Gravity type retaining wall composite foundation structure

Abstract

The utility model provides a composite foundation structure of a gravity retaining wall, which relates to the field of engineering support and comprises an anchoring steel pipe, the anchoring steel pipe comprises a first part and a second part, the second part is positioned below the first part, and the second part is arranged in a hole of a foundation; and the first part is arranged in the gravity type retaining wall. The upper parts of the anchoring steel pipes are fixed in the gravity retaining wall, and the lower parts of the anchoring steel pipes are fixed in the foundation, so that a composite structure is formed, and the overall bearing capacity and the anti-overturning capacity are remarkably enhanced.

Description

Technical Field

[0001] The utility model relates to the field of engineering support, and in particular to a gravity retaining wall composite foundation structure. Background Art

[0002] A gravity retaining wall is a slope support structure that relies on the friction between its own gravity and the foundation to provide anti-slip force. However, due to the poor strata in some sites, the bearing capacity and friction coefficient of the foundation are relatively small, making the anti-slip force provided by the gravity retaining wall relatively small. If only general treatment is performed on the foundation, the increase in anti-slip force is also limited, and it is difficult to meet the requirements of the code for anti-overturning. Therefore, strong support measures such as anti-slip piles are needed, which will greatly increase construction costs and construction period. Summary of the Invention

[0003] The purpose of this utility model is to provide a gravity retaining wall composite foundation structure to solve the above problems. In order to achieve the above purpose, the technical solutions adopted by this utility model are as follows:

[0004] The present application provides a gravity retaining wall composite foundation structure, comprising:

[0005] An anchoring steel pipe, the anchoring steel pipe comprising a first portion and a second portion, the second portion being located below the first portion and disposed in a hole in the foundation;

[0006] Gravity retaining wall, the first part is arranged in the gravity retaining wall.

[0007] Furthermore, a steel plate is sleeved on one end of the first part located inside the gravity retaining wall, and the steel plate is fixedly connected to the first part via a plurality of triangular rib steel plates.

[0008] Furthermore, a positioning bracket group and a grouting hole group are provided on the second part, the positioning bracket group includes multiple positioning brackets, the positioning brackets in the same positioning bracket group are located at the same height, the positioning brackets in the positioning bracket group are located outside the second part and are symmetrically distributed, the grouting hole group includes multiple grouting holes, the grouting holes in the same grouting hole group are located at the same height, and the grouting holes in the grouting hole group are opened on the second part and are symmetrically distributed.

[0009] Furthermore, the gravity retaining wall composite foundation structure includes a concrete cushion layer, which is arranged between the gravity retaining wall and the foundation, and the first part passes through the concrete cushion layer and is fixedly connected to the gravity retaining wall.

[0010] Furthermore, a grouting plug is provided between one end of the second part close to the concrete cushion layer and the inner wall of the hole of the foundation.

[0011] Furthermore, an end of the second part away from the concrete cushion layer is provided with obliquely arranged supporting ribs.

[0012] Furthermore, the number of the triangular rib steel plates is 4, and the multiple triangular rib steel plates are arranged on the outside of the first part and are symmetrically distributed, and the shape of the steel plates is square.

[0013] Furthermore, the number of positioning brackets in the positioning bracket group is 3, and the number of grouting holes in the grouting hole group is 2.

[0014] Furthermore, the number of the plurality of positioning bracket groups and the plurality of grouting hole groups is related to the length of the second portion.

[0015] Furthermore, the diameter of the anchoring steel pipe is 108 mm, the wall thickness of the anchoring steel pipe is 6 mm, and the material of the anchoring steel pipe is galvanized steel pipe.

[0016] The beneficial effects of the utility model are:

[0017] The utility model forms a composite structure by fixing the upper portion of the anchor steel pipe in the gravity retaining wall and the lower portion in the foundation, thereby significantly enhancing the overall bearing capacity and anti-overturning capacity.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the composite foundation structure of the gravity retaining wall described in the utility model;

[0021] Figure 2 This is a schematic structural diagram of the enlarged head described in the utility model;

[0022] Figure 3 This is a schematic diagram of the AA cross-sectional structure of the present utility model;

[0023] Figure 4This is a schematic diagram of the BB cross-section structure of the present utility model;

[0024] Figure 5 This is a complete structural diagram of the gravity retaining wall composite foundation structure described in the present utility model.

[0025] Markings in the figure: 1. Steel plate; 2. Triangular rib steel plate; 3. Anchor steel pipe; 4. Gravity retaining wall; 5. Grouting plug; 6. Hole; 7. Positioning bracket; 8. Support rib; 9. Drain hole; 10. Concrete cushion; 11. Grouting reinforcement boundary; 12. Grouting hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0028] Example 1:

[0029] like Figure 1 As shown, this embodiment provides a gravity retaining wall composite foundation structure, including:

[0030] Anchoring steel pipe 3, the anchoring steel pipe 3 includes a first portion and a second portion, the second portion is located below the first portion, and the second portion is arranged in the hole 6 of the foundation;

[0031] The gravity retaining wall 4, wherein the first portion is disposed within the gravity retaining wall 4;

[0032] In the embodiment of the present application, the lower half of the anchoring steel pipe 3, i.e., the second part, is fixed in the foundation, and the lower half of the anchoring steel pipe 3, i.e., the first part, is fixed in the gravity retaining wall 4. The pull-out force generated thereby improves the anti-overturning ability of the gravity retaining wall 4, and the cross-sectional size of the gravity retaining wall 4 can be appropriately reduced, thereby reducing the area occupied and saving engineering costs.

[0033] The first part is located at one end of the gravity retaining wall 4 and is sleeved with a steel plate 1. The steel plate 1 is fixedly connected to the first part by a plurality of triangular rib steel plates 2. Figure 2 As shown, an enlarged head is provided at the top of the anchoring steel pipe 3, which is composed of a steel plate 1 and a triangular rib steel plate 2. The enlarged head is arranged inside the gravity retaining wall 4, thereby ensuring the effective connection between the anchoring steel pipe 3 and the gravity retaining wall 4 and enhancing the firmness of the two.

[0034] like Figure 3 As shown, a positioning bracket group and a grouting hole group are provided on the second part, the positioning bracket group includes a plurality of positioning brackets 7, the positioning brackets 7 in the same positioning bracket group are located at the same height, the positioning brackets 7 in the positioning bracket group are located outside the second part and are symmetrically distributed, the grouting hole group includes a plurality of grouting holes 12, the grouting holes 12 in the same grouting hole group are located at the same height, and the grouting holes 12 in the grouting hole group are opened on the second part and are symmetrically distributed;

[0035] In the embodiment of the present application, pressure grouting is performed on the soil surrounding the hole 6 through the grouting holes 12 on the anchoring steel pipe 3, thereby improving the mechanical properties of the soil. The anchoring steel pipe 3 can also provide some vertical bearing capacity. Therefore, the composite foundation formed by the grouting body and the anchoring steel pipe 3 effectively improves the bearing capacity of the entire foundation, providing better geological conditions for the application of the gravity retaining wall 4. The positioning brackets 7 are symmetrically distributed on the outside of the anchoring steel pipe 3, serving to center the anchoring steel pipe 3 and also enhancing the bonding strength between the anchoring steel pipe 3 and the grouting body.

[0036] The gravity retaining wall composite foundation structure includes a concrete cushion layer 10, which is arranged between the gravity retaining wall 4 and the foundation. The first part passes through the concrete cushion layer 10 and is fixedly connected to the gravity retaining wall 4;

[0037] In the embodiment of the present application, a concrete cushion layer 10 is provided between the gravity retaining wall 4 and the foundation, which not only improves the connection strength between the two, but also effectively disperses the load and improves the bearing capacity of the foundation.

[0038] A grouting plug 5 is provided between one end of the second portion close to the concrete cushion layer 10 and the inner wall of the hole 6 of the foundation; the grouting plug 5 is used to prevent the grouting material from leaking out of the hole 6 during the injection process.

[0039] The second part is provided with obliquely arranged support bars 8 at one end away from the concrete cushion layer 10; the support bars 8 can effectively increase the lateral stability of the composite foundation and improve the anti-overturning ability.

[0040] like Figure 4 As shown, the number of triangular rib steel plates 2 is 4, and multiple triangular rib steel plates 2 are arranged on the outside of the first part and are symmetrically distributed. The shape of the steel plate 1 is square.

[0041] The number of positioning brackets 7 in the positioning bracket group is 3, and the number of grouting holes 12 in the grouting hole group is 2.

[0042] The number of multiple positioning bracket groups and multiple grouting hole groups is related to the length of the second part; a group of positioning bracket groups is set every 2 meters for the steel pipe entering the foundation part of the anchoring steel pipe 3, and a grouting hole 12 is opened 2 meters below the foundation surface of the anchoring steel pipe 3. The aperture of the grouting hole 12 is 8 mm, and the spacing between the grouting hole groups is 2 meters.

[0043] The diameter of the anchoring steel pipe 3 is 108 mm, the wall thickness of the anchoring steel pipe 3 is 6 mm, and the material of the anchoring steel pipe 3 is galvanized steel pipe.

[0044] The construction sequence of this application is:

[0045] Step 1: Confirm the location of hole 6 according to the plan and drill it;

[0046] Specifically, such as Figure 5 As shown, the location of hole 6 is related to the masonry position of gravity retaining wall 4. The grouting reinforcement boundary 11 indicates that the area reinforced by anchor steel pipe 3 and the gravity retaining wall 4 occupy the same area. Hole 6 has a diameter of 150 mm. For loose and easily collapsed foundations, retaining wall or pipe drilling should be used. The position deviation of hole 6 cannot exceed 10 cm.

[0047] Step 2: Place the anchoring steel pipe 3 into the hole 6 and set the positioning bracket 7;

[0048] Specifically, the length of the top of the anchoring steel pipe 3 extending beyond the foundation should not be less than 2 meters, and the positioning bracket 7 ensures that the position of the anchoring steel pipe 3 is centered.

[0049] Step 3: sealing the hole 6 with the stop plug 5;

[0050] Specifically, the sealing depth of the grout stopper 5 should be such that no surface cracking or grouting occurs.

[0051] Step 4: Grouting the anchor steel pipe 3 with cement slurry;

[0052] Specifically, the cement used is P.O42.5 grade ordinary Portland cement, and the grouting body is composed of a water-cement ratio of 1:1. The grouting sequence is first external discharge and then internal discharge. In order to prevent the adjacent grouting holes 12 from mixing, inter-hole grouting is adopted.

[0053] Step 5: Stop grouting when the injection rate is no more than 5 L / min for ten minutes at a grouting pressure of 0.5 MPa;

[0054] Step 6: Excavate a foundation trench for the gravity retaining wall 4 and set a concrete cushion layer 10 at the base of the gravity retaining wall 4;

[0055] Step 7: Build the gravity retaining wall 4 and set drainage holes 9 in the wall;

[0056] Specifically, such as Figure 5 As shown, the drainage holes 9 are arranged in staggered rows, with spacing of 2-3 meters between each. During construction, the water inlets of the drainage holes 9 should be temporarily wrapped with plastic film to prevent concrete from entering the holes. A filter layer is installed at the water inlet of the drainage holes 9. During construction of the gravity retaining wall 4, the foundation pit backfill (the area below the lowest row of drainage holes 9) is made of lime soil, while the wall backfill (the area above the lowest row of drainage holes 9) is made of permeable material.

[0057] Step 8: Settlements joints are set in the gravity retaining wall 4.

[0058] Specifically, the gravity retaining wall 4 should be provided with settlement joints according to the terrain and geological changes. The spacing between settlement joints is generally 10-15 meters, and the width of the settlement joints is usually 2 cm. The settlement joints are filled with asphalt hemp along the inner, outer and top sides, with a depth of 15 cm.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A gravity retaining wall composite foundation structure, comprising: An anchoring steel pipe (3), the anchoring steel pipe (3) comprising a first portion and a second portion, the second portion being located below the first portion, and the second portion being disposed in a hole (6) in the foundation; A gravity retaining wall (4), wherein the first part is arranged in the gravity retaining wall (4).

2. The gravity retaining wall composite foundation structure according to claim 1, characterized in that: One end of the first part located inside the gravity retaining wall (4) is sleeved with a steel plate (1), and the steel plate (1) and the first part are fixedly connected via a plurality of triangular rib steel plates (2).

3. The gravity retaining wall composite foundation structure according to claim 1, characterized in that: A positioning bracket group and a grouting hole group are provided on the second part, the positioning bracket group includes a plurality of positioning brackets (7), the positioning brackets (7) in the same positioning bracket group are located at the same height, the positioning brackets (7) in the positioning bracket group are located outside the second part and are symmetrically distributed, the grouting hole group includes a plurality of grouting holes (12), the grouting holes (12) in the same grouting hole group are located at the same height, and the grouting holes (12) in the grouting hole group are opened on the second part and are symmetrically distributed.

4. The gravity retaining wall composite foundation structure according to claim 1, characterized in that The gravity retaining wall composite foundation structure includes a concrete cushion layer (10), the concrete cushion layer (10) is arranged between the gravity retaining wall (4) and the foundation, and the first part passes through the concrete cushion layer (10) and is fixedly connected to the gravity retaining wall (4).

5. The gravity retaining wall composite foundation structure according to claim 4, characterized in that: A grout stopper (5) is provided between one end of the second portion close to the concrete cushion layer (10) and the inner wall of the hole (6) in the foundation.

6. The gravity retaining wall composite foundation structure according to claim 4, characterized in that An end of the second part away from the concrete cushion layer (10) is provided with obliquely arranged support ribs (8).

7. The gravity retaining wall composite foundation structure according to claim 2, characterized in that: The number of the triangular rib steel plates (2) is 4, and a plurality of the triangular rib steel plates (2) are arranged outside the first part and are symmetrically distributed, and the shape of the steel plate (1) is square.

8. The gravity retaining wall composite foundation structure according to claim 3, characterized in that The number of positioning brackets (7) in the positioning bracket group is 3, and the number of grouting holes (12) in the grouting hole group is 2.

9. The gravity retaining wall composite foundation structure according to claim 3, characterized in that: The number of the plurality of positioning bracket groups and the plurality of grouting hole groups is related to the length of the second portion.

10. The gravity retaining wall composite foundation structure according to claim 1, characterized in that The diameter of the anchoring steel pipe (3) is 108 mm, the wall thickness of the anchoring steel pipe (3) is 6 mm, and the material of the anchoring steel pipe (3) is galvanized steel pipe.

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