Foundation pit protective fence for municipal engineering construction

Abstract

The foundation pit protective fence for municipal engineering construction comprises a base, side columns, an upper cross beam, a lower cross beam, vertical handrails, lower check blocks and upper baffles, the side columns are detachably installed on the base, installation grooves are formed in the side columns, the upper cross beam and the lower cross beam are detachably installed in the installation grooves, transverse insertion holes are formed in the upper ends and the lower ends of the vertical handrails, and the lower check blocks are inserted into the transverse insertion holes. Locking knobs are arranged at the tops and the bottoms of the vertical handrails, connecting bases are arranged on the side columns, tooth-shaped convex columns are arranged on the connecting bases, connecting pieces are installed on the tooth-shaped convex columns, clamping groove sleeves are arranged on the connecting pieces, the clamping groove sleeves and the tooth-shaped convex columns are installed and matched in a relative limiting mode, and turncaps for locking the clamping groove sleeves are installed on the tooth-shaped convex columns in a threaded mode; a rear inclined supporting piece is detachably arranged on the rear portion of the side column, a fixing nail is arranged on the rear inclined supporting piece, the lower check block is detachably arranged between the bases, and the upper baffle is detachably arranged on the upper cross beam. And the assembled and disassembled functions are achieved, carrying, storage and transportation are convenient, the angle is adjusted, and the ground stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal engineering, in particular to a foundation pit guardrail used for municipal engineering construction. Background Art

[0002] In municipal engineering construction, foundation pit construction is often necessary. The foundation pit is an earth pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. Before excavation, the excavation plan should be determined based on geological and hydrological data and the conditions of nearby buildings on site, and waterproofing and drainage work should be done. If the excavation is not deep, the side slope can be used to stabilize the earth slope, and the slope size is determined according to relevant construction regulations.

[0003] In municipal engineering construction, foundation pit construction requires the use of foundation pit guardrails to enclose the excavation area of ​​the municipal engineering construction site, mainly to serve as a warning, prevent people or vehicles from falling in, and protect the construction equipment. At present, the foundation pit guardrails used in general municipal engineering construction are hard guardrails with fixed structures. Such foundation pit guardrails are often large in size and do not have assembly and disassembly functions, which are very troublesome to transport or carry. Secondly, the foundation pit guardrails currently used in municipal engineering construction cannot be adjusted at relative angles during use, so it is difficult to enclose the corners of the foundation pit, and the protective effect of the enclosure is poor, and it cannot fit the outer shape of the foundation pit. In addition, the existing foundation pit guardrails for municipal engineering construction are prone to tipping over when encountering strong winds and other weather outdoors, or when encountering external collisions, causing the guardrails to lose their protective effect, so it is necessary to improve them. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a foundation pit guardrail for municipal engineering construction, which has the characteristics of assembly and disassembly function, convenient handling, storage and transportation, angle adjustment and good ground stability.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a foundation pit guardrail for municipal engineering construction, comprising a base, a side column, an upper crossbeam, a lower crossbeam, a vertical railing, a lower stopper and an upper baffle, wherein the side column can be detachably mounted on the base, a mounting groove is provided on the side column, the upper crossbeam and the lower crossbeam can be detachably mounted in the mounting groove, the upper and lower ends of the vertical railing are provided with transverse plug holes, the upper crossbeam and the lower crossbeam are respectively plugged and matched with the transverse plug holes, the top and bottom of the vertical railing are provided with locking knobs, the side column is provided with a connecting seat, the engagement seat A toothed boss is provided on the receiving seat, a connecting piece is installed on the toothed boss, a slot sleeve is provided on the connecting piece, the slot sleeve and the toothed boss are relatively limited and installed to cooperate, a screw cap for locking the slot sleeve is threadedly installed on the toothed boss, the slot sleeve is provided with a plurality of slots, the toothed boss is provided with a tooth portion, the slots are limited and installed to cooperate with the tooth portion, a rear oblique support piece is detachably provided on the rear part of the side column, a fixing nail is provided on the rear oblique support piece, the lower stop block is detachably provided between the base, and the upper baffle is detachably provided on the upper cross beam.

[0006] As a preferred embodiment of the utility model, the base is provided with square sockets, bolt holes and reinforcing ribs, the bolt holes are located at the four corners of the base, the side columns are inserted into the square sockets, and the outside of the base is provided with bolts I fixed relative to the side columns.

[0007] As a preferred embodiment of the utility model, a plug-in tube is provided on the side of the base, a horizontal column is inserted in the plug-in tube, the lower stopper is provided between the horizontal columns, and a step surface is provided obliquely on the front portion of the lower stopper.

[0008] As a preferred embodiment of the present invention, the front sides of the side posts and the vertical railings are covered with reflective tapes.

[0009] As a preferred embodiment of the utility model, a through hole is provided on the upper cross beam, a lower insert screw is provided at the bottom of the upper baffle, a limiting position protrusion is provided on the lower insert screw, the lower insert screw is inserted in the through hole, and a butterfly bolt locked with the upper cross beam is threadedly installed on the end of the lower insert screw.

[0010] As a preferred embodiment of the utility model, a sharp tooth portion is provided on the top of the upper baffle plate, and a warning slogan is provided on the surface of the upper baffle plate.

[0011] As a preferred embodiment of the present invention, the mounting groove is provided with an arc-shaped portion, and the upper crossbeam and the lower crossbeam are provided with arc convex portions that match the arc-shaped portion.

[0012] As a preferred embodiment of the utility model, a threaded boss is arranged on the toothed boss, and a threaded hole corresponding to the threaded boss is arranged on the screw cap.

[0013] As a preferred embodiment of the present invention, a rotary handle is provided on the rotary cap.

[0014] As a preferred embodiment of the utility model, the rear oblique support member includes an upper plate, an oblique plate and a ground docking plate which are integrally arranged, a socket I and a socket II are arranged at the rear of the side column, the upper plate is inserted into the socket I, and a bolt II for locking the upper plate is arranged on the side of the socket I, the fixing nail 1 is installed on the ground docking plate, the socket II is provided with a limiting plug-in block, a through hole is arranged in the installation groove, the limiting plug-in block is inserted into the through hole and limits the lower cross beam, and a bolt III for locking the limiting plug-in block is arranged on the side of the socket II.

[0015] By adopting the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The utility model discloses a simple and reasonable structure, the side column is detachably mounted on the base, the upper cross beam and the lower cross beam are detachably mounted in the mounting groove, the vertical railing is respectively plugged and matched with the upper cross beam and the lower cross beam through the horizontal insertion hole, and is locked or disassembled by operating the locking knob, and the rear of the side column is detachably provided with a rear oblique support piece, the lower stopper is detachably arranged between the base, and the upper baffle is detachably arranged on the upper cross beam, and the installation or disassembly between the unit guardrails can be separated and disassembled by operating the rotating cap and taking out the card slot sleeve and the connecting piece. The whole structure makes the base, side column, upper cross beam, lower cross beam, vertical railing, lower stopper, upper baffle and rear oblique support piece present a detachable structure, and has the function of flexible assembly and disassembly during transportation, and each component can be transported in a regular manner compared with the foundation pit guardrail with a larger volume, so that it is convenient to transport, and it is also convenient to store and compactly place on a transport vehicle during transportation, and the transportation volume of a single vehicle is greatly increased, which is convenient for transportation; the connecting piece is equipped with a card slot sleeve, which is installed and matched with the toothed convex column When the foundation pit guardrail is installed at the corner of the foundation pit, it is only necessary to adjust the angle between the side columns. By removing the screw cap and pulling out the connecting piece, the slot sleeve is disengaged, and then the angle between the side columns is arranged. It is only necessary to adjust the angle of the connecting piece according to the angle between the side columns. After adjustment, the slot sleeves of the connecting piece are respectively installed on the toothed protrusions. Since the toothed protrusions are fixed, once the teeth and the slots are limited and engaged, the angle will be locked. The screw cap plays a longitudinal limiting role. The number of teeth and slots is set according to the required situation of the angle adjustment of the foundation pit guardrail. A single tooth and slot are used as the angle adjustment unit. This structure can well fit the outer shape of the foundation pit to adjust the relative angle of the foundation pit guardrail; through the rear oblique support, the fixing nails can increase the stability of the ground, achieve the oblique support effect, ensure the strength of the side columns, and then ensure the strength of the foundation pit guardrail. Even when encountering strong winds or external collisions outdoors, it is not easy to tip over, thereby ensuring the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the base of the utility model;

[0020] Figure 3 It is a schematic diagram of the separation of the rear oblique support member, the limit plug-in block and the side column of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the upper crossbeam of the utility model;

[0022] Figure 5 It is a schematic diagram of the split structure of the vertical railing and the locking knob of the utility model;

[0023] Figure 6 It is a schematic diagram of the split structure of the upper baffle and the butterfly bolt of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the connecting piece of the utility model;

[0025] Figure 8 It is a structural schematic diagram of the screw cap of the utility model;

[0026] In the figure: 1, base; 2, side column; 3, upper crossbeam; 4, lower crossbeam; 5, vertical railing; 6, lower block; 7, upper baffle; 8, mounting groove; 81, arc portion; 82, arc convex portion; 9, horizontal plug hole; 10, locking knob; 11, connecting seat; 12, toothed convex column; 13, connecting piece; 14, slot sleeve; 15, screw cap; 16, slot; 17, tooth portion; 18, rear oblique support; 19, fixing nail; 20, square plug hole; 21, bolt hole; 22, reinforcing rib; 23, Bolt I; 24, plug-in tube; 25, cross column; 26, step surface; 27, reflective tape; 28, through hole; 29, lower plug-in screw; 30, limit convex ring; 31, butterfly bolt; 32, sharp tooth portion; 33, warning slogan; 34, threaded boss; 35, threaded hole; 36, rotary handle; 37, upper plate; 38, inclined plate; 39, ground docking plate; 40, socket I; 41, socket II; 42, bolt II; 43, limit plug-in block; 44, through hole; 45, bolt III. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0028] See also Figure 1-8 The utility model provides a technical solution: a foundation pit guardrail for municipal engineering construction, comprising a base 1, a side column 2, an upper crossbeam 3, a lower crossbeam 4, a vertical railing 5, a lower stopper 6 and an upper baffle 7, the side column 2 can be detachably mounted on the base 1, a mounting groove 8 is provided on the side column 2, the upper crossbeam 3 and the lower crossbeam 4 can be detachably mounted in the mounting groove 8, the upper and lower ends of the vertical railing 5 are provided with horizontal insertion holes 9, the upper crossbeam 3 and the lower crossbeam 4 are respectively plugged with the horizontal insertion holes 9, the top and bottom of the vertical railing 5 are provided with locking knobs 10, the side column 2 is provided with a connecting seat 11, and the connecting seat 11 is provided with a toothed The boss 12 is provided with a connecting piece 13, the connecting piece 13 is provided with a slot sleeve 14, the slot sleeve 14 and the toothed boss 12 are relatively limitedly installed and matched, the toothed boss 12 is threadedly installed with a screw cap 15 for locking the slot sleeve 14, the slot sleeve 14 is provided with a plurality of slots 16, the toothed boss 12 is provided with a tooth portion 17, the slots 16 and the tooth portion 17 are limitedly installed and matched, the rear part of the side column 2 is detachably provided with a rear oblique support piece 18, the rear oblique support piece 18 is provided with a fixing nail 19, the lower stopper 6 is detachably provided between the base 1, and the upper baffle 7 is detachably provided on the upper crossbeam 3.

[0029] In this embodiment, the utility model has a simple and reasonable structure. The side column 2 can be detachably mounted on the base 1, the upper crossbeam 3 and the lower crossbeam 4 can be detachably mounted in the mounting groove 8, the vertical railing 5 is respectively plugged with the upper crossbeam 3 and the lower crossbeam 4 through the horizontal insertion hole 9, and can be locked or removed by operating the locking knob 10. The rear part of the side column 2 can be detachably provided with a rear oblique support member 18, the lower stopper 6 can be detachably provided between the base 1, the upper baffle 7 can be detachably provided on the upper crossbeam 3, and the installation or removal between the unit guardrails can be performed by operating the screw cap 15, taking out the card slot sleeve 14 and The connecting piece 13 can be separated and disassembled, and the whole structure makes the base 1, the side column 2, the upper crossbeam 3, the lower crossbeam 4, the vertical railing 5, the lower block 6, the upper baffle 7 and the rear oblique support 18 a detachable structure, which has flexible assembly and disassembly functions, and can be transported in an orderly manner during transportation. Compared with this type of foundation pit guardrail with a larger volume, each component reduces the transportation volume to facilitate transportation, and is also convenient to store and compactly place on a transport vehicle during transportation, greatly increasing the transportation volume of a single vehicle and facilitating transportation; the connecting piece 13 is provided with a slot sleeve 14, and the toothed boss 1 2 installation and matching, when the foundation pit guardrail is installed at the corner of the foundation pit, it is only necessary to adjust the angle between the side columns 2, remove the screw cap 15, pull out the connector 13, so that the slot sleeve 14 is disengaged, and then the angle between the side columns 2 is adjusted, and it is only necessary to adjust the angle of the connector 13 according to the angle between the side columns 2. After adjustment, the slot sleeves 14 of the connector 13 are respectively installed on the toothed protrusions 12. Since the toothed protrusions 12 are fixed, once the tooth portion 17 and the slot 16 are limited and matched, the angle will be locked, and the screw cap 15 plays a longitudinal limiting role. The number of teeth 17 and the slots 16 is set according to the angle adjustment requirements of the foundation pit guardrail, and a single tooth 17 and a slot 16 are used as angle adjustment units. This structure can fit the outer shape of the foundation pit well to adjust the relative angle of the foundation pit guardrail; through the rear oblique support 18, the fixing nails 19 can increase the stability of the ground, achieve an oblique support effect, ensure the strength of the side column 2, and then ensure the strength of the foundation pit guardrail. Even when encountering strong winds or external collisions outdoors, it is not easy to fall over, thereby ensuring the protection effect.

[0030] Specifically, the lower block 6 can increase the weight of the foundation pit guardrail and enhance the vertical strength, and can also protect the lower space of the lower cross beam 4 to ensure a better protection effect. The locking knob 10 is a bolt-type knob structure, which can be tightened manually. The gap and number of the vertical railing 5 are installed as required. Once the tooth portion 17 and the slot 16 are limited and fitted, the slot sleeve 14 and the toothed protrusion 12 are installed at an angle, and the connector 13 is adjusted by rotating the slot sleeve 14, and then installed on the toothed protrusion 12 through the slot sleeve 14. This structure can adjust the angle to a certain extent, but not any angle. Since the angle adjustment accuracy of the foundation pit guardrail is not required, the use of this structure is more practical. The higher the angle accuracy requirement, the more the number of teeth 17 and slots 16 is set. Through the connector 13, the installation between the side columns 2 is more stable, and the angle will be fixed once locked. When the foundation pit guardrail is installed at the corner of the foundation pit, the two side columns 2 are adjacent to each other, and the rear oblique support member 18 of one of the side columns needs to be removed to prevent the rear oblique support members 18 from interfering with each other.

[0031] Furthermore, the base 1 is provided with a square socket 20, a bolt hole 21 and a reinforcing rib 22, the bolt hole 21 is located at the four corners of the base 1, the side column 2 is inserted into the square socket 20, and the outside of the base 1 is provided with a bolt I23 fixed relatively to the side column 2.

[0032] In this embodiment, by installing ground bolts on the bolt holes 21 at the four corners of the base 1, a stable installation structure is achieved with the ground, the base 1 has better ground stability, the square socket 20 has better limiting installation, the bolts I23 can well achieve the fixed installation of the side column 2 and the base 1, and the reinforcing ribs enhance the strength of the base 1.

[0033] Furthermore, a plug-in tube 24 is provided on the side of the base 1 , a horizontal column 25 is inserted into the plug-in tube 24 , the lower stopper 6 is provided between the horizontal columns 25 , and a step surface 26 is provided obliquely at the front of the lower stopper 6 .

[0034] In this embodiment, a step surface 26 is obliquely provided on the lower stopper 6. When an external vehicle accidentally drives onto the foundation pit guardrail, the step surface 26 can decelerate and buffer it, thereby reducing the impact force and improving the functionality of the foundation pit guardrail.

[0035] Furthermore, the front sides of the side posts 2 and the vertical rails 5 are covered with reflective tapes 27 .

[0036] In this embodiment, the reflective tape 27 can play a warning effect at night and improve the warning.

[0037] Furthermore, a through hole 28 is provided on the upper cross beam 3, a lower insert screw 29 is provided at the bottom of the upper baffle 7, a limiting protrusion 30 is provided on the lower insert screw 29, the lower insert screw 29 is inserted into the through hole 28, and a butterfly bolt 31 is threadedly installed on the end of the lower insert screw 29 to lock with the upper cross beam 3.

[0038] In this embodiment, the limiting protrusion 30 plays a role of reference abutment when the lower insert screw 29 is inserted into the through hole 28, so as to facilitate the threaded installation of the butterfly bolt 31 to lock the upper crossbeam 3.

[0039] Furthermore, a sharp tooth portion 32 is provided on the top of the upper baffle plate 7 , and a warning sign 33 is provided on the surface of the upper baffle plate 7 .

[0040] In this embodiment, the sharp teeth 32 can prevent climbing over, and the warning sign 33 can be used to remind people around.

[0041] Furthermore, the mounting groove 8 is provided with an arc-shaped portion 81 , and the upper crossbeam 3 and the lower crossbeam 4 are provided with arc-shaped convex portions 82 that match the arc-shaped portion 81 .

[0042] In this embodiment, the structure is used to achieve horizontal and vertical limited installation, and the installation performance is better.

[0043] Furthermore, a threaded boss 34 is disposed on the toothed boss 12 , and a threaded hole 35 corresponding to the threaded boss 34 is disposed on the screw cap 15 .

[0044] In this embodiment, the screw cap 15 structure can effectively limit the longitudinal position of the slot sleeve 14 of the connecting member 13.

[0045] Furthermore, a rotary handle 36 is provided on the rotary cap 15 .

[0046] In this embodiment, the rotary handle 36 facilitates manual rotation of the rotary cap 15 .

[0047] Furthermore, the rear oblique support member 18 includes an upper plate 37, an oblique plate 38 and a ground docking plate 39 which are integrally arranged. A socket I40 and a socket II41 are arranged at the rear of the side column 2. The upper plate 37 is plugged into the socket I40. A bolt II42 for locking the upper plate 37 is arranged on the side of the socket I40. The fixing nail 19 is installed on the ground docking plate 39. A limiting plug-in block 43 is arranged on the socket II41. A through hole 44 is arranged in the mounting groove 8. The limiting plug-in block 43 is plugged into the through hole 44 and limits the lower cross beam 4. A bolt III45 for locking the limiting plug-in block 43 is arranged on the side of the socket II41.

[0048] In this embodiment, the structure of the rear oblique support member 18 improves the stability of the oblique support. A bolt II42 is provided on the side of the socket I40. By operating the bolt II42, the rear oblique support member 18 can be conveniently disassembled or installed. The limit plug-in block 43 can limit the installation of the lower cross beam 4. Since the upper cross beam 3 and the lower cross beam 4 are respectively plugged into the horizontal plug holes 9 at the upper and lower ends of the vertical railing 5, the upper cross beam 3 and the lower cross beam 4 are locked in relative position. Once the lower cross beam 4 is limitedly installed, the upper cross beam 3 is also limitedly installed.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A foundation pit guardrail for municipal engineering construction, characterized in that: The utility model comprises a base (1), a side column (2), an upper crossbeam (3), a lower crossbeam (4), a vertical railing (5), a lower stopper (6) and an upper stopper (7), wherein the side column (2) is detachably mounted on the base (1), a mounting groove (8) is provided on the side column (2), the upper crossbeam (3) and the lower crossbeam (4) are detachably mounted in the mounting groove (8), the upper and lower ends of the vertical railing (5) are provided with transverse insertion holes (9), the upper crossbeam (3) and the lower crossbeam (4) are respectively plugged into the transverse insertion holes (9), the top and bottom of the vertical railing (5) are provided with locking knobs (10), the side column (2) is provided with a connecting seat (11), the connecting seat (11) is provided with a toothed boss (12), the toothed boss (12) is provided with a locking knob (10), and the locking knob (10) is provided at the top and bottom of the vertical railing (5). A connecting piece (13) is provided, the connecting piece (13) is provided with a slot sleeve (14), the slot sleeve (14) and the toothed boss (12) are relatively limitedly installed and matched, the toothed boss (12) is threadedly installed with a screw cap (15) for locking the slot sleeve (14), the slot sleeve (14) is provided with a plurality of slots (16), the toothed boss (12) is provided with a toothed portion (17), the slots (16) and the toothed portion (17) are limitedly installed and matched, the rear part of the side column (2) is detachably provided with a rear oblique support piece (18), the rear oblique support piece (18) is provided with a fixing nail (19), the lower stopper (6) is detachably provided between the base (1), and the upper baffle (7) is detachably provided on the upper crossbeam (3).

2. The foundation pit guardrail for municipal engineering construction according to claim 1 is characterized in that: The base (1) is provided with a square insertion hole (20), a bolt hole (21) and a reinforcing rib (22), wherein the bolt holes (21) are located at the four corners of the base (1), the side column (2) is inserted into the square insertion hole (20), and the outside of the base (1) is provided with a bolt I (23) fixed relative to the side column (2).

3. The foundation pit guardrail for municipal engineering construction according to claim 1 is characterized by: A plug-in tube (24) is provided on the side of the base (1), a transverse column (25) is inserted into the plug-in tube (24), the lower stopper (6) is arranged between the transverse columns (25), and a step surface (26) is inclinedly provided on the front of the lower stopper (6).

4. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The front sides of the side posts (2) and the vertical railings (5) are covered with reflective tapes (27).

5. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The upper cross beam (3) is provided with a through hole (28), the bottom of the upper baffle plate (7) is provided with a lower insert screw tube (29), a limiting convex ring (30) is provided on the lower insert screw tube (29), the lower insert screw tube (29) is inserted into the through hole (28), and a butterfly bolt (31) is threadedly installed on the end of the lower insert screw tube (29) and is locked with the upper cross beam (3).

6. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: A sharp tooth portion (32) is provided on the top of the upper baffle plate (7), and a warning sign (33) is provided on the surface of the upper baffle plate (7).

7. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The installation groove (8) is provided with an arc-shaped portion (81), and the upper crossbeam (3) and the lower crossbeam (4) are provided with arc-shaped convex portions (82) that match the arc-shaped portion (81).

8. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The tooth-shaped protrusion (12) is provided with a threaded protrusion (34), and the screw cap (15) is provided with a threaded hole (35) corresponding to the threaded protrusion (34).

9. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The screw cap (15) is provided with a screw handle (36).

10. The foundation pit guardrail for municipal engineering construction according to claim 1, characterized in that: The rear oblique support member (18) comprises an upper plate (37), an oblique plate (38) and a ground docking plate (39) which are integrally arranged. A socket I (40) and a socket II (41) are arranged at the rear of the side column (2). The upper plate (37) is plugged into the socket I (40). A bolt II (42) for locking the upper plate (37) is arranged at the side of the socket I (40). The fixing nail (19) is mounted on the ground docking plate (39). A limiting plug-in block (43) is arranged at the socket II (41). An insertion hole (44) is arranged in the mounting groove (8). The limiting plug-in block (43) is plugged into the insertion hole (44) and limits the lower cross beam (4). A bolt III (45) for locking the limiting plug-in block (43) is arranged at the side of the socket II (41).

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