Steel support anti-falling structure suitable for rock foundation pit

Abstract

The steel support anti-falling structure suitable for the rock foundation pit comprises an anchor hole, an anchor rod, an upper support and a lower support, the anchor hole is formed in a rock stratum, one end of the anchor rod is fixedly inserted into the anchor hole, the other end of the anchor rod protrudes out of the side wall of the rock stratum, and external threads are arranged at the end, protruding out of the side wall of the rock stratum, of the anchor rod. The upper support and the lower supporting frame are fixedly arranged on the side wall of a rock stratum through anchor rods, the upper support is arranged on the upper side of the steel support, the lower supporting frame is arranged on the lower side of the steel support, the upper side face of the lower supporting frame abuts against the lower side face of the steel support, and the upper support is connected with the suspended end of the steel support through a steel wire rope or round steel. Two upper supports are arranged in the vertical direction, the steel wire rope or the round steel on the upper upper support is connected with the outer end of the steel support, and the lower upper support is connected with the inner end of the steel support. The structure can effectively improve the construction efficiency, reduce the construction cost, save the project investment and avoid the situation that the steel support cannot directly act on the rock stratum.

Description

Technical Field

[0001] This utility model relates to the field of engineering construction technology, specifically to a steel support anti-fall structure suitable for rock foundation pits. Background Technology

[0002] When subway stations are constructed using the open-cut method, steel supports are often used to balance lateral soil and rock pressure. However, steel supports risk falling off if the lateral axial force does not reach the design value; in mountainous cities, where the rock strata are often relatively intact, securing the steel supports becomes a challenge.

[0003] Therefore, a steel support structure that can prevent falls is needed to balance the pressure on the soil and rock. Utility Model Content

[0004] In view of this, the problem to be solved by this utility model is to provide a steel support anti-fall structure suitable for rock foundation pits. This structure can effectively improve construction efficiency, reduce construction costs, save project investment, and avoid the steel support not being able to directly act on the rock strata.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: This utility model provides a steel support anti-fall structure suitable for rock foundation pits, including anchor holes, anchor rods, upper supports, and lower support frames. The anchor holes are set in the rock stratum. One end of the anchor rod is inserted and fixed in the anchor hole, and the other end protrudes from the side wall of the rock stratum. The anchor rods correspond one-to-one with the anchor holes. The end of the anchor rod protruding from the side wall of the rock stratum is provided with external threads. The upper supports and lower support frames are respectively fixed to the side wall of the rock stratum by anchor rods. The upper supports are set on the upper side of the steel support, and the lower support frames are set on the lower side of the steel support. The upper side of the lower support frame abuts against the lower side of the steel support. The upper supports are connected to the suspended end of the steel support by steel wire ropes or round steel. Two upper supports are set in the vertical direction. The steel wire rope or round steel on the upper upper support is connected to the outer end of the steel support, and the lower upper support is connected to the inner end of the steel support.

[0006] Furthermore, the anchor hole is inclined downward within the rock stratum, and the inclination angle of the anchor hole is 10 to 20 degrees.

[0007] Furthermore, the anchor rod is configured as an anchor rod, and the mortar filling the anchor hole is M30 cement mortar.

[0008] Furthermore, the upper support is L-shaped, and the first side of the upper support is provided with mounting holes corresponding to the anchor rod. The two ends of the wire rope or round steel are respectively provided with hooks, the first bottom edge of the upper support is provided with hanging holes corresponding to the hooks, and the steel support is provided with hanging ears corresponding to the hooks. The hanging ears correspond to the hanging holes on the upper support.

[0009] Furthermore, the lower support frame is configured as an L-shape, with the second bottom edge of the L-shaped lower support frame abutting against the lower side of the steel support. A second mounting hole corresponding to the anchor hole is provided on the second side of the lower support frame. After the anchor rod passes through the second mounting hole, the lower support frame is fixed to the side wall of the rock stratum by bolts.

[0010] Furthermore, a reinforcing rod is provided between the side and bottom edge of the lower support frame.

[0011] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows: This utility model provides a steel support anti-fall structure suitable for rock foundation pits, including anchor holes, anchor rods, upper supports, and lower support frames. The anchor holes are set in the rock stratum. One end of the anchor rod is inserted and fixed in the anchor hole, and the other end protrudes from the side wall of the rock stratum. The anchor rods correspond one-to-one with the anchor holes. The end of the anchor rod protruding from the side wall of the rock stratum is provided with external threads. The upper supports and lower support frames are respectively fixed to the side wall of the rock stratum by anchor rods. The upper supports are set on the upper side of the steel support, and the lower support frames are set on the lower side of the steel support. The upper side of the lower support frame abuts against the lower side of the steel support. The upper supports are connected to the suspended end of the steel support by steel wire ropes or round steel. Two upper supports are set in the vertical direction. The steel wire rope or round steel on the upper upper support is connected to the outer end of the steel support, and the lower upper support is connected to the inner end of the steel support. This structure can effectively improve construction efficiency, reduce construction costs, save project investment, and prevent steel supports from being unable to directly act on the rock strata. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0013] Figure 1 A schematic diagram of a steel support anti-fall structure suitable for rock foundation pits provided by this utility model;

[0014] Figure label:

[0015] 1-Anchor hole; 2-Anchor rod; 3-Upper bracket; 4-Lower support frame; 5-Rock stratum; 6-Steel support; 31-Steel wire rope; 41-Reinforcing rod; 32-First side; 33-First bottom; 42-Second side; 43-Second bottom; 61-Hanging lug. Detailed Implementation

[0016] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] Please see Figure 1 This utility model provides a steel support anti-fall structure suitable for rock foundation pits, including anchor holes, anchor rods 2, upper supports 3, and lower support frames 4. The anchor holes are located within the rock stratum 5. One end of each anchor rod 2 is inserted and fixed into the anchor hole, while the other end protrudes from the side wall of the rock stratum 5 for easy installation of the upper supports 3 and / or the lower support frames 4. Each anchor rod 2 corresponds one-to-one with an anchor hole. The number of anchor holes and anchor rods 2 is determined according to requirements. The end of each anchor rod 2 protruding from the side wall of the rock stratum 5 is provided with external threads. The upper supports 3 and lower support frames 4 are... The upper support 3 is fixed to the side wall of the rock stratum 5 by anchor bolt 2. The upper support 3 is set on the upper side of the steel support 6, and the lower support 4 is set on the lower side of the steel support 6. The upper side of the lower support 4 abuts against the lower side of the steel support 6. The upper support 3 is connected to the suspended end of the steel support 6 by wire rope 31 or round steel. There are two upper supports 3 in the vertical direction. The wire rope 31 or round steel on the upper support 3 is connected to the outer end of the steel support 6, and the lower support 3 is connected to the inner end of the steel support 6. Anchor holes are set in the rock stratum 5, and anchor rods 2 are fixed in the anchor holes with mortar. Then, the upper support 3 and the lower support frame 4 are fixed to the anchor rods 2 to make them fulcrums. The upper support 3 is set in two layers and connected to the suspended end of the steel support 6 by steel wire ropes 31 or round steel to support the far end of the steel support 6. The lower support frame 4 supports the end of the steel support 6 near the rock wall, so that the entire steel support 6 can form a support and prevent the steel support 6 from falling when the lateral axial force does not reach the design value.

[0018] This structure effectively improves construction efficiency, reduces construction costs, saves project investment, and prevents the steel support 6 from being unable to directly support the rock strata 5. It has significant potential for widespread application in engineering projects such as subways constructed in mountainous urban areas and other geological conditions.

[0019] As a further improvement to the above technical solution, the anchor hole is inclined downwards within the rock stratum 5, with an inclination angle of 10-20 degrees. The anchor rod 2 is set as anchor rod 2, and the filling mortar of the anchor hole is M30 cement mortar. The construction process includes positioning, hole drilling, reinforcement placement, and grouting. Hole drilling: A spiral drill is used for hole drilling; Reinforcement placement: First, remove debris and mud from the hole, then insert reinforcement bars, and set a positioning bracket every 1.5 meters on the reinforcement bars; Grouting: During grouting, a grout stop plug should be set at the hole opening and tightly fitted to the hole wall. Grouting should start from the bottom of the hole, and water-reducing agent, early-strength agent, and expansion agent can be added appropriately to the grout. M30 cement mortar is used, and ordinary Portland cement is preferred. The grouting pressure is 0.5 MPa. In use, after the anchor rod 2 is anchored to the rock stratum 5, the angle steel bracket and wire rope 31 are connected to the pre-positioned anchor rod 2 using nuts to directly fix the bracket to the rock stratum 5. This fall protection scheme effectively anchors the support to the rock stratum 5. It also avoids the need to first construct a concrete cap beam and drilled piles as the lateral load-bearing carrier for the steel support 6.

[0020] As a further improvement to the above technical solution, the upper support 3 is L-shaped. The first side 32 of the upper support 3 has mounting holes corresponding to the anchor rod 2. Hooks are provided at both ends of the wire rope 31 or round steel. Hanging holes corresponding to the hooks are provided on the first bottom edge 33 of the upper support 3. Hanging ears 61 corresponding to the hooks are provided on the steel support 6, and these hanging ears 61 correspond to the hanging holes on the upper support 3. The upper support 3 is an L100×100×10 angle steel. Mounting holes are provided on one of the first side 32, allowing it to be installed and fixed to the side wall of the rock stratum 5. Hanging holes are provided on the first bottom edge 33 to facilitate connecting the wire rope 31 or round steel to the upper support 3. Tightening components are provided on the round steel or wire rope 31 to adjust its length and thus its tightness after the steel support 6 is attached. Preferably, a reinforcing plate is also provided between the first and second side 42 and the first and second bottom edge 43 of the upper support 3.

[0021] As a further improvement to the above technical solution, the lower support frame 4 is configured as an L-shape, with the second bottom edge 43 of the L-shaped lower support frame 4 abutting against the lower side of the steel support 6. The second side edge 42 of the lower support frame 4 is provided with a second mounting hole corresponding to the anchor hole. After the anchor rod 2 passes through the second mounting hole, the lower support frame 4 is fixed to the side wall of the rock stratum 5 by bolts. A reinforcing rod 41 is also provided between the second side edge 42 and the second bottom edge 43 of the lower support frame 4. The second side 42 and the second bottom side 43 of the lower support frame 4 are both made of L100×80×8 angle steel with a length of 700 mm. The second side 42 and the second bottom side 43 are fixed into a right-angle shape by welding. A second mounting hole matching the anchor hole on the lower side is opened on one side of the angle steel of the second side 42 for mounting and fixing the lower support frame 4. A reinforcing rod 41 is welded between the second side 42 and the second bottom side 43 to strengthen the second bottom side 43 and prevent deformation of the second side 42 under pressure, forming an isosceles right-angled triangle shape. The reinforcing rod 41 is made of L80×80×8 angle steel. A base plate is provided at the suspended end of the second bottom side 43.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A steel-supported anti-fall structure suitable for rock foundation pits, characterized in that: The system includes anchor holes (1), anchor rods (2), an upper support (3), and a lower support frame (4). The anchor holes (1) are set inside the rock stratum (5). One end of the anchor rod (2) is inserted and fixed inside the anchor hole (1), and the other end protrudes from the side wall of the rock stratum (5). The anchor rods (2) correspond one-to-one with the anchor holes (1). The end of the anchor rod (2) protruding from the side wall of the rock stratum (5) is provided with external threads. The upper support (3) and the lower support frame (4) are respectively fixed to the side wall of the rock stratum (5) by the anchor rods (2). The upper support (3) The upper support (6) is set on the upper side of the steel support (6), and the lower support frame (4) is set on the lower side of the steel support (6), with the upper side of the lower support frame (4) abutting against the lower side of the steel support (6). The upper support (3) is connected to the suspended end of the steel support (6) by a wire rope (31) or a round steel. There are two upper supports (3) in the vertical direction. The wire rope (31) or round steel on the upper support (3) is connected to the outer end of the steel support (6), and the lower support (3) is connected to the inner end of the steel support (6).

2. The steel-supported anti-fall structure for rock foundation pits according to claim 1, characterized in that: The anchor hole (1) is set downwards in the rock layer (5), and the angle of inclination of the anchor hole (1) is 10~20 degrees.

3. The steel-supported anti-fall structure suitable for rock foundation pits according to claim 2, characterized in that: The anchor rod (2) is set as anchor rod (2), and the filling mortar of the anchor hole (1) is M30 cement mortar.

4. The steel-supported anti-fall structure suitable for rock foundation pits according to claim 1, characterized in that: The upper support (3) is L-shaped. The first side (32) of the upper support (3) is provided with mounting holes corresponding to the anchor rod (2). The two ends of the wire rope (31) or round steel are respectively provided with hooks. The first bottom edge (33) of the upper support (3) is provided with hanging holes corresponding to the hooks. The steel support (6) is provided with hanging ears (61) corresponding to the hooks. The hanging ears (61) correspond to the hanging holes on the upper support (3).

5. The steel-supported anti-fall structure suitable for rock foundation pits according to claim 1, characterized in that: The lower support frame (4) is L-shaped. The second bottom edge (43) of the L-shaped lower support frame (4) abuts against the lower side of the steel support (6). The second side edge (42) of the lower support frame (4) is provided with a second mounting hole corresponding to the anchor hole (1). After the anchor rod (2) passes through the second mounting hole, the lower support frame (4) is fixed to the side wall of the rock layer (5) by bolts.

6. The steel-supported anti-fall structure for rock foundation pits according to claim 5, characterized in that: A reinforcing rod (41) is also provided between the side and bottom of the lower support frame (4).

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