Limiting and fixing structure for exposed construction of fender post

Abstract

The utility model relates to the field of foundation pit supporting, and discloses a limiting and fixing structure for open construction of fender posts, which is characterized by comprising a steel casing and a profile steel limiting device, the lower end of the steel casing is embedded into the bottom of a first foundation pit, a first support is arranged on the side face of the first foundation pit, and the profile steel limiting device is connected with the upper end of the steel casing. The end of the profile steel limiting device is connected with the upper end of the first support. The steel casing can be prevented from overturning, and later recovery is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of foundation pit support, in particular to a position limiting and fixing structure for retaining piles. Background Art

[0002] In foundation pit construction, due to environmental constraints, it is sometimes necessary to construct two overlapping foundation pits that cannot be excavated simultaneously. First, a first foundation pit needs to be excavated. After the structure in the first foundation pit is completed, it is backfilled and then another second foundation pit is excavated.

[0003] However, when backfilling and then excavating the second foundation pit, drilling piles may cause damage to the structure in the first foundation pit. For example, when the location is very limited, high construction accuracy is required, and the drilling piles are prone to deviation, which may cause damage to the existing structure and reduce the safety of construction.

[0004] Therefore, the inventor invented a method for making retaining piles. Before backfilling the first foundation pit, a steel casing is installed in the first foundation pit. However, since the upper end of the steel casing is in a cantilevered state, it is prone to overturning. A limiting and fixing structure is needed to prevent the steel casing from overturning and facilitate its later recovery. Utility Model Content

[0005] The utility model aims to provide a position limiting and fixing structure for a retaining pile, which can prevent the steel casing from overturning and facilitates its later recovery.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a limiting and fixing structure for retaining piles, comprising a steel casing and a steel limiting device, the lower end of the steel casing is embedded in the bottom of the first foundation pit, a first support is provided on the side of the first foundation pit, the steel limiting device is connected to the upper end of the steel casing, and the end of the steel limiting device is connected to the upper end of the first support.

[0007] The beneficial effects of this program are:

[0008] 1. First, connect the steel section limit device and the first support to complete the positioning of the steel section limit device; then, connect the steel section limit device and the upper end of the steel casing to complete the positioning of the upper end of the steel casing, so that the upper end of the steel casing is no longer in a cantilevered state, thereby preventing the steel casing from overturning.

[0009] 2. Since the two foundation pits overlap, when the second foundation pit is excavated, the part of the first support close to the second foundation pit needs to be removed. At the same time, the end of the steel limit device will be dug out. The steel limit device should be retained first so that the position of the steel casing can be inferred based on the position of the steel limit device, thereby avoiding damage to the steel casing due to misjudgment.

[0010] 3. After the second excavation is complete, the steel stoppers are no longer needed for securing the structure. Therefore, the portion of the steel stoppers that intruded into the first excavation can be cut and recovered, or the entire stoppers can be recovered. Compared to installing diagonal braces in the middle of the steel casing, this solution places the steel stoppers at the top of the casing, closer to the ground and making it easier to recover.

[0011] Furthermore, the steel section limiting device includes two steel sections arranged in parallel on both sides of the steel casing, the middle part of the steel sections is connected to both sides of the upper end of the steel casing, and the steel sections are perpendicular to the side wall of the first foundation pit.

[0012] Furthermore, the first support is a concrete structure, a connecting piece is pre-embedded at the upper end of the first support, and the end of the steel section is connected to the connecting piece.

[0013] Furthermore, the connector is embedded in the upper surface of the first support, the connector and the steel section are parallel and are both I-beams, the steel section is supported on the upper end of the connector and bolted or welded to the connector, and backfill soil is under the steel section.

[0014] Furthermore, the connecting piece is embedded in the side of the first support, the connecting piece is a steel plate, the steel section is a channel steel, the connecting piece is attached to the web position of the end of the steel section, and the connecting piece and the steel section are bolted.

[0015] Furthermore, the distance from the connection position between the steel casing and the steel section to the top of the casing is greater than 50 mm.

[0016] Furthermore, it also includes cast-in-place piles, the upper part of the cast-in-place piles is arranged in a steel casing, and the lower part of the cast-in-place piles is embedded in the bottom of a second foundation pit, and the depth of the second foundation pit is greater than the depth of the first foundation pit.

[0017] Furthermore, an upper retaining wall is cast between the steel casings.

[0018] This solution also has the following effects:

[0019] 1. Steel is usually connected by welding. The welding area of ​​the steel section and the steel casing is small, and the connection is not stable by welding alone. Therefore, the inventors set two steel sections on both sides of the steel casing and limited the steel casing perpendicular to the length direction of the steel section. The welding position only needs to limit the displacement parallel to the length direction of the steel section.

[0020] 2. When the end of the steel section is connected to the top of the first support, the top of the steel casing needs to pass through the top surface of the first support to facilitate welding with the steel section. Therefore, a higher steel casing needs to be constructed, which increases the difficulty of steel casing construction. However, this installation method can make the steel section higher than the ground after backfilling, and it does not need to be buried under the backfill soil, so that the steel section can be removed and recovered after the second foundation pit is excavated later.

[0021] 3. When the end of the steel section is connected to the side of the first support, there is no need to increase the height of the steel casing, which saves steel costs and reduces the construction difficulty of the steel casing.

[0022] 4. The distance from the connection point between the steel casing and the steel section to the top of the casing is greater than 50mm to prevent the steel section from affecting the later pouring of concrete into the steel casing.

[0023] 5. When the depth of the second foundation pit is greater than that of the first foundation pit, it is sufficient to drill holes at the bottom of the casing and cast in-situ piles. This is convenient, fast, free and flexible. The casing can also provide guidance for drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the first foundation pit before backfilling applicable to Example 1;

[0025] Figure 2 This is a schematic diagram of Example 1 after the first foundation pit is backfilled and before the second foundation pit is excavated;

[0026] Figure 3 is a schematic top view of Example 1;

[0027] Figure 4 This is a schematic diagram of the second foundation pit after excavation applicable to Example 1;

[0028] Figure 5 This is a top view schematic diagram of Example 3. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The figure marks in the drawings of the specification include: steel casing 1, cast-in-place piles 2, underground passage 3, connector 4, limit device 5, steel section 6, first foundation pit 7, second foundation pit 8, first support 9, backfill 10, new box culvert 11, upper retaining wall 12.

[0031] Example

[0032] The embodiment is basically as follows Figures 1-4 As shown: A limiting and fixing structure for retaining piles, suitable for Figure 4 The partially overlapping first foundation pit 7 and second foundation pit 8 are shown in the construction. In this embodiment, the first foundation pit 7 is a drainage foundation pit for the second foundation pit 8. A new culvert is designed in the drainage foundation pit. An underground passage 3 is designed in the second foundation pit 8. The depth of the second foundation pit 8 is greater than that of the first foundation pit 7.

[0033] A limiting and fixing structure for retaining piles includes a steel casing 1 and a steel limiting device 5. The lower end of the steel casing 1 is embedded in the bottom of a first foundation pit 7. A first support 9 is provided inside the first foundation pit 7, and a second support is provided inside the second foundation pit 8. The first support 9 and the second support are both retaining walls between piles. Existing construction technology is used. In this embodiment, the steel limiting device 5 is connected to the upper end of the steel casing 1, and the end of the steel limiting device 5 is connected to the upper end of the first support 9.

[0034] Specifically, such as Figure 3 As shown, the steel section limiting device 5 includes two parallel and horizontally arranged steel sections 6 on both sides of the steel casing 1. The middle of the steel sections 6 is welded to the left and right sides of the upper end of the steel casing 1, and the steel sections 6 are perpendicular to the first support 9 on the upper and lower sides of the first foundation pit 7. A connector 4 is pre-embedded in the side surface of the upper end of the first support 9. The connector 4 is an upright steel plate, and the steel section 6 is a channel steel. The height of the connector 4 is less than the height of the web of the steel section 6. The connector 4 is inserted between the upper and lower flanges of the steel section 6 and is attached to the web position of the end of the steel section 6. The connector 4 and the web of the steel section 6 are bolted together.

[0035] It also includes cast-in-situ piles 2, the upper portion of which is set in the steel casing 1, and the lower portion of which is embedded in the bottom of the second foundation pit 8. The depth of the second foundation pit 8 is greater than the depth of the first foundation pit 7. An upper retaining wall 12 is cast between the steel casings 1, and the upper retaining wall 12 is a reinforced concrete structure.

[0036] A construction method for a position-limiting fixed structure for retaining piles is as follows:

[0037] 1. Such as Figure 1 As shown, the first foundation pit 7 is excavated and the first support 9 is constructed. Connectors 4 are pre-buried at the upper ends of the retaining walls 9 between the piles on the left and right sides of the first foundation pit 7. The old box culvert in the first foundation pit 7 is excavated and a new box culvert 11 is constructed. Figure 1 The dotted line in FIG represents the structure designed and built in the second foundation pit 8. In this embodiment, the structure designed and built is an underground passage 3; Figure 4 As shown, the lower end of the steel casing 1 is embedded in the bottom of the first foundation pit 7, the upper end of the steel casing 1 is welded to the section steel 6 of the section steel limiting device 5, and the two ends of the section steel 6 are respectively welded to the connecting pieces 4 on both sides;

[0038] 2. Then cast the upper retaining wall between the steel casings 1 in layers, using the upward construction method, such as Figure 2 As shown, the first foundation pit is backfilled in layers using backfill soil 10;

[0039] 3. Next, drill and cast the cast-in-place pile 2 starting from the bottom of the steel casing 1;

[0040] 4. Such as Figure 4As shown, finally, the second foundation pit 8 is excavated step by step, the first support 9 of the first foundation pit 7 close to the second foundation pit 8 is removed, and the portion of the steel section 6 that intrudes into the second foundation pit 8 is cut. Finally, the underground passage 3 in the second foundation pit 8 is constructed.

[0041] Example 2

[0042] The difference between Example 2 and Example 1 is that the distance from the connection position of the steel casing 1 and the steel section 6 to the top of the casing is 80 mm, and a connecting member 4 is pre-embedded on the upper surface of the upper end of the first support 9. The connecting member 4 and the steel section 6 are parallel and are both I-beams. The steel section 6 is supported on the upper end of the connecting member 4 and is bolted or welded to the connecting member 4. Welding is used in this embodiment. After backfilling the first foundation pit 7, the backfill soil 10 is located below the steel section 6.

[0043] Example 3

[0044] Example 3 is based on Example 1: Figure 5 As shown, the steel section limiting devices are arranged in a well shape, and the steel section limiting devices in the left and right directions and the up and down directions are perpendicular to each other.

[0045] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A position limiting and fixing structure for retaining piles, characterized by: It includes a steel casing and a steel limiting device. The lower end of the steel casing is embedded in the bottom of the first foundation pit. The side of the first foundation pit is provided with a first support. The steel limiting device is connected to the upper end of the steel casing, and the end of the steel limiting device is connected to the upper end of the first support.

2. The position limiting and fixing structure for retaining piles according to claim 1 is characterized in that: The steel section limiting device includes two steel sections arranged in parallel on both sides of the steel casing, the middle part of the steel section is connected to both sides of the upper end of the steel casing respectively, and the steel section is perpendicular to the side wall of the first foundation pit.

3. The position-limiting and fixing structure for retaining piles according to claim 2 is characterized in that: The first support is a concrete structure, with a connecting piece pre-buried at the upper end of the first support, and the end of the steel section is connected to the connecting piece.

4. The position-limiting and fixing structure for retaining piles according to claim 3 is characterized in that: The connecting parts are embedded in the upper surface of the first support. The connecting parts are parallel to the steel sections and are both I-beams. The steel sections are supported on the upper ends of the connecting parts and are bolted or welded to the connecting parts. There is backfill soil under the steel sections.

5. The position limiting and fixing structure for retaining piles according to claim 3 is characterized in that: The connecting piece is embedded in the side of the first support. The connecting piece is a steel plate and the steel section is a channel steel. The connecting piece is attached to the web position of the end of the steel section and the connecting piece and the steel section are connected with bolts.

6. The position limiting and fixing structure for retaining piles according to claim 3, characterized in that: The distance from the connection point between the steel casing and the steel section to the top of the casing is greater than 50mm.

7. The position limiting and fixing structure for retaining piles according to claim 3, characterized in that: It also includes cast-in-place piles, the upper part of which is arranged in a steel casing, and the lower part of which is embedded in the bottom of a second foundation pit, and the depth of the second foundation pit is greater than the depth of the first foundation pit.

8. The position limiting and fixing structure for retaining piles according to claim 3 is characterized in that: An upper retaining wall is cast between the steel casings.

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