CN111677012A - Pipe jacking working well structure for sandy soil layer and construction method thereof - Google Patents
Pipe jacking working well structure for sandy soil layer and construction method thereof Download PDFInfo
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- CN111677012A CN111677012A CN202010439976.4A CN202010439976A CN111677012A CN 111677012 A CN111677012 A CN 111677012A CN 202010439976 A CN202010439976 A CN 202010439976A CN 111677012 A CN111677012 A CN 111677012A
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- 239000002689 soil Substances 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 49
- 230000004888 barrier function Effects 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 60
- 239000010959 steel Substances 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 239000004576 sand Substances 0.000 abstract description 14
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 56
- 239000004567 concrete Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/125—Manhole shafts; Other inspection or access chambers; Accessories therefor characterised by the lining of the shaft
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention provides a pipe-jacking working well structure for a sandy soil layer and a construction method thereof, and relates to the field of pipe-jacking working wells. The pipe jacking working well structure for the sandy soil layer comprises a sunk well body and a peripheral supporting structure, wherein the peripheral supporting structure comprises a plurality of splicing units and a supporting frame, and the splicing units are arranged in a surrounding manner to form a protection space for accommodating the sunk well body; the hole has been seted up to the lateral wall of open caisson body, is equipped with a plurality of hole reinforcing piles between open caisson body and the peripheral supporting construction, and a plurality of hole reinforcing piles arrange the outside position that corresponds the hole in succession and constitute and consolidate the barrier layer. The splicing units block external sandy soil layers, prevent muddy water seepage and sandy soil from sliding into the protective space, and ensure safe and reliable construction of the open caisson body; the concatenation unit can adapt to rivers erosion and sand slip environment in the sandy soil layer of river system coastal, effectively shelters from the hole part of open caisson body through the hole reinforcing pile, has eliminated outer sand and has taken place the problem that the loss collapses.
Description
Technical Field
The invention relates to the technical field of pipe-jacking working wells, in particular to a pipe-jacking working well structure for sandy soil layers and a construction method thereof.
Background
In municipal pipe network engineering, for the condition that the pipeline buries deeply and underground water level is high, the pipe-jacking working well usually adopts an open caisson construction mode. Peripheral supporting structures are usually needed in open caisson construction of a pipe-jacking working well so as to ensure smooth sinking of the open caisson and prevent the problem of water inrush and sand inrush.
For example, the chinese utility model patent with the granted announcement number CN209099380U and the granted announcement date 2019.07.12 discloses an open caisson structure, and specifically discloses an open caisson structure comprising an open caisson body and an enclosure structure arranged around the open caisson structure body; the enclosure structure comprises filling piles and a high-pressure jet grouting support which are alternately arranged, wherein the filling piles are made of reinforced concrete. The cast-in-place pile can be used for bearing the lateral pressure of the soil body around the open caisson structure body, the cast-in-place pile and the high-pressure jet grouting support can form an integral impervious curtain, the underground water level in the enclosure structure is reduced, and the construction risks of inclination, deviation and piping of the open caisson structure body in the sinking construction process can be effectively prevented.
The sinking well structure in the prior art can play a role in supporting and preventing surging by using an impervious curtain formed by cast-in-place piles and high-pressure jet grouting supporting, but in a sandy soil layer along the bank of a water system, the high-pressure jet grouting piles are influenced by water flow erosion and sand slip, have poor forming quality and are difficult to form an effective protective barrier.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a pipe-jacking working well structure for sandy soil, so as to solve the problems that in sandy soil along a water system, due to the influence of water erosion and sand slip, the forming quality of a high-pressure jet grouting pile is poor, and it is difficult to form an effective protective barrier. Meanwhile, the invention also aims to provide a construction method of the pipe-jacking working well structure for sandy soil layers.
The technical scheme of the pipe jacking working well structure for the sandy soil layer comprises the following steps:
the pipe jacking working well structure for the sandy soil layer comprises a sunk well body and a peripheral supporting structure, wherein the peripheral supporting structure comprises a plurality of splicing units and a supporting frame fixedly connected to the splicing units, and the splicing units are arranged in a surrounding manner to form a protection space for accommodating the sunk well body;
the side wall of the open caisson body is provided with a hole, a plurality of hole reinforcing piles are arranged between the open caisson body and the peripheral supporting structure, and the hole reinforcing piles are continuously arranged at positions corresponding to the outer sides of the holes to form a reinforcing barrier layer.
Has the advantages that: the protection space is formed by surrounding the splicing units, the splicing units are fixedly supported by the support frame, and the external sandy soil layer is blocked by the splicing units, so that muddy water seepage and sandy soil sliding are prevented from entering the protection space, and the safe and reliable construction of the open caisson body is ensured; more importantly, in the process of constructing the peripheral protection, compared with a high-pressure jet grouting pile, the splicing unit can adapt to the water flow erosion and sandy soil slippage environments in the sandy soil layer along the bank of the water system, the construction quality and the protection effect of the peripheral supporting structure are better, and an effective protection barrier can be formed; the corresponding hole reinforcing pile that sets up in the hole position of open caisson body, effectively shelters from through the hole reinforcing pile to the hole part of open caisson body, and the silt particle of having avoided among the protective space has gushed into the open caisson body through the hole, has eliminated outer sand and has taken place the problem that the loss collapses.
Furthermore, the splicing units are steel sheet piles, connecting structures are arranged on the edges of the steel sheet piles, and the connecting structures of the adjacent steel sheet piles are meshed and matched.
Further, the steel sheet pile is the U-shaped channel-section steel, and is adjacent the U-shaped channel-section steel is notch staggered arrangement, connection structure is for setting up turn over along the structure at U-shaped channel-section steel edge, turn over along the structure with reserve between the lateral wall of U-shaped channel-section steel has the interlock clearance, and is adjacent turn over along the structure of U-shaped channel-section steel with interlock clearance phase-match.
Furthermore, braced frame is rectangular frame, rectangular frame is including fixing splice unit inboard horizontal cross beam, horizontal longeron and enhancement bracing, it is in to strengthen bracing fixed connection rectangular frame is close to the apex angle position.
Furthermore, the open caisson body is cylindrical, and the hole reinforcing piles are arranged on the outer side of the open caisson body in an arc shape.
Further, the hole reinforcing piles are high-pressure jet grouting piles, the high-pressure jet grouting piles correspond to the holes and are arranged to form an inner reinforcing barrier layer and an outer reinforcing barrier layer, and an overlapping portion is arranged between every two adjacent high-pressure jet grouting piles.
The technical scheme of the construction method of the pipe-jacking working well structure for the sandy soil layer comprises the following steps:
the construction method of the pipe jacking working well structure for the sandy soil layer comprises the following steps:
step one, determining the construction position of the open caisson body, and cleaning a construction area;
secondly, driving splicing units into the sandy soil layer of the construction position, wherein a plurality of splicing units surround to form a protection space for accommodating the open caisson body;
step three, sinking the open caisson body in the protection space;
and step four, continuously arranging hole reinforcing piles between the open caisson body and the peripheral protective structure, wherein the hole reinforcing piles form reinforcing barrier layers corresponding to the holes.
Has the advantages that: the protection space is formed by surrounding the splicing units, the splicing units are fixedly supported by the support frame, and the external sandy soil layer is blocked by the splicing units, so that muddy water seepage and sandy soil sliding are prevented from entering the protection space, and the safe and reliable construction of the open caisson body is ensured; more importantly, in the process of constructing the peripheral protection, compared with a high-pressure jet grouting pile, the splicing unit can adapt to the water flow erosion and sandy soil slippage environments in the sandy soil layer along the bank of the water system, the construction quality and the protection effect of the peripheral supporting structure are better, and an effective protection barrier can be formed; the corresponding hole reinforcing pile that sets up in the hole position of open caisson body, effectively shelters from through the hole reinforcing pile to the hole part of open caisson body, and the silt particle of having avoided among the protective space has gushed into the open caisson body through the hole, has eliminated outer sand and has taken place the problem that the loss collapses.
Furthermore, in the second step, the splicing units are steel sheet piles, the adjacent connecting structures of the steel sheet piles are controlled to be occluded, matched and driven into a sandy soil layer, and after the steel sheet piles are driven into the sandy soil layer, a supporting frame is arranged inside the steel sheet piles.
Further, in the third step, cutting a sandy soil layer by utilizing the blade foot at the lower part of the open caisson body, digging and discharging the sand and mud in the open caisson body during sinking, and pouring and heightening the upper part of the open caisson body layer by layer.
Further, in the fourth step, the hole reinforcing piles are high-pressure jet grouting piles, an inner reinforcing barrier layer and an outer reinforcing barrier layer are arranged on the outer side of the open caisson body, and the high-pressure jet grouting piles are arranged in an overlapping mode.
Drawings
FIG. 1 is a schematic front view of a pipe jacking working well structure in the embodiment 1 of the invention for sandy soil;
FIG. 2 is a schematic top view of a pipe-jacking working well structure according to a specific embodiment 1 of the present invention;
fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.
In the figure: 1-open caisson body, 10-cutting edge, 11-first hole, 12-second hole, 2-U-shaped channel steel, 20-protective space, 21-flanging structure, 3-supporting frame, 31-horizontal cross beam, 32-horizontal longitudinal beam, 33-reinforcing diagonal brace, 4-high-pressure jet grouting pile and 40-overlapping part.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the embodiment 1 of the pipe jacking working well structure for the sandy soil layer, as shown in fig. 1 to 3, the pipe jacking working well structure for the sandy soil layer comprises a caisson body 1 and a peripheral supporting structure, wherein the peripheral supporting structure comprises a plurality of splicing units and a supporting frame 3 fixedly connected with the splicing units, and the splicing units are arranged in a surrounding manner to form a protective space 20 for accommodating the caisson body 1; wherein, the hole has been seted up to the lateral wall of open caisson body 1, is equipped with a plurality of hole reinforcing piles between open caisson body 1 and the peripheral supporting construction, and a plurality of hole reinforcing piles arrange the outside position that corresponds the hole in succession and constitute and consolidate the barrier layer.
The protection space 20 is formed by surrounding the splicing units, the splicing units are fixedly supported by the support frame 3, and the external sandy soil layer is blocked by the splicing units, so that muddy water seepage and sandy soil sliding are prevented from entering the protection space 20, and the safe and reliable construction of the open caisson body 1 is ensured; more importantly, in the process of constructing the peripheral protection, compared with a high-pressure jet grouting pile, the splicing unit can adapt to the water flow erosion and sandy soil slippage environments in the sandy soil layer along the bank of the water system, the construction quality and the protection effect of the peripheral supporting structure are better, and an effective protection barrier can be formed; the corresponding hole reinforcing pile that sets up in the hole position of open caisson body 1 through hole reinforcing pile effectively shelters from the hole part of open caisson body 1, has avoided the silt particle in the guard space 20 to gush into open caisson body 1 through the hole, has eliminated outer sand and has taken place the problem that the loss collapses.
The splicing units are steel sheet piles, connecting structures are arranged at the edges of the steel sheet piles, and the connecting structures of the adjacent steel sheet piles are meshed and matched. Specifically, the steel sheet pile is U-shaped channel-section steel 2, and adjacent U-shaped channel-section steel 2 is notch staggered arrangement, and connection structure is for setting up at 2 marginal turn-ups along structure 21 of U-shaped channel-section steel, turns over and has the interlock clearance between the lateral wall of following structure 21 and U-shaped channel-section steel 2, and the turn-ups along structure 21 and interlock clearance phase-match of adjacent U-shaped channel-section steel 2. As shown in fig. 2 and 3, the turning structure 21 of the U-shaped channel steel 2 is in a barb shape, the outline shape of the occlusion gap formed between the outer walls of the turning structure 21 and the U-shaped channel steel 2 is matched with the turning structure 21, the notches of the U-shaped channel steel 2 are outwards staggered with the notches inwards during construction, and the turning structure 21 of the adjacent U-shaped channel steel 2 forms an effective occlusion effect, so that a complete peripheral protective barrier is built.
For the convenience of splicing, the U-shaped channel steel 2 is arranged, the supporting frame 3 is a rectangular frame, the rectangular frame comprises a horizontal cross beam 31, a horizontal longitudinal beam 32 and a reinforcing inclined strut 33 which are fixed on the inner side of the U-shaped channel steel 2, and the reinforcing inclined strut 33 is fixedly connected to the rectangular frame and close to the top corner position. The horizontal cross beam 31 and the horizontal longitudinal beam 32 are fixedly connected to form a rectangular frame, so that the U-shaped channel steel 2 positioned on the outer side of the side edge can be firmly kept at a protective blocking position, and the phenomenon that the U-shaped channel steel is unstable and falls off under the pressure action of mud and sand is avoided; the reinforcing inclined strut 33, the horizontal cross beam 31 and the horizontal longitudinal beam 32 form a triangular stable structure, and the support frame 3 is ensured not to deform and damage.
Two holes are oppositely arranged on the side wall of the open caisson body 1, the holes 1 are respectively a first hole 11 and a second hole 12, and the first hole 11 and the second hole 12 are distributed in a vertically staggered manner. In this embodiment, the caisson body 1 is cylindrical, and the plurality of hole reinforcing piles are arranged outside the caisson body 1 in an arc shape. Specifically, the hole reinforcing pile is a high-pressure jet grouting pile 4, the plurality of high-pressure jet grouting piles 4 are arranged corresponding to the holes to form an inner reinforcing barrier layer and an outer reinforcing barrier layer, and an overlapping portion 40 is arranged between the adjacent high-pressure jet grouting piles 4.
Correspond the position of first hole 11 in the outside of open caisson body 1 promptly and be equipped with a plurality of high pressure jet grouting stake 4, the position that corresponds second hole 12 in the outside of open caisson body 1 is equipped with a plurality of high pressure jet grouting stake 4, a plurality of high pressure jet grouting stake 4 have formed respectively inside, outer two-layer barrier layer, to first hole 11, second hole 12 has played effectual effect of sheltering from, prevent that silt particle from first hole 11, during open caisson body 1 is gushed into to second hole 12, guaranteed to have filled the silt particle of capacity between open caisson body 1 and the peripheral protective structure all the time, the integrality and the stability of the outside sandy soil layer of open caisson body 1 have been ensured.
The construction method of the pipe-jacking working well structure for sandy soil layers is described in detail as follows, and comprises the following steps:
step one, determining the construction position of the open caisson body 1, and cleaning a construction area; determining the construction position of the open caisson body 1 according to a design drawing, and performing site cleaning and leveling on a construction area after rechecking; then, set up the control point in the field, the control point is as the reference point, sets up the mark on the open caisson body 1, and in the construction process of sinking, the relative position of mark and the control point of open caisson body 1 need to be controlled to ensure that open caisson body 1 sinks to target in place accurately.
Secondly, driving the splicing units into a sandy soil layer of a construction position, wherein a plurality of splicing units surround to form a protection space 20 for accommodating the open caisson body 1; and in the second step, the splicing units are steel sheet piles, the adjacent steel sheet piles are controlled to be occluded, matched and driven into a sandy soil layer, and after the steel sheet piles are driven into the sandy soil layer, the supporting frames 3 are arranged inside the steel sheet piles. Specifically, the steel sheet pile is U-shaped channel-section steel 2, and the edge structure 21 interlock each other is turned over of the adjacent U-shaped channel-section steel 2 of control, utilizes the pile driver to squeeze into the vertical sand nature soil layer downwards of U-shaped channel-section steel 2, then sets up braced frame 3 in U-shaped channel-section steel 2 is inside, plays the reinforcement supporting role to U-shaped channel-section steel 2.
Step three, sinking the open caisson body 1 in the protection space 20; in the third step, cutting a sandy soil layer by utilizing the blade foot 10 at the lower part of the open caisson body 1, digging and discharging the mud and sand inside the open caisson body 1 during sinking, and pouring and heightening the upper part of the open caisson body 1 layer by layer. The open caisson body 1 is manufactured by adopting a cast-in-place manufacturing mode
3.1, setting an open caisson template: the open caisson templates are vertically supported in layers, an inner plate and an outer plate of the open caisson templates are fixed, and vertical seams between the open caisson templates are subjected to plugging and waterproofing treatment;
3.2, building a steel bar in the open caisson template, binding and fixing: a positioning support is arranged between the steel bar and the open caisson template, and after the steel bar is bound, a homojunction mortar cushion block is adopted to control the protective layer, so that the effective sectional area of the steel bar in the concrete is ensured;
3.3, pouring concrete: uniformly pouring concrete in the open caisson template, uniformly discharging to avoid inclination of the open caisson body 1, adopting a flexible shaft vibrator to carry out vibration compaction, carrying out concrete pouring on a second layer after the concrete of a first layer is solidified to reach 70% of strength, roughening and washing the upper side surface of the concrete of the first layer, pouring and paving a layer of rich-grout concrete with the same label, and then pouring the concrete of the second layer;
3.4, after the open caisson body 1 is poured, maintaining and removing the formwork in time, and performing sinking construction after the strength of the blade foot 10 reaches 100% after the open caisson body 1 reaches 70% of the strength;
3.5, sinking the open caisson body 1: scouring the sand inside the open caisson body 1 by using a high-pressure water gun to ensure that the sand and water flow converge to form slurry, and discharging the slurry out of the open caisson by using a hydraulic suction dredge and a sludge discharge pipe;
3.6, correcting the deviation in the sinking process: when sinking, controlling to uniformly remove earth, carrying out position measurement through the control points and marks of the open caisson body 1, correcting deviation in time when the sinking height and the flatness have deviation, and ensuring the position balance of the open caisson body 1 by adopting a soil removal and/or weight correction mode;
3.7, final sinking and bottom sealing of the open caisson: and stopping taking soil when the open caisson body 1 sinks to a depth of 20cm away from the design depth, sinking to the design depth by means of the gravity of the open caisson body 1, cleaning floating mud and sediments at the bottom before bottom sealing, and pouring concrete to bottom sealing after leveling.
And step four, continuously arranging hole reinforcing piles between the open caisson body 1 and the peripheral protective structure, wherein the plurality of hole reinforcing piles form reinforcing barrier layers corresponding to the holes. In the fourth step, the hole reinforcing piles are high-pressure jet grouting piles 4, an inner reinforcing barrier layer and an outer reinforcing barrier layer are arranged on the outer side of the open caisson body 1, and the adjacent high-pressure jet grouting piles 4 are arranged in an overlapping mode. The hole has been played effectual effect of sheltering from, prevents that silt particle from gushing into the open caisson body 1 from the hole, has ensured the integrality and the stability of the outside sandy soil layer of open caisson body 1.
In other specific embodiments of the pipe-jacking working well structure for sandy soil layers, in order to meet different construction requirements, the splicing units are not limited to the U-shaped channel steel in the specific embodiment 1, but also can be used for straight plate structures or Z-shaped steel sheet piles, and can be spliced and combined to form a peripheral supporting structure. Or the shape of the supporting frame can be designed into a circle or other polygons according to actual conditions, and the splicing units can be fixed and supported.
The specific embodiment of the construction method of the pipe-jacking working well structure for sandy soil layers of the present invention is the same as each specific embodiment of the construction method of the pipe-jacking working well structure for sandy soil layers in the specific embodiment of the pipe-jacking working well structure for sandy soil layers of the present invention, and is not described herein again.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A pipe jacking working well structure for a sandy soil layer is characterized by comprising a caisson body and a peripheral supporting structure, wherein the peripheral supporting structure comprises a plurality of splicing units and a supporting frame fixedly connected to the splicing units, and the splicing units are arranged in a surrounding manner to form a protection space for accommodating the caisson body;
the side wall of the open caisson body is provided with a hole, a plurality of hole reinforcing piles are arranged between the open caisson body and the peripheral supporting structure, and the hole reinforcing piles are continuously arranged at positions corresponding to the outer sides of the holes to form a reinforcing barrier layer.
2. The pipe jacking working well structure for sandy soil layers as claimed in claim 1, wherein the splicing units are steel sheet piles, connecting structures are arranged at edges of the steel sheet piles, and the connecting structures of adjacent steel sheet piles are engaged and matched.
3. The pipe jacking working well structure for sandy soil layers as claimed in claim 2, wherein the steel sheet pile is a U-shaped channel steel, adjacent U-shaped channel steel are arranged in a notch staggered manner, the connecting structure is an edge turning structure arranged at the edge of the U-shaped channel steel, an occlusion gap is reserved between the edge turning structure and the outer side wall of the U-shaped channel steel, and the edge turning structure of the adjacent U-shaped channel steel is matched with the occlusion gap.
4. The pipe jacking working well structure for sandy soil layers according to claim 2, wherein the support frame is a rectangular frame, the rectangular frame comprises horizontal cross beams, horizontal longitudinal beams and reinforcing diagonal braces, the horizontal cross beams, the horizontal longitudinal beams and the reinforcing diagonal braces are fixed on the inner sides of the splicing units, and the reinforcing diagonal braces are fixedly connected to the positions, close to the top corners, of the rectangular frame.
5. The pipe-jacking working well structure for sandy soil layers as claimed in claim 2, wherein the open caisson body is cylindrical in shape, and the plurality of hole reinforcing piles are arranged in an arc shape outside the open caisson body.
6. The pipe jacking work well structure for sandy soil according to claim 5, wherein said hole-reinforcing piles are high-pressure jet grouting piles, a plurality of said high-pressure jet grouting piles are arranged corresponding to said holes to form an inner-layer reinforcing barrier layer and an outer-layer reinforcing barrier layer, and an overlapping portion is provided between adjacent high-pressure jet grouting piles.
7. A construction method of a pipe-jacking working well structure for sandy soil layers is characterized by comprising the following steps:
step one, determining the construction position of the open caisson body, and cleaning a construction area;
secondly, driving splicing units into the sandy soil layer of the construction position, wherein a plurality of splicing units surround to form a protection space for accommodating the open caisson body;
step three, sinking the open caisson body in the protection space;
and step four, continuously arranging hole reinforcing piles between the open caisson body and the peripheral protective structure, wherein the hole reinforcing piles form reinforcing barrier layers corresponding to the holes.
8. The construction method of the pipe-jacking working well structure for the sandy soil layer as claimed in claim 7, wherein in the second step, the splicing units are steel sheet piles, the connection structures of the adjacent steel sheet piles are controlled to be meshed, matched and driven into the sandy soil layer, and a support frame is arranged inside the steel sheet piles after the steel sheet piles are driven into the sandy soil layer.
9. The construction method of a pipe-jacking working well structure for sandy soil according to claim 7, wherein in the third step, the sandy soil is cut by using a blade foot at the lower part of the open caisson body, the silt inside the open caisson body is dug and discharged during sinking, and the upper part of the open caisson body is heightened by pouring layer by layer.
10. The method of claim 7, wherein the hole-reinforced piles are high-pressure jet grouting piles, and an inner-layer reinforced barrier layer and an outer-layer reinforced barrier layer are provided outside the open caisson body in the fourth step, and the high-pressure jet grouting piles are arranged to overlap each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010439976.4A CN111677012A (en) | 2020-05-21 | 2020-05-21 | Pipe jacking working well structure for sandy soil layer and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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