Front supporting type grouting inclined strut

Abstract

The utility model relates to a front supporting type grouting inclined strut which comprises double-spliced H-shaped steel, the double-spliced H-shaped steel is spliced to form an inclined strut, one end of the inclined strut is obliquely inserted into a soil body, the other end of the inclined strut extends to the position above a foundation pit fender pile, a ring beam is poured above the fender pile, and one end of the inclined strut is poured in the ring beam. The H-shaped steel and the steel plates are spliced to form the double-spliced H-shaped steel, the double-spliced H-shaped steel is arranged around the foundation pit as required to form the inclined struts, and the inclined struts are relatively independent, are not influenced by the shape and the size of the foundation pit, and are suitable for supporting arrangement of special-shaped and large foundation pits; h-shaped steel, cement and other common materials are adopted, the price is low, local materials can be used, the purpose of saving materials is achieved, and the foundation pit manufacturing cost is reduced; the foundation pit inclined support is suitable for foundation pit inclined supports of soft soil and common non-hard soil layers, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the field of foundation pit enclosure, in particular to a front-support type grouting diagonal support. Background Art

[0002] With the development of urban construction, foundation pits are increasingly restricted by surrounding conditions during construction. In addition, due to the irregular shape of the foundation pit, the conventional horizontal support layout is limited and the force is unreasonable; or the foundation pit area is too large, the length-to-width ratio is close, the horizontal support amount is huge, and the support material is seriously wasted.

[0003] Therefore, it is urgent to develop a front-support grouting diagonal brace that can meet the current support arrangement requirements of irregular foundation pit shapes, save support materials for large foundation pits, and reduce construction costs. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a front-support type grouting diagonal brace.

[0005] This front-support grouting diagonal brace includes a double H-shaped steel, which is spliced ​​together to form a diagonal brace. One end of the diagonal brace is obliquely inserted into the soil, and the other end extends above the foundation pit retaining pile. A ring beam is cast above the retaining pile, and one end of the diagonal brace is cast inside the ring beam.

[0006] A closed space is formed inside the double-jointed H-shaped steel, in which a grouting pipe is arranged, and an enlarged head is cast at one end of the diagonal brace inserted into the soil.

[0007] Preferably, the double H-shaped steel includes H-shaped steel and steel plates. The two H-shaped steels are arranged side by side, and the upper wing plates and the lower wing plates are spliced ​​with each other. The connection points of the upper wing plates and the lower wing plates of the two H-shaped steels are fixed by steel plates respectively.

[0008] Preferably, a closed space is formed between the webs of the two H-shaped steels, and two grouting pipes are symmetrically arranged on opposite surfaces of the upper wing plate and the lower wing plate.

[0009] Preferably, the steel plate is arranged on the outside of the double H-shaped steel, and the width of the steel plate is 1 to 2 times the width of the H-shaped steel flange.

[0010] Preferably, several diagonal braces are provided at intervals around the foundation pit.

[0011] The beneficial effects of the utility model are:

[0012] 1) The utility model forms a double H-shaped steel by splicing H-shaped steel and steel plate. The double H-shaped steel is arranged around the foundation pit as needed to form diagonal braces. The diagonal braces are relatively independent and are not affected by the shape and size of the foundation pit. It is suitable for the support arrangement of special-shaped and large foundation pits.

[0013] 2) The front support grouting oblique support process of the utility model adopts H-shaped steel as the material, cement and other common materials, which are cheap and can be obtained locally, thus achieving the purpose of saving materials and reducing the cost of foundation pit; and the utility model is suitable for oblique support of foundation pits in soft soil and general non-hard soil layers, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front-supported grouting diagonal brace;

[0015] Figure 2 Schematic diagram of the H-shaped steel structure.

[0016] Explanation of the accompanying reference numerals: ring beam 1, H-shaped steel 2, steel plate 3, grouting pipe 4, retaining pile 5. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the following embodiments. The following embodiments are provided solely to facilitate understanding of the present invention. It should be noted that, within the scope of the present invention, modifications may be made by a person skilled in the art without departing from the principles of the present invention. Such improvements and modifications are also within the scope of the claims of the present invention.

[0018] As an example, Figure 1 and Figure 2 As shown, this front-supported grouting diagonal brace includes double H-shaped steels, which are spliced ​​together to form a diagonal brace. According to the shape and size of the foundation pit, several diagonal braces are arranged at intervals around the foundation pit. All the diagonal braces are relatively independent of each other and are therefore not restricted by the shape of the foundation pit.

[0019] like Figure 2 As shown, the double-jointed H-beam consists of H-beam 2 and steel plate 3. The two H-beams 2 are arranged side by side, and the upper and lower wing plates are spliced ​​together. The connection between the upper and lower wing plates of the two H-beams 2 is welded and fixed by steel plate 3. The steel plate 3 is welded to the outside of the double-jointed H-beam. The width of the steel plate 3 is 1 to 2 times the width of the H-beam 2 wing plate to ensure the connection strength between the H-beams 2.

[0020] A closed space is formed between the webs of the two H-shaped steels 2. Grouting pipes 4 are provided in the closed space. The two grouting pipes 4 are symmetrically welded to the opposite surfaces of the upper wing plate and the lower wing plate.

[0021] like Figure 1 As shown, one end of the diagonal brace is obliquely inserted into the soil, and an enlarged head is cast on the end of the diagonal brace inserted into the soil. The other end of the diagonal brace extends above the retaining pile 5 of the foundation pit, and a ring beam 1 is cast above the retaining pile 5. One end of the diagonal brace is connected to the ring beam 1 by cast-in-place.

[0022] In this embodiment, the double H-shaped steel specifications are HM500×300×11×18, the steel plate 3 specifications are 400×300×18, and the grouting pipe 4 specifications are The size of ring beam 1 is 1200mm×800, the water-cement ratio of grouting slurry is 0.55, and the grouting volume of a single diagonal brace is not less than 5t.

[0023] The specific steps for the construction of this front-supported grouting diagonal brace are as follows:

[0024] After surveying and setting out, excavating trenches, and completing the construction of retaining piles 5, the floating slurry on the top of the retaining piles 5 and the pile heads should be cleaned, the trenches for the ring beam 1 should be excavated and cleaned, and underground obstacles should be removed in a timely manner to ensure normal construction.

[0025] After H-beam 2 and steel plate 3 are joined to form a double H-beam, the double H-beam is then joined to form a diagonal brace. This brace is then pressed diagonally into the soil to the designated depth using a manipulator. Specifically, the manipulator lifts one end, while the excavator hoists the other end, assisting the manipulator in adjusting the brace to the hole position. The manipulator then activates vibration and presses the brace down to the designated pile bottom position. The upper end is bonded to ring beam 1 and cast in place, providing support and reaction force.

[0026] When mixing grouting slurry, the raw materials for mixing slurry must be strictly measured before being put into the mixer. The difference in the amount of various raw materials should not exceed 2%.

[0027] The lower end is grouted through the grouting pipe 4 to form an enlarged head. The pile end bearing capacity is achieved by skipping and filling in the order of one grouting and stopping when the grouting reaches 5t or the pressure reaches 2Mpa.

Claims

1. A front-supported grouting brace, characterized in that: It includes double H-shaped steel, which is spliced ​​together to form a diagonal brace. One end of the diagonal brace is obliquely inserted into the soil, and the other end extends above the foundation pit retaining pile. A ring beam is cast above the retaining pile, and one end of the diagonal brace is cast inside the ring beam. The double H-shaped steel includes H-shaped steel and steel plates. The two H-shaped steels are arranged side by side, and the upper and lower wing plates are spliced ​​with each other. The connection between the upper and lower wing plates of the two H-shaped steels is fixed by steel plates respectively. A closed space is formed inside the double H-shaped steel. The closed space is a through structure with a grouting pipe inside. An enlarged head is cast at one end of the diagonal brace inserted into the soil. A closed space is formed between the webs of the two H-shaped steels, and two grouting pipes are symmetrically arranged on the opposite surfaces of the upper wing plate and the lower wing plate.

2. The front-supported grouting brace according to claim 1 is characterized in that: The steel plate is arranged on the outside of the double H-shaped steel, and the width of the steel plate is 1 to 2 times the width of the H-shaped steel flange.

3. The front-supported grouting brace according to claim 1 is characterized in that: Several diagonal braces are installed at intervals around the foundation pit.

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