WO2021243996A1

WO2021243996A1 - Retaining wall structure of self-sinking deep foundation pit, and construction method for underground space structure

Info

Publication number: WO2021243996A1
Application number: PCT/CN2020/134188
Authority: WO
Inventors: 刘献刚; 付豫楹; 胡子文; 刘若辉
Original assignee: 江西基业科技集团有限公司
Priority date: 2020-06-02
Filing date: 2020-12-07
Publication date: 2021-12-09
Also published as: CN111851506A

Abstract

A retaining wall structure of a self-sinking deep foundation pit comprises: a cylindrical retaining wall body (1), wherein a ground breaking structure (2) is formed at the bottom of the cylindrical retaining wall body (1), and the ground breaking structure (2) in combination with the weight of the cylindrical retaining wall body (1) breaks the ground downwards; and a resistance increasing device (4), provided on an outer side wall (3) of the cylindrical retaining wall body (1), and used to cooperate with a foundation (5) so as to adjust an upward resistance applied by the foundation (5) to the cylindrical retaining wall body (1). The ground breaking structure (2) is formed at the bottom of the cylindrical retaining wall body (1) so as to implement self-sinking without requiring a hammering operation, thereby simplifying a construction process, reducing construction noise, shortening a construction period, and reducing pollution to the surrounding environment. The resistance increasing device (4) is provided to adjust the upward resistance applied by the foundation (5) to the cylindrical retaining wall body (1) so as to control, according to different soil conditions, a sinking speed and/or verticality of the retaining wall structure of the self-sinking deep foundation pit.

Description

Construction method of self-sinking deep foundation pit retaining wall structure and underground space structure

Technical field

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

Background technique

The construction of underground buildings is too difficult and the cost is too high, especially when it involves soft soil foundation, the proportion of "foundation support" works is too large, and the "support cost" is often higher than the cost of the main building. In addition, the complex construction of underground projects leads to multiple procedures and difficult connections. The required construction period is too long, and the surrounding environment is too large, such as noise, vibration, exhaust gas, mud, etc., especially in densely populated areas. In the prior art, when supporting deep foundation pits, the retaining wall is mainly formed by piling. For example, Chinese patent document CN108708382A discloses a continuous retaining wall for deep foundation pits, in which the continuous occlusal part consists of at least one layer The piles are continuously interlocked with each other and are arranged annularly around the foundation pit; it also includes a water blocking component, which is inserted longitudinally at the occlusion of at least two adjacently arranged piles to prevent groundwater from flowing through the foundation of the continuous occluding part. The outside of the pit penetrates into the inside of the foundation pit; the water blocking component is channel steel or steel plate. With the above structure, the water blocking component can effectively prevent groundwater from penetrating into the inside of the foundation pit from the occlusion of two adjacent piles, thereby improving the water-stopping capacity of the continuous retaining wall of the deep foundation pit. Chinese Patent Document CN209308039U discloses a deep foundation pit underground space structure, which is characterized in that it includes: a foundation pit, the foundation pit is in the shape of a barrel; Are interlocked together to form a closed retaining wall; a number of internal support ring beams are fixedly arranged along the inner wall of the retaining wall to form a support for the retaining wall from the inside of the foundation pit to the soil, wherein the The spacing of the inner support ring beams gradually decreases from the top to the bottom of the foundation pit. The above two types of retaining walls for foundation pits are currently the two main types of retaining walls in the prior art, and both are constructed by means of piling.

Although the above two kinds of retaining walls can drive the pile to the design depth according to the construction requirements, the piling construction itself will cause such as more construction procedures, greater construction noise, longer construction period, and greater pollution to the surrounding environment. shortcoming.

If a deep foundation pit retaining wall structure can be designed to sink into the soil by its own gravity and avoid the process of hammering, the above technical problems can be better solved; however, due to the inconsistent soil conditions at the construction site For example, the water content of the soil at different depths is different, resulting in different frictional resistances encountered by the deep foundation pit retaining wall structure sinking to different depths, which affects the sinking speed, such as the sinking speed is too fast at a certain depth In addition, since the frictional resistance of the soil at different positions at the same horizontal depth will be different, it will affect the verticality of the deep foundation pit retaining wall structure when it is sinking, thereby affecting the quality of the project.

Summary of the invention

For this reason, the technical problem to be solved by the present invention is how to provide a method with fewer construction procedures, less construction noise, shorter construction period, less pollution to the surrounding environment, and can control the sinking speed according to soil conditions. The construction method of self-sinking deep foundation pit retaining wall structure and underground space adjusted with verticality.

The present invention provides a self-sinking deep foundation pit retaining wall structure, comprising: a cylindrical retaining wall body, wherein the bottom of the cylindrical retaining wall body is formed with a ground breaking structure, and the bottom of the cylindrical retaining wall body is formed with Earth-breaking structure, the barrel-shaped retaining wall body realizes downward earth-breaking and sinking through the gravity cooperation of the soil-breaking structure and the barrel-shaped retaining wall body; The resistance increasing device is used to cooperate with the foundation to adjust the upward resistance of the foundation to the cylindrical retaining wall body.

In the above-mentioned self-sinking deep foundation pit retaining wall structure, wherein the resistance increasing device includes an installation structure arranged on the outer side wall of the cylindrical retaining wall body; the resistance increasing component; The structure is connected to the resistance increasing component, and is used to adjust the relative position of the resistance increasing component and the mounting structure, so as to adjust the upward movement of the foundation to the cylindrical retaining wall body through the resistance increasing component. resistance.

In the above self-sinking deep foundation pit retaining wall structure, the adjustment mechanism is an oil cylinder mechanism or a screw threading mechanism, one end of the oil cylinder mechanism or the screw threading mechanism is detachably connected to the mounting structure, and the other end Connected with the resistance increasing component.

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 the position of the installation structure.

In the above self-sinking deep foundation pit retaining wall structure, the position of the resistance increasing component is flush with the position of the installation structure in the vertical direction.

In the above-mentioned self-sinking deep foundation pit retaining wall structure, the resistance increasing device is a plurality of circumferentially symmetrically distributed.

In the above-mentioned self-sinking deep foundation pit retaining wall structure, a reference marker is provided on the outer surface of the cylindrical retaining wall body for judging the sinking speed and/or verticality of the cylindrical retaining wall body.

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

The present invention also provides a construction method of an underground space, including the following steps: a. shallow foundation treatment; b. installing a first mold; c. installing steel bars in the first mold, and in the first mold The first cylinder is made by pouring concrete in the body; the bottom of the first cylinder is formed with a ground breaking structure; further comprising the following steps: d. A resistance increasing device is provided on the outer side wall of the first cylinder, wherein The resistance increasing device is used to cooperate with the foundation to adjust the upward resistance of the foundation to the first cylinder; e. excavate and transport the soil from the inside of the first cylinder, so that the ground breaking structure and the The gravity cooperation of the first cylinder realizes the downward breaking of the soil, so that the first cylinder sinks under the action of its own gravity; at the same time, it is adjusted according to the current sinking speed and/or verticality of the first cylinder The resistance increasing device adjusts the upward resistance of the foundation to the first cylinder, so that the first cylinder can reach a target sinking speed and/or verticality.

The construction method of the above underground space, which further includes the following steps: f. After the first cylinder sinks to a predetermined depth, a second mold is installed above the first cylinder, and the second mold is installed above the first cylinder. Install steel bars in the mold, and pour concrete in the second mold to make a second cylinder; g. The resistance increasing device is provided on the outer side wall of the second cylinder; h. From the first The inside of the cylinder and the second cylinder is digging and transporting soil outwards, so that the second cylinder sinks under the action of its own gravity, and at the same time according to the current sinking speed of the second cylinder and/or The verticality is used to adjust the resistance increasing device to adjust the upward resistance of the foundation to the second cylinder, so that the second cylinder can reach a target sinking speed and/or verticality.

In the construction method of the above underground space, the resistance increasing device includes an installation structure arranged on the outer side wall of the first cylinder; a resistance increasing component; and an adjustment mechanism, which are respectively connected to the installation structure and the The resistance increasing component is connected to adjust the relative position of the resistance increasing component and the mounting structure, so as to adjust the upward resistance applied by the foundation to the first cylinder through the resistance increasing component.

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

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

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

In the above construction method of underground space, the resistance increasing device is a plurality of circumferentially symmetrically distributed.

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

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

The above-mentioned technical solution of the present invention has the following technical effects:

1. The self-sinking deep foundation pit retaining wall structure disclosed in the embodiment of the present invention includes: a cylindrical retaining wall body, the bottom of the cylindrical retaining wall body is formed with a ground breaking structure, and the cylindrical retaining wall body passes through the breaking soil The structure cooperates with the gravity of the cylindrical retaining wall body to realize downward breaking and sinking; wherein, it also includes a resistance increasing device provided on the outer side wall of the cylindrical retaining wall body, and the resistance increasing device is used for Cooperate with the foundation to adjust the upward resistance of the foundation to the cylindrical retaining wall body. By forming the soil-breaking structure at the bottom of the cylindrical retaining wall body, self-sinking can be achieved without hammering, resulting in fewer construction procedures, less construction noise, shorter construction period, and impact on the surrounding environment. Pollution is small; a resistance increasing device is set to adjust the upward resistance of the foundation to the barrel-shaped retaining wall body, so that the sinking speed of the self-sinking deep foundation retaining wall structure can be controlled according to different soil conditions. / Or verticality.

2. In the embodiment of the present invention, the resistance increasing device includes a mounting structure arranged on the outer side wall of the cylindrical retaining wall body; a resistance increasing component; and an adjustment mechanism, which are respectively connected to the mounting structure and the The resistance increasing component is connected to adjust the relative position of the resistance increasing component and the mounting structure, so as to adjust the upward resistance applied by the foundation to the cylindrical retaining wall body through the resistance increasing component. The provision of an adjustment mechanism that can adjust the relative position of the resistance increasing component and the mounting structure can better realize the adjustment of the resistance, so as to realize the control of the sinking speed and/or the verticality.

3. In the embodiment of the present invention, the adjustment mechanism is an oil cylinder mechanism or a screw threaded mechanism, one end of the oil cylinder mechanism or the screw threaded mechanism is detachably connected to the mounting structure, and the other end is connected to the mounting structure. The resistance increasing component is connected. The detachable connection mode can be disassembled after the barrel-shaped retaining wall body sinks to a certain position and the resistance increasing device is no longer needed to facilitate subsequent repeated use, thereby reducing construction costs.

4. The position of the resistance increasing component in the vertical direction is lower than the position of the installation structure, so that the installation structure can support the resistance increasing component downward, and realize the top of the cylindrical retaining wall body. Rise effect.

5. The resistance increasing device is a plurality of circumferentially symmetrically distributed, and this symmetrical distribution can be more conducive to the adjustment of the sinking speed and/or the verticality of the cylindrical retaining wall body.

6. A reference marker is provided on the outer surface of the cylindrical retaining wall body. The construction personnel or related detection devices can use the reference marker as a reference, so as to make it easier to judge or detect the sinking speed and/or The verticality.

7. The resistance-increasing component is a top pressure plate, which can form a larger soil contact area on a foundation with a larger water content, so as to ensure that it can receive a large enough resistance.

8. The embodiment of the present invention provides a construction method of an underground space, including the following steps: a. shallow foundation treatment; b. installing a first mold; c. installing steel bars in the first mold, and in the The first cylinder is made by pouring concrete in the first mold; the bottom of the first cylinder is formed with a ground-breaking structure; it also includes the following steps: d. a resistance increasing device is provided on the outer side wall of the first cylinder, Wherein, the resistance increasing device is used to cooperate with the foundation to adjust the upward resistance of the foundation to the first cylinder; e. excavate and transport the soil outside the inside of the first cylinder, so that the soil is broken The structure cooperates with the gravity of the first cylinder to break the soil downward, so that the first cylinder sinks under the action of its own gravity; at the same time, according to the current sinking speed and/or verticality of the first cylinder The resistance increasing device is adjusted to adjust the upward resistance of the foundation to the first cylinder, so that the first cylinder can reach the target sinking speed and/or verticality. By forming the soil-breaking structure at the bottom of the first cylinder, self-sinking can be achieved without hammering, resulting in fewer construction procedures, less construction noise, shorter construction period, and pollution to the surrounding environment. Small; a resistance increasing device is provided to adjust the upward resistance of the foundation to the first cylinder, so that the sinking speed and/or of the self-sinking deep foundation pit retaining wall structure can be controlled according to different soil conditions Verticality.

2. The embodiment of the present invention further includes the following steps: f. After the first cylinder body sinks to a predetermined depth, a second mold body is installed above the first cylinder body, and steel bars are installed in the second mold body , And pour concrete in the second mold to make a second cylinder; g. The resistance increasing device is provided on the outer side wall of the second cylinder; h. In the first cylinder and the The inside of the second cylinder is digging and transporting the soil outwards, so that the second cylinder sinks under the action of its own gravity, and at the same time, it is adjusted according to the current sinking speed and/or verticality of the second cylinder The resistance increasing device adjusts the upward resistance of the foundation to the second cylinder, so that the second cylinder reaches the target sinking speed and/or verticality. Adding a second cylinder above the first cylinder can increase the height of the cylinder to meet the requirements of the deep foundation pit. A resistance increasing device is provided on the second cylinder, and the resistance can also be adjusted to Avoid the two sections of the cylinder from being too heavy and causing the sinking speed to be too fast and/or the verticality to be excessively affected.

Description of the drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

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

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

Figure 3 is a top view of the self-sinking deep foundation pit retaining wall structure of Figure 1 of the present invention;

Fig. 4 is a flow chart of the construction method of the underground space structure of the present invention.

Reference signs:

1-Cylinder-shaped retaining wall body; 2-breaking soil structure; 3-outer side wall; 4- resistance increasing device; 5- foundation; 6-mounting structure; 7- resistance increasing component; 8-adjusting mechanism.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work 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 can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a self-sinking deep foundation pit retaining wall structure, as shown in Figure 1, comprising: a cylindrical retaining wall body 1, wherein the bottom of the cylindrical retaining wall body 1 is formed with a ground breaking structure 2, so The cylindrical retaining wall body 1 is adapted to realize downward earth breaking and sinking through the gravity cooperation of the soil breaking structure 2 and the cylindrical retaining wall body itself; it also includes an outer side wall provided with the cylindrical retaining wall body 1 The resistance increasing device 4 on 3 is used to cooperate with the foundation 5 to adjust the upward resistance of the foundation 5 to the cylindrical retaining wall body 1. Wherein, the ground breaking structure is preferably a wedge-shaped edge structure with a beveled edge formed on the inner side of the bottom of the cylindrical retaining wall body, or a blade foot structure; wherein, the ground breaking structure is relatively opposite to the cylindrical retaining wall The outer side wall of the main body of the main body has an outwardly protruding structure, and the outer side of the protruding structure is vertically arranged or formed.

The resistance increasing device 4 preferably includes a mounting structure 6 arranged on the outer side wall 3 of the cylindrical retaining wall body 1; a resistance increasing component 7; and an adjustment mechanism 8, which are respectively connected to the mounting structure 5 and The resistance increasing component 6 is connected to adjust the relative position of the resistance increasing component 6 and the mounting structure 5, so as to adjust the foundation 5 to be applied upwards to the cylindrical retaining wall body 1 through the resistance increasing component 6 Of the resistance. Wherein, the adjustment mechanism is an oil cylinder mechanism or a screw threading mechanism, one end of the oil cylinder mechanism or the threading mechanism is detachably connected to the mounting structure, and the other end is connected to the resistance increasing component. The resistance increasing component is preferably lower than the position of the mounting structure in the vertical direction. When the cylindrical retaining wall body 1 is excessively inclined during the sinking process, the cylindrical retaining wall body 1 can be lifted to a vertical state by an oil cylinder mechanism or a threaded screw mechanism, and then excavated and adjusted until it is straightened.

As shown in FIG. 2, as another specific embodiment, the position of the resistance increasing component is flush with the position of the mounting structure in the vertical direction.

As shown in Fig. 3, in order to better adjust the sinking speed and/or verticality, the resistance increasing device may be several circumferentially symmetrically distributed. As a further improved embodiment, a reference marker is provided on the outer surface of the cylindrical retaining wall body for judging the sinking speed and/or verticality of the cylindrical retaining wall body.

In order to be able to adapt to the foundation conditions with a large water content, as a further improved implementation mode, the resistance increasing component may be a top pressure plate.

Example 2

As shown in Figure 4, the present invention also provides a construction method for an underground space, including the following steps: a. shallow foundation treatment; b. installing a first mold body; c. installing steel bars in the first mold body, and Pouring concrete in the first mold to make a first cylinder; the bottom of the first cylinder is formed with a ground-breaking structure (as shown in Figure 1); it also includes the following steps: d. in the first cylinder A resistance increasing device is provided on the outer side wall of the body, wherein the resistance increasing device is used to cooperate with the foundation to adjust the upward resistance of the foundation to the first cylinder; e. from the inside of the first cylinder to The soil is excavated and transported outside, so that the gravity of the ground breaking structure and the first cylinder can achieve downward breaking of the soil, so that the first cylinder sinks under the action of its own gravity; at the same time, according to the current first The sinking speed and/or verticality of the barrel are used to adjust the resistance increasing device, and the resistance of the foundation to the first barrel upward is adjusted, so that the first barrel can reach the target sinking speed and / Or verticality. By forming the soil-breaking structure at the bottom of the first cylinder, self-sinking can be achieved without hammering, resulting in fewer construction procedures, less construction noise, shorter construction period, and pollution to the surrounding environment. Small; a resistance increasing device is provided to adjust the upward resistance of the foundation to the first cylinder, so that the sinking speed and/or of the self-sinking deep foundation pit retaining wall structure can be controlled according to different soil conditions Verticality.

As a further improved implementation, the construction method of this embodiment further includes the following steps: f. After the first cylinder sinks to a predetermined depth, a second mold is installed above the first cylinder, and the Install steel bars in the second mold, and pour concrete in the second mold to make a second cylinder; g. The resistance increasing device is provided on the outer side wall of the second cylinder; h. The inside of the first cylinder and the second cylinder are digging and transporting soil outwards, so that the second cylinder sinks under the action of its own gravity, and at the same time according to the current sinking speed of the second cylinder And/or verticality to adjust the resistance increasing device to adjust the upward resistance of the foundation to the second cylinder, so that the second cylinder can reach the target sinking speed and/or verticality.

As shown in Figure 2, the resistance increasing device 4 preferably includes a mounting structure 5 arranged on the outer side wall 3 of the first cylinder 1; a resistance increasing component 6; and an adjustment mechanism 7, respectively The mounting structure 5 is connected to the resistance increasing component 6 and is used to adjust the relative position of the resistance increasing component 6 and the mounting structure 5, so as to adjust the foundation 5 through the resistance increasing component 6 to apply to the first The resistance of the cylinder 1 upward. Wherein, the adjustment mechanism may be an oil cylinder mechanism, one end of the oil cylinder mechanism is detachably connected to the mounting structure, and the other end is connected to the resistance increasing component. The resistance increasing component is preferably lower than the position of the mounting structure in the vertical direction. When the first cylinder 1 is excessively inclined during the sinking process, the first cylinder 1 can be lifted to a vertical state by an oil cylinder mechanism or a threaded screw mechanism, and then excavated and adjusted until it is straightened.

As another specific embodiment, the position of the resistance increasing component is flush with the position of the mounting structure in the vertical direction.

In order to be able to better adjust the sinking speed and/or verticality, the resistance increasing device may be several circumferentially symmetrically distributed. As a further improved embodiment, a reference marker is provided on the outer surface of the first cylinder for judging the sinking speed and/or verticality of the first cylinder.

In order to be able to adapt to foundation conditions with a large water content, as a further improved embodiment, the resistance increasing component may be a top pressure plate.

Obviously, the foregoing embodiments are merely examples for clear description, and are not intended to limit the implementation manners. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is unnecessary and impossible to list all the implementation methods here. The obvious changes or changes derived from this are still within the protection scope created by the present invention.

Claims

A self-sinking deep foundation pit retaining wall structure includes:

The barrel-shaped retaining wall body,

It is characterized by

A soil breaking structure is formed at the bottom of the cylindrical retaining wall body, and the cylindrical retaining wall body is adapted to realize downward soil breaking and sinking through the gravity cooperation of the soil breaking structure and the cylindrical retaining wall body;

It also includes a resistance increasing device provided on the outer side wall of the cylindrical retaining wall body, and the resistance increasing device is used to cooperate with the foundation to adjust the upward resistance of the foundation to the cylindrical retaining wall body.
The self-sinking deep foundation pit retaining wall structure according to claim 1, wherein the resistance increasing device comprises:

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

Resistance-increasing components; and

The adjustment mechanism is respectively connected to the mounting structure and the resistance increasing component, and is used to adjust the relative position of the resistance increasing component and the mounting structure, so as to adjust the foundation to the cylinder through the resistance increasing component. The resistance of the type retaining wall body upward.
The self-sinking deep foundation pit retaining wall structure according to claim 2, characterized in that:

The adjustment mechanism is an oil cylinder mechanism or a screw threading mechanism, one end of the oil cylinder mechanism or the screw threading mechanism is detachably connected to the mounting structure, and the other end is connected to the resistance increasing component.
The self-sinking deep foundation pit retaining wall structure according to claim 3, wherein the position of the resistance increasing component in the vertical direction is lower than the position of the installation structure.
The self-sinking deep foundation pit retaining wall structure according to claim 3, wherein the position of the resistance increasing component is flush with the position of the installation structure in the vertical direction.
The self-sinking deep foundation pit retaining wall structure according to claim 4 or 5, characterized in that:

The resistance increasing devices are several symmetrically distributed in the circumferential direction.
The self-sinking deep foundation pit retaining wall structure according to claim 6, characterized in that:

A reference marker is provided on the outer surface of the cylindrical retaining wall body for judging the sinking speed and/or verticality of the cylindrical retaining wall body.
The self-sinking deep foundation pit retaining wall structure according to claim 7, characterized in that:

The resistance increasing component is a top pressure plate.
A construction method of underground space, including the following steps:

a. Shallow foundation treatment;

b. Install the first phantom;

It is characterized in that it also includes:

c. Install steel bars in the first mold, and pour concrete in the first mold to make a first cylinder; wherein the bottom of the first cylinder is formed with a ground breaking structure;

d. A resistance increasing device is provided on the outer side wall of the first cylinder, wherein the resistance increasing device is adapted to cooperate with the foundation to adjust the upward resistance of the foundation to the first cylinder;

e. Excavate and transport the soil from the inside of the first cylinder, so that the ground breaking structure and the first cylinder cooperate with the gravity to achieve downward breaking of the soil, so that the first cylinder is subject to its own gravity At the same time, the resistance increasing device is adjusted according to the current sinking speed and/or verticality of the first cylinder, and the resistance of the foundation to the first cylinder is adjusted so as to make The first cylinder reaches the target sinking speed and/or verticality.
The construction method of the underground space according to claim 9, characterized in that it further comprises the following steps:

f. After the first cylinder sinks to a predetermined depth, install a second mold above the first cylinder, install steel bars in the second mold, and pour in the second mold The second cylinder is made of concrete;

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

h. Excavate and transport soil outside the inside of the first cylinder and the second cylinder, so that the second cylinder sinks under the action of its own gravity, and at the same time according to the current second cylinder To adjust the resistance increasing device to adjust the upward resistance of the foundation to the second cylinder, so that the second cylinder can reach the target sinking speed and/or Or verticality.