CN208136903U - A kind of precast prestressed formula diaphram wall - Google Patents

Abstract

The utility model relates to a prefabricated prestressed underground diaphragm wall. The underground diaphragm wall comprises left and right prefabricated prestressed underground diaphragm wall components. Convex connecting end, the left end of the horizontal steel bar of the prefabricated prestressed underground diaphragm wall component is the second convex connecting end, and the straight steel bar section of the first convex connecting end is outside the bent steel bar section of the second convex connecting end , the adjacent sides of the left prefabricated prestressed underground diaphragm wall component and the right prefabricated prestressed underground diaphragm wall component are filled with the first convex connection end, the second convex connection end and the left and right prefabricated prestressed The adjacent sides of the underground diaphragm wall members are consolidated into a cast-in-place concrete body of a monolithic structure. The utility model solves the problem that two adjacent underground continuous wall components are not easily connected in the prior art, and at the same time improves the strength and impermeability of the street.

Description

A prefabricated prestressed underground continuous wall

technical field

The utility model relates to a prefabricated prestressed underground continuous wall in the field of construction engineering.

Background technique

The underground diaphragm wall is mainly cast-in-place. The main construction steps of the traditional cast-in-place underground diaphragm wall are: firstly use professional trough-forming equipment to excavate the trough section, make the reinforcement cage after the trough is formed, then lift and lower the reinforcement cage, underwater Concrete is being poured and pile heads are being chiseled out. According to this step, the construction of one piece of ground connection wall is completed, and each piece of ground connection wall repeats the above steps. In the face of large-scale engineering construction, the traditional ground-to-wall structure has already encountered disadvantages such as high construction risk, high consumable materials, and high construction cost.

The prefabricated prestressed underground diaphragm wall is a good solution to the disadvantages of cast-in-place diaphragm walls. The existing prefabricated prestressed underground diaphragm wall is "a prefabricated pre-tensioned prestressed underground diaphragm wall" disclosed in Chinese patent CN205804324U. The underground diaphragm wall is assembled on site by several prefabricated pretensioned prestressed underground diaphragm wall components. Diaphragm wall components are divided along the height direction of prefabricated, pre-tensioned and prestressed underground continuous components, an area with high tension and two areas with low tension or compression located on both sides of the area with large tension, and pre-tensioned steel bars along the underground continuous wall components The height direction of the whole length is arranged, that is to say, the pre-tensioned steel bars are arranged vertically, and the two ends of the pre-tensioned steel bars are respectively pierced in the corresponding embedded casings. The length of the prefabricated pre-tensioned prestressed underground diaphragm wall component along the height direction of the prefabricated pre-tensioned prestressed underground diaphragm wall is the same in the area of small tension or compression, and the prestressed tension is only carried out on the part of the pre-tensioned steel bar located in the area of large tension.

In the existing underground diaphragm wall, pre-tensioned steel bars are arranged in the entire length of the ground connection wall components but not stretched over the entire length, and prestress is only applied in areas with large tension, which is conducive to the support of the ground connection wall as a maintenance structure. Under the complex environmental working conditions of the basement floor, the prestressing effect is more favorable. The ground connection wall components used in the prefabricated pre-tensioned prestressed ground connection wall are assembled on site, which not only saves materials, but also greatly saves labor costs. However, there are still the following problems: although the pre-tensioned steel bars are not stretched at full length, they need to be installed at the full length, resulting in a certain waste of pre-tensioned steel bars. In addition, the pre-tensioned steel bars generate vertical tension on the wall. In actual use, the direction of the load on the wall is mostly in the horizontal direction, and the pre-tensioned steel bars arranged in a vertical line cannot effectively resist the load in the horizontal direction. The overall tensile strength of the wall is not strong, and the wall The ductility before breaking the ring is not good; in addition, the adjacent sides of the two underground diaphragm wall components are flat, and the two underground diaphragm wall components are not easy to connect together, and the joints between the two underground diaphragm wall components are connected The strength is not enough, and the impermeability and sealing are not good.

Utility model content

The purpose of the utility model is to provide a prefabricated prestressed underground diaphragm wall to solve the problem of difficult connection between two adjacent underground diaphragm wall components in the prior art.

In order to solve the above technical problems, the technical scheme of the prefabricated prestressed underground diaphragm wall in the utility model:

A prefabricated prestressed underground diaphragm wall, comprising at least two prefabricated prestressed underground diaphragm wall components arranged in sequence from left to right, each prefabricated prestressed underground diaphragm wall component includes a wall whose thickness extends along the front and rear directions, and the wall body includes The reinforcement cage and the prefabricated concrete body consolidated with the reinforcement cage into an integral structure. The reinforcement cage includes horizontal reinforcement and vertical reinforcement arranged crosswise, and defines the prefabricated prestressing position on the left among two adjacent prefabricated prestressed underground diaphragm wall components. The left prefabricated prestressed underground diaphragm wall component is the left prefabricated prestressed underground diaphragm wall component, and the prefabricated prestressed underground diaphragm wall component on the right is the right prefabricated prestressed underground diaphragm wall component. The right end of the steel bar is the first convex connection end of the prefabricated concrete body of the left prefabricated prestressed underground diaphragm wall component, and the left end of the transverse steel bar of the right prefabricated prestressed underground diaphragm wall component is protruded outwards from the right prefabricated prestressed underground diaphragm wall component. The second convex connection end of the prefabricated concrete body of the diaphragm wall component, the first convex connection end and the second convex connection end are staggered in the horizontal direction, the left prefabricated prestressed underground diaphragm wall component, the right prefabricated prestressed underground diaphragm Adjacent sides of the diaphragm wall components are filled with cast-in-place cast-in-place components that are consolidated into an integral structure with the adjacent sides of the first protruding connecting end, the second protruding connecting end, and the left and right prefabricated prestressed underground diaphragm wall components. concrete body.

The adjacent sides of the left prefabricated prestressed underground diaphragm wall component and the right prefabricated prestressed underground diaphragm wall component have connection recesses opposite to the notches.

Both sides of the prefabricated concrete body in the thickness direction are provided with the transverse steel bars, the first protruding connecting end is a straight steel bar section extending in the left and right directions, and the two second steel bars on both sides of the right prefabricated prestressed underground diaphragm wall member in the thickness direction The two outwardly protruding connecting ends are bent steel bar segments facing oppositely bent, the bent steel bar segment is located inside the straight steel bar segment, and the end of the straight steel bar segment is connected with the bending starting point of the bent steel bar segment.

The two second convex connection ends on both sides in the thickness direction of the right prefabricated prestressed underground diaphragm wall member are arranged in a figure-eight shape.

The cast-in-place concrete body is also provided with a steel bar frame of the overall structure, and the second convex connection end is fixedly connected with the steel bar frame.

The prefabricated concrete body is provided with a hollow through hole penetrating the prefabricated concrete body along the up and down direction.

The wall is provided with at least two prestressed steel bars arranged at intervals along the left and right directions. The upper and lower ends of the prestressed steel bars are respectively fixed by the anchor structure of the upper prestressed steel bar and the lower end of the prestressed steel bar. An arc-shaped structure bent in the thickness direction of the body.

The same side of the wall is provided with an upper installation hole for the installation of the upper prestressed steel anchor structure and a lower installation hole for the installation of the lower prestressed steel anchor structure. The upper installation hole is gradually moving away from the arc from bottom to top. The oblique hole extends obliquely toward the arc top of the structure, and the lower mounting hole is an oblique hole extending obliquely away from the arc top of the arc structure from top to bottom.

The beneficial effects of the utility model are as follows: in the utility model, the left and right prefabricated prestressed underground diaphragm wall components are all prefabricated in the factory. When performing pouring connection and lowering the right prefabricated prestressed underground diaphragm wall component, since the first protruding connecting end is staggered with the second protruding connecting end in the vertical direction, the first protruding connecting end will not interfere with the second protruding connecting end. At the convex connection end, the two prefabricated prestressed underground diaphragm wall components can be placed closer to avoid the problem that the strength of the cast-in-place concrete body is too wide and the strength is affected. The first convex connection end of the left prefabricated prestressed underground diaphragm wall component and The second protruding connecting end of the right prefabricated prestressed underground diaphragm wall member is used to form the steel skeleton of the cast-in-place concrete body, thereby ensuring the overall strength of the cast-in-place concrete body, thereby ensuring the connection strength between the two underground diaphragm wall members .

Description of drawings

Fig. 1 is the structural representation of an embodiment of the prefabricated prestressed underground continuous wall in the utility model;

Fig. 2 is the structural representation of the prefabricated prestressed underground diaphragm wall member in Fig. 1;

Fig. 3 is A-A to sectional view among Fig. 2;

Fig. 4 is the B-B direction sectional view in Fig. 2;

Fig. 5 is a schematic diagram of the arrangement of prestressed steel bars at position C-C in Fig. 2;

FIG. 6 is an enlarged view of D in FIG. 5 .

Detailed ways

An embodiment of a prefabricated prestressed underground diaphragm wall is shown in Figures 1 to 6: it includes at least two prefabricated prestressed underground diaphragm wall components 23 arranged sequentially from left to right, defining two adjacent prefabricated prestressed underground diaphragm wall components The prefabricated prestressed underground diaphragm wall component on the left in the center is the left prefabricated prestressed underground diaphragm wall component, and the prefabricated prestressed underground diaphragm wall component on the right is the right prefabricated prestressed underground diaphragm wall component. The prefabricated prestressed underground diaphragm wall component includes a wall whose thickness extends along the horizontal direction. The wall includes a reinforcement cage and fiber concrete 1 consolidated with the reinforcement cage to form an integral structure. The reinforcement cage includes two walls located on both sides of the wall thickness. A row of full-length vertical reinforcement bars 3 and a horizontal reinforcement bar 4 connected to the corresponding vertical reinforcement bars. The left end of the horizontal reinforcement bars 4 is bent toward the opposite side to form a figure-eight structure 6. The right end of the horizontal reinforcement bars is a straight steel bar segment 7. The figure-eight structure 6 and The straight steel bar sections 7 are all exposed structures, and the exposed structures and corresponding concrete can form a joint 8 together. The straight steel bar sections 7 of the left prefabricated prestressed underground continuous wall components form the first convex connection end, and the right precast prestressed underground continuous wall components The figure-eight structure of the wall component constitutes the second convex connection end, and the heights of the first convex connection end and the second convex connection end are consistent. The wall is provided with a plurality of hollow through holes 2 arranged at intervals along the left and right directions, and each hollow through hole 2 penetrates the wall along the up and down direction. The wall is provided with a plurality of corrugated pipes 5 arranged at intervals along the left and right directions, each corrugated pipe 5 is located between two corresponding hollow through holes, and prestressed steel bars 5 are pierced in each corrugated pipe, because the corrugated pipe is An arc-shaped structure bent along the thickness direction of the wall, so the corresponding prestressed steel bar is also an arc-shaped structure bent along the thickness direction of the wall. On the same side of the body of wall, an upper mounting hole 20 and a lower mounting hole 21 are provided, the upper mounting hole 20 is spaced from the upper end of the wall, the lower mounting hole 21 is spaced from the lower end of the wall, and the upper mounting hole is formed by The oblique hole gradually extends away from the arc top of the arc structure from bottom to top, and the lower installation hole is an oblique hole gradually extending away from the arc top of the arc structure from top to bottom, so that the installation hole and the bellows can be guaranteed The same direction, which is conducive to the penetration of prestressed steel bars, and also has the good tensile stress of prestressed steel bars. The aperture of the upper installation hole gradually becomes smaller from top to bottom, and the aperture of the lower installation hole gradually becomes smaller from bottom to top. The prestressed reinforcement anchorage structure includes an upper anchor plate 14 arranged in the upper mounting hole, and the lower end prestressed reinforcement anchorage structure includes a lower anchor plate arranged in the lower installation hole. The upper anchor plate 14 and the lower anchor plate are arranged obliquely. The two ends of the steel bars are respectively connected with anchor clips 16 for blocking and matching with the corresponding anchor plates, and the inner sides of the upper and lower anchor plates are provided with elastic spiral bars 12, and the upper ends of the prestressed steel bars form tension ends. The lower end of the steel bar forms the anchoring end, and the upper mounting hole and the lower mounting hole are tapered holes, and the prestressed steel bar is anchored by using the tapered hole to cooperate with the wedge and spiral bars of the corresponding anchor plate. The slope of the upper hole wall of the upper mounting hole is greater than the slope of the lower hole wall of the upper mounting hole; the slope of the upper hole wall of the lower mounting hole is greater than the slope of the lower hole wall of the lower mounting hole, which can be more convenient. Prestressed reinforcement for anchoring operations. A grouting hole 10 communicating with the bellows is provided on the wall, and an exhaust hole 11 is provided on the upper anchor plate. The adjacent sides of the left prefabricated prestressed underground diaphragm wall member and the right prefabricated prestressed underground diaphragm wall member are filled with the first protruding connecting end, the second protruding connecting end and the left and right prefabricated prestressing underground continuous wall. Adjacent sides of the wall elements are consolidated into a monolithic cast-in-place concrete body.

The adjacent sides of two adjacent prefabricated prestressed underground diaphragm wall components are provided with connecting recesses 22 extending in the up and down direction opposite to the notches. The recess 22 is fully connected. The prefabrication process of a single prefabricated prestressed underground diaphragm wall component in the factory is as follows: making a reinforcement cage through horizontal steel bars and vertical steel bars, presetting corrugated pipes, reserving hollow circular through holes, and performing fiber concrete pouring, fiber concrete pouring and corrugated concrete After the pipe is poured into the overall structure, the upper and lower mounting holes are also formed. When the concrete strength reaches more than 80% of the design strength, the prestressed steel bars are inserted in the bellows, the prestressed steel bars are applied to the prestressed steel bars, and the prestressed forces are maintained by the cooperation of the spiral bars and the anchor plates with the tapered holes. The grout hole injects grout into the corrugated pipe, and the exhaust hole can ensure that the grout can fully wrap the prestressed steel bar, and pour the anchor concrete into the upper and lower mounting holes to avoid the anchorage from being exposed and rusted, and complete the single prefabricated underground wall component. make. In the utility model, the prestressed steel bars apply stress to the wall body after pouring, so the prefabricated prestressed underground diaphragm wall in the present utility model is also called post-tensioned prefabricated prestressed underground diaphragm wall. The hollow through hole can not only improve the strength of the wall, but also speed up the construction speed. In addition, the hollow through hole can be equipped with circumferential steel bars and connectors, which is suitable for the "two walls in one" underground diaphragm wall. The horizontal steel bars on both sides of the wall and the The vertical reinforcement takes into account the superior structural properties of prestressed concrete and reinforced concrete, which can effectively control the cracks and deflection under the load, and has good ductility before failure. There are exposed steel bars on the adjacent sides of the two prefabricated prestressed underground diaphragm wall components, which fit each other during use, and the anti-seepage micro-expansion concrete joints are poured at the same time, which improves the strength and impermeability of the underground diaphragm wall joints and strengthens the underground diaphragm wall structure. The integrity of the joint, and the sealing effect of the joint is good. In other embodiments of the present utility model: the upper end prestressed steel bar anchorage structure and the lower end prestressed steel bar anchorage structure can also be bolt-fixed structures or welded fixed structures; the number of prefabricated prestressed underground diaphragm wall components can also be three , four or other numbers; the heights of the first protruding connecting end and the second protruding connecting end can also be different.

Embodiment of the construction method of the prefabricated prestressed underground diaphragm wall in the utility model: the method comprises the following steps: the first step: excavating the trench, the trench can be excavated by various techniques, and the hydraulic grab machine can be used to dig the trench , the double-wheel milling machine can also be used to mill the groove, and the row drill type drilling machine can also be used to drill the groove; in the second step, the prefabricated prestressed underground diaphragm wall component is lowered to the ground where the clay curing agent has been mixed with the lifting equipment. In the groove, during the process of lowering the prefabricated prestressed underground diaphragm wall components, the mud containing the clay curing agent enters the hollow through hole of the wall, and the hollow through hole is filled with the mud containing the clay curing agent. After the mud is cured, it can be used as a hollow passage. The permanent filling in the hole, so in the utility model, the hollow through hole can not only reduce the weight of the wall and reduce the amount of concrete used, but also reduce the resistance between the wall and the mud when it is lowered, and at the same time Improve the contact area between the wall and the mud to ensure the connection strength between the wall and the mud; the third step is to hang a prefabricated prestressed underground diaphragm wall component so that the horizontal reinforcement of one of the prefabricated prestressed underground diaphragm wall components The splayed end is located between the straight steel bars of the transverse reinforcement of another prefabricated prestressed underground diaphragm wall component, and the splayed end is lapped and fixed with the corresponding transverse reinforcement. Step 4: To the adjacent two prefabricated prestressed underground continuous Concrete is poured between the wall components, or a connecting reinforcement cage is inserted between two adjacent prefabricated prestressed underground diaphragm wall components, and the protruding transverse reinforcement of each prefabricated prestressed underground diaphragm wall component is fixed to the connecting reinforcement cage in the rear. Concrete is poured between two adjacent prefabricated prestressed underground diaphragm wall components, and after the concrete is cured, a combination between the wall components is formed, and a plurality of prefabricated prestressed underground diaphragm wall components form an integral underground diaphragm wall. In other embodiments of the present invention, the first step of trenching may not be a part of the construction method. There are already trenches on the construction site, and the prefabricated prestressed underground diaphragm wall components can be directly lowered during use.

Claims (8)

1. precast prestressed formula diaphram wall, the precast prestressed formula underground including at least two or so sequence arrangements is continuous Wall member, each precast prestressed formula diaphram wall component include the wall that thickness extends along the longitudinal direction, and wall includes steel Muscle cage and the integrally-built concrete soil body is consolidated into steel reinforcement cage, it is characterised in that：Steel reinforcement cage includes the cross of arranged crosswise To reinforcing bar and vertical reinforcement, position keeps left precast prestressed in the two neighboring precast prestressed formula diaphram wall component of definition Formula diaphram wall component is left precast prestressed formula diaphram wall component, and the precast prestressed formula underground that position is kept right is continuous Wall member is right precast prestressed formula diaphram wall component, and the transverse steel of left precast prestressed formula diaphram wall component is right End is the first evagination connecting pin for externally protruding out in the concrete soil body of left precast prestressed formula diaphram wall component, right prefabricated pre- The transverse steel left end of stress-type diaphram wall component is externally protrude out in right precast prestressed formula diaphram wall component prefabricated Second evagination connecting pin of concrete bodies, the first evagination connecting pin are staggeredly arranged in above-below direction with the second evagination connecting pin, left Precast prestressed formula diaphram wall component, right precast prestressed formula diaphram wall component sides adjacent between be filled with and described the The sides adjacent of one evagination connecting pin, the second evagination connecting pin and left and right precast prestressed formula diaphram wall component is consolidated into whole The cast-in-place concrete body of body structure.

2. precast prestressed formula diaphram wall according to claim 1, it is characterised in that：Left precast prestressed formula underground Continuously coupling recess portion opposite with recess in the adjacent side of wall member, right precast prestressed formula diaphram wall component, even It connects recess portion to vertically extend, cast-in-place concrete body fills up the coupling recess portion.

3. precast prestressed formula diaphram wall according to claim 1, it is characterised in that：The thickness of the concrete soil body The two sides in direction are provided with the transverse steel, and the first evagination connecting pin is the straight lengths of rebar extended in left-right direction, right pre- Two the second evagination connecting pins of pre-stress type diaphram wall component thickness direction two sides processed are the bending towards opposite bending Lengths of rebar, bending reinforcing steel bar section are located at the inside of straight lengths of rebar, and the end of straight lengths of rebar is connected with the bending starting point of bending reinforcing steel bar section.

4. precast prestressed formula diaphram wall according to claim 3, it is characterised in that：Right precast prestressed formula underground Two the second evagination connecting pins of diaphragm wall component thickness direction two sides are arranged in splayed.

5. precast prestressed formula diaphram wall according to claim 3, it is characterised in that：It is also set in cast-in-place concrete body It is equipped with integrally-built reinforced frame, the second evagination connecting pin is fixedly connected with reinforced frame.

6. precast prestressed formula diaphram wall according to claim 1, it is characterised in that：It is arranged in the concrete soil body There is the hollow via-hole for running through the concrete soil body along the vertical direction.

7. precast prestressed formula diaphram wall according to claim 1, it is characterised in that：At least two are provided in wall A deformed bar spaced apart in left-right direction, the upper and lower ends of deformed bar pass through upper end deformed bar anchor respectively Fixing structure and lower end deformed bar anchor structure are fixed, and each deformed bar is along the curved arc knot in thickness of wall body direction Structure.

8. precast prestressed formula diaphram wall according to claim 7, it is characterised in that：It is set on the same side of wall It is equipped with the upper installing hole for upper end deformed bar anchor structure installation and supplies the lower end deformed bar anchor structure Peace holds mounting hole, and upper installing hole is from the bottom to top gradually towards the oblique of the arc top-direction inclination extension far from arcuate structure Hole, lower mounting hole are the inclined hole from top to bottom gradually extended towards the arc top-direction inclination far from arcuate structure.