Basement exterior wall structure under narrow space condition

Abstract

The utility model relates to the technical field of basement exterior wall waterproofing and structures, and discloses a basement exterior wall structure under a narrow space condition, a positioning guide block is constructed in the narrow space, and a groove is formed between the positioning guide block and a guide wall of a basement exterior wall; the batten is hoisted into the narrow space, and the lower end of the batten is inserted into the groove; a gap between the batten and the foundation pit support is filled, a single-side formwork is erected on the other side, away from the foundation pit support, of the batten, and concrete is poured. The waterproof layer is pre-laid on the batten, the waterproof layer forms a main body of the basement exterior wall waterproof structure, a base layer does not need to be leveled, structural members such as reinforcing steel bar heads and opposite-pull screws do not penetrate through waterproof coiled materials, and the waterproof construction quality can be controlled easily. On the basis, the residual space in the narrow space and the basement exterior wall concrete structure are independently filled, and the redundant thickness of the basement exterior wall structure is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of basement exterior wall waterproofing and structure, and in particular to a basement exterior wall structure under narrow space conditions. Background Art

[0002] In order to improve the utilization rate of urban construction land, when designing new buildings in the city center, the distance between the foundation pit support and the basement outer wall structure is often too close. When the gap between the foundation pit support and the basement outer wall is less than 0.5m, it is difficult for construction workers to carry out basement outer wall waterproofing and earth backfilling and compaction operations in such a small space.

[0003] Faced with this difficulty, the solution of relevant technologies is:

[0004] After the waterproof membrane is constructed on the supporting piles, the reinforcement is planted at a certain interval, the structural reinforcement of the basement exterior wall is tied, the formwork is set up, the waterstop screws are positioned and welded to the reinforcement heads, and the exterior wall concrete is poured.

[0005] Disadvantages of this solution:

[0006] 1. The surface flatness of the supporting pile facade is poor, and there are misalignments between the piles. When used as the base for laying waterproof membranes, it is necessary to chisel, hang mesh spray anchors or hang mesh plastering, which will take a lot of time, manpower and material resources; if the base is not handled well, the quality of laying waterproof membranes is difficult to control.

[0007] 2. In order to fix the external wall formwork system, it is necessary to plant reinforcement bars on the supporting piles. The steel bar heads will pass through the external wall waterproof membrane, and the large number of steel bar heads will cause more serious secondary damage to the waterproof membrane.

[0008] 3. The fertilizer trough between the support piles and the basement exterior wall is cast together with the exterior wall structure at one time. The thickness of the conventional basement exterior wall is 250mm-300mm. When the fertilizer trough is cast at one time, the actual thickness of the entire exterior wall reaches 750mm-800mm. If the overall thickness of the basement exterior wall is too large, on the one hand, the wall reinforcement ratio will not meet the standard requirements, and the plain concrete of the fertilizer trough part will be thick and easy to crack, which will affect the impermeability and durability of the overall exterior wall structure; on the other hand, a large amount of high-strength impermeability concrete is consumed, wasting resources. Utility Model Content

[0009] In order to solve the problems that it is difficult to control the laying quality of waterproof membrane when foundation pit support piles are used as the laying base of waterproof membrane, the manpower and time costs are high, the waterproof structure is easily damaged, and the overall structure of the basement outer wall is too thick when the fertilizer trough and the basement outer wall structure are cast at one time, the present application provides a basement outer wall structure under narrow space conditions.

[0010] The present application provides a basement exterior wall structure in a narrow space, which adopts the following technical solution:

[0011] A basement exterior wall structure under narrow space conditions includes a positioning guide block arranged in a narrow space between a foundation pit support and a basement exterior wall, a groove being formed between the positioning guide block and the guide wall; and a strip board inserted into the narrow space, the lower end of the strip board being inserted into the groove, a waterproof layer being pre-laid on the strip board; a single-sided formwork is set up on the side of the strip board away from the foundation pit support, a filling space for filling is formed between the strip board and the foundation pit support, and a casting space for casting is formed between the strip board and the single-sided formwork.

[0012] By adopting the above technical solution, when constructing the basement exterior wall, a strip is inserted into the narrow space between the foundation pit support and the basement exterior wall, and the filling space between one side of the strip and the foundation pit support is used for filling and forming, while a single-sided formwork is set up on the other side of the strip away from the foundation pit support to cast the main structure of the concrete basement exterior wall. In addition, because the strip itself is pre-laid with a waterproof layer, it is not necessary to use the foundation pit support piles to lay waterproof membranes and fix the concrete casting formwork, which effectively reduces the thickness of the casting space, meets the requirements of structural strength and stability for the construction of the main structure of the concrete basement exterior wall, and can also take into account the cost and the amount of production materials used, and can meet the waterproof and structural design requirements of the basement exterior wall construction.

[0013] Preferably, the upper end of the strip is fixedly connected to the top pressure beam with a clamp, the clamp includes a connector inserted into a preset hole on the top pressure beam, the connector is connected to a connecting piece, the connecting piece extends toward the direction of the strip, and the connecting piece is fixed to the upper end of the strip with a locking piece.

[0014] By adopting the above technical solution, the connector of the clamp is inserted into the hole pre-opened on the top beam, and then the connecting piece and the upper end of the strip are fixed by the locking piece, so as to achieve a stable connection between the upper end of the strip and the top beam, which has good operability and connection stability.

[0015] Preferably, the waterproof layer is configured as a waterproof membrane, the waterproof membrane of the basement floor is turned up to the groove through the gap between the pedestal and the foundation pit support and overlapped at the guide wall, and the waterproof layer is overlapped on the turned-up waterproof membrane of the basement floor.

[0016] By adopting the above technical scheme, the basement floor's own waterproof membrane is extended to the lower end of the strip board, which can effectively improve the waterproof effect of the lower end of the strip board at the groove position, and the basement floor's own waterproof membrane and the strip board's waterproof membrane cooperate to form a composite waterproof structure, further improving the waterproof effect.

[0017] Preferably, the waterproof layer is pre-laid on the side of the strip board away from the foundation pit support, and the lower end of the waterproof membrane of the strip board is overlapped on the waterproof membrane at the guide wall.

[0018] By adopting the above technical solution, the waterproof membrane of the basement floor and the waterproof membrane of the strip board cooperate to form a composite waterproof structure at the lower end of the strip board, further improving the waterproof effect of the lower end of the strip board near the guide wall in the groove.

[0019] Preferably, the upper end of the waterproofing membrane of the strip is turned outward and fixed to the strip, and the upper end of the waterproofing membrane of the strip extends to cover the top of the filling structure at the filling space.

[0020] By adopting the above technical solution, the fixing stability of the waterproof membrane can be improved, and the waterproof effect at the upper end of the strip can be effectively improved, thereby improving the waterproof effect at the top of the filling position, and then improving the overall waterproof effect of the basement exterior wall structure.

[0021] Preferably, the waterproof layer is overlapped with the waterproof membrane of the basement floor to form a lower-end overlapping waterproof structure, and a waterproof protective layer is laid on the lower-end overlapping waterproof structure.

[0022] By adopting the above technical solution, the waterproof protective layer plays a role in protecting the lower overlapping waterproof structure formed after overlapping, and can also play a role in supporting and stabilizing the strips to a certain extent.

[0023] Preferably, the strips are configured as plain concrete slabs, and reinforcement members are inserted into or pre-embedded in the strips.

[0024] By adopting the above technical solution, reinforcing members are placed in the slats, and even if the slats are accidentally broken during the construction process, it will not cause a large deviation phenomenon.

[0025] Preferably, the side of the strip board facing away from the foundation pit support is tied with structural reinforcement of the basement outer wall and an outer wall formwork wall is erected on one side, and the casting space is formed between the strip board and the outer wall formwork wall.

[0026] By adopting the above technical solution, the side of the strip board away from the foundation pit support can be used as the exterior wall formwork wall on one side of the casting formwork. It is only necessary to build the exterior wall formwork wall on the other side, thus forming a single-sided formwork casting structure, which is beneficial to improving the integrity of the concrete exterior wall waterproof structure and the main structure, and is also beneficial to simplifying the construction process.

[0027] Preferably, when the basement roof is higher than the top beam, a double-sided formwork is set up above the single-sided formwork, and the double-sided formwork is used for casting and molding to obtain the raised portion of the basement outer wall.

[0028] By adopting the above technical solution, for the part of the basement outer wall that is higher than the top beam, the traditional double-sided formwork casting structure can still be constructed on the basis of the single-sided formwork casting structure, which has good construction adaptability and flexibility.

[0029] Preferably, the height of the positioning guide block is designed to be 300mm-350mm, and the width of the groove is designed to be 100mm-120mm.

[0030] By adopting the above technical solution, during actual construction, the height range of the positioning guide block and the width range of the groove are specifically limited, thereby improving the construction convenience and construction effect while meeting the basic design requirements.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. Insert strips into the narrow space between the foundation pit support piles and the basement exterior wall. The waterproofing membrane is pre-processed with the strips to form an integral structure. The waterproofing membrane pre-laid on the strips constitutes the main body of the basement exterior wall waterproofing structure. There is no need to level the base, and there will be no structural parts such as steel bar heads and tension screws passing through the waterproofing membrane, which is conducive to controlling the quality of waterproofing construction. On this basis, fill the remaining space in the narrow space and cast the concrete structure of the basement exterior wall, reducing the redundant thickness of the basement exterior wall structure, meeting the requirements of the concrete basement exterior wall main structure construction for structural strength and stability, and taking into account the cost and the amount of production materials used, and meeting the waterproofing and structural design requirements of the basement exterior wall construction;

[0033] 2. The waterproofing membrane of the basement floor and the waterproofing membrane of the strip board are overlapped and arranged at the lower end of the strip board, and on this basis, a waterproof protective layer is laid; at the same time, the upper end of the waterproofing membrane of the strip board is turned outward and fixedly connected to the upper end of the strip board and then extended to cover the top of the filling structure. By optimizing the waterproofing structure at the upper and lower ends of the strip board, the overall waterproofing effect of the basement exterior wall is improved;

[0034] 3. By inserting reinforcement pieces in the strips and connecting the upper ends of the fixed strips with the tops of the supporting pile pressure beams, the structural stability of the partition structure formed by the strips during the construction process is comprehensively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is mainly used to show the structural schematic diagram of the foundation pit support and basement exterior wall in this application;

[0036] Figure 2 It is a schematic diagram mainly used to show the foundation pit support structure;

[0037] Figure 3 It is a schematic structural diagram of the basement exterior wall structure under narrow space conditions in an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram mainly used to show the strip structure, the F-shaped steel bar head and the strip connection structure;

[0039] Figure 5 It is a schematic diagram mainly used to show the relationship between the strip board, the basement outer wall and the foundation pit support structure after the construction of the embodiment of the present application;

[0040] Figure 6 yes Figure 3 The enlarged schematic diagram of the middle A part;

[0041] Figure 7 It is a schematic diagram mainly used to show the connection structure between the upper end of the strip board and the top beam;

[0042] Figure 8 It is a schematic diagram of the structure of the clamp in the embodiment of the present application.

[0043] Explanation of the reference numerals in the accompanying drawings: 01, channel-cut concrete continuous wall; 02, supporting piles; 03, capping beam; 04, bottom plate; 05, pedestal; 06, guide wall; 07, narrow space; 08, waterproofing membrane of basement bottom plate; 09, exterior wall of basement after casting; 11, strip board; 111, reinforcement; 12, waterproof layer; 2, positioning guide block; 3, groove; 4, waterproof protective layer; 51, L-shaped steel bar head; 52, F-shaped steel bar head; 53, clamp; 531, plug-in; 532, connecting piece; 533, locking piece; 534, plug interface; 6, single-sided formwork; 61, exterior wall formwork wall; 62, triangular bracket; 71, double-sided formwork; 72, water-stop tension screw; 8, filling space; 9, casting space. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-8 This application is described in further detail.

[0045] The embodiment of the present application discloses a basement exterior wall structure in a narrow space.

[0046] Combination Figure 1 and Figure 2 As shown, Figure 1 It is mainly used to show the structural diagram of the foundation pit support and basement exterior wall structure in this application. Figure 2The flowchart of the process steps of the basement outer wall construction method under narrow space conditions in the embodiment of the present application is shown in FIG. The foundation pit support in the present application adopts a row pile support structure system, which includes a plurality of groups of foundation pit support piles 02 arranged in a row along the height direction of the basement outer wall. The support piles 02 in the present application are bored cast-in-place piles, and the top of the support piles 02 is constructed with a capping beam 03 parallel to the reference plane. One side of the support piles 02 is a channel-cut concrete continuous wall 01, and the other side of the support piles 02 cooperates with the basement structure to form a narrow space 07. The basement structure includes a basement cap 05 and a bottom plate 04, which are integrally cast and formed and located on one side of the foundation pit support. The top surface of the cap 05 is cast and formed with a vertically arranged guide wall 06, and a gap with a very small width is formed between the cap 05 and the support piles 02 of the foundation pit support, and the narrow space 07 between the guide wall 06 and the support piles 02 is less than 0.5 m wide.

[0047] Example 1

[0048] Reference Figure 3 As shown, Figure 3 The schematic diagram of the structure of the basement with the outer wall of the basement under the condition of narrow space. The waterproofing membrane 08 of the basement floor goes around the bottom of the cap 05, and then turns up to the position of the guide wall 06 through the gap between the cap 05 and the support pile 02, and is bonded and fixed. The positioning guide block 2 is constructed in the narrow space 07 between the support pile 02 and the guide wall 06. The positioning guide block 2 is constructed on the waterproofing membrane of the basement floor 04 after turning up by bricklaying tongue and groove method or template casting concrete method, and the positioning guide block 2 is arranged in the narrow space 07 along the pre-designed direction of the basement outer wall, so that a groove 3 is formed between the positioning guide block 2 and the position of the guide wall 06. The strip board 11 is inserted into the narrow space 07 perpendicular to the reference plane, and the lower end of the strip board 11 is vertically inserted into the groove 3, and the upper end of the strip board 11 is fixedly connected to the top end of the pressure beam 03, so that a filling space 8 is formed between the strip board 11 and the supporting pile 02, and a single-sided formwork 6 is erected on the other side of the strip board 11 away from the supporting pile 02 through a triangular bracket 62, and the strip board 11 cooperates with the outer wall formwork wall 61 of the single-sided formwork 6 to form a casting space 9.

[0049] Reference Figure 4 As shown, Figure 4 The schematic diagram is mainly used to show the strip board structure, the F-shaped steel bar head and the strip board connection structure. The strip board 11 in the embodiment of the present application is a square plate-shaped concrete member obtained by processing plain concrete, and the length direction of the concrete member is arranged along the preset height direction of the basement outer wall.

[0050] Holes are drilled along the length direction of the strip 11, and reinforcing members 111 are inserted into the holes. In the embodiment of the present application, steel pipes are used as the reinforcing members 111. Of course, the reinforcing members 111 can also be pre-buried in the formwork when forming the concrete component, so that the reinforcing members 111 and the concrete are integrally formed to form an integral structure.

[0051] Combination Figure 3 and Figure 5 As shown, Figure 5 It is a schematic diagram mainly used to show the relationship between the strips, basement exterior walls and foundation pit support structure after the construction of the embodiment of the present application. It should be noted that a waterproof layer 12 needs to be pre-laid on the strips 11. In the embodiment of the present application, a waterproof roll is used as the waterproof layer 12. A hot-melt adhesive waterproof roll can be used, or a non-hot-melt self-adhesive waterproof roll can be used. Conventional waterproof rolls can also be self-bonded by adhesives. However, no matter which of the above methods is used to pre-lay the waterproof roll on the strips 11, it is necessary to form a bonding surface on the side of the waterproof roll facing away from the strips 11. In the subsequent construction link of pouring the single-sided formwork 6, the construction purpose of the basement exterior wall 09 after pouring and forming and the waterproof roll naturally adhering to form an integral structure can be achieved.

[0052] In addition, the upper and lower ends of the waterproof membrane pre-laid on the strip board 11 need to extend beyond the ends of the strip board 11, leaving some excess waterproof membrane to facilitate the construction of the waterproof structure at the upper and lower ends of the strip board 11 in the subsequent construction phase. The specific excess value can be adaptively adjusted according to design requirements and on-site construction conditions.

[0053] In the embodiment of the present application, the preset height range of the positioning guide block 2 is 300mm-350mm, and the preset width range of the groove 3 is 100mm-120mm. The specific numerical selection can be adaptively adjusted according to design requirements and actual construction conditions.

[0054] Combination Figure 3 and Figure 6 As shown, Figure 6 for Figure 3 The enlarged schematic diagram of the middle A part. Before constructing the positioning guide block 2, the waterproofing membrane 08 of the basement floor needs to be turned up and around the bottom of the pedestal 05. The turned-up waterproofing membrane is connected to the position of the guide wall 06 through the gap between the support pile 02 and the pedestal 05, and then glued and fixed to the bottom surface of the narrow space 07. That is, the positioning guide block 2 is actually constructed on the waterproofing membrane in the narrow space 07.

[0055] The strip 11 is carried into the narrow space 07 by hoisting, and the lower end of the strip 11 is inserted into the groove 3 perpendicular to the reference plane, and the side of the strip 11 pre-laid with waterproof membrane is oriented away from the foundation pit support. During the hoisting process, the waterproof membrane protruding from the lower end of the strip 11 needs to be overlapped on the waterproof membrane that has been guided and fixed at the position of the guide wall 06, and then the waterproof protective layer 4 is laid on the overlapped two parts of the waterproof membrane. In the embodiment of the present application, the two parts of the waterproof membrane at the lower end of the strip 11 are pressed by laying 50mm thick bricks on the overlapped waterproof membrane.

[0056] Moreover, in the process of continuously inserting the strips 11 into the grooves 3, it is necessary to divide the construction sections into several sections with the post-cast strips of the basement outer wall as the boundary. Both ends of each construction section need to construct a head structure between the strips 11 and the corresponding supporting piles 02, and the joints of adjacent strips 11 need to be hung with fiberglass mesh cloth and covered with anti-cracking mortar.

[0057] Combination Figure 3 and Figure 7 As shown, Figure 7 It is a schematic diagram mainly used to show the connection structure between the upper end of the strip and the top beam. After completing the construction of the waterproof structure at the lower end of the strip 11, it is necessary to adjust the verticality of the strip 11. The strip 11 can be kept perpendicular to the reference plane as much as possible by adjusting the posture of the strip 11 by a crane, measuring with a level ruler and manually fine-tuning the posture of the strip 11, and then the upper end of the strip 11 is fixedly connected to the top beam 03. In the embodiment of the present application, the upper end of the strip 11 is fixed by welding the steel bar head to the steel bar head embedded in the top beam 03. Specifically, the upper end of the strip 11 is pre-embedded or post-punched with an F-shaped steel bar head 52, and the top beam 03 is pre-embedded with an L-shaped steel bar head 51, and the F-shaped steel bar head 52 is welded and fixed to the L-shaped steel bar head 51.

[0058] Reference Figure 3 As shown, the embodiment of the present application uses low-grade concrete to fill the filling space 8 between the strip board 11 and the support pile 02, and backfills in layers at a certain interval. The layer height is selected according to national standards and design requirements, and vibrates to form. Of course, you can also choose to fill self-compacting fluidized solidified soil instead of low-grade concrete, but you still need to backfill in layers at a certain interval and vibrate to form. Under normal circumstances, the backfill height each time should not exceed 1.5m, and the interval between two adjacent backfills should be more than 24h.

[0059] The excess waterproof membrane at the upper end of the strip board 11 is turned outward toward one side of the top beam 03 and fixed to the upper end of the strip board 11. The excess waterproof membrane and the upper end of the strip board 11 can be fixedly connected by means of the hot-melt bonding or self-adhesive properties of the waterproof membrane, or by subsequently applying adhesive to achieve fixed connection between the two, thereby completing the construction of the waterproof structure at the upper end of the strip board 11.

[0060] Reference Figure 3 As shown, a single-sided formwork 6 is set up on the side of the strip 11 away from the foundation pit support, and then concrete is poured to form it. Finally, the single-sided formwork 6 is removed to obtain the concrete basement exterior wall. Specifically, on the side of the strip 11 away from the foundation pit support, the structural steel bars of the basement exterior wall are tied, and the exterior wall formwork wall 61 is set up on the other side of the structural steel bars relative to the strip 11, and then concrete is poured between the strip 11 and the exterior wall formwork wall 61 and vibrated to form it; wherein the exterior wall formwork wall 61 can be supported and fixed by a triangular bracket 62. In addition, in the preparation stage of the strip 11 and the construction stage of hoisting the strip 11 and fixing the lower end of the strip 11, the reverse-adhesive waterproof membrane is pre-laid, and the bonding surface of the waterproof membrane faces the exterior wall formwork wall 61, so the reverse-adhesive waterproof membrane can be naturally bonded with the concrete poured in the single-sided formwork 6 to form an integral structure.

[0061] It should be noted that the basement exterior wall structure corresponding to the narrow space 07 adopts the concrete pouring construction method of erecting a single-sided formwork 6, and when the height of the basement top plate is higher than the height of the top beam 03, a conventional formwork support system can be erected above the single-sided formwork 6 obtained by erecting the strip board 11 and the exterior wall formwork wall 61, and concrete is poured into the conventional formwork support system, and vibrated to form the part of the basement exterior wall that is higher than the top beam 03.

[0062] Conventional formwork support system, that is, the double-sided formwork 71 is fixed by water-stop tension screws 72.

[0063] Example 2

[0064] Reference Figure 8 As shown, Figure 8 Schematic diagram of the structure of the clamp in the embodiment of the present application. The difference between the embodiment of the present application and embodiment 1 is that the connection structure between the upper end of the strip and the top beam is different. In the embodiment of the present application, the upper end of the strip 11 is fixedly connected to the top of the top beam 03 through the clamp 53 for basement exterior wall construction. Specifically, the clamp 53 includes a plug-in 531 inserted into a preset hole on the top beam 03, the plug-in 531 is connected to a connecting piece 532, the connecting piece 532 is extended in the direction of the strip 11, and the connecting piece 532 is plugged and fixed to the upper end of the strip 11 with a locking piece 533.

[0065] In the embodiment of the present application, holes are reserved on the top pressure beam 03 using PVC pipes at a certain interval. The steel pipe used as the connector 531 is inserted into the reserved holes in the direction perpendicular to the reference plane, and the horizontally arranged steel plate is used as the connecting piece 532 and is welded to the steel pipe. One end of the steel plate is welded to the steel pipe, and the other end of the steel plate is overlapped on the upper end surface of the strip 11, and a plug-in port 534 is provided on the steel plate. A metal pin is used as a locking piece 533. The metal pin is inserted into the plug-in port 534 and driven into the upper end surface of the strip 11, or driven into the preset hole on the upper end surface of the strip 11, thereby achieving the purpose of the clamp 53 connecting and fixing the strip 11 and the top pressure beam 03.

[0066] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A basement exterior wall structure in a narrow space, characterized by: The invention comprises a positioning guide block (2) arranged in a narrow space (07) between a foundation pit support and an outer wall of a basement, a groove (3) being formed between the positioning guide block (2) and the guide wall (06); a strip board (11) inserted into the narrow space (07), the lower end of the strip board (11) being inserted into the groove (3), a waterproof layer (12) being pre-laid on the strip board (11); a single-sided formwork (6) being arranged on a side of the strip board (11) away from the foundation pit support, a filling space (8) for filling being formed between the strip board (11) and the foundation pit support, and a pouring space (9) for pouring being formed between the strip board (11) and the single-sided formwork (6).

2. The basement exterior wall structure in a narrow space according to claim 1, characterized in that: The upper end of the strip (11) is fixedly connected to the top pressure beam (03) by a clamp (53), the clamp (53) comprises a plug-in component (531) inserted into a preset hole on the top pressure beam (03), the plug-in component (531) is connected to a connecting component (532), the connecting component (532) is extended in the direction of the strip (11), and a locking component (533) is inserted and fixed to the upper end of the strip (11).

3. The basement exterior wall structure in a narrow space according to claim 1, characterized in that: The waterproof layer (12) is configured as a waterproof roll material, and the waterproof roll material (08) of the basement floor is turned up through the gap between the cap (05) and the foundation pit support to the groove (3) and overlapped at the guide wall (06), and the waterproof layer (12) is overlapped on the waterproof roll material (08) of the basement floor after being turned up.

4. The basement exterior wall structure in a narrow space according to claim 3, characterized in that: The waterproof layer (12) is pre-laid on the side of the strip board (11) away from the foundation pit support, and the lower end of the waterproof roll of the strip board (11) is overlapped on the waterproof roll at the guide wall (06).

5. The basement exterior wall structure in a narrow space according to claim 3 or 4, characterized in that: The upper end of the waterproof roll of the strip board (11) is turned outward and fixed to the strip board (11), and the upper end of the waterproof roll of the strip board (11) extends to cover the top of the filling structure at the filling space (8).

6. The basement exterior wall structure in a narrow space according to claim 3, characterized in that: The waterproof layer (12) is overlapped with the waterproof roll material (08) of the basement floor to form a lower overlap waterproof structure, and a waterproof protective layer (4) is laid on the lower overlap waterproof structure.

7. The basement exterior wall structure in a narrow space according to claim 1, characterized in that: The strip board (11) is configured as a plain concrete board, and a reinforcement member (111) is inserted into or pre-buried in the strip board (11).

8. The basement exterior wall structure in a narrow space according to claim 1, characterized in that: The side of the strip board (11) facing away from the foundation pit support is tied with structural steel bars of the basement outer wall and an outer wall formwork wall (61) is erected on one side, and the casting space (9) is formed between the strip board (11) and the outer wall formwork wall (61).

9. The basement exterior wall structure in a narrow space according to claim 8, characterized in that: When the basement roof is higher than the top beam (03), a double-sided formwork (71) is arranged above the single-sided formwork (6), and the double-sided formwork (71) is used for casting and molding to obtain the raised portion of the basement exterior wall.

10. The basement exterior wall structure in a narrow space according to claim 1, characterized in that: The height of the positioning guide block (2) is designed to be 300 mm-350 mm, and the width of the groove (3) is designed to be 100 mm-120 mm.

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