CN115341552A - Underground continuous wall joint water seepage prevention structure, underground continuous wall and construction method - Google Patents
Underground continuous wall joint water seepage prevention structure, underground continuous wall and construction method Download PDFInfo
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- CN115341552A CN115341552A CN202210938262.7A CN202210938262A CN115341552A CN 115341552 A CN115341552 A CN 115341552A CN 202210938262 A CN202210938262 A CN 202210938262A CN 115341552 A CN115341552 A CN 115341552A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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Abstract
The invention provides a seepage-proofing structure for joints of underground continuous walls, which can achieve good seepage-proofing effect by matching an extrusion steel piece with a rubber water stop strip; and the structure is simple. This seam prevention of seepage water structure includes: h-shaped steel, a rubber water stop strip and an extrusion steel piece; the extrusion steel piece is vertically arranged in the subsequent groove section of the diaphragm wall and is positioned between the two steel plates A of the H-shaped steel; the extrusion steel piece is connected with the ground wall reinforcement cage, is in sliding fit with the ground wall reinforcement cage, and can horizontally slide along the direction towards the H-shaped steel; rubber water stop bars are arranged on the inner sides of the two steel plates A of the H-shaped steel facing the subsequent groove section of the diaphragm wall and fixed on the inner sides of the steel plates A; the extrusion steel piece has two extrusion ends, and when the extrusion steel piece slided towards the direction of H shaped steel, two extrusion ends extruded two inboard rubber sealing rod of steel sheet A respectively. In addition, the invention provides an underground continuous wall with the seepage-proofing structure and a construction method.
Description
Technical Field
The invention relates to a joint water seepage prevention structure, in particular to an underground diaphragm wall joint water seepage prevention structure and a construction method, and belongs to the technical field of foundation pit supporting.
Background
The underground continuous wall is an important supporting structure form in foundation pit supporting, and has the advantages of high rigidity, reliable quality, good seepage-proofing performance, high economic benefit and small influence on a stop body and a structural object around the foundation pit, so that the underground continuous wall is widely applied to projects such as water-rich weak strata, deep foundation pits and the like.
Common joint forms of the underground diaphragm wall include a fore shaft pipe joint, a cross-shaped steel plate joint, an I-shaped steel plate joint and the like. The fore shaft pipe joint is a flexible joint, the construction and installation process is mature, the cost is low, but the joint rigidity is poor, the self weight is large, and the seepage-resistant and streaming-resistant functions at the joint are poor. The cross-shaped steel plate joint is a rigid joint, is usually applied to construction of deeper continuous walls, has better shearing resistance, simple construction process and short construction period, increases a water seepage path by the steel plate arranged at the joint, has better seepage-proofing capacity, but has larger self gravity, more working procedures and large steel content, but has certain difficulty in brushing walls and cleaning side wall slurry. The I-shaped steel plate joint is a rigid joint, can bear the vertical torque and the horizontal shearing force, increases the anti-streaming path and has good impermeability, but the I-shaped steel joint has complex welding process flow, high processing quality requirement and difficult protection of the anti-streaming iron sheet in construction.
In the actual construction process, because the level of sub-assembly teams is uneven, the joint scouring process and the quality often cannot achieve the ideal expected effect, so that how to radically cure or improve the phenomena of flowing water and sand of the underground diaphragm wall joint after the foundation pit is excavated is still a big problem in the current foundation pit supporting engineering.
Disclosure of Invention
In view of the above, the invention provides a joint water seepage prevention structure of an underground continuous wall, which can achieve a good seepage prevention effect by matching an extrusion steel piece and a rubber water stop strip; and the structure is simple.
The technical scheme of the invention is as follows: an underground diaphragm wall joint water seepage prevention structure, comprising: h-shaped steel, a rubber water stop strip and an extrusion steel piece;
the H-shaped steel comprises two parallel steel plates A and a steel plate B vertically connecting the two steel plates A; the steel plates B are vertically arranged between the butt joint surfaces of the two pairs of underground diaphragm walls, and the two steel plates A are respectively positioned on the outer sides of two side surfaces in the thickness direction of the underground diaphragm walls;
the extruded steel piece is vertically arranged in the subsequent groove section of the diaphragm wall and is positioned between the two steel plates A of the H-shaped steel; the extrusion steel part is connected with the ground wall reinforcement cage, is in sliding fit with the ground wall reinforcement cage, and can horizontally slide along the direction towards the H-shaped steel;
rubber water stop bars are arranged on the inner sides of the two steel plates A of the H-shaped steel facing the subsequent groove section of the diaphragm wall, and the rubber water stop bars are fixed on the inner sides of the steel plates A;
the extrusion steel piece has two extrusion ends, works as the extrusion steel piece orientation when the direction horizontal slip of H shaped steel, two extrusion ends extrude the inboard rubber sealing strip of two steel sheet A respectively.
On the basis of the scheme, the extrusion steel part is further provided with a steel plate C arranged along the thickness direction of the diaphragm wall, and two ends of the steel plate C are provided with steel plates D which extend towards the H-shaped steel and are inclined inwards and are used as extrusion ends; the two ends of the steel plate C are also provided with a steel plate E extending towards the subsequent groove section of the diaphragm wall, and the steel plate E is used as a back end and is used for being in sliding connection with a diaphragm wall reinforcement cage;
the rubber water stop strip is positioned between the steel plate D and the steel plate A on the corresponding side.
On the basis of the scheme, further, the H-shaped steel is of an asymmetric structure, the two steel plates A are located on two sides of the steel plate B and are different in length, and the length of the two steel plates A towards the subsequent groove section of the diaphragm wall is longer.
On the basis of the scheme, further, the length of the part, facing the subsequent groove section of the diaphragm wall, of the two steel plates A in the H-shaped steel is more than 500mm.
On the basis of the scheme, a joint grouting guide pipe is further arranged between the two steel plates A in the H-shaped steel and the subsequent groove section part facing the diaphragm wall and used for pouring concrete at the joint, and the grouting guide pipe is upwards pulled out along with the pouring of the concrete.
On the basis of the scheme, further, concrete poured at the joint is micro-expansion waterproof concrete, and after the micro-expansion waterproof concrete is poured, the rubber water stop strip is extruded again.
In addition, the invention provides the underground continuous wall, and the joint of two adjacent underground continuous walls is provided with the anti-seepage structure.
In addition, the invention also provides a construction method of the underground diaphragm wall joint seepage-proofing structure, after the construction of the prior groove section of the underground diaphragm wall is finished, the underground diaphragm wall reinforcement cage connected with the H-shaped steel and the extrusion steel is hung in the groove, and the outer side of the H-shaped steel is filled with sandbags; then extruding the extrusion steel piece to the H-shaped steel;
the concrete in the diaphragm wall is poured firstly, so that the extruded steel part fully and continuously extrudes the rubber water stop strip, and then the concrete in the middle of the extruded steel part and the H-shaped steel is poured.
On the basis of the scheme, the liquid level of concrete between the extruded steel piece and the H-shaped steel is always lower than that of concrete in the diaphragm wall.
Has the advantages that:
(1) According to the invention, the extrusion steel part is used for extruding the rubber water stop strip, so that the joint of the underground diaphragm wall can achieve a good seepage-proofing effect, and the phenomena of water seepage, sand flowing and the like of the underground diaphragm wall joint can be effectively improved.
(2) According to the invention, the micro-expansion waterproof concrete is poured at the joint, and the rubber water stop strip is extruded again after the micro-expansion waterproof concrete is poured, so that the water stop effect of the joint part can be improved.
(3) The long end of the H-shaped steel is larger than 500mm, so that the extrusion steel part and the rubber water stop strip are in full area contact, and the pouring of later-stage concrete materials is facilitated.
(4) The extrusion steel part is connected with the ground wall steel reinforcement cage but is in sliding fit, can horizontally and freely move along the width direction of the ground wall, can ensure reliable extrusion of the rubber water stop strip, and is convenient to construct.
(5) During construction, the liquid level of the micro-expansion waterproof concrete at the joint part is always lower than that of the waterproof concrete in the diaphragm wall, so that pressure difference is formed, the extrusion effect of the rubber water stop strip is further ensured, and the seepage-proofing performance is improved.
Drawings
FIG. 1 is a schematic view (top view) of a diaphragm wall joint watertight structure according to the present invention;
fig. 2 is a partially enlarged view of fig. 1.
Wherein: the concrete comprises 1-ground wall-connected reinforcement cage, 2-ground wall-connected grouting guide pipe, 3-joint grouting guide pipe, 4-H-shaped steel, 5-rubber water stop strip, 6-extruded steel piece, 7-waterproof concrete, 8-micro-expansion waterproof concrete, 41-steel plate A, 42-steel plate B, 61-steel plate C, 62-steel plate D and 63-steel plate E.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
the embodiment provides a continuous underground wall seam prevention of seepage water structure, can effectively improve the continuous underground wall and connect phenomenons such as infiltration, quicksand through the setting of extrusion steel spare and rubber sealing rod.
As shown in fig. 1 and 2, the diaphragm wall joint watertight structure is arranged at the joint of two pairs of diaphragm walls, and is used as a joint of the diaphragm walls for connecting two adjacent pairs of diaphragm walls.
This underground continuous wall seam prevention of seepage water structure includes: the joint grouting guide pipe comprises a joint grouting guide pipe 3, H-shaped steel 4, a rubber water stop strip 5, an extrusion steel piece 6 and micro-expansion waterproof concrete 8.
In this example, the thickness of the diaphragm wall (abbreviated as underground diaphragm wall) is 1000mm, the depth is 43m, and the width of each diaphragm wall is 6000mm; the total width of the guide wall (not shown in the figure) is 3000mm, the width of the interior of the foundation pit is 1000mm, the depth of the interior of the foundation pit is 2000mm, and C30 waterproof concrete is poured.
The vertical dimensions of the H-shaped steel 4, the rubber water stop 5 and the extrusion steel part 6 are consistent with the depth of the diaphragm wall.
The H-shaped steel 4 is welded H-shaped steel and comprises two parallel steel plates A41 and a steel plate B42 which is vertically connected (welded) with the two steel plates A41; the steel plate B42 and the two steel plates A41 are vertically arranged; the steel plate B42 is positioned between the butt joint surfaces of the two pairs of the diaphragm walls, namely the butt joint surfaces of the two pairs of the diaphragm walls are respectively abutted against the two side surfaces of the steel plate B42, and the two steel plates A41 are respectively positioned on the outer sides of the two side surfaces in the thickness direction of the diaphragm walls and are abutted against the side surfaces of the corresponding sides of the diaphragm walls.
The H-shaped steel 4 is of an asymmetric structure, the lengths (the size along the width direction of the diaphragm wall) of the H-shaped steel 4 at the two sides of the steel plate B42 are different, and the lengths are respectively a long end and a short end; for convenience of description, two adjacent underground diaphragm walls are respectively an underground diaphragm wall A and an underground diaphragm wall B, wherein the underground diaphragm wall A is a prior groove section, and the underground diaphragm wall B is a subsequent groove section. Taking fig. 1 and fig. 2 as an example, the right end of the underground diaphragm wall a is connected with the left end of the underground diaphragm wall B through the water seepage-proof structure, the long end of the steel plate a41 is located at the side of the underground diaphragm wall B, and the long end needs to be larger than 500mm, so that the extruded steel piece 6 and the rubber water stop strip 5 can be in full area contact, and the pouring of a later concrete material (micro-expansion waterproof concrete 8) is facilitated; in this example, the steel plates A41 of the H-section 4 have a long end dimension of 500mm and a short end dimension of 200mm (i.e., the total dimension of the steel plates A41 in the width direction of the diaphragm wall is 700 mm), and the thickness of each steel plate of the H-section 4 is 10mm.
The vertical setting of extrusion steel 6 is on the right side of H shaped steel 4, and extrusion steel 6 links to each other with ground even wall steel reinforcement cage 1, nevertheless links to each other with ground even wall steel reinforcement cage 1 sliding fit on the width direction of wall, can follow the horizontal free movement of the width direction of ground even wall. In addition, the H-shaped steel 4 is welded with the underground diaphragm wall reinforcement cage 1.
The extrusion steel member 6 has a steel plate C61 provided in the thickness direction of the diaphragm wall, and both ends of the steel plate C61 (both ends in the thickness direction of the diaphragm wall) have inclined steel plates D62 extending leftward and inward as extrusion ends; in addition, two ends of the rear side surface of the steel plate C61 are provided with steel plates E63 which horizontally extend rightwards (along the width direction of the diaphragm wall) and are used as back ends for being connected with the diaphragm wall reinforcement cage 1; the width of the steel plate C61 in the extruded steel part 6 is 3-5 mm less than the inner width of the flange of the H-shaped steel 4 (namely the distance between the two steel plates B42), and the extruded steel part is used for installing the rubber water stop strip 5. In this example, the width of the steel plate C61 in the extruded steel member 6 is 975mm, the length of the extrusion end (i.e., the length of the steel plate D62) is 350mm, the length of the back end (i.e., the length of the steel plate E63) is 200mm, and the thickness of each steel plate in the extruded steel member 6 is 3mm.
The diameter of the rubber water stop strips 5 is 50mm, and the two rubber water stop strips 5 are vertically glued on the inner sides of the long ends of the two steel plates B42 in the H-shaped steel 4 respectively; namely, the rubber water stop 5 is positioned between the long end of the steel plate A41 of the H-shaped steel 4 and the steel plate D62 of the extruded steel part 6; thereby, when the pressing steel member 6 moves toward the H-section steel 4, the rubber seal 5 can be pressed. The rubber water stop strip 5 has certain extrusion resistance strength, and the phenomenon of tearing in the extrusion process of the extrusion steel piece 6 is prevented.
A joint grouting guide pipe 3 is arranged between the long ends of the two steel plates A41 and used for pouring concrete at the joint, and the joint grouting guide pipe 3 is upwards pulled out along with the pouring of the concrete; and a diaphragm wall grouting guide pipe 2 is arranged in the single diaphragm wall and is used for pouring concrete at the diaphragm wall. After the diaphragm wall reinforcement cage 1 is placed in the groove pit (the H-shaped steel 4 and the extrusion steel part 6 are placed along with the diaphragm wall reinforcement cage 1), the extrusion steel part 6 is extruded towards the H-shaped steel 4 by using a tool, so that the rubber water stop strips 6 on two sides of the extrusion end are fully extruded, and a primary water stop function is achieved; then, pouring waterproof concrete 7 and micro-expansion waterproof concrete 8 to the diaphragm wall body and the joint area (namely the area surrounded by the H-shaped steel 4 and the extruded steel 6) through the joint grouting guide pipe 2 and the grouting guide pipe 3 respectively; after the micro-expansion waterproof concrete 8 is poured, the micro-expansion waterproof concrete 8 has a certain extrusion function on the rubber water stop strip 6, so that the joint part achieves a final water stopping effect under the action of the micro-expansion waterproof concrete 8 and the rubber water stop strip 6.
Example 2:
the embodiment provides a construction method of an underground diaphragm wall with the anti-seepage structure, which comprises the following steps:
s1: pouring a guide wall:
the section of the guide wall adopts inverted L-shaped cast-in-place reinforced concrete, HRB400 phi 16@200 steel reinforcement frameworks are uniformly distributed, C35 concrete is used for the guide wall, and the construction is strictly carried out according to the procedures of site leveling, measurement lofting, guide wall excavation, steel reinforcement binding and formwork supporting, concrete pouring, formwork stripping, cross bracing adding and backfilling.
S2: preparing slurry:
the slurry is used for protecting walls, carrying slag and cooling machines in the process of soil body excavation, the slurry with good performance is the key of groove wall stability, plays an extremely important role in the quality of concrete pouring, and the slurry mixing proportion design is carried out according to the geological and underground water properties and the regional construction experience, so that the index of the configured slurry meets the construction requirement. Adding water to a stirring cylinder for 1/3, starting a pulping machine, continuously adding water and bentonite powder, stirring for 15min, adding additives such as alkali powder, stirring for 10min, stopping stirring, placing into a new pulp tank, standing and puffing for 24h, and using;
s3: excavating a groove section in the phase I:
in order to accurately control parameters such as verticality and slurry in the grooving process and guide construction, a first-opened groove is used as a test groove section, grooving data are collected, and construction parameters are adjusted correspondingly; the subsequent groove section is a standard groove, and excavation operation is carried out by adopting a trenching machine according to a design drawing; and (4) checking and accepting the slotted holes according to relevant specifications after the slotted holes are formed.
S4: manufacturing a ground-connected wall reinforcement cage 1: according to the design drawing preparation ground even wall steel reinforcement cage 1 to link together extrusion steel 6 and ground even wall steel reinforcement cage 1 in the settlement position, and make extrusion steel 6 can follow the free dislocation of ground even wall steel reinforcement cage 1 level.
S5: after the groove cleaning is finished, the groove forming quality and the slurry index are checked, the ground wall reinforcement cage 1 connected with the extrusion steel part 6 is hung, and the outer side of the H-shaped steel 4 is filled with a sand bag to prevent the outflow of the poured concrete.
S6: and extruding the extrusion steel piece 6 to the I-stage groove section H-shaped steel 4 by using a tool to fully extrude the rubber water stop strip 6.
S7: pouring concrete: the concrete in the diaphragm wall is poured firstly (namely the waterproof concrete 7 is poured through the diaphragm wall grouting guide pipe 2 firstly), then the micro-expansion waterproof concrete 8 at the middle parts of the extrusion steel part 6 and the H-shaped steel 4 is poured through the connector grouting guide pipe 3, and the liquid level of the micro-expansion waterproof concrete 8 at the parts of the extrusion steel part 6 and the H-shaped steel 4 is always lower than that of the waterproof concrete 7 in the diaphragm wall, so that pressure difference is formed, and the extrusion of the rubber water stop strip 6 is further ensured.
S8: and sequentially pouring the rest underground continuous walls according to the steps until the pouring of the last underground continuous wall is finished.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. Underground continuous wall seam prevention of seepage water structure, its characterized in that includes: h-shaped steel, a rubber water stop bar and an extrusion steel part;
the H-shaped steel comprises two parallel steel plates A and a steel plate B vertically connecting the two steel plates A; the steel plates B are vertically arranged between the butt joint surfaces of the two pairs of underground diaphragm walls, and the two steel plates A are respectively positioned on the outer sides of two side surfaces in the thickness direction of the underground diaphragm walls;
the extruded steel piece is vertically arranged in the subsequent groove section of the diaphragm wall and is positioned between the two steel plates A of the H-shaped steel; the extrusion steel part is connected with the ground wall reinforcement cage, is in sliding fit with the ground wall reinforcement cage, and can horizontally slide along the direction towards the H-shaped steel;
rubber water stop bars are arranged on the inner sides of the two steel plates A of the H-shaped steel facing the subsequent groove section of the diaphragm wall, and the rubber water stop bars are fixed on the inner sides of the steel plates A;
the extrusion steel piece has two extrusion ends, works as the extrusion steel piece orientation when the direction horizontal slip of H shaped steel, two extrusion ends extrude the inboard rubber sealing rod of two steel sheet A respectively.
2. The underground diaphragm wall joint water seepage prevention structure as claimed in claim 1, wherein the extrusion steel member has a steel plate C disposed in a thickness direction of the underground diaphragm wall, and both ends of the steel plate C have steel plates D extending toward the H-shaped steel and inclined inward as extrusion ends; the two ends of the steel plate C are also provided with a steel plate E extending towards the subsequent groove section of the diaphragm wall as back ends for being in sliding connection with the diaphragm wall reinforcement cage;
the rubber water stop strip is positioned between the steel plate D and the steel plate A on the corresponding side.
3. The underground continuous wall joint water seepage prevention structure as claimed in claim 1 or 2, wherein the H-shaped steel is in an asymmetric structure, two steel plates A are positioned on two sides of the steel plate B and have different lengths, and the lengths of the two steel plates A facing the subsequent groove section of the diaphragm wall are longer.
4. The underground continuous wall joint water seepage prevention structure as claimed in claim 3, wherein the length of the two steel plates A in the H-shaped steel towards the subsequent groove section of the underground continuous wall is more than 500mm.
5. The underground continuous wall joint water seepage prevention structure as claimed in claim 1 or 2, wherein joint grouting guide pipes are arranged at positions between two steel plates A facing the subsequent groove section parts of the underground continuous wall in the H-shaped steel for pouring concrete at the joints, and the grouting guide pipes are pulled upwards along with the pouring of the concrete.
6. The underground continuous wall joint water seepage prevention structure as defined by claim 5, wherein the concrete poured at the joint is micro-expansion waterproof concrete, and after the micro-expansion waterproof concrete is poured, the rubber water stop strip is squeezed again.
7. Underground continuous wall, characterized in that the joint of two adjacent underground continuous walls is provided with the seepage control structure of any one of the above claims 1-6.
8. The construction method of the underground continuous wall joint water seepage prevention structure is characterized in that the underground continuous wall joint water seepage prevention structure is the water seepage prevention structure of any one of the claims 1 to 6;
after the construction of the prior groove section of the underground continuous wall is finished, a ground wall reinforcement cage connected with H-shaped steel and extruded steel pieces is hung in the groove, and sand bags are filled outside the H-shaped steel; then extruding the extruded steel piece to the H-shaped steel;
the concrete in the diaphragm wall is poured firstly, so that the extruded steel part fully and continuously extrudes the rubber water stop strip, and then the concrete in the middle of the extruded steel part and the H-shaped steel is poured.
9. The method for constructing a diaphragm wall joint watertight structure according to claim 8, wherein the concrete level in the portion between the extruded steel member and the H-shaped steel member is always lower than the concrete level in the diaphragm wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210938262.7A CN115341552A (en) | 2022-08-05 | 2022-08-05 | Underground continuous wall joint water seepage prevention structure, underground continuous wall and construction method |
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| CN202210938262.7A CN115341552A (en) | 2022-08-05 | 2022-08-05 | Underground continuous wall joint water seepage prevention structure, underground continuous wall and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117802971A (en) * | 2024-01-03 | 2024-04-02 | 广州地铁设计研究院股份有限公司 | Anti-winding structure for underground wall joint and construction method thereof |
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2022
- 2022-08-05 CN CN202210938262.7A patent/CN115341552A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117802971A (en) * | 2024-01-03 | 2024-04-02 | 广州地铁设计研究院股份有限公司 | Anti-winding structure for underground wall joint and construction method thereof |
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