阅读说明：本技术 一种既有建筑地下空间竖向拓建施工方法 (Vertical construction method for underground space of existing building ) 是由 沈雯 陈峰军 陈裕刚 程子聪 沈蓉 于 2019-09-12 设计创作，主要内容包括：本发明涉及地下空间施工领域,本发明公开了一种既有建筑地下空间竖向拓建施工方法,通过对既有地下结构加固,通过MJS工法即全方位高压喷射法对既有建筑周边土体进行加固处理,在土体加固区域周边进行导墙施工,在导墙的基础上进行地下连续墙施工,进行桩基施工,利用取土口向下进行暗挖法挖土施工,施工第一道混凝土支撑,由上至下,依次施工其余混凝土支撑,施工大底板,在大底板强度达到标准要求后,由下至上逐层拆除对应层混凝土支撑并施工对应层的混凝土楼板,从而可以在对周边环境影响小且在尽量不影响既有建筑使用功能下,在既有地下结构下拓深建筑深度,提高城市空间利用率,并且,本发明的既有地下结构能够继续使用,拓建造价低,绿色环保。(The invention relates to the field of underground space construction, and discloses a vertical construction method for an existing building underground space, which comprises the steps of reinforcing an existing underground structure, reinforcing soil around the existing building by an MJS construction method, namely an omnibearing high-pressure injection method, conducting guide wall construction around a soil reinforcing area, conducting underground continuous wall construction on the basis of a guide wall, conducting pile foundation construction, conducting underground excavation construction downwards by using an earth taking port, constructing a first concrete support, sequentially constructing other concrete supports from top to bottom, constructing a large bottom plate, dismantling the corresponding layer of concrete support from bottom to top and constructing the concrete floor slab of the corresponding layer after the strength of the large bottom plate reaches a standard requirement, thereby being capable of expanding the deep building depth under the existing underground structure with little influence on the surrounding environment and without influencing the use function of the existing building as much as possible, the urban space utilization rate is improved, the existing underground structure can be continuously used, the construction cost is low, and the urban underground structure is green and environment-friendly.)

1. A vertical building construction method of an existing building underground space is used for vertically building an existing underground structure of an existing building, and is characterized by comprising the following steps:

step one, reinforcing an existing underground structure: reinforcing the interior of the existing underground structure by adopting diagonal braces;

step two, soil body reinforcement: reinforcing the soil around the existing building, wherein the width of a soil reinforcing area is 50-100cm, and the depth of the soil reinforcing area is greater than that of the existing underground structure;

step three, guide wall construction: conducting guide wall construction on the periphery of the soil body reinforcing area;

step four, constructing the underground continuous wall: carrying out underground continuous wall construction on the basis of the guide wall;

step five, pile foundation construction: carrying out pile foundation construction, wherein the depth of the pile foundation is greater than that of the underground continuous wall;

step six, excavating and first concrete supporting construction: carrying out underground excavation construction downwards by using an earth taking port, and constructing a first concrete support, wherein the earth taking port is correspondingly arranged on a bottom plate and a top plate of an existing underground structure and each floor between the bottom plate and the top plate from top to bottom;

seventhly, digging and supporting the rest of concrete: carrying out excavation construction by a subsurface excavation method continuously downwards by using the soil taking port, and constructing other concrete supports from top to bottom in sequence;

eighthly, digging soil and constructing a large bottom plate: the excavation construction is continuously carried out downwards by utilizing the soil taking port, and a large bottom plate is constructed;

step nine, building an underground structure: and after the strength of the large bottom plate reaches the standard requirement, removing the concrete supports of the corresponding layer from bottom to top layer by layer and constructing the concrete floor slabs of the corresponding layer, thereby realizing the vertical building of the existing underground structure of the existing building.

2. The vertical construction method of building underground space of the existing building according to claim 1, wherein in the second step, the reinforcement processing is performed to the soil around the existing building through MJS construction method.

3. The vertical construction method of the underground space of the existing building according to claim 1, wherein the depth of the underground continuous wall is 2-2.2 times of the construction depth.

4. The vertical construction method of the underground space of the existing building according to claim 1, wherein the soil sampling port is sealed after the large bottom plate is constructed.

Technical Field

The invention relates to the field of underground space construction, in particular to a vertical building construction method for an underground space of an existing building.

Background

With the rapid development of national economy for many years, the urbanization process is deepened continuously, the scale of infrastructure construction of each region is larger and larger, and under the background of large-scale construction, available land resources in cities are limited, particularly existing buildings in downtown areas of the cities are erected, underground structures are complex, and the development and construction of large underground spaces are greatly restricted. For example, with the increasing population of cities in various centers, ground buildings have been far from meeting the daily demands of residents, and commercial civil and municipal facilities such as malls and subway stations are gradually developed to the deep underground. However, due to factors such as estimated pedestrian flow and capital cost, the space of the building under the initial construction time is often not considered for subsequent use, and the space design is too small to meet the use requirements after many years.

The common solution ideas mainly include two, one is to perform demolition and reconstruction, and the other is to perform horizontal demolition and reconstruction. The demolition and reconstruction cost is high, the construction period is long, and the original use function is lost in the reconstruction stage. However, whether the horizontal building is carried out by open excavation or underground excavation, the treatment of the connecting parts of the existing structure and the building structure is a technical difficulty, and the construction risk is high. Therefore, the invention provides a method and a structure for vertically building underground space, which improve the use efficiency of soil by increasing the built underground space layers.

In addition, traditional underground space construction adopts the method of demolishing the rebuilding, mainly adopts the open cut method to carry out the construction, though the open cut method has the construction simply, the direct low cost of engineering, advantages such as the controllable degree of work progress height, nevertheless also has apparent not enoughly:

(1) the influence on the existing buildings is great. Existing buildings in the engineering range have to adopt disposal methods such as permanent relocation, temporary displacement and the like, so that the indirect engineering cost and the auxiliary construction period are greatly increased;

(2) the influence on the normal operation of the city is great. Existing buildings such as traffic roads, drainage pipe networks, water, electricity and coal networks and the like in the engineering influence range cannot be interfered with, and the normal operation of cities is seriously influenced;

(3) the influence on the environment of the city appearance is great. The whole construction process is in a relatively open environment, and the influence of mud, dust, noise and vibration pollution on the city appearance environment is great.

Therefore, from the perspective of intensification and sustainable development, the urban development mode is changed into three-dimensional deep development, the underground space is fully utilized, and the method becomes an effective way for solving the urban land shortage. The method improves the construction level of underground space in China, and has important significance for constructing a conservation-oriented society and intensively utilizing precious land resources.

Disclosure of Invention

The invention aims to provide a vertical building construction method for an underground space of an existing building, which can be used for vertically building an underground structure under the condition that the using functions of the existing overground structure and the existing underground structure are not influenced as much as possible, so that the underground structure space is increased under the condition of minimum environmental influence, and the increasing using requirements of residents are met.

In order to solve the technical problems, the invention provides the following technical scheme:

a vertical building construction method of an existing building underground space is used for vertically building an existing underground structure of an existing building, and comprises the following steps:

step one, reinforcing an existing underground structure: reinforcing the interior of the existing underground structure by adopting diagonal braces;

step two, soil body reinforcement: reinforcing the soil around the existing building, wherein the width of a soil reinforcing area is 50-100cm, and the depth of the soil reinforcing area is greater than that of the existing underground structure;

step three, guide wall construction: conducting guide wall construction on the periphery of the soil body reinforcing area;

step four, constructing the underground continuous wall: carrying out underground continuous wall construction on the basis of the guide wall;

step five, pile foundation construction: carrying out pile foundation construction, wherein the depth of the pile foundation is greater than that of the underground continuous wall;

step six, excavating and first concrete supporting construction: carrying out underground excavation construction downwards by using an earth taking port, and constructing a first concrete support, wherein the earth taking port is correspondingly arranged on a bottom plate and a top plate of an existing underground structure and each floor between the bottom plate and the top plate from top to bottom;

seventhly, digging and supporting the rest of concrete: carrying out excavation construction by a subsurface excavation method continuously downwards by using the soil taking port, and constructing other concrete supports from top to bottom in sequence;

eighthly, digging soil and constructing a large bottom plate: the excavation construction is continuously carried out downwards by utilizing the soil taking port, and a large bottom plate is constructed;

step nine, building an underground structure: and after the strength of the large bottom plate reaches the standard requirement, removing the concrete supports of the corresponding layer from bottom to top layer by layer and constructing the concrete floor slabs of the corresponding layer, thereby realizing the vertical building of the existing underground structure of the existing building.

Preferably, in the above construction method for vertical building of an underground space of an existing building, in the fourth step, the construction of the underground continuous wall includes placing a reinforcement cage and pouring concrete.

Preferably, in the above vertical construction method for building an underground space of an existing building, the depth of the underground continuous wall is 2 to 2.2 times of the building depth.

Preferably, in the above construction method for vertical building of an underground space of an existing building, the soil-taking opening is sealed after the construction of the large bottom plate is completed.

Preferably, in the above-mentioned construction method for vertical building of an underground space of an existing building, in the second step, a soil body around the existing building is reinforced by the MJS construction method.

According to the technical scheme disclosed above, compared with the prior art, the invention has the following beneficial effects:

the invention provides a vertical building construction method of underground space of existing building, which comprises the steps of reinforcing the existing underground structure, reinforcing the soil body around the existing building by an MJS construction method, namely an all-round high-pressure injection method, conducting guide wall construction on the periphery of a soil body reinforcing area, conducting underground continuous wall construction on the basis of the guide wall, conducting pile foundation construction, conducting underground excavation construction downwards by using an earth taking port, constructing a first concrete support, conducting underground excavation construction downwards by using the earth taking port, sequentially constructing other concrete supports from top to bottom, conducting underground excavation construction downwards by using the earth taking port, constructing a large bottom plate, removing the corresponding layer of concrete support layer by layer from bottom to top after the strength of the large bottom plate reaches the standard requirement, constructing the concrete floor slab of the corresponding layer, and thus, the method has little influence on the surrounding environment and has no influence on the use function of the existing building as much as possible, the building depth is deepened under the existing underground structure, the urban space utilization rate is improved, and the increasing use requirements of residents are met. In addition, the existing underground structure can be continuously used, the construction cost is low, and the underground structure is green and environment-friendly.

Drawings

Fig. 1 is a first step structural schematic diagram of a vertical topological construction method for an underground space of an existing building according to an embodiment of the present invention.

Fig. 2 is a structural schematic diagram of a second step of the existing building underground space vertical building construction method according to the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a third step of the existing building underground space vertical building construction method according to an embodiment of the present invention.

Fig. 4 is a structural schematic diagram of a vertical building construction method of an existing building underground space according to an embodiment of the present invention in step four.

Fig. 5 is a schematic structural diagram of a fifth step of the vertical construction method for building an underground space of an existing building according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a sixth step of the existing building underground space vertical building construction method according to the embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a seventh step of the vertical construction method for building an underground space of an existing building according to the embodiment of the present invention.

Fig. 8 is a structural schematic diagram of an existing building underground space vertical building construction method in step eight according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a ninth step of the vertical construction method for building an underground space of an existing building according to an embodiment of the present invention.

In the figure: 1-existing underground structure, 2-soil body reinforcement area, 3-guide wall, 4-underground continuous wall, 5-pile foundation, 6-concrete support, 7-large bottom plate, 8-concrete floor, 9-soil taking opening and 10-existing ground structure.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. The technical contents and features of the present invention will be described in detail below with reference to the embodiments illustrated in the accompanying drawings. It is further noted that the drawings are in greatly simplified form and are not to precise scale, merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.

Referring to fig. 1 to 9, the present embodiment discloses a vertical building construction method for an existing underground space of an existing building, which is used for vertically building an existing underground structure 1 of the existing building, and includes:

step one, reinforcing an existing underground structure 1: the inside of the existing underground structure 1 is reinforced by diagonal braces.

Step two, soil body reinforcement: the method comprises the following steps of reinforcing soil around the existing building, wherein the width of a soil reinforcing area 2 is 50-100cm, and the depth of the soil reinforcing area 2 is larger than that of the existing underground structure 1, so that disturbance of subsequent construction on the existing building (the existing building comprises the existing overground structure 10 and the existing underground structure 1) and influence on the surrounding environment are reduced.

Step three, constructing a guide wall 3: and (3) conducting construction on the guide wall 3 at the periphery of the soil body reinforcing area 2 so as to lay a foundation for the construction of the underground continuous wall 4.

Step four, constructing the underground continuous wall 4: the underground continuous wall 4, namely new enclosure construction, is carried out on the basis of the guide wall 3, and through the arrangement of the underground continuous wall 4, on one hand, the existing buildings (including the existing overground structure 10 and the existing underground structure 1) can be protected, and on the other hand, the influence of underground structure building construction on the surrounding environment can be reduced.

Step five, pile foundation 5 construction: constructing a pile foundation 5, wherein the depth of the pile foundation 5 is greater than that of the underground continuous wall 4;

step six, excavating and constructing a first concrete support 6: the excavation construction is carried out downwards by utilizing the soil taking port 9, a first concrete support 6 is constructed, and the soil taking port 9 is correspondingly arranged on a bottom plate, a top plate and floors between the bottom plate and the top plate of the existing underground structure 1 from top to bottom.

Seventhly, digging and constructing other concrete supports 6: and (4) continuing to carry out excavation construction downwards by using the soil taking port 9, and constructing the rest concrete supports 6 from top to bottom in sequence.

Eighthly, excavating soil and constructing a large bottom plate 7: and (4) continuing to carry out excavation construction downwards by using the soil taking port 9 by a subsurface excavation method, and constructing the large bottom plate 7, namely a new bottom plate.

Step nine, building an underground structure: after the strength of the large bottom plate 7 meets the standard requirement, the concrete supports 6 of the corresponding layer are dismantled from bottom to top layer by layer and the concrete floor slabs 8 of the corresponding layer are constructed, so that the vertical building of the existing underground structure 1 of the existing building is realized.

The invention provides a vertical construction method for underground space of an existing building, which comprises the steps of reinforcing an existing underground structure 1, reinforcing soil around the existing building by an MJS construction method, namely an omnibearing high-pressure injection method, constructing a guide wall 3 around a soil reinforcing area 2, constructing an underground continuous wall 4 on the basis of the guide wall 3, constructing a pile foundation 5, carrying out underground excavation construction downwards by using a soil taking port 9, constructing a first concrete support 6, carrying out underground excavation construction downwards by using the soil taking port 9, sequentially constructing the rest concrete supports 6 from top to bottom, carrying out underground excavation construction downwards by using the soil taking port 9, constructing a large bottom plate 7, dismantling the corresponding layer of concrete supports 6 from bottom to top and constructing the corresponding layer of concrete floor 8 after the strength of the large bottom plate 7 meets the standard requirement, thus having little influence on the surrounding environment and having no influence on the use function of the existing building to the greatest extent, the building depth is deepened under the existing underground structure 1, the urban space utilization rate is improved, and the increasing use requirements of residents are met. In addition, the existing underground structure 1 can be continuously used, the construction cost is low, and the environment is protected.

Preferably, in the above construction method for vertical building of the underground space of the existing building, in the fourth step, the underground continuous wall 4 is constructed, including placing a reinforcement cage and pouring concrete.

Preferably, in the above-mentioned construction method for vertically extending an underground space of an existing building, in the second step, a soil body around the existing building is reinforced by an MJS construction method, i.e., an omni-directional high-pressure injection method. The MJS construction method can measure and adjust the pressure of muddy water in the stratum, can carry out 360-degree all-dimensional construction, can freely select the reinforcing diameter and is simple and convenient to construct.

Preferably, in the above vertical construction method for building an underground space of an existing building, the depth of the underground continuous wall 4 is 2-2.2 times of the building depth, on one hand, to reduce the influence of the construction on the surrounding environment, and on the other hand, to prevent the influence of the underground confined water on the surrounding environment, thereby further improving the protection of the existing building and the surrounding environment.

Preferably, in the above-mentioned construction method for vertically building an underground space of an existing building, the soil-taking opening is sealed after the construction of the large bottom plate 7 is completed, so that the influence on the use function of the existing underground structure 1 can be avoided, and the original use function can be completely restored.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.