CN112982469A

CN112982469A - Concrete building pile foundation suitable for bend abrupt trough spillway

Info

Publication number: CN112982469A
Application number: CN202110212926.7A
Authority: CN
Inventors: 邵烨
Original assignee: Individual
Current assignee: Anhui Jianke Construction Supervision Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-06-18
Anticipated expiration: 2041-02-25
Also published as: CN112982469B

Abstract

The invention relates to the technical field of hydraulic engineering, in particular to a concrete building pile foundation suitable for a curve abrupt trough spillway, which comprises a curve abrupt trough spillway, wherein a concrete bearing base is arranged at the lower part of the curve abrupt trough spillway, a precast pile is arranged at the lower part of the concrete bearing base, a supporting platform is arranged at the lower end of the precast pile, conical positioning columns are uniformly arranged on the lower surface of the supporting platform, anchor bars are uniformly embedded at one side of the concrete bearing base, one ends of the anchor bars, far away from the concrete bearing base, are connected with mounting steel plates, guide posts are uniformly arranged at one sides of the mounting steel plates, far away from the anchor bars, connecting frames are sleeved outside the guide posts, one ends of the guide posts penetrate through the outer sides of the connecting frames, retaining sleeves are inserted at the ends of the buffer springs, protective sleeves are sleeved outside the retaining sleeves, the protective sleeves are in threaded connection with the connecting frames. The invention can avoid impact damage of high-speed water flow to the flow boundary and simultaneously avoid sedimentation of the spillway.

Description

Concrete building pile foundation suitable for bend abrupt trough spillway

Technical Field

The invention relates to the technical field of hydraulic engineering, in particular to a concrete building pile foundation suitable for a curve steep trough spillway.

Background

The construction of spillway projects gradually becomes the key in the aspects of flood control, danger removal, reinforcement design and construction of hydraulic projects, but along with the large space of a hydraulic dam body, the high volume is continuously improved, and the curve steep groove spillway has become the key in the aspects of saving the project space and the volume, improving flood control and water storage capacity and the like of the hydraulic projects. In the steep groove spillway with the bend, the high-speed water flow has poor adaptability to the overflowing boundary, and easily impacts the convex side of the bend, thereby forming asymmetric shock waves in the spillway. After the granular silt carried in the high-speed water flow is accelerated along with the high-speed water flow, the granular silt can generate motion forms such as jumping, rolling and the like in the curve section, so that damage forms such as impact damage, smashing damage, abrasion damage and the like are generated on the overflow boundary of the spillway, and meanwhile, the sedimentation damage of the spillway can be caused after the impact force of the high-speed water flow on the bottom of the spillway is transmitted to the pile foundation.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a concrete building pile foundation suitable for a curved steep trough spillway, which can avoid impact damage of a convection boundary of high-speed water flow and settlement of the spillway.

In order to achieve the purpose, the invention adopts the following technical scheme:

the concrete building pile foundation suitable for the curve steep trough spillway is designed, and comprises the curve steep trough spillway, wherein a concrete bearing base is arranged at the lower part of the curve steep trough spillway, and a precast pile is arranged at the lower part of the concrete bearing base; a supporting platform is arranged at the lower end of the precast pile, and conical positioning columns are uniformly arranged on the lower surface of the supporting platform; anchor bars are uniformly embedded in one side of the concrete bearing base, and one ends of the anchor bars, which are far away from the concrete bearing base, are connected with mounting steel plates; guide posts are uniformly arranged on one side, away from the anchor bars, of the mounting steel plate, and a connecting frame is sleeved on the outer sides of the guide posts; one end of the guide post penetrates through the outer side of the connecting frame and is sleeved with a buffer spring, and a blocking sleeve is inserted at one end of the buffer spring, which is far away from the guide post; a protective sleeve is sleeved on the outer side of the blocking sleeve and is in threaded connection with the connecting frame; a connecting rod is inserted into the blocking sleeve, and one end of the connecting rod is fixedly connected with the guide post; a concrete substrate is arranged on the outer side of the connecting frame, and a sand collecting pool is arranged on the upper part of the concrete substrate; a diversion channel is arranged on one side of the sand collecting pool, and a return channel is arranged on one side of the sand collecting pool; the convex side wall of the curve steep trough spillway is provided with a discharge groove communicated with the water diversion groove, and one side of the curve steep trough spillway is provided with a water inlet groove communicated with the water return groove.

Preferably, I-shaped reinforcing rib plates are uniformly inserted into the mounting frame, and the mounting frame is provided with T-shaped slots matched with the reinforcing rib plates; the lower ends of the reinforcing rib plates are provided with sealing grooves, and sealing strips are arranged in the sealing grooves; the upper portion installation of installing frame is provided with the clamp plate, and the lower part of clamp plate is provided with sealed the pad.

Preferably, a water retaining wall is arranged in the sand collecting pool and is arranged along the diagonal line of the sand collecting pool; c-shaped guide rails are symmetrically arranged on one side, close to the water return groove, of the water retaining wall, stepped through holes are uniformly formed in the side face, close to the water return groove, of the water retaining wall, and ejector rods are arranged in the stepped through holes; an ejection spring is arranged at one end of the ejector rod, which is far away from the stepped through hole, and the other end of the ejector rod penetrates through the stepped through hole and is connected with a push plate; and a baffle is inserted between the two C-shaped guide rails.

Preferably, the symmetrical plane of the drainage channel and the symmetrical plane of the upstream straight channel of the curved steep groove spillway are the same vertical plane.

Preferably, the opposite side surfaces of the diversion channel and the drainage channel are respectively provided with a first mounting groove, mounting sleeves are embedded in the first mounting grooves, and a first water-stop copper plate is arranged between the two mounting sleeves in a sliding manner; the both ends outside of first stagnant water copper all is equipped with first uide bushing, and first uide bushing is provided with the sealing washer with first stagnant water copper laminating department, and first uide bushing passes through connecting bolt to be connected fixedly with the installation cover.

Preferably, guide rods are uniformly arranged in the two first mounting grooves, first jacking springs are sleeved on the outer sides of the guide rods, and first water-stop copper plates are arranged between the first jacking springs on the two sides; the cross section of the first guide sleeve is in a wedge shape; the height of the first guide sleeve is smaller than half of the distance between the water diversion groove and the water drainage groove.

Preferably, a second mounting groove is formed in one end, far away from the sand collecting pool, of the water return groove, and a mounting box is arranged in the second mounting groove; second tightening springs are uniformly arranged in the mounting box, and a second water stop copper plate is arranged on one side, away from the mounting box, of each second tightening spring; the outer side of the second water stop copper plate is sleeved with a limiting sleeve, and the limiting sleeve is fixedly connected with the mounting box; one end of the water inlet groove is embedded with a sliding plate matched with the second water stop copper plate.

Preferably, the outer side of the lower part of the sand collecting pool is uniformly provided with a fixed plate, and a second guide sleeve is embedded in the fixed plate; the upper part of the concrete substrate is provided with a positioning plug bush which is embedded and matched with the second guide bush; an inserting rod is inserted into the second guide sleeve, and the lower end of the inserting rod penetrates through the second guide sleeve and is inserted into the positioning insertion sleeve.

Preferably, the lower part of the sand collecting pool is uniformly embedded with guide strips; and a guide rail matched with the guide strip is embedded on the upper surface of the concrete substrate.

The concrete building pile foundation applicable to the curve steep trough spillway provided by the invention has the beneficial effects that:

1. through the supporting platform that sets up in the lower part of precast pile, increased the bearing capacity of ground, avoided the subsidence damage of spillway.

2. The discharge grooves communicated with the water guide grooves are formed in the convex side walls of the curved steep groove spillway, so that high-speed water impacting the convex side walls flows into the sand collecting pond, and impact damage of high-speed water flow to the steep groove spillway is avoided.

Drawings

FIG. 1 is a schematic top view of a concrete building pile foundation suitable for a curved steep trough spillway according to the present invention;

FIG. 2 is a schematic structural view of a section A of a concrete building pile foundation suitable for a curved steep trough spillway, provided by the invention;

FIG. 3 is a schematic structural diagram of a section at the position B in a concrete building pile foundation suitable for a curved steep trough spillway, which is provided by the invention;

FIG. 4 is a schematic structural view of a section at the C position in a concrete building pile foundation suitable for a curved steep trough spillway, which is provided by the invention;

FIG. 5 is a schematic diagram of a D-section structure in a concrete building pile foundation suitable for a curved road steep trough spillway provided by the invention

FIG. 6 is an enlarged schematic structural view of a portion E of a concrete building pile foundation suitable for a curved steep trough spillway, according to the present invention;

FIG. 7 is an enlarged structural diagram of a portion F of a concrete building pile foundation suitable for a curved steep trough spillway, according to the present invention;

fig. 8 is an enlarged structural diagram of a portion G of a concrete building pile foundation suitable for a curved steep trough spillway, according to the present invention;

FIG. 9 is an enlarged structural diagram of a portion H of a concrete building pile foundation suitable for a curved steep trough spillway, according to the present invention;

fig. 10 is an enlarged structural schematic diagram of a portion J of a concrete building pile foundation suitable for a curved steep trough spillway provided by the invention.

In the figure: a curve steep groove spillway 1, a concrete bearing base 2, a precast pile 3, an anchor bar 4, a mounting steel plate 5, a guide post 6, a connecting frame 7, a buffer spring 8, a connecting rod 9, a concrete substrate 10, a sand collecting pool 11, a water diversion groove 12, a water return groove 13, a water drainage groove 14, a water inlet groove 15, a supporting platform 16, a positioning post 17, a protective sleeve 18, a baffle sleeve 19, a reinforcing rib plate 20, a sealing strip 21, a pressing plate 22 and a sealing gasket 23, the water-stop wall 24, a top rod 25, an ejection spring 26, a push plate 27, a C-shaped guide rail 28, a baffle 29, a mounting sleeve 30, a first water-stop copper plate 31, a first guide sleeve 32, a sealing ring 33, a guide rod 34, a first tightening spring 35, a fixing plate 36, a second guide sleeve 37, a positioning insertion sleeve 38, an insertion rod 39, a guide strip 40, a guide rail 41, a mounting box 42, a second tightening spring 43, a second water-stop copper plate 44, a limiting sleeve 45 and a sliding plate 46.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-10, a concrete building pile foundation suitable for bend abrupt trough spillway, including bend abrupt trough spillway 1, the lower part of bend abrupt trough spillway 1 is provided with concrete bearing base 2, the lower part of concrete bearing base 2 is provided with precast pile 3, the lower extreme of precast pile 3 is provided with supporting platform 16, supporting platform 16's lower surface evenly is provided with conical reference column 17, bear base 2 through precast pile 3 to concrete, utilize reference column 17 to fix a position supporting platform 16 simultaneously, increased the area of contact with the ground through supporting platform 16 simultaneously, thereby the bearing capacity of ground has been increased.

One side of the concrete bearing base 2 is uniformly embedded with anchor bars 4, one end of each anchor bar 4, which is far away from the concrete bearing base 2, is connected with a mounting steel plate 5, one side of each mounting steel plate 5, which is far away from each anchor bar 4, is uniformly provided with a guide post 6, the outer side of each guide post 6 is sleeved with a connecting frame 7, one end of each guide post 6, which penetrates through the outer side of the corresponding connecting frame 7, is sleeved with a buffer spring 8, one end of each buffer spring 8, which is far away from each guide post 6, is inserted with a retaining sleeve 19, the outer side of each retaining sleeve 19 is sleeved with a protective sleeve 18, the protective sleeve 18 is in threaded connection with the corresponding connecting frame 7, a connecting rod 9 is inserted in each retaining, bear base 2 with concrete base plate 10 through installation steel sheet 5 and coupling frame 7 with concrete and be connected fixedly, make collection husky pond 11 cushion the atress under the impact of water through buffer spring 8 simultaneously.

The upper portion of concrete substrate 10 is provided with husky pond 11 of collection, one side in husky pond 11 of collection is provided with diversion channel 12, one side in husky pond 11 of collection is provided with return flume 13, the protruding lateral wall department of bend abrupt groove spillway 1 is provided with discharge flume 14 with diversion channel 13 intercommunication, one side of bend abrupt groove spillway 1 is provided with intake flume 15 with return flume 13 intercommunication, high-speed rivers to bend abrupt groove spillway 1 are shunted through discharge flume 14, thereby avoid the impact on high-speed rivers convection boundary.

Evenly insert the deep floor 20 that is equipped with the I shape in installing frame 7, installing frame 7 seted up with deep floor 20 assorted T type slot, sealed recess has all been seted up to deep floor 20's lower extreme, be provided with sealing strip 21 in the sealed recess, the upper portion installation of installing frame 7 is provided with clamp plate 22, clamp plate 22's lower part is provided with sealed pad 23, carry out the reinforcing support to installing frame 7 through deep floor 20, make installing frame 7 be in encapsulated situation through clamp plate 22 simultaneously, avoid debris or water to enter into in installing frame 7, make buffer spring 8 obtain the protection.

Be provided with waterwall 24 in the husky pond 11 of collection, waterwall 24 sets up along the diagonal of the husky pond 11 of collection, one side symmetry that waterwall 24 is close to return water tank 13 is provided with C type guide rail 28, the side that waterwall 24 is close to return water tank 13 has evenly seted up the ladder through-hole, be provided with ejector pin 25 in the ladder through-hole, ejector pin 25 keeps away from ladder through-hole one end and is provided with ejecting spring 26, the ejector pin 25 other end passes the ladder through-hole and is connected with push pedal 27, it is equipped with baffle 29 to insert between two C type guide rail 28, block getting into husky pond 11 high-speed rivers through waterwall 24, thereby will reduce the velocity of flow of water, cushion the atress to the push pedal 27 by high-speed rivers impact simultaneously.

The symmetry plane of the drainage channel 14 and the symmetry plane of the straight upper stream of the curve steep trough spillway 1 are the same vertical plane, so that the water flow directly enters the sand collecting pool 11 when the direction of the water flow is not deviated, the impact of the water flow on the convex side wall of the curve steep trough spillway 1 is avoided, and the wall body of the curve steep trough spillway 1 is prevented from being damaged by long-term washing of the water flow.

First mounting groove has all been seted up with the opposite flank of gutter 12, it has installation cover 30 to inlay in the first mounting groove, it is provided with first stagnant water copper 31 to slide between two installation covers 30, the both ends outside of first stagnant water copper 31 all is equipped with first uide bushing 32, first uide bushing 32 is provided with sealing washer 33 with first stagnant water copper 31 laminating department, first uide bushing 32 passes through connecting bolt and is connected fixedly with installation cover 30, through first stagnant water copper 31 respectively with gutter 12 and the equal sliding connection of gutter 14, thereby make first stagnant water copper 31 communicate gutter 12 and gutter 14.

All evenly be provided with guide bar 34 in two first mounting grooves, the outside cover of guide bar 34 is equipped with first top tension spring 35, be provided with first stagnant water copper 31 between the first top tension spring 35 of both sides, the cross-section of first uide bushing 32 is the wedge form, the height of first uide bushing 32 is less than half of the distance between diversion 12 and water drainage tank 14, the wedge setting through first uide bushing 32 for grit or debris that fall on first stagnant water copper 31 can be pushed away from by first uide bushing 32.

The one end that husky pond 11 of collection was kept away from to return water tank 13 has been seted up the second mounting groove, be provided with mounting box 42 in the second mounting groove, evenly be provided with second top tension spring 43 in the mounting box 42, second top tension spring 43 is kept away from mounting box 42 one side and is provided with second stagnant water copper 44, the outside cover of second stagnant water copper 44 is equipped with stop collar 45, stop collar 45 and mounting box fixed connection, the one end of intake chamber 15 is inlayed and is had the slide 46 with second stagnant water copper 44 assorted, promote second stagnant water copper 44 extrusion slide 46 through second top tension spring 43, thereby make second stagnant water copper 44 take place the relative slip with slide 46, and keep the intercommunication of return water tank 13 and intake chamber 15.

The fixed plate 36 is evenly provided with in the lower part outside of collection husky pond 11, it has second uide bushing 37 to inlay in the fixed plate 36, the upper portion setting of concrete substrate 10 is inlayed and is had with the location plug bush 38 of second uide bushing 37 assorted, the interpolation of second uide bushing 37 is equipped with inserted bar 39, the lower extreme of inserted bar 39 runs through second uide bushing 37 and inserts in the location plug bush 38, insert in the location plug bush 38 through inserted bar 39, make collection husky pond 11 be convenient for install fixed to concrete substrate 10 on.

The guide strips 40 are uniformly embedded in the lower portion of the sand collecting pool 11, the guide rails 41 matched with the guide strips 40 are embedded in the upper surface of the concrete substrate 10, and the sand collecting pool 11 is convenient to mount on the concrete substrate 10 through the sliding connection mode between the guide strips 40 and the guide rails 41.

The working principle is as follows: during the building, with concrete bearing base 2 install the precast pile 3 on the back, utilize guide post 6 with linking frame 7 with ann change steel sheet 5 direction and be connected, it is fixed with linking frame 7 to utilize connecting rod 9, thereby it is fixed to make concrete substrate 10 and concrete bearing base 2 be connected, utilize buffer spring 8 to make concrete substrate 10 can slide along guide post 6 simultaneously, recycle the sliding connection mode between gib block 40 and guide rail 41, thereby make collection husky pond 11 be convenient for install on concrete substrate 10.

When flood discharge is carried out, the symmetrical plane of the drainage channel 14 and the symmetrical plane of the upper straight channel of the curve steep trough spillway 1 are the same vertical plane, so that the water flow directly enters the sand collecting pool 11 when the direction of the water flow is not deviated, impact of the water flow on the convex side wall of the curve steep trough spillway 1 is avoided, the wall body of the curve steep trough spillway 1 is further prevented from being damaged by long-term washing of the water flow, the first water-stop copper plate 31 is respectively in sliding connection with the diversion channel 12 and the drainage channel 14, the diversion channel 12 is communicated with the drainage channel 14 through the first water-stop copper plate 31, high-speed water flows into the sand collecting pool 11 through the diversion channel 12, the high-speed water flow entering the sand collecting pool 11 is blocked through the water retaining wall 24, the flow rate of the water body is reduced, meanwhile, the push plate 27 impacted by the high-speed water flow is buffered and stressed through the ejection spring 26, and the water retaining wall 24 is more stable, the second tightening spring 43 pushes the second water-stop copper plate 44 to press the sliding plate 46, so that the second water-stop copper plate 44 slides relative to the sliding plate 46, and the communication between the water return tank 13 and the water inlet tank 15 is maintained, so that the decelerated water flows back to the curved steep groove spillway 1.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims

1. A concrete building pile foundation suitable for a curve steep trough spillway comprises a curve steep trough spillway (1), and is characterized in that a concrete bearing base (2) is arranged at the lower part of the curve steep trough spillway (1), and a precast pile (3) is arranged at the lower part of the concrete bearing base (2); a supporting platform (16) is arranged at the lower end of the precast pile (3), and conical positioning columns (17) are uniformly arranged on the lower surface of the supporting platform (16); anchor bars (4) are uniformly embedded in one side of the concrete bearing base (2), and one end, far away from the concrete bearing base (2), of each anchor bar (4) is connected with a mounting steel plate (5); guide columns (6) are uniformly arranged on one side, away from the anchor bars (4), of the mounting steel plate (5), and connecting frames (7) are sleeved on the outer sides of the guide columns (6); one end of the guide post (6) penetrates through the outer side of the connecting frame (7) and is sleeved with a buffer spring (8), and a blocking sleeve (19) is inserted at one end, far away from the guide post (6), of the buffer spring (8); a protective sleeve (18) is sleeved on the outer side of the blocking sleeve (19), and the protective sleeve (18) is in threaded connection with the connecting frame (7); a connecting rod (9) is inserted into the blocking sleeve (19), and one end of the connecting rod (9) is fixedly connected with the guide post (6); a concrete substrate (10) is arranged on the outer side of the connecting frame (7), and a sand collecting pool (11) is arranged on the upper part of the concrete substrate (10); a water diversion groove (12) is formed in one side of the sand collecting pool (11), and a water return groove (13) is formed in one side of the sand collecting pool (11); the convex side wall of the curve steep trough spillway (1) is provided with a discharge groove (14) communicated with the water diversion groove (13), and one side of the curve steep trough spillway (1) is provided with a water inlet groove (15) communicated with the water return groove (13).

2. The concrete building pile foundation applicable to the curved steep trough spillway according to claim 1, wherein I-shaped reinforcing rib plates (20) are uniformly inserted into the installation frame (7), and T-shaped slots matched with the reinforcing rib plates (20) are formed in the installation frame (7); the lower ends of the reinforcing rib plates (20) are provided with sealing grooves, and sealing strips (21) are arranged in the sealing grooves; the upper portion of installing frame (7) installation is provided with clamp plate (22), and the lower part of clamp plate (22) is provided with sealed pad (23).

3. The concrete building pile foundation applicable to the curved steep trough spillway according to claim 1, wherein a water retaining wall (24) is arranged in the sand collecting pool (11), and the water retaining wall (24) is arranged along a diagonal line of the sand collecting pool (11); c-shaped guide rails (28) are symmetrically arranged on one side, close to the water return groove (13), of the water retaining wall (24), stepped through holes are uniformly formed in the side face, close to the water return groove (13), of the water retaining wall (24), and ejector rods (25) are arranged in the stepped through holes; an ejection spring (26) is arranged at one end of the ejector rod (25) far away from the stepped through hole, and the other end of the ejector rod (25) penetrates through the stepped through hole and is connected with a push plate (27); a baffle (29) is inserted between the two C-shaped guide rails (28).

4. The concrete building pile foundation for a curved steep trough spillway according to claim 1, wherein the symmetry plane of the drainage channel (14) is the same vertical plane as the symmetry plane of the straight upper run of the curved steep trough spillway (1).

5. The concrete building pile foundation applicable to the curved steep trough spillway according to claim 1, wherein the opposite sides of the water diversion groove (12) and the water drainage groove (14) are respectively provided with a first installation groove, an installation sleeve (30) is embedded in the first installation groove, and a first water-stop copper plate (31) is arranged between the two installation sleeves (30) in a sliding manner; the outer sides of the two ends of the first water stop copper plate (31) are respectively provided with a first guide sleeve (32), a sealing ring (33) is arranged at the joint of the first guide sleeve (32) and the first water stop copper plate (31), and the first guide sleeve (32) is fixedly connected with the mounting sleeve (30) through a connecting bolt.

6. The concrete building pile foundation suitable for the curved steep trough spillway according to claim 5, wherein guide rods (34) are uniformly arranged in the two first mounting grooves, first jacking springs (35) are sleeved outside the guide rods (34), and a first water-stop copper plate (31) is arranged between the first jacking springs (35) on the two sides; the cross section of the first guide sleeve (32) is in a wedge shape; the height of the first guide sleeve (32) is smaller than half of the distance between the water diversion groove (12) and the water drainage groove (14).

7. The concrete building pile foundation applicable to the curved steep trough spillway according to claim 1, wherein a second mounting groove is formed in one end, away from the sand collecting pool (11), of the water return tank (13), and a mounting box (42) is arranged in the second mounting groove; second tightening springs (43) are uniformly arranged in the mounting box (42), and a second water-stopping copper plate (44) is arranged on one side, far away from the mounting box (42), of each second tightening spring (43); a limiting sleeve (45) is sleeved on the outer side of the second water stop copper plate (44), and the limiting sleeve (45) is fixedly connected with the mounting box; one end of the water inlet groove (15) is embedded with a sliding plate (46) matched with the second water stop copper plate (44).

8. The concrete building pile foundation applicable to the curved steep trough spillway according to claim 1, wherein a fixing plate (36) is uniformly arranged on the outer side of the lower part of the sand collecting pool (11), and a second guide sleeve (37) is embedded in the fixing plate (36); a positioning plug bush (38) matched with the second guide bush (37) is embedded in the upper part of the concrete substrate (10); an inserting rod (39) is inserted into the second guide sleeve (37), and the lower end of the inserting rod (39) penetrates through the second guide sleeve (37) and is inserted into the positioning insertion sleeve (38).

9. The concrete building pile foundation applicable to the curved steep spillway according to claim 8, wherein the lower part of the sand collecting pool (11) is uniformly embedded with a guide strip (40); and guide rails (41) matched with the guide strips (40) are embedded on the upper surface of the concrete substrate (10).