阅读说明：本技术 自沉式深基坑挡墙结构和地下空间结构的施工方法 (Construction method of self-sinking type deep foundation pit retaining wall structure and underground space structure ) 是由 刘献刚 付豫楹 胡子文 刘若辉 于 2020-06-02 设计创作，主要内容包括：本发明提供了一种自沉式深基坑挡墙结构,包括：筒型挡墙本体,其中,所述筒型挡墙本体的底部成型有破土结构,所述破土结构与所述筒型挡墙本体的重力配合实现向下破土；还包括设置上所述筒型挡墙本体的外侧壁上的增阻装置,用于与地基配合,调节所述地基对所述筒型挡墙本体向上的阻力。通过在所述筒型挡墙本体的底部成型所述破土结构可以无需进行锤击操作,即可实现自沉,使得施工工序较少,产生施工噪声较小,工期较短,对周边环境带来的污染较小；设置增阻装置,用于调节所述地基对所述筒型挡墙本体向上的阻力,从而可以根据不同的土体条件来控制自沉式深基坑挡墙结构下沉的速度和/或垂直度。本发明还提供了一种地下空间的施工方法。(The invention provides a self-sinking deep foundation pit retaining wall structure, which comprises: the cylindrical retaining wall comprises a cylindrical retaining wall body, wherein a soil breaking structure is formed at the bottom of the cylindrical retaining wall body, and the soil breaking structure is matched with the gravity of the cylindrical retaining wall body to break soil downwards; the resistance increasing device is arranged on the outer side wall of the cylindrical retaining wall body and used for being matched with a foundation to adjust the upward resistance of the cylindrical retaining wall body. The soil breaking structure is formed at the bottom of the cylindrical retaining wall body, so that self-sinking can be realized without hammering operation, the construction procedures are fewer, the construction noise is less, the construction period is shorter, and the pollution to the surrounding environment is less; and the resistance increasing device is used for adjusting the upward resistance of the cylindrical retaining wall body to the foundation, so that the sinking speed and/or the verticality of the self-sinking deep foundation pit retaining wall structure can be controlled according to different soil body conditions. The invention also provides a construction method of the underground space.)

1. The utility model provides a deep basal pit retaining wall structure of formula of sinking certainly, includes:

a cylindrical retaining wall body is arranged on the retaining wall,

it is characterized in that the preparation method is characterized in that,

A soil breaking structure is formed at the bottom of the cylindrical retaining wall body, and the cylindrical retaining wall body is suitable for realizing downward soil breaking and sinking through the gravity cooperation of the soil breaking structure and the cylindrical retaining wall body;

still including setting up resistance-increasing device on the lateral wall of barrel-type barricade body, resistance-increasing device is used for cooperating with the ground, adjusts the ground is right the ascending resistance of barrel-type barricade body.

2. The self-sinking deep foundation pit retaining wall structure according to claim 1, wherein: the resistance increasing device comprises:

the mounting structure is arranged on the outer side wall of the cylindrical retaining wall body;

a resistance increasing member; and

and the adjusting mechanism is respectively connected with the mounting structure and the resistance increasing component and used for adjusting the relative position of the resistance increasing component and the mounting structure so as to adjust the resistance of the cylindrical retaining wall body upwards exerted on the foundation through the resistance increasing component.

3. The self-sinking deep foundation pit retaining wall structure according to claim 2, wherein:

the adjusting mechanism is an oil cylinder mechanism or a thread screwing mechanism, one end of the oil cylinder mechanism or the thread screwing mechanism is detachably connected to the mounting structure, and the other end of the oil cylinder mechanism or the thread screwing mechanism is connected with the resistance increasing component.

4. The self-sinking deep foundation pit retaining wall structure according to claim 3, wherein the position of the resistance-increasing member in the vertical direction is lower than the position of the mounting structure.

5. The self-sinking deep foundation pit retaining wall structure according to claim 3, wherein the position of the resistance-increasing member is flush with the position of the mounting structure in the vertical direction.

6. The self-sinking deep foundation pit retaining wall structure according to claim 4 or 5,

the resistance increasing devices are circumferentially and symmetrically distributed.

7. The self-sinking deep foundation pit retaining wall structure according to claim 6,

and the outer side surface of the cylindrical retaining wall body is provided with a reference marker for judging the sinking speed and/or the verticality of the cylindrical retaining wall body.

8. The self-sinking deep foundation pit retaining wall structure according to claim 7,

the resistance increasing component is a top pressure plate.

9. A construction method of an underground space comprises the following steps:

a. shallow base treatment;

b. installing a first die body;

it is characterized by also comprising:

c. installing reinforcing steel bars in the first die body, and pouring and tamping concrete in the first die body to obtain a first barrel; the bottom of the first cylinder is provided with a ground breaking structure;

d. Arranging a resistance increasing device on the outer side wall of the first cylinder, wherein the resistance increasing device is suitable for being matched with a foundation to adjust the upward resistance of the foundation to the first cylinder;

e. digging a soil conveying body outwards from the inside of the first cylinder body, so that the soil breaking structure is matched with the gravity of the first cylinder body to break soil downwards, and the first cylinder body sinks under the action of the self gravity; and simultaneously, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the first cylinder, and the upward resistance of the foundation to the first cylinder is adjusted, so that the first cylinder reaches the target sinking speed and/or verticality.

10. A method of constructing an underground space according to claim 9, further comprising the steps of:

f. after the first cylinder body sinks to a preset depth, a second die body is installed above the first cylinder body, reinforcing steel bars are installed in the second die body, and concrete is poured and tamped in the second die body to obtain a second cylinder body;

g. the resistance increasing device is arranged on the outer side wall of the second cylinder;

h. and excavating and transporting soil bodies outwards in the first cylinder and the second cylinder, so that the second cylinder sinks under the action of self gravity, and meanwhile, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the second cylinder, so that the resistance of the foundation to the upward direction of the second cylinder is adjusted, and the second cylinder reaches the target sinking speed and/or verticality.

Technical Field

The invention relates to a construction method of a self-sinking type deep foundation pit retaining wall structure and an underground space structure.

Background

The construction difficulty of underground buildings is too big, the cost is too high, especially relate to "excavation supporting" engineering volume proportion when soft soil foundation too big, often appear "supporting the cost" and than the condition that main body building cost is high. In addition, underground engineering construction is complicated, so that the process links are multiple, the connection difficulty is high, the required construction period is too long, the influence on the surrounding environment is too large, for example, noise, vibration, waste gas, slurry and the like can be generated, and the influence is larger particularly in dense population areas. In the prior art, when a deep foundation pit is supported, a retaining wall is mainly formed by adopting a piling mode, for example, Chinese patent document CN108708382A discloses a continuous retaining wall for the deep foundation pit, wherein a continuous meshing part is formed by mutually and continuously meshing at least one layer of pile bodies and is annularly arranged around the foundation pit; the waterproof part is longitudinally inserted at the occlusion part of at least two adjacent piles and used for preventing underground water from permeating from the outer side of the foundation pit to the inner side of the foundation pit of the continuous occlusion part; the water blocking component is channel steel or steel plate. Above structure, can pass through the part that blocks water prevents effectively that groundwater from the interlock department infiltration of two adjacent pile bodies is inside the foundation ditch to the stagnant water ability of deep basal pit continuous barricade has been improved. Chinese patent document CN209308039U discloses a deep foundation pit underground space structure, which is characterized by comprising: the foundation pit is cylindrical; the plurality of cement soil pile bodies are annularly arranged along the inner wall of the foundation pit and mutually meshed to form a closed retaining wall; a plurality of interior ring beam of propping follows the annular fixed setting of inner wall of barricade, follow the inside of foundation ditch is right to the soil body the barricade forms the support, wherein, interior ring beam's interval certainly foundation ditch top reduces to the bottom gradually. The two foundation pit retaining walls are two main retaining wall forms in the prior art and are obtained by adopting piling form construction.

Although the two retaining walls can be used for driving the pile body to the designed depth according to the construction requirements, the pile driving construction can cause the defects of more construction processes, higher construction noise, longer construction period, higher pollution to the surrounding environment and the like.

If a deep foundation pit retaining wall structure can be designed to sink from a soil body through self gravity, and a hammering process is avoided, the technical problem can be better solved; however, due to inconsistent soil conditions in the construction site, for example, different water contents of soil bodies at different depths, the frictional resistance encountered when the deep foundation pit retaining wall structure sinks to different depths is different, so that the sinking speed is influenced, for example, the sinking speed at a certain depth is too high; in addition, the frictional resistance of the soil body at different positions of the same horizontal depth is different, so that the verticality of the deep foundation pit retaining wall structure during sinking can be influenced, and the engineering quality is further influenced.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is how to provide a self-sinking deep foundation pit retaining wall structure and a construction method of an underground space, wherein the self-sinking deep foundation pit retaining wall structure has the advantages of fewer construction processes, less construction noise, shorter construction period and less pollution to the surrounding environment, and the sinking speed and the verticality can be adjusted according to the soil condition.

The invention provides a self-sinking deep foundation pit retaining wall structure, which comprises: the cylindrical retaining wall comprises a cylindrical retaining wall body, wherein a soil breaking structure is formed at the bottom of the cylindrical retaining wall body, and the cylindrical retaining wall body is matched with the cylindrical retaining wall body through the soil breaking structure by gravity to realize downward soil breaking and sinking; still including setting up resistance-increasing device on the lateral wall of barrel-type barricade body, resistance-increasing device is used for cooperating with the ground, adjusts the ground is right the ascending resistance of barrel-type barricade body.

In the above self-sinking deep foundation pit retaining wall structure, the resistance increasing device includes an installation structure, which is arranged on the outer side wall of the cylindrical retaining wall body; a resistance increasing member; and the adjusting mechanism is respectively connected with the mounting structure and the resistance increasing component and used for adjusting the relative position of the resistance increasing component and the mounting structure so as to adjust the resistance which is applied to the cylindrical retaining wall body upwards by the foundation through the resistance increasing component.

Foretell from formula of sinking deep basal pit retaining wall structure, wherein, adjustment mechanism is oil cylinder mechanism or screw precession mechanism, oil cylinder mechanism or screw precession mechanism one end can be dismantled and connect and be in mounting structure is last, the other end with increase and hinder the part and connect.

In the above self-sinking deep foundation pit retaining wall structure, the position of the resistance increasing component in the vertical direction is lower than that of the mounting structure.

The above-mentioned self-sinking deep foundation pit retaining wall structure, wherein, the position of resistance-increasing part is with the position of mounting structure flushes in the vertical direction.

In the above self-sinking deep foundation pit retaining wall structure, the resistance increasing devices are a plurality of resistance increasing devices which are symmetrically distributed in the circumferential direction.

The self-sinking deep foundation pit retaining wall structure is characterized in that a reference marker is arranged on the outer side surface of the cylindrical retaining wall body and used for judging the sinking speed and/or the verticality of the cylindrical retaining wall body.

In the above self-sinking deep foundation pit retaining wall structure, the resistance increasing component is a top pressure plate.

The invention also provides a construction method of the underground space, which comprises the following steps: a. shallow base treatment; b. installing a first die body; c. installing reinforcing steel bars in the first die body, and pouring and tamping concrete in the first die body to obtain a first barrel; a ground breaking structure is formed at the bottom of the first cylinder; further comprising the steps of: d. arranging a resistance increasing device on the outer side wall of the first cylinder, wherein the resistance increasing device is used for being matched with a foundation to adjust the upward resistance of the foundation to the first cylinder; e. digging a soil conveying body outwards from the inside of the first cylinder body, so that the soil breaking structure is matched with the gravity of the first cylinder body to break soil downwards, and the first cylinder body sinks under the action of the self gravity; and simultaneously, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the first cylinder, and the upward resistance of the foundation to the first cylinder is adjusted, so that the first cylinder reaches the target sinking speed and/or verticality.

The construction method of the underground space further comprises the following steps: f. after the first cylinder body sinks to a preset depth, a second die body is installed above the first cylinder body, reinforcing steel bars are installed in the second die body, and concrete is poured and tamped in the second die body to obtain a second cylinder body; g. the resistance increasing device is arranged on the outer side wall of the second cylinder; h. and excavating and transporting soil bodies outwards from the interiors of the first cylinder and the second cylinder, so that the second cylinder sinks under the action of self gravity, and meanwhile, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the second cylinder, so that the upward resistance of the foundation to the second cylinder is adjusted, and the second cylinder reaches the target sinking speed and/or verticality.

In the construction method of the underground space, the resistance increasing device includes an installation structure disposed on the outer side wall of the first cylinder; a resistance increasing member; and the adjusting mechanism is respectively connected with the mounting structure and the resistance increasing component and is used for adjusting the relative position of the resistance increasing component and the mounting structure, so that the upward resistance of the foundation to the first cylinder is adjusted through the resistance increasing component.

In the construction method of the underground space, the adjusting mechanism is an oil cylinder mechanism, one end of the oil cylinder mechanism is detachably connected to the mounting structure, and the other end of the oil cylinder mechanism is connected with the resistance increasing component.

In the construction method of the underground space, the position of the resistance-increasing component in the vertical direction is lower than the position of the mounting structure.

In the construction method of the underground space, the position of the resistance-increasing component is flush with the position of the mounting structure in the vertical direction.

In the construction method of the underground space, the resistance increasing devices are circumferentially and symmetrically distributed.

In the construction method of the underground space, the reference marker is arranged on the outer side surface of the first cylinder and used for judging the sinking speed and/or the verticality of the first cylinder.

In the construction method of the underground space, the resistance increasing component is a top pressing plate.

The technical scheme of the invention has the following technical effects:

1. the embodiment of the invention discloses a self-sinking deep foundation pit retaining wall structure, which comprises: the cylindrical retaining wall body is formed with a soil breaking structure at the bottom and realizes downward soil breaking and sinking through the gravity cooperation of the soil breaking structure and the cylindrical retaining wall body; the resistance increasing device is arranged on the outer side wall of the cylindrical retaining wall body and used for being matched with a foundation to adjust the upward resistance of the cylindrical retaining wall body to the foundation. The soil breaking structure is formed at the bottom of the cylindrical retaining wall body, so that self-sinking can be realized without hammering operation, the construction procedures are fewer, the construction noise is less, the construction period is shorter, and the pollution to the surrounding environment is less; and the resistance increasing device is used for adjusting the upward resistance of the cylindrical retaining wall body to the foundation, so that the sinking speed and/or the verticality of the self-sinking deep foundation pit retaining wall structure can be controlled according to different soil body conditions.

2. In an embodiment of the present invention, the resistance increasing device includes an installation structure disposed on an outer sidewall of the cylindrical retaining wall body; a resistance increasing member; and the adjusting mechanism is respectively connected with the mounting structure and the resistance increasing component and used for adjusting the relative position of the resistance increasing component and the mounting structure so as to adjust the resistance which is applied to the cylindrical retaining wall body upwards by the foundation through the resistance increasing component. The adjustment mechanism capable of adjusting the relative position of the resistance increasing component and the mounting structure can well realize adjustment of resistance so as to realize control of the sinking speed and/or the verticality.

3. In the embodiment of the invention, the adjusting mechanism is an oil cylinder mechanism or a thread screwing mechanism, one end of the oil cylinder mechanism or the thread screwing mechanism is detachably connected to the mounting structure, and the other end of the oil cylinder mechanism or the thread screwing mechanism is connected with the resistance increasing component. The detachable connection mode can be detached after the cylindrical retaining wall body sinks to a certain position and when the resistance increasing device is not needed any more, so that subsequent repeated use is facilitated, and the construction cost is reduced.

4. The position of the resistance increasing component in the vertical direction is lower than that of the mounting structure, so that the mounting structure can support the resistance increasing component downwards and lift the cylindrical retaining wall body.

5. The resistance increasing devices are circumferentially and symmetrically distributed, and the symmetric distribution can be more favorable for adjusting the sinking speed and/or the verticality of the cylindrical retaining wall body.

6. The lateral surface of the cylindrical retaining wall body is provided with a reference marker, and constructors or related detection devices can use the reference marker as a reference object, so that the sinking speed and/or the verticality can be judged or detected more easily.

7. The resistance increasing component is a top pressure plate, and can form a larger soil body contact area on a foundation with larger water content, so that enough resistance can be guaranteed.

8. The embodiment of the invention provides a construction method of an underground space, which comprises the following steps: a. shallow base treatment; b. installing a first die body; c. installing reinforcing steel bars in the first die body, and pouring and tamping concrete in the first die body to obtain a first barrel; a ground breaking structure is formed at the bottom of the first cylinder; further comprising the steps of: d. arranging a resistance increasing device on the outer side wall of the first cylinder, wherein the resistance increasing device is used for being matched with a foundation to adjust the upward resistance of the foundation to the first cylinder; e. digging a soil transporting body outwards in the first barrel, so that the soil breaking structure is matched with the gravity of the first barrel to break soil downwards, and the first barrel sinks under the action of self gravity; and simultaneously, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the first cylinder, and the upward resistance of the foundation to the first cylinder is adjusted, so that the first cylinder reaches the target sinking speed and/or verticality. The soil breaking structure is formed at the bottom of the first cylinder body, so that self-sinking can be realized without hammering operation, the construction procedures are fewer, the construction noise is less, the construction period is shorter, and the pollution to the surrounding environment is less; and arranging a resistance increasing device for adjusting the upward resistance of the foundation to the first cylinder, so that the sinking speed and/or the verticality of the self-sinking type deep foundation pit retaining wall structure can be controlled according to different soil body conditions.

2. The embodiment of the invention also comprises the following steps: f. after the first cylinder body sinks to a preset depth, a second die body is installed above the first cylinder body, reinforcing steel bars are installed in the second die body, and concrete is poured and tamped in the second die body to obtain a second cylinder body; g. the resistance increasing device is arranged on the outer side wall of the second cylinder; h. and excavating and transporting soil bodies outwards in the first cylinder and the second cylinder, so that the second cylinder sinks under the action of self gravity, and meanwhile, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the second cylinder, so that the resistance of the foundation to the upward direction of the second cylinder is adjusted, and the second cylinder reaches the target sinking speed and/or verticality. Set up the second barrel above first barrel, can increase the height of barrel to satisfy the requirement of deep basal pit degree of depth set up on the second barrel and increase the resistance device, also can be through adjusting the resistance, in order to avoid two sections barrels overweight and lead to sinking speed too fast and/or straightness and receive too big influence.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of an embodiment of the self-sinking deep foundation pit retaining wall structure of the present invention;

FIG. 2 is a schematic view of another embodiment of the self-sinking deep foundation pit retaining wall structure of the present invention;

FIG. 3 is a top view of the self-sinking deep foundation pit retaining wall structure of FIG. 1 in accordance with the present invention;

fig. 4 is a flowchart of a construction method of an underground space structure according to the present invention.

Reference numerals:

1-a cylindrical retaining wall body; 2-breaking the soil; 3-an outer side wall; 4-resistance increasing device; 5-foundation base; 6-mounting a structure; 7-resistance increasing component; 8-adjusting mechanism.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.