Construction method for realizing intra-field traffic by utilizing foundation pit support in narrow space

Abstract

The invention provides a construction method for achieving in-site traffic through foundation pit supporting in a narrow space. The construction method comprises the following steps that S1, a site is planned in advance; s2, constructing support piles and top beams; s3, vertical column piles and latticed columns are constructed; s4, earthwork is excavated, and a first enclosing purlin is constructed; s5, a first supporting beam and a trestle plate are constructed, and the first supporting beam is connected with the top of the latticed column, so that the supporting pile, the first enclosing purlin, the first supporting beam, the trestle plate and the latticed column form a whole for foundation pit supporting; and S6, a column ring beam and a trestle ramp are constructed, concrete is poured, so that the trestle plate, the latticed column, the trestle ramp and the foundation pit edge connecting part form a whole, and the annular field traffic with an inlet and an outlet is formed in the whole field. On the premise of ensuring the safety of the foundation pit, the available land area of the site is increased by effectively utilizing the foundation pit support, and a large amount of communication, coordination and cost caused by the fact that the site is narrow and has no traffic roads and material storage yards and occupies municipal roads or sites of other people is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of building foundation pit support, and in particular to a construction method for realizing on-site traffic by utilizing foundation pit support in a narrow space. Background Art

[0002] With the development of urbanization, the development and utilization of underground space has been continuously increased, the depth of foundation pits has become deeper and deeper, and the buildings have become more and more dense, so that the area occupied by new buildings has become smaller and smaller or surrounded by other buildings and roads, which has brought difficulties to the excavation and transportation of foundation pits, the stacking of materials on site, and the movement of vehicles. As the number of buildings continues to increase, such situations will become more and more obvious.

[0003] At present, in order to solve such problems, natural slope is used to form traffic roads in large foundation pits. Small foundation pits are mostly excavated and loaded by long-arm excavators due to their shallow depth. However, many new buildings often do not occupy enough space for deep foundation pits, so natural slope and long-arm excavators are used directly for operations. This will undoubtedly greatly reduce the efficiency of foundation pit excavation, transportation, and material storage. Therefore, the setting of on-site transportation and material storage yard in narrow space is a major problem that needs to be solved in the construction field. Summary of the invention

[0004] In order to improve the problem that on-site traffic and material yard cannot be realized in a narrow space, the present application provides a construction method for realizing on-site traffic by using foundation pit support in a narrow space.

[0005] The present application provides a construction method for realizing on-site traffic by using foundation pit support in a narrow space, which adopts the following technical solution:

[0006] A construction method for realizing on-site traffic by using foundation pit support in a narrow space comprises the following steps:

[0007] S1. Plan the site in advance and set up on-site traffic and material storage areas according to the surrounding environment;

[0008] S2. Construction of support piles and crown beams: construction of support piles is carried out outside the foundation pit. After the construction of the support piles is completed, concrete is poured to form a crown beam to connect the plurality of support piles outside the foundation pit into a whole;

[0009] S3. Construction of column piles and lattice columns: welding and fixing the lattice columns to the steel cage, lowering them after cleaning the holes, and then pouring concrete to form column piles and lattice columns;

[0010] S4. Excavate earth and construct the first purlin. When the earth is excavated to the bottom elevation of the first support beam, the first purlin is constructed first. First, holes are drilled on the support piles at the elevation of the first support beam, and then steel bars are embedded. Then, the steel bars of the first purlin are tied, and then concrete is poured to form the first purlin;

[0011] S5. Construct the first support beam and trestle board, perform cushion construction, steel bar binding, formwork manufacturing and installation, concrete pouring, connect the first support beam with the top of the lattice column, and reserve steel bars at the junction of the trestle board and the trestle ramp, so that the support piles, the first purlin, the first support beam, the trestle board and the lattice column form a whole for foundation pit support;

[0012] S6. Construct column ring beams and trestle ramps. Start setting up formwork at the location where the trestle ramp is to be arranged. Add column ring beams to both the trestle ramp and the trestle slab from the reserved steel bars at the end of the trestle slab to the edge of the foundation pit. The column ring beam steel bars and the embedded steel bars on the top of the lattice column are interspersed with each other. After the steel bars are tied, pour concrete to form a whole at the connection between the trestle slab, lattice column, trestle ramp and the edge of the foundation pit. At this point, the entire site forms a circular on-site traffic with one entrance and one exit.

[0013] Furthermore, it also includes:

[0014] S7. Continue to excavate until the foundation pit support is completed, and the trestle ramp construction is completed. After the strength reaches 100% of the design strength, continue to dig down to the space between the negative second floor and the bottom of the foundation pit, and then construct the second purlin first in the same way as steps S4 and S5, and then construct the second support beam, and finally form a complete deep foundation pit support;

[0015] S8. Construction of the base plate. After the construction of the second support beam is completed, excavate the earth to the bottom of the foundation pit, and then start pouring the concrete cushion layer, laying the waterproof membrane, tying the base plate steel bars, and pouring concrete to form the base plate.

[0016] Furthermore, the earth excavated in front of the bottom of the first supporting beam in step S4 can be directly excavated and transported on the site, and after the construction of the trestle ramp in step S6 is completed and a circular traffic is formed on the site, the subsequent earth excavation can be carried out on the trestle board.

[0017] Furthermore, in step S2, after the construction of the supporting piles is completed, the top of the piles is chiseled out to remove the concrete containing impurities, at least 0.5 m, and after the chiseling is completed, the steel bars are tied and the concrete is poured.

[0018] Furthermore, in step S5, before pouring concrete for the first purlin, steel bars must be reserved in advance at the position connected to the first support beam. After the construction of the first purlin is completed, since the excavation depth of the position where the trestle plate is arranged is different from the depth of the first support beam, steel bars must be retained during the excavation.

[0019] Furthermore, in step S6, a hole of the same size as the top of the lattice column is reserved at the position of each lattice column in the trestle ramp template; after the template and the frame are erected, the steel bars are tied, the top of the lattice column is also implanted with steel bars, and the side of the foundation pit at the connection with the trestle ramp also needs to be implanted with steel bars.

[0020] Furthermore, in step S5, the trestle board on the first supporting beam forms a local plane traffic within the field, which can be used for stacking materials and vehicle movement.

[0021] Furthermore, in step S1, it is also necessary to calculate the force analysis to obtain the thickness of the trestle board and the trestle ramp.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The construction method of this application, under the premise of ensuring the safety of deep foundation pit support, plans the on-site traffic route, material stacking site, and vehicle travel road in advance, and then calculates the force analysis to obtain the thickness of the trestle board and the trestle ramp, and increases its strength and rigidity by adding column ring beams (i.e. reinforced concrete beams) to meet the land requirements of excavation transportation, material stacking, etc. in the on-site foundation pit stage;

[0024] 2. This application adopts the design of the trestle board. By using the first supporting beam as a bridge, the trestle board partially forms a complete board surface on the first supporting beam, which can be used as a traffic road, material yard or other land use, increasing the available land area of ​​the construction site and providing a good road surface platform for the construction site;

[0025] 3. This application adopts the design of the trestle ramp, so that the trestle board can be connected to the side of the foundation pit with the help of the trestle ramp to form a complete circular traffic road, providing a good transportation road for vehicles, improving the excavation efficiency at the foundation pit stage, and effectively solving the problem of being unable to realize transportation and material stacking due to the narrow site at the foundation pit stage;

[0026] 4. The overall design of this application, while ensuring the safety of the foundation pit, effectively utilizes the foundation pit support to increase the available land area on site, avoiding a large amount of communication and coordination and expenses caused by occupying municipal roads or other people's sites due to the narrow site without traffic roads and material yards, and efficiently completes the on-site traffic and material stacking operations, improves construction efficiency, reduces costs, and has a high reference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a side sectional view of the overall structure of an embodiment of the present application;

[0029] Figure 2 is a top view of the structure of the trestle board after construction of the embodiment of the present application;

[0030] Figure 3 It is a top view of the structure after the trestle ramp construction of the embodiment of the present application.

[0031] Reference numerals:

[0032] 11. Support piles; 12. Crown beam;

[0033] 21. Lattice column; 22. Column pile;

[0034] 31. The first perimeter purlin; 32. The first supporting beam;

[0035] 4. Trestle board;

[0036] 5. Pier ramp;

[0037] 6. Column ring beam; 61. Short-direction reinforced concrete beam; 62. Long-direction reinforced concrete;

[0038] 71. The second perimeter purlin; 72. The second supporting beam;

[0039] 8. Base plate. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Reference Figure 1 , Figure 2 and Figure 3 The present application embodiment discloses a construction method for realizing on-site traffic by using foundation pit support in a narrow space, which comprises the following steps:

[0042] S1. Plan the site in advance: Before starting a new project, understand the surrounding environment of the site in advance, communicate well with the construction unit and design unit according to actual needs, and propose the best solution for site layout under the conditions of narrow space. It is also necessary to calculate the force analysis to obtain the thickness of the trestle board and the trestle ramp, that is, to ensure good traffic on the site and provide a material yard while ensuring the stability and safety of the foundation pit, so as to meet the site needs.

[0043] S2. Construction of support piles and crown beams: According to the drawings, first carry out the construction of support piles (high-pressure rotary jet piles), use the pile driver to drill holes, lower the steel cage after cleaning the holes, then inspect the pile holes, and pour concrete to form high-pressure rotary jet piles to support the foundation pit. After the construction of the support piles is completed, the top of the pile is chiseled to remove the concrete containing impurities, at least 0.5m above, and after the chiseling is completed, the steel bars are tied and concrete is poured to form the crown beam, so that the multiple support piles outside the foundation pit are connected as a whole.

[0044] S3. Construction of column piles and lattice columns: Use a pile driver to drill holes, make the lattice columns in advance and weld them to the steel cage, lower them after cleaning the holes, and then pour concrete to form column piles and lattice columns. At this time, the height of the lattice columns needs to be designed in advance at the location where the trestle ramp is arranged. Among them, the steel lattice columns are welded by steel plates, angle steels, etc. and are set in the column piles.

[0045] S4. Excavate earth and construct the first perimeter purlin: After the construction of supporting piles, crown beams, column piles and lattice columns is completed, start excavating earth to the first support bottom elevation, and then construct the first perimeter purlin. First, drill holes on the supporting piles at the first support elevation, then embed steel bars, and then tie the steel bars of the first perimeter purlin, and then pour concrete to form the first perimeter purlin.

[0046] S5. Construction of the first supporting beam and trestle slab: Before pouring concrete for the first purlin, steel bars must be reserved in advance at the position connected to the first support. After the construction of the first purlin is completed, the depth of earth excavation at the location where the trestle slab is arranged is different from the depth of the supporting beam position, so it must be reserved during earth excavation. Then, the cushion layer of the first supporting beam and trestle slab, steel bar binding, formwork preparation and installation, and concrete pouring are carried out. The supporting beam is connected to the top of the lattice column; at the same time, steel bars are reserved at the junction of the trestle slab and the trestle ramp; thus, the supporting piles, the first purlin, the first support, the trestle slab and the lattice column form a whole for foundation pit support, and a circular field is formed locally to allow for plane traffic for stacking materials and vehicle movement. The first purlin is used to connect the first supporting beam and the supporting piles; lattice columns are arranged on the first supporting beam at certain intervals; the trestle slab is a slab cast with reinforced concrete in the gap between the first supporting beams on the basis of the first supporting beams, and is arranged on the first supporting beam according to the needs of on-site traffic and material yard planning.

[0047] S6. Construction of column ring beams and trestle ramps: After the construction of the first support beam and trestle slab, the template is set up at the location where the trestle ramp is to be arranged, from the reserved steel bars at the end of the trestle slab to the edge of the foundation pit. At the same time, a hole of the same size as the top of the lattice column needs to be reserved at each lattice column position in this area; after the template and frame are set up, the steel bars are tied, and the top of the lattice column is also implanted with steel bars, and the edge of the foundation pit where it connects with the trestle ramp is also implanted with steel bars; the trestle ramp is added with a column ring beam in the same way as the trestle slab, and the column ring beam steel bars and the embedded steel bars at the top of the lattice column are interlaced; after the steel bars are tied, concrete is poured to form a whole at the connection between the trestle slab, lattice column, trestle ramp and the edge of the foundation pit, so that the entire site forms a circular on-site traffic with one entrance and one exit. Among them, the trestle ramp is an inclined plate made of reinforced concrete according to the designed slope, and the bottom is supported by lattice columns. One end of the trestle ramp is connected to the trestle slab and the other end is connected to the edge of the foundation pit. The column ring beam is a reinforced concrete beam set up to enhance the strength and rigidity of the trestle ramp. It is divided into short-direction reinforced concrete beams and long-direction reinforced concrete beams; thus meeting the walking needs of transport vehicles, and can be calculated and arranged specifically according to the construction requirements of each foundation pit.

[0048] S7. Continue to excavate until the foundation pit support is completed: After the construction of the trestle ramp is completed and the strength reaches 100% of the design strength, continue to dig down to the space between the underground second floor and the bottom of the foundation pit, and then construct the second purlin and the second support beam in the same way as above, and finally form a complete deep foundation pit support.

[0049] S8. Bottom plate construction: After the construction of the second support beam is completed, excavate the earth to the bottom of the foundation pit, and then start pouring the concrete cushion layer, laying the waterproof membrane, tying the bottom plate steel bars, and pouring concrete to form the bottom plate.

[0050] In the above steps, the earth excavated before the bottom of the first supporting beam can be directly excavated and transported on site; after the construction of the trestle ramp is completed and a circular traffic is formed on site, the subsequent excavation can be excavated and transported on the trestle board. This method takes the situation where there is no available land area around the two-layer underground structure, and it is impossible to form traffic on site by natural slope after reaching a certain depth as an example. According to different situations, the position of the trestle board and the trestle ramp can be adjusted according to the depth of the foundation pit, the number of support roads, etc., so that a circular traffic is formed on site and the land requirements for materials, vehicles, etc. in the foundation pit stage are met.

[0051] Therefore, on the one hand, the present application adopts the design of a trestle board, and by utilizing the first supporting beam as a bridge, the trestle board partially forms a complete board surface on the first supporting beam, which can be used as a traffic road, material yard or other land-required uses, thereby increasing the usable land area of ​​the construction site and providing a good road platform for the construction site; on the other hand, the design of a trestle ramp is adopted, so that the trestle board can be connected to the edge of the foundation pit with the help of the trestle ramp to form a complete circular traffic road, providing a good transportation road for vehicles, improving the excavation efficiency in the foundation pit stage, and effectively solving the problem of being unable to realize transportation and material stacking due to the narrow site in the foundation pit stage.

[0052] Therefore, the construction method of the present application, while ensuring the safety of the foundation pit, effectively utilizes the foundation pit support to increase the available land area on site, avoids a large amount of communication and coordination and costs caused by occupying municipal roads or other people's sites due to the narrow site without traffic roads and material yards, efficiently completes on-site traffic and material stacking operations, improves construction efficiency, reduces costs, and has a high reference value.

[0053] The implementation principle of the construction method of the embodiment of the present application for realizing on-site traffic by using foundation pit support in a narrow space is as follows:

[0054] By adopting the design of the trestle board and using the first supporting beam as a bridge, the trestle board can partially form a complete board surface on the first supporting beam, which can be used as a traffic road, material yard or other land-required purposes, increasing the usable land area of ​​the construction site and providing a good road platform for the construction site; further adopting the design of the trestle ramp, the trestle board can be connected to the edge of the foundation pit with the help of the trestle ramp to form a complete circular traffic road, providing a good transportation road for vehicles, improving the excavation efficiency in the foundation pit stage, and effectively solving the problem of being unable to realize transportation and material stacking due to the narrow site in the foundation pit stage.

[0055] Therefore, the construction method of the present application, while ensuring the safety of the foundation pit, effectively utilizes the foundation pit support to increase the available land area on site, avoids a large amount of communication and coordination and costs caused by occupying municipal roads or other people's sites due to the narrow site without traffic roads and material yards, efficiently completes on-site traffic and material stacking operations, improves construction efficiency, reduces costs, and has a high reference value.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for realizing on-site traffic by using foundation pit support in a narrow space, characterized in that: The following steps are involved: S1. Plan the site in advance and set up on-site traffic and material storage areas according to the surrounding environment; S2. Construction of support piles and crown beams: construction of support piles is carried out outside the foundation pit. After the construction of the support piles is completed, concrete is poured to form a crown beam to connect the plurality of support piles outside the foundation pit into a whole; S3. Construction of column piles and lattice columns: welding and fixing the lattice columns to the steel cage, lowering them after cleaning the holes, and then pouring concrete to form column piles and lattice columns; S4. Excavate earth and construct the first purlin. When the earth is excavated to the bottom elevation of the first support beam, the first purlin is constructed first. First, holes are drilled on the support piles at the elevation of the first support beam, and then steel bars are embedded. Then, the steel bars of the first purlin are tied, and then concrete is poured to form the first purlin; S5. Construct the first support beam and trestle board, perform cushion construction, steel bar binding, formwork manufacturing and installation, concrete pouring, connect the first support beam with the top of the lattice column, and reserve steel bars at the junction of the trestle board and the trestle ramp, so that the support piles, the first purlin, the first support beam, the trestle board and the lattice column form a whole for foundation pit support; S6. Construct column ring beams and trestle ramps. Start setting up formwork at the location where the trestle ramp is to be arranged. Add column ring beams to both the trestle ramp and the trestle slab from the reserved steel bars at the end of the trestle slab to the edge of the foundation pit. The column ring beam steel bars and the embedded steel bars on the top of the lattice column are interspersed with each other. After the steel bars are tied, pour concrete to form a whole at the connection between the trestle slab, lattice column, trestle ramp and the edge of the foundation pit. At this point, the entire site forms a circular on-site traffic with one entrance and one exit.

2. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: Also includes: S7. Continue to excavate until the foundation pit support is completed, and the trestle ramp construction is completed. After the strength reaches 100% of the design strength, continue to dig down to the space between the negative second floor and the bottom of the foundation pit, and then construct the second purlin first in the same way as steps S4 and S5, and then construct the second support beam, and finally form a complete deep foundation pit support; S8. Construction of the base plate. After the construction of the second support beam is completed, excavate the earth to the bottom of the foundation pit, and then start pouring the concrete cushion layer, laying the waterproof membrane, tying the base plate steel bars, and pouring concrete to form the base plate.

3. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: The earth excavated in front of the bottom of the first supporting beam in step S4 can be directly excavated and transported on the site, and after the construction of the trestle ramp in step S6 is completed and a circular traffic is formed on the site, the subsequent earth excavation can be carried out on the trestle board.

4. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: In step S2, after the construction of the supporting piles is completed, the top of the piles is chiseled to remove the concrete containing impurities, at least 0.5m above the top, and after the chiseling is completed, the steel bars are tied and the concrete is poured.

5. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: In step S5, before pouring concrete for the first purlin, steel bars must be reserved in advance at the position connected to the first support beam. After the construction of the first purlin is completed, the depth of earth excavation at the position where the trestle plate is arranged is different from the depth of the first support beam position, so steel bars must be retained during earth excavation.

6. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: In step S6, a hole of the same size as the top of the lattice column is reserved at the position of each lattice column in the trestle ramp template; after the template and the frame are erected, the steel bars are tied, the top of the lattice column is also implanted with steel bars, and the side of the foundation pit at the connection with the trestle ramp also needs to be implanted with steel bars.

7. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: In step S5, the trestle board on the first supporting beam forms a local plane traffic in the field, which can be used for stacking materials and vehicles traveling.

8. The construction method for realizing on-site traffic by using foundation pit support in a narrow space according to claim 1, characterized in that: In step S1, it is also necessary to calculate the force analysis to obtain the thickness of the trestle board and the trestle ramp.

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