Foundation pit supporting device

Abstract

The invention discloses a foundation pit supporting device which comprises a supporting plate vertically arranged along the periphery of a foundation pit and close to rock soil. The bottom plate is laid at the bottom of the foundation pit along the periphery of the foundation pit and close to the supporting plate; the expansion type anchor rod comprises a column body, a guide body, a nut and a steel bar, a through hole is coaxially formed in the middle of the column body, the expansion type anchor rod penetrates through the supporting plate from the interior of the foundation pit to be inserted into rock soil, the nut is screwed to the end, located in the foundation pit, of the column body, and the guide body is arranged at the end, located in the rock soil, of the column body. The guide body is arranged at the center of the through hole, the outer wall of the guide body is fixedly connected with the column body through a plurality of connecting rods, so that a plurality of steel bar channels are formed between the guide body and the column body, and the steel bars penetrate out of the steel bar channels to be inserted into rock soil. Through the barbs of the steel bars of the expansion type anchor rod, the contact points of the divergent steel bars and rock soil can be more divergent, the supporting plate and the rock soil are more firmly anchored, and foundation pit rock soil collapse is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a foundation pit supporting device. Background Art

[0002] Foundation pit support refers to the measures of support, reinforcement and protection of the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. Among them, anchor support is a commonly used support method. Anchor support is an overall stable rock support belt formed on the side walls of the deep foundation pit by anchoring the anchor rods into the surrounding rock, so as to achieve the purpose of maintaining the stability of the foundation pit.

[0003] The existing foundation pit support device generally includes a support plate installed on the side wall of the foundation pit and an anchor rod that nails the support plate to the side wall of the foundation pit. However, for soft strata, simply driving the anchor rod into the rock and soil cannot effectively prevent the rock and soil from collapsing. Therefore, it is necessary to further improve the structure of the anchor rod anchoring to improve the stability of the anchoring. Summary of the invention

[0004] The present invention provides a foundation pit supporting device, comprising:

[0005] The support plate is set vertically along the perimeter of the foundation pit next to the rock and soil;

[0006] The bottom plate is laid at the bottom of the foundation pit along the perimeter of the foundation pit next to the supporting plate;

[0007] The expansion anchor includes a column, a guide body, a nut and a steel bar. A through hole is coaxially arranged in the middle of the column. The expansion anchor is inserted into the rock and soil from the inside of the foundation pit through the supporting plate. The nut is screwed on one end of the column located in the foundation pit.

[0008] A guide body is provided at one end of the column located in the rock and soil. The guide body is arranged at the center of the through hole. The outer wall of the guide body is fixedly connected to the column through multiple connecting rods, thereby forming multiple steel bar channels between the guide body and the column, and the steel bars pass through the steel bar channels and are inserted into the rock and soil.

[0009] Optionally, the diameter of the guide body gradually increases in a direction away from the cylinder, and an end of the guide body close to the cylinder has an arc.

[0010] Optionally, a grouting hole is provided on the guide body, and the grouting hole is connected to the through hole.

[0011] Optionally, the end of the steel bar for inserting into rock and soil is a rounded tip.

[0012] Optionally, barbs are further provided on the periphery of the steel bar passage through which the steel bar passes, and the barbs are obliquely extended from the outer wall of the steel bar in a direction opposite to the direction of insertion into the rock and soil.

[0013] Optionally, a plurality of telescopic spikes are provided on the side wall of the column, and an outlet hole is provided on the side wall of the column. The tip of the telescopic spike is slidably installed in the outlet hole toward the outside. When the column is inserted into the rock and soil, the telescopic spike retracts into the column under the thrust of the rock and soil. When grouting is performed through the through hole, the grouting pressure causes the column to expand into a circle, and under the action of the grouting pressure, the telescopic spike extends outward from the outlet hole and is inserted into the rock and soil.

[0014] Optionally, the telescopic cone thorns are symmetrically arranged in pairs, and when the telescopic cone thorns are retracted into the column, the ends of the telescopic cone thorns that are close to each other contact each other and are staggered.

[0015] Optionally, a rib plate is connected between the base plate and the support plate.

[0016] Optionally, an anti-slip key is provided at the bottom of the base plate.

[0017] Optionally, adjacent supporting plates are connected together by pouring concrete; adjacent base plates are connected together by pouring concrete.

[0018] The foundation pit supporting device of the present invention has the following beneficial effects:

[0019] The barbs of the expansion anchor rod's steel bars can make the contact points between the divergent steel bars and the rock and soil more divergent, so that the support plate and the rock and soil are more firmly anchored, thus preventing the collapse of the foundation pit rock and soil.

[0020] After the expansion anchor grouting treatment, the slurry solidifies and combines more firmly with the steel bars and barbs of the expansion anchor, which can further strengthen the connection between the support plate and the rock and soil and improve the stability of the foundation pit support.

[0021] By inserting the telescopic cone into the rock and soil, the anchoring degree with the rock and soil can be further improved, and the anchoring degree of the anchor rod can be comprehensively improved.

[0022] The telescopic cone thorns are symmetrically arranged in pairs, and the ends of the telescopic cone thorns that are close to each other are in contact with each other and staggered. The structure is simple and the telescopic operation can be effectively completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above-mentioned features and technical advantages of the present invention will become clearer and easier to understand by describing its embodiments in conjunction with the following drawings.

[0024] Figure 1 It is a schematic diagram of a foundation pit supporting device according to an embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of an expansion anchor rod according to an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the barb of the expansion anchor rod according to an embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of the telescopic cone spike according to an embodiment of the present application.

[0028] Figure 5 It is a schematic diagram of the telescopic cone thorn extending into rock and soil according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be described below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of the claims. In addition, in this specification, the drawings are not drawn to scale and the same reference numerals represent the same parts.

[0030] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inner", "outer", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] The present application provides a foundation pit supporting device, including a supporting plate 3, which is vertically arranged along the circumference of the foundation pit next to the rock and soil; a bottom plate 1, which is horizontally arranged at the bottom of the foundation pit next to the supporting plate 3 along the circumference of the foundation pit; and an expansion anchor rod 4, which passes through the supporting plate 3 from one side inside the foundation pit and is inserted deep into the rock and soil.

[0032] The support plates 3 play a major bearing role. Multiple support plates 3 may be arranged along the circumference of the foundation pit. The support plates 3 are arranged vertically so as to completely cover the rock and soil around the foundation pit. Adjacent support plates 3 are connected together by pouring concrete, so that all support plates 3 are tightly connected.

[0033] For example, if the foundation pit is square, support plates 3 may be provided on all four sides, and adjacent support plates 3 may be connected together by pouring concrete.

[0034] Multiple bottom plates 1 may be arranged around the foundation pit, and each bottom plate may be laid next to the supporting plate 3. A circle of bottom plates 1 may be laid around the foundation pit, and adjacent bottom plates 1 may also be connected together by pouring concrete, so that all bottom plates 1 are tightly connected.

[0035] The expansion anchor rod 4 includes a column 8, a guide body 5, a nut 6, and a steel bar 7. The column 8 is hollow and flat, and a through hole 9 is coaxially opened in the middle. A nut 6 is arranged at one end of the column 8, and the nut 6 can be screwed on the column by a thread. When the column 8 is inserted into the support plate 3 and the rock and soil surface 10, the nut 6 is stuck on the side of the support plate 3 located inside the foundation pit.

[0036] A guide body 5 is provided at the other end of the column 8. The guide body 5 is provided at the center of the through hole 9. An annular channel is formed between the guide body 5 and the column 8. The outer wall of the guide body 5 is fixedly connected to the column 8 by a plurality of connecting rods 13. Thus, the annular channel between the guide body 5 and the column 8 is divided into a plurality of hollow holes, and the hollow holes serve as steel bar channels 12. The steel bar 7 can be inserted into the through hole 9, and the steel bar 7 can be passed out of the steel bar channel 12. When the expansion anchor rod 4 is inserted into the rock and soil, the steel bar 7 is also inserted into the rock and soil. More specifically, after the column 8 is inserted into the rock and soil, the steel bar 7 is passed out of the steel bar channel 12 and inserted into the rock and soil, and the nut 6 is stuck on the side of the support plate 3 located inside the foundation pit.

[0037] The guide body 5 may be conical, specifically, the diameter gradually increases in the direction away from the column 8, so that the steel bar channel 12 is inclined from the inside to the outside. When the steel bar 7 is inserted into the steel bar channel 12, it can be bent outward along the inclined steel bar channel 12, so that it can be inserted into the rock and soil at a bent angle. Multiple steel bars are inserted into the rock and soil in a scattered state, which can prevent the rock and soil from loosening and make the anchoring more stable. In addition, the end of the guide body 5 close to the column 8 has an arc, so that the steel bar can slide into the steel bar channel 12 along the arc when inserted.

[0038] Furthermore, a barb 701 is further provided on the outer periphery of the steel bar 7 passing through the steel bar passage 12. The barb 701 can make the front end of the steel bar more firmly embedded in the rock and soil after the steel bar 7 is inserted into the rock and soil. The barb 701 is obliquely extended from the outer wall of the steel bar 7 in the direction opposite to the direction of insertion into the rock and soil, and the barb 701 can be integrally formed with the steel bar 7. It can further prevent the rock and soil from loosening, making the anchoring more stable.

[0039] Moreover, the size of the steel bar with the barb 701 can be smaller than the size of the steel bar channel 12, so that the steel bar with the barb can easily pass through the steel bar channel 12. It can also be slightly larger than the size of the steel bar channel 12, and the barb 701 can be knocked to pass through the steel bar channel 12, and after the barb 701 passes through the steel bar channel 12, the barb 701 is stuck on the outside of the steel bar channel 12, which further strengthens the anchoring degree of the entire support device.

[0040] In some embodiments, a grouting hole 51 may be provided on the guide body, the grouting hole 51 is connected to the through hole 9, and grouting may be injected into the rock and soil through the through hole 9 and the grouting hole 51 to strengthen the anchoring degree of the anchor rod. Grouting may be performed after the steel bar 7 is inserted into the anchor rod.

[0041] Furthermore, a plurality of telescopic cone spikes 81 are provided on the side wall of the column 8, and the telescopic cone spikes 81 can be cone-shaped, such as a circular cone or a square cone. A through hole 82 is provided on the inner wall of the column 8, and the tip of the telescopic cone spike extends outward from the through hole 82, and the telescopic cone spike 81 can slide in the through hole 82. When the column 8 is inserted into the rock and soil, the telescopic cone spike retracts into the column 8 under the thrust of the rock and soil. When grouting is performed through the through hole 9, the grouting pressure causes the column 8 to expand into a circle, and under the action of the grouting pressure, the telescopic cone spike 81 extends outward from the through hole 82 and is inserted into the rock and soil. In addition, the telescopic cone spikes are arranged symmetrically in pairs, so that when retracting into the column 8, the telescopic cone spikes abut against each other, and will not completely retract into the column 8 and fall off. When the telescopic cone thorns are retracted into the column 8, the ends of the telescopic cone thorns that are close to each other contact each other and staggered, so that the grouting pressure can act on the paired telescopic cone thorns respectively. By inserting the telescopic cone thorns 81 into the rock and soil, the degree of anchoring with the rock and soil can be further improved. By the lateral anchoring of the telescopic cone thorns and the anchoring of the steel bars at the ends, combined with the grouting holes into the rock and soil, the anchor rod can be fully fixed to the rock and soil, and the anchoring degree of the anchor rod can be fully improved.

[0042] It should be noted that the mutually contacting and staggered ends of the telescopic cone thorns mentioned above are merely exemplary, and the telescopic cone thorns may not be arranged in pairs, but may be multiple distributed on the side wall of the column 8, with the length of each telescopic cone thorn being greater than the inner diameter of the column 8 but smaller than the outer diameter of the column 8, so that the telescopic cone thorn will not fall off from the through hole 82 when retracted, and can extend beyond the outer wall of the column 8 when extended under the action of grouting pressure.

[0043] Moreover, the end portion of the steel bar 7 for inserting into rock and soil may be a rounded tip 702 to facilitate the insertion of the steel bar 7 .

[0044] In some embodiments, a rib plate 2 is further connected between the base plate 1 and the support plate 3 .

[0045] In some embodiments, an anti-slip key 11 is provided at the bottom of the base plate 1. The anti-slip key 11 directly acts on the base to enhance the anti-displacement capability of the bottom and increase the reliability of the supporting device.

[0046] The working principle of this embodiment:

[0047] During construction, the support plate 3 and the bottom plate 1 are installed along the perimeter of the foundation pit, and the expansion anchor rod 4 is installed in the reserved drill hole in time during the excavation of the foundation pit. When installing the expansion anchor rod 4, the column 8 is passed through the support plate 3 from one side inside the foundation pit. Then, the steel bar 7 is inserted into the column 8 through the through hole 9. After the steel bar 7 passes through the through hole 9 and reaches one end of the guide body 5, it passes through the column 8 along the conical surface of the guide body 5 and the steel bar channel 12, spreads around and is inserted into the soil. In addition, due to the effect of the barb, the rock and soil can be prevented from loosening, making the anchoring more stable.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foundation pit support device, characterized in that: include: The support plate is set vertically along the perimeter of the foundation pit next to the rock and soil; The bottom plate is laid at the bottom of the foundation pit along the perimeter of the foundation pit next to the supporting plate; The expansion anchor includes a column, a guide body, a nut and a steel bar. A through hole is coaxially arranged in the middle of the column. The expansion anchor is inserted into the rock and soil from the inside of the foundation pit through the supporting plate. The nut is screwed on one end of the column located in the foundation pit. A guide body is provided at one end of the column located in the rock and soil. The guide body is arranged at the center of the through hole. The outer wall of the guide body is fixedly connected to the column through multiple connecting rods, thereby forming multiple steel bar channels between the guide body and the column, and the steel bars pass through the steel bar channels and are inserted into the rock and soil.

2. The foundation pit supporting device according to claim 1, characterized in that: The diameter of the guide body gradually increases in a direction away from the column, and one end of the guide body close to the column has an arc.

3. The foundation pit supporting device according to claim 1, characterized in that: A grouting hole is arranged on the guide body, and the grouting hole is communicated with the through hole.

4. The foundation pit supporting device according to claim 1, characterized in that: The end of the steel bar for inserting into rock soil is a rounded tip.

5. The foundation pit supporting device according to claim 1, characterized in that: Barbs are also arranged on the periphery of the steel bar passage through which the steel bar passes. The barbs are obliquely extended from the outer wall of the steel bar in a direction opposite to the direction of insertion into the rock and soil.

6. The foundation pit supporting device according to claim 4, characterized in that: A plurality of telescopic spikes are arranged on the side wall of the column, and a through hole is arranged on the side wall of the column. The tip of the telescopic spike is slidably installed in the through hole toward the outside. When the column is inserted into the rock and soil, the telescopic spike retracts into the column under the thrust of the rock and soil. When grouting is performed through the through hole, the grouting pressure causes the column to expand into a circle, and under the action of the grouting pressure, the telescopic spike extends outward from the through hole and is inserted into the rock and soil.

7. The foundation pit supporting device according to claim 6, characterized in that: The telescopic cone thorns are symmetrically arranged in pairs, and when the telescopic cone thorns are retracted into the column, the ends of the telescopic cone thorns that are close to each other contact with each other and are staggered.

8. The foundation pit supporting device according to claim 1, characterized in that: A rib plate is also connected between the bottom plate and the supporting plate.

9. The foundation pit supporting device according to claim 1, characterized in that: An anti-slip key is arranged at the bottom of the base plate.

10. The foundation pit supporting device according to claim 1, characterized in that: Adjacent supporting plates are connected together by pouring concrete; adjacent base plates are connected together by pouring concrete.

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