Expanded head type supporting steel pipe for inclined strut of foundation pit

Abstract

One end of the steel pipe is a movable adjusting end, and the other end of the steel pipe is an expanded head for strengthening supporting. The pipe diameter of the expanding head is larger than that of the steel pipe, and the expanding head is fixed by welding after sleeving the end part of the steel pipe; according to the utility model, one end of the supporting steel pipe adopts the design mechanism of the expansion head, so that the end part of the existing steel pipe can be conveniently transformed, the cost is low, the volume of the end part of the steel pipe is effectively increased, the contact area between the end part of the steel pipe and the earth pier is increased, and the binding force between the end part of the steel pipe and the earth pier is enhanced; steel pipe settlement is prevented.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, and in particular to an enlarged head type support steel pipe for foundation pit diagonal bracing. Background Technology

[0002] In underground structural engineering, in order to meet the construction excavation conditions and control the deformation of the surrounding environment, special foundation pit support construction is required. Some foundation pit support projects adopt plate support systems, that is, retaining walls such as cast-in-place piles, steel piles, and underground continuous walls are set around the foundation pit. Inside the foundation pit, an in-pit support system needs to be set on the top of the retaining wall as a reaction fulcrum to balance the soil pressure on the outside of the retaining wall. The support system generally adopts horizontal or diagonal steel supports or reinforced concrete supports.

[0003] Inclined supports often use supporting steel pipes to achieve inclined support. However, traditional inclined supports all use traditional steel pipes for support. Under long-term support systems, due to the problems of the soil foundation, the steel pipes are prone to settlement, misalignment and deformation.

[0004] In existing technologies, to improve the bonding force between the diagonal brace and the soil pier, a composite load-bearing diagonal bracing method and system is proposed, as proposed in application number 2023105257410. This method involves grouting into the diagonal brace steel pipe to ultimately form a load-bearing body at the bottom of the steel pipe. This structure has a complex process, requiring additional grouting steps. Furthermore, to compress the soil and form the load-bearing body, high-pressure grouting equipment is needed, resulting in high costs and making disassembly difficult later on. Summary of the Invention

[0005] The purpose of this utility model is to propose an enlarged head type support steel pipe for foundation pit diagonal bracing, which enhances the bonding force with the soil mound, thereby reducing the settlement problem caused by long-term support of the support steel pipe.

[0006] To achieve the above objectives, this utility model proposes an enlarged head type support steel pipe for foundation pit diagonal bracing. One end of the steel pipe is an adjustable end, and the other end is an enlarged head for reinforcing support. The diameter of the enlarged head is larger than the diameter of the steel pipe. The enlarged head is fitted onto the end of the steel pipe and then fixed by welding. The end of the enlarged head is a conical head.

[0007] Furthermore, the movable adjustment end is a hinged head; one end of the hinged head is fixed to the steel pipe through a flange, and the other end of the hinged head is connected to the cap beam on the support pile.

[0008] Furthermore, the adjustable end includes a flexible head and at least two jacks;

[0009] The jack includes a fixed base and a connecting plate; the jack is fixed on the fixed base, and the piston rod of the jack touches the surface of the connecting plate; a guide support is provided between the connecting plate and the fixed base.

[0010] Furthermore, the guide support includes a guide tube, and the fixed base has a guide hole on the side facing the connecting plate. One end of the guide tube is fixed to the middle of the connecting plate, and the other end is inserted into the guide hole.

[0011] Compared with the prior art, the advantages of this utility model are:

[0012] 1. The present invention adopts an enlarged head design at one end of the supporting steel pipe, which facilitates the modification of the existing steel pipe end, is low in cost, and effectively increases the volume of the steel pipe end, improves the contact area between the steel pipe end and the soil mound, enhances the bonding force between the steel pipe end and the soil mound, and prevents the steel pipe from settling.

[0013] 2. The supporting steel pipe of this utility model is connected to the cap beam on the support pile by a flexible joint, which makes the installation stage highly flexible and easy to disassemble later.

[0014] 3. The design structure of the movable head of the supporting steel pipe and the upper jack provides reverse support for the connection between the movable head and the capping beam of the support pile. At the same time, when the jack is loaded, the total length of the steel pipe can be extended, and under long-term support, the axial deformation of the steel pipe can be compensated. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the enlarged head type support steel pipe for the foundation pit diagonal bracing in Embodiment 1 of this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the application of the enlarged-head type support steel pipe for the foundation pit diagonal bracing in Embodiment 1 of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the movable head in Embodiment 2 of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described below. Example 1

[0019] like Figure 1 As shown, this utility model proposes an enlarged head type support steel pipe for foundation pit diagonal bracing. One end of the steel pipe 1 is a flexible head 2, and the other end is an enlarged head 5 for reinforcing support.

[0020] To facilitate the improvement of the existing steel pipe 1 by enlarging the head 5, the enlarging head 5 adopts a pipe sleeve with a diameter larger than that of the steel pipe 1. The pipe sleeve is fitted onto the end of the steel pipe 1 and then welded and fixed. Furthermore, to facilitate the pre-embedding of the enlarging head 5, the end of the enlarging head 5 adopts a tapered head design mechanism.

[0021] like Figure 2 The diagram shows a structural schematic of a supporting steel pipe 1 used in foundation pit support. The flexible head 2 of the supporting steel pipe 1 is fixed to the cap beam 4 on the support pile 3, and the enlarged head 5 is pre-embedded in the soil layer. The enlarged head 5 effectively increases the volume of the end of the steel pipe 1, increases the contact area between the end of the steel pipe 1 and the soil mound, enhances the bonding force between the end of the steel pipe 1 and the soil mound, and prevents the steel pipe 1 from settling.

[0022] In this embodiment, the swivel head uses a finished Φ377 swivel end. Example 2

[0023] Example 2 has the same overall structure as Example 1, except that the structure of the movable head 2 is different, such as... Figure 3 As shown, in embodiment 2, the jack 2 is equipped with two additional jacks 21. Specifically, the jack 2 includes a fixed base 23 and a connecting plate 22; the two jacks 21 are fixed on both sides of the fixed base 23, and the piston rods of the jacks 21 touch the surface of the connecting plate 22; the jacks 21 can be fixed to the fixed base 23 and the connecting plate 22 by means of flanges and bolts, or they can be fixed by welding.

[0024] A guide support is provided between the connecting plate 22 and the fixed seat 23. The guide support includes a guide tube. The fixed seat 23 has a guide hole on the side facing the connecting plate 22. One end of the guide tube is fixed to the middle of the connecting plate 22, and the other end is inserted into the guide hole. During the lifting process of the jack 21, the cooperation between the guide rod 24 and the guide hole can prevent the upper and lower positions of the movable head 2 from being misaligned. The jack 21 plays a role in deformation compensation in this scheme, which makes the total length of the steel pipe 1 extend to compensate for the axial deformation of the steel pipe 1 during the support process.

[0025] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A type of enlarged-head support steel pipe for foundation pit diagonal bracing, characterized in that, One end of the steel pipe is a movable adjustment end, and the other end is an enlarged head for reinforcement and support; The diameter of the enlarged head is larger than that of the steel pipe. The enlarged head is fitted onto the end of the steel pipe and then fixed by welding. The end of the enlarged head is tapered.

2. The enlarged-head type support steel pipe for foundation pit diagonal bracing according to claim 1, characterized in that, The movable adjustment end is a hinge; one end of the hinge is fixed to the steel pipe through a flange, and the other end of the hinge is connected to the cap beam on the support pile.

3. The enlarged-head type support steel pipe for foundation pit diagonal bracing according to claim 1, characterized in that, The movable adjustment end includes a flexible head and at least two jacks; The jack includes a fixed base and a connecting plate; the jack is fixed to the fixed base, and the piston rod of the jack touches the surface of the connecting plate; a guide support is provided between the connecting plate and the fixed base.

4. The enlarged-head type support steel pipe for foundation pit diagonal bracing according to claim 3, characterized in that, The guide support includes a guide tube, and the fixed base has a guide hole on the side facing the connecting plate. One end of the guide tube is fixed to the middle of the connecting plate, and the other end is inserted into the guide hole.

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