CN205636751U - Assembled forming structures system towards secret building of multilayer - Google Patents

Abstract

The utility model discloses a prefabricated stereotyped structure system for multi-storey underground buildings, including basement outer walls and basement floor slabs constituting the basement structure, including two rows of support piles for foundation pit support, and two rows of support piles with misplaced piles. , the supporting piles form a gradually rising stepped support from the row of supporting piles closest to the basement outer wall to the other row of supporting piles, between the outer wall of the basement and the row of supporting piles closest to the outer wall of the basement Outrigger supports are provided, and crown beams are arranged on the top of the support piles, and two rows of support piles are connected to each other through the crown beams. On the basis of the permanent support structure for the foundation pit of the utility model, the basement part adopts an assembled structure, the on-site construction is convenient and fast, the structural quality is easy to guarantee, the production efficiency can be effectively improved, and construction waste can be reduced to a large extent; the support can be realized The organic combination of the permanent structure and the assembly of the underground structure realizes the organic unity of the architectural structure design and the support structure design.

Description

Prefabricated stereotyped structure system for multi-storey underground buildings

technical field

The utility model relates to an underground engineering, in particular to an assembly-type stereotyped structure system for multi-storey underground buildings.

Background technique

In the field of building structures, prefabricated reinforced concrete structures have become one of the important directions for the development of building structures. Compared with cast-in-place concrete structures, prefabricated structures have the advantages of easy guarantee of structural quality, convenient and quick on-site assembly, and can effectively improve production efficiency. The reduction of construction waste to a certain extent has good economic and environmental benefits.

In foundation pit engineering, especially deep foundation pit engineering, the retaining wall support structure based on support piles is one of the common forms of deep foundation pit support. In traditional building structure design, the foundation pit support structure is usually regarded as temporary The permanent construction measures only play a role in the construction stage of the underground structure. After the foundation pit is backfilled, the ground will be abandoned. This will cause a great waste of building materials and social resources. However, if these piles can be further utilized, energy can be greatly saved. In addition, the construction of the existing basement is relatively complicated, and there are many procedures, so the foundation pit support system cannot be effectively used, and the area above the ground is small. It is greatly reduced and the underground space needs to be fully utilized. Therefore, it is necessary to conduct more in-depth research on the construction of basements that can improve construction speed and save energy.

Utility model content

In view of the above problems, in order to solve the shortcomings of the existing technology, a prefabricated stereotyped structure system for multi-storey underground buildings is specially set up, that is, the slope of the foundation pit adopts stepped support based on double rows of prefabricated piles, and the The support structure is combined with the main structure. On this basis, the assembly construction of the underground structure of the main building is realized. The permanent support structure and the assembly of the underground structure are combined to form a prefabricated permanent support structure system, which helps to promote Urban underground space is developing toward intensification and sustainability.

The prefabricated stereotyped structural system for multi-storey underground buildings, including the basement outer wall, basement floor and two rows of foundation pit support piles of the basement structure. The two rows of foundation pit support piles are misplaced, and the support piles are supported from the inside The support piles on the outer side are stepped support that gradually rises. There is an outstretched support between the basement wall and the support piles. The top of the support piles is provided with a crown beam. Connection; because the support piles of the foundation pit are connected with the outrigger supports to form a permanent underground support structure system with the basement structure, and the support piles are used as a part of the basement support, which not only realizes the utilization of the support piles, but also makes the basement support It is more firm; at the same time, the stepped support is set in consideration of the slope control effect.

When two rows of stepped support are used, the pile top elevation of the second row of supporting piles with a lower height is positioned at the basement floor elevation of the negative first floor, and the pile tops of the second row of supporting piles are connected by crown beams, and the second row of supporting piles The outside of the pile crown beam and the first row of supporting piles are poured into one body, and the front and rear rows of supporting piles are connected to each other through the crown beam of the second row of supporting piles.

In addition, the stepped support forms a composite support structure in which the upper part is supported by single-row piles and the lower part is supported by double-row piles. The row of piles provides a point to effectively reduce the bending moment of the front row of supporting piles, make full use of the rigidity of the lower half of the double-row pile support structure, reduce the horizontal displacement of the support structure, and increase the strength of the support structure. overall stability.

Further, in order to realize intensive production, the crown beam at the top of the outer support pile includes multiple splicing sections, and the end of each crown beam splicing section is provided with embedded parts for splicing adjacent crown beams, and the crown beam at the top of the inner support pile is Cast-in-place parts and embedded parts can be steel plates fixed on the side wall of the crown beam or the steel plate at the bottom of the crown beam. After the crown beam is spliced, the steel plate embedded parts are connected to the crown beam by bolts to realize fastening.

Further, the supporting piles are prefabricated concrete piles, which are prestressed pipe piles, prestressed square piles or prestressed sheet piles.

Furthermore, the basement exterior walls and basement floors are all made of prefabricated panels; because the basement exterior walls and basement floors are made of prefabricated panels, the entire structure will not reduce the service life of the basement, and greatly shorten the construction time of the basement.

Further, the crown beam at the top of the support pile at the low position is poured into one piece with the adjacent support pile body.

Furthermore, the crown beam on the top of the outer support piles is integrated with the concrete construction road outside the foundation pit, and the top of the first row of support piles is anchored by the weight of the construction road itself and the friction with the soil to reduce the pile load. top displacement.

Further, the outrigger support is a prefabricated plain concrete support, and the plain concrete support is located in the plane of the foundation floor. One end of the support is connected to the basement floor, and the other end is connected to the pile body of the support pile by pouring. It is also possible to set a waist beam on the pile body. The setting of beams and crown beams makes the force mainly supported by the basement floor evenly distributed to the supporting piles, and the setting of multiple rows of supporting piles effectively avoids the damage of the structure caused by stress concentration; the plain concrete support only bears Axial pressure, so it can be directly poured with plain concrete after the construction fertilizer tank is cleaned up, and the support can be made into a beam shape or a plate shape.

Further, the outrigger is a prefabricated reinforced concrete support, one end of the outrigger is connected to the basement floor, and one end is connected to the crown beam at the top of the inner support pile or the pile body of the support pile through a steel plate or a pre-embedded steel bar; All in all, the crown beam at the top of the outer support pile is a reinforced concrete prefabricated crown beam, and a reinforced concrete cast-in-place crown beam can also be used; the top crown beam of the inner support pile is a reinforced concrete cast-in-place crown beam, which can also be spliced with reinforced concrete prefabricated piles first. , and then connected with the outer support piles by pouring concrete on the outer side.

Further, the crown beam is provided with a through hole for the passage of the support piles, so as to better connect the prefabricated support piles and the crown beam as a whole.

Further, it also includes a positioning mold for positioning the support pile during the construction of the support pile, which is welded and formed by H-shaped steel.

In the utility model, the permanent support structure combines the support structure of the foundation pit with the main structure of the underground building, and transforms the support structure into a part of the main structure to play a permanent role, which can fully exert the rigidity of the support structure itself and effectively reduce the size of the basement. The thickness of the outer wall, on the one hand, can effectively reduce the project cost, on the other hand, it also makes it possible to assemble the basement structure, which helps to promote the development of urban underground space construction towards intensification.

In addition, waterproof treatment shall be carried out on the splicing parts of the various components on the top of the foundation pit, such as the contact gap between adjacent crown beams shall be smoothed and water-stopped with mortar.

The construction method of the structural system, the specific construction steps are as follows:

Step 1): Construct the first row of support piles along the outer edge of the foundation pit, and construct the pile crown beam and the construction road outside the foundation pit to form the first-order support;

Step 2): Construct the second row of supporting piles along the inner side of the edge of the foundation pit, the second row of supporting piles and the first row of supporting piles are dislocated, and the pile top elevation of the second row of supporting piles is lower than that of the first row of supporting piles The piles are at the same height as the floor slab of the basement on the first floor;

Step 3): Excavate the foundation pit for the first time, and excavate to the position of the pole top of the second row of supporting piles;

Step 4): constructing the cast-in-place crown beam 3 on the pile top of the second row of piles to form a second-order support;

Step 5): Excavate the foundation pit for the second time, and excavate to the design elevation of the pit bottom, and do not excavate the soil between the two rows of piles;

Step 6): constructing the main building foundation structure, pouring the bottom floor of the basement, and pouring plain concrete supports 10 between the basement floor 7 and the second row of support piles;

Step 7): Carry out the prefabrication and installation of the outdoor wall panels of the basement on the second negative floor;

Step 8): Carry out prefabrication and installation of the basement floor slab and basement outdoor wall panels and pouring of basement beam and column components, and install prefabrication between the basement floor slab of the negative first floor and the crown beams of the second row of supporting piles support;

Step 9): apply the waterproof and thermal insulation layer of the basement exterior wall;

Step 10): The soil is backfilled and compacted in layers.

The beneficial effects of the utility model are:

(1) In the utility model, the foundation pit adopts stepped support and graded excavation based on double-row prefabricated piles, which has the characteristics of high degree of building industrialization, convenient and fast on-site construction, and good slope deformation control effect.

(2) In the utility model, the foundation pit adopts a permanent support structure based on double-row prefabricated pile graded support. By combining the support structure of the foundation pit with the main structure of the underground building, the support structure is transformed into a part of the main structure Playing a permanent role can give full play to the rigidity of the support structure itself and effectively reduce the thickness of the basement exterior wall. On the one hand, it can effectively reduce the project cost. On the other hand, it also makes the assembly construction of the basement structure possible, which helps to promote the construction of urban underground space. Let go of development towards intensification.

(3) In this utility model, on the basis of the permanent support structure for the foundation pit, the basement part adopts an assembled structure. Compared with the cast-in-place concrete structure, the on-site construction is convenient and fast, and the structural quality is easy to ensure, which can effectively improve production. Efficiency, reduce construction waste to a greater extent, and have good economic and environmental benefits.

(4) The system in the utility model can realize the organic combination of the permanent support structure and the assembly of the underground structure, realize the organic unity of the architectural structure design and the support structure design, and can effectively promote the industrialization of construction in my country and the urban underground space Towards intensification and sustainable development.

Description of drawings

Fig. 1 is the schematic diagram of the utility model based on two-layer basement structure.

Fig. 2 is a schematic horizontal cross-sectional view of the utility model at the position of the crown and beam of the first row of supporting piles.

Fig. 3 is a schematic horizontal cross-sectional view of the utility model at the position of the crown and beam of the second row of supporting piles.

Fig. 4 is a side view of the assembly position of the first row of support piles and the crown beam in the utility model.

Fig. 5 is a horizontal sectional view of the first row of support piles and crown beam assembly position in the utility model.

Fig. 6 is a schematic diagram of the supporting pile positioning mold of the present invention.

Fig. 7 is a schematic diagram of the utility model based on a three-story basement structure.

The meaning of each label in the figure: 1-support pile, 2-prefabricated crown beam, 3-cast-in-place crown beam, 4-concrete construction road outside the foundation pit, 5-basement exterior wall, 6-basement floor, 7-basement floor, 8-Basement external wall beams, 9-Prefabricated support, 10-Plain concrete support, 11-Embedded parts, 12-Protective pole installation holes, 13-Protrusion, 14-Protective railing, 15-Support pile positioning mold.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments of the description:

Example 1

As shown in Figure 1, the underground structure of this project example is a two-story basement. The underground structure consists of prefabricated basement exterior wall 5, basement floor slab 6, basement floor slab 7, basement exterior wall beam 8 and other main components.

As shown in Figure 1, the foundation pit support structure of this engineering example is a double-row prestressed pipe pile ladder-type support structure, which mainly includes support piles 1, prefabricated crown beams 2, and cast-in-place crown beams 3 and other main components.

As shown in Figure 1, the first row of support piles in this project example are prestressed pipe piles, and the prefabricated crown beam 2 on the top of the piles is connected to the concrete construction road 4 outside the foundation pit. Anchor the top of the first row of supporting piles to reduce the displacement of the pile top, and the width of the construction road meets the specification requirements.

As shown in Fig. 2, Fig. 4 and Fig. 5, the supporting piles in adjacent rows are connected to each other through crown beams. 13 and grooves, and equipped with steel plate embedded parts 11, as shown in Figure 4 and Figure 5, the adjacent prefabricated crown beams 2 are spliced through the raised 13 grooves, and bolted through the steel plate embedded parts 11 The top of the crown beam is reserved with a protective bar installation hole 12, and the installation of the protective railing 14 can be carried out through the installation hole.

As shown in Figure 1, the second row of supporting piles in this project example is prestressed pipe piles, and the elevation of the crown beam at the top of the piles is the elevation of the first foundation pit excavation depth, which is approximately equal to the elevation of the basement floor of the negative first floor. Two outriggers are set between the support piles and the basement exterior wall 5. The outriggers of the main structure are reinforced concrete cast-in-place supports. The cast-in-place crown beam 3 is connected, and the other end is connected to the basement external wall beam 8 through steel bars or steel plate embedded parts, and then connected to the basement floor 6. The outstretched support of the foundation floor is plain concrete support, and the plain concrete support is located In the plane, one end of the support is poured and connected with the basement floor 7, and the other end is connected with the support pile 1 pile body by pouring.

As shown in Figure 1, the main building in this project example includes two basements. The basement exterior wall 5 and the basement floor 6 are prefabricated components.

As shown in Figure 3, in this project example, the two rows of supporting piles in the front and rear are dislocated. The crown beams of row-supported piles are connected to each other.

As shown in Figure 1, after the construction of the underground structure is completed, the soil between the basement exterior wall and the support piles is backfilled, and the backfilled soil should be compacted in layers.

The construction method of the structural system, the specific construction steps are as follows:

Step 1): Construct the first row of support piles along the outer edge of the foundation pit, and construct the prefabricated crown beam 2 on the pile top and the construction road 4 outside the foundation pit to form the first-order support;

Step 2): Construct the second row of supporting piles along the inner side of the edge of the foundation pit, the second row of supporting piles and the first row of supporting piles are dislocated; piles and are on the same level as the height of the basement floor 6 on the first floor;

Step 3): Excavate the foundation pit for the first time, and excavate to the position of the pole top of the second row of supporting piles;

Step 4): constructing the cast-in-place crown beam 3 on the top of the second row of supporting piles to form the second-order support;

Step 5): Excavate the foundation pit for the second time, and excavate to the design elevation of the pit bottom, and do not excavate the soil between the two rows of piles;

Step 6): pouring the basement floor 7, pouring plain concrete support 10 between the basement floor 7 and the second row of support piles;

Step 7): constructing the main structure of the basement, including the prefabrication and installation of the basement exterior wall 5 and the basement floor 6, and the pouring of the basement beam and column components; installing the prefabricated support 9 between the basement floor 6 and the second row of support piles;

Step 8): Carry out the construction of the upper basement structure in sequence, including the prefabrication and installation of the basement exterior wall 5 and the basement floor 6, the pouring of the basement beams, columns and support members, until the construction of the main structure of the underground part is completed;

Step 9): apply a waterproof insulation layer for the basement exterior wall 5;

Step 10): The foundation pit soil is backfilled and compacted in layers.

During the construction process of the support pile 1, according to the size of the support pile 1 and the position of the pile, the construction positioning mold of the support pile 1 is customized in advance, the pile hole is accurately positioned through the mold, and the verticality of the support pile 1 is guaranteed by using existing engineering measures , to ensure the construction accuracy of the support pile 1.

The positioning mold is tailored according to the specific project. As shown in Figure 6, it is formed by welding H-shaped steel and can be reused. Due to the limitation of the length of the mold, the construction sequence is to first fix the mold according to the requirements, and construct the support within the range where the mold is located. For pile 1, after the construction is completed, the mold is disassembled and moved to the next construction position to be fixed again, and the next set of support piles 1 is constructed in sequence at the new fixed position of the mold, and the construction is advanced in sequence according to the construction sequence of the support piles. Recycle the mould.

Example 2

The difference between this embodiment and embodiment 1 is:

The outrigger support is a prefabricated reinforced concrete support. One end of the outrigger support is connected to the waist beam provided on the support pile through the embedded part, and the other end is connected to the beam of the outer wall of the basement through the embedded part to realize the connection with the basement floor. The setting of the waist beam and crown beam makes the force mainly supported by the basement floor evenly distributed to the support piles, and the arrangement of multiple rows of support piles effectively avoids the damage of the structure caused by stress concentration.

Example 3

As shown in Figure 7, the underground structure of this engineering example is a three-story basement, and its specific structure and construction procedures are similar to those in Example 1. Both the exterior wall 5 and the basement floor slab 6 are prefabricated panels, and the basement beam and column components are all cast-in-place concrete components.

As shown in Figure 3, compared with Embodiment 1, the difference of Embodiment 3 is that its underground structure is a three-story basement, and there are three supports between the supporting structure and the outer wall of the basement. The panels are flat, the outrigger support at the bottom is still plain concrete support 10, and the outrigger supports on the upper two floors are all prefabricated supports 9.

The above is only a preferred embodiment of the utility model, not all embodiments of the utility model, and is not intended to limit the utility model. Any modifications made within the spirit and principles of the utility model are equivalent to Replacement, improvement, etc. should all be included in the protection scope of the present utility model.

Except for the technical features described in the specification, the rest of the technical features are technologies known to those skilled in the art. In order to highlight the innovative features of the utility model, the above technical features will not be repeated here.

Claims (10)

1. The prefabricated stereotyped structural system for multi-storey underground buildings is characterized in that it includes the basement outer wall of the basement structure, the basement floor and two rows of foundation pit support piles, and the two rows of foundation pit support piles are misplaced. The piles form a gradually rising stepped support from the inner support pile to the outer support pile. There is an outstretched support between the outer wall of the basement and the support pile. The top of the support pile is provided with a crown beam. The protective piles are connected to each other through crown beams; adjacent rows of support piles are connected to each other through crown beams, and the top crown beams of the first row of support piles on the outer side are prefabricated components, and the two ends of each prefabricated section are respectively provided with protrusions and grooves , adjacent prefabricated crown beams are spliced through raised grooves. 2. The structural system as claimed in claim 1, characterized in that the crown beam at the top of the outer support pile comprises a multi-section splicing section, and the end of each crown beam splicing section is provided with an embedded part convenient for splicing adjacent crown beams, and the inner side The crown beam at the top of the support pile is cast-in-place. 3. The structural system according to claim 1, wherein the supporting piles are prefabricated concrete piles, which are prestressed pipe piles, prestressed square piles or prestressed sheet piles. 4. The structural system according to claim 1, characterized in that, both the exterior wall of the basement and the floor slab of the basement are prefabricated panels. 5. The structural system according to claim 1, characterized in that the crown beam at the top of the support pile at the low position is poured integrally with the adjacent support pile body. 6. The structural system according to claim 1, characterized in that the crown beam at the top of the outer support pile is integrated with the concrete construction road outside the foundation pit. 7. The structural system according to claim 1, wherein the outrigger support is a prefabricated plain concrete support, the plain concrete support is located in the plane of the foundation floor, one end of the support is connected to the basement floor, and the other end is connected to the supporting pile body Pour connections. 8. The structural system according to claim 1, wherein the outrigger is a prefabricated reinforced concrete support, one end of the outrigger is connected to the basement floor, and the other end is connected to the top of the inner support pile through a steel plate or pre-embedded steel bar The crown beam or the pile body connection of the support pile. 9. The structural system according to claim 1, wherein the crown beam is provided with a hole for fixing and supporting the pile top of the retaining pile. 10. The structural system according to claim 1, further comprising a positioning mold for positioning the support piles during construction of the support piles.