CN217974414U - Support replacing structure in stage-crossing back construction of deep and large foundation pit partitions - Google Patents

Abstract

The utility model belongs to a deep and large foundation ditch subregion strides stage and returns and build in trading and prop structure in city underground space development field. The technical scheme is as follows: a bottom plate structure and an inner horizontal supporting structure are sequentially arranged in the foundation pit support structure from bottom to top; the support changing transition structure is arranged between a first building area in the foundation pit and a second building area in the foundation pit, and comprises an inclined support changing structure and a support changing plate wall fixed on the bottom plate structure; the support plate replacing walls are double walls which are arranged oppositely and comprise a left support plate replacing wall and a right support plate replacing wall; the inner horizontal supporting structure is broken by the support plate replacing wall, and the inner horizontal supporting structure of the rear reclamation area in the foundation pit is fixedly connected with the left support plate replacing wall; the slant trades and props the structure setting and returns to building the district earlier in the foundation ditch, connects right side and trades vaulting board wall and bottom plate structure. On the premise of non-partitioned excavation, the support can be dismantled and built back in multiple stages in a specific area, and meanwhile, a new support replacing system which is stable and reliable in other remaining area supporting systems is guaranteed.

Description

Support replacing structure in stage-crossing back construction of deep and large foundation pit partitions

Technical Field

The utility model belongs to city underground space development field especially relates to be used for returning in advance to build a kind of required use of local major structure fast and trade in the deep foundation ditch and prop the structure.

Background

With the urbanization development of China, various super high-rise buildings emerge endlessly, the construction period of the buildings in the project is relatively urgent, and the progress of the buildings is possibly restricted by the commercial requirements or the promotion of other peripheral major municipal works. At present, a development idea of 'pit division excavation and partition return construction' is generally adopted for a core area with higher progress demand. However, the method needs to additionally increase the separation piles (walls) and arrange independent support systems in each partition, and the technical route has great influence on the overall construction period and the total cost; meanwhile, as the depth and the scale of the foundation pit are also developed in a deep and large direction, the construction period of the basement with a large scale is usually long, if pit division construction is adopted, the construction period is further increased, the construction period is more easily influenced by factors such as important social activities, important traffic control and the like, and the irreparable force factor in the period can cause that the basement in the core area can not be built according to the original plan, and even can not be recovered.

The conventional sequential construction method of the deep and large foundation pit is accompanied with the removal of the support and the corresponding support replacement in sequence, and the usually adopted support removal and replacement means is to replace an inner support structure system through a certain technical scheme, so that the safety of the foundation pit and the structure in the process of removing the inner support is ensured, and the essence is the readjustment, transfer and distribution of the stress of the foundation pit. However, along with the process of basement excavation construction, the condition that project schedule needs to be adjusted sometimes takes place, and the general back construction technical route at present is comparatively linear and single, and the next bearing structure is dismantled after the one deck major structure reaches the intensity of designing requirement promptly, if there is objective compression demand in the project back construction progress, except the increase of constructor, material, machine input, is difficult to make more nimble adjustment from the design operating mode. Therefore, the research of a support changing technical route which not only reduces the excavation subareas of the foundation pit and saves the construction cost, but also can furthest advance the back construction progress of the core area becomes one of the urgent requirements of the subsequent foundation pit engineering development.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a deep and large foundation ditch subregion strides stage and returns to building in trade and prop structure. On the premise of non-partitioned excavation, the support can be dismantled and built back in multiple stages in a specific area, and meanwhile, a new support replacing system which is stable and reliable in other support systems in other residual area areas is ensured.

The technical scheme of the utility model is that: a support replacing structure in a deep and large foundation pit partition cross-stage reclamation is characterized in that a bottom plate structure and an inner horizontal support structure are sequentially arranged in a foundation pit support structure from bottom to top; the support changing transition structure is arranged between a first building area in the foundation pit and a second building area in the foundation pit, and comprises an inclined support changing structure and a support changing plate wall fixed on the bottom plate structure; the support plate replacing walls are double walls which are arranged oppositely and comprise a left support plate replacing wall and a right support plate replacing wall; the inner horizontal supporting structure is broken by the support plate changing wall, and the inner horizontal supporting structure of the back building area in the foundation pit is fixedly connected with the left support plate changing wall; the slant trades to prop the structure setting and is returned in the district of building earlier in the foundation ditch, connects the right side and trades vaulting board wall and floor structure.

Based on the technical characteristics: the inclined support changing structure comprises an inclined support changing rod.

Based on the technical characteristics: the inclined support changing structure further comprises a support changing upright post which is fixed on the bottom plate structure; the diagonal bracing rods and the bracing upright posts form a force transmission structure together, and the right bracing plate wall and the bottom plate structure are connected.

Based on the technical characteristics: and stress and deformation monitoring devices are arranged on the support plate wall and the inclined support structure.

And in the stage of dismantling the support and building the basement back in the foundation pit, the stress and deformation of the support plate wall, the inclined support rods and the horizontal support structure are monitored in real time, and when the stress or deformation of the structure is too large and exceeds a monitoring alarm value, the quantity of the inclined support rods can be increased, the stress of the foundation pit support structure is reduced, and the safety of the foundation pit is ensured.

The technical scheme mainly provides a novel foundation pit return construction route aiming at deep and large foundation pits of a multi-support system, and seeks new breakthrough and feasibility in the traditional simplified return construction working condition. The multi-support system is integrally supported to a partial structure constructed in advance by arranging the support change transition area with a certain scale, so that the purpose of quickly building a local core area is achieved.

The support plate replacing wall is planted on the bottom plate structure and arranged layer by layer, and the plane layout of the support plate replacing wall and the inclined support replacing structure depends on the plane layout between the inner horizontal supports.

In the stage of dismantling, supporting and building the deep and large foundation pit, the reliable support replacing system is a prerequisite condition for dismantling, supporting and building the deep and large foundation pit; the utility model provides a trade and prop structure primary action is the balanced load transmission who props the former braced system in stage of tearing open to ensure foundation ditch envelope's security, make it can not lead to the foundation ditch to warp potential safety hazard even because local support is demolishd. On the premise that the local support is orderly dismantled, the local basement is firstly quickly built.

To sum up, through the utility model discloses a subregion is striden stage and is returned the structure of propping that trades in building and make in the deep basal pit load of interior horizontal support system can be through should trading the underground major structure that props the structure transmission and return the region in advance and build in, ensure that the horizontal support structure that the surplus was not torn open still can support envelope. The underground main structure of the first building area can be used as a support structure of the enclosure structure on the other side. The water and soil pressure on the two sides is always kept balanced through the support plate wall and the inclined support structure. The foundation pit can be quickly built in advance in a specific area on the premise of not dividing the pit for excavation.

Drawings

Fig. 1 is a schematic sectional view of a foundation pit enclosure, an inner horizontal supporting structure, a supporting plate wall, an inclined supporting structure and an underground structure layer in the embodiment of the invention.

Fig. 2 is the embodiment of the utility model provides a step two foundation ditch retaining structure, interior horizontal bearing structure, trade the wall of vaulting pole, slant trade the section of vaulting pole structure, underground structure layer and arrange the schematic diagram.

Fig. 3 is the embodiment of the utility model provides a step three foundation ditch retaining structure, interior horizontal bearing structure, trade the wall of vaulting pole, slant trade the section of vaulting pole structure, underground structure layer and arrange the schematic diagram.

Fig. 4 is the embodiment of the utility model provides a step four foundation ditch envelope, interior horizontal bearing structure, trade the wall of vaulting pole, slant trade the section of vaulting pole structure, underground structure layer and arrange the schematic diagram.

Fig. 5 is the embodiment of the utility model provides a step five foundation ditch retaining structure, interior horizontal bearing structure, trade the wall of vaulting pole, slant trade the section of vaulting pole structure, underground structure layer and arrange the schematic diagram.

Fig. 6 is the embodiment of the utility model provides a profile layout schematic diagram of foundation ditch envelope, interior horizontal bearing structure, trade the breast wall, the slant trades prop structure, underground structure layer in step six.

Fig. 7 is a schematic plan view of the inner horizontal supporting structure, the supporting wall, and the inclined supporting structure of the embodiment of the present invention.

The reference numbers in the figures denote: the foundation pit support structure comprises a foundation pit support structure 1, a first inner horizontal support structure 2, a second horizontal support structure 3, a third horizontal support structure 4, a first support plate wall 5, a second support plate wall 6, a third support plate wall 7, a first inclined support rod 8, a second inclined support rod 9, a third inclined support rod 10, a first support column 11, a second support column 12, a bottom plate structure 13, a first floor structure 14 and a second floor structure 15.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The utility model discloses it is main to provide a dark big foundation ditch subregion to multichannel support system and stride stage and return the structure of propping that trades in building. New breakthroughs and feasibility are sought in the traditional and simplified construction work condition. On the premise of non-partitioned excavation, the support can be dismantled and built back in multiple stages in a specific area, and meanwhile, a new support replacing system which is stable and reliable in other support systems in other residual area areas is ensured. Namely, the multi-channel supporting system is integrally replaced and supported to a part of the structure constructed in advance by arranging the replacement support transition area, so that the purpose of quickly building a local core area is achieved. The following is specifically set forth in conjunction with the appended drawings:

as shown in fig. 1, a bottom plate structure 13, a third inner horizontal supporting structure 4, a second inner horizontal supporting structure 3 and a first inner horizontal supporting structure 2 are sequentially arranged in a foundation pit support structure 1 from bottom to top; the support-replacing transition structure is arranged between a first building-back area in the foundation pit and a second building-back area in the foundation pit, and comprises an inclined support-replacing structure and a support-replacing plate wall fixed on a bottom plate structure 13, wherein the first support-replacing plate wall 5 is shown in fig. 1; the support-replacing plate walls are double walls which are arranged oppositely and comprise a left support-replacing plate wall and a right support-replacing plate wall; the third inner horizontal supporting structure 4 is broken by the support plate changing wall, and the inner horizontal supporting structure of the rear reclamation area in the foundation pit is fixedly connected with the left support plate changing wall; the inclined support replacing structure is arranged in a first building area in a foundation pit, and a first inclined support replacing rod 8 shown in figure 1 is connected with a right support replacing plate wall and a bottom plate structure 13.

As shown in fig. 3, the shoring-replacing board wall has two layers, including a first shoring-replacing board wall 5 and a second shoring-replacing board wall 6. The inclined strut replacing structure comprises a first inclined strut replacing rod 8, a second inclined strut replacing rod 9 and a first strut replacing column 11. The second inclined strut 9 is connected with the second strut-replacing wall 6 and the bottom plate structure 13 through the force transmission of the first strut-replacing upright 11.

As shown in fig. 5, the shoring-replacing board wall has three layers, including a first shoring-replacing board wall 5, a second shoring-replacing board wall 6 and a third shoring board wall 7. The inclined support replacing structure comprises a first inclined support replacing rod 8, a second inclined support replacing rod 9, a third inclined support replacing rod 10, a first support replacing column 11 and a second support replacing column 12. The third diagonal bracing strut 10 excessively completes the connection of the third bracing strut wall 7 and the bottom plate structure 13 through the force transmission of the second bracing strut 12.

Each inclined strut and each strut-replacing column in fig. 1 to fig. 6 are only schematic, can be flexibly arranged according to the actual situation of the engineering, and have the function of supporting the strut-replacing wall to complete the load transfer between the first inner horizontal supporting structure 2, the second horizontal supporting structure 3, the third horizontal supporting structure 4, the bottom plate structure 13, the first floor structure 14 and the second floor structure 15. The design thickness and the reinforcing bars of the support replacing structure are determined according to the calculated loads of the foundation pit support structure 1 and the inner horizontal support structure; and constructing the support plate wall, the inclined support structure and the underground structure in the foundation pit from bottom to top in sequence.

Fig. 7 is a plan view of a third layer of a support wall, wherein the left end of the third support wall 7 is connected with the right end of the first inner horizontal support structure 2, the left end of the third diagonal support rod 10 is connected with the right end of the support wall, and the third diagonal support rod 10 is connected with the first support column 11 and the second support column 12. Taking fig. 7 as an example, the diagonal bracing change structures are symmetrically arranged on both sides of the inner horizontal bracing structure.

The construction method of the embodiment comprises the following steps:

the method comprises the following steps: as shown in fig. 1, after the bottom plate structure 13 of the foundation pit is completed, the first support plate replacing wall 5 and the first inclined support replacing structure are constructed, and the first inclined support replacing rod 8 is connected with the first support plate replacing wall 5 and the bottom plate structure 13;

step two: as shown in fig. 2, the third inner horizontal supporting structure 4 in the first reclamation area in the foundation pit is removed and is reclaimed upwards to the first floor structure 14;

step three: as shown in fig. 3, constructing a second support-replacing plate wall 6, a second inclined support-replacing rod 9 and a first support-replacing upright post 11; the second inclined support-replacing wall 6 and the bottom plate structure 13 are connected through a second inclined support-replacing rod 9 and a first support-replacing upright post 11;

step four: as shown in fig. 4, the second inner horizontal supporting structure 3 in the first reclamation area in the foundation pit is removed and is reclaimed upwards to the second floor structure 15;

step five: as shown in fig. 5, a third support-replacing plate wall 7, a third diagonal support-replacing rod 10 and a second support-replacing upright post 12 are constructed;

step six: and (3) removing the first horizontal supporting structure 2 of the firstly built area in the foundation pit, continuously building the main structure upwards, finally realizing the local firstly built area of the deep and large foundation pit, completing partial areas with higher construction period requirement on the premise of safety, and completing all underground structures in the rest basements step by step in the follow-up process.

In the technical scheme, the supporting plate wall, the inclined supporting rod and the supporting upright post are adopted to form the supporting system in the middle of the inner supporting structure span, so that the load of the rest horizontal supporting structure after being dismantled is mutually balanced and transmitted with the base plate and the floor structure which are built in advance, the partial inner supporting structure can be dismantled in advance, and the rapid building of the local underground structure is finally realized.

In the first, third and fifth steps, when the support plate replacing wall and the inclined support rod are constructed, a monitoring device for measuring the stress and deformation of the foundation pit enclosure structure is embedded in the support plate replacing wall and the inclined support rod; in the second, fourth and sixth steps, a monitoring device for measuring the stress and deformation of the horizontal support system is buried in the main structure while the main structure of each layer is constructed; the stress and deformation of the foundation pit support structure and the horizontal support system are monitored in real time in the whole process of excavation of the foundation pit, and when the stress or deformation of the foundation pit support structure or the horizontal support system is too large and exceeds a monitoring alarm value, the inclined strut rod piece can be additionally arranged to reduce the internal force of the strut structure and the deformation of the enclosure wall, so that the safety of the foundation pit is ensured. The interface size and the reinforcing bars of the support plate changing wall and the inclined support rod can be determined by calculation according to the design value of the inner horizontal support axial force required to be born.

On the premise of ensuring that each layer of support changing structure has enough stability, the local foundation pit inner support can be removed in advance, the region with higher progress requirement of the local construction period is constructed, the rapid construction of the basement in the specific region is completed, the key nodes of the project are compressed, the construction period of the whole project is improved, and the purpose of saving financial cost is achieved.

To sum up, the utility model discloses mainly provide a neotype foundation ditch to the big deep foundation ditch of multichannel support system and return the road line of building, seek new breakthrough and feasibility in the operating mode of building back of traditional simplification. On the premise of not dividing pits and excavating, the support can be removed and built back in multiple stages in a specific area in advance, and a new support changing system which is stable and reliable for support systems of other remaining areas is ensured. The multi-support system is integrally supported to a partial structure constructed in advance by arranging a support replacing transition area with a certain scale, and a local core area is quickly built. During construction, the support-changing system is used for transferring the support-changing system to an underground main structure of a first building-back area, so that the rest horizontal support structure which is not disassembled can still support the enclosure structure. The underground main structure of the first building area can be used as a support structure of the enclosure structure on the other side. The water and soil pressure on the two sides is always kept balanced through the support plate wall and the inclined support rod pieces. The foundation pit can finish quick construction of a specific area in advance on the premise of not digging pits, key nodes of projects are compressed, and the aim of saving financial cost is finally achieved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (4)

1. A support replacing structure in a deep and large foundation pit partition cross-stage reclamation is characterized in that a bottom plate structure (13) and an inner horizontal support structure are sequentially arranged in a foundation pit support structure (1) from bottom to top; the method is characterized in that: the support changing transition structure is arranged between a first building area in the foundation pit and a second building area in the foundation pit, and comprises an inclined support changing structure and a support changing plate wall fixed on the bottom plate structure (13); the support plate replacing walls are double walls which are oppositely arranged and comprise a left support plate replacing wall and a right support plate replacing wall; the inner horizontal supporting structure is broken by the support plate changing wall, and the inner horizontal supporting structure of the rear building area in the foundation pit is fixedly connected with the left support plate changing wall; the inclined support replacing structure is arranged in a first building area in the foundation pit and is connected with the right support replacing plate wall and the bottom plate structure (13).

2. The support replacing structure in the deep and large foundation pit partition cross-stage reclamation according to claim 1, characterized in that: the inclined strut replacing structure comprises an inclined strut.

3. The support replacing structure in the deep and large foundation pit partition cross-stage reclamation according to claim 2, characterized in that: the inclined support changing structure further comprises a support changing upright post, and the support changing upright post is fixed on the bottom plate structure (13); the inclined strut and the strut-changing upright column jointly form a force transmission structure, and the right strut-changing wall and the bottom plate structure (13) are connected.

4. The support replacing structure in the deep and large foundation pit partition cross-stage reclamation according to claim 1, characterized in that: and the support plate replacing wall and the inclined support replacing structure are provided with a stress and deformation monitoring device.

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