CN-121976562-A - Box culvert jacking construction method suitable for road underpass

CN121976562ACN 121976562 ACN121976562 ACN 121976562ACN-121976562-A

Abstract

The invention relates to the technical field of road underpass and discloses a box culvert jacking construction method suitable for the road underpass, which comprises the following construction steps of 1) constructing and forming an originating pit and a receiving pit on each side of a road, wherein a road foundation is arranged below the road and is positioned between the originating pit and the receiving pit, 2) arranging a box culvert in the originating pit, the front end of the box culvert is provided with a front end surface, the rear end of the box culvert is provided with a rear end surface, the front end surface is provided with a blade knife ring and is arranged perpendicular to the front end surface, 3) arranging a plurality of jacks on the originating pit against the rear end surface, 4) pushing the box culvert forwards by the plurality of jacks, cutting soil body of the road foundation by the blade knife ring, penetrating the box culvert into the road foundation, 5) outwards transporting and clearing the soil body in the culvert after the box culvert is pushed for a set length, 6) repeating the construction steps 5) until the box culvert is jacked into the road foundation to form the underpass. By optimizing the construction steps and the construction technology, the construction efficiency is improved.

Inventors

NIU SHUANGJIAN
HU XIAOSONG
CHEN JIAN
LIU TIEJUN
CHANG CHENG
LI JIANSHENG
MU XIAOBIN
MA LIWEI
LI SHICHENG
YU XU
ZHU LIJUN
REN DAJIANG

Assignees

深圳市政集团有限公司

Dates

Publication Date: 20260505
Application Date: 20260228

Claims (10)

1. The box culvert jacking construction method suitable for the road underpass is characterized by comprising the following construction steps of: 1) Constructing an originating pit on one side of a road, constructing a receiving pit on the other side of the road, and arranging a road foundation consisting of soil below the road, wherein the road foundation is positioned between the originating pit and the receiving pit; 2) The box culvert is arranged in the originating pit, and surrounds a duct which is arranged in a front-back through way, the front end of the box culvert is provided with a front end face which is annularly arranged, and the rear end of the box culvert is provided with a rear end face which is annularly arranged; 3) Arranging a plurality of jacks in the starting pit, wherein the jacks are propped against the backward end face of the box culvert; 4) The plurality of jacks push the box culvert forwards, forward horizontal thrust is applied to the box culvert, the edge knife ring cuts the soil body of the road foundation, and the box culvert penetrates into the road foundation; 5) In the process of penetrating the box culvert into the road foundation, the soil body of the road foundation enters the culvert of the box culvert, and after the box culvert is pushed for a set length, the soil body in the culvert is transported outwards and removed; 6) Repeating the construction step 5) until the box culvert is jacked into the road foundation, and forming a underpass by the culvert.
2. The construction method for jacking a box culvert suitable for a road underpass according to claim 1, wherein in the construction step 1), a transversely arranged supporting beam is arranged in the originating pit, the supporting beam is arranged towards a road foundation, and in the construction step 2), the box culvert is placed between the supporting beam and the road foundation, and the blade ring is arranged towards the road foundation; in the construction step 3), the rear end of the jack is fixedly arranged against the supporting beam, and the front end of the jack is against the rear end face of the box culvert.
3. The construction method for jacking a box culvert suitable for a road underpass according to claim 1, wherein in the construction step 2), the rearward end face is longitudinally arranged in a flat shape, and the forward end face is arranged obliquely rearward along the direction from top to bottom of the forward end face; The lower part of the rear-facing end surface is provided with a rear-facing lower surface which is horizontally arranged, the rear-facing lower surface is arranged opposite to the supporting beam, and the front ends of the jacks are abutted against the rear-facing lower surface so that the jacks are horizontally arranged.
4. The box culvert jacking construction method suitable for the road underpass according to claim 1, wherein in the construction step 2), a connecting plate is arranged on the front end face, the connecting plate is connected with the front end face in a superposition mode, the connecting plate is circumferentially arranged along the front end face, the edge knife ring is connected to the outer side of the connecting plate and is vertically arranged with the connecting plate, and the inner side of the connecting plate is arranged in an empty mode.
5. The construction method for jacking a box culvert suitable for a road underpass according to any one of claims 1-4, wherein in the construction step 2), an annular area is formed by enclosing between the edge knife ring and the connecting plate, the inner side of the annular area is opened and is arranged to form an inner side opening communicated with the culvert, and in the construction step 4), the edge knife ring cuts soil body of a road foundation, and the cut soil body enters the culvert along the annular area.
6. The box culvert jacking construction method suitable for the road underpass according to claim 5, wherein in the construction step 2), a plurality of partition plates are arranged in the annular area, and the partition plates are circumferentially arranged at intervals along the circumferential direction of the annular area; In the construction step 4), the edge knife ring circularly cuts the soil body of the road foundation, the cut soil body enters the annular area, and the soil body enters the culvert after being cut by a plurality of partition plates at multiple positions.
7. The method for jacking a culvert in a roadway-penetrating tunnel according to any one of claims 1-4, wherein in the construction step 1), a plurality of pipe curtains penetrate through the roadway foundation from an originating pit to a receiving pit, and in the construction step 6), after the culvert penetrates through the roadway foundation, the pipe curtains are respectively located above the culvert and on two sides of the culvert, and a friction soil body is formed between the pipe curtains and the culvert.
8. The construction method for jacking a box culvert suitable for a road underpass according to any one of claims 1-4, wherein in the construction step 2), grouting holes are respectively formed in two sides and the top of the box culvert, and the grouting holes penetrate through the box culvert and are communicated to the outside of the box culvert; In the construction step 5), in the process of penetrating a road foundation, the compound concentrated cement is injected outside the grouting holes, the compound concentrated cement permeates into gaps in friction soil bodies to strengthen the density of the friction soil bodies, and the compound concentrated cement is formed by mixing bentonite, powder chemical paste, polymer water stabilizing materials and water bodies.
9. The construction method for jacking a box culvert suitable for a road underpass according to claim 8, wherein in the construction step 5), thixotropic slurry is injected outside the box culvert through the grouting holes in the process of penetrating the road foundation, the thixotropic slurry forms an antifriction slurry sleeve on the periphery of the box culvert so that the periphery of the box culvert forms solid-liquid friction, and the thixotropic slurry is formed by mixing bentonite and water.
10. The box culvert jacking construction method suitable for the road underpass of claim 6, wherein cantilever sheets which are obliquely arranged are respectively arranged on two sides of the partition plate, the front ends of the cantilever sheets are butted at the side parts of the partition plate, the rear ends of the cantilever sheets extend backwards to form a cantilever end, the cantilever sheets are obliquely arranged away from the partition plate along the front-to-back direction of the cantilever sheets, and the cantilever sheets on two sides of the partition plate are obliquely arranged in an up-down dislocation manner; The cantilever piece and the lateral part of division board form the elasticity interval, be equipped with a plurality of guiding holes in the cantilever piece, the periphery butt joint of guiding hole has the guide arm, the guide arm is arranged in the elasticity interval, the inner butt joint of guide arm is on the cantilever piece, and is located the periphery of guiding hole, the outer end of guide arm towards the extension of suspension end arrange, and with interval arrangement between the suspension end.

Description

Box culvert jacking construction method suitable for road underpass Technical Field The invention relates to the technical field of road underpass, in particular to a box culvert jacking construction method suitable for road underpass. Background The box culvert jacking construction is an underground engineering construction method for building an underground passage below an existing road or an urban road, and is particularly suitable for a scene that an existing line needs to be penetrated down but traffic cannot be interrupted. However, in actual construction, the efficiency of box culvert jacking construction is often low, and the high-efficiency requirement of modern construction is difficult to meet. In the existing box culvert jacking construction technology, the construction is mainly finished by means of manual trimming and mechanical cooperation digging, in the mode, construction steps are multiple, the process is complex, the construction period is increased, the construction precision is easy to reduce, for example, soil around the box culvert is usually required to be trimmed manually in the box culvert jacking process, the efficiency is low, the digging depth and width are difficult to keep uniform, and the continuity and speed of box culvert propelling are further affected. In addition, the front end of the box culvert is not optimized enough for the blade part, soil in a road foundation is difficult to cut efficiently, the required thrust in the soil cutting and jacking process is obviously increased, and the construction progress is directly dragged slowly. Disclosure of Invention The invention aims to provide a box culvert jacking construction method suitable for a road underpass, and aims to solve the problem of lower box culvert jacking construction efficiency of the road underpass in the prior art. The invention discloses a box culvert jacking construction method suitable for a road underpass, which comprises the following construction steps: 1) Constructing an originating pit on one side of a road, constructing a receiving pit on the other side of the road, and arranging a road foundation consisting of soil below the road, wherein the road foundation is positioned between the originating pit and the receiving pit; 2) The box culvert is arranged in the originating pit, and surrounds a duct which is arranged in a front-back through way, the front end of the box culvert is provided with a front end face which is annularly arranged, and the rear end of the box culvert is provided with a rear end face which is annularly arranged; 3) Arranging a plurality of jacks in the starting pit, wherein the jacks are propped against the backward end face of the box culvert; 4) The plurality of jacks push the box culvert forwards, forward horizontal thrust is applied to the box culvert, the edge knife ring cuts the soil body of the road foundation, and the box culvert penetrates into the road foundation; 5) In the process of penetrating the box culvert into the road foundation, the soil body of the road foundation enters the culvert of the box culvert, and after the box culvert is pushed for a set length, the soil body in the culvert is transported outwards and removed; 6) Repeating the construction step 5) until the box culvert is jacked into the road foundation, and forming a underpass by the culvert. Further, in the construction step 1), a transversely arranged supporting beam is arranged in the starting pit, the supporting beam is arranged towards the road foundation, in the construction step 2), the box culvert is placed between the supporting beam and the road foundation, and the knife ring is arranged towards the road foundation; in the construction step 3), the rear end of the jack is fixedly arranged against the supporting beam, and the front end of the jack is against the rear end face of the box culvert. Further, in the construction step 2), the rear-facing end surface is longitudinally arranged in a flat shape, and the front-facing end surface is arranged in a rear inclined manner along the direction from top to bottom; The lower part of the rear-facing end surface is provided with a rear-facing lower surface which is horizontally arranged, the rear-facing lower surface is arranged opposite to the supporting beam, and the front ends of the jacks are abutted against the rear-facing lower surface so that the jacks are horizontally arranged. In the construction step 2), a connecting plate is arranged on the front end face, the connecting plate and the front end face are connected in a superposition mode, the connecting plate is circumferentially arranged along the front end face, the knife blade ring is connected to the outer side of the connecting plate and is vertically arranged with the connecting plate, and the inner side of the connecting plate is arranged in an empty mode. Further, in the construction step 2), an annular area is formed by enclosing the edge knife ring and the connecting p