Figure 5 It is a schematic diagram of step (d) of the implementation process of the utility model.

[0020] In the figure, 1. purlin, 2. retaining structure, 3. inclined piles, 4. cement reinforcement. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] A rigid composite inclined pile support structure, comprising a retaining structure 2 and inclined piles 3, characterized in that: a purlin 1 is arranged on the top of the retaining structure 2, one end of the inclined pile 3 is connected to the purlin 1, and the other end extends into a cement reinforcement body 4 in the soil in the foundation pit; the cement reinforcement body 4 is a block structure after solidification; the cement reinforcement body 4 is formed by grouting into the hard soil layer after vertically drilling into the soil by a mixing drilling and grouting equipment. The cement soil reinforcement body 4 is arranged in the hard soil layer, and the soil can be firstly loosened to facilitate the insertion of the inclined pile 3. After the reinforcement body 4 is hardened, it can provide sufficient bearing capacity for the inclined pile 3.

[0023] In this embodiment, see Figure 1-5 The hard soil layer includes an old clay layer and a silty clay layer from top to bottom.

[0024] In this embodiment, the retaining structure 2 is a cast-in-place pile. It is foreseeable that it can also be a method pile, a prefabricated pile, or a combination of the two, such as a cast-in-place pile gantry and a method gantry.

[0025] In this embodiment, the inclined piles 3 are steel pipes, but can also be precast concrete piles, steel sections, or a combination thereof.

[0026] It should be noted that, in this embodiment, the purlin 1 is generally a concrete purlin, but is not limited to concrete, and may also be a steel purlin, for example.

[0027] Construction process:

[0028] Step a: Figure 2 As shown, after the site is leveled, the retaining structure 2 and the cement reinforcement body 4 are constructed first. The retaining structure 2 can be a cast-in-place pile, a construction pile, or a prefabricated pile, and can be constructed using a drilling rig, a rotary drilling machine, a punching machine, a three-axis machine, etc.; the reinforcement body 4 can be constructed using methods such as a double-axis, a three-axis, a four-axis, a five-axis, and a rotary spraying method; the reinforcement body 4 is constructed on a hard soil layer (which can be old clay, silty clay, etc.), and the soil is loosened and sprayed during construction;

[0029] Step b: Figure 3 As shown, the inclined pile 3 is constructed in time before the slurry of the reinforcement body 4 solidifies to avoid difficulties in the construction of the inclined pile 3 after the cement reinforcement body 4 hardens; the inclined pile 3 can be inserted into the soil by using equipment such as a driving machine and reach the position of the cement reinforcement body, and can also pass through the cement reinforcement body (not shown in the figure).

[0030] Step c: Figure 4 As shown, the purlin 1 is constructed to form a whole with the enclosure structure 2 and the inclined piles 3;

[0031] Step d: Figure 5 As shown, excavate the foundation pit to the designed elevation.

[0032] The utility model uses vertical hole grouting to reinforce and form a cement reinforcement body, which can greatly improve the bearing capacity of the inclined pile. The vertical hole grouting method can not only realize grouting of the hard soil layer, but also temporarily loosen the hard soil layer, which is convenient for the construction of inclined piles (such as steel pipe piles), achieving a technical effect of killing two birds with one stone.

[0033] The above are preferred embodiments of the present invention. Ordinary technicians in this field can also make various changes or improvements on this basis. Without departing from the overall concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.

Claims

1. A rigid composite inclined pile support structure, comprising a retaining structure (2) and inclined piles (3), characterized in that: A purlin (1) is provided on the top of the enclosure structure (2); one end of the inclined pile (3) is connected to the purlin (1), and the other end extends into a cement reinforcement body (4) in the soil in the foundation pit; the cement reinforcement body (4) is a block structure after solidification; the cement reinforcement body (4) is formed by drilling a vertical hole into the soil through a mixing drilling and grouting device and then grouting into the hard soil layer.

2. The rigid composite inclined pile support structure according to claim 1, characterized in that: The enclosure purlin (1) is a concrete enclosure purlin.

3. The rigid composite inclined pile support structure according to claim 1, characterized in that: The hard soil layer includes an old clay layer and a silty clay layer from top to bottom.

4. The rigid composite inclined pile support structure according to claim 1, characterized in that: The enclosure structure (2) is one or a combination of cast-in-place piles, construction piles, and prefabricated piles.

5. The rigid composite inclined pile support structure according to claim 1, characterized in that: The inclined pile (3) is one or a combination of a steel pipe, a precast concrete pile, and a steel section.

6. The rigid composite inclined pile support structure according to claim 4, characterized in that: The enclosure structure (2) is a pile injection gantry or a construction method gantry.

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