CN217419655U - Underground supporting structure system capable of resisting soft plastic red clay - Google Patents
Underground supporting structure system capable of resisting soft plastic red clay Download PDFInfo
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- CN217419655U CN217419655U CN202220704315.4U CN202220704315U CN217419655U CN 217419655 U CN217419655 U CN 217419655U CN 202220704315 U CN202220704315 U CN 202220704315U CN 217419655 U CN217419655 U CN 217419655U
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Abstract
The utility model provides an underground supporting structure system capable of resisting soft plastic red clay, which comprises a first underground supporting structure arranged around a foundation pit and a second underground supporting structure arranged outside the first underground supporting structure, wherein the second underground supporting structure is positioned in a red clay distribution area, the first underground supporting structure and the second underground supporting structure are arranged in parallel and are tightly attached to each other to form a double-layer underground supporting structure system; and the first underground supporting structure and the second underground supporting structure both adopt underground continuous walls. The utility model discloses a geological conditions that the foundation ditch was located is considered to the underground supporting structure system, and in excavation and the stage of building back, double-deck underground supporting structure system undertakes the lateral pressure that whole soil and water pressure and ground overload arouse jointly, can satisfy the foundation ditch construction requirement that there is red clay layer bottom the work well to can guarantee engineering quality and safety.
Description
Technical Field
The utility model relates to a construction technical field specifically, relates to a can resist soft underground supporting structure system of moulding red clay.
Background
In underground construction and deep foundation construction, it is generally required to construct underground diaphragm walls. The underground continuous wall is a widely used foundation pit enclosure structure form in the foundation pit engineering. The underground continuous wall is a continuous reinforced concrete wall jointly built by continuous unit groove sections built section by section and is used as a water intercepting, seepage preventing, bearing and retaining structure. The underground continuous wall is used as a supporting structure in the construction stage and is also used as an outer wall of a future structure, and if the structure of the underground continuous wall does not meet the design requirements, the safety and the quality of engineering can be directly influenced.
Through search, the following results are found:
the application publication number is CN 109555112A's Chinese invention patent, which discloses a structure superposed underground continuous wall and a construction method, the underground continuous wall comprises a plurality of unit prefabricated continuous walls, the unit prefabricated continuous walls comprise post-cast concrete inner cores and prefabricated wall outer frames, the prefabricated wall outer frames comprise superposed part outer wall boards, superposed part inner wall boards, vertical mud-blocking side wall boards and rectangular horizontal lower back covers, and the vertical mud-blocking side wall boards are two and are symmetrically arranged on a group of short edges of the rectangular horizontal lower back covers; the external wall plate of the superposition part, the internal wall plate of the superposition part and the vertical slurry blocking side wall plates arranged at two sides form a groove. The overlapped prefabricated part is integrally manufactured in a prefabricated part factory processing mode, so that the construction space and the preparation time in the early stage of construction are greatly saved, and the overlapped prefabricated part can be synchronously carried out with other constructions. The wall body outside surrounds the wallboard prefabrication, and middle most is cast-in-place, can effectively reduce prefabricated component's dead weight, and the joint adopts cast-in-place between two underground continuous walls, can effectively guarantee the water-proof effects and the atress performance that connect. However, the present invention still has the following problems: the geological condition of the foundation pit is not considered, and the structure of the foundation pit is difficult to meet the design requirement for the foundation pit construction with the red clay layer at the bottom of the working well, so that the engineering quality and the safety can be influenced.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a can resist soft red clay's underground supporting structure system of moulding.
The utility model discloses a realize through following technical scheme:
according to one aspect of the utility model, an underground supporting structure system capable of resisting soft plastic red clay is provided, which comprises a first underground supporting structure arranged around a foundation pit and a second underground supporting structure arranged outside the first underground supporting structure, wherein the second underground supporting structure is positioned in a red clay distribution area, the first underground supporting structure and the second underground supporting structure are arranged in parallel and are tightly attached to each other to form a double-layer underground supporting structure system; and the first underground supporting structure and the second underground supporting structure both adopt underground continuous walls.
Further, the thickness of the first underground supporting structure is 1200 mm; the thickness of the second subterranean support structure is 1000 mm.
Furthermore, the wall panels of the first underground supporting structure are connected through I-shaped steel joints.
Furthermore, the joint of the first underground supporting structure adopts a high-pressure jet grouting pile to stop water.
Further, not less than two grouting pipes are arranged in each first underground supporting structure.
Further, the first underground supporting structure and the second underground supporting structure are both formed by C35 underwater concrete, and the penetration grade is P10.
Further, the minimum thickness of the steel bar protection layers of the first underground supporting structure and the second underground supporting structure is 70 mm.
Further, supplementary grouting is formed between the first underground supporting structure and the second underground supporting structure so as to fill a gap between the first underground supporting structure and the second underground supporting structure.
Furthermore, the insertion depth of the first underground supporting structure and the second underground supporting structure is such that soft plastic red clay is avoided at the bottom of the wall, and when the pit bottom is bedrock, the insertion depth of the first underground supporting structure and the second underground supporting structure into the bedrock below the pit bottom is not less than 3 m.
Furthermore, the deviation of the verticality of the wall body of the underground continuous wall structure is not more than 1/300, the flatness of the surface of the wall body is less than 100mm, and the deviation of the central line of the top of the wall is not more than 30 mm.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a can resist soft underground supporting structure system of moulding red clay, through adopting first underground supporting structure to add second underground supporting structure in the red clay distribution district of work underground, at excavation and return stage of building, first underground supporting structure and second underground supporting structure retaining structure undertake the lateral pressure that whole soil and water pressure and ground overload arouse jointly, can satisfy the foundation ditch construction requirement that there is red clay layer bottom the work shaft, thereby can guarantee engineering quality and safety.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural view of an underground supporting structure system capable of resisting soft plastic red clay in the embodiment of the utility model;
in the figure: the 1 is a first underground supporting structure, and the 2 is a second underground supporting structure.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Referring to fig. 1, the embodiment of the utility model provides a can resist soft underground supporting structure system who moulds red clay, include around the first underground supporting structure 1 that the foundation ditch set up all around, and locate first underground supporting structure 1 outside second underground supporting structure 2, second underground supporting structure 2 is located red clay distribution area, first underground supporting structure 1 and second underground supporting structure 2 parallel arrangement and closely laminate each other, form double-deck underground supporting structure system, first underground supporting structure 1 all adopts the underground continuous wall with second underground supporting structure 2, be first underground continuous wall and second underground continuous wall respectively promptly.
In some specific embodiments, the excavation range of the foundation pit is mainly medium water permeability broken stone and soil clamping according to the drilling details of the construction site of the working well, only red clay exists at the bottom of the east-west side of the foundation pit, and the layer thickness is about 10m at most. The red clay layer has high water content, soft plastic shape, small compression modulus and easy deformation. It is therefore necessary to add a second underground support structure 2 to the east and west sides of the excavation. It will be appreciated that in other embodiments, the skilled person may make any suitable adjustment to the position of the second subterranean formation 2 at the perimeter of the excavation, depending on the geological conditions under which the work well is being constructed. Through adopting first underground supporting structure 1 to add second underground supporting structure 2 in the red clay distribution district in the work pit, the excavation and return stage of building, first underground supporting structure 1 and 2 retaining structures in the second underground supporting structure undertake the lateral pressure that whole soil and water pressure and ground overload arouse jointly, can satisfy the foundation ditch construction requirement that there is red clay layer bottom the work pit, thereby can guarantee engineering safety quality.
In some preferred embodiments, the thickness of the first underground supporting structure 1 is 1200 mm; the thickness of the second subterranean support structure 2 is 1000 mm.
In some preferred embodiments, the first underground supporting structure 1 and the second underground supporting structure 2 are inserted to a depth of not less than 3m from soft plastic red clay at the bottom of the wall, and in particular, for example, the bottom of the underground continuous wall may be inserted into dolomite, and when the pit bottom is bedrock, the first underground continuous wall and the second underground continuous wall are inserted into the bedrock below the pit bottom.
In some preferred embodiments, the depth of the first underground supporting structure 1 is 49m, 44m, 40 m; the depth of the second subterranean formation support structure 2 is 49m, 40 m.
The underground continuous wall is constructed according to the actual construction environment in a sectional and staged arrangement mode, so that a plurality of sections of discontinuous walls are arranged, and finally the discontinuous walls need to be connected by various pouring means, and the structure is called as the joint of the underground continuous wall. In some preferred embodiments, the wall panels of the first underground supporting structure 1 are connected by using i-steel joints. The I-shaped steel joint mode means that the ends of the reinforcing steel bars of adjacent wall panels are bent and inserted into the I-shaped steel, so that slurry leakage during concrete pouring can be prevented, and the I-shaped steel joint mode and the reinforced concrete can bear the lateral pressure of a soil body.
In order to reinforce the red clay layer below the pit bottom and improve the resistance of the passive area, in some preferred embodiments, the joint of the first underground supporting structure 1 is sealed by using a high-pressure jet grouting pile, and further, the type of the high-pressure jet grouting pile may be phi 800@600, that is, the pile diameter interval 600 of 800. Of course, in other embodiments, other types of high-pressure jet grouting piles can be selected according to specific situations and actual needs, as long as the same function as that in the embodiment can be achieved.
In some preferred embodiments, the high-pressure jet grouting pile enters a water-resisting layer by not less than 2m, and the bottom of the pit enters a position which is not less than 2m below the bottom of the pit under the condition of rocks so as to form a bottom-falling type waterproof curtain.
In order to control the vertical settlement of the underground diaphragm wall, in some preferred embodiments, not less than two grouting pipes are arranged in each first underground supporting structure 1. Specifically, the grouting pipe can be a phi 108 multiplied by 4 seamless steel pipe, and is inserted 1m below the wall, the grouting range is 1.5m below the underground continuous wall, the grouting pressure is preferably controlled to be 1.0-1.2 MPa, and the grouting pressure can be further adjusted according to field test data if the grouting pressure cannot meet the requirements.
In order to realize the functions of intercepting, preventing seepage, bearing and retaining water of the underground supporting structures, in some preferred embodiments, the first underground supporting structure 1 and the second underground supporting structure 2 are both formed by C35 underwater concrete, and the penetration grade is P10.
The minimum thickness of the steel bar protection layer is the minimum distance from the outer edge of the outermost steel bar to the surface of the concrete. In order to improve the durability of the underground continuous wall structure, in some preferred embodiments, the minimum thickness of the steel bar protecting layers of the first and second underground supporting structures 1 and 2 is 70 mm.
When constructing the underground diaphragm wall structure, it is preferable to construct the first underground supporting structure 1 first and then the second underground supporting structure 2. When the first underground supporting structure 1 is constructed, the external placement value of the first underground supporting structure 1 is determined according to the construction process level of the first underground supporting structure 1 and the vertical deviation of the construction of the first underground supporting structure 1, and when the first underground supporting structure 1 is grooved, soil on the wall of the first underground supporting structure 1 is grabbed and washed clean, so that the two underground supporting structures are ensured to be closely attached to each other as much as possible, and the effect of common stress is achieved. In some preferred embodiments, when there is a gap between the two underground supporting structures, supplementary grouting is performed between the two underground supporting structures, and supplementary grouting is formed between the first underground supporting structure 1 and the second underground supporting structure 2 to fill the gap between the first underground supporting structure 1 and the second underground supporting structure 2, so that the two underground supporting structures are attached to each other, and the first underground supporting structure 1 and the second underground supporting structure 2 are stressed together.
The main construction processes of the underground continuous wall structure in the embodiment are as follows: construction preparation → measurement lofting → construction guide wall → trenching machine in place → trenching → groove cleaning → groove inspection → reinforcement cage installation → groove cleaning again → concrete pouring → inspection. In order to check whether the quality of the underground continuous wall structure meets the requirement, in some preferred embodiments, the underground continuous wall preferably adopts a sound wave transmission method to detect the quality of the wall body structure, and the detection groove section is not less than 30% of the total groove section number and not less than 3 groove sections. The distance between two adjacent pre-buried sounding pipes is not more than 2m, the inner side and the outer side are alternately arranged, the length of a wall width is not less than 4 when being more than 5m, the length of the wall width is not less than 3 when being less than 5m, the sounding pipes are phi 57 multiplied by 3 seamless steel pipes, the internode joints are in threaded connection, and reliable measures are taken to ensure the smoothness of the sounding pipes and the integrity of pipe walls in the pouring process. And when the quality of the wall body is judged to be unqualified according to the sound wave transmission method, a core drilling method is adopted for verification. In order to ensure the engineering quality and safety, in some preferred embodiments, the deviation of the perpendicularity of the wall body of the underground continuous wall structure is not more than 1/300, the flatness of the surface of the wall body is less than 100mm, and the deviation of the center line of the top of the wall is not more than 30 mm.
The utility model discloses underground continuous wall structure in the above-mentioned embodiment is through adopting first underground supporting structure to add second underground supporting structure in the red clay distribution district of work underground, in excavation and back-building stage, first underground supporting structure and second underground supporting structure retaining structure undertake the lateral pressure that whole soil and water pressure and ground overload arouse jointly, can satisfy the foundation ditch construction requirement that there is red clay layer bottom the work well. After the lining wall is built again and reaches the strength standard, the underground continuous wall structure and the lining wall act together, wherein the underground continuous wall structure bears the soil pressure, and the lining wall bears the water pressure, so that the engineering quality and the safety can be ensured.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the essential spirit of the invention.
Claims (10)
1. The underground supporting structure system capable of resisting soft plastic red clay is characterized by comprising a first underground supporting structure and a second underground supporting structure, wherein the first underground supporting structure is arranged around a foundation pit, the second underground supporting structure is arranged outside the first underground supporting structure, the second underground supporting structure is located in a red clay distribution area, the first underground supporting structure and the second underground supporting structure are arranged in parallel and are tightly attached to each other, and a double-layer underground supporting structure system is formed; and the first underground supporting structure and the second underground supporting structure both adopt underground continuous walls.
2. The underground supporting structure system capable of resisting soft plastic red clay according to claim 1, wherein the thickness of the first underground supporting structure is 1200 mm; the thickness of the second subterranean support structure is 1000 mm.
3. An underground supporting structure system capable of resisting soft plastic red clay according to claim 1, wherein the wall panels of the first underground supporting structure are connected by I-shaped steel joints.
4. An underground supporting structure system capable of resisting soft plastic red clay according to claim 1, wherein the joint of the first underground supporting structure is sealed by high-pressure jet grouting piles.
5. An underground supporting structure system resisting soft plastic red clay according to claim 1, wherein not less than two grouting pipes are arranged in each of the first underground supporting structures.
6. The underground supporting structure system capable of resisting soft plastic red clay as claimed in claim 1, wherein the first underground supporting structure and the second underground supporting structure are both formed by using C35 underwater concrete and have a penetration grade of P10.
7. An underground supporting structure system capable of resisting soft plastic red clay according to claim 1, wherein the minimum thickness of the steel bar protection layer of the first underground supporting structure and the second underground supporting structure is 70 mm.
8. The system of claim 1, wherein a supplemental grout is formed between the first and second subterranean support structures to fill a gap between the first and second subterranean support structures.
9. The underground supporting structure system capable of resisting soft plastic red clay according to claim 1, wherein the insertion depth of the first underground supporting structure and the second underground supporting structure is not less than 3m for avoiding the soft plastic red clay for the wall bottom, and when the pit bottom is bedrock, the first underground supporting structure and the second underground supporting structure are inserted into the bedrock below the pit bottom.
10. The underground supporting structure system capable of resisting soft plastic red clay as claimed in claim 1, wherein the deviation of the verticality of the wall body of the underground continuous wall structure is not more than 1/300, the flatness of the surface of the wall body is less than 100mm, and the deviation of the central line of the top of the wall is not more than 30 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220704315.4U CN217419655U (en) | 2022-03-29 | 2022-03-29 | Underground supporting structure system capable of resisting soft plastic red clay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220704315.4U CN217419655U (en) | 2022-03-29 | 2022-03-29 | Underground supporting structure system capable of resisting soft plastic red clay |
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| CN217419655U true CN217419655U (en) | 2022-09-13 |
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| CN202220704315.4U Active CN217419655U (en) | 2022-03-29 | 2022-03-29 | Underground supporting structure system capable of resisting soft plastic red clay |
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