Long-term weathered sandstone layer deep foundation pit slope repairing and reinforcing system

Abstract

The utility model provides a long-term weathered sandstone layer deep foundation pit slope repairing and reinforcing system, which belongs to the technical field of building construction and comprises an intercepting ditch arranged at the top of a deep foundation pit slope and a drainage ditch arranged at the bottom of the deep foundation pit slope, a mesh structure and a plurality of rows of full-bonding anchor rods are fixed on the slope surface of the deep foundation pit slope, and the mesh structure covers the intercepting ditch and the drainage ditch. And a concrete surface layer is formed on the mesh structure through integral spraying. According to the deep foundation pit slope supporting system, supporting of a deep foundation pit slope is firmer and more reliable, soil landslide is avoided, structural safety of a deep foundation pit is improved, construction quality is guaranteed, a safer and more convenient environment is provided for a construction working face of the deep foundation pit, and long-term stability and safety of a project are guaranteed. Meanwhile, the intercepting ditch is arranged at the top of the side slope, and the drainage ditch and the water collecting well are arranged at the bottom of the side slope, so that the side slope can form a stable system in rainy seasons or drainage seasons, the durability of the side slope is improved, and the service life of the side slope is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of building construction technology, especially relates to the repair construction of deep foundation pit side slope, and specifically relates to a long-term weathered sandstone layer deep foundation pit side slope repair reinforcing system. BACKGROUND

[0002] Deep foundation pit usually refers to the engineering that the excavation depth exceeds 5 meters or the basement is more than three layers or the depth does not exceed 5 meters but the geological condition and surrounding environment and underground pipeline are particularly complex. When these deep foundation pits are located in sandstone layer, the sandstone layer deep foundation pit is formed.

[0003] The sandstone layer deep foundation pit will have a series of problems after long-term weathering, and these problems have a serious impact on the stability and construction safety of the deep foundation pit. For example, weathering can cause the development and expansion of fissures in the sandstone layer deep foundation pit, and these fissures can become the channel of groundwater seepage, increasing the risk of foundation pit seepage. At the same time, the development of fissures can also make the sandstone layer deep foundation pit more vulnerable to external damage. For another example, weathering can reduce the strength and hardness of the sandstone layer deep foundation pit, making it more likely to break and disintegrate, which can lead to a decrease in the stability of the sandstone layer during the excavation process of the deep foundation pit, increasing the risk of foundation pit collapse. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and provide a long-term weathered sandstone layer deep foundation pit side slope repair reinforcing system.

[0005] The present application is realized by the following technical solutions:

[0006] A long-term weathered sandstone layer deep foundation pit side slope repair reinforcing system, comprising a deep foundation pit side slope, a water interception ditch is arranged at the top of the deep foundation pit side slope, and a drainage ditch is arranged at the bottom of the deep foundation pit side slope; a full-bonding anchor rod extending into the slope body is fixed on the slope surface of the deep foundation pit side slope, the full-bonding anchor rod is uniformly arranged in multiple rows from bottom to top, and is arranged in a plum blossom shape; a mesh structure is laid on the slope surface of the deep foundation pit side slope, the top end part of the mesh structure is turned up to cover the water interception ditch, and the bottom end part of the mesh structure extends to cover the drainage ditch; the outer end of the full-bonding anchor rod is fixedly connected with the mesh structure, a turned-up fixing rib extending into the slope body is vertically fixed at the position adjacent to the water interception ditch at the top of the deep foundation pit side slope, and the outer end of the turned-up fixing rib is fixedly connected with the mesh structure; a concrete surface layer is integrally sprayed on the mesh structure.

[0007] Further, a water collecting well is arranged at the bottom of the deep foundation pit side slope, and the water interception ditch and the drainage ditch are connected with the water collecting well.

[0008] Further, the mesh structure comprises a hot-dip galvanized mesh and a reinforcing rib diamond mesh, the reinforcing rib diamond mesh is laid on the hot-dip galvanized mesh, and the reinforcing rib diamond mesh is fixedly connected with the hot-dip galvanized mesh.

[0009] Further, the outer end of the full-bonding anchor rod is welded and fixed with the hot-dip galvanized mesh, and the two sides of the outer end of the full-bonding anchor rod are welded with the pressing ribs, and the pressing ribs are pressed and fixed on the reinforcing rib diamond mesh.

[0010] Further, the full-bonding anchor rod is made of Φ22mm steel bars, and the horizontal and vertical intervals are both 2m, and the horizontal inclination angle is 15°.

[0011] Further, the turn-up fixing rib is made of Φ22mm steel bars, and the length is 1m, and the exposed length is 0.1m.

[0012] Further, the thickness of the concrete surface layer is 80mm.

[0013] Further, the hot-dip galvanized mesh adopts the hot-dip galvanized mesh with a specification of 2.2*50*50mm, and the reinforcing rib diamond mesh adopts the reinforcing rib diamond mesh with a specification of Φ12mm.

[0014] Further, the pressing rib is made of Φ22mm steel bars, and the length is 50mm.

[0015] The system of the utility model adopts anchor rod+mesh+concrete surface layer to repair and reinforce the weathered sandstone layer deep foundation pit slope, and the supporting force is transmitted to the anchor rod through the concrete surface layer and then directly to the slope protection sandstone layer, so that the support of the deep foundation pit slope is more firm and reliable, the soil landslide is avoided, the structural safety of the deep foundation pit is improved, the construction quality is ensured, a more safe and convenient environment is provided for the construction operation surface of the deep foundation pit, and the long-term stability and safety of the project are ensured. Meanwhile, the system of the utility model is provided with a water intercepting ditch on the slope top and a drainage ditch and a water collecting well on the slope bottom, so that the slope can form a stable system in the rainy season or the drainage season, the durability of the slope is increased, and the service life of the slope is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the sectional schematic view of the system of the utility model as a whole.

[0017] Fig. 2 It is the sectional schematic view of the slope in the utility model.

[0018] Fig. 3 It is the sectional schematic view of the water intercepting ditch / drainage ditch in the utility model.

[0019] Fig. 4 It is the plane schematic view of the mesh structure in the utility model.

[0020] In the drawing: 1-water intercepting ditch, 2-drainage ditch, 3-full-bonding anchor rod, 4-mesh structure, 5-hot-dip galvanized mesh, 6-reinforcing rib diamond mesh, 7-pressing rib, 8-turn-up fixing rib, 9-concrete surface layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "top", "bottom", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "disposition," "connection," etc. should be understood in a broad sense. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] like Figs. 1 to 4 As shown, this embodiment provides a long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system, including a deep foundation pit slope, a cutoff ditch 1 is provided at the top of the deep foundation pit slope, and a drainage ditch 2 and a collection well are provided at the bottom of the deep foundation pit slope, and the cutoff ditch 1 and the drainage ditch 2 are both connected to the collection well.

[0025] Fully bonded anchor rods 3 extending into the slope are fixed on the slope surface of the deep foundation pit. The fully bonded anchor rods 3 are evenly distributed in multiple rows from bottom to top and arranged in a plum blossom shape. The fully bonded anchor rods 3 are made of Φ22mm steel bars, with horizontal and vertical spacing of 2m and a horizontal inclination angle of 15°.

[0026] A mesh structure 4 is laid on the slope of the deep foundation pit. The top part of the mesh structure 4 is flanged to cover the intercepting ditch 1, and the bottom part of the mesh structure 4 extends to cover the drainage ditch 2. The mesh structure 4 includes a hot-dip galvanized mesh 5 and a reinforcing rib diamond mesh 6. The reinforcing rib diamond mesh 6 is laid on the hot-dip galvanized mesh 5, and the reinforcing rib diamond mesh 6 is fixedly connected to the hot-dip galvanized mesh 5. Among them, the hot-dip galvanized mesh 5 adopts a hot-dip galvanized mesh 5 with a specification of 2.2*50*50mm, and the reinforcing rib diamond mesh 6 adopts a reinforcing rib diamond mesh 6 with a specification of Φ12mm.

[0027] The outer end of the full-bonding anchor rod 3 is fixedly connected with the mesh structure 4, specifically, the outer end of the full-bonding anchor rod 3 is welded with the hot-dip galvanized mesh 5, and the two sides of the outer end of the full-bonding anchor rod 3 are welded with the pressing ribs 7, which are pressed and fixed on the reinforced rib diamond mesh 6, the pressing ribs 7 are made of Φ22mm steel bars and have a length of 50mm.

[0028] The turn-up fixing rib 8 extending into the slope body is fixed vertically at the position close to the water intercepting ditch 1 at the top of the deep foundation pit slope, and the outer end of the turn-up fixing rib 8 is fixedly connected with the mesh structure 4; the turn-up fixing rib 8 is made of Φ22mm steel bars and has a length of 1m and an exposed length of 0.1m.

[0029] The mesh structure 4 is integrally sprayed with the concrete surface layer 9, the concrete surface layer 9 is a C20 concrete surface layer, and the spraying thickness of the concrete surface layer 9 is 80mm.

[0030] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system, including a deep foundation pit slope, characterized by: A cut-off ditch is provided at the top of the deep foundation pit slope, and a drainage ditch is provided at the bottom of the deep foundation pit slope; fully bonded anchor rods extending into the slope body are fixed on the slope surface of the deep foundation pit slope, and the fully bonded anchor rods are evenly distributed in multiple rows from bottom to top and arranged in a plum blossom shape; a mesh structure is laid on the slope surface of the deep foundation pit slope, the top part of the mesh structure is flanged to cover the cut-off ditch, and the bottom part of the mesh structure is extended to cover the drainage ditch; the outer end of the fully bonded anchor rod is fixedly connected to the mesh structure, and a flange fixing rib extending into the slope body is vertically fixed at the top of the deep foundation pit slope close to the cut-off ditch, and the outer end of the flange fixing rib is fixedly connected to the mesh structure; a concrete surface layer is formed on the mesh structure by integral spraying.

2. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 1 is characterized by: A water collection well is provided at the bottom of the slope of the deep foundation pit, and the drainage ditch is connected to the water collection well.

3. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 1 or 2 is characterized by: The mesh structure includes a hot-dip galvanized mesh and a reinforced diamond mesh. The reinforced diamond mesh is laid on the hot-dip galvanized mesh, and the reinforced diamond mesh is fixedly connected to the hot-dip galvanized mesh.

4. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 3 is characterized by: The outer end of the fully bonded anchor rod is welded and fixed to the hot-dip galvanized mesh. Compression ribs are welded on both sides of the outer end of the fully bonded anchor rod, and the compression ribs are tightly fixed on the reinforcing rib diamond mesh.

5. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 4 is characterized by: The fully bonded anchor rods are made of Φ22mm steel bars, with horizontal and vertical spacing of 2m and a horizontal inclination of 15°.

6. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 4 is characterized by: The flange fixing reinforcement is made of Φ22mm steel bars, with a length of 1m and 0.1m exposed.

7. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 4 is characterized by: The thickness of the concrete surface layer is 80mm.

8. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 4 is characterized by: The hot-dip galvanized mesh adopts the specification of 2.2*50*50mm, and the reinforced diamond mesh adopts the reinforced diamond mesh with the specification of Φ12mm.

9. The long-term weathered sandstone layer deep foundation pit slope repair and reinforcement system according to claim 4 is characterized by: The compression reinforcement is made of Φ22mm steel bars with a length of 50mm.

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