CN215211057U - H-shaped steel structure for lap joint of underground continuous walls with different thicknesses - Google Patents
H-shaped steel structure for lap joint of underground continuous walls with different thicknesses Download PDFInfo
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- CN215211057U CN215211057U CN202120369093.0U CN202120369093U CN215211057U CN 215211057 U CN215211057 U CN 215211057U CN 202120369093 U CN202120369093 U CN 202120369093U CN 215211057 U CN215211057 U CN 215211057U
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Abstract
The utility model relates to an H-shaped steel structure when underground continuous walls with different thicknesses are lapped, an H-shaped steel interface structure (9) is arranged between a first-stage groove section (2) and a second-stage groove section (3), the H-shaped steel interface structure (9) consists of a flange plate (4), a web plate (5), a transverse steel plate (6) and angle steel (7), flange plates (4) of upper and lower both sides of H shaped steel (9) one end overlap joint on first phase groove section (2), the other end overlap joint is on second phase groove section (3), it has overcome among the prior art underground continuous wall's joint in thickness sudden change department, it is short to wind the underground continuous wall of infiltration route compare isophickness, there is the shortcoming of the hidden danger of hourglass water hourglass sand, it trompil on the web of H shaped steel to have, improves concrete placement quality, thereby reach and improve seam stagnant water effect, ensure the advantage of foundation ditch excavation construction safety.
Description
Technical Field
The utility model relates to the technical field of foundation ditch engineering, more specifically the H shaped steel structure when different thickness underground continuous wall overlap joints.
Background
According to technical code of building foundation pit support JGJ120-2012, the definition of the foundation pit support is as follows: in order to protect the safety of the construction of the underground main body structure and the surrounding environment of the foundation pit, the foundation pit adopts the measures of temporary retaining, reinforcing, protecting and underground water controlling. Whether a supporting structure is adopted for foundation pit excavation or not, which supporting structure is adopted, and the comprehensive analysis and comparison of economy, technology and environment are determined according to the surrounding environment of the foundation pit, the excavation depth of the foundation pit, engineering geological and hydrogeological conditions, construction seasons, regional engineering experience and the like.
In foundation pit engineering with high underground water level, poor stratum conditions and large excavation depth, supporting structures such as cast-in-situ bored piles, secant cast-in-situ piles, underground continuous walls and the like are mostly adopted.
The underground continuous wall is a commonly used supporting structure in foundation pit engineering, under the condition of slurry wall protection, a long and narrow deep groove is dug on the ground, a reinforcement cage is hung after the groove is cleaned, underwater concrete is poured by using a conduit method to form a unit groove section, and the steps are carried out section by section in this way, and a continuous reinforced concrete wall is built underground.
And water-stopping weak belts are formed at the joints of the underwater concrete poured among the unit groove sections in sequence, and various water-stopping structures such as a locking pipe, H-shaped steel, a cross-shaped steel plate and the like can be adopted to improve the water-stopping effect at the joints (as shown in figure 1).
When the H-shaped steel is used as the joint of the underground diaphragm wall, the groundwater is subjected to seepage winding along the perimeter of the inner edge of the H-shaped steel of the second-stage groove section, so that the purpose of water stopping is achieved. The H-shaped steel joint is widely applied to the characteristics of high construction speed, good water stopping effect and the like.
When different geological conditions are located in the foundation pit engineering place or the surrounding environment is changed greatly, underground continuous walls with different thicknesses are required to be adopted for supporting, so that the requirements on rigidity and deformation of different sections of the foundation pit engineering are met, and the engineering construction investment is reduced.
The thickness of the currently common underground continuous wall is 0.6m, 0.8m, 1.0m, 1.2m and 1.5m, and the thickness of the corresponding H-shaped steel is correspondingly adjusted according to the thickness of the underground continuous wall and the arrangement of the reinforcing steel bars.
At present, when H-shaped steel joint underground continuous walls with different thicknesses are adopted for supporting, a thick underground continuous wall is generally constructed firstly, matched large H-shaped steel is synchronously embedded in a primary groove section, and when the thin underground continuous wall is constructed, wall brushing and concrete pouring are carried out on the H-shaped steel. The joints of the underground continuous walls are at the positions with sudden changes of thickness, and the seepage paths are shorter than the underground continuous walls with equal thickness, so that the hidden troubles of water leakage and sand leakage exist, the concrete at the joints of the H-shaped steel is difficult to pour compactly, and the safety of various surrounding building structures and the safety of the foundation pit are easily endangered. (as shown in FIG. 2)
When the excavation depth of the foundation pit engineering is large, the stratum conditions are poor, and the underground water level is high, the joint treatment between the underground continuous walls with different thicknesses is particularly important.
Disclosure of Invention
The utility model aims to overcome the weak point of above-mentioned background art, and the H shaped steel structure when proposing the overlap joint of different thickness underground continuous wall.
The utility model aims at being implemented through the following technical scheme: the H-shaped steel structure for the lap joint of the underground continuous walls with different thicknesses is characterized in that a first-stage groove section and a second-stage groove section with different thicknesses are arranged in the underground continuous walls,
h-shaped steel is arranged between the first-stage groove section and the second-stage groove section and consists of H-shaped steel, a web plate, a transverse steel plate and angle steel,
one end of the flange plates at the upper side and the lower side of the H-shaped steel is lapped on the first-stage groove section, the other end is lapped on the second-stage groove section,
the web of H shaped steel on the welding have horizontal steel sheet, horizontal steel sheet with the web of H shaped steel between add and be equipped with one the angle steel, the angle steel horizontal steel sheet with the web of H shaped steel between the welding link as an organic whole.
In the above technical scheme: the web plate of the H-shaped steel is provided with a row of holes at equal intervals.
In the above technical scheme: the size of the transverse steel plate is consistent with the flange plates on the upper side and the lower side of the H-shaped steel.
In the above technical scheme: the holes are arranged along the depth direction of the H-shaped steel in a full-length mode.
In the above technical scheme: the thickness of the H-shaped steel is 0.6-1.5m-2 multiplied by the thickness of the steel bar protective layer and 2 multiplied by the diameter of the transverse distribution steel bar.
The utility model has the advantages of as follows: 1. the utility model discloses an add one horizontal steel sheet on existing H shaped steel to trompil on the web of H shaped steel improves the concrete placement quality, thereby reaches and improves seam stagnant water effect, ensures foundation ditch excavation construction safety.
2. When the underground engineering excavation depth is large, the stratum condition is poor, and the underground water level is high, water leakage and sand leakage are easy to occur at the joint between the lap joints of the underground continuous walls with different thicknesses, so that the safety of various peripheral building structures and the safety of the foundation pit are endangered. By adopting the novel structure, the construction safety of the foundation pit can be improved.
Drawings
FIG. 1 is a large scale drawing of the joint water stop of the existing joint pipe, H-shaped steel and cross-shaped steel plate.
FIG. 2 is a schematic view of a conventional seepage path of a joint of H-shaped steel with different thicknesses.
FIG. 3 is a cross-sectional view of an H-shaped steel with additional transverse steel plates.
FIG. 4 is a left elevation and a right elevation of the H-shaped steel with the addition of the transverse steel plate.
In the figure: the structure comprises an underground continuous wall 1, a first-stage groove section 2, a second-stage groove section 3, flange plates 4, a web plate 5, transverse steel plates 6, angle steel 7, holes 8 and H-shaped steel 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The thickness of the currently common underground continuous wall 1 is 0.6m, 0.8m, 1.0m, 1.2m and 1.5m, the thickness of the corresponding H-shaped steel 9 is 0.6-1.5m-2 multiplied by the thickness of a steel bar protective layer and 2 multiplied by the diameter of a transverse distribution steel bar, the thickness of the inner protective layer is 70mm, the thickness of the transverse steel bar is 20mm, and the thickness of the H-shaped steel 4 is 500mm, 700mm, 900mm, 1100mm and 1400mm respectively.
The H-shaped steel 9 is made of Q235b steel, and the thickness of a welding seam is 8 mm. The construction process and precision of steel plate welding and the like can meet the requirements of construction and acceptance specifications.
The length of the H-shaped steel 9 is generally adjusted according to the difference of the water head of confined water inside and outside the foundation pit, and the general consideration is given to the aspects of field construction welding, integral rigidity of a reinforcement cage and the like, the common width is 500mm, the reinforcement cage of the first-stage groove section 2 is 200mm in lap joint with the H-shaped steel, and the second-stage groove section 3 is 300mm in lap joint.
The thicknesses of the web plate and the flange plate of the H-shaped steel 9 are convenient for field processing, can be the same, and can be 8-12mm by combining the integral rigidity and the hoisting requirement of the steel reinforcement cage.
The transverse steel plate 6 additionally arranged on the H-shaped steel 9 is a wing plate and is consistent with the size requirements of the flange plates 4 on the upper side and the lower side of the H-shaped steel 9.
In order to increase the overall stability and rigidity of the transverse steel plate 6 during the construction of the second-stage groove section 3, an angle steel 7 is additionally arranged between the transverse steel plate 6 and the web plate, the angle steel 7 and the I-shaped steel are arranged in a full-length mode, and welding rods are used for single-side welding.
In order to facilitate the first-stage groove section 2 to pour concrete, the concrete at the joint of the H-shaped steel 9 can be densely filled to the thickness change part of the underground continuous wall, a row of holes 8 with the size of 100mm multiplied by 100mm is cut at the thickness change part of the H-shaped steel 9, the vertical clear interval of the holes 8 is 200mm, and the holes 8 are arranged along the depth direction of the H-shaped steel 9 in a full-length mode.
The technical parameters of the underground diaphragm wall 1 for grooving are as follows:
firstly, in the process of excavating the groove section of the underground continuous wall 1, the groove is always filled with slurry to keep the groove wall stable.
Secondly, the stability of the groove section excavation is enhanced, and if the groove wall has serious local collapse, the groove section excavation is backfilled in time and properly processed.
Thirdly, slurry leakage during construction can be timely supplemented, and the required liquid level height can be always kept. The quality of the slurry is checked regularly, and the slurry index is adjusted in time.
Fourthly, after the groove section is excavated, the groove position, the groove depth, the groove width and the groove wall verticality are checked, and the groove cleaning and slurry changing work can be carried out after the groove section is qualified.
Controlling the final groove depth of the groove section according to the following requirements: a. the final groove depth of the groove section must ensure the design depth, and in the same groove section, the excavation depth of the groove bottom is consistent and kept flat; b. the excavation depth of the bottom of the underground continuous wall of the lengthened section in the same groove section is consistent with that of the bottom of the first-stage groove section.
Sixthly, the length, the thickness, the gradient and the like of the groove section meet the following requirements: a. the allowable deviation of the length of the groove section is +/-2.0 percent; b. the allowable deviation of the thickness of the groove section is +/-10 mm; c. the allowable deviation of the perpendicularity of the groove section is +/-1/300; d. the local projection of the wall surface is not more than 100 mm; e. the position deviation of the embedded part on the wall surface is not more than 100 mm; f. deviation of the center line of the wall top: less than or equal to 30 mm; g. the areas of the holes, exposed ribs and honeycombs are not more than 5% of the exposed area of the unit groove section; h. the joint of the groove section has no mud inclusion and no water leakage.
And seventhly, cleaning up impurities such as sediments at the bottom of the tank after the tank digging is finished, wherein the specific gravity of the slurry within 500mm of the bottom of the tank is not more than 1.15 and the thickness of the sediments is not more than 100mm after the tank bottom is cleaned and the slurry is replaced for 1 hour.
Referring to FIGS. 3-4: the H-shaped steel structure when the underground continuous walls with different thicknesses are lapped is characterized in that a first-stage groove section 2 and a second-stage groove section 3 with different thicknesses are arranged in the underground continuous wall 1,
h-shaped steel 9 is arranged between the first-stage groove section 2 and the second-stage groove section 3, the H-shaped steel 9 consists of flange plates 4, web plates 5, transverse steel plates 6 and angle steel 7,
one end of the flange plates 4 at the upper side and the lower side of the H-shaped steel 9 is lapped on the first-stage groove section 2, the other end is lapped on the second-stage groove section 3,
the web 4 of H shaped steel 9 on the welding have horizontal steel sheet 6, horizontal steel sheet 6 with the web of H shaped steel 9 between add and be equipped with one angle steel 7, angle steel 7 horizontal steel sheet 6 with the web of H shaped steel 9 between the welding link as an organic whole.
The web plate of the H-shaped steel 9 is provided with a row of holes 8 at equal intervals.
The size of the transverse steel plate 6 is consistent with that of the flange plates 4 on the upper side and the lower side of the H-shaped steel 9.
The holes 8 are arranged along the depth direction of the H-shaped steel 9.
The thickness of the H-shaped steel 9 is 0.6-1.5m-2 multiplied by the thickness of the steel bar protective layer and 2 multiplied by the diameter of the transverse distribution steel bar.
The utility model discloses still include following specific manufacture process:
firstly, manufacturing H-shaped steel: cutting holes 8 with the size of 100 multiplied by 100mm on a common H-shaped steel 9 web plate by a cutting machine, wherein the holes 8 are usually arranged along the height direction of the H-shaped steel 9, and the clear distance between the holes 8 is 200 mm;
welding a transverse steel plate 6: the web plates of the transverse steel plate 6 and the H-shaped steel 9 are firmly welded by adopting angle steel 7 at one side of the hole 8 close to the H-shaped steel 9;
thirdly, constructing the underground continuous wall of the first-stage groove section: the method comprises the following steps of guide wall construction, trenching, slurry wall protection, bottom hole cleaning, joint box lowering, reinforcement cage and concrete pouring.
Fourthly, constructing the underground continuous wall of the second-stage groove section: the construction technical requirements are consistent with the requirements of the first-stage groove section 2, wherein the concrete pouring can be carried out after the initial setting of the concrete of the first-stage groove section 2 and the removal of the joint box.
The above-mentioned parts not described in detail are prior art.
Claims (3)
1. An H-shaped steel structure for lap joint of underground continuous walls with different thicknesses is characterized in that a first-stage groove section (2) and a second-stage groove section (3) with different thicknesses are arranged in an underground continuous wall (1),
the method is characterized in that: h-shaped steel (9) is arranged between the first-stage groove section (2) and the second-stage groove section (3), the H-shaped steel (9) consists of flange plates (4), webs (5), transverse steel plates (6) and angle steel (7),
one end of the flange plates (4) at the upper side and the lower side of the H-shaped steel structure is lapped on the first-stage groove section (2), the other end is lapped on the second-stage groove section (3),
a transverse steel plate (6) is welded on a web plate of the H-shaped steel (9), one layer of angle steel (7) is additionally arranged between the transverse steel plate (6) and the web plate of the H-shaped steel (9), and the angle steel (7), the transverse steel plate (6) and the web plate of the H-shaped steel (9) are welded into a whole; a row of holes (8) are formed in a web plate of the H-shaped steel (9) at equal intervals.
2. The H-shaped steel structure for the lap joint of the underground continuous walls with different thicknesses as claimed in claim 1, wherein: the size of the transverse steel plate (6) is consistent with that of the flange plates (4) on the upper side and the lower side of the H-shaped steel (9); the holes (8) are arranged along the depth direction of the H-shaped steel (9) in a full-length mode.
3. The H-shaped steel structure for the lap joint of the underground continuous walls with different thicknesses as claimed in claim 1, wherein: the thickness of the H-shaped steel (9) is 0.6-1.5m-2 multiplied by the thickness of the steel bar protective layer and 2 multiplied by the diameter of the transverse distribution steel bar.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962619A (en) * | 2021-02-09 | 2021-06-15 | 长江勘测规划设计研究有限责任公司 | H-shaped steel structure for lap joint of underground continuous walls with different thicknesses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962619A (en) * | 2021-02-09 | 2021-06-15 | 长江勘测规划设计研究有限责任公司 | H-shaped steel structure for lap joint of underground continuous walls with different thicknesses |
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