CN116220062A - Section steel supporting structure for trench excavation and construction method - Google Patents

Abstract

The invention provides a section steel supporting structure for trench excavation and a construction method thereof, comprising channel steel pile structures arranged at two sides of a trench to be excavated, wherein the channel steel pile structures are composed of forward channel steel and reverse channel steel which are alternately arranged in a sleeved mode; the inner side walls of the forward channel steel and the reverse channel steel which are arranged on the same side in a row are fixedly provided with surrounding purlin structures which are arranged along the length direction of the groove to be excavated, and a plurality of groups of inner supports which are horizontally arranged are arranged at equal intervals between the surrounding purlin structures. The supporting structure can form an integral supporting system, and the integrity, stability and sliding resistance of the supporting structure are ensured; the anti-capsizing capability is enhanced, and a safe construction environment can be provided for trench excavation.

Description

Sectional Steel Support Structure and Construction Method for Trench Excavation

technical field

The invention relates to the technical field of trench support construction, in particular to a section steel support structure for trench excavation and a construction method.

Background technique

The existing form of trench excavation and support in the residential area mainly adopts channel steel support, and channel steel is usually arranged closely or at intervals to form a temporary support structure for foundation pits. Its disadvantages are: in the case of poor soil quality or the presence of groundwater, it cannot effectively prevent the trench from collapsing or anti-seepage, and at the same time, it is slightly insufficient in the integrity, stability, anti-sliding, and overturning capabilities of the support; The section cannot be driven into the soil successfully, and the supporting structure cannot be formed.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a steel support structure and construction method for trench excavation. This support structure can form an integral support system, which ensures the integrity, stability and sliding resistance of the support; Enhanced anti-overturning ability, can provide a safe construction environment for trench excavation.

In order to realize above-mentioned technical characterictic, the object of the present invention is achieved like this: the section steel supporting structure of trench excavation, it comprises the channel steel pile structure that is arranged on the both sides of the trench to be dug, and described channel steel pile structure is formed by positive It is composed of forward channel steel and reverse channel steel which are laid alternately in reverse fit; the inner side walls of the forward channel steel and reverse channel steel which are arranged in rows on the same side are fixed with grooves arranged along the length direction of the groove to be dug The surrounding purlin structure has multiple groups of horizontally arranged internal supports arranged at equal intervals between the surrounding purlin structures.

The drilling part of the forward channel steel is pre-drilled with pre-pilot holes, and the pre-pilot holes are arranged at equal intervals; and the pre-pilot holes adopt a ring hole structure that only drills holes and does not take soil.

Both the forward channel steel and the reverse channel steel are made of channel steel material, and the length is 4-9m.

The purlin structure includes an upper section steel and a lower section steel arranged in parallel, and the upper section steel and the lower section steel are respectively welded and fixed on the inner wall of the channel steel pile structure by welding; the other ends of the upper section steel and the lower section steel are welded to the The internal support is welded and fixed.

Both the upper section steel and the lower section steel are cut from I-shaped steel, and a reinforcement plate is arranged between the lower section steel and the channel steel pile structure.

The bottom of the trench to be dug is replaced by a replacement layer after the excavation is completed, and the contact surface between the replacement layer and the channel steel pile structure is isolated by a linoleum layer; the top center of the replacement layer is passed through a pipe The support seat supports the pipe.

An intercepting ditch is arranged on the ground foundation of the trench to be dug and outside the channel steel pile structure.

The purlin structure and internal support are arranged within the range of 0.5m~0.6m below the ground foundation.

The construction method of the section steel supporting structure of described trench excavation is characterized in that, comprises the following steps:

Step 1, drilling of pre-pilot holes:

According to the width of the forward channel steel and the reverse channel steel, drill pre-pilot holes arranged at equal intervals on both sides of the trench to be excavated;

Step 2, punching of forward channel steel and reverse channel steel:

After the pre-pilot hole is drilled, the forward channel steel and the reverse channel steel are driven into the pre-pilot hole in the arrangement of forward and reverse nesting alternately, and then an integral channel steel pile structure is formed;

Step 3, excavation of the topsoil of the trench to be dug:

After the preliminary laying of the channel steel pile structures on both sides is completed, the soil layer between the channel steel pile structures on both sides shall be excavated downward for at least 0.9m-1.2m;

Step 4, fixation of purlin structure:

Weld and fix the purlin structure on the inner wall of the channel steel pile structure and within 0.5m~0.6m below the ground foundation;

Step five, fixation of internal support:

Between the surrounding purlin structures on both sides, and along the length direction of the trench to be dug, internal supports are fixed at equal intervals, and then the channel steel pile structure, surrounding purlin structure and internal supports constitute an overall support system;

Step 6, further excavation construction of the trench to be dug:

After the construction of the overall support system is completed, the remaining height of the trench to be excavated shall be further excavated until its design elevation;

Step 7, replace the bottom of the trench to be dug;

After the excavation of the trench to be dug is completed, the bottom of the trench to be dug is replaced to form a replacement layer, and then the pipeline is supported and arranged on the top of the replacement layer by the pipe support seat.

The replacement layer adopts sand cushion, crushed stone cushion or concrete cushion.

The present invention has beneficial effects:

1. By adopting the steel support structure for trench excavation of the present invention, a complete support system can be formed, which is stronger in the integrity, stability, anti-sliding and overturning capabilities of the support, and can provide safety for trench excavation. construction environment.

2. The stability of the channel steel pile structure formed by using the forward channel steel and the reverse channel steel which are alternately laid by positive and negative sleeves is ensured, and its impermeability performance is enhanced.

3. Through the above-mentioned pre-piercing holes, it is convenient to drill the forward channel steel in the future, and it can effectively prevent the problem of skewing or skewing.

4. Through the purlin structure, the forward channel steel and reverse channel steel on the same side can form a stable support.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is a top view of the channel steel pile structure of the present invention.

Fig. 2 is a sectional view of the supporting structure of the present invention.

Fig. 3 is a partially enlarged view of the connection between the purlin structure and the channel steel pile structure of the present invention.

In the figure: forward channel steel 1, pre-pilot hole 2, reverse channel steel 3, ground foundation 4, intercepting ditch 5, purlin structure 6, internal support 7, pipe 8, pipe support seat 9, replacement layer 10 , linoleum layer 11, upper section steel 12, trench to be dug 13, channel steel pile structure 14, stiffener plate 15, lower section steel 16.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Example 1:

Please refer to Fig. 1-3, the section steel supporting structure of trench excavation, it comprises the channel steel pile structure 14 that is arranged on the both sides of trench 13 to be dug, and described channel steel pile structure 14 is driven alternately by positive and negative nesting The set forward channel steel 1 and the reverse channel steel 3 are formed; the inner side walls of the forward channel steel 1 and the reverse channel steel 3 arranged in rows on the same side are fixed with grooves arranged along the length direction of the trench 13 to be dug. Purlin structures 6, multiple sets of horizontally arranged internal supports 7 are arranged at equal intervals between the purlin structures 6 . By adopting the steel support structure for trench excavation of the present invention, a complete support system can be formed, which is stronger in the integrity, stability, anti-sliding and overturning capabilities of the support, and can provide a safe construction environment for trench excavation .

Further, the drilling position of the forward channel steel 1 is pre-drilled with pre-pilot holes 2, and the pre-pilot holes 2 are arranged at equal intervals; hole structure. By adopting the above-mentioned pre-piercing hole 2, it is convenient for the subsequent drilling arrangement of the forward channel steel 1, which improves the subsequent drilling efficiency and prevents the problem of skewing.

Further, the forward channel steel 1 and the reverse channel steel 3 are both made of channel steel material, with a length of 4-9m. The above-mentioned channel steel can form a stable groove support, thereby ensuring the stability and reliability of the support.

Further, the purlin structure 6 includes upper section steel 12 and lower section steel 16 arranged in parallel, and the upper section steel 12 and the lower section steel 16 are respectively welded and fixed on the inner wall of the channel steel pile structure 14 by means of welding; the upper section steel 12 And the other end of the lower section steel 16 is welded and fixed with the internal support 7 by welding. Through the purlin structure 6 mentioned above, the channel steel pile structures 14 on the same side can be connected to form an integral structure.

Further, both the upper profiled steel 12 and the lower profiled steel 16 are cut from I-shaped steel, and a stiffener plate 15 is arranged between the lower profiled steel 16 and the channel steel pile structure 14 . The stability and reliability of supporting the inner support 7 are ensured by the above-mentioned upper section steel 12 and lower section steel 16 .

Further, the bottom of the trench 13 to be dug is replaced by a replacement layer 10 after the excavation is completed, and the contact surface between the replacement layer 10 and the channel steel pile structure 14 is isolated by a linoleum layer 11; The top center of the replacement layer 10 is supported by a pipe 8 through a pipe support seat 9 . The stability of the bottom of the trench 13 to be dug is guaranteed by adopting the above-mentioned replacement layer 10 .

Further, on the ground foundation 4 of the trench 13 to be dug, and outside the channel steel pile structure 14, a water intercepting ditch 5 is provided. The above-mentioned intercepting ditch 5 can serve the purpose of water diversion, improving the effect of seepage prevention and diversion.

Further, the purlin structure 6 and the internal support 7 are arranged within a range of 0.5m~0.6m below the ground foundation 4 . Through the above arrangement distance, a stable support can be formed on the top of the channel steel pile structure 14, thereby ensuring the stability and reliability of the retaining wall structure formed by it.

Example 2:

The construction method of the section steel supporting structure of described trench excavation, comprises the following steps:

Step 1, drilling of pre-pilot hole 2:

According to the width dimension of the forward channel steel 1 and the reverse channel steel 3, drill holes 2 arranged at equal intervals on both sides of the trench 13 to be dug;

Step 2, punching forward channel steel 1 and reverse channel steel 3:

After the pre-pilot hole 2 is drilled, the forward channel steel 1 and the reverse channel steel 3 are drilled into the pre-pilot hole 2 in the way of forward and reverse nesting alternately, so as to form an integral channel steel pile Structure 14;

Step 3, excavation of the topsoil of the trench 13 to be dug:

After the preliminary setting of the channel steel pile structures 14 on both sides is completed, the soil layer between the channel steel pile structures 14 on both sides is excavated downward for at least 0.9m-1.2m;

Step 4, fixation of purlin structure 6:

On the inner wall of the channel steel pile structure 14, the purlin structure 6 is welded and fixed within the range of 0.5m~0.6m below the ground foundation 4;

Step 5, fix the inner support 7:

Between the surrounding purlin structures 6 on both sides, the internal support 7 is fixed at equal intervals along the length direction of the trench 13 to be dug, and then the channel steel pile structure 14, the surrounding purlin structure 6 and the internal support 7 form an overall support system ;

Step 6, further excavation construction of the trench 13 to be dug:

After the construction of the overall support system is completed, the remaining height of the trench 13 to be excavated is further excavated until its design elevation;

Step 7, filling the bottom of the trench 13 to be dug;

After the excavation of the trench to be dug 13 is completed, the bottom of the trench to be dug 13 is replaced to form a replacement layer 10 , and then the pipeline 8 is supported by the pipe support seat 9 on the top of the replacement layer 10 .

The replacement layer 10 adopts a sand cushion, gravel cushion or concrete cushion.

Claims (10)

1. The section steel support structure for trench excavation is characterized in that it includes channel steel pile structures (14) arranged on both sides of the trench to be dug (13), and the channel steel pile structures (14) consist of positive, It is composed of forward channel steel (1) and reverse channel steel (3) which are laid alternately in reverse fit; it is located on the inner wall of the forward channel steel (1) and reverse channel steel (3) arranged in rows on the same side Purlin structures (6) arranged along the length direction of the trench to be excavated (13) are fixed, and multiple sets of horizontally arranged internal supports (7) are arranged at equal intervals between the purlin structures (6). 2. The profiled steel support structure for trench excavation according to claim 1, characterized in that, the drilling part of the forward channel steel (1) is pre-drilled with a pre-pilot hole (2), and the pre-pilot hole (2) is drilled in advance. The holes (2) are arranged at equal intervals; and the pre-pilot holes (2) adopt a ring hole structure in which only holes are drilled and soil is not taken. 3. The profile steel support structure for excavating trenches according to claim 1, characterized in that, both the forward channel steel (1) and the reverse channel steel (3) are made of channel steel materials, and the length It is 4-9m. 4. The profile steel support structure for trench excavation according to claim 1, characterized in that, the purlin structure (6) comprises upper profile steel (12) and lower profile steel (16) arranged in parallel, and the upper profile steel (12 ) and the lower section steel (16) are respectively welded and fixed on the inner wall of the channel steel pile structure (14); the other ends of the upper section steel (12) and the lower section steel (16) are welded to the internal support (7 ) fixed by soldering. 5. The profiled steel support structure for trench excavation according to claim 4, characterized in that, both the upper profiled steel (12) and the lower profiled steel (16) are cut from I-shaped steel, and the lower profiled steel (16) ) and the channel steel pile structure (14) are provided with reinforcing ribs (15). 6. The profiled steel support structure for trench excavation according to claim 1, characterized in that the bottom of the trench to be dug (13) is replaced by a replacement layer (10) after the excavation is completed, and the replacement The contact surface between the fill layer (10) and the channel steel pile structure (14) is isolated by a linoleum layer (11); the top center of the replacement layer (10) is supported by a pipe (8) through a pipe support seat (9) ). 7. The profiled steel support structure for trench excavation according to claim 1, characterized in that, on the ground foundation (4) of the trench to be dug (13) and on the outside of the channel steel pile structure (14), a Cutting ditch (5). 8. The profiled steel support structure for trench excavation according to claim 7, characterized in that, the purlin structure (6) and internal support (7) are set at 0.5m~0.6m below the ground foundation (4) within range. 9. The construction method of the profiled steel support structure of trench excavation described in any one of claims 1-8, is characterized in that, comprises the following steps: Step 1, drilling of pre-pilot holes (2): According to the width of the forward channel steel (1) and the reverse channel steel (3), drill pre-pilot holes (2) at equal intervals on both sides of the trench to be dug (13); Step 2, punching forward channel steel (1) and reverse channel steel (3): After the pre-pilot hole (2) is drilled, the forward channel steel (1) and the reverse channel steel (3) are punched into the pre-pilot hole (2) in the arrangement of forward and reverse nesting alternately, Then an integral channel steel pile structure (14) is formed; Step 3, excavating the topsoil of the trench (13) to be dug: After the initial laying of the channel steel pile structures (14) on both sides is completed, excavate the soil layer between the channel steel pile structures (14) on both sides downward for at least 0.9m-1.2m; Step 4, fixation of purlin structure (6): on the inner wall of the channel steel pile structure (14), and weld and fix the purlin structure (6) within the range of 0.5m~0.6m below the ground foundation (4); Step five, fixing the internal support (7): Between the surrounding purlin structures (6) on both sides, and along the length direction of the trench to be dug (13), the internal supports (7) are fixed at equal intervals, and then the channel steel pile structure (14), the surrounding purlin structure (6 ) and internal support (7) constitute the overall support system; Step 6, further excavation construction of the trench to be dug (13): After the construction of the overall support system is completed, the remaining height of the trench to be excavated (13) is further excavated until its design elevation; Step 7, filling the bottom of the trench to be dug (13); After the excavation of the trench to be dug (13) is completed, the bottom of the trench to be dug (13) is replaced to form the replacement layer (10), and then the pipe support seat ( 9) Support setting pipe (8). 10. The construction method of the sectioned steel support structure excavated by trenches according to claim 9, characterized in that, the replacement layer (10) adopts a sand cushion, a crushed stone cushion or a concrete cushion.

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