CN213476923U - Embedded pipe truss structure for weir plug body impervious wall construction - Google Patents

Abstract

The utility model discloses a weir plug body cut-off wall construction is with pre-buried tub of truss structure for a plurality of pre-buried pipes in the one deck pre-buried pipe of simultaneous localization just have been established to the slotted hole along with this layer of pre-buried pipe in together, include: the length extension direction of the embedded pipe is parallel to the axial direction of the slotted hole and is used for fixing a main frame of a plurality of embedded pipes and a plurality of positioning frames fixedly connected with the main frame; the positioning frames extend along the width direction of the slotted hole and are in line contact with two side walls of the slotted hole. The utility model discloses a buried pipe truss structure in advance can avoid the probe stone under the damming body stratum condition, and quick, smooth underground is established and is buried pipe in advance and improve the buried pipe survival rate in advance, guarantees under the wall curtain grouting quality.

Description

Embedded pipe truss structure for weir plug body impervious wall construction

Technical Field

The utility model relates to a hydraulic and hydroelectric engineering field especially relates to a weir plug body cut-off wall construction is with pre-buried pipe truss structure.

Background

The damming body is formed by earthquake collapse and landslide, and because the damming lake remediation is in need, the damming body remediation needs to take the working ideas of simultaneous research, simultaneous design and simultaneous remediation, and needs to implement danger removal and flood control projects such as damming body remediation as soon as possible. The damming body renovation is to carry out anti-seepage treatment and partial slope renovation on the damming body, the damming base and the bank slope at two sides, and the damming body anti-seepage treatment adopts the combination of anti-seepage wall and curtain grouting.

For the dam body, the prior treatment engineering experience mainly aims at removing and dredging water flow, but for the dam body with huge volume formed by super-huge collapse, the removal cost is very high, and a proper field is difficult to find near an engineering address for piling so many piled bodies, so if the dam body can be fully utilized, the dam body is directly formed by utilizing the dam body, the harm and the benefit can be removed, and the waste is changed into the valuable.

In the prior art, when the embedded pipe is arranged below, the survival rate of the embedded pipe is very low according to the past construction experience of the impervious wall of a complex stratum, and the method is generally adopted for repairing and grouting holes on a wall, so that not only is the time wasted and the construction cost improved, but also the concrete impervious wall is damaged. For the geological conditions of the weir plug body with large boulder content, large particle size and high hardness, the hole shape is difficult to control and the number of probe stones is large when the impervious wall is grooved, the embedded pipe positioning frame with the traditional outer frame being a rectangular frame is adopted, the hole wall or the probe stones are easy to touch when the embedded pipe positioning frame is arranged below the external frame, so that the embedded pipe cannot be smoothly arranged below the external frame, the unfavorable conditions cause great difficulty for the construction of the impervious wall, great challenge is provided for the prior construction technology, and no construction precedent exists at home and abroad in longitudinal view.

Disclosure of Invention

The utility model aims at overcoming the problem that above-mentioned prior art exists, provide a construction of weir plug body cut-off wall is with pre-buried pipe truss structure, can avoid the probe stone under weir plug body stratum condition, quick, smooth underground is established and is predetermine the buried pipe and improve the pre-buried pipe survival rate, guarantees curtain grout quality under the wall.

In order to realize the above object of the utility model, the utility model discloses a weir plug body cut-off wall construction is with pre-buried tub of truss structure for a plurality of pre-buried pipes in the one deck pre-buried pipe of simultaneous localization just along with this layer of pre-buried pipe in the slotted hole is established together, include: the length extension direction of the embedded pipe is parallel to the axial direction of the slotted hole and is used for fixing a main frame of a plurality of embedded pipes and a plurality of positioning frames fixedly connected with the main frame; the positioning frames extend along the width direction of the slotted hole and are in line contact with two side walls of the slotted hole.

The positioning frames are arranged at intervals along the length direction of the main frame.

Wherein, the locating rack includes: the first positioning frame is fixedly connected with the main frame and extends out of the main frame towards the direction of the side wall of the slotted hole, and the first positioning frame is provided with a first connecting beam in line contact with the side wall of the slotted hole; the second positioning frame is fixedly connected with the main frame and extends out of the main frame towards the other side wall of the slotted hole, and the second positioning frame is provided with a second connecting beam in line contact with one side wall of the slotted hole.

Alternatively, the spacer includes: an upper cantilever beam, one end of which is connected with the upper end of the main frame and extends along the width direction of the slotted hole; one end of the lower suspension beam is connected with the lower end of the main frame and extends along the width direction of the slotted hole; the two ends of the first connecting beam are respectively connected with one end of the upper overhanging beam and one end of the lower overhanging beam and are in line contact with one side wall of the slotted hole; and the two ends of the second connecting beam are respectively connected with the other end of the upper overhanging beam and the other end of the lower overhanging beam and are in line contact with the other side wall of the slotted hole.

The main frame is provided with a plurality of notches for sleeving the plurality of embedded pipes, and the plurality of notches are arranged at intervals along the length direction of the main frame.

Preferably, the positioning frame further comprises: and the reinforcing beam is connected with the main frame at one end and the connecting beam at the other end.

Preferably, the plurality of positioning frames correspond to the plurality of notches on the main frame respectively.

Compared with the prior art, the utility model discloses weir cock body cut-off wall construction has following beneficial effect with pre-buried tub of truss structure:

1. the utility model discloses a structure can surpass 130m, the many damming body geological conditions of boulder content at the maximum depth of cut-off wall and carry out the setting of pre-buried pipe on, establishes the in-process under, effectively avoids influencing the condition that pre-buried pipe truss and pre-buried pipe can't set up because of the outstanding probe stone of slotted hole lateral wall, improves the pre-buried pipe survival rate, guarantees curtain grouting quality under the wall.

2. The utility model discloses a structure becomes "line" with slotted hole lateral wall contact friction orbit in order to carry out the setting and the location of pre-buried pipe, has greatly reduced the touching probability with slotted hole lateral wall and probe stone when pre-buried pipe truss sets up, improves and sets up efficiency.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Drawings

FIG. 1 is a schematic view of a buried pipe disposed below a slotted hole having a relatively small axial length;

fig. 2 is a schematic structural view of the embedded pipe truss of the invention;

fig. 3 is a partial perspective view of the pre-buried pipe truss of the present invention;

fig. 4 is a front view of the main frame of the present invention;

fig. 5 is a perspective view of the main frame of the present invention;

fig. 6 is a left side view of the positioning frame of the present invention;

fig. 7 is a schematic view of the fixing of the embedded pipe on the embedded pipe truss;

fig. 8 is a schematic view of the placement of a buried pipe down a slotted hole of greater axial length.

Detailed Description

The impervious system of the damming body renovation project is the core of the damming lake renovation project reservoir, and consists of a damming body impervious wall, left bank ancient landslide body curtain grouting and right bank bedrock curtain grouting. For the weir plug body with the depth of the impervious wall exceeding 100m, the maximum depth even exceeding 130m, the thickness of the wall exceeding 1.0m, the content of boulders exceeding 50%, the maximum particle size of the boulders exceeding 15 m, the overhead phenomenon being serious, and the geological conditions of non-deposition and cementation of the stratum being extremely complex, in order to ensure the success of the construction of the impervious wall, each link in the construction process must be careful, such as the treatment of the stratum, such as the arrangement of the embedded pipes after the groove forming, and the later pouring. In the process of arranging the embedded pipe under, the condition that the embedded pipe truss and the embedded pipe cannot be arranged under the embedded pipe are effectively avoided due to the protruding probe stones on the side wall of the slotted hole.

For making the buried pipe can set smoothly, the utility model provides a buried pipe truss structure in the buried pipe in advance in the weir cock body cut-off wall construction as follows for a plurality of buried pipes in the one deck buried pipe of simultaneous location just set up the slotted hole along with this layer of buried pipe in advance, include: the length extension direction of the embedded pipe is parallel to the axial direction of the slotted hole and is used for fixing a main frame of a plurality of embedded pipes and a plurality of positioning frames fixedly connected with the main frame; the positioning frames extend along the width direction of the slotted holes and are in line contact with two side walls of the slotted holes respectively, so that the pre-embedded pipe truss arranged in the slotted holes along with the pre-embedded pipes can be prevented from being arranged downwards continuously due to the fact that the pre-embedded pipe truss touches a probe stone on the side walls of the slotted holes.

Particularly, the utility model discloses behind the slotted hole that forms the weir plug body cut-off wall, can carry out the lower setting of pre-buried pipe in the slotted hole. Because the slotted hole degree of depth is very dark (100 meters even more), and every embedded pipe is about 6 meters or 12 meters, consequently need to set up a plurality of embedded pipes one by one and link together until the slotted hole bottom, promptly, regard embedded pipe length as a floor height, set up the embedded pipe in the slotted hole layer by layer, in order to save the time of setting up down, when setting up each layer of embedded pipe, set up a plurality of embedded pipes that are parallel to each other down simultaneously.

When a layer of pre-buried pipes is arranged below, the lower parts of the pre-buried pipes of the layer are arranged in the slotted holes simultaneously, the upper parts of the pre-buried pipes are exposed out of the slotted holes, then the upper parts or the middle upper parts of the pre-buried pipes in the layer of pre-buried pipes are positioned simultaneously through an embedded pipe truss, and then the embedded pipe truss is arranged in the slotted holes together with the layer of pre-buried pipes.

Wherein, the utility model discloses a pre-buried pipe truss 300 adopts as shown in fig. 1, fig. 2 structure, and it includes: a main frame 31 whose length extending direction is parallel to the axial direction of the slotted hole 100 and used for fixing a plurality of embedded pipes 400, and a plurality of positioning frames 32 fixedly connected with the main frame 31. The positioning frames 32 extend along the width direction of the slotted holes and are in line contact with the two side walls of the slotted holes respectively, so that the pre-buried pipe truss arranged in the slotted holes along with the pre-buried pipes can not be arranged downwards continuously due to the fact that the pre-buried pipe truss touches the probe stones on the side walls of the slotted holes.

The main frame 31 has a truss structure, and as shown in fig. 3 to 5, the truss main body 310 is formed by welding a plurality of vertical beams extending in the depth direction of the slot, a plurality of cross beams extending in the axial direction (i.e., the length direction) of the slot, and a plurality of longitudinal beams extending in the width direction of the slot, and in order to enhance the connection strength, a plurality of oblique beams 312 are further welded to the truss main body 310. In order to facilitate the quick arrangement of the embedded pipes in the main frame 31 for positioning the embedded pipes, a plurality of notches 311 for sleeving a plurality of embedded pipes are formed in one side of the truss main body 310, and the notches 311 are arranged at intervals along the length direction of the truss main body 310.

The plurality of spacers 32 are provided at intervals in the longitudinal direction of the main frame 31, and as shown in fig. 2, only two spacers 32 are shown to be attached to both sides of the main frame 31, but in actual use, the plurality of spacers 32 may be attached to the main frame 31 in accordance with the axial length of the slot (as shown in fig. 8). When the plurality of positioning frames 32 are mounted on the main frame 31, the plurality of positioning frames 32 correspond to the plurality of notches 311 of the main frame 31, respectively, so as to reinforce the strength of the notches 311.

The positioning frame 32 may adopt a first structure as shown in fig. 6, which includes: a first positioning frame fixedly connected to the truss main body 310 of the main frame 31 and extending out of the main frame 31 toward one sidewall of the slot, and having a first connection beam in line contact with the one sidewall of the slot; a second positioning frame 324 fixedly connected to the first positioning frame and extending out of the main frame toward the other side wall of the slot hole, and having a second connecting beam in line contact with the one side wall of the slot hole. During manufacturing, the first positioning frame and the second positioning frame 324 can adopt the same structure and are fixedly connected together in a butt welding mode. Each positioning frame comprises an upper overhanging beam 321 extending along the width direction of the slotted hole, a lower overhanging beam 323 extending along the width direction of the slotted hole, and a connecting beam 322 with two ends respectively connected with the upper overhanging beam and the lower overhanging beam, wherein each beam can be fixedly connected together by a plurality of ribbed steel bars in a welding mode or formed by bending one ribbed steel bar.

Alternatively, the positioning frame 32 may also adopt a second structure including: an upper overhanging beam, one end of which is connected with the upper end of the main frame and extends along the width direction of the slotted hole; one end of the lower suspension beam is connected with the lower end of the main frame and extends along the width direction of the slotted hole; a first connecting beam having both ends connected to one end of the upper cantilever beam and one end of the lower cantilever beam, respectively, and in line contact with one sidewall of the slot; and the two ends of the second connecting beam are respectively connected with the other end of the upper overhanging beam and the other end of the lower overhanging beam and are in line contact with the other side wall of the slotted hole. That is, the second structure of the spacer is no longer formed by butt welding the two spacers.

In order to improve the connection strength between the positioning frame 32 and the main frame 31, the embedded pipe truss may further include a reinforcing beam 33 (as shown in fig. 3) having one end connected to the main frame 31 (e.g., a vertical beam at or near the gap) and the other end connected to the connecting beam of the positioning frame 32. In order to make the pre-buried pipe truss and the two side walls of the slot hole form line contact, each connecting beam of the pre-buried pipe truss is an arc-shaped beam (as shown in fig. 7), that is, as seen from the beam surface of the pre-buried pipe truss, the connecting beam extending along the direction of the slot hole is in an arc shape protruding outwards from top to bottom (i.e. towards the direction of the corresponding side wall of the slot hole to be contacted).

When the positioning frame 32 is coupled to the main frame 31, the positioning frame 32 is eccentrically fixed to the main frame 31, that is, a portion of the positioning frame 32 (e.g., a portion near one of the coupling beams) is welded to the positioning frame 32 (as shown in fig. 7), so that another portion of the positioning frame 32 including the other coupling beam is suspended outside the main frame 31. Of course, the relative positions of the positioning frame 32 and the main frame 31 may be determined according to specific situations. When designing, the extension length of the corresponding positioning frame can be determined according to the width of the slot, and the extension length is generally equivalent to the width of the slot.

When the position of the embedded pipe truss is designed, the influence of the positions of a top steel reinforcement cage, the pouring guide pipe 200 and the joint pipe 500 is considered, therefore, the number of the embedded pipes is distributed according to the condition of slotted holes, the distance between the embedded pipes is consistent with the normal hole position distance of the impervious wall slot, if only 3 embedded pipes are needed, the positioning frame of the embedded pipe truss can be arranged at the positions of two holes (shown in figure 1), the supporting position of the positioning frame not only can ensure that the center of the pouring guide pipe meets the standard requirement of a preset distance (such as 1.0-1.5 m) from the pipe wall of the joint pipe, but also can successfully avoid the position of a small wall with more impervious wall probe stones, and ensure the success rate of arrangement.

If the number of the embedded pipes in the slotted holes is large (5 pipes shown in fig. 8), the spacing between each embedded pipe and the right hole of the slotted hole is kept consistent, in order to not affect the arrangement of the lower part of the pouring guide pipe, the supporting position of the positioning frame is consistent with the hole positions on the two sides of the center, and the success rate of the arrangement of the lower part is ensured, as shown in fig. 8.

The pre-buried pipe truss is before the equipment, and the breach that the accessible was reserved is for pre-buried pipe location, makes things convenient for and assembles before the lower equipment in the future. By adopting the structure that the embedded pipe and the embedded pipe truss are separated firstly and then assembled, a large amount of space can be vacated, and enough storage sites can be ensured.

According to the traditional embedded pipe connection, after two embedded pipes are butted, three to four short steel bars are welded and fixed all around, and by adopting the connection mode, the processing speed is low, the stress is not uniform, the lower installation process is easy to break, the sealing performance is poor, and cement slurry is easy to infiltrate into the pouring process to block the pipeline. And adopt the utility model discloses the pre-buried union coupling adopts telescopic connection, greatly improves processing efficiency and processingquality. When in design, the embedded pipe and the sleeve can adopt the following parameters: the length of each embedded pipe is 6m, the outer diameter is 114mm, the inner diameter of the sleeve is 117mm, the length of the sleeve is 30cm, one end of each embedded pipe is embedded into the sleeve by 15cm, the other end of each embedded pipe is embedded after welding, the embedded pipes are firmly welded after being straight, and the embedded pipes are connected into a single pipe with the length of 12, so that the embedded pipes can be conveniently arranged in the future, and the overall arrangement speed is increased.

The embedded pipe adopts Q235 steel, and when will embedded pipe and sleeve welding, will embedded pipe and sleeve pipe all around full weld, under this condition, 2mm welding thickness can satisfy the construction strength requirement.

After the embedded pipes and the embedded pipe trusses are processed in batches, the embedded pipes and the embedded pipe trusses are temporarily in a separated state for convenient on-site storage, and the site space is saved. And before the embedded pipe is arranged below the embedded pipe, performing field processing and assembly. During assembly, the steel bars with the same cross section as the pre-buried pipe trusses are welded, and after assembly, the 12m pre-buried pipes and the pre-buried pipe trusses are integrally arranged, so that the arranging speed is increased.

When the embedded pipe is arranged below, the length of the bottom pipe of the embedded pipe can be 12m (namely the embedded pipe arranged at the bottommost part of the slotted hole), two embedded pipe trusses can be adopted, and the length of a single embedded pipe of the two embedded pipe trusses is processed according to the corresponding hole depth. In order to prevent the pipe bottom of the pre-buried pipe from entering concrete mortar during pouring, the front bottom pipe arranged below the pre-buried pipe is sealed in advance. Can adopt the mesh to seal the bottom tube for 2 mm's wire net, prevent that the mortar from scurrying into simultaneously, can make in the slotted hole bentonite thick liquid admission pipe again, pre-buried tub buoyancy was too big when avoiding setting down, and the influence sets up speed. When the bottom pipe is sealed by the steel wire mesh, 2-3 short steel bars are welded at the bottom of the embedded pipe in advance, and after the bottom pipe is wrapped by the steel wire mesh, the steel wire mesh is bound and fixed firmly by iron wires.

After the layer of embedded pipe bottom pipe is arranged below, I-shaped steel penetrates through the embedded pipe trusses welded and fixed with the layer of bottom pipe respectively to be fixed on the guide wall, the bottom embedded pipe is prevented from falling to the bottom of the hole, and the bottom embedded pipe is fixed to be higher than the top of the slotted hole by a certain distance (about 1.3m) so as to facilitate welding operation of the embedded pipe. And loosening the quick clamping assembly for hoisting the bottom pipes, buckling the top of a corresponding one of the upper-layer embedded pipes to be in butt joint with the one layer of bottom pipes by using the annular buckle of the quick clamping assembly, and hoisting by using a crane. After the sleeves at the tops of the bottom pipes in the lifting heel slot holes are butted, the lower setting verticality is adjusted, and the direction of the parallel wall body and the upstream direction and the downstream direction are vertical through general visual observation. After the vertical adjustment, the upper embedded pipe and the lower embedded pipe are welded into a whole through a sleeve, and then the lower embedded pipe is arranged to the position of the orifice with the height of only about 2 m. At the moment, the plurality of gaps of the embedded pipe truss are respectively aligned with the embedded pipes and pushed into the embedded pipes, and then the embedded pipe truss and the embedded pipes are firmly welded to form a whole. Finally, I-shaped steel is fixed on the guide wall, and a certain height is reserved at the pipe orifice to facilitate welding operation. And then, the same method is continuously adopted for butting the embedded pipes, and when the position, which is about 20 meters away from the slotted hole opening and used for placing the steel reinforcement cage, of the position is met, the upper embedded pipe and the lower embedded pipe which are butted in the upper layer of embedded pipes and the lower layer of embedded pipes are butted through the sleeve in a guiding way, and then the upper embedded pipe is not welded with the sleeve, so that the embedded pipes can axially move, but the upper embedded pipe cannot be separated from the sleeve even if the upper embedded pipe floats upwards along with the steel reinforcement cage due to the certain length of the sleeve in the axial direction, and the survival rate of the embedded pipes after the embedded pipes are.

The mode that the embedded pipes and the positioning frame are separately arranged is adopted, the process is arranged below the embedded pipes, each embedded pipe is independent, when the embedded pipes are in butt joint with the lower embedded pipe sleeve, the bottom of each embedded pipe is not restricted, the horizontal direction and the vertical direction can be freely adjusted, and the butt joint speed is accelerated. The overall setting speed is improved. The embedded pipe is butted with the lower sleeve through self weight, so that the embedded pipe can be kept vertical, and the arrangement quality below the embedded pipe can be ensured.

The utility model discloses a to the improvement of pre-buried pipe truss, the pre-buried pipe has set degree of depth and quality to obtain very big promotion. The positioning frame of the pre-buried pipe truss is arranged in a vertical arc shape, so that the small wall part with more probe stones can be effectively avoided. Meanwhile, the supporting positions of the positioning frame are two single points, compared with a rectangular positioning frame in the prior art, the probability of encountering a probe stone is greatly reduced, and theoretically, the supporting positions of the positioning frame are only 8.3% -16.7% of the rectangular structure. Experiments verify that the setting depth of the embedded pipe can completely meet the design requirement, the setting process is smooth, the phenomenon of blockage in the setting process does not occur on one side, the setting success rate reaches 100%, and the reasonable design of the embedded pipe truss is fully demonstrated.

The internal space of the pre-buried pipe truss is large enough to ensure that the pouring guide pipe is arranged below. And according to the actual condition of arranging the casting guide pipe, the process of arranging the left groove section and the right groove section is smooth, and the condition of arranging the guide pipe under the blockage is not caused. Therefore, the two single-point supporting and positioning frames of the pre-buried pipe truss can meet the positioning requirement.

Through actual engineering verification, after the pre-buried pipe is arranged, the arrangement quality of the pre-buried pipe of each groove section is detected, and through detection of an inclinometer, the maximum vertex angle of the pre-buried pipe is only 0.3 degrees, the maximum deflection rate of the pre-buried pipe is less than 0.2 percent, and the deviation of the hole bottom is not more than 20cm, so that the arrangement quality is guaranteed. And after the pouring is finished, sweeping the holes of the embedded pipes by using a geological drilling machine, wherein the holes are swept to the bottom successfully, no hole forming phenomenon is found, and the survival rate of the embedded pipes reaches 100%.

The utility model discloses a method is set up under pre-buried pipe, has following advantage:

firstly, the utility model discloses the embedded pipe truss adopts two point support modes, compares with traditional rectangular frame locate mode, and material consumption is improved. Use a certain 136m hole deep second phase groove as an example, the utility model discloses an about 2.1t of steel are consumed to pre-buried pipe truss, if adopt traditional mode, need steel 3.0 t. Therefore, compared with the traditional rectangular positioning frame, the steel of the embedded pipe truss after the improved design is saved by about 30%.

In addition, the contact between the traditional rectangular pre-buried pipe truss and the hole wall is a rectangular side, and the scraping and rubbing of mud sheets on the whole surface of the hole wall are generated when the rectangular pre-buried pipe truss is arranged below the hole wall, so that the reduction of the mud sheets is easy to increase the probability of the collapse accident of the slotted hole, and the scraping and rubbing mud sheets form siltation at the hole bottom to cause adverse effects on secondary hole cleaning. The utility model discloses a pre-buried pipe truss, it adopts some support orientation mode, and the local from the drill way to the hole bottom of pore wall contact in the slotted hole only is two straight lines when setting down, has greatly reduced the truss when setting up with the touching probability of pore wall and probe stone, has not only reduced scraping rubbing to wall mud, reduces the hole probability of collapsing, has improved the efficiency in the clear hole of secondary moreover.

The utility model discloses a research of technology is set up under the pre-buried pipe of weir plug body cut-off wall, has solved the pre-buried pipe in the big boulder stratum of weir plug body cut-off wall and has set up the difficult technological problem, and the favorable smooth of having guaranteed follow-up cut-off wall engineering goes on, not only has set the quality and is showing the improvement, and suitability, economic nature all obtain improving moreover, provide the achievement of can borrowing for reference for big boulder stratum cut-off wall construction afterwards.

Although the above is the detailed description of the present invention, the present invention is not limited thereto, and those skilled in the art can modify the principle of the present invention, therefore, various modifications performed according to the principle of the present invention should be understood as falling into the protection scope of the present invention.

Claims (5)

1. The utility model provides a construction of weir plug body cut-off wall is with pre-buried pipe truss structure for a plurality of pre-buried pipes in the one deck pre-buried pipe of simultaneous localization just have together along with this layer of pre-buried pipe and set up in the slotted hole, its characterized in that includes:

the length extension direction of the main frame is parallel to the axial direction of the slotted hole and is used for fixing a plurality of embedded pipes;

a plurality of positioning frames fixedly connected with the main frame;

the positioning frames extend along the width direction of the slotted hole and are in line contact with two side walls of the slotted hole.

2. The structure of claim 1, wherein the plurality of spacers are spaced apart along a length of the main frame.

3. The structure of claim 2, wherein the spacer comprises:

the first positioning frame is fixedly connected with the main frame and extends out of the main frame towards the direction of the side wall of the slotted hole, and the first positioning frame is provided with a first connecting beam in line contact with the side wall of the slotted hole;

the second positioning frame is fixedly connected with the main frame and extends out of the main frame towards the other side wall of the slotted hole, and the second positioning frame is provided with a second connecting beam in line contact with one side wall of the slotted hole.

4. The structure of claim 1, wherein the spacer comprises:

an upper cantilever beam, one end of which is connected with the upper end of the main frame and extends along the width direction of the slotted hole;

one end of the lower suspension beam is connected with the lower end of the main frame and extends along the width direction of the slotted hole;

the two ends of the first connecting beam are respectively connected with one end of the upper overhanging beam and one end of the lower overhanging beam and are in line contact with one side wall of the slotted hole;

and the two ends of the second connecting beam are respectively connected with the other end of the upper overhanging beam and the other end of the lower overhanging beam and are in line contact with the other side wall of the slotted hole.

5. The structure of claim 4, wherein the main frame is provided with a plurality of notches for sleeving a plurality of the embedded pipes, and the notches are arranged at intervals along the length direction of the main frame.

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