A square pile foundation structure for prefabricated cabin and construction method

Abstract

The present invention belongs to the field of new energy technology, and particularly relates to a square pile foundation structure and construction method for prefabricated cabins. The structure includes a plurality of prestressed square piles, which are square piles with grooves on the upper side for inserting side panels, and the lower part for burying in rock and soil; the width of the groove is greater than the width of the side panel; the side panel is arranged between the grooves of two prestressed square piles; and a welding plate is arranged on the top of the prestressed square pile. By anchoring the prestressed square piles into the rock and soil, a larger pull-out resistance and compression resistance are generated to resist the load transmitted from the upper part; there is no need to carry out pile foundation construction separately; the prestressed square piles and the side panels are connected and fixed by the grooves, which effectively improves the integrity of the two; the internal space formed fully meets the requirements for arranging cables.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy, and in particular relates to a square pile foundation structure for a prefabricated cabin and a construction method. Background Art

[0002] As the construction period requirements for wind power generation projects and photovoltaic power generation projects become increasingly stringent, the construction period needs to be continuously shortened. In substations, more and more prefabricated cabins are being used to replace buildings to shorten the construction period of the superstructure.

[0003] However, the foundation of prefabricated cabins is usually cast-in-place concrete, which requires formwork, steel bar binding, and concrete curing, so the cycle cannot meet the requirements. From a safety perspective, the original cast-in-place concrete often has concrete cracks and the quality cannot be guaranteed. On the weak foundation, piling is also required, which increases the construction process and the construction cycle. Summary of the invention

[0004] In view of the problem of long construction period caused by using cast-in-place concrete foundation in the prior art, the present invention provides a prestressed square pile foundation structure for a prefabricated cabin and a construction method.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] In the first aspect, the present invention provides a square pile foundation structure for a prefabricated cabin, comprising a plurality of prestressed square piles, wherein a groove is provided on the upper side for inserting a side plate, and the lower part is used for embedding in rock and soil; the width of the groove is greater than the width of the side plate; the side plate is arranged between the grooves of two prestressed square piles; and a welding plate is provided on the top of the prestressed square pile.

[0007] Furthermore, the prestressed square piles and the side plates are provided with a plurality of holes, the holes comprising a first hole through-opened on the side of the prestressed square pile and a second hole through-opened along the length direction of the side plate, the first hole and the second hole are horizontally aligned and pass through a prestressed anchor cable.

[0008] Furthermore, an anchor is provided outside the hole for fixing the prestressed anchor cable.

[0009] Furthermore, a bonding grouting body is injected into the gap between the joint part of the prestressed square pile and the side plate.

[0010] Furthermore, the side panels are provided with ventilation holes.

[0011] Furthermore, the diameter of the prestressed square pile is 300 mm to 1000 mm, the length of the groove is 1 m to 3 m, and the thickness of the side plate is 100 to 350 mm.

[0012] Furthermore, when the rock and soil body is rock geology, the length of the lower part for burying the rock and soil body is greater than or equal to 0.5m;

[0013] When the rock and soil mass is soft soil, the length of the lower portion for burying the rock and soil mass is greater than 1 m.

[0014] Furthermore, the prestressed anchor cable has a diameter of 8 mm to 28 mm and a yield strength of 215 to 355 N / mm 2 Ribbed anchor cable.

[0015] Furthermore, the size of the ventilation opening is 300*500mm.

[0016] In a second aspect, the present invention provides a construction method for a square pile foundation structure for a prefabricated cabin, based on the square pile foundation structure for a prefabricated cabin, comprising the following steps:

[0017] S1: Position and lay out the construction site, determine the piling position, and drive the lower part of the prestressed square pile into the rock and soil using a pile driver;

[0018] S2: inserting the side plate into the groove on the upper side of the prestressed square pile and aligning the holes;

[0019] S3: inserting the prestressed anchor cable into the hole;

[0020] S4: fixing the prestressed anchor cable by an anchor;

[0021] S5: performing grouting treatment on the pores of the joint part of the prestressed square pile and the side plate to form a bonding grouting body;

[0022] S6: tensioning the two ends of the prestressed anchor cable.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] First, by anchoring the prestressed square piles into the rock and soil, a larger pull-out force and pressure resistance are generated to resist the load transmitted from the upper part. There is no need for separate pile foundation construction, which greatly shortens the construction period. The prestressed square piles and the side plates are connected and fixed by grooves, which effectively improves the integrity of the two. The internal space formed can fully meet the requirements for cable layout.

[0025] Second, the prestressed anchor cable is set throughout the length, which provides good integrity and avoids the occurrence of cracks after prestressing.

[0026] Third, grouting treatment is carried out to further improve the integrity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] In the attached picture:

[0029] Figure 1 A three-dimensional diagram of a square pile foundation structure for a prefabricated cabin according to the present invention;

[0030] Figure 2 A schematic diagram of holes in a square pile foundation structure for a prefabricated cabin according to the present invention;

[0031] Figure 3 A schematic diagram of a groove of a square pile foundation structure for a prefabricated cabin according to the present invention;

[0032] In the figure: 1-prestressed square pile; 2-side plate; 3-embedded steel plate; 4-hole; 5-prestressed anchor cable; 6-groove; 7-grouting reinforcement body; 8-anchor; 9-ventilation hole. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0034] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, a square pile foundation structure for a prefabricated cabin includes prestressed square piles 1 and side plates 2.

[0037] The diameter of the prestressed square pile 1 is generally 300mm~1000mm, and it is divided into two parts along the length direction. The upper part is combined with the side plate 2, and the length of the combined part is generally 1~3m. The lower part is buried in the rock and soil body. The length buried in the lower rock and soil body is determined by the geological properties of the rock and soil body. When it is rock geology, the anchoring length is greater than or equal to 0.5m; when it is soft soil geology, the anchoring length is greater than 1m.

[0038] The side plate 2 is made of a reinforced concrete material with a concrete strength between C30 and C60, and the thickness is generally 100 to 350 mm.

[0039] A welding plate 3 is embedded in the top of the prestressed square pile 1. The welding plate 3 is a steel plate and is used for welding with the upper prefabricated cabin.

[0040] like Figure 3 As shown, there is a groove 6 on the side of the prestressed square pile 1, the width of the groove 6 is greater than the width of the side plate 2, and the side plate 2 is inserted into the groove 6 to complete the preliminary fixation of the prestressed square pile 1 and the side plate 2. Grouting is required in the groove 6 to form a grouting reinforcement body 7 to complete the secondary fixation. The upper surface of the grouting reinforcement body 7 is flush with the upper surface of the prestressed square pile 1, the compressive strength is greater than or equal to 60 MPa, the fluidity is greater than 340 mm, and the 3h vertical expansion rate is between 0.1 and 3.5.

[0041] like Figure 2 As shown, the prestressed square pile 1 and the side plate 2 reserve a plurality of holes 4, the holes 4 include a first hole through-type opening on the side of the prestressed square pile 1 and a second hole through-type opening on the side plate 2 along the length direction, the first hole and the second hole are horizontally aligned, the prestressed anchor cable 5 passes through the first hole and the second hole, the two ends of the prestressed anchor cable 5 are fixed by anchors 8, and after being fixed, prestress is applied to the prestressed anchor cable 5, so that the prestressed square pile 1 and the side plate 2 are tightly connected, and the prestressed anchor cable 5 adopts a ribbed anchor cable with a diameter of 8mm to 28mm, and a yield strength of 215 to 355N / mm 2 .

[0042] By arranging a plurality of prestressed square piles 1 and side plates 2, at least one internal space is formed. The internal space is formed into a long strip pile for primary and secondary cable passing.

[0043] like Figure 1 As shown, the outermost side panel 2 is provided with a vent 9, and the size of the vent 9 is generally 300*500mm.

[0044] The height of the square pile foundation structure for a prefabricated cabin above the ground can be adjusted according to demand, and is generally 0.3m to 2.5m.

[0045] Example 2

[0046] The present invention provides a method for constructing a square pile foundation structure for a prefabricated cabin, comprising the following steps:

[0047] Step 1: Locate and lay out the lines at the construction site, determine the location for piling, and drive the prestressed square piles into the rock and soil using a pile driver;

[0048] Step 2: Insert the side plate 2 into the groove 6 to complete the preliminary fixation of the prestressed square pile 1 and the side plate 2;

[0049] Step 3: insert the prestressed anchor cable 5 into the corresponding holes 4 of the prestressed square pile 1 and the side plate 2;

[0050] Step 4: Fixing the two ends of the prestressed anchor cable 5 by means of the anchor 8;

[0051] Step 5: Grouting the gap between the prestressed square pile 1 and the side plate 2 to form a bonding grouting body 7;

[0052] Step 6: tensioning the two ends of the prestressed anchor cable 5.

[0053] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A square pile foundation structure for a prefabricated cabin, characterized in that: It comprises a plurality of prestressed square piles (1), the upper side of which is provided with a groove (6) for inserting a side plate (2), and the lower part of which is used to be buried in rock and soil; the width of the groove (6) is greater than the width of the side plate (2); the side plate (2) is arranged between the grooves (6) of two prestressed square piles (1); and a welding plate (3) is provided on the top of the prestressed square pile (1); The prestressed square pile (1) and the side plate (2) are provided with a plurality of holes (4), the holes (4) comprising a first hole provided through the side of the prestressed square pile (1) and a second hole provided through the side plate (2) along the length direction, the first hole and the second hole being horizontally aligned and having a prestressed anchor cable (5) passing therethrough; The hole (4) is provided with an anchor (8) outside for fixing the prestressed anchor cable (5); A bonding grouting body (7) is injected into the gap between the joint portion of the prestressed square pile (1) and the side plate (2).

2. The square pile foundation structure for prefabricated cabin according to claim 1, characterized in that: The side plate (2) is provided with a ventilation opening (9).

3. The square pile foundation structure for prefabricated cabin according to claim 2, characterized in that: The size of the ventilation opening (9) is 300*500 mm.

4. The square pile foundation structure for prefabricated cabin according to claim 1, characterized in that: The diameter of the prestressed square pile (1) is 300 mm to 1000 mm, the length of the groove (6) is 1 m to 3 m, and the thickness of the side plate (2) is 100 mm to 350 mm.

5. The square pile foundation structure for prefabricated cabin according to claim 1, characterized in that: When the rock and soil body is rock geology, the length of the lower part used to bury the rock and soil body is greater than or equal to 0.5m; When the rock and soil mass is soft soil, the length of the lower portion for burying the rock and soil mass is greater than 1 m.

6. The square pile foundation structure for prefabricated cabin according to claim 1, characterized in that: The prestressed anchor cable (5) has a diameter of 8 mm to 28 mm and a yield strength of 215 to 355 N / mm 2 Ribbed anchor cable.

7. A construction method for a square pile foundation structure for a prefabricated cabin, based on the square pile foundation structure for a prefabricated cabin according to claim 1, characterized in that: The steps include: S1: Positioning and laying out the lines at the construction site, determining the location for piling, and driving the lower part of the prestressed square pile (1) into the rock and soil using a pile driver; S2: inserting the side plate (2) into the groove (6) on the upper side of the prestressed square pile (1), and aligning the holes (4); S3: inserting the prestressed anchor cable (5) into the hole (4); S4: fixing the prestressed anchor cable (5) by means of an anchor (8); S5: performing grouting treatment on the pores of the joint portion of the prestressed square pile (1) and the side plate (2) to form a bonding grouting body (7); S6: tensioning the two ends of the prestressed anchor cable (5).

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