Reverse vertical shaft structure hollowed out at intervals under loess stratum condition

Abstract

The utility model belongs to the technical field of reverse shafts for civil construction in municipal engineering, and particularly relates to a spaced hollow reverse shaft structure under loess stratum conditions, which comprises a ring beam and an internal support structure. The ring beam is arranged around a vertical shaft opening, and multiple layers of internal supporting structures perpendicular to one another are arranged below the ring beam. The internal supporting structure comprises multiple layers of complete side walls arranged in the horizontal direction, and first spaced side walls and second spaced side walls are alternately arranged between the multiple layers of complete side walls in the vertical direction. Hollow side walls are uniformly distributed between the adjacent first spaced side walls and the adjacent second spaced side walls at a first interval and a second interval respectively; the self-stabilization capacity of the loess stratum is fully utilized, the side walls and the hollowed-out side walls are arranged at intervals, the using amount of concrete is saved, and the engineering concept of low carbon and environmental protection is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of reverse construction shaft for civil construction in municipal engineering, and particularly relates to a reverse construction shaft structure with interval hollowing under loess stratum conditions. BACKGROUND

[0002] With the acceleration of urbanization, the development and utilization of urban underground space becomes increasingly important. In municipal underground engineering, pipe jacking, shield and tunneling construction technologies are widely used, and vertical shaft, as an indispensable part of these technologies, plays an important role in construction. Especially in the loess stratum conditions in northwest China, reverse construction shaft has been widely used in pipe jacking, shield and tunneling engineering due to its unique construction method. However, the traditional reverse construction shaft mostly uses cast-in-place reinforced concrete shaft structure as a temporary retaining structure. After pipe jacking is completed, the main structure is constructed inside the shaft, and then backfilling is carried out. Meanwhile, large-area concrete pouring will increase the construction period, and there are problems such as high cost, resource waste and long construction period, which does not meet the current low-carbon and environmentally friendly engineering concept.

[0003] In the current acceleration of urbanization, the development and utilization of urban underground space is becoming increasingly important. In municipal underground engineering, pipe jacking, shield and tunneling construction technologies are widely used, and vertical shaft, as an indispensable part of these technologies, plays an important role in construction. Especially in the loess stratum conditions in northwest China, reverse construction shaft has been widely used in pipe jacking, shield and tunneling engineering due to its unique construction method. However, the traditional reverse construction shaft mostly uses cast-in-place reinforced concrete shaft structure as a temporary retaining structure. After pipe jacking is completed, the main structure is constructed inside the shaft, and then backfilling is carried out. Meanwhile, large-area concrete pouring will increase the construction period, and there are problems such as high cost, resource waste and long construction period, which does not meet the current low-carbon and environmentally friendly engineering concept. SUMMARY

[0004] The utility model makes full use of the self-stabilizing ability of loess stratum, reduces the amount of concrete through interval hollowing design, and reduces the engineering cost. The utility model aims to make full use of the self-stabilizing ability of loess stratum, reduce the amount of concrete through unique interval hollowing design, and reduce the engineering cost, shorten the construction period, and meet the low-carbon and environmentally friendly concept.

[0005] The utility model discloses a kind of reverse construction shaft structures with hollowed-out interval in loess stratum condition, including ring beam and internal support structure;The ring beam is laid around shaft mouth, and multiple layers of internal support structure perpendicular to each other are arranged below ring beam;The internal support structure includes multiple layers of complete side wall arranged in horizontal direction, and first interval arrangement side wall, hollowed-out side wall and second interval arrangement side wall are vertically arranged between complete side wall respectively;First interval arrangement side wall is vertically arranged between ring beam and first layer complete side wall;First interval arrangement side wall and second interval arrangement side wall are alternately arranged vertically between the rest multiple layers of complete side wall;Hollowed-out side wall is evenly distributed between the first interval arrangement side wall of adjacent with first interval;Hollowed-out side wall is evenly distributed between the second interval arrangement side wall of adjacent with second interval.

[0006] The ring beam has a width of 1000-2000mm and a height of 800-1000mm.

[0007] The ring beam, complete side wall, first interval arrangement side wall and second interval arrangement side wall are all reinforced concrete structures, and the concrete grade is not less than C30.

[0008] The complete side wall, first interval arrangement side wall and second interval arrangement side wall are provided with steel frames, and the steel bars at the upper end of the first interval arrangement side wall on the first layer complete side wall are anchored to the ring beam.

[0009] The first interval of the first interval arrangement side wall and the second interval of the second interval arrangement side wall are different in value, the first interval is 1.0-1.5m, and the second interval is 0.5-0.8m.

[0010] The first interval arrangement side wall and second interval arrangement side wall are alternately arranged with the complete side wall in the shaft side wall, and the hollowed-out side wall retains the original soil body of the shaft wall.

[0011] The excavation depth of each plate of the first interval arrangement side wall or second interval arrangement side wall is not more than 2.0m.

[0012] The structural thickness of the first interval arrangement side wall, second interval arrangement side wall and complete side wall is 400-800mm.

[0013] The steel bars in the hollowed-out side wall, first interval arrangement side wall, second interval arrangement side wall and complete side wall are determined according to specific structural design calculation, and the steel bars are welded and connected between adjacent plates, and the connection length is not less than 10d, wherein d is the diameter of the steel bar. Advantages

[0014] 1. The utility model discloses saved material cost: the utility model discloses through the interval hollow design, reduced the use amount of concrete, compared with traditional cast-in-place reinforced concrete shaft body structure, significantly reduced material cost.

[0015] 2. The utility model discloses shortened construction period: the utility model reduces the concrete pouring amount, correspondingly reduces construction procedure and time, effectively shortens the whole construction period, improves construction efficiency.

[0016] 3. The utility model discloses accords with the environmental protection concept: the utility model reduces material consumption, reduces resource waste, meets the current low carbon environmental protection engineering construction concept, has good social and environmental benefits.

[0017] 4. The utility model discloses guarantees the structure safety: the utility model discloses through reasonable structure design and parameter setting, has guaranteed the structure stability and safety of vertical shaft in loess layer condition, satisfies the engineering use demand.

[0018] The above description is only the summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following detailed description of the preferred embodiments of the utility model and the accompanying drawings as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the following will briefly introduce the drawings needed in the embodiment, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, without creative labor, can also obtain other drawings according to these drawings.

[0020] Figure 1 It is the structure section view schematic diagram of the utility model;

[0021] Figure 2 It is the structure elevation schematic diagram of the utility model.

[0022] In the drawing: 1, ring beam, 2, hollow side wall, 3, first interval arrangement side wall, 4, complete side wall, 5, second interval arrangement side wall. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiment of the utility model will be described clearly and completely in the following by combining the drawings in the embodiment of the utility model, obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of the utility model protection.

[0024] Embodiment:

[0025] As shown in Figure 1 and Figure 2 , an inverse construction shaft structure with interval and hollow under the loess stratum condition comprises a ring beam 1 and an internal support structure; the ring beam 1 is arranged around the shaft opening, and a plurality of layers of internal support structures perpendicular to each other are arranged below the ring beam 1; the internal support structure comprises a plurality of layers of complete side walls 4 arranged in the horizontal direction, and a first interval arrangement side wall 3, a hollow side wall 2 and a second interval arrangement side wall 5 arranged in the vertical direction between the complete side walls 4 respectively; the first interval arrangement side wall 3 is arranged in the vertical direction between the ring beam 1 and the first layer of complete side walls 4; the first interval arrangement side wall 3 and the second interval arrangement side wall 5 are alternately arranged in the vertical direction between the remaining plurality of layers of complete side walls 4; the hollow side walls 2 are evenly arranged at a first interval between adjacent first interval arrangement side walls 3; the hollow side walls 2 are evenly arranged at a second interval between adjacent second interval arrangement side walls 5.

[0026] Further, as shown in Figure 2 , the width of the ring beam 1 is 1000-2000mm, and the height is 800-1000mm.

[0027] Further, as shown in Figure 1 and Figure 2 , the ring beam 1, the complete side wall 4, the first interval arrangement side wall 3 and the second interval arrangement side wall 5 are all reinforced concrete structures, and the concrete grade is not less than C30. In the construction process, the ring beam 1 is first constructed on the ground to improve the overall stiffness of the shaft structure in the inverse construction stage; the first interval arrangement side wall 3, the second interval arrangement side wall 5 and the complete side wall 4 are formed by on-site pouring of reinforced concrete structures.

[0028] Further, the reinforced frame is arranged in the complete side wall 4, the first interval arrangement side wall 3 and the second interval arrangement side wall 5; and the reinforced steel at the upper end of the first interval arrangement side wall 3 arranged on the first layer of complete side walls 4 is anchored to the ring beam 1.

[0029] Further, the first interval between the first interval arrangement side walls 3 and the second interval between the second interval arrangement side walls 5 are different in value; the first interval is 1.0-1.5m, and the second interval is 0.5-0.8m.

[0030] Further, the first interval arrangement side wall 3 and the second interval arrangement side wall 5 are alternately arranged in the shaft side wall according to the designed interval and depth of the complete side wall 4, and are on-site poured after connection, and the hollow side wall retains the original soil body of the shaft wall.

[0031] Further, the first interval arrangement side wall 3 or the second interval arrangement side wall 5 is determined according to geological conditions, excavation depth and surrounding environment by design calculation per plate height, which does not have to be consistent, and the structure thickness and steel bar configuration are determined according to specific structure design calculation. Finally, the steel bars between adjacent plates are connected by welding to ensure the integrity of the structure, construction safety and stability of the stratum.

[0032] Further, the structure thickness of the first interval arrangement side wall 3, the second interval arrangement side wall 5 and the complete side wall 4 is 400-800mm. This thickness range is scientifically designed to effectively guarantee the structural strength and stability.

[0033] Further, the steel bars in the hollow side wall 2, the first interval arrangement side wall 3, the second interval arrangement side wall 5 and the complete side wall 4 are determined according to specific structure design calculation, and the steel bars between adjacent plates are connected by welding, and the connection length is not less than 10d, wherein d is the diameter of the steel bar, which ensures firm connection of the steel bars and improves the overall performance of the structure.

[0034] Further, during on-site construction, 1, first, make construction preparation: according to design requirements, carry out construction site leveling, prepare materials, equipment and personnel required for construction; carry out detailed investigation of loess stratum to further confirm the stratum condition and provide accurate basis for construction; 2, circle beam construction: according to the design position and size, carry out formwork installation and steel bar binding of the circle beam 1; the steel bars should be strictly anchored and connected according to the design requirements to ensure that the steel bar arrangement meets the specifications; when pouring concrete, control the slump and pouring quality of the concrete, and vibrate it tightly to ensure the strength and appearance quality of the circle beam; 3, side wall construction: first, carry out construction of the first interval arrangement side wall 3 and the second interval arrangement side wall 5; according to the design spacing and excavation depth requirements, excavate the earthwork plate by plate, and the excavation depth of each plate is not more than 2.0m; after excavation is completed, timely carry out steel bar binding and formwork installation, and the steel bar connection adopts welding with a connection length not less than 10d; when installing the formwork, ensure the perpendicularity and flatness of the formwork to ensure the accuracy of the side wall size, and then pour and vibrate the concrete tightly; 4, the construction method of the complete side wall 4 is similar to that of the first interval arrangement side wall 3 and the second interval arrangement side wall 5, but attention should be paid to the alternating arrangement relationship with other side walls to ensure correct structure connection; it should be noted that the position between the adjacent first interval arrangement side wall 3 and the second interval arrangement side wall 5 retains the original soil body as the hollow side wall 2 without concrete pouring; 5, quality inspection and acceptance: during construction, quality inspection is carried out for each process, including the specification, quantity and connection quality of the steel bars, the installation quality of the formwork, the pouring quality of the concrete, etc. After construction is completed, the overall structure is accepted according to relevant specifications and design requirements to ensure that the reverse construction shaft structure meets the engineering use requirements.

[0035] In practical application, the interval hollow reverse construction shaft structure can be designed flexibly according to the geological conditions, excavation depth and surrounding environment of specific projects. By optimizing the arrangement and interval of the side wall, the concrete consumption can be further reduced and the investment can be saved. Meanwhile, the structure also has good self-stability and bearing capacity, and can meet the construction requirements of municipal underground projects.

[0036] Compared with the prior art, the interval hollow reverse construction shaft structure under loess layer conditions fully utilizes the self-stability of the loess layer, and the first interval arrangement side wall 3, the second interval arrangement side wall 5 and the hollow side wall 2 are arranged at intervals, the reverse construction shaft wall structure is arranged at intervals, has an effect similar to that of a supporting pile for retaining soil, and has the advantages of simple structure, safety and reliability, convenient construction, low cost, the effect of saving the amount of concrete can be achieved, good social and economic benefits, and the engineering concept of low carbon and environmental protection is met, and has good application prospect in underground projects in the field of city municipal engineering.

[0037] In the case of no conflict, the skilled person in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effect, and the specific combinations are not described one by one here.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0039] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0040] The above is only a preferred embodiment of the present application, and the present application will not be limited to these embodiments shown in the present application, but will conform to the widest range consistent with the principles and novel features disclosed in the present application. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application still belong to the scope of the technical scheme of the present application.

Claims

1. A reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions, characterized in that: It includes a ring beam (1) and an internal support structure; the ring beam (1) is arranged around the shaft opening, and a multi-layered internal support structure is arranged below the ring beam (1); the internal support structure includes a multi-layered complete sidewall (4) arranged horizontally and a first-interval sidewall (3), a hollow sidewall (2) and a second-interval sidewall (5) arranged vertically between the complete sidewalls (4); a first-interval sidewall (3) is arranged vertically between the ring beam (1) and the first layer of complete sidewalls (4); the first-interval sidewall (3) and the second-interval sidewall (5) are arranged alternately vertically between the remaining multi-layered complete sidewalls (4); the hollow sidewalls (2) are evenly distributed between adjacent first-interval sidewalls (3) with a first interval; the hollow sidewalls (2) are evenly distributed between adjacent second-interval sidewalls (5) with a second interval.

2. The reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 1, characterized in that: The ring beam (1) has a width of 1000-2000mm and a height of 800-1000mm.

3. The reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 1, characterized in that: The ring beam (1), the complete side wall (4), the first-interval side wall (3) and the second-interval side wall (5) are all reinforced concrete structures with a concrete grade of not less than C30.

4. The reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 3, characterized in that: A steel frame is laid in the complete side wall (4), the first spaced side wall (3) and the second spaced side wall (5); the steel bars at the upper end of the first spaced side wall (3) laid on the complete side wall (4) of the first layer are anchored to the ring beam (1).

5. The reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 1, characterized in that: The first spacing between the first interval arrangement of side walls (3) is different from the second spacing between the second interval arrangement of side walls (5); the first spacing is 1.0 to 1.5 m, and the second spacing is 0.5 to 0.8 m.

6. The reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 1, characterized in that: The first-interval sidewall (3) and the second-interval sidewall (5) are alternately arranged with the complete sidewall (4) in the vertical shaft sidewall, and the hollow sidewall (2) retains the original soil of the shaft wall.

7. A reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions according to any one of claims 1-6, characterized in that: The excavation depth of each slab of the first-interval sidewall (3) or the second-interval sidewall (5) shall not exceed 2.0m.

8. A reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 7, characterized in that: The structural thickness of the first spaced sidewall (3), the second spaced sidewall (5), and the complete sidewall (4) is 400-800 mm.

9. A reverse-construction vertical shaft structure with intermittent perforation under loess strata conditions as described in claim 8, characterized in that: The steel bars in the hollow side wall (2), the first spaced side wall (3), the second spaced side wall (5) and the complete side wall (4) are determined according to the specific structural design calculation, and the steel bars between adjacent slabs are welded together with a connection length of not less than 10d, where d is the diameter of the steel bar.

Images