阅读说明：本技术 用于分期施工不等高底板的连接构造及其施工方法 (Connection structure for constructing unequal-height bottom plates in stages and construction method thereof ) 是由 崔寿凯 高辉 张连魁 杨红岩 王凯峰 刘艳磊 杨锋 陈刚 袁红岗 刘涛涛 于 2019-10-10 设计创作，主要内容包括：本发明涉及一种用于分期施工不等高底板的连接构造,包括：浇筑形成于一期底板靠近待施工的二期底板的一侧的垫层；预留于一期底板底部的防水层上靠近垫层一端的防水延伸段,且该防水延伸段铺设于垫层上；浇筑形成于防水延伸段之上的承台梁,该承台梁对应待施工的二期底板的位置处埋设有部分露出的止水件；砌筑于垫层之上且与承台梁之间具有设定距离的砖模,该防水延伸段有部分自承台梁的底部伸出并沿着垫层铺设,进而沿着砖模向上翻折并搭设于砖模顶部,于承台梁与砖模之间回填砂浆以形成连接带；以及浇筑形成于砖模与一期支护桩之间的传力带。本发明有效地解决了不等高底板施工困难的问题,能够防止渗漏水,保证施工质量。(The invention relates to a connection structure for a different-height bottom plate constructed in stages, which comprises: pouring a cushion layer formed on one side of the first-stage bottom plate close to the second-stage bottom plate to be constructed; a waterproof extension section which is reserved on the waterproof layer at the bottom of the first-stage bottom plate and is close to one end of the cushion layer, and the waterproof extension section is laid on the cushion layer; pouring a bearing platform beam formed on the waterproof extension section, wherein a part of exposed water stop pieces are embedded at the position of the bearing platform beam corresponding to a second-stage bottom plate to be constructed; the waterproof extension section is partially extended out of the bottom of the bearing platform beam and laid along the cushion layer, and then is turned upwards along the brick mould and is erected at the top of the brick mould, and mortar is backfilled between the bearing platform beam and the brick mould to form a connecting belt; and pouring a force transmission belt formed between the brick mould and the first-stage support pile. The invention effectively solves the problem of difficult construction of the base plates with different heights, can prevent water leakage and ensures the construction quality.)

1. The utility model provides a joint construction for unequal-height bottom plate of stage construction, a serial communication port, joint construction is used for connecting the first phase bottom plate that has been under construction and the second phase bottom plate of waiting to be under construction, just first phase bottom plate with the top surface elevation of the second phase bottom plate of waiting to be under construction varies, it is equipped with a phase fender pile to beat around the first phase bottom plate, the tip of first phase bottom plate is beaten and is equipped with a phase engineering stake, joint construction includes:

pouring a cushion layer formed on one side, close to the second-stage bottom plate to be constructed, of the first-stage bottom plate, wherein the cushion layer is located on the first-stage engineering pile, and the end of the cushion layer abuts against the first-stage support pile;

a waterproof extension section which is reserved on the waterproof layer at the bottom of the first-stage bottom plate and is close to one end of the cushion layer, and the waterproof extension section is laid on the cushion layer;

pouring a bearing platform beam which is formed on the waterproof extension section and is close to the primary bottom plate, wherein the corresponding part of the bearing platform beam is in anchoring connection with the primary bottom plate, and a part of exposed water stop pieces are embedded in the position, corresponding to the secondary bottom plate to be constructed, of the bearing platform beam;

the waterproof extension section is partially extended out of the bottom of the bearing platform beam and laid along the cushion layer, and then is turned upwards along the brick mould and is erected at the top of the brick mould, mortar is backfilled between the bearing platform beam and the brick mould to form a connecting belt, and the water stop piece is embedded in the connecting belt; and

and pouring a force transmission belt formed between the brick mould and the primary support pile.

2. The connection structure for the unequal-height floor plates in staged construction according to claim 1, wherein the bearing platform beam is L-shaped in cross section and comprises a vertical part anchored with the primary floor plate and a horizontal part perpendicular to the vertical part and disposed on the waterproof extension section, the thickness of the horizontal part is equal to the set thickness of the secondary floor plate to be constructed, and a part of a slinger protruding outwards is embedded in the horizontal part.

3. The connection structure for the staged construction unequal-height floor as claimed in claim 2, wherein the bearing platform beam further comprises an end head part cast and formed on one side of the horizontal part close to the brick mold, the top surface of the end head part is flush with the top surface of the horizontal part, and the water stop part is partially buried in the end head part.

4. The connection structure for the phased-construction unequal-height floor according to claim 1, wherein the water stop member comprises a partially exposed steel plate buried in the bearing platform beam, an extruded plate laid on the exposed portion of the steel plate, and a U-shaped stirrup for clamping the steel plate and the extruded plate.

5. The connection structure for the phased-construction unequal-height floor according to claim 1, wherein the top of the primary engineering pile is provided with an anchor bar which protrudes outwards, and the anchor bar correspondingly penetrates through the cushion layer and the waterproof extension section and is anchored into the bearing platform beam.

6. The coupling construction for the construction unequal height floor boards by stages as claimed in claim 1, wherein the end of the first stage floor board has a reserved rib protruding outward;

the reserved ribs are anchored into the bearing platform beam.

7. A construction method for constructing a joint construction of unequal-height floor boards in stages according to claim 1, comprising the steps of:

when the first-stage bottom plate is constructed, reserving a part on one side, close to a second-stage bottom plate to be constructed, of a waterproof layer laid at the bottom of the first-stage bottom plate to form a waterproof extension section;

pouring a cushion layer on one side of the first-stage bottom plate close to the second-stage bottom plate to be constructed, wherein the cushion layer is positioned on the first-stage engineering pile, the end part of the cushion layer is abutted against the first-stage supporting pile, and the waterproof extension section is laid on the cushion layer;

pouring concrete on the waterproof extension section to form a bearing platform beam with one end anchored with the first-stage bottom plate, wherein the water stop piece is embedded in the position, corresponding to the second-stage bottom plate to be constructed, of the bearing platform beam;

building a brick mould with a set distance from the cushion layer to the bearing platform beam;

laying the part of the waterproof extension section extending out of the bottom of the bearing platform beam along the cushion layer, turning upwards along the brick mould and erecting the waterproof extension section at the top of the brick mould;

backfilling mortar on the waterproof extension section between the brick mold and the bearing platform beam to form a connecting belt covering the water stop piece;

and backfilling mortar on the cushion layer between the first-stage support pile and the brick mold to form a force transmission belt.

8. The construction method for the connection structure of the unequal-height bottom plates by stages according to claim 7, characterized in that, before the bearing platform beam is poured, a sling is arranged in the pouring space of the bearing platform beam, and the sling part extends out of the part, corresponding to the second-stage bottom plate to be constructed, of the bearing platform beam to be poured;

and when the connecting band is poured, the extending part of the throwing rib is embedded in the connecting band.

Technical Field

The invention relates to the field of building construction, in particular to a connecting structure for constructing unequal-height bottom plates in stages and a construction method thereof.

Background

Due to the facts that capital, engineering quantity and the like often cause that one project needs to be constructed in stages, meanwhile, the currently developed project saves land, space is needed to be arranged underground, three layers of basements or even more are often needed to be constructed, due to the space design needs of underground buildings, such as underground garages and the like, underground structures often need to be connected together, due to asynchronous construction, the building foundation bottom plates possibly have the problem of inconsistent height, if the base plates with unequal heights are simply poured and connected by concrete, quality problems such as water leakage and the like can occur, meanwhile, no effective force transmission structure exists between foundation pits, and the foundation pits deform excessively.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a connection structure for constructing unequal-height bottom plates in stages and a construction method thereof, solves the problem of difficulty in construction of the unequal-height bottom plates, can prevent water leakage, ensures construction quality, and forms a force transmission structure to prevent overlarge deformation of a foundation pit.

The technical scheme for realizing the purpose is as follows:

the invention provides a connection structure for a base plate with unequal heights in stage construction, which is used for connecting a constructed first-stage base plate and a to-be-constructed second-stage base plate, wherein the top surface elevations of the first-stage base plate and the to-be-constructed second-stage base plate are unequal, a first-stage support pile is arranged around the first-stage base plate, a first-stage engineering pile is arranged at the end part of the first-stage base plate, and the connection structure comprises:

pouring a cushion layer formed on one side, close to a second-stage bottom plate to be constructed, of the first-stage bottom plate, wherein the cushion layer is positioned on the first-stage engineering pile, and the end part of the cushion layer abuts against the first-stage support pile;

a waterproof extension section which is reserved on the waterproof layer at the bottom of the first-stage bottom plate and is close to one end of the cushion layer, and the waterproof extension section is laid on the cushion layer;

pouring a bearing platform beam which is formed on the waterproof extension section and is close to the first-stage bottom plate, wherein the corresponding part of the bearing platform beam is in anchoring connection with the first-stage bottom plate, and a part of exposed water stop pieces are embedded at the position of the bearing platform beam corresponding to the second-stage bottom plate to be constructed;

the waterproof extension section is partially extended out of the bottom of the bearing platform beam and laid along the cushion layer, and then is turned upwards along the brick mould and is erected at the top of the brick mould, mortar is backfilled between the bearing platform beam and the brick mould to form a connecting belt, and the water stop piece is embedded in the connecting belt; and

and pouring a force transmission belt formed between the brick mould and the first-stage support pile.

The invention adopts a connection structure for constructing unequal-height bottom plates in stages, a waterproof extension section extending outwards from the bottom of a first-stage bottom plate is arranged on a cushion layer, a bearing platform beam is constructed on the waterproof extension section, the bearing platform beam is anchored with the first-stage bottom plate, a brick mold is built on the cushion layer, a part corresponding to the waterproof extension section is turned upwards and fixed at the top of the brick mold, mortar is filled in the waterproof extension section between the brick mold and the bearing platform beam to form a connection belt, so that a force transmission structure is formed between the first-stage bottom plate and a first-stage support pile, the deformation of a foundation pit is prevented from being overlarge, the waterproof extension section on the brick mold can be taken down and laid on the cushion layer when the second-stage bottom plate is constructed in the later stage, and therefore, the connection structure for connecting the first-stage bottom plate and the second-stage bottom plate is formed, the problem of difficult construction of the unequal-height bottom plates is solved, water.

The invention is further improved for the connection structure of the unequal-height bottom plates in the stage construction, the cross section of the bearing platform beam is L-shaped, the bearing platform beam comprises a vertical part anchored with the first-stage bottom plate and a horizontal part which is vertical to the vertical part and is arranged on the waterproof extension section, the thickness of the horizontal part is equal to the set thickness of the second-stage bottom plate to be constructed, and the horizontal part is embedded with a throwing rib with a part protruding outwards.

The invention is further improved in that the bearing platform beam further comprises an end head part which is formed on one side of the horizontal part close to the brick mold in a pouring mode, the top surface of the end head part is flush with the top surface of the horizontal part, and the water stop part is partially buried in the end head part.

The invention is further improved for the connection structure of the unequal-height bottom plates constructed in stages, and the water stop piece comprises a steel plate which is embedded in the bearing platform beam and is partially exposed, an extruded sheet which is laid on the exposed part of the steel plate and a U-shaped stirrup which is used for clamping the steel plate and the extruded sheet.

The invention is further improved for the connection structure of the unequal-height bottom plates constructed in stages, the top of the first-stage engineering pile is provided with an anchor bar which protrudes outwards, and the anchor bar correspondingly penetrates through the cushion layer and the waterproof extension section and is anchored into the bearing platform beam.

The invention is used for constructing the connection structure of the unequal-height bottom plate in stages and is further improved in that the end part of the first-stage bottom plate is provided with a reserved rib which protrudes outwards;

the reserved ribs are anchored into the bearing platform beam.

The invention provides a construction method for constructing a connection structure of unequal-height bottom plates in stages, which comprises the following steps:

when the first-stage base plate is constructed, reserving a part on one side, close to the second-stage base plate to be constructed, of the waterproof layer laid at the bottom of the first-stage base plate to form a waterproof extension section;

pouring a cushion layer on one side of the first-stage bottom plate close to the second-stage bottom plate to be constructed, wherein the cushion layer is positioned on the first-stage engineering pile, the end part of the cushion layer is abutted against the first-stage support pile, and the waterproof extension section is laid on the cushion layer;

pouring concrete on the waterproof extension section to form a bearing platform beam with one end anchored with the primary bottom plate;

a water stop piece is embedded at the position of the bearing platform beam corresponding to the second-stage bottom plate to be constructed;

building a brick mould with a set distance from the bearing platform beam on the cushion layer;

laying the part of the waterproof extension section extending out of the bottom of the bearing platform beam along the cushion layer, and further turning upwards along the brick mould and erecting the waterproof extension section at the top of the brick mould;

filling mortar on the waterproof extension section between the brick mould and the bearing platform beam to form a connecting belt for covering the water stop piece;

and backfilling mortar on a cushion layer between the first-stage support pile and the brick mold to form a force transmission belt.

The construction method for constructing the connection structure of the unequal-height bottom plates in stages is further improved in that before the bearing platform beam is poured, the throwing ribs are arranged in the pouring space of the bearing platform beam, and the throwing ribs extend out of the part, corresponding to the second-stage bottom plate to be constructed, on the bearing platform beam to be poured;

when the connecting belt is poured, the extending part of the throwing rib is embedded in the connecting belt.

Drawings

Fig. 1 is an overall sectional view of a coupling structure for a variable-height floor according to the present invention, which is constructed in stages.

FIG. 2 is a partially enlarged schematic view of a water stopping member of the connection structure for a variable-height floor in staged construction according to the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

The invention adopts a connection structure for constructing unequal-height bottom plates in stages, a waterproof extension section extending outwards from the bottom of a first-stage bottom plate is arranged on a cushion layer, a bearing platform beam is constructed on the waterproof extension section, the bearing platform beam is anchored with the first-stage bottom plate, a brick mold is built on the cushion layer, a part corresponding to the waterproof extension section is turned upwards and fixed at the top of the brick mold, mortar is filled in the waterproof extension section between the brick mold and the bearing platform beam to form a connection belt, so that a force transmission structure is formed between the first-stage bottom plate and a first-stage support pile, the deformation of a foundation pit is prevented from being overlarge, the waterproof extension section on the brick mold can be taken down and laid on the cushion layer when the second-stage bottom plate is constructed in the later stage, and therefore, the connection structure for connecting the first-stage bottom plate and the second-stage bottom plate is formed, the problem of difficult construction of the unequal-height bottom plates is solved, water. The following describes a connection structure for a variable-height floor in a staged construction according to the present invention with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a sectional view of an overall structure of a coupling structure for a variable-height floor according to the present invention, which is constructed in stages. The following describes a connection structure for a variable-height floor according to the present invention in stages with reference to fig. 1.

As shown in fig. 1, the present invention provides a connection structure for a base plate with unequal heights in staged construction, the connection structure is used for connecting a constructed first-stage base plate 21 and a to-be-constructed second-stage base plate, the top surface elevations of the first-stage base plate 21 and the to-be-constructed second-stage base plate are unequal, a first-stage support pile 213 is driven around the first-stage base plate 21, a first-stage engineering pile 212 is driven at an end of the first-stage base plate 21, and the connection structure includes:

pouring a cushion layer 16 formed on one side of the primary bottom plate 21 close to the secondary bottom plate to be constructed, wherein the cushion layer 16 is positioned on the primary engineering pile 212 and the end part of the cushion layer abuts against the primary support pile 213;

a waterproof extension 21111 reserved on the waterproof layer 211 at the bottom of the first-stage bottom plate 21 and close to one end of the cushion layer 16, wherein the waterproof extension 21111 is laid on the cushion layer 16;

a bearing platform beam 11 which is formed on the waterproof extension section 2111 in a pouring mode and is close to the first-stage bottom plate 21, the corresponding part of the bearing platform beam 11 is connected with the first-stage bottom plate 21 in an anchoring mode, and a part of exposed water stop pieces 12 are embedded at the position, corresponding to the second-stage bottom plate to be constructed, of the bearing platform beam 11;

a brick mold 14 which is built on the cushion layer 16 and has a set distance with the bearing platform beam 11, wherein part of the waterproof extension 2111 extends out from the bottom of the bearing platform beam 11 and is laid along the cushion layer 16, and is further turned upwards along the brick mold 14 and fixed at the top of the brick mold 14, mortar is backfilled between the bearing platform beam 11 and the brick mold 14 to form a connecting band 13, the water stop piece 12 is embedded in the connecting band 13, and the bearing platform beam 11 can support the corresponding end part of the primary bottom plate 21; and

the force transmission belt 15 formed between the brick mold 14 and the first-stage support pile 213 in a pouring mode is connected with the first-stage support pile 213 through the force transmission belt 15, so that pressure applied to the connecting structure in the building construction process on the first-stage bottom plate 21 can be transmitted to the first-stage support pile 213, the effect of back-jacking transmission is achieved, and deformation caused by overlarge pressure applied to the connecting structure and the first-stage bottom plate is avoided.

Preferably, the top of the primary engineering pile 212 is provided with an anchor bar protruding outwards, and the anchor bar correspondingly penetrates through the cushion layer 16 and the waterproof extension 2111 and is anchored into the bolster beam 11 to fix the bolster beam 11 to the cushion layer 16, and can vertically transmit stress to the primary engineering pile 212.

Preferably, the end of the first-stage bottom plate 21 has a reserved rib protruding outwards;

the embedded rib is anchored into the bearing platform beam 11 to fix the bearing platform beam 11 on the first-stage base plate 21, and the bearing platform beam 11 can wrap the anchor rib of the first-stage base plate 21, so that the anchor rib of the first-stage base plate 21 is prevented from protruding outwards, and the anchor rib of the first-stage base plate 21 is protected.

As a preferred embodiment of the present invention, the platform beam 11 has an L-shaped cross section, and includes a vertical portion 111 anchored to the first-stage base plate 21 and a horizontal portion 112 perpendicular to the vertical portion 111 and disposed on the waterproof extension portion 2111, wherein the thickness of the horizontal portion 112 is equal to the set thickness of the second-stage base plate to be constructed, and a part of a whip 1121 protruding outward is embedded in the horizontal portion 112.

Specifically, the platform beam 11 further includes a head portion 113 formed on one side of the horizontal portion 112 close to the brick mold 14 by pouring, a top surface of the head portion 113 is flush with a top surface of the horizontal portion 112, and the water stop member 12 is partially embedded in the head portion 113.

Preferably, as shown in fig. 2, the water stop 12 includes a partially exposed steel plate 121 embedded in the end portion 113, an extruded plate 122 laid on the exposed portion of the steel plate 121, and a U-shaped stirrup 123 for clamping the steel plate 121 and the extruded plate 122, wherein the extruded plate 122 can protect the steel plate 121.

One embodiment of the present invention is as follows:

before constructing the first-stage bottom plate 21, a first-stage support pile 213 is arranged at a position close to the first-stage bottom plate 21 to be formed, first-stage engineering piles 212 are arranged around the first-stage bottom plate 21 to be formed, and when a waterproof extension section 2111 of the first-stage bottom plate 21 is laid, a part of the waterproof extension section 2111 is reserved to extend outwards from the end part of the first-stage bottom plate 21;

pouring a cushion layer 16 between the first-stage engineering pile 212 and the first-stage support pile 213, placing the waterproof extension section 2111 on the cushion layer 16, and further pouring a bearing platform beam 11 on the waterproof extension section 2111, so that one end of the bearing platform beam 11 is anchored with the first-stage bottom plate 21, and the other end of the bearing platform beam 11 is anchored with the first-stage engineering pile 212;

pouring concrete at the end of the horizontal part 112 of the bearing platform beam 11 to form an end head part 113, burying the water stop member 12 when pouring the end head part 113, manufacturing the end head part 113 by adopting a concrete pouring mode for conveniently burying the water stop member 12, and fixing the water stop member 12;

building a brick mold 14 between the first-stage support pile 213 and the bearing platform beam 11, turning up the corresponding part of the waterproof extension section 2111 and erecting the part at the top of the brick mold 14 so as to be convenient for lapping in the second-stage construction of a bottom plate, backfilling mortar on the waterproof extension section 2111 between the brick mold 14 and the bearing platform beam 11 to form a connecting band 13, and embedding the slinger 1121 of the bearing platform beam 11 in the connecting band 13;

mortar is poured between the brick mould 14 and the first-stage support pile 213 to form a force transmission belt 15, so that the stress applied to the bearing platform beam 11 is transmitted to the first-stage support pile 213, and the back jacking force transmission is achieved;

when a second-stage bottom plate is to be constructed, the first-stage support piles 213, the force transmission belts 15, the connecting belts 13 and the brick molds 14 are removed, second-stage cushion layers are poured at positions corresponding to the cushion layers, so that the second-stage cushion layers and the cushion layers 16 are connected into a whole, the waterproof extension sections 2111 at the tops of the brick molds 14 are placed and laid on the corresponding second-stage cushion layers, second-stage waterproof layers are laid on the second-stage cushion layers and the waterproof extension sections 2111, and the second-stage waterproof layers and the waterproof extension sections 2111 are mutually lapped to meet construction specifications;

and anchoring the reinforcing steel bars on the secondary waterproof layer and the removed swing bars 1121 in the connecting band 13, and pouring the reinforcing steel bars to form a secondary bottom plate, so that the bottom plates with different heights are mutually connected by the connecting structure to realize the purpose of staged construction.

The invention also provides a construction method for constructing the connection structure of the unequal-height bottom plates in stages, which comprises the following steps:

when the first-stage base plate 21 is constructed, a part is reserved on one side, close to the second-stage base plate to be constructed, of the waterproof layer 211 laid at the bottom of the first-stage base plate 21 to form a waterproof extension section 2111;

pouring a cushion layer 16 on one side of the first-stage bottom plate 21 close to the second-stage bottom plate to be constructed, wherein the cushion layer 16 is positioned on the first-stage engineering pile 212, the end part of the cushion layer 16 is abutted against the first-stage support pile 213, and the waterproof extension section 2111 is laid on the cushion layer 16;

and concrete is poured on the waterproof extension 2111 to form a bearing platform beam 11 with one end anchored with the primary bottom plate 21;

a water stop piece 12 is embedded at the position of the bearing platform beam 11 corresponding to a second-stage bottom plate to be constructed;

building a brick mould 14 with a set distance from the bearing platform beam 11 on the cushion layer 16;

laying the part of the waterproof extension 2111 extending from the bottom of the cushion cap beam 11 along the cushion layer, turning upwards along the brick mold 14 and erecting the waterproof extension on the top of the brick mold 14;

the waterproof extension section 2111 between the brick mold 14 and the bearing platform beam 11 is backfilled with mortar to form a connecting belt 13 covering the water stop piece 12;

mortar is backfilled on the cushion layer 16 between the first-stage support pile 213 and the brick mold 14 to form a force transmission belt 15, so that the force applied to the connecting structure is transmitted to the first-stage support pile 213 to achieve the effect of back-jacking transmission, and the connecting structure is prevented from deforming.

Further, before the bearing platform beam 11 is poured, a sling 1121 is arranged in a pouring space of the bearing platform beam 11, and the sling 1121 partially extends out of a part, corresponding to a secondary bottom plate to be constructed, of the bearing platform beam 11 with pouring;

when the connection band 13 is poured, the protruding portion of the whippletion 1121 is embedded in the connection band 13.

The concrete operation mode of the construction method provided by the invention is as follows:

before constructing the first-stage bottom plate 21, a first-stage support pile 213 is arranged at a position close to the first-stage bottom plate 21 to be formed, first-stage engineering piles 212 are arranged around the first-stage bottom plate 21 to be formed, and when a waterproof extension section 2111 of the first-stage bottom plate 21 is laid, a part of the waterproof extension section 2111 is reserved to extend outwards from the end part of the first-stage bottom plate 21;

pouring a cushion layer 16 between the first-stage engineering pile 212 and the first-stage support pile 213, placing the waterproof extension section 2111 on the cushion layer 16, and further pouring a bearing platform beam 11 on the waterproof extension section 2111, so that one end of the bearing platform beam 11 is anchored with the first-stage bottom plate 21, and the other end of the bearing platform beam 11 is anchored with the first-stage engineering pile 212;

pouring concrete at the end of the horizontal part 112 of the bearing platform beam 11 to form an end head part 113, burying the water stop member 12 when pouring the end head part 113, manufacturing the end head part 113 by adopting a concrete pouring mode for conveniently burying the water stop member 12, and fixing the water stop member 12;

building a brick mold 14 between the first-stage support pile 213 and the bearing platform beam 11, turning up the corresponding part of the waterproof extension section 2111 and erecting the part at the top of the brick mold 14 so as to be convenient for lapping in the second-stage construction of a bottom plate, backfilling mortar on the waterproof extension section 2111 between the brick mold 14 and the bearing platform beam 11 to form a connecting band 13, and embedding the slinger 1121 of the bearing platform beam 11 in the connecting band 13;

mortar is poured between the brick mould 14 and the first-stage support pile 213 to form a force transmission belt 15, so that the stress applied to the bearing platform beam 11 is transmitted to the first-stage support pile 213, and the back jacking force transmission is achieved;

when a second-stage bottom plate is to be constructed, the first-stage support piles 213, the force transmission belts 15, the connecting belts 13 and the brick molds 14 are removed, second-stage cushion layers are poured at positions corresponding to the cushion layers, so that the second-stage cushion layers and the cushion layers 16 are connected into a whole, the waterproof extension sections 2111 at the tops of the brick molds 14 are placed and laid on the corresponding second-stage cushion layers, second-stage waterproof layers are laid on the second-stage cushion layers and the waterproof extension sections 2111, and the second-stage waterproof layers and the waterproof extension sections 2111 are mutually lapped to meet construction specifications;

and anchoring the reinforcing steel bars on the secondary waterproof layer and the removed swing bars 1121 in the connecting band 13, and pouring the reinforcing steel bars to form a secondary bottom plate, so that the bottom plates with different heights are mutually connected by the connecting structure to realize the purpose of staged construction.

While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.