CN-122013784-A - Directional full-hall high-pressure guniting support system and construction method

CN122013784ACN 122013784 ACN122013784 ACN 122013784ACN-122013784-A

Abstract

The invention belongs to the technical field of foundation pit support, and particularly relates to a directional full-hall high-pressure grouting support system and a construction method, wherein the directional full-hall high-pressure grouting support system comprises a pile driver, a hole-forming grouting plate, stirring grouting equipment and slurry supply equipment, the hole-forming grouting plate comprises a strip-shaped body, one side of the body is provided with a grouting hole, the other side of the body is provided with a meshing structure matched with the grouting hole, when the adjacent hole-forming grouting plate is driven in, the adjacent hole-forming grouting plate is mutually meshed through the meshing structure and the grouting hole, the pile driver is used for driving the hole-forming grouting plate into a preset depth of a foundation pit design support area, the stirring grouting equipment is used for preparing cement slurry, the slurry supply equipment is a grouting machine, and the stirring grouting equipment is connected with the grouting machine, and the beneficial effects of the invention are that: the pore-forming grouting plate plays a role in temporary support and the cement soil plays a role in long-term protection; grouting is carried out while the pore-forming grouting plate is slowly pulled out, and slurry is filled in the gaps and is solidified with surrounding soil to form a slurry-soil solidified pile, so that the foundation pit bottom is effectively prevented from rising.

Inventors

CUI XIN
XIE QINGHE
WANG ZHONGFENG
GENG TONGZHE
KANG QIAN
ZHANG BO
MA XIAOJIE
BI YANMEI

Assignees

中建八局第二建设有限公司
中国建筑第八工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. The directional full-hall high-pressure grouting support system is characterized by comprising a pile driver, a hole-forming grouting plate, stirring grouting equipment and grouting equipment, wherein the hole-forming grouting plate comprises a body, a grouting hole is formed in one side of the body, an engagement structure matched with the grouting hole is arranged on the other side of the body, the adjacent hole-forming grouting plate is mutually engaged with the grouting hole through the engagement structure when being driven in, the pile driver is used for driving the hole-forming grouting plate into a preset depth of a foundation pit design support area, the stirring grouting equipment is used for preparing cement slurry, the grouting equipment is a grouting machine, and the stirring grouting equipment is connected with the grouting machine and is used for spraying the prepared cement slurry into the ground through the grouting hole under high pressure.
2. The directional full-hall high-pressure guniting support system according to claim 1, wherein a plurality of groups of axial transfer grooves are formed in the top end of the engagement structure in a circumferential array, the axial transfer grooves are communicated with step clamping grooves, and the grouting holes are flexibly clamped with the engagement structure through elastic clamping claws.
3. The directional full-hall high-pressure guniting support system according to claim 2, wherein a plurality of groups of first axial blind holes are formed in the top end of the grouting hole in a circumferential array, one end of each elastic claw is flexibly inserted into each first axial blind hole, each elastic claw comprises a spring and a limiting column, a second axial blind hole is formed in one end of each limiting column, a clamping protruding head is fixedly connected to the other end of each limiting column, and two ends of each spring are respectively fixed in the first axial blind hole and the second axial blind hole.
4. The directional full-hall high-pressure guniting support system according to claim 3, wherein parallel double guide rails are paved in the first axial blind hole, the limit posts are slidably connected with the double guide rails through a sliding block set, and the guide tail ends of the double guide rails are fixedly connected with limit plates.
5. The directional full-hall high-pressure guniting support system according to claim 1, wherein the stirring pulping equipment is a double-horizontal-shaft forced stirring main machine, a spiral belt type mixer, a pneumatic mixer, a paddle mixer or a turbine type mixer.
6. The directional full-hall high-pressure guniting support system according to claim 1, wherein the grouting machine is of a pneumatic driving type, a hydraulic pumping type or a rotor type structure.
7. A construction method of a directional full-hall high-pressure guniting support system is characterized in that the construction method of the directional full-hall high-pressure guniting support system in claim 1 comprises the following steps, Firstly, driving a hole-forming grouting plate into a preset depth of a foundation pit design supporting area by using a pile driver, and completing foundation pit excavation and structure construction within the surrounding and protecting range of the hole-forming grouting plate to play a role in temporary supporting; step two, preparing cement slurry by stirring pulping equipment; Step three, high-pressure grouting, namely connecting stirring grouting equipment with a grouting machine, injecting prepared slurry through a pipeline from grouting holes of a hole-forming grouting plate, spraying the slurry into the ground through the lower end of the grouting holes at high pressure, and slowly pulling out the hole-forming grouting plate while grouting; And step four, after the extraction and grouting of the single hole-forming grouting plate are completed, the operation of the step three is sequentially repeated for the rest hole-forming grouting plates until the construction of all the hole-forming grouting plates in the designed support area is completed.
8. The method of claim 7, wherein in the first step, the plurality of grouting plates are embedded to form a continuous integral enclosure, the grouting holes are inserted directly or obliquely at a certain angle with the engagement structure, and the height of the grouting plates exposed out of the ground is not less than 300mm.
9. The construction method of the directional full-hall high-pressure grouting support system according to claim 7, wherein in the third step, grouting speed is controlled to be 10-100L/min, grouting pressure is maintained to be 0.5-4.5MPa, and grouting is maintained for 24-72 h after being pressed into soil.
10. The method of claim 9, wherein in the third step, when the ground surface is continuously and stably blasted, the grouting point is determined to reach the grouting effect, and the grouting operation is terminated.

Description

Directional full-hall high-pressure guniting support system and construction method Technical Field The invention relates to the technical field of foundation pit support, in particular to a directional full-hall high-pressure guniting support system and a construction method. Background With the rapid development of urban construction, the construction projects of adjacent subways or other important structures are increased, and the construction scenes have extremely high requirements on the safety and stability of foundation pit support. In the foundation pit excavation process, earthwork excavation and soil unloading are easy to cause the problem of pit bottom uplift of the foundation pit, and the construction safety of the foundation pit is affected. If the viaduct is constructed within the range of 10m of the subway, the excavation of the foundation pit of the bearing platform can lead to the unloading of soil around the subway and the displacement of the subway tunnel, and the structures such as the overhead bridge, the column, the bearing platform and the like constructed in the foundation pit can downwards transfer the load, so that the soil under the bearing platform is extruded to the periphery, lateral pressure is formed on the subway tunnel, the displacement deformation of the subway tunnel is further caused, and serious engineering potential safety hazards exist. The existing foundation pit supporting technology is difficult to solve the problems of foundation pit bottom bulge and interference to surrounding important structures at the same time, lacks a supporting mode with strong pertinence and controllable construction, and cannot meet the foundation pit construction requirements of adjacent important structures. Disclosure of Invention The invention aims at the problems in the prior art, and specifically designs a directional full-hall high-pressure guniting support system and a construction method thereof, so as to solve the defects in the prior art. In order to achieve the above purpose, the invention provides a directional full-hall high-pressure grouting support system, which comprises a pile driver, a hole-forming grouting plate, stirring grouting equipment and grouting equipment, wherein the hole-forming grouting plate comprises a body, a grouting hole is formed in one side of the body, a meshing structure matched with the grouting hole is arranged on the other side of the body, the adjacent hole-forming grouting plates are mutually spliced through the meshing structure and the grouting hole when being driven in, the pile driver is used for driving the hole-forming grouting plate into a preset depth of a foundation pit design support area, the stirring grouting equipment is used for preparing cement paste, the grouting equipment is a grouting machine, and the stirring grouting equipment is connected with the grouting machine and used for spraying the prepared cement paste into the ground through the grouting hole under high pressure. Further, the top end of the engagement structure is provided with a plurality of groups of axial transfer grooves in a circumferential array, the axial transfer grooves are communicated with step clamping grooves, and the grouting holes are flexibly clamped with the engagement structure through elastic clamping claws. Furthermore, a plurality of groups of axial blind holes I are formed in the top end of the grouting hole in a circumferential array, one end of each elastic claw is flexibly inserted into one axial blind hole I, each elastic claw comprises a spring and a limiting column, one end of each limiting column is provided with one axial blind hole II, the other end of each limiting column is fixedly connected with a clamping convex head, and two ends of each spring are respectively fixed in the corresponding axial blind hole I and the corresponding axial blind hole II. Further, parallel double guide rails are paved in the first axial blind holes, the limiting columns are connected with the double guide rails in a sliding mode through the sliding block groups, and the limiting plates are fixedly connected to the guiding tail ends of the double guide rails. Further, the stirring pulping equipment is a double horizontal shaft forced stirring main machine, a spiral belt type mixer, a pneumatic stirrer, a paddle stirrer or a turbine stirrer. Further, the grouting machine is of a pneumatic driving type, hydraulic pumping type or rotor type structure. The invention also discloses a construction method of the directional full-hall high-pressure guniting support system, which comprises the following steps: firstly, driving a hole-forming grouting plate into a preset depth of a foundation pit design supporting area by using a pile driver, and completing foundation pit excavation and structure construction within the surrounding and protecting range of the hole-forming grouting plate to play a role in temporary supporting; step two, preparing cement slurry by